Method for regenerating blade rubber and method for producing regenerated blade rubber

Abstract

In a method for regenerating a blade rubber for use in a wiper blade, at least a portion of the blade rubber constitutes a contact portion with an object to be wiped, and the regeneration method includes a step of preparing the blade rubber to be regenerated, and a cutting step of removing at least a portion of the contact portion by causing the cutting blade to enter the blade rubber from a side portion of the blade rubber at one end A of the blade rubber, and moving the cutting blade relative to the blade rubber toward the other end B of the blade rubber, wherein the storage elastic modulus at a vibration frequency of 1 * 103 Hz of the blade rubber is 90.0 to 500.0 MPa, and the fracture stress of the blade rubber is 4.2 to 30.0 MPa.

Description

Technical Field

[0001] The present disclosure relates to a method for regenerating blade rubber used in scraper blades for cleaning the surface (wiped surface) of an object to be wiped, such as a windshield of a vehicle such as an automobile, railway vehicle, aircraft, or ship (hereinafter referred to as a "vehicle"), and in scraper blades for cleaning the protective glass surface of a lens assembly or imaging device such as a webcam. The present disclosure also relates to a method for producing the regenerated blade rubber. Background Art

[0002] In the blade rubber of a vehicle's wiper blade, the contact portion at the tip that comes into contact with the windshield gradually wears out due to long-term use, resulting in uneven wiping, etc. Patent Document 1 discloses a regeneration cutter that regenerates the blade rubber tip of a wiper blade whose wiping performance has deteriorated due to long-term use by cutting off the blade rubber tip.

[0003] Prior art literature

[0004] Patent Literature

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2006-174980 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] The present inventors regenerated a commercially available soft blade rubber made of natural rubber by using a cutter for scraper blade regeneration according to Patent Document 1. As a result, the wiping performance of the regenerated blade rubber was unsatisfactory.

[0008] At least one aspect of the present disclosure is to provide a method for regenerating scraper blade rubber, which can regenerate a scraper blade having deteriorated wiping performance to have improved wiping performance. Furthermore, at least one aspect of the present disclosure is to provide a method for producing regenerated scraper blade rubber, which exhibits wiping performance as good as that of new scraper blade rubber.

[0009] Solutions for solving problems

[0010] According to at least one aspect of the present disclosure, a method for regenerating a scraper blade rubber of a scraper blade may be provided.

[0011] At least a portion of the scraper rubber forms a contact portion with the object to be wiped.

[0012] The regeneration method comprises:

[0013] Preparing blade rubber for recycling; and

[0014] The cutting blade is inserted into the scraper rubber from the side of the scraper rubber at one end A of the scraper rubber, and the cutting blade is moved relative to the scraper rubber toward the other end B of the scraper rubber to remove at least a portion of the contact portion, wherein

[0015] The vibration frequency measured in an environment at a temperature of 24° C. by using a sample sampled from the blade rubber so as to include at least a portion of the contact portion is 1×10 3 The storage elastic modulus at Hz is 90.0 to 500.0 MPa, and

[0016] The fracture stress of the sample measured in an environment with a temperature of 24° C. was 4.2 to 30.0 MPa.

[0017] According to at least one aspect of the present disclosure, a method for manufacturing recycled scraper rubber may be provided.

[0018] The manufacturing method comprises:

[0019] A blade rubber regenerated by the above-mentioned blade rubber regeneration method is obtained.

[0020] Effects of the Invention

[0021] According to at least one aspect of the present disclosure, a blade rubber regeneration method capable of restoring the cleaning performance of a wiper blade having deteriorated wiping performance may be provided.

[0022] Furthermore, according to at least one aspect of the present disclosure, a method of manufacturing a regenerated blade rubber that exhibits cleaning performance equivalent to initial cleaning performance may be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] [ Figure 1 ] is a diagram for explaining the deformation of the top end portion of the scraper rubber due to the entry of the blade portion.

[0024] [ Figure 2 ] is a diagram for explaining the deformation of the top end portion of the scraper rubber having high hardness due to the entry of the blade portion.

[0025] [ Figure 3 ] is a schematic diagram of the scraper blade and scraper rubber.

[0026] [ Figure 4 ] is a diagram for illustrating an example of steps in the regeneration method.

[0027] [ Figure 5 ] is a schematic diagram of an example of a scraper rubber regeneration device.

[0028] [ Figure 6 ] is a schematic diagram for illustrating an example of a cutting unit.

[0029] [ Figure 7 ] is a schematic diagram for explaining an example of a cutting unit and a clamping member.

[0030] [ Figure 8 ] is a schematic diagram for illustrating an example of a clamping member.

[0031] [ Figure 9 ] is a schematic diagram for illustrating an example of a pressing member.

[0032] [ Figure 10 ] is a schematic diagram for illustrating an example of a biasing member.

[0033] [ Figure 11 ] is a diagram for explaining the macroscopic shape of the lip after conventional scraper rubber regeneration.

[0034] [ Figure 12 ] is a schematic diagram showing a further enlargement of the area around the top of the blade portion and the lip portion.

[0035] [ Figure 13 ] is an illustration of the biasing component.

[0036] [ Figure 14 ] is an illustration of the biasing component.

[0037] [ Figure 15 ] is an illustration of the wiping test in the embodiment.

[0038] [ Figure 16 ] is an explanatory diagram of the evaluation method of the regenerated scraper rubber in the embodiment. DETAILED DESCRIPTION

[0039] In the present disclosure, unless otherwise specified, the term "from XX to YY" or "XX to YY" when expressing a numerical range means that the numerical range includes the lower limit and the upper limit as endpoints. When describing a numerical range in sections, the upper and lower limits of each numerical range can be combined as needed. In addition, in the present disclosure, for example, a description such as "at least one selected from the group consisting of XX, YY, and ZZ" means any one of XX, YY, ZZ, a combination of XX and YY, a combination of XX and ZZ, a combination of YY and ZZ, or a combination of XX, YY, and ZZ. When XX is a group, multiple members can be selected from XX, and the same applies to YY and ZZ.

[0040] Hereinafter, embodiments for implementing the present disclosure will be specifically exemplified with reference to the accompanying drawings. However, it should be understood that the size, material, shape, and relative arrangement of the components described in the embodiments are intended to be appropriately changed according to the composition and various conditions of the components to which the present disclosure is applied. In other words, the scope of the present disclosure is not intended to be limited to the embodiments described below. In addition, in the following description, components having the same function are represented by the same reference numerals in the drawings, and their descriptions may be omitted.

[0041] The present inventors investigated why the wiping performance of regenerated scraper rubber, obtained by regenerating commercially available soft scraper rubber using a regeneration cutter according to Patent Document 1, did not reach that of a new scraper blade. First, the inventors carefully observed the cut surface of the regenerated scraper rubber. As a result, the inventors discovered that a wavy, zigzag pattern was generated on the cut surface of the regenerated scraper blade. Hereinafter, this wavy, zigzag pattern appearing on the cut surface may also be referred to as a "vibration pattern" or "chatter mark."

[0042] Therefore, the present inventors have carefully observed the microscopic behavior of the blade portion and the scraper rubber during the regeneration process when a commercially available scraper rubber is regenerated using the regeneration cutter according to Patent Document 1. Specifically, first, the blade portion 101 of the regeneration cutter is brought into contact with the side surface of one end of the cutting target portion of the scraper rubber 103 (see FIG. Figure 1 1A). Then, the blade portion is made to enter the scraper rubber. At this time, the side of the cutting target portion, that is, the portion of the scraper rubber entered by the blade portion, has been seen. Due to the pressure of the blade portion when entering, Figure 1 As shown in 1B, a large elastic deformation occurs, and then the scraper rubber breaks while cutting.

[0043] The present inventors have found that, in the process of advancing the blade portion from one end side to the other end side of the scraper rubber, the elastic deformation and fracture of the scraper rubber are repeated, thereby generating a vibration shape ( Figure 1 1C). It is considered that in the recycled blade rubber in which a vibration shape is generated on the cutting surface, the contact with the surface of the cleaning object becomes uneven, thereby generating wiping unevenness on the surface of the wiping object. In order to make the blade rubber exhibit high wiping performance, for example, Figure 3In the cross-sectional view perpendicular to the longitudinal direction of the blade rubber shown in FIG3A, it is considered important that the edges 8 and 9 of the blade rubber uniformly contact the surface of the object being wiped along the longitudinal direction of the blade rubber. However, in the case of a regenerated blade rubber in which a vibrating shape is generated on the cut surface, it is considered that the vibrating shape causes the edges to unevenly contact the surface of the object being wiped along the longitudinal direction of the blade rubber, resulting in uneven wiping on the surface of the object being wiped.

[0044] Based on such considerations, the inventors realized that when regenerating the scraper rubber, in order to prevent the shape of the cut surface from being disturbed and to obtain a regenerated scraper rubber with excellent wiping performance, it is extremely important to prevent the scraper rubber from being deformed when the blade portion enters and to prevent the scraper rubber from repeatedly elastically deforming and breaking as the blade portion moves.

[0045] Based on this understanding, the inventors conducted further research. In the research process, the inventors first studied how to increase the hardness of the scraper rubber to suppress the deformation of the scraper rubber when the blade portion enters. Figure 2 As shown in FIG2A, the blade portion 101 of the regeneration cutter is brought into contact with the side of the cutting target portion of the scraper rubber 201 having increased hardness, and then the blade portion 101 is inserted into the scraper rubber. As a result, due to the high hardness of the scraper rubber 201, Figure 2 As shown in FIG2B , the elastic deformation of the blade rubber is suppressed when the blade portion enters. However, it has been confirmed that, during the subsequent advancement of the blade portion, an excessive load is applied to the blade rubber until the blade rubber breaks, and the advancing direction of the blade portion 101 becomes unstable, and the cutting surface 203 may have a vibration shape that is disturbed in a wave shape at a shorter pitch than in the case where the hardness of the blade rubber is low ( Figure 2 2C). This regenerated scraper rubber with a vibrating shape also makes uneven contact with the surface of the cleaning object, which may cause uneven wiping.

[0046] Based on these analysis results, it was discovered that, in order to obtain recycled scraper blade rubber that exhibits the same excellent wiping performance as a new scraper blade, a scraper rubber having physical properties that hardly deforms when the blade portion enters and does not hinder the smooth travel of the blade portion is effective in obtaining recycled scraper rubber that exhibits the same excellent wiping performance as a new scraper blade. As a result of further research based on this understanding, it was discovered that when the storage elastic modulus and fracture stress of the scraper rubber to be cut are set within predetermined ranges, the shape of the cut surface is not disturbed, which facilitates the production of recycled scraper blades that exhibit the same excellent wiping performance as a new scraper blade.

[0047] <Detailed Analysis of Cutting Phenomenon>

[0048] The present inventors have discovered that, for example, a blade rubber and a scraper blade using the same according to the aspects described below can suppress elastic deformation of the blade rubber when a regenerating blade portion enters, thereby suppressing the load upon breaking. As a result, it has been found that the cut surface can be prevented from having a disturbed shape, and the cleaning performance of the regenerated blade rubber can be made comparable to that of new blade rubber. Therefore, the blade rubber can be reused, promoting the efficient use of resources.

[0049] As described above, in the process of bringing the blade portion into contact with the scraper rubber and causing the blade portion to enter the scraper rubber, the blade portion collides with the scraper rubber and advances through the deformation and breakage of the scraper rubber by the blade portion. Therefore, the inventors have found that the deformation ability of the scraper rubber with respect to stress generated in a very short time (such as the collision of the blade portion) is important, and when high-frequency vibration is applied, the deformation ability is correlated with the elastic modulus. In addition, in the case of evaluating the frequency dependence of the elastic modulus in general scraper rubbers, as higher-frequency vibration is applied, the scale of the vibrating structure becomes smaller, and the value of the elastic modulus tends to be high. From these results, the inventors found that by increasing the deformation ability of the scraper rubber as an indicator of the deformation ability when the blade portion enters at 1×10 3 By setting the storage elastic modulus at Hz within a predetermined range, deformation of the blade rubber when the blade portion enters can be stably suppressed.

[0050] Specifically, in an environment with a temperature of 24°C, when the vibration frequency of the sample taken from the blade rubber is set to 1×10 3 The storage modulus of elasticity at Hz (hereinafter also referred to as "E'") is 90.0 to 500.0 MPa. By setting E' within this numerical range, the blade portion can enter the side of the blade rubber without applying excessive pressure to the blade portion, and deformation of the blade rubber during entry can be suppressed. The storage modulus of elasticity E' is preferably 100.0 to 400.0 MPa, and more preferably 134.0 to 400.0 MPa.

[0051] In addition, the inventor has observed in detail the blade rubber when the blade portion advances in the blade rubber when cutting a blade rubber made of natural rubber. As a result, it was confirmed that the blade rubber locally extends and deforms as the blade portion advances, and then the blade rubber breaks and is cut.

[0052] In other words, it is believed that the repeated extension and subsequent fracture of the blade rubber as the blade moves forward disrupts the shape of the cut surface. Based on these considerations, the inventors conducted further research and found that adjusting the fracture stress of the blade rubber to be regenerated within a predetermined range contributes to the smooth movement of the blade.

[0053] Specifically, by setting the blade rubber's fracture stress within a range of 4.2 to 30.0 MPa, stable blade movement can be achieved. A fracture stress of 4.2 MPa or greater prevents the blade rubber from breaking before the blade advances. Furthermore, a fracture stress of 30.0 MPa or less prevents disturbances in the blade's advancing direction caused by increased load applied to the blade as it advances within the blade rubber. The blade rubber's fracture stress is preferably between 8.0 and 28.0 MPa, more preferably between 10.0 and 25.0 MPa.

[0054] As described above, it is preferable that the blade rubber satisfies the following characteristics i) and ii) to suppress the cut surface of the regenerated blade rubber from having a vibrating shape and to make the cleaning performance of the regenerated blade rubber comparable to that of a new blade rubber.

[0055] Feature i) A sample is taken from the scraper rubber to include at least a portion of the contact portion, and the sample is shaken in an environment of 24° C. at a vibration frequency of 1×10 3 The storage elastic modulus at Hz is 90.0 to 500.0 MPa (preferably 100.0 to 400.0 MPa).

[0056] Feature ii) The breaking stress of the sample is 4.2 to 30.0 MPa (preferably 8.0 to 28.0 MPa).

[0057] In the case of conventional blade rubber designed to increase E', the fracture stress tends to increase accordingly. Therefore, it is difficult to set both E' and fracture stress within the above ranges. That is, in the case of a blade rubber with a small E', such as Figure 1 1A to Figure 1 As shown in 1C, when the blade portion enters, the scraper rubber is deformed and the shape of the blade portion entering the scraper portion is disturbed. On the other hand, when the E' of the scraper rubber is large, the fracture stress increases accordingly, the load applied to the blade portion becomes too large, and the forward direction of the blade portion becomes unstable, as shown in FIG. Figure 2 As a result, in either case, the cut surface will become uneven.

[0058] On the other hand, in a blade rubber that satisfies the above-mentioned characteristics i) and ii), deformation of the blade portion during entry is suppressed, and the load applied to the blade portion as it advances through the blade rubber during cutting is less likely to be excessive. As a result, it is believed that the generation of a vibrating shape on the cut surface is suppressed.

[0059] A specific configuration of the blade rubber capable of setting both E′ and the breaking stress, which are characteristics of the present disclosure, within the above-mentioned ranges will be described below.

[0060] <Scraper Rubber>

[0061] The material having a specific E' and breaking stress is not particularly limited, and in particular, the blade rubber preferably comprises polyurethane, preferably a polyurethane elastomer.

[0062] Polyurethane is mainly obtained from raw materials such as polyols, chain extenders, polyisocyanates, catalysts and other additives. Polyurethane is composed of hard segments and soft segments. The hard segment is usually composed of a chain extender containing polyisocyanates and short-chain diols. For example, it refers to the aggregated crystalline component of the urethane bond, the cyanate bond (nurate bond), and the component with low molecular mobility at and near the crosslinking point. On the other hand, the soft segment is usually composed of long-chain polyols such as polyester polyols, polyether polyols or polycarbonate polyols and polyisocyanates. For example, it refers to the segment between the crosslinking point and the crosslinking point.

[0063] To set the storage modulus E' and fracture stress within the above ranges, it is preferred that the hard and soft segments in the polyurethane be finely and evenly dispersed. If the distribution of the hard and soft segments is uneven, the deformation caused by the entry of the blade may increase the mobility of some components, and the load during the entry of the blade may increase the mobility of some components. As a result, the entry of the blade becomes unstable and vibration occurs. Therefore, it is difficult to achieve both the storage modulus and fracture stress according to the present disclosure within the above ranges.

[0064] Conventional polyurethanes have relatively large hard segments in which urethane bonds aggregate through interaction, further agglomerating. To improve mechanical strength, such as storage modulus, relatively large hard segment aggregates are typically formed. According to the inventors' research, scraper rubbers produced using such polyurethanes, as disclosed herein, cannot simultaneously meet the above-mentioned storage modulus and fracture stress requirements.

[0065] In addition, in the high frequency region, for example, 1×10 3 At vibration frequencies of 100 Hz, the hard segments of the polyurethane have relatively low molecular mobility and cannot move fully. Therefore, it is believed that the storage elastic modulus E' in the high-frequency region is primarily determined by the movement of the soft segments, which have relatively high molecular mobility. Since the relaxation time is shortened in the higher frequency region, the movement of the soft segments is also restricted. As a result, the polymer as a whole cannot move fully, and the elastic modulus increases rapidly. Therefore, for the elastic modulus in the high-frequency region, controlling the molecular mobility of the soft segments is more effective than controlling the molecular mobility of the hard segments.

[0066] That is, as the molecular mobility of the soft segment becomes greater, E' decreases, while as the molecular mobility of the soft segment becomes smaller, E' increases. For the polyurethane in the blade rubber according to one aspect of the present disclosure, it is effective to reduce the molecular mobility of the soft segment to set the storage elastic modulus E' within the above range.

[0067] For example, the molecular mobility of the soft segment can be reduced by introducing at least one of a branched structure (three-dimensional structure) into the molecular structure of the polyurethane and shortening the distance between crosslinks. By introducing a branched structure and shortening the distance between crosslinks, the molecular mobility of the soft segment can be reduced, thereby increasing the storage modulus in the high-frequency region.

[0068] Furthermore, the introduction of a branched structure and the shortening of the distance between crosslinks can suppress crystallization caused by stacking of soft segments and further prevent the aggregation of hard segments. As a result, the formation of giant hard segments due to aggregation in the polyurethane is suppressed, which also contributes to the fine and uniform dispersion of the hard segments.

[0069] As an example, a polyurethane in which a hard segment is finely and uniformly dispersed will be described. However, the constituent material of the blade rubber according to the present disclosure is not limited to these polyurethanes.

[0070] For example, a cured product of a urethane raw material mixture containing a diisocyanate or a trifunctional or higher polyfunctional isocyanate, and a diol or a trifunctional or higher polyfunctional alcohol within an appropriate concentration range has a branched structure in the molecular structure of the polyurethane, and the aggregation of the hard segments is suppressed, so that a polyurethane in which the hard segments are finely and uniformly dispersed can be obtained.

[0071] Specifically, for example, it is preferred to use at least one of an alcohol containing a trifunctional or higher polyfunctional alcohol and an isocyanate compound containing a trifunctional or higher polyfunctional isocyanate as the carbamate raw material. It is also preferred to use an alcohol containing at least one selected from diols and trifunctional or higher polyfunctional alcohols and an isocyanate compound containing a trifunctional or higher polyfunctional isocyanate as the carbamate raw material. It is also preferred to use an alcohol containing a trifunctional or higher polyfunctional alcohol and an isocyanate compound containing a diisocyanate and a trifunctional or higher polyfunctional isocyanate as the carbamate raw material. In particular, it is preferred to use a trifunctional or higher polyfunctional isocyanate and a trifunctional or higher polyfunctional alcohol as the carbamate raw material.

[0072] For example, the polyurethane is preferably a reaction product of a polyurethane raw material mixture comprising an isocyanate compound containing 4,4'-MDI, a polyester polyol, and a trifunctional or higher polyfunctional alcohol. The polyurethane elastomer is more preferably a reaction product of a polyurethane raw material mixture comprising an isocyanate compound containing a trifunctional or higher polyfunctional isocyanate and 4,4'-MDI, a polyester polyol, and a trifunctional or higher polyfunctional alcohol.

[0073] In a polyurethane that is a reaction product of a polyurethane raw material mixture containing a trifunctional or higher polyfunctional isocyanate and a trifunctional or higher polyfunctional alcohol, molecular orientation is suppressed by steric hindrance, and aggregation of hard segments is more reliably suppressed. Furthermore, since the molecular mobility of the soft segments is also reduced, the polyurethane is suitable for achieving the storage elastic modulus E' and breaking stress according to the present disclosure.

[0074] In addition, when the soft segment portion has, for example, a linear alkylene structure, the crystallinity is increased by stacking the soft segments. As a result, the hard segments are less likely to disperse. Therefore, in order to suppress the aggregation of the hard segments, it is also effective to introduce an alkylene structure having a side chain portion into the soft segment portion. Specifically, for example, the substructure represented by the following structural formulas (i) to (iv) is introduced into the soft segment portion between two urethane bonds, which is effective for the miniaturization of the hard segments.

[0075] -CH2-CH(CH3)-CH2-CH2-O-(i)

[0076] -CH2-CH2-CH(CH3)-CH2-O-(ii)

[0077] -CH2-CH(CH3)-O-(iii)

[0078] -CH(CH3)-CH2-O-(iv)

[0079] The structures of structural formula (i) and (ii) are structures produced by the ring-opening polymerization of 3-methyltetrahydrofuran, and are substantially the same. The structures of structural formula (iii) and (iv) are structures produced by the ring-opening polymerization of 1,2-propylene oxide, and are substantially the same. By reacting a polyether polyol or polyester polyol with isocyanate having these structures, a polyurethane having this structure between two adjacent urethane bonds is obtained. Here, when difunctional alcohols (glycols) and difunctional isocyanates (diisocyanates) are used as polyurethane raw materials, it is generally difficult to finely disperse the hard segments. However, by introducing the above-mentioned substructures into the soft segment part, even when glycols and diisocyanates are used as polyurethane raw materials, the hard segments can also be finely dispersed. As a result, it is possible to obtain a polyurethane that satisfies the parameters of the scraper rubber according to the present disclosure.

[0080] In addition to introducing side chains into the soft segments, another method for suppressing crystallization caused by stacking of the soft segments and preventing aggregation of the hard segments can be exemplified by using two or more alcohols having different numbers of carbon atoms in their linear moieties as the polyurethane raw material. In polyurethanes obtained by using two or more alcohols having different numbers of carbon atoms in their linear moieties, even if the soft segments have linear alkylene structures, the different numbers of carbon atoms can suppress crystallization caused by stacking of the soft segments. Furthermore, since the soft segments have different numbers of carbon atoms, aggregation of the urethane bonds can be suppressed, thereby preventing aggregation of the hard segments.

[0081] Therefore, even when diols and diisocyanates having a linear alkylene structure in the molecule are used as polyurethane raw materials, the hard segment can be miniaturized by using a variety of diols having different carbon atoms in the linear alkylene structure as diols. As a result, a polyurethane that provides a scraper rubber that meets the parameters of the present disclosure can be obtained. The maximum value of the difference in the number of carbon atoms in the linear portion of the two or more alcohols is, for example, preferably less than 6, more preferably less than 4. Preferably, a long-chain polyol, such as a polyester polyol, a polyether polyol or a polycarbonate polyol, contains two or more alcohols with different numbers of carbon atoms in the linear portion. More specifically, examples of multiple diols include, for example, a combination of polybutylene adipate polyester polyol and polyhexane adipate polyester polyol. Examples of the alcohol include the following: polyester polyols such as polyethylene adipate polyester polyol, polybutylene adipate polyester polyol, polyhexane adipate polyester polyol, (polyethylene / polypropylene) adipate polyester polyol, (polyethylene / polybutylene) adipate polyester polyol, (polyethylene / polyneopentylene) adipate polyester polyol; polycaprolactone-based polyols obtained by ring-opening polymerization of caprolactone; polyether polyols such as polyethylene glycol, polypropylene glycol and polytetramethylene ether glycol; and polycarbonate diol. These may be used alone or in combination of two or more.

[0082] In addition, as described above, it is preferable to use two or more polyols having different numbers of carbon atoms in the linear portion (alkylene chain) as the alcohol because a urethane in which the crystallization of the soft segment is suppressed and the aggregation of the hard segment is suppressed can be obtained. In this case, for example, it is preferable to use at least two selected from the group consisting of polyester polyols such as polyethylene adipate polyester polyol, polybutylene adipate polyester polyol, polyhexane adipate polyester polyol, poly(ethylene glycol / propylene glycol) adipate polyester polyol, poly(ethylene glycol / butylene glycol) adipate polyester polyol, and poly(ethylene glycol / neopentyl glycol) adipate polyester polyol.

[0083] The content of trifunctional or higher polyfunctional isocyanates in the polyurethane components is preferably 8 to 30% by mass, more preferably 12 to 20% by mass. However, it is important to satisfy the storage modulus E' and breaking stress, and it is not necessary to use trifunctional or higher polyfunctional isocyanates. The content of polyols such as polyester polyols in the polyurethane components is preferably 50 to 80% by mass, more preferably 55 to 70% by mass.

[0084] The content ratio of the trifunctional or higher polyfunctional alcohol in the constituent components of the polyurethane is preferably from 1 to 15% by mass, more preferably from 2 to 10% by mass.

[0085] Diols or trifunctional or higher-functional alcohols that can extend the molecular chain of polyurethane can also be used as chain extenders.

[0086] Examples of the diols include the following.

[0087] Ethylene glycol (EG), diethylene glycol (DEG), propylene glycol (PG), dipropylene glycol (DPG), 1,4-butanediol (1,4-BD), 1,6-hexanediol (1,6-HD), 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, xylylene glycol (terephthalyl alcohol), and triethylene glycol. These can be used alone or in combination of two or more.

[0088] Examples of trifunctional or higher polyfunctional alcohols include trimethylolpropane (TMP), glycerol, pentaerythritol, and sorbitol. These may be used alone or in combination of two or more.

[0089] One method for improving the storage modulus of polyurethane is to introduce a three-dimensional crosslinked structure. Introducing a three-dimensional crosslinked structure is preferred from the perspective of setting the E' and fracture stress according to the present disclosure within the above-mentioned ranges. As a method for introducing a three-dimensional crosslinked structure, for example, a trifunctional or higher polyfunctional alcohol is preferably used as a chain extender. Furthermore, introducing a branched structure into the polyurethane using a trifunctional or higher polyfunctional alcohol can inhibit polyurethane crystallization and further suppress the aggregation of hard segments.

[0090] Here, as a polyfunctional alcohol, from the viewpoint of suppressing the excessive increase in hardness caused by the excessively high crosslinking degree of the polyurethane, it is preferred to use a trifunctional alcohol. Among the trifunctional alcohols, a triol having a methylene skeleton adjacent to a hydroxyl group and capable of having a crosslinked structure with a soft molecular structure is preferred because the triol has the effect of further suppressing the crystallinity of the hard segment. Examples of such triols include, for example, trimethylolpropane (TMP) and glycerol. Among the triols, TMP is particularly preferably used.

[0091] Examples of the isocyanate compound include the following compounds.

[0092] 4,4'-diphenylmethane diisocyanate (4,4'-MDI), polymeric MDI, 2,4-toluene diisocyanate (2,4-TDI), 2,6-toluene diisocyanate (2,6-TDI), xylene diisocyanate (XDI), 1,5-naphthalene diisocyanate (1,5-NDI), p-phenylene diisocyanate (PPDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 4,4'-dicyclohexylmethane diisocyanate (hydrogenated MDI), tetramethylxylene diisocyanate (TMXDI), carbodiimide-modified MDI, triphenylmethane-4,4',4"-triisocyanate (TTI), tris(phenylisocyanate)phosphorothioate (TPTI).

[0093] Among the isocyanate compounds exemplified above, 4,4'-MDI, in which both isocyanate groups have equal reactivity, is preferred. Furthermore, it is preferred to use a trifunctional or higher polyfunctional isocyanate in combination. By using a trifunctional or higher polyfunctional isocyanate, a branched structure can be introduced into the polyurethane, effectively further suppressing the aggregation of hard segments. Furthermore, since a denser cross-linked structure can be introduced into the polyurethane, a polyurethane having a storage modulus and a breaking stress according to the present disclosure can be obtained.

[0094] The content ratio of the isocyanate compound (diisocyanate) other than trifunctional or higher polyfunctional isocyanate in the constituent components of the polyurethane elastomer is preferably 5 to 40% by mass, more preferably 10 to 35% by mass.

[0095] Examples of trifunctional or higher polyfunctional isocyanates include at least one selected from the group consisting of triphenylmethane-4,4',4"-triisocyanate (TTI), tris(phenylisocyanate)phosphorothioate (TPTI), and polymeric MDI. Among them, tris(phenylisocyanate)phosphorothioate (TPTI) and polymeric MDI can be more suitably used. These isocyanates have a methylene group or an ether group between multiple NCO groups and can appropriately maintain the distance between multiple urethane bonds. Therefore, it is beneficial to suppress the aggregation of the hard segment.

[0096] Here, polymeric MDI is represented by the following chemical formula (1) and chemical formula (1)'. n in chemical formula (1)' is preferably 1 to 4. Chemical formula (1) is a case where n in chemical formula (1)' is 1.

[0097] [Chemical Formula 1]

[0098]

[0099] In the case where the polyurethane in the blade rubber according to the present disclosure is a cured product of a polyurethane raw material mixture including an isocyanate compound including diisocyanate and tri- or higher-functional isocyanate and an alcohol including tri- or higher-functional alcohol, the blade rubber preferably has the following physical properties.

[0100] A sample (polyurethane) sampled from the tip of the blade rubber was heated to 1000°C at a heating rate of 10°C / second using a direct sample introduction mass spectrometer, which ionizes the sample molecules by heating and vaporizing them in an ionization chamber. The detected amount of all ions obtained as a result was set as M1, and the integrated intensity of the peak in the extracted ion thermogram corresponding to the range of m / z values derived from trifunctional or higher polyfunctional isocyanates was set as M2. In this case, M2 / M1 is preferably 0.0010 to 0.0150, more preferably 0.0020 to 0.015, and even more preferably 0.0100 to 0.0145.

[0101] In addition, when the integrated intensity of the peak of the extracted ion thermogram corresponding to the range of m / z values derived from diisocyanate is set to M3, M3 / M1 is preferably 0.0200 to 0.1100, particularly preferably 0.0360 to 0.0900, and further preferably 0.0380 to 0.0760. When M2 / M1 and M3 / M1 are within the above ranges, a structure derived from a trifunctional or higher polyfunctional isocyanate with low crystallinity is appropriately introduced into the polyurethane elastomer in the scraper rubber. As a result, in the polyurethane, the aggregation of the hard segments is suppressed, and the hard segments are more finely and evenly dispersed. In addition, the excessive development of the cross-linked structure in the polyurethane is suppressed, and the storage elastic modulus E' and the fracture stress can be more easily adjusted to fall within the ranges of 90.0 to 500.0 MPa and 4.2 to 30.0, respectively.

[0102] Furthermore, M2 / M3 is preferably 0.0130 to 0.5000, more preferably 0.1000 to 0.4000, and even more preferably 0.1000 to 0.3000. M2 / M3 is a parameter representing the ratio between the diisocyanate moiety and the tri- or higher-functional isocyanate moiety of the polyurethane isocyanate. By setting M2 / M3 within this range, an excessive increase in the elastic modulus of the polyurethane can be suppressed, and aggregation of hard segments in the polyurethane can be further suppressed.

[0103] Here, in the case where the polyurethane in the blade rubber according to one aspect of the present disclosure is a polyurethane produced by using a polymer MDI represented by the chemical formula (1)' which is a trifunctional or higher polyfunctional isocyanate as one of the raw materials, in the extracted ion thermogram obtained by the above-mentioned mass spectrometry, the sum of the integrated intensities of the peaks of the extracted ion thermogram corresponding to the range of 380.5 to 381.5 in which the m / z value derived from n=1, the range of 511.5 to 512.5 in which the m / z value derived from n=2, the range of 642.5 to 643.5 in which the m / z value derived from n=3, and the range of 773.5 to 774.5 in which the m / z value derived from n=4 in the structure represented by the chemical formula (1)' only needs to be set as M2.

[0104] In addition, in the case where the polyurethane in the blade rubber according to one aspect of the present disclosure is a polyurethane produced by using diphenylmethane diisocyanate (4,4′-MDI) represented by the following chemical formula (2) as a difunctional isocyanate (diisocyanate) as one of the raw materials, in the extracted ion thermogram obtained by the above-mentioned mass spectrometry, the integrated intensity of the peak corresponding to the range of m / z values of 249.5 to 250.5 derived from the structure represented by the chemical formula (2) only needs to be set to M3.

[0105] [Chemical Formula 2]

[0106]

[0107] In addition, when the polyurethane in the scraper rubber according to the present invention is a reaction product of a raw material composition including an alcohol containing a trifunctional or higher polyfunctional alcohol, particularly when a polyfunctional isocyanate is used in combination so that M2 / M1 is 0.0010 to 0.0150, the polyurethane preferably has the following physical properties. That is, a sample taken from the polyurethane is measured by pyrolysis GCMS (gas chromatography and mass spectrometry). In this case, the concentration of the component derived from the trifunctional or higher polyfunctional alcohol in the polyurethane is preferably 0.04 mmol / g to 0.39 mmol / g, more preferably 0.14 mmol / g to 0.39 mmol / g, and further preferably 0.18 mmol / g to 0.39 mmol / g. When the concentration of the component derived from the trifunctional or higher polyfunctional alcohol is 0.04 mmol / g or more, the aggregation of the hard segments can be more reliably suppressed. In addition, when the concentration of the component derived from a trifunctional or higher polyfunctional alcohol is 0.39 mmol / g or less, excessive development of the crosslinked structure in the polyurethane can be suppressed, and the storage elastic modulus can be prevented from becoming too high. Note that the concentration of the component derived from a trifunctional or higher polyfunctional alcohol in the polyurethane is calculated by the following formula (2).

[0108] Formula (2): Concentration of components derived from trifunctional or higher polyfunctional alcohols (mmol / g) =

[0109] [Amount of component derived from trifunctional or higher polyfunctional alcohol (g) / molecular weight of component derived from trifunctional or higher polyfunctional alcohol × 1000] / [mass of polyurethane (g)]

[0110] In addition, as another aspect of providing a polyurethane elastomer that satisfies the storage modulus and breaking stress according to the present invention, a cured product of a polyurethane raw material mixture containing almost no polyfunctional isocyanate, specifically, wherein M2 / M1 is less than 0.0010, and containing trimethylolpropane (TMP) as a crosslinking component and a diisocyanate such as diphenylmethane diisocyanate (MDI) can be exemplified. Here, examples of diphenylmethane diisocyanate include the above-mentioned 4,4'-MDI.

[0111] Because TMP has a methylene backbone adjacent to a hydroxyl group, it can provide a polyurethane having a three-dimensional cross-linked structure with a flexible molecular structure. The cross-linked structure derived from TMP is flexible and can form a branched structure through cross-linking. Therefore, the amount of polyfunctional isocyanate used can be reduced, and by primarily using TMP, excessive rigidity can be suppressed, and cross-linking can be introduced at a higher density. By introducing the three-dimensional cross-linked structure derived from TMP at a high density, the cross-linking density is increased, and due to the steric hindrance of the cross-linked structure derived from TMP, the soft segment portions present between the cross-linked structures are less likely to interact with each other. As a result, the formation of a crystalline structure due to the interaction between the soft segments, i.e., the formation of hard segments, can be prevented.

[0112] In addition, homogenizing the length of the soft segment is effective for preventing the aggregation of hard segments derived from urethane bonds. For polyurethanes with a short distance between crosslinking points and uniform length between crosslinking points, for example, it is preferred that the number average molecular weight of the prepolymer as the polyurethane raw material is set in the range of 8000 to 120,000, and chain extenders such as 1,4-butanediol are not used as much as possible. In particular, it is preferred that 1,4-butanediol is not used at all. It is preferred that 1,4-butanediol is not used because it is easy to form a crystalline structure. As described above, providing an elastomeric polyurethane that meets the storage elastic modulus E' and fracture stress according to the present disclosure can be produced without using multifunctional isocyanates such as polymer MDI as raw materials. In particular, in the case of desiring to obtain a blade rubber having a lower storage elastic modulus E' within the range according to the present disclosure (90.0 to 500.0 MPa), it is effective to use a polyurethane into which a three-dimensional crosslinked structure derived from TMP is introduced while suppressing the amount of polyfunctional isocyanates such as polymeric MDI or not using polyfunctional isocyanates such as polymeric MDI.

[0113] In the polyurethane according to another aspect, the concentration of the component derived from trifunctional or higher polyfunctional alcohol in the polyurethane is preferably set to 0.30 to 0.70 mmol / g, more preferably 0.40 to 0.61 mmol / g, further preferably 0.50 to 0.60 mmol / g.

[0114] In the polyurethane according to another aspect, M2 / M1 is preferably as small as possible, more preferably 0.0008 or less. The lower limit of M2 / M1 is not particularly limited, but is preferably 0.0000 or greater. That is, in the polyurethane according to another aspect, M2 / M1 is preferably 0.0000 or greater and less than 0.0010, particularly preferably 0.0000 to 0.0008. In addition, the concentration of the component derived from trifunctional or higher polyfunctional alcohol in the polyurethane is preferably 0.30 to 0.70 mmol / g, particularly preferably 0.40 to 0.61 mmol / g, and further preferably 0.50 to 0.60 mmol / g.

[0115] Furthermore, in the polyurethane according to another aspect, M3 / M1 is preferably 0.0900 to 0.2000, particularly preferably 0.0950 to 0.1300.

[0116] The polyurethane raw material may contain a catalyst for promoting the reaction of the isocyanate compound and the alcohol. As the catalyst, a common catalyst for curing polyurethane can be used, examples of which include tertiary amine catalysts and tertiary amino alcohols. Specifically, the following catalysts can be exemplified.

[0117] Amino alcohols such as dimethylethanolamine, N,N,N'-trimethylaminopropylethanolamine and N,N'-dimethylhexanolamine; trialkylamines such as triethylamine; and tetraalkyldiamines such as N,N,N'N'-tetramethyl-1,3-butanediamine; as well as triethylenediamine, piperazine compounds and triazine compounds.

[0118] Examples of tertiary amino alcohols include 2-(dimethylamino)ethanol, 3-(dimethylamino)propanol, 2-(dimethylamino)-1-methylpropanol, 2-{2-(dimethylamino)ethoxy}ethanol, 2-{2-(diethylamino)ethoxy}ethanol, and 2-[{2-(dimethylamino)ethyl}methylamino]ethanol.

[0119] In addition, organic acid salts of metals, such as potassium acetate and basic potassium octoate, can also be used. In addition, metal catalysts commonly used for carbamate formation, such as dibutyltin dilaurate, can also be used. These can be used alone or in combination of two or more.

[0120] As the raw material for forming the blade rubber, additives such as pigments, plasticizers, water repellents, antioxidants, ultraviolet absorbers, light stabilizers, and hydrolysis inhibitors may be blended as needed within a range that does not affect the regeneration of the blade rubber.

[0121] <Structure of the scraper blade>

[0122] The scraper blade can be used to wipe objects such as vehicles, typically automobiles, transportation vehicles such as airplanes and ships, and industrial machinery such as construction machinery. These transportation vehicles and industrial machinery are hereinafter collectively referred to as vehicles. The scraper device can be applied to the windshield of a vehicle. Windshields are not limited to front windows, but also include side windows and rear windows.

[0123] The wiper blade can also be used as a wiper blade for wiping a lens device or a protective glass surface of an imaging device of a web camera, etc. A wiper blade for a windshield of a vehicle will be described as an example, but the wiper blade is not limited thereto.

[0124] <Scraping device>

[0125] For example, Figure 3 As shown in FIG3A , the scraping device includes a scraper arm 300 and a scraper blade 110 mounted to the scraper arm 300. The scraper arm 300 is associated with, for example, a drive motor (not shown). The scraper blade 110 includes a scraper rubber 100 and a scraper support 210 as a supporting member for supporting the scraper rubber 110. Figure 3 In addition to the sequential branching type shown in FIG3A , the scraper support 210 may also adopt various known types of supporting members, such as a flat type.

[0126] like Figure 3 As shown in FIG3B , the scraper rubber 100 includes a base 1 and a lip 3. The base 1 connects the scraper rubber 100 to the scraper support 210, and the lip 3 is pivotally connected to the base 1 via a neck 2. The scraper blade has a substantially uniform cross-sectional shape along its length. At least a portion of the tip of the scraper rubber forms the contact portion with the object being wiped.

[0127] In a cross-section perpendicular to the longitudinal direction of the scraper rubber, the lip 3 includes a shoulder extending from the end of the lip 3 on the neck 2 side to the side of the neck. Furthermore, the lip 3 may include a tapered portion 4 whose width gradually decreases from the side closer to the base 1 toward the direction away from the base 1 to stabilize the contact posture of the scraper rubber. Furthermore, the degree of gradual decrease in the width of the tapered portion 4 may vary gradually. For example, the lip 3 may include a lip top portion in which the degree of gradual decrease in the width of the tapered portion decreases toward the side closer to the top away from the base 1 of the lip. Furthermore, the lip top portion may include a portion having the same or substantially the same width from the side closer to the base 1 toward the top. Figure 3 The blade rubber shown in FIG3B has a plate-shaped portion continuous with the tapered portion 4 on the tip side of the lip portion 3 .

[0128] The scraping device cleans the surface of a target member by bringing at least a portion of the tip of the lip 3 into contact with the surface of a windshield, which is represented by a glass surface. Consequently, at least a portion of the tip of the lip 3 forms the contact portion with the windshield. The contact portion of the lip 3 is formed to extend in the longitudinal direction of the scraper rubber.

[0129] For example, the width of the neck portion 2 may be narrowed relative to the base portion 1 and the lip portion 3 in a cross section perpendicular to the longitudinal direction of the blade rubber. In addition, for example, the lip portion may be an elastic body. As a result, Figure 3 As shown in FIG3C , the lip 3 is inclined in the wiping direction, and at least a portion of the lip 3 is brought into contact with the surface of the member to be cleaned.

[0130] like Figure 3As shown in FIG3B , the lip portion 3 has a first side surface 5 continuous from the tapered portion 4 and a second side surface 6 opposite to the first side surface 5. In addition, the lip portion 3 includes the first side surface 5 and the second side surface 6, and a top end surface 7 constituting a first edge 8 and a second edge 9, which serves as the top end side edge of the lip portion 3 on the side farthest from the base portion 1.

[0131] At least a portion of the contact portion processed by the regeneration method according to the present disclosure is a portion of the tip of the lip 3 , and is a portion including at least the tip surface 7 .

[0132] <Method for Regenerating Blade Rubber / Method for Manufacturing Regenerated Blade Rubber>

[0133] In the case of using a scraper blade comprising a scraper rubber, reference will be made to Figure 4 4A to 4C describe a method for regenerating used scraper rubber and a method for producing regenerated scraper rubber according to the present disclosure. The method for regenerating scraper rubber and the method for producing regenerated scraper rubber include the steps of regenerating used scraper rubber whose cleaning performance (wiping performance) has deteriorated due to use and restoring the cleaning performance. Note that the method for regenerating used scraper rubber and the method for producing regenerated scraper rubber may be referred to as "scraper rubber regeneration method, etc." hereinafter.

[0134] As a step of preparing the blade rubber to be recycled, a used blade rubber is prepared. For example, a scraper blade equipped with the used blade rubber can be used for recycling as it is, or the blade rubber can be removed from the scraper blade and recycled.

[0135] like Figure 4 As shown in FIG4A , due to friction with the wiping object surface, the used scraper rubber may have a notch 141 or wear 142 in the contact area. Therefore, due to the notch 141 and wear 142, the wiping performance may be deteriorated. Figure 4 4B, including the top end of the contact area of the blade rubber is cut into a predetermined length (dashed line portion 143). In the cutting step, it is preferred to cut the top end of the lip 3 to obtain a cutting surface substantially parallel to the top end surface 7.

[0136] One aspect of a method for regenerating a scraper rubber, etc., includes a cutting step: inserting a cutting blade into the scraper rubber from the side of the scraper rubber at one end A of the scraper rubber (for example, one end in the length direction), and moving the cutting blade relative to the scraper rubber toward the other end B of the scraper rubber to remove at least a portion of the contact portion. The length used for cutting only needs to be a length that reliably cuts the notch or worn portion, and the cutting length is preferably shortened so that it can be recycled and used multiple times. Multiple recycling and use is preferred because it can further promote the effective use of resources. The cutting conditions, including the cutting length, will be described in detail later.

[0137] like Figure 4 As shown in Figure 4C, in the scraper rubber (recycled scraper rubber), the tip portion (lip tip portion) of the scraper rubber, which is the contact portion with the object to be wiped, is removed by a cutting step. The notches and worn portions are removed by the cutting step. As a result, the accuracy of the contact area with the object to be cleaned is restored to a level equivalent to that of new scraper rubber, and a scraper rubber with no deterioration in wiping performance compared to new scraper rubber can be obtained.

[0138] Furthermore, by repeating the above-mentioned regeneration method and the like, the blade rubber can be regenerated multiple times.

[0139] As one aspect of the scraper rubber recycling method, etc. according to the present disclosure, there is preferably a method comprising at least the following steps: clamping at least a portion of the scraper rubber, inserting a cutting blade into the scraper rubber from the side of the tip of the scraper rubber at end A, which is one end of the scraper rubber, and then relatively moving the cutting blade toward the other end B of the scraper rubber to cut the tip of the scraper rubber. The method of clamping the scraper rubber is not particularly limited, as long as the scraper rubber is stably pressed against the entry of the cutting blade. Preferably, the portion close to the cutting blade is clamped to improve the stability of the scraper rubber when the cutting blade enters the scraper rubber.

[0140] The direction in which the cutting blade enters and moves within the scraper rubber is not particularly limited and can be longitudinal or transverse. To achieve the shape accuracy of the edge portion that affects cleaning performance, it is preferred that the blade portion move in a longitudinal direction perpendicular to the edge portion to remove the contact portion with the cleaning target component. In other words, the relative movement is preferably along the longitudinal direction of the scraper rubber. For example, the cutting blade preferably moves to cut the first edge 8, the second edge 9, and the top surface 7. In other words, at least a portion of the contact portion to be removed preferably includes the top surface and the top side edge of the scraper rubber.

[0141] One aspect of a regeneration device that can be used in the regeneration method according to the above aspect, etc., exemplifies a regeneration device that includes

[0142] As a blade portion of a cutting blade, at least a portion of the contact portion is removed in the length direction,

[0143] The clamping member of the scraper rubber,

[0144] a biasing member that contacts end B of the blade rubber and biases the blade rubber in the direction of end A, and

[0145] A pressing member presses a tip end of the contact portion including the blade rubber in a longitudinal direction of the blade rubber to suppress elastic deformation due to movement of the blade portion.

[0146] The clamping member clamps at least a portion of the scraper rubber from both sides of the scraper rubber in a cross-section perpendicular to the longitudinal direction of the scraper rubber. Furthermore, the clamping member is positioned so as to clamp at least a portion of the scraper rubber's blade portion, and the position of the clamping member relative to the scraper rubber is fixed. Before the blade portion moves relative to end A to end B, the pressing member presses the scraper rubber.

[0147] In order to more reliably prevent the generation of a vibration shape on the cutting surface and obtain a regenerated scraper rubber having wiping performance equivalent to that of a new scraper rubber, it is preferred to regenerate the scraper rubber according to the present disclosure in which E' and breaking stress are optimized as described above into a scraper rubber by using the above-mentioned regeneration device 20.

[0148] Will refer to Figure 5 、 Figure 6 6A and 6B and Figure 7 7A and 7B are used to describe the regeneration device. Figure 5 Schematic diagram showing the appearance of a blade rubber regeneration device 20 . Figure 6 6A and 6B are schematic diagrams for describing the cutting unit 30 including the blade portion and the cutting movement. Figure 7 7A is a cross-sectional view of the cutting unit 30 and the clamping member 21 along the transverse direction of the scraper rubber. Figure 7 7B is an enlarged view of the vicinity of the blade portion 31 .

[0149] The blade rubber regeneration device 20 includes a blade portion 31 as a cutting blade and a clamping member 21 as a blade rubber fixing member that fixes the blade rubber 100 .

[0150] The clamping member 2121 fixes the scraper rubber by clamping the scraper rubber from the lateral direction of the scraper rubber. In order to improve the stability of the scraper rubber when the blade portion 31 enters the scraper rubber, it is preferable to clamp the portion close to the blade portion. Therefore, for example, the clamping member 21 preferably clamps the lip portion 3. Specifically, for example, Figure 3 As shown in FIG3B, the clamping member 21 preferably clamps the first side surface 5 and the second side surface 6 of the lip 3. Here, the clamping member 21 clamps the lip 3 from both sides of the lip 3 in a cross-sectional view perpendicular to the longitudinal direction of the blade rubber. Figure 5 In the embodiment, the clamping member 21 is fixed to the flat plate 16 via the holding member 15 having an L-shaped cross section in the length direction of the blade rubber according to the present disclosure.

[0151] like Figure 6 6A and 6B and Figure 7 As shown in FIG7A and FIG7B , the clamping member 21 is arranged at a position where it can clamp at least a portion (end portion A) where the blade portion 31 enters the lip portion 3. Figure 6 In FIG6B , the clamping members 21 clamp the entire area of the lip 3 in the longitudinal direction from both sides, including the portion where the blade 31 enters. The position of the clamping members 21 relative to the blade rubber is fixed.

[0152] The blade rubber regeneration device 20 includes a blade portion 31 for cutting the tip of the lip portion 3 as at least a part of the contact portion in the longitudinal direction of the blade rubber 100. For example, Figure 5 and Figure 6 As shown in FIG6A and FIG6B , the scraper rubber regeneration device 20 may include a cutting unit 30, and the cutting unit 30 may include a blade portion 31 ( Figure 5 not shown).

[0153] The cutting unit 30 can move along the scraper rubber 100. There is no limitation on the moving direction, but it is preferably moved in the longitudinal direction because the cutting force can be increased by reducing the contact area between the scraper rubber and the blade portion, and the cutting surface is highly accurate. Figure 5 In the embodiment, the cutting unit 30 can move along the guide track 17. For example, the cutting unit 30 can be moved by Figure 5 The handle 32 in the figure is manually moved, but it can also be driven by an electric cylinder or a motor, etc. instead of manual drive. Note that the cutting unit 30 and the clamping member 21 may not contact each other, so that the cutting unit 30 is easy to move.

[0154] Figure 6 6A and 6B are cross-sectional views of the top portion of the cutting unit 30 in the blade rubber regeneration device 20 . Figure 6 6A is an enlarged view of the area around the cutting unit 30. Figure 6 6B is an overall view including the clamping member 21. The cutting unit 30 including the blade portion 31 moves along the longitudinal direction of the blade rubber 100 in the direction of the arrow in the figure from the end A toward the end B.

[0155] The blade portion 31 enters the lip 3 from the side of the top end of the lip 3 at the end A, which is one end in the length direction of the scraper rubber 100, and moves relatively toward the end B, which is the other end in the length direction, to cut a portion of the tip of the lip 3. By cutting in this manner, the worn and deteriorated portion can be removed to obtain a recycled scraper rubber.

[0156] Although the regenerating device 20 shown has an aspect in which the blade portion 31 (cutting unit 30) moves, it is sufficient that the blade portion 31 can relatively move from the end portion A to the end portion B. That is, it may be made such that the cutting unit 30 including the blade portion 31 is fixed and the clamping member 21 to which the blade rubber 100 is fixed moves. In addition, as Figure 6As shown in FIG6B , the regeneration device 20 preferably includes a biasing member 41 that contacts the side of the top end of the lip 3 at the end B of the lip 3 and biases the lip in the direction of the end A.

[0157] The biasing member 41 is, for example, a plate-shaped member and is inserted into the gap between the clamping members 21. The biasing member 41 presses the end B of the lip portion from the end of the clamping member 21 in the direction of the end A via an elastic body 42 such as a spring. The provision of the biasing member 41 more reliably prevents elastic deformation of the end of the lip portion when the blade portion 31 approaches the side of the end B of the blade rubber. As a result, movement of the blade portion in the advancing direction can be prevented, and the generation of a vibrating shape on the cutting surface can be more reliably prevented.

[0158] In addition, the regeneration device 20 preferably includes a pressing member that presses the top end of the contact portion including the scraper rubber in the lateral direction of the scraper rubber to suppress the scraper rubber caused by the movement of the blade portion. More specifically, it is preferred to include a pressing member that presses the top end of the contact portion including the scraper rubber in the lateral direction of the scraper rubber and the thickness direction of the blade portion (a direction perpendicular to the direction of intersection of the blades), and more preferably, the pressing member is configured to press the top end surface 7. By providing such a pressing member, the elastic deformation of the lip portion during the movement of the blade portion 31 from end A toward end B can be more reliably prevented. Specifically, as Figure 5 and Figure 7 As shown in FIG7A and FIG7B , the regenerating device 20 preferably includes a pressing member 51 for pressing the tip of the lip 3 toward the base 1 of the blade rubber.

[0159] When the blade portion enters from the side of one end side (end A) of the scraper rubber and moves toward the other end side in the longitudinal direction of the scraper rubber while advancing to cut the top end of the scraper rubber, such a pressing member 51 can more reliably prevent the blade portion from advancing in the direction of the scraper rubber. Figure 9 Note that the upward offset of the blade portion in the above-mentioned advancing direction is considered to be because the force applied to the blade portion to advance the blade portion may move upward due to the thin thickness of the cutting target portion of the blade rubber.

[0160] Furthermore, before the blade portion 31 moves relatively from the end portion A to the end portion B, the pressing member 51 preferably presses the tip of the lip portion 3 toward the base portion 1. For example, Figure 5 and Figure 7 As shown in FIG. 7A , the pressing member 51 is provided in the cutting unit 30 and can move according to the movement of the blade portion 31 .

[0161] The present inventors have considered the following reasons why the blade rubber regeneration device 20 described above can suppress deformation of the cut surface of the lip portion 3 and obtain more accurate regenerated blade rubber.

[0162] First, we will describe how to suppress deformation in the early stages of cutting. The regenerating device 20 includes a clamping member 21 that clamps the lip 3. The clamping member 21 is positioned so that at least a portion of the blade portion 31 of the scraper rubber can be clamped therein. The position of the clamping member relative to the scraper rubber is preferably fixed. That is, in the regenerating device 20, the clamping member 21 preferably clamps the scraper rubber and does not move relative to it, even when the blade portion 31 moves.

[0163] As described above, it is believed that the portion of the clamping lip 3 into which the blade 31 enters suppresses elastic deformation of the blade rubber due to the pressure caused by the blade 31 entering the blade rubber. Therefore, the blade rubber can be prevented from having a rounded surface as a macroscopic shape at the end of the blade 31 entering the section after cutting. As a result, the generation of a vibration shape on the cut surface can be more reliably prevented.

[0164] That is, by clamping the lip 3 with the clamping member, the entry of the blade portion into the blade rubber becomes stable. As a more preferred aspect, in the case where the clamping member 21 for clamping the lip 3 from both sides is provided, as shown in FIG. Figure 8 As shown in FIG. 3 , it is considered that excessive elastic deformation is suppressed and pressure is uniformly applied to the lip portion 3. As a result, it is considered that Figure 8 As shown by the dotted line in FIG, the advancing direction of the blade portion 31 in the lip portion 3 is more stable, and the generation of the vibration shape on the cutting surface can be more reliably suppressed.

[0165] Note that, in order to more reliably suppress deformation of the entry section of the blade portion 31 in the lip portion 3, the clamping member 21 only needs to clamp at least a portion of the blade portion 31 into which it enters. Figure 6 As shown in Figures 6A and 6B, the clamping member 21 can clamp the lip 3 over the entire area in the longitudinal direction of the lip 3.

[0166] In addition, the regeneration device 20 preferably includes a pressing member 51 that presses the top end of the lip 3 toward the base 1 before the blade portion 31 moves relatively from the end A to the end B. Since the lip 3 can be pressed by such a pressing member 51 at a position immediately before the blade portion 30 cuts, it can be considered that the advancement of the blade portion is further stabilized, and the elastic deformation of the lip 3 caused by the flipping of the cutting piece of the blade portion 31 can be further suppressed. That is, the pressing member 51 can prevent the vibration (chatter) of the blade portion 31 caused by the movement of the blade portion 31 and the movement of the scraper rubber toward the top end side in the advancement direction. As a result, the cutting advancement direction of the blade portion 31 is further stabilized, and the generation of a vibrating shape on the cutting surface can be more reliably prevented.

[0167] That is, Figure 9As shown in FIG9B, it is preferred that the pressing member 51 is moved in the direction of the arrow together with the blade portion 31 while pressing the lip portion 3 in the direction of the base portion 1 before the blade portion 31. According to this regeneration device, the elastic deformation of the lip portion 3 caused by the movement of the blade portion 31 is suppressed by the pressing member. Therefore, it is considered that even if the blade portion 31 advances, the lip portion 3 is unlikely to be elastically deformed, and the cut surface can be as shown in FIG9B. Figure 9 For example, the pressing member 51 and the blade portion 31 may be configured to move while maintaining a constant distance between the top end of the blade portion 31 and the pressing member 51 .

[0168] Furthermore, in the regeneration device 20, when the blade portion 31 reaches the vicinity of the end B, the biasing member 41 that contacts the side of the end B of the lip 3 and biases the lip 3 in the direction of the end A can more reliably suppress the extension caused by the elastic deformation of the tip side of the lip at the end B. As a result, the generation of a vibrating shape on the cut surface can be more reliably prevented.

[0169] That is, Figure 10 As shown in FIG. 1 , since the biasing member 41 is provided, the extension of the lip 3 can be more reliably suppressed when the blade portion 31 reaches the rear end portion of the lip 3. Figure 10 As shown by the dotted line in , the cutting surface can be a smooth surface that does not produce a vibrating shape.

[0170] In order to more reliably prevent the rear end portion of the lip portion 3 from being elastically deformed as the blade portion 31 advances during the cutting step, it is more preferable to include the pressing member 51 and the biasing member 41 .

[0171] As described above, when the regeneration device including the clamping member, the pressing member, and the biasing member is used to regenerate the blade rubber having the specific storage elastic modulus and the specific fracture stress according to the present disclosure, the elastic deformation of the lip from the time when the blade portion enters the lip to the completion of cutting can be more reliably suppressed, and the generation of a vibration shape on the cut surface of the lip can be more reliably prevented. In addition, the formation of the cut surface as shown in FIG. Figure 11 An S-shaped curve is shown as the macroscopic shape.

[0172] Next, each component of the blade rubber regenerating device 20 will be described in detail.

[0173] The regenerating device 20 includes a blade portion 31. The cutting blade constituting the blade portion 31 only needs to be able to cut the lip portion by relative movement, and may be a flat blade or a circular blade.

[0174] like Figure 6As shown in Figure 6B, when a flat blade is used as the cutting blade constituting the blade portion 31, there is no particular restriction on the angle (blade angle θA) formed laterally relative to the lip portion 3 of the blade. The blade portion 31 only needs to be arranged in the regeneration device 20 so that the angle is preferably 20° to 70°, more preferably 30° to 60°, and further preferably 40° to 50°. Figure 6 6A is an example in which the blade angle θA is 45°.

[0175] In a cross-sectional view of the regeneration device 20 along the length of the scraper rubber, the angle θB (not shown) formed by the length direction of the lip 3 (e.g., the horizontal plane of the device) and a direction perpendicular to the blade's intersecting direction and parallel to the blade body is preferably 0° to 10°, more preferably 2° to 8°, and even more preferably 3° to 7°, when the blade edge is facing the base 1. Angle θB within the above range means that the blade is slightly tilted toward the base 1 of the scraper rubber. As a result, the cut piece is easily released to the side opposite to the forward direction of the blade portion.

[0176] The cutting blade can be a double-edged blade or a single-edged blade. Figure 5 In the regeneration device 20 shown in the figure, a double-edged blade is used as the blade portion 31. The thickness of the blade is not particularly limited, and is preferably 0.05 to 0.50 mm, more preferably 0.10 to 0.30 mm. The tip angle (edge angle) of the blade is not particularly limited, and is preferably 15° to 55°, more preferably 25° to 50°, and further preferably 35° to 45°. Within the above range, it is easy to properly cut the lip. The regeneration device 20 shown is an example of 45°.

[0177] The blade portion 31 only needs to be fixed to the regeneration device 20 (cutting unit 30) with a force that keeps the angle of the cutting blade constant during the cutting process. For example, it only needs to be fastened with bolts or the like. Figure 6 6A shown in the blade portion 31 can be fixed on one side. The blade portion 31 can be fixed across when the blade portion 31 passes through, for example Figure 6 6A and the left and right cutting units 30 and the two sides of the lip when the regeneration device 20 is viewed from the side of the top end of the lip (eg, the upper side of the device). Therefore, the cutting accuracy is further improved.

[0178] There is no special restriction on the feed speed (i.e., the speed of relative movement) of the cutting blade in the regeneration device 20, as long as the feed speed is within the range that can properly cut the lip 3. It is preferably 500 to 5000 mm / second, more preferably 800 to 2000 mm / second, and further preferably 900 to 1500 mm / second.

[0179] The width of the slice of lip 3 cut by blade portion 31 is also not particularly limited and corresponds to the size of the lip of the scraper rubber to be used. The slice width (the length of the lip of the scraper rubber in the lateral direction (the length between the first side 5 and the second side 6) in the portion to be cut) preferably ranges from 0.1 to 5.0 mm, 0.2 to 2.0 mm, or 0.3 to 1.0 mm. The material of blade portion 31 is not particularly limited; known materials can be used as appropriate depending on the scraper rubber to be cut. For example, stainless steel or iron can be used.

[0180] The regeneration device 20 preferably includes a clamping member 21 that clamps at least a portion of the lip 3 from both sides of the lip 3. The clamping member 21 clamps and fixes the lip 3, and suppresses elastic deformation caused by the entry of the blade portion. The clamping member 21 only needs to be set at a position that can clamp a portion of the lip into which the blade portion 31 enters. The portion into which the blade portion enters refers to a portion that can suppress elastic deformation of the lip due to the entry of the blade portion by clamping near the contact point between the blade portion and the lip. For example, this portion is located near the position where the blade portion enters, and is a portion that is elastically deformed due to the entry of the blade portion when the two sides of the lip are not clamped.

[0181] The clamping member 21 can clamp the entire lip. Figure 6 As shown in Figures 6A and 6B, the clamping member 21 can be a member that is sufficiently longer than the length of the blade rubber 100 in the longitudinal direction, thereby clamping and securing the entire area of the lip portion from both sides along the longitudinal direction. Furthermore, for example, the clamping member 21 can clamp the base portion 1 side at the position where the blade portion 31 enters. The material of the clamping member 21 is not particularly limited, and steel materials such as pre-hardened steel and known materials such as stainless steel or aluminum can be used.

[0182] The pressure when the lip 3 is clamped and fixed by the clamping member 21 is not particularly limited, and can be appropriately changed according to the material of the scraper rubber, etc. The lip 3 only needs to be fixed with a force that can suppress the elastic deformation caused by the entry of the blade portion 31. In addition, the lip only needs to be fixed with a force that does not deform unnecessarily due to clamping. There is no particular limitation on the fixing method, and a known method such as tightening with bolts can be adopted. For example, as the tightening force of the bolt when the lip is clamped by tightening the clamping member 21 with a bolt, the ranges of 5.0 to 50.0 N / m, 10.0 to 30.0 N / m and 12.0 to 20.0 N / m are preferably exemplified. For example, the clamping member 21 preferably clamps the position corresponding to the portion into which the blade portion enters with the tightening force.

[0183] Figure 12 yes Figure 77B is a further enlarged view of the area around the tip of the lip 3, which is a cross-sectional view of the cutting unit 30 and the clamping member 21 in the direction transverse to the blade rubber. The portion of the lip 3 held by the clamping member 21 is defined as the clamping portion, and the length of the portion of the tip of the lip 3 protruding from the clamping portion to the outside of the clamping member 21 is defined as the lip protrusion length A.

[0184] From the viewpoint of more easily suppressing elastic deformation of the lip portion 3 , the protruding length A of the lip portion is preferably 0.10 to 1.00 mm, more preferably 0.20 to 0.50 mm, and further preferably 0.30 to 0.40 mm.

[0185] In addition, if Figure 12 As shown, the length (the shortest distance) from the clamping portion of the lip portion held by the clamping member 21 to the tip of the blade is set as length B. From the perspective of more easily suppressing the elastic deformation of the lip portion 3, B is preferably 0.200 mm or less, more preferably 0.150 mm or less, and even more preferably 0.130 mm or less. The lower limit is preferably as small as possible, and the length is preferably greater than 0.000 mm to prevent interference between the blade and the clamping portion. As examples of length B, preferably, the range is greater than 0.000 mm and less than 0.200 mm, greater than 0.000 mm and less than 0.150 mm, and greater than 0.000 mm and less than 0.130 mm.

[0186] Furthermore, from the viewpoint of more easily suppressing the elastic deformation of the lip portion 3 , the value of B / A is preferably 0.10 to 0.55, more preferably 0.20 to 0.45, and further preferably 0.30 to 0.40.

[0187] also, Figure 12 The cut thickness at the tip of the lip 3 corresponding to the middle AB (the length of the scraper rubber in the base-to-lip tip direction) only needs to be appropriately changed according to the purpose of regeneration, the length of the lip before regeneration, and the degree of deterioration of the lip, and there is no particular limitation. From the perspective of reuse through regeneration, it is preferable that the cut thickness is thin because the number of repeated regenerations can be increased. By making the cut thickness thinner and repeatedly regenerating and using the regenerated results multiple times, resource utilization can be promoted more effectively. The cut thickness is preferably 0.05 to 1.00 mm, and more preferably 0.10 to 0.50 mm.

[0188] The pressing member 51 is a member that presses the tip of the lip 3 and suppresses elastic deformation caused by the movement of the blade portion. The regeneration device 20 includes the pressing member 51, which presses the tip of the lip 3 toward the base 1 before the blade portion 31 moves relative to each other from end A to end B. The pressing member 51 is not particularly limited as long as the pressing member can press the lip before the blade portion 31 moves relative to each other. The pressure can be any force that can suppress the elastic deformation of the lip 3 caused by the turning of the cutting blade.

[0189] For example, a member having a predetermined hardness is provided at a position facing and in contact with the tip of the lip 3. Specifically, the pressing member 51 preferably moves in contact with the tip of the lip 3 and is preferably provided at a position facing the tip of the lip 3. This allows the pressure to be appropriately varied depending on the protruding length A of the lip 3. The pressing member 51 may or may not be biased relative to the lip 3 in the direction of the base 1 by an elastic body such as a spring.

[0190] As the blade portion moves along the length of the scraper rubber, the cutting blade of the lip is fed into the space above and behind the blade portion as cutting progresses. Preferably, during the relative movement of the blade portion 31, the pressing member 51 reduces or releases the pressure above and behind the tip of the blade portion 31, thereby filling the cutting blade of the lip and not hindering the movement of the regenerating cutter. Examples of the degree of pressure reduction include methods that reduce the force to a level that does not hinder the movement of the blade portion 31.

[0191] From the viewpoint of regenerating the blade rubber with higher accuracy, it is preferable that the pressing member 51 releases the pressing so that the cutter sheet can be easily fed to the rear of the blade.

[0192] For example, Figure 5 As shown, the pressing member 51 is preferably a disc-shaped member. The pressing member 51 may be fixed to the cutting unit 30 or pivotally supported by the cutting unit 30. From the perspective of facilitating pressing with a constant force, it is preferably pivotally supported. Examples of one aspect of the pressing member 51 fixed to the cutting unit 30 include a disc-shaped member and a member having an R-shaped convex shape in the direction of the lip 3. The method of axial support is also not particularly limited, and known methods using bearings, etc. can be adopted.

[0193] From the viewpoint of weakening or easily releasing the pressing force above and behind the tip of the blade portion 31, the pressing member 51 is preferably formed by, for example, Figure 5 The pressing member 51 is provided together with the blade 31 in the cutting unit 30 and moves in synchronization with the movement of the blade 31. Preferably, the pressing member 51 moves while keeping the distance between the tip of the blade 31 and the pressing portion constant.

[0194] In the illustrated embodiment, the pressing member 51 is a disc-shaped roller member that is pivotally supported by the cutting unit 30 and rotates in contact with the clamping member 21 as the cutting unit 30 moves relative to the cutting unit 30. Since the pressing member 51 rotates in contact with the clamping member 21, the pressing position and pressing force can be easily maintained constant, which is preferable. In addition, the pressure can be controlled by the hardness of the pressing member 51 and the protruding length A of the lip 3.

[0195] like Figure 9 As shown in FIG9B , the distance between the position corresponding to the cutting edge of the blade portion 31 and the contact point between the pressing member 51 and the lip portion 3 in the longitudinal direction of the lip portion 3 is defined as X. X is preferably 1 to 30 mm, more preferably 5 to 20 mm, and even more preferably 10 to 18 mm. In other words, it is preferred that the pressing member 51 presses the lip portion before the blade portion 31 moves the distance X. Within this range, elastic deformation of the lip portion caused by the turning of the cutting blade can be more easily suppressed.

[0196] In addition, when the pressing member 51 is a disc-shaped member, as shown in FIG. Figure 9 As shown in FIG9B , the distance between the center of the disk and the horizontal plane of the lip 3 is set to Y. Y is preferably 5.0 to 100.0 mm, more preferably 10.0 to 70.0 mm, and further preferably 20.0 to 50.0 mm.

[0197] When X and Y are below the above upper limits, it is easier to prevent the cut piece from turning over. When X and Y are above the above lower limits, it is easier to maintain the cutting resistance favorably.

[0198] The value of X / Y is preferably from 0.40 to 0.80, more preferably from 0.50 to 0.70, further preferably from 0.55 to 0.65.

[0199] For example, the lip portion may be pressed so that the value of the radius Y of the disk member is preferably 0.01 to 0.2 mm, more preferably 0.05 to 0.15 mm. The value of the radius Y of the disk member indicates the degree to which the pressing member is deformed by pressing.

[0200] The width of the pressing member 51 (the length of the lip 3 in the lateral direction) is not particularly limited as long as it can press the lip 3. Preferred examples include ranges of 1 to 100 mm, 2 to 50 mm, and 5 to 20 mm.

[0201] The hardness of the pressing member 51 is not particularly limited, as long as it can press the lip portion 3. The Wallace hardness of the pressing member 51 is preferably 70 to 100 degrees, more preferably 75 to 80 degrees. Within this range, the pressing member easily deforms appropriately, the upward tilt suppression effect is further improved, and an excessive increase in cutting resistance can also be suppressed.

[0202] The Wallace hardness can be measured by using, for example, a Wallace microhardness tester (manufactured by Wallace Instruments) as a measuring instrument according to Japanese Industrial Standards (JIS) (JIS) K6253-2:2012.

[0203] The material of the pressing member 51 is not particularly limited, and known materials can be used. Examples include rubber materials such as polyurethane rubber (ester polyurethane and ether polyurethane), silicone rubber, fluorocarbon rubber, and natural rubber; and metals such as aluminum and stainless steel. From the perspective of satisfying the aforementioned Wallace hardness, rubber materials such as ester polyurethane are preferred.

[0204] The regeneration device 20 preferably includes a biasing member 41 that contacts the side of the end B of the lip 3 and biases the lip in the direction of the end A. The biasing member 41 only needs to bias the end B to a degree that can suppress the elastic deformation of the lip 3 in the longitudinal direction (especially the elastic deformation of the top end side of the lip). For example, the biasing member can have a shape that can bias the clamping portion and the portion from the clamping portion to the top end side of the lip 3 by the clamping member 21 ( Figure 10 ), or may have a shape capable of biasing the entire surface of the end portion B of the lip. The biasing member 41 preferably has a shape capable of biasing the clamping portion and the portion from the clamping portion to the tip side of the lip 3.

[0205] Figure 13 : is a cross-sectional view of the position of the lip 3 clamped between the clamping members 21 in the longitudinal direction of the lip 3. The biasing member 41 is clamped between the clamping members 21 that clamp the lip 3 and biases the end B in the direction of the end A ( Figure 11 The same is true for B). In addition, the biasing member 41 itself can be an elastic member. Preferably, the biasing member 41 is in a state of not being fixed to the clamping member 21, that is, the biasing member 41 is in a state of being loosely fitted to the clamping member 21.

[0206] For example, Figure 14 As shown in FIG14A , the biasing member 41 is inserted between the clamping members 21 through a hole provided in the retaining member 15 . Figure 14 As shown in FIG14B , a spring is inserted as an elastic member 42 so that the biasing member 41 can bias the end B, and the spring is pressed and fixed by the cover 43 , whereby the end B is biased by the biasing member 41 .

[0207] The shape of the biasing member 41 is not particularly limited, and for example Figure 10The plate-shaped member shown. The plate shape facilitates application between the clamping members 21. As the plate-shaped member, for example, a backing plate can be used depending on the size of the gap between the clamping members 21. The backing plate is not particularly limited, and known metals such as iron-based metals, stainless steel-based metals, or copper-based metals can be used. Examples include cold-rolled steel sheets.

[0208] The thickness of the backing plate only needs to be appropriately changed, taking into account the thickness of the lip 3 and the gap between the clamping members 21. Examples include the ranges of 0.1 to 2.0 mm and 0.2 to 1.0 mm. The length and height of the backing plate are also not particularly limited; it is only necessary to use a backing plate that corresponds to the size of the lip 3 and the size of the device.

[0209] The biasing member 41 only needs to be able to bias the end portion B to an extent that can suppress elastic deformation of the lip portion 3 in the longitudinal direction. For example, when a spring is used as the biasing member 41 itself or as an elastic body for biasing the biasing member 41, a spring having an allowable load preferably in the range of 10 to 100 N, more preferably in the range of 20 to 60 N, can be used. Furthermore, the spring constant is preferably 1.0 to 10.0 N / mm, more preferably 2.0 to 5.0 N / mm.

[0210] Another aspect of the present disclosure relates to a method for producing a regenerated blade rubber, wherein the method includes obtaining the blade rubber regenerated by the regeneration method.

[0211] Example

[0212] The present invention will be described in detail below using examples. Note that the present invention is not limited to the following examples. In the following formulations, parts are based on mass unless otherwise specified.

[0213] <Preparation of Regeneration Device A>

[0214] As the scraper rubber regeneration device A used in the embodiment, a Figure 5 、 Figure 6 、 Figure 7 and Figures 12 to 14 The scraper rubber regeneration device according to at least one aspect of the present disclosure is described. More specifically, the following scraper rubber regeneration device is prepared: The length between the holding members 15 is set to 1000 mm.

[0215] (Blade portion 31)

[0216] The following blades were fixed to the cutting unit 30 at the following angles θA and θB. Blade type: High-speed steel (SKH material) (product name · material), double-edged flat blade, tip angle (edge angle) 45°, 3-time polishing (DLC coated product), blade thickness 0.25 mm

[0217] Blade angle θA: 45°

[0218] Angle of the blade relative to the horizontal plane of the fixture (forming angle θB): 5°

[0219] Blade pressing: Figure 7 As shown in FIG7B , the blade is clamped between the cutting units 30 , and both sides of the blade are fastened with bolts.

[0220] (Clamping member 21)

[0221] The clamping member is made as follows, and the blade rubber is fixed according to the blade portion 31 to have the following slicing width, protruding length A, and length B.

[0222] Material of the clamping member 21: Free-cutting pre-hardened steel (product number: NAK55)

[0223] Pressure: 14.7N / m (tightened and clamped with M3 bolts)

[0224] Slice width: 0.7mm

[0225] Protrusion length A: 0.35mm

[0226] Length B (from the clamping part to the tip of the blade): 0.125mm

[0227] (Pressure member 51)

[0228] As the pressing member 51, a member produced by processing a standard urethane sheet (product number: UTM, manufactured by MISUMI Co., Ltd.) made of ester-based polyurethane and having a Wallace hardness of 80 degrees into a disk shape having a diameter of 57.0 mm and a width of 10 mm was used. Figure 9 As shown in FIG9B , the pressing member 51 is fixed to the cutting unit 30 at a position where the distance X is 17 mm and the distance Y is 28.4 mm. In addition, the pressing member 51 is pivotally supported by the cutting unit 30 so as to be rotatable via a bearing cam follower (product number: CFUA3-10, manufactured by MISUMI Co., Ltd.). The pressing member 51 is in contact with the lip (the value of the radius Y of the disk = 0.1 mm) and is fixed so that the pressing member 51 can be rotated by the movement of the cutting unit 30. Through this contact, the top end of the lip protruding from the clamping member 21 by the protruding length A is pressed by the pressing member 51. In this way, the pressing member 51 is configured to be able to press the lip by the distance X before the blade moves.

[0229] (Biasing member 41)

[0230] like Figure 5 and Figure 6As shown in FIG6B , a backing plate made of a cold-rolled steel plate having a length of 50 mm, a height of 10 mm, and a thickness of 0.6 mm is passed between the clamping members 21 as a biasing member 41, and the end B of the blade rubber is biased in the direction of the end A by using a spring 42 and a cover 43. As the spring 42, a spring having a spring constant of 2.9 N / mm and an allowable load of 30 to 50 N (Model No. WL18-35, manufactured by MISUMI Co., Ltd.) is used.

[0231] <Preparation of Regeneration Device B>

[0232] A regeneration device B having the same configuration as the regeneration device A except that the biasing member 41 is not provided was prepared.

[0233] <Preparation of Regeneration Device C>

[0234] A reproducing device C having the same configuration as the reproducing device A except that the biasing member 41 and the pressing member 51 are not provided was prepared.

[0235] <Preparation of Regeneration Device D>

[0236] A reproducing device D having the same configuration as the reproducing device A was prepared, except that the biasing member 41 and the pressing member 51 were not provided and the pressure of the clamping member was set to 0.0 N / m.

[0237] A summary of regeneration devices A to D is summarized in Table 1 below.

[0238] [Table 1]

[0239] Table 1

[0240]

[0241] (Example 1)

[0242] <Production of Scraper Rubber 1>

[0243] 219.0 g of 4,4′-diphenylmethane diisocyanate (trade name: Millionate MT, manufactured by Tosoh Corporation) (hereinafter referred to as 4,4′-MDI, abbreviated as “MDI” in the table), 210.0 g of tris(phenylisocyanate)thiophosphate (trade name: Ultimate Super CAII, manufactured by TOHO Chemical Industry Co., Ltd.) (hereinafter referred to as TPTI) as a trifunctional or higher polyfunctional isocyanate, and 571.0 g of polybutylene adipate polyester polyol having a number average molecular weight of 2500 (trade name: NIPPOLAN 3027, manufactured by Tosoh Corporation) (hereinafter referred to as PBA2500) were brought into contact with each other at 80° C. for 3 hours to obtain a prepolymer.

[0244] Subsequently, the components in the following Table 2 were mixed to prepare a curing agent.

[0245] [Table 2]

[0246] Table 2

[0247]

[0248] The curing agent was added to the prepolymer and mixed to obtain a raw material composition. This raw material composition was injected into a blade rubber forming mold and cured at 130°C for 2 minutes. The mold was then demolded to obtain a polyurethane molded body. Note that release agent A was pre-applied to the blade rubber forming mold to prevent chipping of the lip edge during demolding. Release agent A was a mixture of the materials listed in Table 3 below.

[0249] [Table 3]

[0250] Table 3

[0251]

[0252] The tip of the lip portion of the polyurethane molded body was cut to obtain the blade rubber 1 according to this example. The longitudinal length of the blade rubber was set to 650 mm. Furthermore, the thickness of the neck portion was set to 0.22 mm, and the thickness of the lip portion was set to 0.7 mm. The physical properties of the resulting blade rubber 1 were evaluated using the following methods.

[0253] [Evaluation 1-1; Measurement method of storage elastic modulus E']

[0254] The storage elastic modulus E' was measured by temperature-frequency dispersion using a dynamic viscoelasticity device, and a total curve was created and calculated based on the temperature-time conversion law.

[0255] The conditions will be described below.

[0256] Apparatus: Dynamic viscoelasticity measuring apparatus (trade name: DMAEXPLEXOR 500N, manufactured by NETZSCH Co.)

[0257] Measuring mode: tension

[0258] Static strain: 2%

[0259] Dynamic strain: 0.5%

[0260] Measuring temperature: -30°C to 80°C (56 points, increments of 2°C)

[0261] Measuring frequency: 0.1 to 100 Hz (5 points)

[0262] The overall curve was created using the device's built-in software at a reference temperature of 24 °C.

[0263] The obtained total curve is mathematically approximated based on the generalized Maxwell model. The generalized Maxwell model is as follows.

[0264] [Mathematical formula 1]

[0265]

[0266] From the above formula, the separation of storage elastic modulus E' and loss elastic modulus E" can be described as follows.

[0267] [Mathematical formula 2]

[0268]

[0269] The number of terms in the generalized Maxwell model is set to be the elastic term (E e )1+ viscoelastic term (E i )20 (i=1 to 20). τ i In 10 -8 to 10 5 The 20 points between E and e and E i The GRG nonlinear optimization (generalized descending gradient method) was used to minimize the difference between the E' and E' of the Maxwell model and the E' and E' of the overall curve. Specifically, the solver function of Excel was used. Based on the obtained overall curve approximate expression, E' (at 1×10 3 E' at Hz).

[0270] Note that the samples used for measurement were produced in the following manner.

[0271] The sample was produced so as to include the contact area of the blade rubber and the member to be cleaned. The sample was produced by cutting the sample into a strip having a length of 50 mm, a width of 1 mm, and a thickness of 0.7 mm.

[0272] [Evaluation 1-2; Measurement method of fracture stress]

[0273] The breaking stress was measured in accordance with Japanese Industrial Standard (JIS) K6254-1993 by using a Tensilon universal testing machine (trade name: RTG-1225, manufactured by A&D Company, Limited) at a tensile speed of 500 mm / min, a breaking point measurement sensitivity of 0.01 N, a marking line distance of 20 mm, a test temperature of 24° C., and two measurements. The average of the two measurements was taken as the breaking stress.

[0274] Note that the samples used for measurement were produced in the following manner.

[0275] The tip portion of the scraper blade including the contact area with the member to be cleaned was cut to a length of about 100 mm in the longitudinal direction, and the thickness and width of the cut piece were measured to use as a strip measurement sample.

[0276] [Evaluation 1-3; Measurement Method of Type and Concentration of Polyfunctional Alcohol]

[0277] The polyfunctional alcohol was detected by pyrolysis GC / MS (gas chromatography and mass spectrometry). The measurement conditions are shown below.

[0278] Sampling location: The sample sampled from the tip of the blade rubber is measured by the following method. Note that when sampling, the member such as polyurethane is cut with a biocutter.

[0279] Device:

[0280] Pyrolysis device: Trade name: EGA / PY-3030D, manufactured by Flortier lab Co.

[0281] Gas chromatography apparatus: TRACE1310 gas chromatograph, manufactured by ThermoFisher Scientific Co.

[0282] Mass spectrometer: ISQLT, manufactured by ThermoFisher Scientific Co.

[0283] Pyrolysis temperature: 500℃

[0284] GC column: 0.25mm inner diameter × 30m stainless steel capillary column

[0285] Stationary phase: 5% phenyl polydimethylsiloxane

[0286] Heating conditions: The temperature was maintained at 50°C for 3 minutes and then increased to 300°C at a rate of 8°C / min.

[0287] MS conditions: mass range m / z 10 to 650

[0288] Scanning speed: 1 second / scan

[0289] The polyfunctional alcohol species were qualitatively determined by GC / MS. A calibration curve for GC analysis of the qualitative polyfunctional alcohols of known concentrations was created, and quantification was performed based on the GC peak area ratio. The arithmetic mean of the values obtained from the samples at the tip of the blade rubber was taken as the polyfunctional alcohol concentration.

[0290] [Evaluation 1-4; Measurement of M1, M2 and M3]

[0291] M1 to M3 were measured not by a gas chromatograph (GC) but by using a direct sample introduction method (DI method) in which a sample is directly introduced into an ion source.

[0292] An ion trap type GC / MS (trade name: POLARIS Q, manufactured by Thermo Fisher Scientific Inc.) was used as an apparatus, and a direct exposure probe (Direct Exposure Probe (DEP)) was used as a direct introduction probe.

[0293] The sample taken from the tip of the blade rubber is measured by the following method: Note that when taking the sample, a member such as polyurethane is cut with a biocutter.

[0294] A 0.1 μg sample, taken from the tip of the blade rubber, was attached to a filament at the probe tip and inserted directly into the ionization chamber. It was then rapidly heated from room temperature to 1000°C at a constant temperature ramp rate (approximately 10°C / s), and the vaporized gases were detected by a mass spectrometer.

[0295] When the detection amount M1 of all ions is set to the sum of the integrated intensities of all peaks in the total ion current thermogram obtained, and

[0296] When the sum of the integrated intensities of the peaks in the extracted ion thermogram with m / z values derived from trifunctional or higher polyfunctional isocyanates is set as M2 (M2 / M1), (M2 / M1) is calculated using the values of M1 and M2. When the sum of the integrated intensities of the peaks in the extracted ion thermogram with m / z values derived from diisocyanates is set as M3, (M3 / M1) is calculated using the values of M1 and M3. The arithmetic mean of the obtained values is taken as the values of (M2 / M1) and (M3 / M1).

[0297] Here, TTI used as a trifunctional or higher polyfunctional isocyanate in this example has a structure represented by the following chemical formula (3). In the extracted ion thermogram obtained in this evaluation, a peak derived from a positive ionized product of TTI was detected, having a peak top at an m / z of 366.5 to 367.5. Therefore, in this example, the integrated intensity of the peak was set as M2.

[0298] [Chemical Formula 3]

[0299]

[0300] In addition, in other examples described later, regarding a blade rubber containing polyurethane synthesized by using polymeric MDI as a trifunctional or higher polyfunctional isocyanate, in the extracted ion thermogram obtained in this evaluation, peaks of positively ionized products derived from polymeric MDI having peak tops at respective positions in the structure represented by Chemical Formula (1)' within the range of 380.5 to 381.5 for m / z values indicating n=1, within the range of 511.5 to 512.5 for m / z values indicating n=2, within the range of 642.5 to 643.5 for m / z values indicating n=3, and within the range of 773.5 to 774.5 for m / z values indicating n=4 were detected. Therefore, in this example, the sum of the integrated intensities of the respective peaks was set as M2.

[0301] Similarly, in the examples described later, tris(phenylisocyanate)thiophosphate (TPTI), used as a trifunctional or higher polyfunctional isocyanate, has a structure represented by chemical formula (4). In the extracted ion thermogram obtained in this evaluation, a peak derived from a positive ionized product of TPTI with a peak top at an m / z of 464.5 to 465.5 was detected. Therefore, in this example, the integrated intensity of the peak was set to M2.

[0302] [Chemical Formula 4]

[0303]

[0304] On the other hand, in the case of 4,4'-MDI as a diisocyanate, the structure represented by Chemical Formula (2) was detected by positive ionization within the range of m / z of 249.5 to 250.5 derived from 4,4'-MDI. The integrated intensity of the peak in the extracted ion thermogram corresponding to this structure was taken as (M3).

[0305] <Production of Scraper Rubbers 2 to 13>

[0306] Blade rubbers 2 to 13 were produced in the same manner as blade rubber 1 except that the kind and blending amount of the prepolymer and the kind and blending amount of the curing agent were changed as described in Tables 3-1 and 3-2. The obtained blade rubbers 2 to 13 were subjected to evaluations 1-1 to 1-4.

[0307] Note that, in the production of the blade rubber 2 , the blade rubber 5 , and the blade rubber 9 , pentaerythritol (manufactured by Tokyo Chemical Industry Co., Ltd.) was used as a polyfunctional alcohol for a curing agent.

[0308] In the production of the blade rubber 3, polymeric MDI (trade name: Millionate MR-400, manufactured by Tosoh Corporation) (hereinafter referred to as MR400) is used as a trifunctional or higher polyfunctional isocyanate for a prepolymer.

[0309] In the production of the blade rubber 4 and the blade rubber 6, polymeric MDI (trade name: Millionate MR-200, manufactured by Tosoh Corporation) (hereinafter referred to as MR200) was used as trifunctional or higher polyfunctional isocyanate for the prepolymer.

[0310] In addition, in the production of the blade rubber 4 and the blade rubber 8, glycerin (manufactured by Tokyo Chemical Industry Co., Ltd.) was used as a polyfunctional alcohol for a curing agent.

[0311] Furthermore, in the production of the blade rubber 8, triphenylmethane-4,4',4"-triisocyanate (trade name: UltiteSuper CA, manufactured by TOHO Chemical Industry Co., Ltd.) (hereinafter referred to as TTI) is used as a trifunctional or higher polyfunctional isocyanate for the prepolymer.

[0312] In the production of blade rubber 7, polymeric MDI (trade name: Cosmonate M-200, manufactured by Mitsui Chemicals, Inc.) (hereinafter referred to as M-200) was used as a trifunctional or higher-functional polyfunctional isocyanate for the prepolymer. Polytetramethylene ether glycol with a number average molecular weight of 2000 (trade name: PTG-2000SN, manufactured by Hodogaya Chemical Co., Ltd.) (hereinafter referred to as PTG-2000SN) was used as a polyol. In addition, polytetramethylene ether glycol with a number average molecular weight of 1000 (trade name: PTG-1000SN, manufactured by Hodogaya Chemical Co., Ltd.) (hereinafter referred to as PTG-1000SN) was used as a polyol for the curing agent.

[0313] <Production of Blade Rubber 14 (Comparative Example)>

[0314] 50.0 parts by mass of carbon black (trade name: TOKA BLACK #7360SB, manufactured by Tokai Carbon Co., Ltd.), 5.0 parts by mass of zinc oxide (trade name: 2 kinds of zinc oxide, manufactured by Sakai Chemical Industry Co., Ltd.), 1.0 part by mass of zinc stearate (trade name: SZ-2000, manufactured by Sakai Chemical Industry Co., Ltd.) and 25 parts by mass of calcium carbonate (trade name: Nanox #30, manufactured by Maruo Calcium Co., Ltd.) were added to 100 parts by mass of natural rubber, and the mixture was kneaded for 15 minutes with a sealed mixer adjusted to 50°C.

[0315] 1.2 parts by mass of sulfur and 4.5 parts by mass of tetrabenzylthiuram sulfide (TBzTD) (trade name: Perkasit TBzTD, manufactured by FLEXKINS CORPORATION) were added thereto as a vulcanizing agent. The mixture was then kneaded for 10 minutes using a two-roll machine cooled to 25°C to obtain a rubber composition. The obtained rubber composition was placed in a blade rubber forming mold and vulcanized by heating at 170°C for 20 minutes. Thereafter, demolding was performed to obtain blade rubber 14 according to Comparative Example 1.

[0316] Regarding blade rubbers 1 to 14, the kind and blending amount of the prepolymer, the kind and blending amount of the curing agent, and the results of Evaluations 1-1 to 1-4 are shown in Table 4-1 and Table 4-2.

[0317] [Table 4-1]

[0318] Table 4-1

[0319]

[0320]

[0321] [Table 4-2]

[0322]

[0323] (Example 1)

[0324] (Manufacturing of Recycled Scraper Rubber (Recycling Step))

[0325] First, confirm that the edge 8 of the lip 3 of the blade rubber 1 to be regenerated is aligned in the longitudinal direction ( Figure 16 16A in the depth direction of the paper) and is parallel to the edge 1600 of the base 1.

[0326] Then, the blade rubber 1 was fixed to the previously prepared blade rubber regeneration device A by being clamped by the clamping member. The cutting unit 30 was moved from the end A to the end B of the lip portion by using a ROBOCYLINDER (product number RCS3-CT8C, manufactured by EYE I Co., Ltd.) so that the feed speed of the blade was 1000 mm / sec, and the top end of the lip portion of the blade rubber was cut to obtain the regenerated blade rubber 1.

[0327] (Evaluation 2-1)

[0328] The shape of the edge portion newly formed by cutting was observed at a magnification of 1000 times using a digital microscope (trade name: VHX-5000 (main body), VH-ZST (lens); manufactured by Keyence Corporation) for the obtained regenerated blade rubber. Figure 16 As shown in FIG16B, the regeneration scraper blade is fixed so that the lip 3 is positioned vertically downward relative to the base 1, and the angle θ16 formed by the axis 1601 of the lip and the horizontal line 1603 is 45 degrees. The digital microscope 1607 is parallel to the base 1. Figure 16 The shape of the edge 1605 newly formed by the cut surface is photographed vertically from above along the entire length of the recycled scraper rubber. Then, at each position in the length direction of the recycled scraper rubber, the distance L between the straight line 1600 parallel to the edge of the base 1 and the edge 1605 is calculated (see Figure 16 16C). Based on the average value of the distance L of 100 points randomly selected in the length direction ( Figure 16 The maximum value (ΔL) of the difference (absolute value) between each distance L and the average value is obtained ( Figure 16 The obtained results were evaluated based on the following criteria. Here, when ΔL was 0 μm, this meant that the edge 1600 of the base 1 and the new edge 1605 of the lip 3 were parallel to each other, that is, no vibration shape was generated on the cut surface.

[0329] Rank A: ΔL=0 μm or more and less than 1 μm.

[0330] Rank B: ΔL=1 μm or more and less than 5 μm.

[0331] Grade C: ΔL=5 μm or more and less than 10 μm.

[0332] Grade D: ΔL=10 μm or more and less than 30 μm.

[0333] Grade E: ΔL = 30 μm or more.

[0334] (Evaluation 2-2)

[0335] The obtained regenerated blade rubber was subjected to the following evaluation.

[0336] The cutting unit 30 was removed from the regeneration apparatus A, and no objects were located vertically above the cut surface of the regenerated scraper rubber. An ultra-high-speed, high-precision laser dimension measuring instrument (trade name: LS-09030, manufactured by Keyence Corporation, maximum measuring range: 30 mm) was placed on the surface of the flat plate 16 of the regeneration apparatus A, so that the regenerated scraper rubber was located between the laser projection unit and the light receiving unit of the high-speed, high-precision laser dimension measuring instrument. At this time, the distance between the reference position for distance measurement of the high-speed, high-precision laser dimension measuring instrument and the surface of the flat plate 16 was adjusted so that the entire cut surface in the longitudinal direction was located vertically below the reference position. Subsequently, the high-speed, high-precision laser dimension measuring instrument was moved parallel to the longitudinal direction of the regenerated scraper rubber to measure the distance (height) of the cut surface at end A, end B, and end B of the regenerated scraper rubber from the reference position. Furthermore, by setting end A relative to the total length of the scraper rubber (650 mm) to 0, the distance (cutting distance) that the blade advances toward end B without deviating from the scraper rubber to be regenerated was set to P (mm).

[0337] (Evaluation 2-3)

[0338] The water wiping performance of the regenerated wiper blade was evaluated by the following method.

[0339] <Evaluation Method>

[0340] The recycled blade rubber was subjected to a "wiping performance test" in accordance with Japanese Industrial Standard (JIS) D5710:1998 automobile parts - wiper arms and wiper blades.

[0341] A test device equipped with a windshield, a wiper arm, a wiper link, and a wiper motor on the front side of a passenger car ("Wish" (model name, manufactured by Toyota Motor Corporation) was prepared.

[0342] Windshield (“Wish” windshield, manufactured by Toyota Motor Corporation; Model: AZE / ZNE10G·14G·11W; manufactured by AGC Inc.)

[0343] Windshield wiper motor (Model: 85110-1A080, Toyota Motor Corporation genuine part)

[0344] DC regulated power supply (model name: PSW-60L30; manufactured by Texio Technology Co., Ltd.)

[0345] Scraper handle shape: U-shaped hook

[0346] Scraper blade pressure: 18N / m (*scraper blade arm pressure per 1 meter)

[0347] Wiping reciprocating speed of scraper blade: 55 times / minute (1.65m / second in M zone)

[0348] · Length of scraper blade (scraper rubber) in the longitudinal direction: 650mm

[0349] The regenerated scraper rubber, with the scraper support attached, was mounted on the scraper arm of the test device, allowing it to be used normally. The regenerated scraper rubber was mounted so that end A was located on the inner periphery of the windshield and end B was located on the outer periphery of the windshield.

[0350] Water droplets are sprayed onto the surface of the windshield in a mist form, the wiper blade is reciprocated once, and the number of wiping residual lines is visually determined from a position 50 cm away from the surface of the windshield. Note that this evaluation is performed in an environment with an ambient temperature of 25°C and a humidity of 50% RH. Therefore, based on the above criteria, the above determination is made one second after the wiping is completed. The three areas of the windshield (Sin, M, and Sout, see Figure 15 ) The number of residual lines after wiping with water drops.

[0351] Note that the M area is the wiping area formed by the reciprocating motion of the scraper blade ( Figure 15 ) is the wiping range of the shaded portion in the wiping area, Sin is the wiping range excluding the M area in the wiping area and is the wiping range inside the M area, and Sout is the wiping range excluding the M area in the wiping area and is the wiping range outside the M area. In addition, L represents the length of the scraper blade in the longitudinal direction.

[0352] (Evaluation 2-4)

[0353] The wiping performance of the regenerated scraper blade on the oil film was evaluated by the following method.

[0354] The regenerated scraper rubber to be evaluated was mounted on the test apparatus prepared in Evaluation 2-2 in the same manner as in Evaluation 2-3. Subsequently, silicone oil (trade name: KF-96-50cs, manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to the entire wiping surface of the windshield. This simulated a state in which an oil film adhered to the surface of the windshield. Thereafter, the scraper blade was reciprocated once in the same manner as in Evaluation 2-3. Then, the wiping state of the silicone oil on the surface of the windshield was visually observed from the side of the surface opposite to the surface of the windshield coated with the oil film. The ratio of the partial area where the silicone oil film was removed relative to the total wiping area of the scraper blade (hereinafter referred to as the silicone oil film removal area rate (%)) was calculated and evaluated according to the following criteria.

[0355] [Evaluation Criteria]

[0356] Grade A: Silicone oil film removal area rate is 95% to 100%.

[0357] Grade B: The silicone oil film removal area rate is 90% or more and less than 95%.

[0358] Grade C: The silicone oil film removal area rate is 85% or more and less than 90%.

[0359] Grade D: The silicone oil film removal area rate is 80% or more and less than 85%.

[0360] Grade E: The silicone oil film removal area rate is 40% or more and less than 80%.

[0361] Grade F: The silicone oil film removal area rate is 20% or more and less than 40%.

[0362] Grade G: The silicone oil film removal area rate is less than 20%.

[0363] (Examples 2 to 16)

[0364] Regenerated blade rubbers were produced in the same manner as in Example 1 except that blade rubbers 1 to 13 and regenerating devices A to D were combined as described in Table 5. The obtained regenerated blade rubbers were subjected to evaluations 2-1 to 2-4.

[0365] [Table 5]

[0366] Table 5

[0367] Scraper rubber No. Regeneration device Example 1 Scraper rubber 1 Regeneration device A Example 2 Scraper rubber 2 Regeneration device A Example 3 Scraper rubber 3 Regeneration device A Example 4 Scraper rubber 4 Regeneration device A Example 5 Scraper rubber 5 Regeneration device A Example 6 Scraper rubber 6 Regeneration device A Example 7 Scraper rubber 7 Regeneration device A Example 8 Scraper rubber 8 Regeneration device A Example 9 Scraper rubber 9 Regeneration device A Example 10 Scraper rubber 10 Regeneration device A Example 11 Scraper rubber 11 Regeneration device A Example 12 Scraper rubber 12 Regeneration device A Example 13 Scraper rubber 13 Regeneration device A Example 14 Scraper rubber 4 Regeneration device B Example 15 Scraper rubber 4 Regeneration device C Example 16 Scraper rubber 4 Regeneration device D Comparative Example 1 Scraper rubber 14 Regeneration device D

[0368] (Comparative Example 1)

[0369] The blade rubber 14 was regenerated by using the regenerating device D to produce a regenerated blade rubber 14 according to Comparative Example 1, and the regenerated blade rubber was subjected to Evaluations 2-1 to 2-4.

[0370] For the regenerated blade rubbers according to Examples 1 to 16 and Comparative Example 1, the results of Evaluation 2-1 are shown in Table 6, the results of Evaluation 2-2 are shown in Table 7, the results of Evaluation 2-3 are shown in Table 8-1, and the results of Evaluation 2-4 are shown in Table 9.

[0371] [Table 6]

[0372] Table 6

[0373]

[0374] [Table 7]

[0375] Table 7

[0376]

[0377] *In Comparative Example 1, the blade barely entered the side of the blade rubber end A, and even after entering, the blade separated from the blade rubber. The blade repeatedly entered from the separation position to cut the entire surface of the blade rubber.

[0378] [Table 8-1]

[0379] Table 8-1

[0380]

[0381] "Hairline": Very thin strips of wiping residue with a width of less than 0.5mm.

[0382] “Thicker lines”: Thin strips of wiping residue with a width of less than 1 mm.

[0383] "Wide lines": Strip-like wiping residue with a width of up to approximately 1 to 20 mm. This also includes several hairlines and thicker lines, as well as film-like wiping residue.

[0384] Note that in the above standard, it is defined that the wiping performance of each area is set to be equal to or less than the value shown in Table 8-2.

[0385] [Table 8-2]

[0386] Table 8-2

[0387]

[0388] [Table 9]

[0389] Table 9

[0390]

[0391] While the present disclosure has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

[0392] This application claims the benefit of Japanese Patent Application No. 2022-205749 filed on December 22, 2022, and Japanese Patent Application No. 2023-207474 filed on December 8, 2023, which are hereby incorporated by reference herein in their entirety.

Claims

1. A method for regenerating the scraper rubber of a scraper blade, wherein at least a portion of the scraper rubber forms a contact portion with the object to be wiped, The regeneration method comprises: Prepare scraper rubber for recycling; and A cutting blade is inserted into the scraper rubber from the side of the scraper rubber at one end A of the scraper rubber, and the cutting blade is moved relative to the scraper rubber toward the other end B of the scraper rubber to remove at least a portion of the contact portion, wherein The vibration frequency measured by using a sample sampled from the blade rubber to include at least a portion of the contact portion in an environment at a temperature of 24° C. is 1×10 3 The storage elastic modulus at Hz is 90.0 to 500.0 MPa, and The breaking stress of the sample measured in an environment with a temperature of 24° C. is 4.2 to 30.0 MPa.

2. The method for regenerating a scraper rubber according to claim 1, wherein The storage elastic modulus is 100.0 to 400.0 MPa, and The fracture stress is 8.0 to 28.0 MPa. 3 . The method for regenerating a scraper rubber according to claim 1 , wherein the scraper rubber comprises polyurethane.

4. The method for regenerating a scraper rubber according to claim 3, wherein When the detected amount of all ions obtained by heating a sample containing polyurethane sampled from the blade rubber to a temperature of 1000° C. at a heating rate of 10° C. / sec using a direct sample introduction type mass spectrometer in which sample molecules are heated and vaporized in an ionization chamber to be ionized is set as M1, The integrated intensity of the peak of the extracted ion thermogram corresponding to the range of m / z values derived from the polyfunctional isocyanate is set as M2, and When the integrated intensity of the peak of the extracted ion thermogram corresponding to the range of m / z values derived from diisocyanate is set as M3, M2 / M1 is 0.0010 to 0.0150, M3 / M1 is 0.0200 to 0.1100, and M2 / M3 is 0.0130 to 0.5000.

5. The method for regenerating a scraper rubber according to claim 3 or 4, wherein: When a sample taken from the blade rubber and containing the polyurethane is measured by pyrolysis GC / MS, a concentration of a component derived from a tri- or higher-functional polyfunctional alcohol in the polyurethane is 0.04 to 0.70 mmol / g.

6. The method for regenerating a scraper rubber according to any one of claims 3 to 5, wherein: The polyurethane is a cured product of a polyurethane raw material mixture including an isocyanate compound including a diisocyanate and a trifunctional or higher polyfunctional isocyanate and an alcohol including a trifunctional or higher polyfunctional alcohol.

7. The method for regenerating a scraper rubber according to claim 6, wherein The polyfunctional isocyanate is polymeric MDI, and M2 is the sum of the integrated intensities of the peaks of the extracted ion thermogram corresponding to the m / z value range of 380.5 to 381.5, the m / z value range of 511.5 to 512.5, the m / z value range of 642.5 to 643.5, and the m / z value range of 773.5 to 774.

5.

8. The method for regenerating a scraper rubber according to claim 6 or 7, wherein The diisocyanate is 4,4'-MDI, and M3 is the integrated intensity of the peak corresponding to the m / z value range of 249.5 to 250.

5.

9. The method for regenerating a scraper rubber according to claim 3, wherein: When the detected amount of all ions obtained by heating a sample containing polyurethane sampled from the blade rubber to a temperature of 1000° C. at a heating rate of 10° C. / sec using a direct sample introduction type mass spectrometer in which sample molecules are heated and vaporized in an ionization chamber to be ionized is set as M1, The integrated intensity of the peak of the extracted ion thermogram corresponding to the range of m / z values derived from trifunctional or higher polyfunctional isocyanates is defined as M2, and When the integrated intensity of the peak of the extracted ion thermogram corresponding to the range of m / z values derived from diisocyanate is set as M3, M2 / M1 is less than 0.0010.

10. The method for regenerating a scraper rubber according to claim 9, wherein: M2 / M1 is 0.0000 to 0.0008.

11. The method for regenerating a scraper rubber according to claim 9 or 10, wherein: M3 / M1 is 0.0900 to 0.2000.

12. The method for regenerating a scraper rubber according to any one of claims 9 to 11, wherein: When a sample taken from the blade rubber and containing the polyurethane is measured by pyrolysis GC / MS, a concentration of a component derived from a tri- or higher-functional polyfunctional alcohol in the polyurethane is 0.30 to 0.70 mmol / g.

13. The method for regenerating a scraper rubber according to any one of claims 9 to 12, wherein: The polyurethane is a cured product of a polyurethane raw material mixture including an isocyanate compound including a diisocyanate and an alcohol including a trifunctional or higher polyfunctional alcohol.

14. The method for regenerating a scraper rubber according to claim 13, wherein The diisocyanate comprises diphenylmethane diisocyanate, and The polyfunctional alcohol comprises trimethylolpropane.

15. The method for regenerating a scraper rubber according to any one of claims 1 to 14, wherein: The relative movement is movement along the length direction of the scraper rubber.

16. The method for regenerating a scraper rubber according to any one of claims 1 to 15, wherein In the blade rubber, the contact portion with the wiping object is formed to extend in the longitudinal direction. The cutting removes at least a portion of the contact portion by using a regeneration device, The regeneration device comprises: The blade portion of the cutting blade has at least a portion of the contact portion removed in the length direction. The clamping member of the scraper rubber, a biasing member that contacts the end B of the blade rubber and biases the blade rubber in the direction of the end A, and a pressing member that presses a tip end of the contact portion including the blade rubber in a lateral direction of the blade rubber to suppress elastic deformation due to movement of the blade portion, wherein The clamping member clamps at least a portion of the blade rubber from both sides of the blade rubber in a cross-sectional view perpendicular to the longitudinal direction of the blade rubber. The clamping member is provided at least at a position capable of clamping a portion of the blade rubber into which the blade portion enters, and the position of the clamping member relative to the blade rubber is fixed, and Before the blade portion moves relatively from the end portion A to the end portion B, the pressing member presses the blade rubber.

17. A method for producing recycled scraper rubber, The manufacturing method comprises: A blade rubber regenerated by the blade rubber regeneration method according to any one of claims 1 to 16 is obtained.

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