Resin composition, sliding film as coated article of resin composition, and jig having sliding film of resin composition

Abstract

To provide a resin composition which enables formation of a sliding film that is a one-pack type and is excellent in storage stability under ordinary temperature, is excellent in adhesion to a surface part of a jig and workpiece and followability to the surface part of the jig, when the workpiece is mounted on the surface part of the jig and is subjected to working processing, and a secondary product is prepared from the workpiece, and gives excellent slidability to the surface part of the jig.SOLUTION: A resin composition for forming a sliding film between a jig having a surface part and workpiece mounted on the surface part of the jig, on the surface of the jig contains a silicone-based resin having a main chain of silicone, and an organic solvent.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a resin composition for forming a slide coating on a surface of a jig between the jig having a surface portion and a workpiece to be attached to the surface portion of the jig, a slide coating which is a coating of the resin composition, and a jig having a slide coating of the resin composition on the surface portion to which the workpiece is attached. [Background technology]

[0002] Conventionally, the sliding property of a sliding member, the surface of which slides against another member, has been imparted with excellent sliding property to improve the sliding property of the sliding member. In order to impart excellent sliding property to the surface of a sliding member, for example, a resin composition for forming a lubricating film containing a thermosetting binder resin, a solid lubricant, and microcapsules, the microcapsules containing a liquid lubricant in a resin film, and the binder resin is mainly composed of a fluoroolefin vinyl ether polymer resin and / or a fluoroolefin vinyl ether vinyl ester copolymer resin, has been proposed (Patent Document 1).

[0003] Patent Document 1 describes how, when a lubricating coating formed from a resin composition for forming a lubricating coating is used as a sliding surface and the surface is slid, the microcapsules exposed in the lubricating coating break down due to friction with the mating material, allowing the liquid lubricant to flow out and cover the sliding surface, thereby providing good lubrication.

[0004] On the other hand, when obtaining a secondary product by processing a primary product, the primary product to be processed (i.e., the workpiece) may be attached to the surface of a tool and processed to prepare the secondary product. The prepared secondary product can be obtained by removing it from the surface of the tool.

[0005] Depending on the material of the surface part of the jig and the material of the workpiece, the frictional force between the surface part of the jig and the primary product and the frictional force between the surface part of the jig and the secondary product may be large. If the frictional force between the surface part of the jig and the primary product and the frictional force between the surface part of the jig and the secondary product are large, the burden on the worker increases when attaching the primary product to the surface part of the jig or removing the secondary product from the surface part of the jig, the working time increases, and the processing efficiency of the workpiece may decrease. In particular, when the surface part of the jig is an elastic body such as a rubber member and the workpiece is rubber, the frictional force between the surface part of the jig and the workpiece and the frictional force between the surface part of the jig and the secondary product tend to be large.

[0006] Therefore, when processing a workpiece on the surface of a jig, it has been considered to form a coating with excellent sliding properties on the surface of the jig. However, in the resin composition for forming a lubricating coating of Patent Document 1, the liquid lubricant flows out and covers the sliding surface, so there is a problem that the secondary product is contaminated with the liquid lubricant. Furthermore, in Patent Document 1, there is room for improvement in reducing the frictional force between the surface of the jig and the primary product and between the surface of the jig and the secondary product, especially when the surface of the jig is a rubber member and the workpiece is rubber.

[0007] In addition, the resin composition for forming a coating on the surface of the jig is required to be a one-liquid type and have excellent storage stability at room temperature from the viewpoint of processing efficiency of the workpiece, in addition to being able to form a coating with excellent sliding properties with reduced friction, i.e., a sliding coating. Furthermore, in particular, when a secondary product is obtained by cutting a primary product using a blade, the sliding coating on the surface of the jig formed from the resin composition is further required to have adhesion to the surface of the jig. Furthermore, in particular, when the surface of the workpiece and the jig are elastic members, the sliding coating on the surface of the jig formed from the resin composition is further required to have conformity to the surface of the workpiece and the jig. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2003-73609 A Summary of the Invention [Problem to be solved by the invention]

[0009] In view of the above circumstances, the present invention has an object to provide a one-component resin composition which has excellent storage stability at room temperature, which has excellent adhesion to the surface of a jig and excellent followability to the surfaces of a workpiece and the jig when a workpiece is attached to the surface of the jig and processed to prepare a secondary product from the workpiece, and which is capable of forming a sliding coating which imparts excellent sliding properties to the surface of the jig, a sliding coating which is a coating of the resin composition, and a jig having a sliding coating of the resin composition. [Means for solving the problem]

[0010] The gist of the configuration of the present invention is as follows. [1] A resin composition for forming a sliding coating on a surface of a jig between a jig having a surface portion and a workpiece to be attached to the surface portion of the jig, A resin composition comprising a silicone-based resin having a silicone main chain and an organic solvent. [2] The resin composition according to [1], wherein the silicone-based resin has a side chain of a polymer containing acrylic and / or a polymer containing vinyl acetate. [3] The resin composition according to [1] or [2], wherein the polymer containing acrylic is a graft polymer of acrylic, and the polymer containing vinyl acetate is a graft polymer of vinyl acetate. [4] The resin composition according to [1] or [2], wherein the silicone content of the silicone-based resin is 50% by mass or more and 95% by mass or less. [5] The resin composition according to [1] or [2], wherein the silicone-based resin is a powder having an average secondary particle diameter of 1.0 μm to 500 μm and / or the silicone-based resin is an oil-in-water (O / W) emulsion, is dissolved or dispersed in the organic solvent to form the resin composition. [6] The resin composition according to [1] or [2], wherein the organic solvent is at least one selected from the group consisting of hydrocarbons, esters, ketones and amides. [7] The resin composition according to [1] or [2], wherein the organic solvent comprises a ketone. [8] The resin composition according to [1] or [2], wherein the organic solvent contains methyl ethyl ketone. [9] The resin composition according to [1] or [2], wherein the content of the silicone-based resin in 100% by mass of the resin composition is 1.0% by mass or more and 10% by mass or less.

[10] The resin composition according to [1] or [2], wherein the content of the silicone-based resin in 100% by mass of the resin composition is 3.5% by mass or more and 6.5% by mass or less.

[11] The resin composition according to [1] or [2], wherein the surface of the jig is made of an elastic material and the workpiece is made of rubber.

[12] The resin composition according to

[11] , wherein the elastic body is a rubber material.

[13] The resin composition according to

[11] , wherein the elastic body is a heat shrink tube.

[14] A sliding coating which is a coating of the resin composition according to [1] or [2].

[15] The slide coating according to

[14] , wherein the static friction coefficient of the surface of the slide coating is greater than its kinetic friction coefficient, the static friction coefficient being 0.05 or more and 0.15 or less, and the kinetic friction coefficient being 0.03 or more and 0.13 or less.

[16] A jig having a slide coating formed from the resin composition according to [1] or [2] on a surface portion to which a workpiece is attached.

[17] The jig according to

[16] , wherein the static friction coefficient of the surface of the slide coating is greater than the kinetic friction coefficient, the static friction coefficient being 0.05 or more and 0.15 or less, and the kinetic friction coefficient being 0.03 or more and 0.13 or less. Effect of the Invention

[0011] According to an aspect of the resin composition of the present invention, the resin composition is for forming a coating on a surface of a jig between a jig having a surface portion and a workpiece to be attached to the surface portion of the jig, and contains a silicone-based resin having a silicone main chain and an organic solvent, and is therefore a one-liquid resin composition with excellent storage stability at room temperature. Furthermore, when the workpiece is attached to the surface portion of the jig and processed to prepare a secondary product from the workpiece, a sliding coating can be formed that has excellent adhesion to the surface portion of the jig and excellent followability to the surface portion of the workpiece and the jig, and that imparts excellent sliding properties to the surface portion of the jig.

[0012] By applying the resin composition of the present invention to the surface of a jig to which a workpiece is attached, a sliding coating is formed that has excellent adhesion to the surface of the jig and conformability to the surfaces of the workpiece and the jig.

[0013] According to an embodiment of the resin composition of the present invention, the silicone-based resin has side chains of an acrylic-containing polymer and / or a vinyl acetate-containing polymer, thereby reliably improving adhesion to the surface of a jig and conformability to the surfaces of the workpiece and the jig.

[0014] According to an embodiment of the resin composition of the present invention, the polymer containing acrylic is a graft polymer of acrylic, and the polymer containing vinyl acetate is a graft polymer of vinyl acetate, thereby further reliably improving adhesion to the surface of a jig and conformability to the surfaces of the workpiece and the jig.

[0015] According to an embodiment of the resin composition of the present invention, the silicone content of the silicone-based resin is from 50% by mass to 95% by mass, whereby the adhesion of the slide coating formed from the resin composition to the surface of a jig, the conformability to the surface of the workpiece and the jig, and the slideability of the surface of the jig are improved in a well-balanced manner.

[0016] According to an embodiment of the resin composition of the present invention, the organic solvent is at least one selected from the group consisting of hydrocarbons, esters, ketones, and amides, thereby improving the solubility or dispersibility of the silicone resin in the resin composition and ensuring a one-component composition.

[0017] According to an aspect of the resin composition of the present invention, the organic solvent contains a ketone, which further improves the solubility or dispersibility of the silicone resin in the resin composition, making it possible to more reliably form a one-component resin.

[0018] According to the embodiment of the resin composition of the present invention, the organic solvent contains methyl ethyl ketone, so that the silicone resin in the resin composition has excellent solubility, and the resin composition can be made into a one-component type more reliably. In addition, the organic solvent contains methyl ethyl ketone, so that the storage stability of the resin composition at room temperature is further improved.

[0019] According to an embodiment of the resin composition of the present invention, the content of the silicone-based resin in 100% by mass of the resin composition is 1.0% by mass or more and 10% by mass or less, whereby the frictional force between the surface of the jig and the workpiece and the frictional force between the surface of the jig and the secondary product are reliably reduced, and a coating with excellent sliding properties can be obtained.

[0020] According to an embodiment of the resin composition of the present invention, the content of the silicone-based resin in 100% by mass of the resin composition is 3.5% by mass or more and 6.5% by mass or less, whereby the frictional force between the surface of the jig and the workpiece and the frictional force between the surface of the jig and the secondary product are further reduced, making it possible to obtain a coating with even better sliding properties.

[0021] According to the slide coating which is a coating of the resin composition of the present invention, the static friction coefficient of the surface of the slide coating is larger than the kinetic friction coefficient, and the static friction coefficient is 0.05 or more and 0.15 or less, and the kinetic friction coefficient is 0.03 or more and 0.13 or less, thereby making it possible to improve in a balanced manner the attachability of the workpiece to the surface part having the slide coating, the fixing stability of the workpiece attached to the surface part having the slide coating, the removability when removing a secondary product from the surface part having the slide coating, and the sliding property between the workpiece and the secondary product.

[0022] According to a jig having a sliding coating formed from the resin composition of the present invention on its surface to which a workpiece is attached, the static friction coefficient of the surface of the sliding coating is greater than the kinetic friction coefficient, the static friction coefficient being 0.05 or more and 0.15 or less, and the kinetic friction coefficient being 0.03 or more and 0.13 or less, thereby making it possible to improve in a balanced manner the attachability of the workpiece to the surface of the jig, the fixing stability of the workpiece attached to the surface of the jig, the removability of a secondary product when it is removed from the surface of the jig, and the sliding property between the workpiece and the secondary product. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] (1) Resin composition The constitution of the resin composition of the present invention will be described in detail below. The resin composition of the present invention contains a silicone-based resin having a silicone main chain and an organic solvent. The resin composition of the present invention is a liquid composition in which the silicone-based resin is dissolved or dispersed in an organic solvent. The resin composition of the present invention is a resin composition for forming a sliding coating on the surface of the jig between a jig having a surface portion and a workpiece (primary product) attached to the surface portion of the jig. Therefore, by applying the resin composition of the present invention to the surface portion of the jig, a sliding coating is formed on the surface portion of the jig. Also, by attaching the workpiece to the surface portion of the jig, the sliding coating formed by applying the resin composition of the present invention is located between the surface portion of the jig and the workpiece.

[0024] The resin composition of the present invention is a one-component type by containing a silicone-based resin having a silicone main chain and an organic solvent, and is excellent in storage stability at room temperature.Furthermore, the resin composition of the present invention containing a silicone-based resin having a silicone main chain and an organic solvent is a resin composition for forming a coating on the surface of the jig between a jig having a surface portion and a workpiece attached to the surface portion of the jig, so that when the workpiece is attached to the surface portion of the jig and processed to prepare a secondary product from the workpiece, the resin composition can form a sliding coating that has excellent adhesion to the surface portion of the jig and excellent followability to the surface portion of the workpiece and the jig, and also has excellent sliding properties on the surface portion of the jig.

[0025] The components of the resin composition of the present invention will be described below.

[0026] <Silicone resin> The silicone resin is not particularly limited as long as it is a resin having a silicone main chain, but from the viewpoint of reliably improving the adhesion to the surface of the jig and the conformability to the surface of the workpiece and the jig, a chemical structure having a silicone main chain and a side chain of a polymer containing acrylic and / or a polymer containing vinyl acetate is preferred, and from the viewpoint of further reliably improving the adhesion to the surface of the jig and the conformability to the surface of the workpiece and the jig, it is particularly preferred that the polymer containing acrylic is an acrylic graft polymer, and it is particularly preferred that the polymer containing vinyl acetate is a vinyl acetate graft polymer. That is, a chemical structure having a silicone main chain and a side chain of an acrylic graft polymer and / or a vinyl acetate graft polymer is particularly preferred.

[0027] The silicone content of the silicone resin, i.e., the content of the silicone forming the main chain in 100% by mass of the silicone resin, is not particularly limited, but the lower limit is preferably 50% by mass from the viewpoint of reliably imparting excellent sliding properties to the surface of the jig, and particularly preferably 60% by mass from the viewpoint of imparting even more excellent sliding properties to the surface of the jig. On the other hand, the upper limit of the content of the silicone forming the main chain in 100% by mass of the silicone resin is preferably 95% by mass from the viewpoint of reliably imparting adhesion to the surface of the jig and conformability to the surface of the workpiece and the jig, and more preferably 90% by mass and particularly preferably 85% by mass from the viewpoint of reliably imparting excellent adhesion to the surface of the jig and excellent conformability to the surface of the workpiece and the jig.

[0028] From the above, the silicone content of the silicone-based resin is preferably from 50% by mass to 95% by mass in order to achieve a well-balanced improvement in the adhesion of the slide coating formed from the resin composition to the surface portion of the jig, the conformability to the surface portion of the workpiece and the jig, and the slidability of the surface portion of the jig; from the viewpoint of a further well-balanced improvement in the adhesion of the slide coating to the surface portion of the jig, the conformability to the surface portion of the workpiece and the jig, and the slidability of the surface portion of the jig, the silicone content is more preferably from 60% by mass to 90% by mass, and particularly preferably from 60% by mass to 85% by mass.

[0029] The form of the silicone resin before being dissolved or dispersed in an organic solvent is not particularly limited, but examples thereof include a silicone resin in powder form, a silicone resin in emulsion form, etc. The silicone resin in powder form and the silicone resin in emulsion form may be used alone, or both may be used in combination. Among these, the silicone resin in powder form is preferred, since it can prevent the silicone resin from being cured by moisture, temperature, etc., and can obtain a resin composition with even better storage stability at room temperature.

[0030] When the silicone resin is in powder form before being dissolved or dispersed in an organic solvent, the average secondary particle size of the silicone resin before being dissolved or dispersed in an organic solvent is not particularly limited, but from the viewpoint of making the solubility or dispersibility of the silicone resin in the organic solvent uniform, it is preferably 1.0 μm or more and 500 μm or less, more preferably 2.0 μm or more and 400 μm or less, and particularly preferably 10 μm or more and 100 μm or less. In addition, the shape of the silicone resin in powder form can be, for example, spherical, amorphous, etc., and spherical is preferred.

[0031] When the silicone resin is an emulsion before being dissolved or dispersed in an organic solvent, the silicone resin before being dissolved or dispersed in an organic solvent is preferably an oil-in-water (O / W) emulsion from the viewpoint of uniforming the solubility or dispersibility of the silicone resin in the organic solvent. When the silicone resin is an oil-in-water (O / W) emulsion, the resin composition of the present invention contains a silicone resin, an organic solvent, and water. When the silicone resin is an oil-in-water (O / W) emulsion, the average primary particle size of the silicone resin is not particularly limited, but is preferably 100 nm or more and 500 nm or less, more preferably 200 nm or more and 400 nm or less, and particularly preferably 250 nm or more and 350 nm or less, from the viewpoint of uniforming the solubility or dispersibility of the silicone resin in the organic solvent. When the silicone resin is an oil-in-water (O / W) emulsion, the solid content is not particularly limited, but may be, for example, 20 mass % or more and 40 mass % or less. Furthermore, when the silicone resin is an oil-in-water (O / W) emulsion, its viscosity is not particularly limited, but may be, for example, from 1 mPa·s to 100 mPa·s.

[0032] In view of the above, the resin composition of the present invention is preferably formed by dissolving or dispersing a silicone-based resin that is a powder having an average secondary particle diameter of 1.0 μm to 500 μm and / or a silicone-based resin that is an oil-in-water (O / W) emulsion in an organic solvent.

[0033] The content of the silicone-based resin in 100% by mass of the resin composition of the present invention is not particularly limited, but the lower limit is preferably 1.0% by mass, more preferably 2.5% by mass, from the viewpoint that the frictional force between the surface of the jig and the workpiece and the frictional force between the surface of the jig and the secondary product are reliably reduced, and a coating having excellent sliding properties can be obtained. The frictional force between the surface of the jig and the workpiece and the frictional force between the surface of the jig and the secondary product are further reduced, and a coating having even more excellent sliding properties can be obtained. On the other hand, the upper limit of the content of the silicone-based resin in 100% by mass of the resin composition of the present invention is preferably 10% by mass, more preferably 8.0 parts by mass, and particularly preferably 6.5% by mass, from the viewpoint that the thickness of the coating formed by applying the resin composition of the present invention to the surface of the jig is uniform, and the frictional force between the surface of the jig and the workpiece and the frictional force between the surface of the jig and the secondary product are reliably reduced.

[0034] Silicone resins with silicone main chains on the market include silicone resins with acrylic graft polymer side chains such as "Charine R-170", "Charine R-170S", "Charine R-175S", "Charine R-170HS", "Charine R-180S", "Charine R-150HGS", "Charine R-570S", "Charine R-744S", and "Charine R-200" (all powders, Nissin Chemical Industry Co., Ltd.). Silicone resins with vinyl acetate graft polymer side chains include "Silicone-vinyl acetate hybrid resin emulsion 1807", "Silicone-vinyl acetate hybrid resin emulsion 1815MP", "Silicone-vinyl acetate hybrid resin emulsion 1817", and "Silicone-vinyl acetate hybrid resin emulsion 1827" (oil-in-water emulsions, Nissin Chemical Industry Co., Ltd.).

[0035] <Organic solvent> The organic solvent is a solvent or dispersion medium for the silicone resin having a silicone main chain. The organic solvent is not particularly limited as long as it functions as a solvent or dispersion medium for the silicone resin, but it is preferable to use a hydrocarbon-based, ester-based, ketone-based, amide-based, etc., because it improves the solubility or dispersibility of the silicone resin in the resin composition and can reliably be a one-liquid type.

[0036] Examples of the hydrocarbon organic solvent include benzene, toluene, xylene, hexane, and heptane. Examples of the ester organic solvent include ethyl acetate, butyl acetate, dimethyl carbonate, and diethyl carbonate. Examples of the ketone organic solvent include acetone, methyl ethyl ketone, diethyl ketone, methyl isobutyl ketone, and cyclohexanone. Examples of the amide organic solvent include N-methylformamide, N,N-dimethylformamide, N,N-diethylformamide, acetamide, N-methylacetamide, and N,N-dimethylacetamide. These organic solvents may be used alone or in combination of two or more.

[0037] Of these organic solvents, it is more preferable to contain a ketone-based solvent, since this further improves the solubility or dispersibility of the silicone-based resin in the resin composition and more reliably makes it a one-component type, and it is particularly preferable to contain methyl ethyl ketone, since this can impart excellent solubility to the silicone-based resin in the resin composition, more reliably makes it a one-component type, and further improves the storage stability of the resin composition at room temperature.

[0038] <Optional ingredients> The resin composition of the present invention may be a composition comprising a silicone-based resin and an organic solvent. In addition to the silicone-based resin and the organic solvent, the resin composition of the present invention may also contain various additives such as a curing agent, a surfactant, a reaction accelerator, etc., as optional components, as necessary.

[0039] Next, a method for producing the resin composition of the present invention will be described. The resin composition of the present invention can be produced by adding a silicone-based resin to an organic solvent in a container while stirring the organic solvent, and then stirring for a predetermined period of time after the silicone-based resin has been added.

[0040] (2) Sliding coating made of a resin composition The slide coating, which is a coating of the resin composition of the present invention, will be described in detail below. The resin composition of the present invention is applied to the surface of a jig, thereby forming a slide coating on the surface of the jig. In addition, a workpiece is attached to the surface of the jig on which the slide coating is formed, so that the slide coating formed by applying the resin composition of the present invention is located between the surface of the jig and the workpiece.

[0041] By applying the resin composition of the present invention to the surface portion of a jig to which the workpiece, which is the primary product, is attached, a sliding coating is formed which has excellent adhesion to the surface portion of the jig and conformability to the surfaces of the workpiece and the jig.

[0042] The material of the surface of the jig is not particularly limited, but examples thereof include a surface of the jig formed of an elastic body. Examples of the elastic body include a rubber member such as urethane rubber, a heat shrink tube, etc. In addition, the shape of the surface of the jig to which the workpiece is attached is not particularly limited, but examples thereof include a cylindrical shape, a flat plate shape, etc.

[0043] The material of the workpiece is not particularly limited, but may be, for example, rubber. The shape of the workpiece is not particularly limited, but may be, for example, a cylindrical shape, a flat plate shape, etc. When the shape of the workpiece is cylindrical, the workpiece is attached to the jig by fitting the workpiece onto the outer circumferential surface of the surface part of the jig, which is cylindrical.

[0044] A secondary product may be obtained by cutting the workpiece attached to the surface of the jig, for example, by cutting with a blade. When a secondary product is obtained by cutting the workpiece, the sliding coating on the surface of the jig formed from the resin composition is required to have adhesion to the surface of the jig in order to prevent peeling from the surface of the jig due to the cutting process. Even if the surface of the jig is formed of an elastic body that is easily deformed, the sliding coating formed by applying the resin composition of the present invention has excellent adhesion to the surface of the jig. Therefore, the sliding coating formed by applying the resin composition of the present invention has excellent durability against all processes, including cutting.

[0045] In addition, when a secondary product is obtained by cutting a workpiece, the surface of the workpiece and the surface of the jig may be elastic, such as when the surface of the jig is an elastic body and the workpiece is rubber. When the surface of the workpiece and the jig are both elastic, the sliding coating on the surface of the jig formed with the resin composition of the present invention is required to have conformability to the surface of the workpiece and the jig in order to improve the cutting accuracy of the workpiece. Even if the surface of the workpiece and the surface of the jig are both formed of an elastic body that is easily deformed, the sliding coating formed by applying the resin composition of the present invention has excellent conformability to the surface of the workpiece and the jig. Therefore, the sliding coating formed by applying the resin composition of the present invention has excellent processing accuracy for all processing including cutting.

[0046] The friction coefficient of the surface of the sliding coating is not particularly limited as long as it has slidability, but in order to improve in a well-balanced manner the attachment property of the workpiece to the surface part having the sliding coating, the fixing stability of the workpiece attached to the surface part having the sliding coating, the detachability when removing the secondary product from the surface part having the sliding coating, and the slidability between the workpiece and the secondary product, the static friction coefficient of the surface of the sliding coating is greater than the kinetic friction coefficient, and the static friction coefficient is preferably 0.05 to 0.15 and the kinetic friction coefficient is preferably 0.03 to 0.13, and the static friction coefficient of the surface of the sliding coating is particularly preferably greater than the kinetic friction coefficient, and the static friction coefficient is 0.07 to 0.12 and the kinetic friction coefficient is preferably 0.04 to 0.11. In this specification, the static friction coefficient and the kinetic friction coefficient are values ​​measured using a ball (pin) on disk type friction and wear tester (based on JIS R 1613-1993).

[0047] Next, a method for forming a sliding coating on the surface of a jig using the resin composition of the present invention will be described. First, the resin composition of the present invention is applied to the surface of the jig in a predetermined thickness. The application method is not particularly limited, and examples thereof include brush application, spray application, and application by immersion. Next, the resin composition applied to the surface of the jig is dried (heated) to volatilize the organic solvent, thereby forming a sliding coating. The drying time is, for example, 1 minute or more and 20 minutes or less, and the drying temperature is, for example, 40° C. or more and 150° C. or less. In addition, the drying process may be performed at room temperature (for example, 25° C.) by adjusting the length of the drying time.

[0048] (3) A jig having a sliding coating of a resin composition The jig having a sliding coating of the resin composition of the present invention will be described in detail below. By applying the resin composition of the present invention to the surface of the jig, it is possible to obtain a jig having a sliding coating formed of the resin composition on the surface on which a workpiece is attached.

[0049] By applying the resin composition of the present invention to the surface of a jig, a jig can be obtained having a sliding coating on the surface to which the workpiece, which is a primary product, is attached, the coating having excellent adhesion to the surface of the jig and conformability to the surfaces of the workpiece and the jig.

[0050] The coefficient of friction of the surface of the slide coating provided on the surface portion of the jig is not particularly limited as long as it has slidability; however, from the viewpoint of achieving a well-balanced improvement in the ease of attaching the workpiece to the surface portion of the jig, the fixing stability of the workpiece attached to the surface portion of the jig, the ease of removing the secondary product from the surface portion of the jig, and the slidability of the surface portion of the jig relative to the workpiece and the secondary product, it is preferable that the static friction coefficient of the surface of the slide coating is greater than the kinetic friction coefficient, the static friction coefficient being 0.05 or more and 0.15 or less, and the kinetic friction coefficient being 0.03 or more and 0.13 or less, and it is particularly preferable that the static friction coefficient of the surface of the slide coating is greater than the kinetic friction coefficient, the static friction coefficient being 0.07 or more and 0.12 or less, and the kinetic friction coefficient being 0.04 or more and 0.11 or less. EXAMPLES

[0051] Next, examples of the present invention will be described, but the present invention is not limited to these examples as long as they do not depart from the spirit of the present invention.

[0052] Example 1 While stirring methyl ethyl ketone (organic solvent), a predetermined amount of silicone-based resin having a silicone main chain and an acrylic graft polymer side chain ("Chaline R-570S", powder with a silicone content of 70% by mass and an average secondary particle size of 30 μm) was added, and after the addition of the silicone-based resin was completed, the mixture was stirred for a predetermined time to prepare the resin composition of Example 1, in which the silicone-based resin content was 1.0% by mass in 100% by mass of the resin composition.

[0053] Example 2 A resin composition of Example 2 was prepared in the same manner as in Example 1, except that the content of the silicone resin in 100% by mass of the resin composition was 2.5% by mass.

[0054] Example 3 A resin composition of Example 3 was prepared in the same manner as in Example 1, except that the content of the silicone resin in 100% by mass of the resin composition was 5.0% by mass.

[0055] Example 4 A resin composition of Example 4 was prepared in the same manner as in Example 1, except that the content of the silicone resin in 100% by mass of the resin composition was 7.0% by mass.

[0056] Example 5 A resin composition of Example 5 was prepared in the same manner as in Example 1, except that the content of the silicone resin in 100% by mass of the resin composition was 10% by mass.

[0057] Example 6 While stirring methyl ethyl ketone (organic solvent), a predetermined amount of silicone resin having a silicone main chain and a vinyl acetate graft polymer side chain ("Silicone-vinyl acetate hybrid resin emulsion 1817", silicone content 30 mass%, oil-in-water emulsion) was added, and after adding the silicone resin was completed, the mixture was stirred for a predetermined time to prepare the resin composition of Example 6, in which the silicone resin content was 2.5 mass% in 100 mass% of the resin composition.

[0058] Example 7 A resin composition of Example 7 was prepared in the same manner as in Example 6, except that the content of the silicone resin in 100% by mass of the resin composition was 5.0% by mass.

[0059] Example 8 The resin composition of Example 8 was prepared in the same manner as in Example 6, except that the content of the silicone resin in 100% by mass of the resin composition was 10% by mass.

[0060] Example 9 While stirring methyl ethyl ketone (organic solvent), a predetermined amount of silicone resin having a silicone main chain and a vinyl acetate graft polymer side chain ("Silicone-vinyl acetate hybrid resin emulsion 1827", silicone content 30 mass%, oil-in-water emulsion) was added, and after adding the silicone resin was completed, the mixture was stirred for a predetermined time to prepare the resin composition of Example 9, in which the silicone resin content was 2.5 mass% in 100 mass% of the resin composition.

[0061] Example 10 A resin composition of Example 10 was prepared in the same manner as in Example 9, except that the content of the silicone resin in 100% by mass of the resin composition was 5.0% by mass.

[0062] Example 11 A resin composition of Example 11 was prepared in the same manner as in Example 9, except that the content of the silicone resin in 100% by mass of the resin composition was 10% by mass.

[0063] Comparative Example 1 A predetermined amount of silicone was added while stirring the organic solvent, and after the addition of the silicone was completed, predetermined amounts of curing agent and reaction accelerator were added and stirred for a predetermined time to prepare the composition of Comparative Example 1, in which the silicone content was 5.0 mass% in 100 mass% of the composition.

[0064] Sample Production Process A flat substrate made of urethane rubber was immersed for 1 minute or 3 minutes in the resin compositions of Examples 1 to 11 and the composition of Comparative Example 1 to coat the surface of the substrate made of urethane rubber with the resin compositions of Examples 1 to 11 and the composition of Comparative Example 1. The coated resin compositions of Examples 1 to 11 and the composition of Comparative Example 1 were then dried at 100° C. for 10 minutes to form a sliding coating on the surface of the substrate made of urethane rubber.

[0065] Evaluation items (1) Sliding properties of the coating For the samples prepared by the above sample preparation process, a friction and wear test was carried out under the following conditions using a ball-on-disk type friction and wear tester (conforming to JIS R 1613-1993) to measure the friction coefficient of the sliding coating formed on the surface of the urethane rubber substrate. The sliding properties were evaluated based on the average and maximum friction coefficients according to the following criteria, with a rating of △ or higher being considered a pass. ◎: For both samples with an immersion time of 1 minute and an immersion time of 3 minutes, the average friction coefficient was 0.115 or less and the maximum friction coefficient was 0.180 or less. Good: For at least one of the samples with an immersion time of 1 minute and an immersion time of 3 minutes, the average friction coefficient was greater than 0.115 and less than 0.125, or the maximum friction coefficient was greater than 0.180 and less than 0.200. △: For at least one of the samples with an immersion time of 1 minute and an immersion time of 3 minutes, the average friction coefficient was greater than 0.125 and less than 0.150, or the maximum friction coefficient was greater than 0.200 and less than 0.250. ×: At least one of the samples with an immersion time of 1 minute and an immersion time of 3 minutes had an average friction coefficient of more than 0.150 or a maximum friction coefficient of more than 0.250. <Friction and wear test conditions> The friction coefficient was measured once per second with a ball radius of 3.0 mm, a rotation speed of 15 rpm, a sample peripheral speed of 4.7 mm / sec, a pressing load of 0.49 N, and a measurement time of 3600 seconds. A graph was obtained with the friction coefficient on the vertical axis and the time (unit: seconds) on the horizontal axis, and the average and maximum values ​​of the friction coefficient were calculated from the graph obtained.

[0066] (2) Adhesion of the coating to the surface of the substrate After the sliding property test, the appearance of the sliding coating on the surface of the substrate was observed, and the adhesion to the surface of the substrate was evaluated according to the following criteria, with a rating of △ or higher being deemed to be a pass. ◯: No change in appearance of the sliding coating was observed before and after the sliding test. △: After the sliding test, slight changes were observed in the appearance of the sliding coating. ×: Peeling was observed in the appearance of the sliding coating after the sliding property test.

[0067] (3) Adherence of the coating to the surface of the substrate For the samples prepared by the above sample preparation process, the appearance of the slide coating was observed when the substrate on which the slide coating was formed was bent and stretched, and the conformability to the surface of the substrate was evaluated according to the following criteria, with a rating of △ or higher being deemed to be a pass. ◯: No change in appearance of the sliding coating is observed when the substrate is bent or stretched. Δ: When the substrate was bent or stretched, slight changes such as cracks were observed in the appearance of the sliding coating. ×: When the substrate was bent or stretched, changes such as cracks were observed in the appearance of the sliding coating.

[0068] (4) Storage stability The resin compositions of Examples 1 to 11 and the composition of Comparative Example 1 were left to stand at room temperature (25°C) for 30 days after preparation, and their appearances were observed to evaluate their storage stability according to the following criteria. A rating of △ or higher was deemed to be acceptable. ○: No change in appearance was observed before and after storage. Δ: A small amount of precipitate was observed after standing. ×: A large amount of precipitates was observed after standing.

[0069] (5) Long-term storage stability Regarding the resin compositions of Examples 1 to 11 and the composition of Comparative Example 1, after leaving them at room temperature (25°C) for 180 days after preparation, the appearance of the containers storing the resin compositions of Examples 1 to 11 and the composition of Comparative Example 1 was observed immediately after shaking them by hand, and the long-term storage stability was evaluated according to the following criteria, with a rating of △ or higher being considered to be passing. ◯: No precipitate was observed after shaking. Δ: A small amount of precipitate was observed even after shaking. ×: A large amount of precipitate was observed even after shaking.

[0070] The evaluation results are shown in Table 1 below.

[0071] [Table 1]

[0072] From Table 1 above, the resin compositions of Examples 1 to 11, which contain a silicone-based resin having a silicone main chain and an organic solvent, were excellent in adhesion to the surface of the substrate and in conformity with the surface of the workpiece and the substrate, and could form a sliding coating that imparts excellent sliding properties to the surface of the substrate. Furthermore, the resin compositions of Examples 1 to 11 were excellent in storage stability at room temperature and long-term storage stability. Furthermore, the resin compositions of Examples 1 to 11 could be stored as one-liquid compositions and could be applied to a substrate.

[0073] Furthermore, from Table 1 above, it can be seen that in Examples 3, 7, and 10, in which the silicone-based resin content in 100 mass% of the resin composition was 5.0 mass%, the sliding properties of the coating were further improved compared to Example 1, in which the silicone-based resin content in 100 mass% of the resin composition was 1.0 mass%, Example 2, Example 6, and Example 9, in which the silicone-based resin content in 100 mass% of the resin composition was 2.5 mass%, Example 4, in which the silicone-based resin content in 100 mass% of the resin composition was 7.0 mass%, and Example 5, Example 8, and Example 11, in which the silicone-based resin content in 100 mass% of the resin composition was 10 mass%.

[0074] Furthermore, as can be seen from Table 1 above, the resin compositions of Examples 1 to 5, which used powdered silicone-based resins, had improved storage stability and long-term storage stability compared to Examples 6 to 11, which used oil-in-water emulsion silicone-based resins.

[0075] On the other hand, as can be seen from Table 1 above, in Comparative Example 1, which does not contain a silicone-based resin having a silicone main chain, it was not possible to form a coating that imparts excellent sliding properties to the surface of the substrate. Furthermore, the composition of Comparative Example 1 did not provide storage stability or long-term storage stability. [Industrial Applicability]

[0076] The resin composition of the present invention is a one-component type, has excellent storage stability at room temperature, and is capable of forming a sliding coating having excellent adhesion and conformability to a substrate. Therefore, the resin composition of the present invention is particularly useful in the field of jigs in which a workpiece such as rubber is attached to an elastic surface portion, which is then processed to prepare a secondary product from the workpiece.

Claims

1. A resin composition for forming a sliding coating on a surface portion of a jig between the jig having a surface portion and a workpiece to be attached to the surface portion of the jig, A resin composition comprising a silicone-based resin having a silicone main chain and an organic solvent.

2. 2. The resin composition according to claim 1, wherein the silicone resin has a side chain of a polymer containing acrylic and / or a polymer containing vinyl acetate.

3. 3. The resin composition according to claim 1, wherein the polymer containing acrylic is a graft polymer of acrylic, and the polymer containing vinyl acetate is a graft polymer of vinyl acetate.

4. The resin composition according to claim 1 or 2, wherein the silicone content of the silicone-based resin is 50% by mass or more and 95% by mass or less.

5. 3. The resin composition according to claim 1, wherein the silicone-based resin is a powder having an average secondary particle diameter of 1.0 μm to 500 μm and / or the silicone-based resin is an oil-in-water (O / W) emulsion, and the resin composition is formed by dissolving or dispersing the silicone-based resin in the organic solvent.

6. 3. The resin composition according to claim 1, wherein the organic solvent is at least one selected from the group consisting of hydrocarbons, esters, ketones and amides.

7. The resin composition according to claim 1 or 2, wherein the organic solvent comprises a ketone.

8. The resin composition according to claim 1 or 2, wherein the organic solvent comprises methyl ethyl ketone.

9. The resin composition according to claim 1 or 2, wherein a content of the silicone-based resin in 100% by mass of the resin composition is 1.0% by mass or more and 10% by mass or less.

10. 3. The resin composition according to claim 1, wherein the content of the silicone resin in 100% by mass of the resin composition is 3.5% by mass or more and 6.5% by mass or less.

11. 3. The resin composition according to claim 1, wherein the surface of the jig is made of an elastic material, and the workpiece is made of rubber.

12. The resin composition according to claim 11, wherein the elastic body is a rubber material.

13. The resin composition according to claim 11, wherein the elastic body is a heat shrink tube.

14. A sliding coating which is a coating of the resin composition according to claim 1 or 2.

15. 15. The slide coating according to claim 14, wherein the static friction coefficient of the surface of the slide coating is greater than its kinetic friction coefficient, the static friction coefficient being 0.05 or more and 0.15 or less, and the kinetic friction coefficient being 0.03 or more and 0.13 or less.

16. A jig having a slide coating formed from the resin composition according to claim 1 or 2 on a surface portion to which a workpiece is attached.

17. 17. The jig according to claim 16, wherein the static friction coefficient of the surface of the slide coating is greater than its kinetic friction coefficient, the static friction coefficient being 0.05 or more and 0.15 or less, and the kinetic friction coefficient being 0.03 or more and 0.13 or less.

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