JP6623831B2 - Organic fiber cord and rubber products - Google Patents

Description

  The present invention relates to an organic fiber cord used for a tire, a hose, a belt, and the like. More specifically, it has a high modulus of elasticity, and significantly improves the heat-resistant adhesiveness, heat-resistant strength retention, and fatigue resistance when exposed to high temperatures for a long time in rubber during the rubber vulcanization process and product use. And a method for producing an organic fiber cord suitable for tires, hoses and belts.

  BACKGROUND ART Fibers such as polyester and aramid have excellent strength, elastic modulus and thermal dimensional stability, and thus have been widely used as reinforcing materials for rubber products such as tires, hoses and belts. However, when used as a reinforcing material embedded in a rubber product, a load is repeatedly applied, and deterioration due to repeated stretching, compression, and bending occurs. In addition, the initial characteristics of strength and adhesiveness are remarkably deteriorated due to such deterioration, so that there is a problem in that it cannot be used.

  The following proposals have been made as a method for solving these problems.

  Patent Literature 1 discloses a cord in which the impregnation degree of the RFL adhesive is 3.5 to 9%.

  Patent Literature 2 discloses a tire cord manufacturing method including a step of continuously pressing the twisted cord against a felt body impregnated with an adhesive composition.

  Patent Literature 3 discloses a rubber in which a silicate compound in which silicon and magnesium are main constituent elements and the ratio of silicon / magnesium is 1 / (0.1 to 1.0) is blended in an adhesive matrix component. -An adhesive composition for fibers is disclosed.

  Patent Literature 4 discloses that a coating agent is coated with a first treating agent containing three kinds of an aliphatic polyepoxide compound, a blocked polyisocyanate compound, and a vinylpyridine / styrene / butadiene rubber latex having a glass transition point of -30 to 0 ° C. A rubber fiber-reinforced polyester fiber cord coated with a second treating agent containing resorcinol-formalin rubber latex (RFL) as its outer layer, and having a first bath hot stretch tension of 0.05 to 0.40 cN / A method for producing a polyester fiber cord for rubber reinforcement characterized by being treated with dTex is disclosed.

JP 2014-530302 A JP 2009-138292 A Japanese Patent Application Laid-Open No. Hei 9-100165 JP 2013-76186 A

  However, according to Patent Document 1, although the fatigue resistance is improved, the adhesive strength is not sufficient. According to Patent Document 2, the adhesiveness is sufficient, but the fatigue resistance is not improved. According to Patent Document 3, the fatigue resistance is improved and the adhesiveness is sufficient, but the adhesive strength after forced deterioration is not sufficient. According to Patent Literature 4, the adhesive strength and the adhesive strength after forced deterioration are sufficient, and the fatigue resistance is improved, but the durability under an increasingly higher required level has not been sufficient yet.

  Therefore, an object of the present invention is to provide an organic fiber cord which has not been achieved by the above-described conventional technology, has improved fatigue resistance, and has practically sufficient adhesion between fibers and rubber.

  The present inventors have conducted intensive studies and have found that the reason why the fatigue resistance is not improved is that too much impregnation of the cord with the adhesive is performed. Past studies have focused on impregnating the interior of the fiber with an adhesive to ensure adhesion. When the inside of the fiber is filled with the adhesive, the adhesive hardens the cord, restricts the movement of the filament, and deteriorates the fatigue resistance by promoting the chemical decomposition of the fiber. On the other hand, if the impregnating property of the adhesive inside the fiber is insufficient, the adhesive strength is reduced.

  That is, the present invention has the following configurations.

(1) An adhesive having a ply twist and a ply twist, a ply twist coefficient of 1000 to 2500, a ply twist of 1500 to 3600, and a twisted cord containing resorcinol-formalin rubber latex (RFL). A coated organic fiber cord, wherein a primer treatment agent adheres between an adhesive containing resorcinol, formalin and rubber latex (RFL) and a twisted cord, and the primer treatment agent comprises smectite, An organic fiber cord having a compression ratio of 83 to 97% and a degree of RFL impregnation inside the cord of 10 to 50%.

  (2) The organic fiber cord according to the above (1), wherein the organic fiber contains at least one selected from polyethylene terephthalate, nylon 66, and aramid.

  (3) The organic fiber cord according to the above (1) or (2), which is used for reinforcing rubber.

  (4) A rubber product containing the organic fiber cord according to any one of (1) to (3).

  According to the present invention, a fiber cord having significantly improved fatigue resistance when used in a rubber product and having practically sufficient adhesiveness can be obtained. The rubber products reinforced with the fiber cord according to the present invention can withstand long-term severe use when used as tires, belts and hoses.

  Hereinafter, the present invention will be described in detail.

  The organic fiber cord (hereinafter, may be referred to as a cord) of the present invention is a cord made of organic fibers. The organic fiber cord of the present invention is used for various rubber members such as automobiles, such as tires, belts, hoses, etc., and can reduce the weight and durability of the rubber members.

 The organic fiber used for the organic fiber cord is preferably in the form of a multifilament. The material constituting the organic fiber includes at least one selected from polyethylene terephthalate, polyethylene naphthalate, nylon 6, nylon 66, nylon 46, polyvinyl alcohol, rayon, and aramid. It is preferable in terms of productivity.

  Further, the organic fiber used in the present invention may be a fiber to which a polyepoxide compound has been added in advance in the spinning process. Examples of the polyepoxide compound that can be used in the present invention include compounds containing at least two or more epoxy groups per molecule in an amount of 0.1 g equivalent or more per 100 g of the compound. Specifically, unsaturated products such as reaction products of polyhydric alcohols such as pentaerythritol, ethylene glycol, polyethylene glycol, propylene glycol, glycerol and sorbitol with halogen-containing epoxides such as epichlorohydrin, and peroxides or hydrogen peroxide A polyepoxide compound obtained by oxidizing the compound, for example, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexenecarboxylate, bis (3,4-epoxy-6-methyl-cyclohexylmethyl) adipate, phenol novolak type, Hydroquinone type, biphenyl type, bisphenol S type, brominated novolak type, xylene-modified novolak type, phenolglyoxal type, trisoxyphenylmethane type, trisphenol PA type, bisphenol Aromatic polyepoxides such as enol-type polyepoxides and the like can be mentioned. Particularly preferred are sorbitol glycidyl ether type and cresol novolak type polyepoxides.

  These compounds are usually used as an emulsion or a solution. That is, the above compound is dissolved in a solvent and used as a solution or emulsified using a usual emulsifier, for example, sodium alkylbenzenesulfonate, sodium salt of dioctylsulfosuccinate, nonylphenol ethylene oxide adduct, and the like, and used as an emulsified liquid.

  The polyepoxide compound is applied together with a spinning oil in the process of producing organic fibers. At this time, the amount of the polyepoxide compound attached is preferably in the range of 0.1 to 5% by weight. When the amount of the polyepoxide compound adhered is within the above range, the effect of the polyepoxide compound is sufficiently exhibited, and satisfactory adhesion between the organic fiber and the rubber can be obtained. Further, in the above range, the fiber does not become too hard, and the strength is not easily reduced when twisting in the next step and thereafter.

  The organic fiber used in the present invention is not limited by the fineness, the number of filaments, the cross-sectional shape, etc., and usually, a circular cross-section yarn of 200 to 5000 dtex and 30 to 1000 filaments is used, and a fiber of 250 to 3000 dtex and 50 to 500 filaments is used. Circular cross-section yarns are preferred.

  The organic fiber cord of the present invention is usually obtained by twisting the above-mentioned organic fiber to form a raw cord (twisted cord), weaving the raw cord as it is, or weaving it into a raw silk, and then treating with an adhesive. Raw cords used for ordinary carcass tire cords are twisted in the S or Z direction, and then two or three untwisted cords are combined, and the same number of twists are applied in the opposite direction to the twisting. It is what it was. Next, the raw cord is used as a warp, and a cotton yarn is covered with a weft or a cotton yarn is covered with an organic fiber to form a weft, which is woven into a raw cloth. Next, the raw mat is treated with an adhesive to obtain a dip mat.

  On the other hand, for cords for hoses and belts, twist twist, apply two or three strands together and apply the same number of twists in the opposite direction to the twist to form a twisted cord. And make it a dip code.

  The organic fiber cord provided with the adhesive of the present invention refers to both the above-mentioned dip counter and dip cord.

  It is necessary that the organic fiber cord used in the present invention is a twisted cord that has been twisted and twisted. At this time, the twist coefficient K1 of the lower twist needs to be 1000 ≦ K1 ≦ 2500, and preferably 1300 ≦ K1 ≦ 2000. When the twist coefficient of the ply twist is out of the range of 1000 ≦ K1 ≦ 2500, the impregnation degree of RFL is out of the preferable range, or the fatigue resistance in rubber is deteriorated.

  The twist coefficient K2 of the first twist needs to be 1500 ≦ K2 ≦ 3600, and preferably 2000 ≦ K2 ≦ 3000. When the twist coefficient of the ply twist is out of the range of 1500 ≦ K2 ≦ 3600, the impregnation degree of RFL is out of the preferable range, or the fatigue resistance in rubber is deteriorated.

The twist coefficient K is represented by the following equation.
K = T × D ^1/2
(K: twist coefficient, T: number of twists per unit length (twice / 10 cm), D: fineness dTex)

  The cord according to the present invention is a fiber cord in which the above-mentioned twisted cord is coated with an adhesive containing resorcinol-formalin rubber latex (RFL), and has a cord compression ratio of 83 to 97%, and is inserted into the cord. Has an RFL impregnation degree of 10 to 50%.

  In the present invention, before the twisted cord is coated with an adhesive containing resorcinol, formalin, rubber latex (RFL) (sometimes referred to as an RFL adhesive), the twisted cord may be subjected to a primer treatment.

  The preferred range of the code compression ratio is 85 to 95%, and if it is out of this range, the fatigue resistance of the cord deteriorates. The preferable range of the RFL impregnation degree is 10 to 30%. When the impregnation degree is less than 10%, the adhesive strength is reduced, and when the impregnation degree is more than 50%, the fatigue property of the cord is deteriorated. The method of setting the cord compression ratio to 83 to 97% and the degree of impregnation to 10 to 50% is not particularly limited, but an adhesive containing RFL and / or a viscous mineral such as smectite is used as a primer treatment agent before RFL treatment. 1 to 7 parts by weight per 100 parts by weight of the solid content of the adhesive containing RFL, or 1 to 100 parts by weight of the solid content of the primer treatment agent when added to the primer treatment agent before the RFL treatment. It can be achieved by adding 10 to 10 parts by weight and setting the tension in the tank (tension during immersion), the roll pressure, and the tension during drying (DRY tension) described later in a specific range. The viscosity mineral such as smectite is not particularly limited, but smectite which is a water dispersion having a thixotropy index of 2 to 10 when 1 part by weight of a solid content is dispersed in water is preferable.

  When performing the primer treatment, it is preferable to add a blocked isocyanate compound, an epoxy compound, or the like as a primer treatment agent from the viewpoint of adhesiveness.

  It is preferable to add a rubber latex to the above-mentioned primer treating agent from the viewpoint of improving adhesiveness. Examples of the rubber latex include natural rubber latex, butadiene rubber latex, styrene / butadiene rubber latex, vinyl pyridine / styrene / butadiene rubber latex having any other glass transition temperature, nitrile rubber latex, hydrogenated nitrile rubber latex, and chloroprene. Rubber latex such as rubber latex, chlorosulfonated rubber latex, and ethylene / propylene / diene rubber latex can be used in combination.

  The solid content concentration of the primer treatment agent is preferably 1 to 20% by weight.

  The amount of the primer treatment agent attached is preferably in the range of 0.5 to 5% by weight based on the cord from the viewpoint of adhesiveness and fatigue resistance.

  As the RFL adhesive, a practically used rubber adhesive property can be obtained by using a commonly used RFL treating agent obtained by adding a rubber latex (L) to a resorcinol-formalin precondensate (RF).

  The RFL adhesive contains resorcinol-formalin rubber latex (RFL). Resorcinol-formalin rubber latex is a mixture of resorcinol-formaldehyde precondensate and rubber latex. The resorcinol-formalin rubber latex (RFL) is preferably prepared using a resorcinol-formaldehyde precondensate obtained by precondensation under an alkali catalyst. For example, in an alkaline aqueous solution containing an alkaline compound such as sodium hydroxide, resorcinol and formaldehyde are added and mixed, and allowed to stand at room temperature for several hours.After the initial condensation of resorcinol and formaldehyde, a rubber latex is added and the mixed emulsion is added. Is prepared by the following method.

  The resorcinol-formaldehyde precondensate used has a molar ratio of resorcinol to formaldehyde of 1: 0.3 to 1: 5, preferably 1: 0.75 to 1: 2.0. If the molar ratio of formaldehyde is less than the above range, the treated cord may be tacky and cause contamination of the processing machine.On the other hand, if the molar ratio of formaldehyde is greater than this range, the adhesive strength may be reduced. There is.

  Examples of the rubber latex used for the preparation of resorcinol / formalin rubber latex include natural rubber latex, butadiene rubber latex, styrene / butadiene rubber latex, vinylpyridine / styrene / butadiene rubber latex, nitrile rubber latex, hydrogenated nitrile rubber latex, Examples thereof include chloroprene rubber latex, chlorosulfonated rubber latex, and ethylene / propylene / diene rubber latex. These can be used alone or in combination.

  The resorcinol-formalin rubber latex preferably has a compounding ratio of the resorcinol-formaldehyde precondensate to the rubber latex of 2/1 to 1/12 in terms of solid weight. Outside this range, the adhesive strength may be reduced.

  The solid concentration of the RFL adhesive is preferably 3 to 30% by weight.

  The amount of the RFL adhesive to be applied is preferably in the range of 0.5 to 10% by weight based on the cord from the viewpoint of adhesiveness and fatigue resistance. If it exceeds 10% by weight, the degree of impregnation may exceed 50% by weight.

  The organic fiber cord of the present invention, characterized by the above, has remarkably improved fatigue resistance during the rubber vulcanization step and during use of the rubber product. The rubber product reinforced with the organic fiber cord according to the present invention can withstand long-term severe use when used as a tire, a belt or a hose, and is extremely useful for rubber reinforcement.

  Next, a method for producing the organic fiber cord of the present invention will be described. The organic fiber cord of the present invention can be obtained by applying an adhesive containing the aforementioned resorcinol / formalin / rubber latex to the above-mentioned twisted cord. Before applying the RFL adhesive, the above-described primer treatment agent may be applied as necessary.

  The organic fibers used in the present invention are twisted into a raw cord (twisted cord) having the above-mentioned twist coefficient, and then similarly made into a cord screen using a weaving loom. In the case of a hose or a belt cord, it may be subjected to the next dipping step without weaving as it is with a twisted cord or various yarn cords.

  The method of applying the primer treatment agent is performed by dipping the organic fiber raw cord or raw cord, followed by drying and heat treatment. The total solid content concentration of the dip solution of the primer treatment agent may be 2 to 30% by weight, preferably 3 to 15% by weight. If the solid content is too low, the surface tension of the adhesive increases, the uniform adhesion to the organic fiber surface decreases, and the impregnation degree of the RFL adhesive may increase due to the decrease in the amount of resin adhered. On the other hand, if the solid content is too high, the amount of the resin adhered becomes too large, so that the amount of the RFL adhesive attached becomes small and the adhesive strength may decrease.

  When the primer treatment agent is applied, the organic fiber cord is dried at 70 to 150 ° C. for 0.5 to 5 minutes (hereinafter referred to as a dry treatment), and then heat-treated at 180 to 255 ° C. for 0.5 to 5 minutes (hereinafter hot). (Referred to as treatment) to form a film with a primer treatment agent on the fiber surface, but in some cases, drying can be omitted.

  If the temperature of the heat treatment is lower than 180 ° C., the adhesive is not sufficiently dried, and a solid content of the roll in the processing step is gummed up, and the operation stability may be deteriorated. High temperatures are not preferred because the coating formed by the treatment agent formed on the fibers may deteriorate and the impregnation degree of the RFL may increase, or the organic fibers may deteriorate due to heat and the strength may decrease.

  In order to control the resin adhesion amount of the primer treatment agent to the organic fiber, for example, methods such as squeezing with a pressing roller, scraping off with a screver, blowing off with compressed air, and suction can be used. In order to adjust the degree of impregnation, it is preferable to use a pressure roller. When using a pressing roller, the roller pressure is preferably set to 0.1 to 1.0 kPa / dTex. Further, in order to increase the resin adhesion amount, the resin may be adhered a plurality of times. The cord tension at the time of attaching the resin is preferably about 0.05 to 0.5 cN / dTex. In addition, the cord tension during the dry processing (or the hot processing when drying is omitted) is preferably 0.1 to 2.0 cN / dTex. When it is within this range, the code compression ratio and the degree of impregnation can be easily controlled to the preferred ranges, and excellent strength can be obtained.

  When the primer treatment agent is applied as described above, an RFL adhesive containing resorcinol / formalin / rubber latex is subsequently adhered. When the primer treatment agent is not used, the RFL adhesive is directly adhered to the ply twisted cord after the first twist and the first twist.

  The RFL adhesive containing resorcinol-formalin latex preferably has a solid content concentration of 3 to 30% by weight, more preferably 5 to 25% by weight. If the amount is less than 3% by weight, the amount of resin adhering to the dipping liquid in the second bath may be insufficient, and the adhesive strength may not be sufficient. If the solid concentration exceeds 30% by weight, the storage stability of the dip solution is deteriorated, the solid content is agglomerated, the concentration changes, and it becomes difficult to uniformly attach the dip solution to the surface of the organic fiber cord. And the degree of impregnation of the RFL adhesive may increase.

  The resin adhesion amount of the adhesive to the organic fiber cord is preferably in the range of 0.5 to 5% by weight, and more preferably in the range of 0.7 to 4% by weight. Further, the total resin adhesion amount of the first bath and the second bath is preferably in the range of 1.0 to 15% by weight, more preferably 1.5 to 8.0%. If the resin adhesion amount is too low, the adhesiveness may decrease.On the other hand, if the resin adhesion amount is too high, the cord may become hard and the fatigue resistance may decrease. A gum up of a solid content may occur, and the operation stability may deteriorate.

  In order to control the amount of resin adhering to the organic fibers, for example, a method such as squeezing with a pressing roller, scraping off with a screver, blowing off with compressed air, and suction can be used. There is no limitation as long as it satisfies the range of the present invention, but it is preferable to use a pressure roller in that the cord compression ratio and the RFL impregnation degree are easily adjusted. 2.0 kPa / dTex. In order to easily control the resin adhesion amount, the roller pressure is preferably low, more preferably 0.1 to 0.5 kPa / dtex, and further preferably 0.1 to 0.3 kPa / dtex. . When the roller pressure is equal to or higher than the lower limit, it is possible to control the adhesive amount, and when the roller pressure is equal to or lower than the upper limit, the infiltrated RFL is not excessively squeezed out, and the code compression ratio is reduced. , RFL impregnation is in a preferred range. Also, in order to increase the resin adhesion amount, it may be attached plural times. The cord tension at the time of applying the resin is preferably about 0.05 to 0.5 cN / dTex, more preferably 0.05 to 0.2 cN / dtex.

  The organic fiber cord provided with the RFL adhesive is dried at 70 to 150 ° C. for 0.5 to 5 minutes (dry processing), and then heat-treated at 200 to 255 ° C. for 0.5 to 5 minutes (hot processing). In order to control the physical properties of the cord, it is preferable to perform a heat treatment at 200 to 255 ° C. for 0.5 to 5 minutes (hereinafter referred to as a normalizing process). In this way, a film of an adhesive can be formed on the fiber surface, but in some cases, drying can be omitted. If the temperature of the hot treatment and the normalizing treatment is less than 200 ° C., the formation of a film by an adhesive on the fiber and the adhesion to rubber may be insufficient. It is not preferable because the coating film formed by the formed processing agent is deteriorated to lower the adhesive strength, and the organic fiber is thermally deteriorated to lower the strength. The cord tension during the dry treatment is preferably 0.1 to 2.0 cN / dTex. Outside of this range, the code compression ratio and the degree of impregnation may fall outside the preferred ranges, and the strength may decrease.

  According to the present invention, an organic fiber cord having improved fatigue resistance during the rubber vulcanization step or during use of a product, and having practically sufficient adhesion to rubber can be obtained. Therefore, the rubber product containing the organic fiber cord of the present invention has practically sufficient adhesive strength between the organic fiber cord and the rubber, and can effectively reinforce the rubber product. Useful. Therefore, the rubber product containing the organic fiber cord according to the present invention can withstand long-term severe use when used as a tire, belt and hose.

  Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In the present invention, methods for measuring and evaluating physical properties of the organic fiber cord are as described below.

(1) Resin Adhesion Weight The weight (A) of the twisted cord per fixed length is measured in advance, and the weight (B) of the same length of the cord after the adhesive treatment is measured. The resin adhesion amount was calculated according to the calculation formula.
Resin adhering amount = [(BA) / A] × 100 (%)

(2) T-adhesive strength (normal condition and forced deterioration condition)
It shows the adhesive strength between the processing cord and the rubber. According to the adhesive force-A method of JIS L-1017 (2002), the treated cord is embedded in unvulcanized rubber, and under pressure, press vulcanization is performed under normal conditions at 150 ° C. for 30 minutes. After press vulcanization for 70 minutes and allowing to cool, the cord was pulled out of the rubber block at a speed of 300 mm / min, and the weight required for the pulling out was indicated in N / cm.

The composition of the rubber compound used for the measurement of the T-adhesive strength is as follows.
Natural rubber (RSS # 1): 80 (parts by weight)
SBR (JSR1501): 20 (parts by weight)
RF carbon black: 50 (parts by weight)
Stearic acid: 2 (parts by weight)
Sulfur: 2 (parts by weight)
Zinc flower: 5 (parts by weight)
2,2'-dithiobenzothiazole: 4 (parts by weight)
Naphthenic acid process oil: 3 (parts by weight).

(3) Fatigue resistance in rubber (normal conditions and forced deterioration conditions)
It was evaluated by JIS-L1017 (2002) Annex 1 2.2.2 Disk fatigue strength (Goodrich method). Two treatment cords are embedded in rubber for tires and vulcanized at 150 ° C. for 30 minutes to prepare a rubber composite. The deformation of this test piece under normal conditions was 6.3% compression and 12.6% elongation as one cycle, and the forced deterioration condition was deformation under 12.6% compression and 12.6% elongation as one cycle. After giving for 48 hours at a cycle / minute, the cord was taken out of the rubber, the breaking strength after fatigue was measured, and it was represented by the retention before and after the fatigue test.

(4) Code compression ratio After measuring the initial code gauge by JIS-L1017 (2002) 8.1 code gauge, a load of 0.15 cN / dTex was applied in the cross-sectional direction of the cord, and the compressed code gauge was measured. After compression, the code gauge was divided by the initial code gauge to calculate the code compression ratio.

(5) Degree of impregnation Using a microtome, the treated cord was cut in a direction perpendicular to the length direction to obtain a thin piece having a thickness of 20 µm. Subsequently, the cross section of the treated cord was observed using an optical microscope having a magnification of 200 times. The area of a first polygon formed by connecting the outermost monofilaments at the cross section of the processing cord, and connecting the monofilaments that only partially contact the RFL adhesive at the cross section of the processing cord; The area of each of the second polygons formed by was measured. Subsequently, the degree of impregnation of the adhesive into the plied yarn was calculated using the following equation:
P = [(A1-A2) / A1] × 100 (%)
Here, P is the degree of impregnation of the RFL adhesive into the ply-twisted yarn, and A1 is formed by connecting the outermost monofilaments in a cross section of the processing cord perpendicular to the length direction of the processing cord. In the area of the first polygon, A2 is the area of the second polygon formed by connecting each monofilament that only partially contacts the RFL adhesive in the cross section of the treatment cord.

(Examples 1 to 6), (Comparative Examples 1 to 6)
A silicate compound as a smectite was dispersed in water to prepare a 2 w% aqueous dispersion having a thixotropic index of 5. The polyepoxide compound, the rubber latex, and the aqueous dispersion of the silicate compound were mixed at a solid content ratio shown in Table 1 to prepare a primer treatment agent having a solid content concentration shown in Table 1. Further, a resorcinol-formalin precondensate (RF) and a rubber latex were mixed at a 1/5 solid content to prepare an RFL adhesive having a solid content concentration shown in Table 1. The preparation method of the RFL adhesive is as follows. The precondensate (RF) of resorcinol (R) and formalin (F) has a molar ratio of (R / F) of 1/2, a solid concentration of 20% by weight, and is aged for 6 hours under a commonly used alkali catalyst. The obtained resorcinol-formalin precondensate was used. Thereafter, a rubber latex was added to adjust the solid content to 20%, and after aging for 24 hours, ion-exchanged water was added to prepare an RFL adhesive having a desired solid content.
Polyepoxide compound: EX-421 (manufactured by Nagase ChemteX)
Silicate compound: "Lucentite" SWF (manufactured by Corp Chemical)
Rubber latex: 2518FS (manufactured by Zeon Corporation)

  Two 1100 dTex polyester multifilament yarns (“Tetron” 1100-240-705M manufactured by Toray Industries, Inc.) were twisted with the number of twists shown in Table 1 to obtain an untreated cord.

  The untreated cord is immersed in the above-mentioned primer treating agent using a computer treating machine (manufactured by CA Ritzler Co., Ltd.), dried at 120 ° C. for 2 minutes (drying treatment), and subsequently heat-treated at 240 ° C. for 1 minute. (Hot treatment). Table 1 shows the roller pressure, cord tension during immersion, and cord tension during dry processing. Subsequently, after being immersed in the RFL adhesive, it is dried at 120 ° C. for 2 minutes (drying treatment), subsequently heat-treated at 240 ° C. for 0.5 minute (hot treatment), and further heat-treated at 240 ° C. for 0.5 minute ( (Normalization processing). Table 1 shows the roller pressure, cord tension during immersion, and cord tension during dry processing.

  The resin adhesion amount, T-adhesive strength, fatigue resistance in rubber, cord compression ratio, and impregnation degree of the obtained treated cord were measured. Table 1 shows the results.

  As shown in the results of Table 1, in the case of Examples 1 to 6 according to the present invention, the fatigue resistance in rubber is better than that of conventional organic fibers (Comparative Examples 1 to 6), and the adhesion is better. It can be seen that it is.

Claims (4)

Twisted cords having a ply twist and a ply twist, a ply twist coefficient of 1000 to 2500, and a ply twist of 1500 to 3600 are coated with an adhesive containing resorcinol-formalin rubber latex (RFL). An organic fiber cord, wherein a primer treatment agent is attached between an adhesive containing resorcinol, formalin, rubber latex (RFL) and a ply-twisted cord, and the primer treatment agent contains smectite, and the cord compressibility is low. An organic fiber cord characterized in that the cord has an RFL impregnation degree of 83 to 97% and the inside of the cord has an RFL impregnation of 10 to 50%.   The organic fiber cord according to claim 1, wherein the organic fiber includes at least one selected from polyethylene terephthalate, nylon 66, and aramid.   3. The organic fiber cord according to claim 1, which is used for reinforcing rubber.   A rubber product comprising the organic fiber cord according to claim 1.