WO2002002863A1 - Fiber-treating agent, reinforcing fiber treated therewith, and rubber product reinforced with the fiber - Google Patents

Abstract

A reinforcing fiber which can have sufficient bonding strength with a single-layer coating film; a fiber-treating agent which enhances the adhesion of fibers to a matrix; and a rubber product containing the reinforcing fiber. The fiber-treating agent contains a rubber-modified epoxy resin. The rubber-modified epoxy resin is one obtained by epoxidizing a polymer having rubber elasticity and combines the high elasticity characteristic of rubbers with high bonding strength due to epoxidization. Examples of the polymer having rubber elasticity include a butadiene/styrene copolymer latex and an acrylonitrile/butadiene copolymer latex.

Description

 Description Fiber treatment agent, reinforcing fiber treated therewith, and rubber product reinforced with the fiber

Technical field

 The present invention relates to a reinforcing fiber buried in rubber or resin to improve its strength and dimensional stability. Further, the present invention relates to a fiber treatment agent used for the fiber and a rubber product reinforced with the fiber treatment agent. Background art

 Rubber products or resin products are buried with glass fibers or organic fibers to improve their dimensional stability and strength. Glass fibers are generally poorly compatible with organic rubbers and resins, so their surfaces are coated with isocyanate or halogen-containing polymers. For example, Japanese Patent Publication No. Hei 5-7-1710 discloses a first layer containing a water-soluble condensate of resorcinol formaldehyde (hereinafter referred to as “RFL”) and rubber, a second layer containing a halogen-containing polymer and an isocyanate. A glass fiber for reinforcing a rubber matrix, which is provided with a coating having a three-layer structure of a third layer made of the same rubber as the rubber matrix, is described. Also, Japanese Patent Application Laid-Open No. 1-22213 describes glass fibers provided with a coating containing RFL, butadiene-styrene-butylpyridine-terpolymer, and chlorosulfonated polyethylene.

These coatings exhibit intermediate properties between glass fiber and a rubber matrix or resin matrix (hereinafter simply referred to as a “matrix”), and are compatible with both and play a role in increasing their adhesive strength. Organic fibers, on the other hand, are more familiar with the matrix than glass fibers, but still have insufficient adhesion, and are coated with a glass-like coating to further enhance them. For example, Japanese Unexamined Patent Publication No. 6-259798 discloses a coated aromatic film having a two-layer structure of a first layer containing a polyepoxide compound containing two or more epoxy groups and a second layer containing RFL. A group polyamide reinforcing fiber is described. Also, Japanese Patent Application Laid-Open No. H10-240780 describes a polyester fiber provided with a coating containing polyvinyl formaldehyde, an aromatic epoxide compound, a blocked polysocyanate compound and RFL. I have.

 However, 'the conventional technology has the following problems.

The glass fiber provided with the above-mentioned three layers has a high adhesive strength because its properties gradually change from a glass fiber to a rubber matrix, but the manufacturing process is complicated. On the other hand, glass fibers and organic fibers with a single-layer coating simplify the manufacturing process, but are not sufficiently adhesive to matrix. In addition, since glass fibers and organic fibers are made of different materials, it is difficult to use a common fiber treatment agent, and each requires a special fiber treatment agent.

 The present invention has been made in view of such a problem existing in the prior art. The objective is to provide a reinforcing fiber that can exhibit sufficient adhesive strength with a single-layer coating, a fiber treating agent that increases the adhesive strength between the fiber and the matrix, and a rubber product using the reinforcing fiber. It is in. Disclosure of the invention

In order to achieve the above object, according to a first aspect of the present invention, there is provided a fiber treating agent containing a rubber-modified epoxy resin obtained by epoxidizing acrylonitrile-butadiene copolymer latex. According to a second aspect of the present invention, there is provided a fiber treating agent containing a rubber-modified epoxy resin and a phenol resin.

 Preferably, in the fiber treating agent according to the second aspect, the rubber-modified epoxy resin and the phenol resin have a solid content of 10 to 90% by weight based on the total solid content.

 More preferably, both the rubber-modified epoxy resin and the phenol resin are emulsions.

 Preferably, the rubber-modified epoxy resin in the fiber treating agent according to the second aspect of the invention is a product obtained by epoxidizing butadiene-styrene copolymer latex or acrylonitrile-butadiene copolymer latex.

 Also preferably, in the fiber treatment agent according to the first and second aspects of the invention, the concentration of the total solid content in the fiber treatment agent is 10 to 50% by weight. Further, in order to achieve the above object, according to a third aspect of the present invention, there is provided a reinforcing fiber treated with the fiber treating agent according to the first and second aspects.

 Preferably, the reinforcing fiber of the present invention is obtained by treating a glass fiber or an aramide fiber with a fiber treating agent.

 More preferably, the reinforcing fiber of the present invention is such that the amount of solids of the fiber treating agent attached to the fiber is 10 to 30% by weight based on the weight of the reinforcing fiber.

 Furthermore, to achieve the above object, according to a fourth aspect of the present invention, there is provided a rubber product having the reinforcing fiber of the present invention embedded therein.

Preferably, the rubber product of the present invention has a reinforcing fiber weight ratio of 10 to 70% by weight. More preferably, the rubber product of the present invention comprises a reinforcing fiber having an aramide fiber and a single-layer film formed thereon, and a rubber matrix in which the reinforcing fiber is embedded. Adhesive strength between fiber, film, and rubber matrix is 200 kgf / 25 mm width or more.

BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described in detail.

 According to the present invention, a fiber-modified agent contains a rubber-modified epoxy resin. The rubber-modified epoxy resin is obtained by converting a polymer compound exhibiting rubber elasticity into epoxy, and has both high elasticity characteristic of rubber and high adhesive strength by epoxidation. Examples of the polymer compound exhibiting rubber elasticity include butadiene-styrene copolymer latex, atarilonitrile butadiene copolymer latex, chlorosulfonated polyethylene latex, butadiene rubber latex, and isoprene rubber latex. Is epoxidized to add a hydroxyl group or an epoxy group to its side chain. Hydroxyl groups or epoxy groups (hereinafter simply referred to as “epoxy groups”) are polar groups and have high chemical reactivity, so they act with surrounding substances to reduce the adhesive force between polymer compounds in the coating. And also improves the adhesion between the coating and the fiber or matrix. Therefore, rubber products and resin products (hereinafter simply referred to as “products”) in which reinforcing fibers treated with this fiber treatment agent are embedded have high integrity, high durability, and high strength.

These rubber-modified epoxy resins are used singly or as a mixture of two or more. Depending on the compatibility with the fiber and the matrix, a mixture of two or more is often preferred. This is thought to be due to the fact that the coating is required to have medium properties of fiber and matrix. Two or more species of go By mixing a rubber modified epoxy resin, the characteristics of each rubber can be reflected on the film. For example, when the fiber is a metal fiber, the properties of the metal fiber and the matrix are significantly different. Therefore, it is preferable that the coating contains a component that is well compatible with the metal fiber and the matrix.

 The rubber-modified epoxy resin is obtained by epoxidizing the above-mentioned polymer compound, and among them, those obtained by epoxidizing butadiene-styrene copolymer latex or acrylonitrile-butadiene copolymer latex are preferable. Butadiene-styrene copolymer latex and acrylonitrile-butadiene copolymer latettes are characterized by high flexibility due to non-crystallinity. When this rubber-modified epoxy resin is used as a reinforcing fiber of a product that requires bending resistance, it exerts its function of flexibility sufficiently. For example, if the product is an engine timing belt or belt on a belt conveyor.

 As the rubber-modified epoxy resin of butadiene-styrene copolymer latex, for example, Yukaresin KE172 (trade name: manufactured by Yoshimura Oil Chemical Co., Ltd.) can be mentioned. Examples of the rubber-modified epoxy resin of the acrylonitrile-butadiene copolymer latex include Yucalezin K E173 (trade name, manufactured by Yoshimura Oil Chemical Co., Ltd.). These epoxy resins have been emulsified in advance and are easy to uniformly diffuse in the fiber treatment agent, which is convenient.

 Further, the fiber treating agent may contain other components together with the rubber-modified epoxy resin. Other components are, for example, non-epoxidized rubbers or resins, emulsifiers, surfactants, blocking agents, stabilizers or antiaging agents.

Non-epoxidized rubber includes butadiene-styrene copolymer latex, acrylonitrile-butadiene copolymer latex, and Examples include sulfonated polyethylene latex and carbonyl-modified butadiene styrene copolymerized latex. Examples of the non-epoxidized resin include a phenol resin, an acryl resin, a polyurethane resin, and a polyester resin. By containing these components, the coating can have different properties from the rubber-modified epoxy resin. Among them, the fiber treating agent preferably contains a phenol resin. A phenol resin is a resin obtained by an addition condensation polymerization reaction between phenol and formaldehyde, and can be classified into a resol type and a novolak type depending on the reaction conditions. Either one of these may be used alone, or both may be used in combination. The phenol resin plays a role in increasing the strength of the coating because it easily takes a three-dimensional structure by a polymerization reaction. Further, the phenolic resin is considered to react with the rubber-modified epoxy resin in the polymerization process, so that the integrity of the coating can be improved.

 Examples of these phenolic resins include Yukaresin KE910, Yukaresin KE911, and Yukaresin KE912 (trade name: manufactured by Yoshimura Oil Chemical Co., Ltd.). These phenolic resins are previously emulsified.

 Examples of the emulsifier include polyoxyethylene nonyl ether, polyoxyethylene nonyl phenyl ether, and polymethyl phenyl siloxane. The emulsifier serves to promote the conversion of each component of the fiber treating agent into an emulsion, and effectively acts to uniformly diffuse each component. It also improves the smoothness of the treated fibers.

 The fiber treating agent is generally used in the form of a solution because of its easy handling and application to fibers. On the other hand, during storage and transportation, it is convenient to use only solids without solvent.

The method for producing the fiber treating agent is not particularly limited. Alternatively, each component is charged into an organic solvent and uniformly dispersed with a stirrer. As the organic solvent, alcohol solvents such as methyl alcohol and ethyl alcohol are preferable from the viewpoints of affinity with water and easy removal of the solvent at the time of film formation.

 When the fiber treating agent is composed of a plurality of components, it is preferable to emulsify each component in advance and then mix them. By separately emulsifying, the progress of the polymerization reaction in the fiber treatment agent can be suppressed. As the polymerization reaction proceeds, the viscosity of the fiber treating agent increases, and it becomes difficult to form a uniform film. Therefore, the performance of the reinforcing fiber becomes uneven.

 The fibers used in the present invention are not particularly limited, and examples thereof include glass fibers, polyester fibers, polyamide fibers such as nylon and aramid, and carbon fibers. Among these, when glass fiber or aramide fiber is used, the adhesive force with the rubber matrix is significantly improved. The reason for this is not clear, but it is presumed that the high elasticity of the rubber-modified epoxy resin as a rubber and the improvement of the adhesive force by epoxidation function effectively.

 The type of glass fiber is not particularly limited, and examples thereof include E glass and high-strength glass. Also, the filament diameter of the glass fiber is not particularly limited, and those having a diameter of 5 to 13 m can be suitably used. On the other hand, the aramide fiber is preferably 400 to 5,000 denier because it is easily available.

The glass fibers used in the present invention are obtained by bundling hundreds of glass filaments using a sizing agent. Preferably, the sizing agent contains a silane coupling agent or the like, and the surface thereof is modified so as to increase the affinity between the glass filament and the organic substance. In addition, polyamide fiber In this case, the surface can be treated with epoxy or polyisocyanate to increase the adhesion to the coating.

 The form of these fibers is not particularly limited, and is, for example, staple, filament, cord, rope, or canvas. The form of the reinforcing fibers is determined by the shape and use of the product. The reinforcing fiber of the present invention can exhibit a sufficient adhesive force to Matritus in any form.

 The content of the rubber-modified epoxy resin and the phenol resin in the fiber treating agent is preferably 10 to 90% by weight in terms of solid content based on the total solid content in the fiber treating agent. If the content of the rubber-modified epoxy resin is lower than 10% by weight, the effect of improving the adhesive strength by the epoxy group is unlikely to appear. for,

If it is higher than 90% by weight, it becomes difficult to exhibit the characteristics of other components. A more preferable content of the rubber-modified epoxy resin is 40 to 70% by weight. On the other hand, when the content of the phenol resin is lower than 10% by weight, the effect of improving the strength of the film, which is a characteristic of the resin, becomes difficult to appear. On the other hand, if it is more than 90% by weight, it becomes difficult to exhibit the characteristics of other components. A more preferred content of the phenol resin is 30 to 60% by weight.

 In the case of a two-component fiber treating agent of a rubber-modified epoxy resin and a phenol resin, the content of each component is preferably equal. Substantially, it is preferable that the content of each component is 40 to 60 weight <¾. The reason for this is not clear, but it is thought to be due to the balance between the two effects of improving the adhesion and strength of the coating.

The concentration in the fiber treating agent is suitably from 10 to 50% by weight (¾), and more preferably from 12 to 30% by weight in terms of the total amount of solid contents of all components. When the solid content concentration is lower than 10% by weight, its viscosity is low, so that it is difficult to adhere to the fiber surface in a short time. On the other hand, if it is higher than 50% by weight, the viscosity is high. Therefore, it is difficult to adjust the amount of adhesion to the fiber, and it is difficult to form a uniform coating. The method for applying the fiber treating agent to the fiber surface is not particularly limited, and the conventional technology can be used as it is. Specifically, it is a so-called diving method in which the fiber is continuously passed from one side of the tank filled with the fiber treatment agent to the other side, and the fiber is immersed in this tank at the time of passing. When pulling up the fiber, remove the excess of the fiber treatment agent and heat treat it at 200 to 300 ° C for 0.5 to 3 minutes as necessary. The fiber treating agent attached to the fiber surface forms a film on the fiber surface by scattering of the solvent and polymerization reaction of each component. The weight of the coating, that is, the amount of the fiber treatment agent attached to the fiber surface is preferably 10 to 30% by weight in terms of solids based on the weight of the reinforcing fibers. If the amount of the fiber treating agent is less than 10% by weight, it is difficult to form a uniform film, and the thinness of the film makes it difficult for the rubber-modified epoxy resin to function effectively. On the other hand, when the weight is more than 30 weight << ¾, it takes time to form the film, and it is difficult to form the film uniformly, for example, the fiber treatment agent drips before the film hardens.

 As described above, rubber and resin can be used for the matrix of the present invention, but when rubber is used, the effects of the present invention are most effectively exerted. In other words, rubber products often use the high elasticity characteristic of rubber, so that the reinforcing fibers must necessarily have bending resistance. Therefore, the feature of the flexibility of the rubber-modified epoxy resin of the present invention functions effectively.

The types of rubber matrices that can be used in the present invention are not particularly limited. For example, chloroprene rubber, chlorosulfonated polyethylene rubber, acrylonitrile-butadiene copolymer rubber, partially hydrogenated atalylonitrile-butadiene copolymer Rubber and nitrile group-containing highly saturated copolymer rubber. Vulcanizing agents, vulcanization accelerators, pigments, fats and oils, Stabilizers and the like can be added according to a conventional method according to the purpose.

 The weight ratio of the reinforcing fibers in the rubber product is preferably from 10 to 70% by weight, and more preferably from 15 to 40% by weight. If this weight ratio is lower than 10% by weight, the effect of improving the strength of the rubber product is unlikely to appear. On the other hand, if it is higher than 70% by weight, the properties of the reinforcing fibers are superior to that of rubber matrices, and the elasticity of the rubber product may be suppressed.

 The method of embedding the reinforcing fibers in the rubber matrix is not particularly limited, but for example, the following methods are available. A method in which several reinforcing fibers are aligned, twisted, embedded in an unvulcanized rubber matrix by a known method, and heated and vulcanized at a temperature of 120 to 200 ° C for 1 to 120 minutes. It is.

 Furthermore, a feature of the present invention is that even if the coating is a single layer, it exhibits a sufficient adhesive force to the aramide fiber and the rubber matrix. In the prior art, a method of forming only a single-layer coating on a fiber and embedding it in a matrix was known, but the conventional method did not have sufficient adhesion. For example, when a rubber product manufactured by the conventional method was put on a tensile tester, the rubber product often peeled off from the fiber or matrix from the coating. That is, the adhesive strength of the coating did not reach the strength of the fiber. C This tendency was particularly remarkable in the case of using aramide fiber, and the inherent strength of the aramide fiber was not utilized. Therefore, in the conventional method, the adhesive strength is improved by forming two or three layers of the coating on the aramide fiber. However, when a multilayer coating is formed, the manufacturing process becomes complicated and disadvantageous in terms of manufacturing cost. The reinforcing fiber of the present invention is capable of exhibiting a sufficient adhesive strength between the aramide fiber and the rubber matrix even if the coating is a single layer. However, this does not preclude the formation of more than one layer.

In addition, the adhesive strength in the present invention is as follows: This is the force ("Adhesion 1" in Tables 4 and 5). It is an effect unique to the present invention that the adhesive strength is not less than 200 kgf / 25 mm width when the aramide fiber on which a single-layer film is formed is embedded in a rubber matrix.

 Example '

 Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

 (Manufacture of fiber treatment agent)

 With respect to Examples 1 to 10 and Comparative Examples 1 to 3, fiber treatment agents were individually manufactured according to the conventional methods with the formulations shown in Tables 1 and 2 below. In addition, the solid content concentration of each fiber treating agent was adjusted to be 20 to 25% by weight. Table 1 Ingredients Example 1 2 3 4 5 6 7 Comparative Example 1 2 Yukaresin ΚΕ9Π

New power 'E910

Yukarishin 'KE172

Yukareshin KE173

 R F wave

'' Notoho '-Lurate' Nox

25% ammonia water

water

Yucare Resin K E 912: Phenol resin emulsion (manufactured by Yoshimura Oil Chemical Co., Ltd., solid content 50%)

Yucare Resin KE910: Phenolic resin emulsion (manufactured by Yoshimura Oil Chemical Co., Ltd., solid content 55%) Yucare Resin KE 1 72: Butadiene-styrene copolymer-modified epoxy resin emulsion (manufactured by Yoshimura Oil Chemical Co., Ltd.

55%)

Yucare Resin K E 173: Acryloni trilubutadiene copolymer modified epoxy resin emulsion (Yoshimura Oil Chemical Co., solid content 60%)

Zetpol latex: nitrile group-containing highly saturated copolymer rubber latex (manufactured by Zeon Corporation, solid content 40%)

R F liquid: adjusted according to the formulation shown in Table 3 Table 2

Ingredients' Example 8 Actual; ^ Example 9 Example 10 Comparative Example 3 First Eyebrow (Example 2) (Example 4) (Example 7) (Comparative Example 1) Second Layer

 CSM latex 35 35 35 35 Xylene 65 65 65 65

CS latex: Chlorosulfonated polyethylene rubber latex (manufactured by Koutichi, 30% solids)

(Manufacture of reinforcing fibers)

ALAMID fiber (Tecjin: Technora T2021500D) Then, the fibers were twisted 3.1 times per inch, and the fiber treating agents of Examples 1 to 7 and Comparative Examples 1 and 2 shown in Table 1 above were applied so that the solid content adhered to the fiber surface was 10 to 10 times. Each was applied so as to be 15% by weight, and heat-treated at 250 ° C. for 90 seconds to produce a reinforcing fiber. Further, the fiber treatment agent of the “second layer” in the above “Table 2” was applied to the reinforcing fibers of Examples 2, 4, 7 and Comparative Example 1, and heat-treated at 120 ° C. for 120 seconds. A two-layered reinforcing fiber was produced. The solid content of the second layer was 5 to 10% by weight in the reinforcing fibers. [Manufacture of rubber matrix]

According to a conventional method, in the stage of _c compounded to produce a rubber matrix with the following formulation "Table 3", a fluid viscosity of about 1 0 cps.

 Table 3 Ingredients Hydrogenated nitrile rubber 0 0

 5 Stearic acid 1 Bonbon black 5 0 Trioctyl trimellitate 1 0

 5 Tetramethylthiuram disulfide 1 5

[Production]

The rubber matrix shown in Table 3 above was formed into a sheet having a thickness of 3 mm and a width of 25 mm. Examples 1 to 10 and Comparative Examples 1 to 3 The reinforcing fibers were laid out at regular intervals by a predetermined number, and then the rubber sheet was placed in a mold and heated under pressure for a certain period of time, so that the reinforcing fibers were embedded in the rubber matrix.

 〔Evaluation method〕

 (Adhesive strength: Adhesive 1, 2)

The two reinforcing fibers of Examples 1 to 10 and Comparative Examples 1 to 3 were arranged at equal intervals on the rubber matrix sheet, with a pressing pressure of 80 kgf / cm ² and a mold temperature of 150. Vulcanization was performed at 20 ° C. and a vulcanization time of 20 minutes, and rubber products for testing having a length of 15 cm and a width of 25 mm were produced for each Example and Comparative Example. This rubber product is bowed at a test speed of 50 mm / min with a bow I at the test speed of 50 mm / min using an autograph tensile tester (AGS-500 type OA manufactured by Shimadzu Corporation), and the strength when the rubber product is ruptured, that is, initial bonding The force was measured. The results are shown in Tables 4 and 5 below as "Adhesiveness 1". Observation of the ruptured portions of the rubber products of Examples 1 to 10 confirmed that the amide fibers were ruptured in all cases, and no peeling from the coating occurred.

 Further, after the rubber product was boiled in hot water for 1 hour, the same tensile test as above was performed. The results are shown in Tables 4 and 5 as "Adhesion 2". By measuring the adhesiveness 2, the water resistance of rubber products, that is, the durability in practical use can be determined.

Table Item Example 1 2 3 4 5 6 7 Comparative example 1 2 Adhesion 1 212 210 254 252 206 231 227 140 166 Adhesion 2 138 147 176 143 153 147 157 157 107 117 Unit: kgf / 25 width Table 5 Item Example 8 9 10 Comparative Example 3 Adhesion 1 237 252 239 154 Adhesion 2 167 196 176 127 Unit: kgf / 25rara width From the above Examples and Comparative Examples, the following can be found.

 By comparing Examples 1 to 10 and Comparative Examples 1 to 3, it can be seen that when the fiber-treating agent contains a rubber-modified epoxy resin, the adhesiveness of the rubber product is improved by one or two times. That is, it can be seen that the rubber-modified epoxy resin improves the strength and durability of the rubber product.

 By comparing Examples 1 to 7 and Comparative Examples 1 to 3, it can be seen that when the coating contains a rubber-modified epoxy resin, the initial adhesive strength is improved by 30% or more. Furthermore, since the initial adhesive strength of Comparative Example 3 is about 150 kgf / 25 mm width despite having a two-layer structure, it is clear that the effect when the rubber-modified epoxy resin is contained is large.

In the initial adhesive strength test of Examples 1 to 10 above, no delamination from the coating was observed on the ruptured surface of the rubber product, so that the fiber treatment agent containing the rubber-modified epoxy resin was the same as the aramide fiber and the rubber matrix. shows a sufficient adhesion, that ^mosquitoes? know can sufficiently be exhibited the Arami de fiber original strength.

By comparing Examples 1 to 10, it can be seen that the closer the mixing ratio of the rubber-modified epoxy resin and the phenol resin is, the higher the initial adhesive strength is.o Industrial applicability

 Since the present invention is configured as described above, it has the following effects.

 According to the fiber treating agent of the invention according to the first aspect, since the rubber-modified epoxy resin is contained, the adhesive strength between the polymer compounds in the coating is increased, and the adhesive strength between the coating and the fibers and matritus is further improved. Can also be improved.

 According to the fiber treating agent of the invention according to the second aspect, since the rubber-modified epoxy resin and the phenol resin are contained, the characteristics of each of these resins can be reflected on the film. In addition, by including a phenol resin, the strength and integrity of the coating can be improved.

 In the fiber treating agent of the invention according to the second aspect, the solid content of the rubber-modified epoxy resin and the phenol resin is 10 to 90% by weight with respect to the total solid content, respectively. The characteristics of the component can be effectively exerted.

 Further, in the fiber treating agent of the invention according to the second aspect, since both the rubber-modified epoxy resin and the phenol resin are emulsions, it is possible to suppress the progress of the polymerization reaction in the fiber treating agent. it can.

 In the fiber treating agent according to the first and second aspects, the rubber-modified epoxy resin is obtained by epoxidizing butadiene-styrene copolymer latex or acrylonitrile-butadiene copolymer latex. A film having high flexibility can be formed.

 Furthermore, in the fiber treatment agent according to the first and second aspects of the invention, the concentration of the total solid content in the fiber treatment agent is 10 to 50% by weight. The coating can be formed uniformly.

According to the reinforcing fiber of the third aspect of the present invention, the first and second reinforcing fibers are used. Since the fiber is treated with the fiber treating agent of Aspect, reinforcing fibers that effectively improve the strength of the rubber product can be easily obtained.

 According to the reinforcing fiber of the present invention, since the fiber is a glass fiber or an aramid fiber, the adhesive force between the fiber and the coating can be more effectively improved.

 Furthermore, since the amount of the solid content of the fiber treating agent attached to the fibers is 10 to 30% by weight based on the weight of the reinforcing fibers, the effect of improving the adhesive force by the coating film can be effectively exhibited without waste. it can.

 According to the rubber product according to the fourth aspect of the present invention, since the reinforcing fiber of the present invention is embedded, a rubber product having high integrity and high strength can be easily obtained. it can.

 According to the rubber product of the present invention, since the weight ratio of the reinforcing fibers is 10 to 70% by weight, the elasticity of the rubber matrix and the strength of the reinforcing fibers can be exhibited in a well-balanced manner.

 Still further, according to the rubber product of the present invention, the rubber product comprises a reinforcing fiber having an aramide fiber and a single-layer film formed thereon, and a rubber matrix in which the reinforcing fiber is embedded. Since the adhesive strength between the fiber, the coating, and the rubber matrix is 200 kgf / 25 mm width or more, a rubber product having extremely high adhesive strength can be easily obtained.

Claims

The scope of the claims 1. A fiber treatment agent containing a rubber-modified epoxy resin obtained by epoxidizing acrylonitrile-butadiene copolymer latex.  2. A fiber treatment agent containing rubber-modified epoxy resin and funinol resin. 3. The fiber treating agent according to claim 2, wherein the solid content of the rubber-modified epoxy resin and the phenol resin is 10 to 90% by weight based on the total solid content.  4. The fiber treating agent according to claim 2 or 3, wherein the rubber-modified epoxy resin and the phenol resin are emulsions.  5. The fiber treating agent according to any one of claims 1 to 3, wherein the rubber-modified epoxy resin is obtained by epoxidizing a butadiene-styrene copolymer latex.  6. The fiber treating agent according to claim 4, wherein the rubber-modified epoxy resin is obtained by epoxidizing butadiene-styrene copolymer latex.  7. The fiber treating agent according to claim 2 or 3, wherein the rubber-modified epoxy resin is obtained by epoxidizing acrylonitrile butadiene copolymer latex.  8. The fiber treating agent according to claim 4, wherein the rubber-modified epoxy resin is obtained by epoxidizing acrylonitrile-butadiene copolymer latex.  9. The fiber treating agent according to any one of claims 1 to 3, wherein the total solid content in the fiber treating agent is 10 to 50% by weight.  10. The fiber treating agent according to claim 4, wherein the total solid content in the fiber treating agent is 10 to 50% by weight. 11. The fiber treating agent according to claim 5, wherein the total solid content in the fiber treating agent is 10 to 50% by weight. 12. The fiber treating agent according to claim 6, wherein the total solid content in the fiber treating agent is 10 to 50% by weight <¾.  13. The fiber treating agent according to claim 7, wherein the total solid content in the fiber treating agent is 10 to 50% by weight.  14. Reinforcing fibers treated with the fiber treating agent according to any one of claims 1 to 3.  15. The reinforcing fiber of claim 14, wherein the glass fiber has been treated with the fiber treatment agent.  16. The reinforcing fiber of claim 14, wherein the aramide fiber has been treated with the fiber treatment agent.  17. The reinforcing fiber according to claim 14, wherein the solid content of the fiber treating agent on the fiber is 10 to 30% by weight based on the weight of the reinforcing fiber.  18. A rubber product in which the reinforcing fibers of claim 14 are embedded.  19. A rubber product in which the reinforcing fiber according to any one of claims 15 to 17 is embedded.  20. The rubber product according to claim 18, wherein the weight ratio of the reinforcing fiber is 10 to 70% by weight.  21. The rubber product according to claim 19, wherein the weight ratio of the reinforcing fiber is 10 to 70% by weight.  22. A reinforcing fiber having an aramide fiber and a single layer film formed thereon, and a rubber matrix in which the reinforcing fiber is embedded, wherein the aramide fiber, the film, and the rubber are provided. Rubber products with an adhesive strength between the matrices of at least 200 kgf / 25 mm width.