JP2006307361A - Reinforcing cord and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a reinforcing cord, capable of improving water resistance and oil resistance by preventing water, nor an oil, from penetrating into the reinforcing cord. <P>SOLUTION: This method for producing the reinforcing cord comprises forming a cover layer made of a polymer material on a side surface of a reinforcing fiber bundle by extrusion molding. It is preferable that a thermoplastic elastomer, rubber, or a mixed material thereof is used as the polymer material. Further, it is preferable that a primary coat layer is formed on the reinforcing fiber bundle, by preliminarily impregnating the bundle with a rubber latex, etc., and drying the bundle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reinforcing cord and a manufacturing method thereof, and further relates to a product in which the reinforcing cord is embedded.

  In order to improve the strength and durability of a product such as a toothed rubber belt, it has been widely practiced to embed glass fibers or chemical fibers as reinforcing fibers in a matrix. However, when these products are used for a long period of time, the reinforcing fibers are fatigued due to bending and the strength is lowered. In addition, it is known that when the moisture or oil enters the inside, the coating layer of the latex covering the fiber swells, the fiber bundle is untwisted, and the strength is accelerated. .

  In view of the above, various improvements have been made in the reinforcing fiber so as to improve the bending resistance of the product, or to reduce the change in characteristics due to the ingress of water or oil. For example, in the case of Japanese Patent Laid-Open No. 2003-253568 and Japanese Patent Laid-Open No. 2003-268678, the present applicant impregnates glass fibers with a latex treatment agent having a small change in properties relative to water or oil. Disclosed is a technique for improving the change in characteristics with respect to oil penetration.

In addition, in the Japanese Patent Application Laid-Open No. 11-217739, the present applicant has bundled several glass fibers impregnated with latex, dried and twisted the glass fiber, and if necessary, a water-soluble material further containing latex. A technique for improving both flex resistance and water / oil resistance by forming a coating layer with a treating agent is disclosed.
JP 2003-253568 A JP 2003-268678 A Japanese Patent Laid-Open No. 11-217739

  By the way, recently, further improvement of the durability of the toothed belt has been demanded particularly in the application of automobiles. However, in the above-described technique or the like, fine holes exist in the formed coating layer due to the manufacturing method, and it is difficult to completely prevent water and oil from entering.

  Further, if the rubber belt reinforced by the cord is strongly bent, the twist may be released by the bending stress applied to the cord, and the breaking strength of the belt may be reduced.

  In addition, when a rubber belt reinforced with a cord is used at a high temperature for a long period of time, the coating layer obtained by drying and curing the latex gradually becomes harder and may be weakened to bend.

  The present invention has been made paying attention to the above problems. The purpose of the invention is to provide a method of manufacturing a reinforcing cord capable of improving water resistance and oil resistance by suppressing water and oil from entering the reinforcing cord, and a reinforcing cord obtained thereby. is there. Another object of the present invention is to provide a method for manufacturing a reinforcing cord that can improve the bending resistance without being untwisted even when bent, and a reinforcing cord obtained thereby.

  In order to achieve the above-mentioned object, the present inventor conducted intensive research. As a result, when a coating layer of a polymer material is formed on the side surface of a reinforcing fiber bundle by extrusion molding to form a reinforcing cord, it is used. It has been found that the bending resistance, water resistance and oil resistance of the product can be improved.

That is, the present invention is the invention according to claim 1,
A method for manufacturing a reinforcing cord, comprising forming a coating layer of a polymer material on a side surface of a reinforcing fiber bundle by extrusion molding.

As invention of Claim 2,
In the manufacturing method of the reinforcing cord according to claim 1,
This is a method of manufacturing a reinforcing cord using a thermoplastic elastomer, rubber, or a mixed material thereof as the polymer material.

As invention of Claim 3,
In the manufacturing method of the reinforcing cord according to claim 1 or 2,
As the polymer material, styrene elastomer, polyamide elastomer, urethane elastomer, polybutylene terephthalate elastomer, nitrile rubber, acrylic rubber, hydrogenated nitrile rubber, silicone rubber, fluorine rubber, ethylene propylene rubber, chloroprene rubber, chlorosulfone It is a manufacturing method of the cord for reinforcement using at least one among chlorinated polyethylene and butyl rubber.

As invention of Claim 4,
In the manufacturing method of the reinforcement cord according to any one of claims 1 to 3,
In this method, the reinforcing fiber bundle is twisted in advance, and the covering layer is formed on the side surface of the reinforcing fiber bundle.

As invention of Claim 5,
In the manufacturing method of the reinforcing cord according to any one of claims 1 to 4,
A bundle of reinforcing fibers is preliminarily impregnated with rubber latex, resin, or a mixture thereof and dried to form a base coating layer, which is twisted to form a reinforcing fiber bundle, and the side surface of the fiber bundle A method of manufacturing a reinforcing cord for forming the covering layer.

As invention of Claim 6,
In the manufacturing method of the reinforcing cord according to claim 5,
The rubber latex is vinylpyridine / styrene / butadiene terpolymer latex, butadiene latex, butadiene / styrene copolymer latex, dicarboxylated butadiene / styrene copolymer latex, ethylene propylene latex, chlorosulfonated polyethylene latex, fluorine This is a reinforcing cord manufacturing method including at least one of rubber latex, acrylic rubber latex, and hydrogenated nitrile rubber latex.

As invention of Claim 7,
In the manufacturing method of the reinforcing cord according to any one of claims 1 to 6,
The reinforcing cord is a reinforcing cord manufacturing method in which an overcoat layer is further formed on the coating layer with a treatment agent containing rubber, a crosslinking agent, carbon black, and a solvent.

As invention of Claim 8,
In the manufacturing method of the reinforcing cord according to claim 7,
This is a method for manufacturing a reinforcing cord in which the rubber is a rubber containing chlorosulfonated polyethylene as a main component.

As invention of Claim 9,
A reinforcing cord obtained by the method for manufacturing a reinforcing cord according to any one of claims 1 to 8.

As an invention according to claim 10,
A product using the reinforcing cord according to claim 9 as a reinforcing material.

As invention of Claim 11,
The product of claim 10,
The product is a product using a reinforcing cord, which is a toothed belt, as a reinforcing material.

  Since the reinforcing cord according to the present invention has the above-described configuration, the following effects can be obtained.

  That is, the reinforcing cord according to the present invention coats the reinforcing fiber bundle with the coating layer of the polymer material by extrusion molding. For this reason, a fine hole is not produced in the coating layer, and intrusion of oil or water can be prevented. Therefore, water resistance and oil resistance in a product using this reinforcing cord can be dramatically improved.

  Further, according to the present invention, the reinforcing fiber bundle inside thereof is firmly bound by the coating layer formed by extrusion molding. For this reason, the twist is not unraveled even when the bending is severe. Therefore, the bending resistance in a product using this reinforcing cord can be dramatically improved.

  Thus, the product using the reinforcing cord of the present invention is excellent in durability such as flex resistance, water resistance and oil resistance. Moreover, since the product according to the present invention is excellent in durability, it is suitable for uses such as a toothed belt.

  Further, when the base coating layer is provided in the reinforcing cord according to the present invention, the base coating layer impregnated in the reinforcing fiber does not require oil resistance or water resistance. For this reason, it is possible to use a low-cost latex or resin water solution.

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

(Reinforcing fiber)
The type and shape of the reinforcing fiber in the reinforcing cord of the present invention are not particularly limited as long as it has a function of reinforcing the product.
For example, glass fiber, polyvinyl alcohol fiber typified by vinylon fiber, polyester fiber, nylon, polyamide fiber such as aramid (aromatic polyamide), polyarylate fiber, polyketone fiber, carbon fiber or polyparaphenylenebenzoxazole (PBO) fiber Etc. can be used. Among these, glass fibers excellent in dimensional stability, heat resistance, tensile strength and the like are preferable. If the product according to the invention is a toothed belt, glass fibers are most often used.

  Although the kind of glass in glass fiber is not specifically limited, High strength glass which is excellent in tensile strength is preferable to general alkali-free glass.

  In addition, although the structure of a fiber is not specifically limited, The filament whose average diameter is 5-13 micrometers is preferable as the filament which is the minimum structural unit of glass fiber. The filaments are bundled with 50 to 2,000 sizing agents, and one or a plurality of the filaments are aligned to form glass fibers. A plurality of glass fibers are drawn together to form a reinforcing fiber bundle. A coating layer is formed on the side surface of the reinforcing fiber bundle by extrusion molding. This coating layer may be formed by an extruder. Such a technique is a well-known technique in the production of an insulation-coated electric wire.

  In addition, the above-mentioned glass fiber is first twisted to be a lower twist, and a plurality of the lower twists are arranged, and an upper twist is applied in a direction opposite to the direction of the lower twist, and the fiber is preferably used as a reinforcing fiber bundle. .

  In addition to this, those that do not perform upper twisting, those that have the same direction of lower twisting and upper twisting, or fibers that are made of different materials in the central part and outer layer part of the reinforcing fiber bundle, Various configurations can be used, such as those with different directions. Thus, the twisted cord is suitable for applications such as a toothed belt.

(Coating layer by extrusion molding)
This covering layer is preferably flexible in order to improve the bending resistance. Therefore, a material having flexible elastomeric properties at room temperature is suitable. Specifically, thermoplastic elastomers and rubbers are suitable. Further, it is desirable to use a material that does not dissolve or foam in the temperature range exposed in the step of forming the overcoat layer after forming the coating layer or in the step of embedding in the matrix. Moreover, since the adhesive force with a matrix or an overcoat layer is also calculated | required, the material which is familiar with them is desirable.

  In the coating layer to be extruded, polymer materials include styrene elastomer, polyamide elastomer, urethane elastomer, polybutylene terephthalate elastomer, nitrile rubber, acrylic rubber, hydrogenated nitrile rubber, silicone rubber, fluorine rubber, ethylene A material containing at least one of propylene rubber, chloroprene rubber, chlorosulfonated polyethylene, and butyl rubber is preferable.

  The raw material for the coating layer may contain short glass fibers, carbon black, silica, and various organic fibers for the purpose of variously changing the moldability, molding conditions or properties after molding.

  Thus, the coating layer formed by extrusion molding is denser in terms of material as compared with the coating layer impregnated with latex, which is a conventional technique. For this reason, the reinforcing cord according to the present invention can prevent water, oil, and the like from entering the inside thereof. Moreover, since it is strong in material and is integrally molded, it has a strong force to bind things inside. For this reason, the function to hold | maintain the structure of an internal reinforcement fiber is strong. This function is remarkable in a twisted reinforcing cord.

  As described above, in the reinforcing cord according to the present invention, the coating layer is formed by extrusion molding on the reinforcing fiber bundle.

(Undercoat layer)
Furthermore, it is preferable that the reinforcing fiber bundle has a base coating layer formed in advance.
For example, the base coating layer may be formed by dipping in the above-described glass fiber in a mixed aqueous solution of resorcin-formalin condensate and rubber latex and drying.

When the product is particularly required to have strength and bending resistance, it is preferable to provide a base coating layer. This is because the provisional coating layer is advantageous in that the reinforcing fibers are not in direct contact with each other and are improved in strength and flex resistance.
The undercoating layer may be formed by applying an aqueous treatment agent to the reinforcing fiber and drying and curing it. Hereinafter, the base coating layer will be described in detail.

  The main components contained in the aqueous treatment agent are vinylpyridine / styrene / butadiene terpolymer latex, butadiene latex, butadiene / styrene copolymer latex, dicarboxylated butadiene / styrene copolymer latex, ethylene propylene latex, chlorosulfonated. One or more latexes among polyethylene latex, fluorine rubber latex, acrylic rubber latex, and hydrogenated nitrile rubber latex may be included.

  The aqueous treatment agent may contain a polyurethane resin, an epoxy resin, an acrylic resin, a phenol resin, a melamine resin, an emulsion of a low-molecular polyolefin resin, or a water-dispersed resin.

  The aqueous treatment agent may contain a resorcin-formalin condensate for the purpose of improving the adhesion between the reinforcing fiber and the latex. In the case of the present invention, the structure of the reinforcing fiber is held by the coating layer formed by extrusion. For this reason, it is not essential to include a resorcin-formalin condensate in the latex. Moreover, the burden on the environment can be reduced by not using formalin.

  Furthermore, carbon black may be included in the aqueous treatment agent. By adding carbon black as an inexpensive inorganic filler, the manufacturing cost of the reinforcing cord can be reduced. Furthermore, the adhesiveness between the reinforcing cord and the matrix can be effectively increased.

  In addition, you may contain other components, such as inorganic fillers other than carbon black, a plasticizer, an anti-aging agent, a metal oxide, a crosslinking agent, or a crosslinking aid, suitably in an aqueous processing agent. Examples of the inorganic filler include silica particles.

  Both the resorcin-formalin condensate and carbon black described above may be included in the aqueous treatment agent.

  The aqueous treatment agent is preferably in a form in which the constituent components of the base coating layer are dispersed in an aqueous solvent. If it is an aqueous solvent, it is easy to handle and the concentration control of the constituent components is easy. Furthermore, it is because an environmental load is remarkably reduced compared with an organic solvent.

  The content ratio of the constituent components of the base coating layer in this aqueous treatment agent is a solid content ratio when the mass of the rubber latex is 100, and the resorcin-formalin condensate is preferably in the range of 0-100, and in the range of 5-30. Is more preferable.

  Among these, if the resorcin-formalin condensate is too much, the rubber latex is relatively reduced, so that the hardness of the base coating layer becomes too high, resulting in a decrease in the bending resistance of the product.

  The method for applying the aqueous treatment agent to the reinforcing fibers to form the base coating layer is not particularly limited. Usually, the reinforcing fiber is immersed in a water tank containing an aqueous treatment agent, and after pulling up, the water is removed by a drying furnace. Moreover, although the drying conditions for removing water are not limited, it can show that it exposes for 0.1 to 2 minutes, for example in 80-320 degreeC atmosphere.

There is a preferred range for the adhesion rate of the base coating layer. The adhesion rate R of the coating layer is a mass percentage indicating how much of the coating layer has adhered to the glass fiber mass in the cord after drying, and is given by the following equation.
R (%) = ((C1-C0) / C0) × 100
Glass fiber dry mass before coating: C0, Glass fiber dry mass after coating: C1

The adhesion rate of the base coating layer is preferably 10 to 30% by mass, and more preferably 12 to 25% by mass. When the adhesion rate is less than 10% by mass, it is difficult to cover all side surfaces of the reinforcing fiber bundle with the base coating layer.
On the other hand, if it exceeds 30% by mass, dripping of the aqueous treatment agent tends to be a problem in the formation of the base coating layer. Furthermore, problems such as the base coating layer being too thick and the characteristics being different between the central portion and the peripheral portion of the reinforcing cord are likely to occur.

(Overcoat)
The reinforcing cord thus obtained can be further overcoated with a treatment agent containing rubber, a crosslinking agent, carbon black, a solvent or an adhesive for the purpose of improving the adhesive strength with the matrix. desirable. For this rubber, chlorosulfonated polyethylene is preferably used.

  The means for embedding the reinforcing cord thus obtained in a matrix of a product such as a belt is not particularly limited. In particular, for toothed belt products, means known for the manufacture of toothed belts for automobiles or printers can be used. The product thus obtained has high durability by embedding the reinforcing cord according to the present invention.

  As a belt matrix, polymer materials such as rubber mainly composed of hydrogenated nitrile rubber finely dispersed in hydrogenated nitrile rubber and zinc methacrylate, rubber mainly composed of chloroprene rubber and ethylene propylene rubber, and polyurethane. Is preferably applicable.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.

Example 1
In Example 1, three glass fibers (200 filaments of E glass composition having an average diameter of 9 μm are bundled together) are aligned, and the water-soluble treatment agent shown in Table 1 is applied by a known method, and this is set to 150 ° C. It was dried in a drying oven for 1 minute to form a base coating layer to obtain glass fibers.

(Table 1)
Composition of water-soluble treatment agent ──────────────────────────────
H-NBR (solid content 40%) (* 1) 100 parts by mass RF 10 parts by mass ──────────────────────────────
(* 1) ZETPOL LATEX, manufactured by Nippon Zeon Co., Ltd. RF: Resorcin-formalin condensate

  This glass fiber was subjected to 8 times / 10 cm of lower flame, 11 of the lower twists were aligned, and 8 times / 10 cm of upper twist was applied to obtain a reinforcing fiber bundle. The adhesion rate of the base coating layer was 20% by mass with respect to the mass of the reinforcing fiber bundle.

  Next, a coating layer having a thickness of about 0.1 mm was formed on a side surface of the reinforcing fiber bundle by using an extruder shown in FIG. The temperature during coating molding is 170 ° C. This temperature is higher than the temperature applied during the formation of the overcoat layer or during the molding of the product. This nylon coating layer can firmly hold the reinforcing fiber bundle in the product.

  In FIG. 1, the extrusion molding machine 1 mainly includes an extrusion mechanism part 11 and a crosshead part 15. The extrusion mechanism unit 11 includes a cylinder 12, a screw 13, and a heater (not shown). The polymer material 14 forming the coating layer is supplied from a hopper (not shown) into the cylinder 12, heated and melted by a heater, and sent to the crosshead unit 15 by the rotation of the screw 13. The fed polymer material 14 is pushed out to the side surface of the reinforcing fiber bundle 21 that is moved by the transport mechanism (not shown) in the cross head portion 15, thereby forming the coating layer 22. In this way, the reinforcing cord 2 is manufactured.

  FIG. 2 shows an enlarged cross-sectional view of an example of the crosshead portion 15. In FIG. 2, the crosshead portion 15 is constituted by dies 16 and 17 and a cored bar 18 having a land portion. The molten polymer material 14 is fed into the space between the dies 16 and 17 and the cored bar 18 by the extrusion mechanism. Then, the polymer material 14 is extruded to the side surface of the reinforcing fiber bundle 21 to form the covering layer 22, and the reinforcing cord 2 is completed. In this example, the die is a split type.

  FIG. 3 shows the result of observing the surface of the reinforcing cord 2 on which the coating layer was formed by extrusion molding, with a scanning electron microscope (SEM, manufactured by JEOL Ltd., JSM-T330A). The shooting conditions were a pressurization voltage of 20 kV. As is clear from FIG. 3, the surface of the coating layer formed by extrusion, which is a feature of the present invention, was very smooth, and no fine holes that allowed water or oil to enter were observed.

  Further, an overcoat layer was formed on the reinforcing cord. The overcoat layer was formed by applying and drying a mixture of chlorosulfonated polyethylene, isocyanate, carbon black, P-nitrosobenzene, xylene and toluene. Here, the coating and drying steps may be repeated twice, for example. Thus, the reinforcing cord is obtained by the manufacturing method of the present invention. The overcoat layer is effective for improving the adhesion between the reinforcing cord and the matrix.

  FIG. 4A is a schematic cross-sectional view of the reinforcing cord 2 obtained as described above. In the reinforcing cord 2, first, a base coating layer 23 is formed on a glass fiber 20 in which a plurality of filaments are bundled, and this is twisted to form a reinforcing fiber bundle 21, and a coating layer 22 is formed on this side surface. Further, an overcoat layer 24 is formed thereon to form the reinforcing cord 2. In FIG. 4 (a), hatching was not performed in order to make the outline visible.

  Subsequently, a flat belt was produced using the reinforcing cord of the present invention. In the matrix having the composition shown in Table 2, the reinforcing cord described above was embedded by a known means, and formed into a flat belt having a width of 19 mm and a thickness of 5 mm. The belt part length was 300 mm.

  FIG. 4B is a schematic sectional view of the flat belt 3. The flat belt 3 has a reinforcing cord 2 embedded in a rubber 31 that is a matrix.

(Table 2)
Matrix composition ───────────────────────────────────
H-NBR (* 2) 70 parts by mass H-NBR / ZDMA (* 3) 30 parts by mass ZnO 10 parts by mass Stearic acid 1 part by mass Carbon black 30 parts by mass
Trioctyl Trimellitate 5 parts by mass Sulfur 0.1 parts by mass
1,3-Bis- (t-butylperoxy-isopropyl) -benzene 6 parts by mass──────────────────────────────── ───
(* 2) ZETPOL 2020, manufactured by Nippon Zeon
(* 3) ZSC 2000L, manufactured by Nippon Zeon

The durability of the product thus obtained was evaluated as follows. That is, this flat belt was subjected to a bending test apparatus 5 as shown in FIG. 5, the tensile strength before and after the test was determined, and the strength retention was determined from these strengths. The strength retention was calculated by the following formula, and the durability of the product was evaluated by this index.
Strength retention (%) = (Tensile strength after test / Tensile strength before test) × 100

  In FIG. 5, the bending test apparatus 5 includes a heating bus 50 that creates a test environment. One end of the reinforcing cord 2 is connected to a linear motor 51 and is sequentially hung on pulleys 52 and 52. The flat belt 3 is bent by a roller 53, and the periphery of the roller is stored in a heating bath 50. The other end of the reinforcing cord 2 is sequentially spanned on pulleys 52 and 52 and connected to a weight 54.

  In this way, the test piece was reciprocated by the linear motor 51, and the bending test was repeatedly performed on the flat belt portion 30 along the roller 53. The heating bath 50 has a structure in which water 55 or oil 55 can be put in and tested.

The environmental conditions of the bending test were the following three types of heat test, water injection test, and oil injection test, and the number of flexing tests was 20000.
・ Heat resistance test: Air was put into the heat bath and the ambient temperature was set to 80 ℃ ・ Water injection test: Water was added to the heat bath to normal temperature ・ Oil lubrication test: Oil was added to the heat bath and set to 120 ℃ The above results are shown together in Table 3.

  Next, Table 3 shows the results obtained by immersing the obtained reinforcing cord in 96 ° C. warm water for 24 hours and measuring the water absorption rate. Similarly, Table 3 also shows the results of measuring the oil absorption by immersing in oil at 120 ° C. for 24 hours.

(Table 3)
────────────────────────────────────────
Example 1 Example 2 Comparative Example 1
────────────────────────────────────────
Reinforcing cord Undercoat layer H-NBR + RF None H-NBR + RF
Cover layer Nylon 12 Nylon 12 None --------------------------------------
Heat resistance test of flat belt 98 85 83
Strength retention rate (%) Water injection test 96 65 60
Lubrication test 90 60 46
---------------------------------------
Water immersion test of reinforcing cord 3.9 3.9 12.7
Water absorption / absorption rate (%) Oil immersion test 3.5 3.5 14.5
────────────────────────────────────────
H-NBR + RF: Mixture of water-soluble hydrogenated nitrile rubber (H-NBR) and resorcin-formalin (RF) condensate

(Example 2)
In Example 2, the base coating layer in Example 1 is omitted. Otherwise, a flat belt was produced in the same manner as in Example 1.

(Comparative Example 1)
In Comparative Example 1, the coating layer formed by extrusion molding in Example 1 is omitted. Otherwise, a flat belt was produced in the same manner as in Example 1.

  From the results shown in Table 3, it was found that forming a coating layer by extrusion molding has a great effect in preventing water and oil from entering the cord. It was also found that the strength retention in the belt bending fatigue test can be dramatically increased.

(Examples 3 and 4 and Comparative Example 2)
In Examples 3 and 4, and Comparative Example 2, the overcoat layer was omitted from Examples 1, 2 and Comparative Example 1, respectively, and the rest was manufactured in the same manner as described above. The water absorption rate and oil absorption rate in these were measured, and the results are shown in Table 4.

(Table 4)
────────────────────────────────────────
Example 3 Example 4 Comparative Example 2
────────────────────────────────────────
Reinforcing cord Undercoat layer H-NBR + RF None H-NBR + RF
Cover layer Nylon 12 Nylon 12 None --------------------------------------
Water immersion test of reinforcing cord 5.0 4.8 32.3
Water absorption / absorption rate (%) Oil immersion test 3.1 3.2 29.3
────────────────────────────────────────
H-NBR + RF: Mixture of water-soluble hydrogenated nitrile rubber (H-NBR) and resorcin-formalin (RF) condensate

  From the results shown in Table 3 and Table 4, the coating layer formed by extrusion can prevent water and oil from entering the reinforcing cord regardless of the presence of the overcoat layer, thereby improving the bending resistance. It turns out that there is a big effect.

It is a schematic diagram explaining an example of the extrusion molding machine which can be used for this invention. It is a cross-sectional schematic diagram explaining an example of the crosshead part of the extrusion molding machine which can be used for this invention. It is the photograph which observed the surface of the coating layer of the reinforcement cord by this invention with the scanning electron microscope. It is a cross-sectional schematic diagram of (a) a reinforcing cord and (b) a flat belt according to the present invention. It is a figure explaining a bending test apparatus.

Explanation of symbols

1: Extruder 11: Extrusion mechanism section 12: Cylinder 13: Screw 14: Polymer material 15: Cross head section 16, 17: Die 18: Core metal 2: Reinforcing cord 20: Glass fiber 21: Reinforcing fiber bundle 22: Coating layer 23: Base coating layer 24: Overcoat layer 3: Flat belt 31: Matrix 5: Bending test device 50: Heating bath 51: Linear motor 52: Pulley 53: Roller 54: Weight 55: Water, oil

Claims (11)

  A method of manufacturing a reinforcing cord, comprising forming a coating layer of a polymer material on a side surface of a reinforcing fiber bundle by extrusion molding. In the manufacturing method of the reinforcing cord according to claim 1,
A method of manufacturing a reinforcing cord using a thermoplastic elastomer, rubber, or a mixed material thereof as the polymer material. In the manufacturing method of the reinforcing cord according to claim 1 or 2,
As the polymer material, styrene elastomer, polyamide elastomer, urethane elastomer, polybutylene terephthalate elastomer, nitrile rubber, acrylic rubber, hydrogenated nitrile rubber, silicone rubber, fluorine rubber, ethylene propylene rubber, chloroprene rubber, chlorosulfone A method for manufacturing a reinforcing cord using at least one of chlorinated polyethylene and butyl rubber. In the manufacturing method of the reinforcement cord according to any one of claims 1 to 3,
A method for manufacturing a reinforcing cord, in which the reinforcing fiber bundle is pre-twisted and the covering layer is formed on a side surface thereof. In the manufacturing method of the reinforcing cord according to any one of claims 1 to 4,
A bundle of reinforcing fibers is preliminarily impregnated with rubber latex, resin, or a mixture thereof and dried to form a base coating layer, which is twisted to form a reinforcing fiber bundle, and the side surface of the fiber bundle A method for manufacturing a reinforcing cord, wherein the covering layer is formed on the substrate. In the manufacturing method of the reinforcing cord according to claim 5,
The rubber latex is vinylpyridine / styrene / butadiene terpolymer latex, butadiene latex, butadiene / styrene copolymer latex, dicarboxylated butadiene / styrene copolymer latex, ethylene propylene latex, chlorosulfonated polyethylene latex, fluorine A method of manufacturing a reinforcing cord including at least one of rubber latex, acrylic rubber latex, and hydrogenated nitrile rubber latex. In the manufacturing method of the reinforcing cord according to any one of claims 1 to 6,
The reinforcing cord is a method for manufacturing a reinforcing cord, in which an overcoat layer is further formed on the coating layer with a treatment agent containing rubber, a crosslinking agent, carbon black, and a solvent. In the manufacturing method of the reinforcing cord according to claim 7,
A method for producing a reinforcing cord, wherein the rubber comprises rubber containing chlorosulfonated polyethylene as a main component.   A reinforcing cord obtained by the method for manufacturing a reinforcing cord according to any one of claims 1 to 8.   A product using the reinforcing cord according to claim 9 as a reinforcing material. The product of claim 10,
A product using a reinforcing cord as a reinforcing material, wherein the product is a toothed belt.