Rubber corrugated pipe for ocean equipment engineering and preparation method thereof

Abstract

The invention relates to the technical field of rubber corrugated pipe preparation, in particular to a rubber corrugated pipe for ocean equipment engineering and a preparation method thereof.The method comprises the steps that S1, recyclable raw materials of the rubber corrugated pipe are mixed and preprocessed, and an initial plasticized material is obtained; s2, adding a vulcanizing agent into the initial plasticized material, and stirring to obtain a pre-plasticized material; s3, carrying out vulcanizing agent uniformity detection and viscosity detection on the pre-plasticized material, and determining a vulcanization abnormal tendency type of the pre-plasticized material according to a detection result; s4, determining the subsequent preparation process of the rubber corrugated pipe according to the vulcanization abnormal tendency type of the pre-plasticized material; and S5, the initial pipe is put into a vulcanization bin to be vulcanized, and the rubber corrugated pipe is obtained. According to the preparation method of the rubber corrugated pipe, the vulcanization process is accurately controlled, so that the uniformity and the stability of the product are ensured, and the durability and the reliability of the rubber corrugated pipe in ocean equipment engineering are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of rubber bellows preparation, and in particular to a rubber bellows used in marine equipment engineering and a preparation method thereof. Background Art

[0002] The existing method for preparing rubber bellows has the problems of uneven mixing of vulcanizing agents and imprecise viscosity control. This causes the vulcanization reaction to proceed unevenly in the rubber material, resulting in inconsistencies in the physical properties of the product, such as strength, hardness and elasticity, in different areas, affecting the overall performance and stability of the product. Especially in marine equipment engineering, uneven vulcanization will reduce the durability and chemical resistance of the rubber bellows, and cannot meet the high requirements of the harsh marine environment.

[0003] Chinese Patent Publication No.: CN113090825A discloses a HDPE double-wall corrugated pipe and its preparation process, including a pipe head, a threaded ring, an outer pipe, an inner pipe, a truncated cone ring and a sleeve ring, the outer wall of the inner pipe is fixedly attached to the outer wall, the sleeve ring is fixedly attached to the right side of the outer wall of the outer pipe, the outer wall of the sleeve ring is integrally formed with the truncated cone ring, the left end of the inner pipe is integrally formed with the pipe head, and the outer wall of the pipe head is fixedly attached to the threaded ring; the inner pipe and the pipe head in the corrugated pipe are composed of polyvinyl chloride, nitrile rubber, pigment, talcum powder, and defoaming agent. The improved inner pipe and pipe head are not only flexible, but also flame retardant and anti-corrosion. The inner pipe can be bent and deformed, and the outer pipe maintains its original toughness.

[0004] However, the prior art still has the following problems: in actual situations, the physical properties of the vulcanized product do not meet the requirements due to uneven distribution of the vulcanizing agent during the rubber preparation process. Summary of the invention

[0005] To this end, the present invention provides a rubber bellows for marine equipment engineering and a preparation method thereof, so as to overcome the problem in the prior art that the physical properties of the vulcanized product do not meet the requirements due to uneven distribution of the vulcanizing agent during the rubber preparation process.

[0006] To achieve the above object, on the one hand, the present invention provides a method for preparing a rubber bellows for marine equipment engineering, comprising:

[0007] Step S1, mixing recyclable raw materials of the rubber bellows and pre-processing to obtain an initial plasticized material;

[0008] Step S2, adding a vulcanizing agent to the initial plasticized material and stirring to obtain a pre-plasticized material;

[0009] Step S3, performing a vulcanizing agent uniformity test and a viscosity test on the preplasticized material, and determining a vulcanization uniformity characterization parameter of the preplasticized material according to the test results to determine the type of abnormal vulcanization tendency of the preplasticized material;

[0010] Step S4, determining the subsequent preparation process of the rubber bellows according to the type of abnormal vulcanization tendency of the pre-plasticized material, including:

[0011] Adjust the processing parameters and stirring parameters of the initial plasticized material, and repeat steps S1 to S3;

[0012] Alternatively, the pre-plasticized material is extruded using the initial extrusion thickness, the edges are trimmed and then wound onto a carrier, the thickness of the tube body is tested, and when the thickness is uniform, a steel wire skeleton and an outer layer of rubber are wound, and then a protective film and a molding rope are coated to obtain an initial tube, and the coating uniformity of the initial tube is tested to determine whether the initial tube can be directly vulcanized;

[0013] Step S5, placing the initial tube into a vulcanization chamber for vulcanization to obtain a rubber bellows.

[0014] Furthermore, it is characterized in that, in the step S3, the uniformity of the vulcanizing agent is detected on the pre-plasticized material, including:

[0015] Sampling of pre-plasticized materials at different locations to test sulfur content;

[0016] Calculating the relative standard deviation of the sample to determine whether the vulcanizing agent in the pre-plasticized material is uniformly mixed;

[0017] Among them, the sampling method is stratified sampling.

[0018] Furthermore, it is characterized in that, in the step S3, the test results of the uniformity test of the vulcanizing agent and the test results of the viscosity test are used to determine the vulcanization uniformity characterization parameter of the pre-plasticized material, and the vulcanization uniformity characterization parameter is determined according to formula (1),

[0019]

[0020] In formula (1), s is the parameter characterizing the uniformity of sulfurization, n is the number of samplings, c0 is the average sulfur content of all samples, ci is the sulfur content of the i-th sampling sample, t is the flow time, and t0 is the standard flow time.

[0021] Further, it is characterized in that, in the step S3, the type of abnormal vulcanization tendency of the preplasticized material is determined according to the vulcanization uniformity characterization parameter of the preplasticized material, including:

[0022] If the vulcanization uniformity characterization parameter is greater than or equal to the standard vulcanization uniformity characterization parameter, the vulcanization abnormality tendency type of the preplasticized material is determined to be a dominant vulcanization abnormality type;

[0023] If the vulcanization uniformity characterization parameter is less than the standard vulcanization uniformity characterization parameter, it is determined that the vulcanization abnormality tendency type of the pre-plasticized material is a latent vulcanization abnormality type.

[0024] Further, it is characterized in that, in the step S4, the type of abnormal vulcanization tendency of the pre-plasticized material determines the subsequent preparation process of the rubber bellows, including:

[0025] If the abnormal vulcanization tendency type of the pre-plasticized material is the dominant abnormal vulcanization type, the subsequent preparation process is to adjust the processing parameters and stirring parameters of the initial plasticized material, and repeat steps S1 to S3;

[0026] If the abnormal vulcanization tendency type of the preplasticized material is a latent abnormal vulcanization type, the subsequent preparation process is to extrude the preplasticized material using the initial extrusion thickness, wind it onto a carrier after trimming the edges, detect the thickness of the tube body, wind a steel wire skeleton and an outer layer of rubber when the thickness is uniform, and then coat it with a protective film and a molding rope to obtain an initial tube, and perform a coating uniformity test on the initial tube to determine whether the initial tube can be directly vulcanized.

[0027] Further, it is characterized in that, in the step S4, the detecting the thickness of the tube body and judging whether the thickness is uniform comprises:

[0028] Divide the carrier into several detection segments and determine the midpoint of each detection segment;

[0029] Measure the width of each detection segment at the midpoint and determine the average width;

[0030] Apply pressure to the midpoint of each test section until the surface undergoes the same deformation, and record the pressure applied at each midpoint;

[0031] The internal uniformity parameter is calculated based on the test results. If the internal uniformity parameter is less than the standard internal uniformity parameter, the thickness is determined to be uniform.

[0032] Furthermore, it is characterized in that, in the step S4, the coating uniformity detection of the initial tube includes:

[0033] Detect the width interval between each loop of the forming rope and record it;

[0034] Detect the width of the midpoint between each circle and determine the average width of the bellows;

[0035] The winding uniformity parameters of the rubber bellows are calculated based on the coating uniformity test results.

[0036] Furthermore, it is characterized in that the winding uniformity parameter of the rubber bellows is determined according to formula (2):

[0037]

[0038] In formula (2), L2 is the winding uniformity parameter, m is the number of windings of the forming rope, lj is the width interval between the jth forming circles, l0 is the average width interval between each forming circle, d2 j is the width of the midpoint of the jth forming ring, d20 is the average width of the bellows.

[0039] Further, it is characterized in that determining whether the initial tube can be directly vulcanized comprises:

[0040] If the winding uniformity parameter of the rubber bellows is less than the standard winding uniformity parameter, the initial tube can be vulcanized;

[0041] If the winding uniformity parameter of the rubber bellows is greater than or equal to the standard winding uniformity parameter, the initial tube cannot be vulcanized.

[0042] On the other hand, the present invention also provides a rubber bellows for use in marine equipment engineering, wherein the recyclable raw materials of the rubber bellows include synthetic rubber, filler, plasticizer, anti-aging agent and processing aid.

[0043] Compared with the prior art, the beneficial effect of the present invention is that the present invention first mixes the recyclable raw materials and adds the vulcanizing agent for pre-processing, then detects the uniformity and viscosity of the vulcanizing agent on the pre-plasticized material, evaluates the type of abnormal vulcanization tendency by calculating the vulcanization uniformity characterization parameter, and selectively adjusts the processing parameters or directly performs the subsequent extrusion, winding and vulcanization steps according to the test results. The preparation method of the rubber bellows of the present invention effectively avoids the physical property differences caused by uneven vulcanization by accurately controlling the uniform distribution of the vulcanizing agent and the viscosity of the rubber, improves the stability and durability of the product, and meets the strict requirements of marine equipment engineering for high-performance rubber bellows. At the same time, the method optimizes the production process, improves production efficiency, reduces costs, and ensures the seawater resistance, salt spray resistance, UV resistance and heat resistance of the rubber bellows in the marine environment through targeted subsequent processing methods, thereby enhancing its reliability and service life in practical applications.

[0044] Furthermore, for preplasticized materials with different uniformity of vulcanizer, the performance of the obtained pipe body is different after vulcanization. If the vulcanizer is not evenly mixed in the preplasticized material, the concentration of the vulcanizer in different parts is inconsistent, resulting in uneven vulcanization reaction, which will make the physical properties of rubber products such as strength, hardness, elasticity, etc. inconsistent in different areas, resulting in unstable overall product performance. In addition, during the vulcanization process of rubber, the viscosity will affect the speed of the vulcanization reaction. Generally, rubber with higher viscosity will make the vulcanization reaction slower because it is more difficult for the cross-linking agent and vulcanizer to diffuse and react inside the rubber. Therefore, the vulcanization uniformity characterization parameters are determined based on the uniformity and viscosity of the vulcanizer to characterize the tendency of abnormal vulcanization of the preplasticized material, and then provide data support for the selection of subsequent processing procedures, so as to facilitate the adaptive selection of processing methods for different types of preplasticized materials in subsequent processing, thereby improving the quality of rubber bellows.

[0045] Furthermore, in the present invention, the subsequent preparation process of the rubber bellows is determined according to the type of abnormal vulcanization tendency of the preplasticized material, and different subsequent treatment methods are adopted for different types of preplasticized materials. The viscosity of the preplasticized material with high vulcanization uniformity characterization parameters does not meet the requirements or the vulcanizer is unevenly distributed, resulting in the rubber bellows obtained after direct vulcanization not meeting the requirements of the actual working environment; therefore, the processing parameters of the preplasticized material are adjusted to ensure that the preplasticized material for subsequent processing meets the requirements, providing a processing basis for the subsequent preparation of rubber bellows.

[0046] Furthermore, in actual situations, the viscosity of the pre-plasticized material with low vulcanization uniformity characterization parameters meets the requirements, the vulcanizer is evenly distributed, and it is easy to obtain a rubber bellows that meets the expectations during the vulcanization process. Therefore, for the pre-plasticized material in the above situation, whether the subsequent winding process meets the requirements is seriously considered, thereby ensuring that the final prepared rubber tube meets the requirements of marine equipment engineering in actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for preparing a rubber bellows for marine equipment engineering according to an embodiment of the present invention;

[0048] Figure 2 A logic diagram for determining the abnormal tendency type of vulcanization of pre-plasticized material according to an embodiment of the present invention;

[0049] Figure 3 A logic diagram for determining whether the thickness of a tube body is uniform according to an embodiment of the present invention;

[0050] Figure 4 A logic diagram for determining whether the initial pipe can be directly vulcanized according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0053] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0054] See also Figure 1 As shown, it is a flow chart of a method for preparing a rubber bellows for marine equipment engineering according to an embodiment of the present invention; the present invention provides a method for preparing a rubber bellows for marine equipment engineering, comprising:

[0055] Step S1, mixing recyclable raw materials of the rubber bellows and pre-processing to obtain an initial plasticized material;

[0056] Step S2, adding a vulcanizing agent to the initial plasticized material and stirring to obtain a pre-plasticized material;

[0057] Step S3, performing a vulcanizing agent uniformity test and a viscosity test on the preplasticized material, and determining a vulcanization uniformity characterization parameter of the preplasticized material according to the test results to determine the type of abnormal vulcanization tendency of the preplasticized material;

[0058] Step S4, determining the subsequent preparation process of the rubber bellows according to the type of abnormal vulcanization tendency of the pre-plasticized material, including:

[0059] Adjust the processing parameters and stirring parameters of the initial plasticized material, and repeat steps S1 to S3;

[0060] Alternatively, the pre-plasticized material is extruded using the initial extrusion thickness, the edges are trimmed and then wound onto a carrier, the thickness of the tube body is tested, and when the thickness is uniform, a steel wire skeleton and an outer layer of rubber are wound, and then a protective film and a molding rope are coated to obtain an initial tube, and the coating uniformity of the initial tube is tested to determine whether the initial tube can be directly vulcanized;

[0061] Step S5, placing the initial tube into a vulcanization chamber for vulcanization to obtain a rubber bellows.

[0062] In practice, the recyclable raw materials are mixed and pre-processed, including crushing the rubber recyclable raw materials, adding fillers, reinforcing agents and processing aids, and then sending the mixture into a grinder for grinding. After being processed by a plasticizer, a vulcanizer is added for stirring. Generally, the stirring time is 10 minutes to 20 minutes, the pre-processing temperature of the plasticizer is 120°C to 140°C, and the plasticizing time is 10 minutes to 20 minutes.

[0063] The carrier is generally a rotating shaft or mandrel made of metal. Lubricating oil is applied to the surface of the carrier before winding the rubber to reduce the friction coefficient between the rubber material and the carrier, making it easier for the rubber to adhere evenly during the winding process and facilitating the detachment of the rubber bellows from the carrier.

[0064] The present invention first mixes recyclable raw materials and adds a vulcanizing agent for pre-processing, then detects the uniformity and viscosity of the vulcanizing agent on the pre-plasticized material, evaluates the type of abnormal vulcanization tendency by calculating the vulcanization uniformity characterization parameter, and selectively adjusts the processing parameters or directly performs subsequent extrusion, winding and vulcanization steps according to the test results. The rubber bellows preparation method of the present invention effectively avoids the physical property differences caused by uneven vulcanization by accurately controlling the uniform distribution of the vulcanizing agent and the viscosity of the rubber, improves the stability and durability of the product, and meets the strict requirements of marine equipment engineering for high-performance rubber bellows. At the same time, the method optimizes the production process, improves production efficiency, reduces costs, and ensures the seawater resistance, salt spray resistance, UV resistance and heat resistance of the rubber bellows in the marine environment through targeted subsequent processing methods, thereby enhancing its reliability and service life in practical applications.

[0065] In addition, the use of recycled materials in the manufacturing process can not only save resources and reduce damage to the environment, but also reduce production costs and promote the development of a circular economy. At the same time, by reducing waste generation and pollution emissions, it also helps to reduce the pressure on the garbage disposal system and reduce greenhouse gas emissions.

[0066] See also Figure 2 As shown, it is a logic diagram for determining the type of abnormal vulcanization tendency of pre-plasticized material according to an embodiment of the present invention. In the step S3, the uniformity of the vulcanizing agent is detected on the pre-plasticized material, including:

[0067] Sampling of pre-plasticized materials at different locations to test sulfur content;

[0068] Calculating the relative standard deviation of the sample to determine whether the vulcanizing agent in the pre-plasticized material is uniformly mixed;

[0069] Among them, the sampling method is stratified sampling.

[0070] In practice, the sulfur content of the sample is determined by solvent extraction, and the content and distribution of the vulcanizer are determined by chemical analysis methods after the rubber sample is dissolved in an appropriate solvent. Generally, the sulfur content in rubber bellows used in marine equipment engineering is relatively high. Considering the corrosiveness of seawater, the content of vulcanizer in rubber bellows used in marine engineering is preferably 50 mg / g to 150 mg / g to ensure that the rubber material has sufficient durability and chemical resistance.

[0071] Viscosity testing can be done by measuring the viscosity cup, which is used to measure the flow time of rubber at a fixed temperature and record it.

[0072] Specifically, in step S3, the test results of the vulcanizing agent uniformity test and the viscosity test are used to determine the vulcanization uniformity characterization parameter of the pre-plasticized material. The vulcanization uniformity characterization parameter is determined according to formula (1):

[0073]

[0074] In formula (1), s is the parameter characterizing the uniformity of sulfurization, n is the number of samplings, c0 is the average sulfur content of all samples, ci is the sulfur content of the i-th sampling sample, t is the flow time, and t0 is the standard flow time.

[0075] In practice, the standard flow time is determined based on the flow time of qualified rubber bellows tested during the production process in historical production records.

[0076] Specifically, in the step S3, the type of abnormal vulcanization tendency of the preplasticized material is determined according to the vulcanization uniformity characterization parameter of the preplasticized material, including:

[0077] If the vulcanization uniformity characterization parameter is greater than or equal to the standard vulcanization uniformity characterization parameter, the vulcanization abnormality tendency type of the preplasticized material is determined to be a dominant vulcanization abnormality type;

[0078] If the vulcanization uniformity characterization parameter is less than the standard vulcanization uniformity characterization parameter, it is determined that the vulcanization abnormality tendency type of the pre-plasticized material is a latent vulcanization abnormality type.

[0079] In practice, the standard vulcanization uniformity characterization parameter is selected within [0.3,0.4].

[0080] For preplasticized materials with different uniformity of vulcanizer, the performance of the obtained pipe body is different after vulcanization. If the vulcanizer is not evenly mixed in the preplasticized material, the concentration of the vulcanizer in different parts is inconsistent, resulting in uneven vulcanization reaction, which will make the physical properties of rubber products such as strength, hardness, elasticity, etc. inconsistent in different areas, resulting in unstable overall performance of the product. In addition, during the vulcanization process of rubber, the viscosity will affect the speed of the vulcanization reaction. Normally, rubber with higher viscosity will make the vulcanization reaction slower because it is more difficult for the cross-linking agent and vulcanizer to diffuse and react inside the rubber. Therefore, the vulcanization uniformity characterization parameters are determined based on the uniformity and viscosity of the vulcanizer to characterize the tendency of abnormal vulcanization of the preplasticized material, and then provide data support for the selection of subsequent processing procedures, facilitate the adaptive processing methods of different types of preplasticized materials in subsequent processing, and improve the quality of rubber bellows.

[0081] Specifically, in step S4, the type of abnormal vulcanization tendency of the pre-plasticized material determines the subsequent preparation process of the rubber bellows, including:

[0082] If the abnormal vulcanization tendency type of the pre-plasticized material is the dominant abnormal vulcanization type, the subsequent preparation process is to adjust the processing parameters and stirring parameters of the initial plasticized material, and repeat steps S1 to S3;

[0083] If the abnormal vulcanization tendency type of the preplasticized material is a latent abnormal vulcanization type, the subsequent preparation process is to extrude the preplasticized material using the initial extrusion thickness, wind it onto a carrier after trimming the edges, detect the thickness of the tube body, wind a steel wire skeleton and an outer layer of rubber when the thickness is uniform, and then coat it with a protective film and a molding rope to obtain an initial tube, and perform a coating uniformity test on the initial tube to determine whether the initial tube can be directly vulcanized.

[0084] In practice, for pre-plasticized materials with obvious abnormal vulcanization, the processing parameters are adjusted to increase the stirring time to 1.5 times the original processing time;

[0085] If t-t0>0, increase the processing temperature of the plasticizer, the temperature does not exceed 140℃, if it has reached the maximum temperature, increase the plasticizing time;

[0086] If t-t0<0, reduce the processing temperature of the plasticizer, the temperature should not be lower than 120℃. If the lowest temperature has been reached, reduce the plasticizing time.

[0087] In the present invention, the subsequent preparation process of the rubber bellows is determined according to the type of abnormal vulcanization tendency of the preplasticized material, and different subsequent treatment methods are adopted for different types of preplasticized materials. The viscosity of the preplasticized material with high vulcanization uniformity characterization parameter meets the requirements or the vulcanizing agent is unevenly distributed, resulting in the rubber bellows obtained after direct vulcanization not meeting the requirements of the actual working environment;

[0088] During the vulcanization process of rubber, viscosity affects the rate of vulcanization reaction. Generally, higher viscosity rubber will make the vulcanization reaction proceed more slowly because it is more difficult for the crosslinking agent and the vulcanizing agent to diffuse and react inside the rubber. For pre-plasticized materials with uneven distribution of vulcanizing agents, there may be too much crosslinking agent in some areas during the vulcanization process, while other areas may not be crosslinked enough, which will lead to uneven physical properties in some areas of the rubber after vulcanization; uneven distribution of vulcanizing agents may lead to insufficient rubber strength and durability in some areas because insufficient crosslinking density will make these areas more prone to stretching or wear; areas with too much vulcanizing agent may have higher hardness, while areas with insufficient vulcanizing agent may have lower hardness, resulting in uneven overall hardness;

[0089] Therefore, adjusting the processing parameters of the pre-plasticized material is necessary to ensure that the pre-plasticized material for subsequent processing meets the requirements and provide a processing basis for the subsequent preparation of rubber bellows.

[0090] See also Figure 3 As shown, it is a logic diagram of determining whether the thickness of the tube body is uniform according to an embodiment of the present invention. In the step S4, the thickness of the tube body is detected and the determination of whether the thickness is uniform includes:

[0091] Divide the carrier into several detection segments and determine the midpoint of each detection segment;

[0092] Measure the width of each detection segment at the midpoint and determine the average width;

[0093] Apply pressure to the midpoint of each test section until the surface undergoes the same deformation, and record the pressure applied at each midpoint;

[0094] The internal uniformity parameter is calculated based on the test results. If the internal uniformity parameter is less than the standard internal uniformity parameter, the thickness is determined to be uniform.

[0095] In implementation, the number of detection segments is preferably 10, and the carrier can be divided into a number of identical detection segments by a visual detection device, the midpoint of each detection segment is determined, and the width at the midpoint of each detection segment is measured. This is a prior art and will not be described in detail.

[0096] It is understandable that if the thickness of the rubber is uneven at different locations, the thinner locations will require less pressure to produce the same amount of deformation, because in these locations, the rubber material is more susceptible to deformation by external forces.

[0097] The internal uniformity parameter is determined according to formula (3):

[0098]

[0099] In formula (3), L1 is the internal uniform parameter, a is the total number of detection segments, fb is the pressure applied at the midpoint of the bth detection segment, f0 is the average pressure applied at the midpoint of the detection segment, d1 b is the width of the midpoint of the bth detection segment, and d10 is the average width of the detection segment.

[0100] See also Figure 4 As shown, it is a logic diagram for determining whether the initial tube can be directly vulcanized according to an embodiment of the present invention. In the step S4, the coating uniformity detection of the initial tube includes:

[0101] Detect the width interval between each loop of the forming rope and record it;

[0102] Detect the width of the midpoint between each circle and determine the average width of the bellows;

[0103] The winding uniformity parameters of the rubber bellows are calculated based on the coating uniformity test results.

[0104] In practice, the width intervals between the circles of the formed rope and the width corresponding to the midpoint of each circle are also obtained through visual inspection equipment. This is a prior art and will not be described in detail.

[0105] Specifically, the winding uniformity parameter of the rubber bellows is determined according to formula (2):

[0106]

[0107] In formula (2), L2 is the winding uniformity parameter, m is the number of windings of the forming rope, lj is the width interval between the jth forming circles, l0 is the average width interval between each forming circle, d2 j is the width of the midpoint of the jth forming ring, d20 is the average width of the bellows.

[0108] Specifically, determining whether the initial pipe can be directly vulcanized includes,

[0109] If the winding uniformity parameter of the rubber bellows is less than the standard winding uniformity parameter, the initial tube can be vulcanized;

[0110] If the winding uniformity parameter of the rubber bellows is greater than or equal to the standard winding uniformity parameter, the initial tube cannot be vulcanized.

[0111] In practice, the winding uniformity parameter of the standard rubber bellows is selected in the interval [0.1, 0.3]. Generally, the wider the diameter of the rubber bellows required for marine equipment engineering, the larger the value of the winding uniformity parameter of the standard rubber bellows.

[0112] When the initial tube cannot be vulcanized, the initial extrusion thickness of the preplasticized material can be reduced, the wound preplasticized material can be made thinner, or the tension applied to the preplasticized material during winding can be increased.

[0113] In the present invention, in actual conditions, the viscosity of the pre-plasticized material with low vulcanization uniformity characterization parameters meets the requirements, the vulcanizer is evenly distributed, and it is easy to obtain a rubber bellows that meets the expectations during the vulcanization process. Therefore, for the pre-plasticized material in the above situation, it is detected whether the subsequent winding process meets the requirements, thereby ensuring that the final prepared rubber tube meets the requirements of marine equipment engineering in actual applications.

[0114] The present invention also provides a rubber bellows for marine equipment engineering, wherein the recyclable raw materials of the rubber bellows include synthetic rubber, filler, plasticizer, anti-aging agent and processing aid. The processing aid includes initiator, vulcanizer and wood powder surface treatment agent; the filler is wood powder, and may also include carbon black, silica powder, etc., which is used to adjust the hardness of the rubber and enhance the tensile strength and wear resistance.

[0115] The raw material composition is calculated by weight:

[0116] Recycled tire devulcanized rubber powder: 100 parts

[0117] Wood powder: 5-50 parts

[0118] Wood powder surface treatment agent: 2-15 parts

[0119] Chlorinated rubber: 1-30 parts

[0120] Initiator: 0.5-3.0 parts

[0121] Vulcanizing agent: 0.05-0.08 parts

[0122] Plasticizer: 10-20 parts

[0123] Anti-aging agent: 3 parts

[0124] Recycled tire desulfurized rubber powder is obtained by treating recycled tires with vacuum desulfurization technology. Wood powder is a powder obtained by mechanically crushing biomass materials (such as wood, bamboo, rice husks and straw) and passing through an 80-200 mesh sieve. The surface treatment agent for wood powder can be one or more of isocyanate, silane coupling agent, aluminate coupling agent, titanate coupling agent or stearic acid.

[0125] The chlorinated rubber is obtained by chlorination treatment of recycled tire devulcanized rubber powder, and the chlorine content is greater than 15wt%. The initiator can be benzoyl peroxide, di-tert-butyl peroxide or azobisisobutyronitrile.

[0126] In practical applications, considering the needs of marine equipment engineering, synthetic rubber can also be selected to be resistant to seawater, salt spray, UV and heat, such as chloroprene rubber (CR), ethylene propylene rubber (EPDM), fluororubber (FKM), silicone rubber (VMQ), etc. When used, the mass fraction is the same as the recycled tire devulcanized rubber powder;

[0127] Plasticizers, such as phthalates (DOP, DINP) or paraffin wax, are used to adjust the softness and processing properties of rubber;

[0128] Anti-aging agents include aromatic amine compounds, such as TMQ and 6PPD, and light stabilizers, such as HALS and UVAbsorbers, which are used to protect rubber from environmental factors.

[0129] The vulcanizing agent is preferably an organic vulcanizing agent, such as triallyl isocyanurate or m-phenylene bismaleimide.

[0130] If the preparation method of the rubber bellows for marine equipment engineering of the present invention is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0131] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0132] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a rubber bellows for marine equipment engineering, characterized in that: include: Step S1, mixing recyclable raw materials of the rubber bellows and pre-processing to obtain an initial plasticized material; Step S2, adding a vulcanizing agent to the initial plasticized material and stirring to obtain a pre-plasticized material; Step S3, performing a vulcanizing agent uniformity test and a viscosity test on the preplasticized material, and determining a vulcanization uniformity characterization parameter of the preplasticized material according to the test results to determine the type of abnormal vulcanization tendency of the preplasticized material; Step S4, determining the subsequent preparation process of the rubber bellows according to the type of abnormal vulcanization tendency of the pre-plasticized material, including: Adjust the processing parameters and stirring parameters of the initial plasticized material, and repeat steps S1 to S3; Alternatively, the pre-plasticized material is extruded using the initial extrusion thickness, the edges are trimmed and then wound onto a carrier, the thickness of the tube body is tested, and when the thickness is uniform, a steel wire skeleton and an outer layer of rubber are wound, and then a protective film and a molding rope are coated to obtain an initial tube, and the coating uniformity of the initial tube is tested to determine whether the initial tube can be directly vulcanized; Step S5, placing the initial tube into a vulcanization chamber for vulcanization to obtain a rubber bellows.

2. The method for preparing a rubber bellows for marine equipment engineering according to claim 1, characterized in that: In the step S3, the uniformity of the vulcanizing agent is detected on the pre-plasticized material, including: Sampling of pre-plasticized materials at different locations to test sulfur content; Calculating the relative standard deviation of the sample to determine whether the vulcanizing agent in the pre-plasticized material is uniformly mixed; Among them, the sampling method is stratified sampling.

3. The method for preparing a rubber bellows for marine equipment engineering according to claim 2, characterized in that: In step S3, the vulcanization uniformity characterization parameter is determined according to formula (1): In formula (1), s is the parameter characterizing the uniformity of sulfurization, n is the number of samplings, c0 is the average sulfur content of all samples, ci is the sulfur content of the i-th sampling sample, t is the flow time, and t0 is the standard flow time.

4. The method for preparing a rubber bellows for marine equipment engineering according to claim 3, characterized in that: In the step S3, the type of abnormal vulcanization tendency of the preplasticized material is determined according to the vulcanization uniformity characterization parameter of the preplasticized material. include, If the vulcanization uniformity characterization parameter is greater than or equal to the standard vulcanization uniformity characterization parameter, the vulcanization abnormality tendency type of the preplasticized material is determined to be a dominant vulcanization abnormality type; If the vulcanization uniformity characterization parameter is less than the standard vulcanization uniformity characterization parameter, it is determined that the vulcanization abnormality tendency type of the pre-plasticized material is a latent vulcanization abnormality type.

5. The method for preparing a rubber bellows for marine equipment engineering according to claim 4, characterized in that: In the step S4, the type of abnormal vulcanization tendency of the pre-plasticized material determines the subsequent preparation process of the rubber bellows, including: If the abnormal vulcanization tendency type of the pre-plasticized material is the dominant abnormal vulcanization type, the subsequent preparation process is to adjust the processing parameters and stirring parameters of the initial plasticized material, and repeat steps S1 to S3; If the abnormal vulcanization tendency type of the preplasticized material is a latent abnormal vulcanization type, the subsequent preparation process is to extrude the preplasticized material using the initial extrusion thickness, wind it onto a carrier after trimming the edges, detect the thickness of the tube body, wind a steel wire skeleton and an outer layer of rubber when the thickness is uniform, and then coat it with a protective film and a molding rope to obtain an initial tube, and perform a coating uniformity test on the initial tube to determine whether the initial tube can be directly vulcanized.

6. The method for preparing a rubber bellows for marine equipment engineering according to claim 5, characterized in that: In step S4, the detecting the thickness of the tube body and judging whether the thickness is uniform includes: Divide the carrier into several detection segments and determine the midpoint of each detection segment; Measure the width of each detection segment at the midpoint and determine the average width; Apply pressure to the midpoint of each test section until the surface undergoes the same deformation, and record the pressure applied at each midpoint; The internal uniformity parameter is calculated based on the test results. If the internal uniformity parameter is less than the standard internal uniformity parameter, the thickness is determined to be uniform.

7. The method for preparing a rubber bellows for marine equipment engineering according to claim 6, characterized in that: In step S4, the coating uniformity test of the initial tube includes: Detect the width interval between each loop of the forming rope and record it; Detect the width of the midpoint between each circle and determine the average width of the bellows; The winding uniformity parameters of the rubber bellows are calculated based on the coating uniformity test results.

8. The method for preparing a rubber bellows for marine equipment engineering according to claim 7, characterized in that: The winding uniformity parameter of the rubber bellows is determined according to formula (2): In formula (2), L2 is the winding uniformity parameter, m is the number of windings of the forming rope, lj is the width interval between the jth forming circles, l0 is the average width interval between each forming circle, d2 j is the width of the midpoint of the jth forming ring, d20 is the average width of the bellows.

9. The method for preparing a rubber bellows for marine equipment engineering according to claim 8, characterized in that: Determine whether the initial tube can be vulcanized directly, including, If the winding uniformity parameter of the rubber bellows is less than the standard winding uniformity parameter, the initial tube can be vulcanized; If the winding uniformity parameter of the rubber bellows is greater than or equal to the standard winding uniformity parameter, the initial tube cannot be vulcanized.

10. A rubber bellows used in the method for preparing a rubber bellows for marine equipment engineering according to any one of claims 1 to 9, characterized in that: The recyclable raw materials of rubber bellows include synthetic rubber, fillers, plasticizers, antioxidants and processing aids.

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