JP3181756B2 - Method for treating aromatic polyamide fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating an aromatic polyamide fiber as a reinforcing fiber for a power transmission belt. In particular, the present invention relates to a belt having a form in which an aromatic polyamide fiber for reinforcing a belt is exposed from a side surface of a belt, such as a timing belt and a low-edge V-belt. When forming a belt by cutting into a shape, a single yarn is not frayed from the aromatic polyamide fiber exposed on the end face of the belt cut in the fiber axis direction, the adhesion to the matrix rubber is good, and the fatigue resistance is excellent. The present invention relates to a method for treating an aromatic polyamide fiber.

[0002]

2. Description of the Related Art Aromatic polyamide fibers generally have excellent properties such as strength, elastic modulus, dimensional stability and heat resistance, and are used under severe conditions for rubber composites such as tires, belts and hoses. Useful as an excellent reinforcing fiber. In particular, aromatic polyamide fibers are increasingly expected as lightweight reinforcing fibers replacing steel and wires because of their high specific strength and specific elastic modulus.

In general, when aromatic polyamide fibers are used as a reinforcing fiber for a timing belt or a low-edge V-belt, the aromatic polyamide fibers are formed into a tubular shape and then vulcanized by cutting with a cutter into a ring-shaped aromatic polyamide fiber reinforced rubber composite. The belt is formed, but at that time, each single yarn constituting the fiber from the aromatic polyamide fiber exposed on the cut surface is frayed, and may protrude from the side surface of the belt,
In this case, the quality of the belt is significantly reduced. If the belt is operated as it is on a pulley, the single yarn frayed portion may be rubbed by the pulley, and the frayed single yarn may be scattered, or the durability of the belt may be reduced due to the fraying.

[0004] These disadvantages are prevented by the operation of mechanically removing or cutting each of the frayed single yarns during the belt production process. However, the addition of such operations significantly increases the productivity of the belt. This has been a major obstacle to adapting aromatic polyamide fibers to this field. On the other hand, in order to improve such disadvantages of the aromatic polyamide, attempts have been made to treat the aromatic polyamide fiber with a treating agent such as rubber latex to prevent fraying of a single yarn at the time of cutting (Japanese Patent Laid-Open No. Hei 1-207480).
JP-A-4-29644), and other drawbacks such as poor twisting properties of aromatic polyamide fibers, lowering the inherent strength, and impairing adhesion and durability are satisfactory. No results were obtained. The inventor of the present invention also treated the aromatic polyamide fiber with a polyepoxide compound, treated it with a treating agent containing RFL, twisted it, and further refined it.
Although a method of processing by FL treatment has been proposed, the fraying property and adhesiveness are remarkably improved, but there is still room for improvement in fatigue resistance.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for treating an aromatic polyamide fiber for obtaining a power transmission belt which has solved the problems in the prior art. That is, it is an object of the present invention to provide a processing method that prevents fraying of a single yarn of an aromatic polyamide fiber exposed on an end face of a belt at the time of forming a belt, improves adhesion to a matrix rubber, and does not reduce fatigue.

[0006]

According to the present invention, there is provided a method comprising:
The aromatic polyamide fiber is treated in a substantially untwisted state with a treatment solution containing a polyepoxide compound containing two or more epoxy groups and heat-treated at 150 to 260 ° C. for 30 to 210 seconds, and then resorcinol-formalin rubber latex (RF
L), after treating with a treating agent containing a fluororesin and an antioxidant or an antioxidant, drying and curing, 0.2 ≦ K ≦
1 (K = (T × D1 / 2) / 2874, K; Twisting coefficient, T;
The number of twists represented by the number of twists / m, D: denier) is twisted within the range, and then a plurality of these twisted cords are combined in the same direction as the twisted cord within the range of 1 ≦ K ≦ 5. Twist processing,
A method for treating aromatic polyamide fibers, further comprising treating with an treating agent containing RFL.

The rubber latex in the RFL is preferably acrylonitrile-butadiene (NBR) and / or hydrogenated acrylonitrile-butadiene (H-NB).
R, a nitrile group-containing highly saturated copolymer rubber).

(Claim 3) The fluororesin is a tetrafluoroethylene copolymer (PTFE), a trifluorinated ethylene copolymer, a tetrafluoroethylene / hexafluoropropylene copolymer, a tetrafluoroethylene. At least one selected from the group consisting of a perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene / hexafluoropropylene / perfluoroalkyl vinyl ether copolymer, a vinylidene fluoride copolymer, and an ethylene / tetrafluoroethylene copolymer The method for treating an aromatic polyamide fiber according to claim 1. ".

The aromatic polyamide fiber means a fiber made of a polymer in which the repeating unit having an aromatic ring comprises at least 80% or more of the whole, including an aromatic polyamide hydrazide fiber. For example, a fiber composed of a polymer or a copolymer composed of one or more of the repeating units represented by the following general formula can be mentioned.

[0010]

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Here, R 1 and R 2 may be the same or different and are selected from a hydrogen atom and an alkyl group having 5 or less carbon atoms. Examples of the alkyl group having 5 or less carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, and a pentyl group, and are preferably a hydrogen atom. The following general formula can be exemplified as Ar.

[0012]

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Examples of the aromatic ring include 1,4-phenylene group, 1,3-phenylene group, 4,4′-biphenylene group, 1,5-naphthylene group, 2,6-naphthylene group,
Examples thereof include a 2,5-pyridylene group and the like, and preferably a 1,4-phenylene group.

The aromatic ring includes, for example, a halogen group (eg, chlorine, bromine, fluorine), a lower alkyl group (methyl group, ethyl group, isopropyl group, n-propyl group), a lower alkoxy group (methoxy group, ethoxy group), and cyano group. Group, acetyl group, nitro group and the like may be contained as a substituent.

Representative examples of fibers comprising these polymers or copolymers include polyparaaminobenzamide, polyparaphenylene terephthalamide, polyparaaminobenzhydrazide terephthalamide, polyterephthalic acid hydrazide, polymetaphenylene isophthalamide and the like. And fibers made of the copolymer of the above.

The aromatic polyamide fiber is treated with a first treating agent containing a non-twisted polyepoxide compound containing two or more epoxy groups. The polyepoxide compound is a compound containing at least two epoxy groups per molecule in an amount of 0.2 g equivalent or more per 100 g of the compound.Ethylene glycol, glycerol, sorbitol, pentaerythritol, polyhydric alcohols such as polyethylene glycol and epichlorohydrin Reaction products with halogen-containing epoxides, such as reaction products of polyhydric phenols such as resorcinol bis (4-hydroxyphenyl) dimethylmethane, phenol-formaldehyde resin, and resorcinol-formaldehyde resin with the halogen-containing epoxides; Polyepoxide compounds obtained by oxidizing unsaturated compounds with peracetic acid or hydrogen peroxide, such as 3,4-epoxycyclohexene epoxide, 3,4-epoxycyclohexylmethyl-3,4-epoxide Shi cyclohexene carboxylate, bis (3,4-epoxy-6-methyl - cyclohexyl methyl) adipate, etc. can be mentioned. Of these, a reaction product of a polyhydric alcohol and epichlorohydrin, that is, a polyglycidyl ether compound of a polyhydric alcohol is particularly preferred because of excellent performance.

Such a polyepoxide compound is usually dissolved in a small amount of a solvent and used as an emulsion or solution using a known emulsifier, for example, sodium alkylbenzenesulfonate, dioctylsulfosuccinate Na salt, or the like. Polyepoxide compounds are amine-based, imidazole-based curing agents or polyisocyanates and known oximes, phenols, ethylene urea which is a semi-active compound with ethylene imine as described below. Can be mixed and used.

A polyepoxide compound (A) and a curing agent,
Blocked isocyanate or ethylene urea (B)
Is 0.05 ≦ (A) / [(A) + (B)] ≦
A range of 0.9 (weight ratio) is preferred. The concentration of the polyepoxy compound is from 0.1 to 5.0%. Total solids concentration is 1-30% by weight, preferably 3-20% by weight
Use it so that

The treating agent containing the polyepoxide compound is usually mixed with an oil agent during the production of the aromatic polyamide fiber and allowed to adhere thereto, or after the production of the aromatic polyamide fiber,
Attached independently. The solid adhesion amount to the aromatic polyamide fiber is controlled at 0.05 to 5.0% by weight, dried at 100 to 150 ° C for 60 to 180 seconds, and then treated at 150 to 250 ° C for 30 to 210 seconds. Preferably it is 60 to 180 seconds.

The aromatic polyamide fiber treated with the polyepoxy compound is subsequently treated with RFL (resorcin formalin latex) as a second treating agent, a silicone treating agent and an adhesive containing an antioxidant or an antioxidant. You. RFL has a molar ratio of resorcinol to formaldehyde of 1: 0.1 to 1: 8, preferably 1: 0.5 to 1:
5, more preferably in the range of 1: 1 to 1: 4. The mixing ratio of resorcinol-formalin and rubber latex is preferably in the range of 1: 1 to 1:15, and more preferably 1: 3 to 1:12 in terms of solids weight ratio. If the compounding ratio of the rubber latex is too high, the tackiness is remarkably increased and the cohesive strength is reduced, which adversely affects the twisting property and the adhesiveness. Conversely, if the compounding ratio of the rubber latex is too low, the cord becomes hard and the strength and the fatigue are reduced. The type of rubber latex is selected depending on the type of rubber of the adherend. For example, if the rubber of the adherend is CR, CR latex is used, and if NBR or H-NBR, NBR latex and / or hydrogenated NBR latex are used. C
For SM, CSM latex is often used. Of course, a mixture of these rubber latexes may be used.

The fluororesin is a tetrafluoroethylene copolymer (PTFE), a trifluorinated ethylene copolymer, a tetrafluoroethylene / hexafluoropropylene copolymer, a tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer. At least one selected from the group consisting of a polymer, a tetrafluoroethylene, a hexafluoropropylene, a perfluoroalkyl vinyl ether copolymer, a vinylidene fluoride copolymer, and an ethylene, tetrafluoroethylene copolymer; Is preferably used.

The fluororesin is usually used in an aqueous dispersion,
0.5 to 20.0% by weight of PTFE solid content based on FL
Is added. Preferably, it is added at 1.0 to 15.0% by weight, more preferably 5.0 to 10.0% by weight. If the amount is too small, the effect of improving the strength at the time of twisting is small, and if it is too large, the adhesiveness is inhibited and the effect of preventing fraying is reduced.

The antioxidant or antioxidant is RF.
5.0 to 15.0% by weight of solid content is added to L. Examples of the type of the antioxidant include hindered phenol-based, amine-based, phosphorus-based and sulfur-based compounds. As a typical example, in the case of a hindered phenol compound, triethylene glycol bis [3- (3-t
-Butyl-6-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate], 2,4-bis- (n-octylthio) -6- (4-hydroxy-3,5-di-t-butylanily-1,3,5-triazine, pentaerythrityl-tetrakis [3- (3 , 5-Di-t-butyl-4-hydroxyphenyl) propionate], 2,2-thio-
-Diethylenebis [3- (3,5-di-t-butyl-4)
-Hydroxyphenyl) propionate], octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, N, N'-hexamethylenebis (3,5-di-t-butyl-4-) Hydroxy-hydroxycinnamamide), 1,3,5-trimethyl-2,
4,6-tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene and the like can be mentioned. As a hindered phenol compound containing sulfur or phosphorus in the molecule, 2,2-thiobis (4-methyl-6-t
-Butylphenol) and 3,5-di-t-butyl-4-
Hydroxybenzylphosphonate-diethyl ester and the like. Representative examples of amine antioxidants are N,
N′-di-sec-butyl-p-phenylenediamine,
And alkylated diphenylamine.

Examples of the antioxidant include aldehyde-amine reaction products. Representative examples thereof include condensates of aldol and 1-naphthylamine, and ketone-amine reaction products such as 2, 2, 4 -Trimethyl-1,2-dihydroquinoline polymer. N, N'-dinaphthyl-p-phenylenediamine is a typical example of an amine compound. As the phenolic compound, styrenated phenol, 2,6-di-t-butylmethylphenol, 2,2′-methylenebis (4-methyl-6-t-butylphenol), 4,4′-thiobis (3-methyl- 6-t-butylphenol) and the like.

After being treated with a treating agent containing RFL, a fluororesin and an antioxidant or an antioxidant, 80 to 150
℃, dried for 0.5-5 minutes, 150-260 ℃, 0.5
Heat treat and cure for ~ 5 minutes. The amount of RFL that is the second treatment agent attached to the aromatic polyamide fiber is 1 to 25%,
Preferably it is adjusted to 5 to 20%. When the adhesion rate is lower than 1%, when the aromatic polyamide fiber is used as the reinforcing fiber of the power transmission belt, the single yarn exposed from the end face of the belt may be frayed.
The strength utilization rate at the time of twisting the treated aromatic polyamide fiber is low, and the strength is not sufficiently exhibited.

Thus, the polyepoxide compound followed by R
FL-treated aromatic polyamide fibers continue to be 0.2
Twisting treatment is performed within the range of ≦ K ≦ 1 (K = (T × D1 / 2) / 2874, K: twist coefficient, T: number of twists expressed in times / m, D: denier). A plurality of ply twisted cords are combined and twisted in the same direction as the ply twisted cord within a range of 1 ≦ K ≦ 5. Multiply. The twisted aromatic polyamide fiber cord is further treated with an adhesive containing RFL (resorcin formalin latex). RFL is second
Similar to RFL as the treating agent, the molar ratio of resorcinol to formaldehyde is from 1: 0.1 to 1: 8, preferably 1: 1.
It is used in the range of 0.5 to 1: 5, more preferably 1: 1 to 1: 4. The compounding ratio of resorcinol-formalin and rubber latex was 1: 1 to 1: 1 in terms of solids weight ratio
5, preferably in the range of 1: 3 to 1:12. The type of rubber latex is selected according to the type of rubber latex used for RFL as the second processing agent. In this RFL, as shown in JP-B-57-21587, the general formula

[0027]

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(Wherein R ′ is an aromatic or aliphatic hydrocarbon residue, n is 0, 1 or 2) and an aromatic or aliphatic isocyanate and an oxime, phenol, caprolactam or the like. A blocked isocyanate obtained by the reaction may be added for use. Ethylene urea compounds are usually RF dispersed in aqueous dispersion
0.5 to 30% by weight based on L. Further, an aqueous dispersion of carbon black prepared by a usual method is subjected to RFL.
May be added in an amount of 0.5 to 5% by weight. RF
After being treated with L, it may be further treated with rubber glue containing the same type of rubber as the rubber matrix of the adherend.

After the above-mentioned RFL treatment, at 80 to 150 ° C.
After drying for 0.5 to 5 minutes, 150 to 260 ° C, 0.5 to 5
Heat treat for a minute and cure. The amount of RFL attached to the twisted cord is adjusted to 1 to 10% by weight.

After the aromatic polyamide fiber is treated with the polyepoxide compound containing two or more epoxy groups, it is treated with RFL, and then plied to a predetermined number of twists.
In addition, multiple twisted cords are twisted together in the same direction as the twisted cord, and further treated with RFL to prevent fraying of single yarn from the end face of the aromatic polyamide fiber reinforced power transmission belt. Further, not only the adhesive strength with the matrix rubber is improved, but also the fatigue resistance is remarkably improved. The epoxide compound and RFL react with each other to form a relatively flexible film having a high cohesive force, and at the same time, to coat a single yarn of the aromatic polyamide fiber one by one and to adhere firmly. It is presumed that the frayability is improved. Further, it is considered that the PTFE agent has a good twisting property and a high cord strength because the friction property is reduced. In addition, by preparing a twisted cord having a small twisting coefficient in advance, and by twisting a plurality of these twisted cords in the same direction, the single yarn can be aligned well. Therefore, it is considered that the elongation / compression strain during fatigue is uniformly applied and the stress is dispersed at the same time as the cord strength is increased, which leads to a remarkable improvement in fatigue. Further, it is presumed that the antioxidant or antioxidant added to the RFL also prevents the hardening of the aromatic polyamide fiber as the reinforcing fiber due to the hardening of the RFL during running of the belt, which has also contributed to the improvement in fatigue. Is done.

[0031]

As described above, the aromatic polyamide fiber treated by the method of the present invention has a small decrease in strength, and does not cause fraying of a single yarn from the belt end face after forming the power transmission belt, and has good adhesion and fatigue to the matrix. Relatively good. Hereinafter, the present invention will be described specifically with reference to examples. In the examples, the cord strength, fraying property, cord peeling adhesive strength, pull-out adhesive strength, and fatigue strength retention are values obtained as follows.

Using a 4D air chuck using a cord strong Intesco 2005 type tensile test (manufactured by Intesco Corporation), the distance between the chucks is 250 m.
The cord length was taken as m, and the cord strength was measured at a tensile speed of 100 mm / min. The measurement was performed five times, and the average value was defined as the code strength.

Fraying The above-mentioned fraying treatment is performed between two rubber sheets having a thickness of about 2 mm, and then aromatic polyamide cords treated with an adhesive containing RFL are arranged in parallel and sandwiched at 50 ° C. for 30 minutes at 150 ° C. The rubber sheet was obtained by vulcanization under a press pressure of cm2. This sheet was cut in the length direction of the cords arranged in the rubber using a cutter knife so that the end faces of the cords appeared on the cut surface. Then, the state of the single yarn of the aromatic polyamide fiber projecting from the end face was visually determined. Further, the end face was rubbed with sandpaper (# AA-150) to observe the frayed state of the single yarn. Evaluation is good ◎ → ○ → △ → ×
(Poor) was determined.

Cord Peeling Adhesion This shows the peeling adhesion between the treated cord and rubber. 7 cords are buried near the surface of the rubber sheet.
After vulcanizing at 50 ° C. for 30 minutes at a pressing pressure of 50 kg / cm ² , the two cords at both ends were removed, and the remaining five cords were peeled off from the rubber sheet at a speed of 200 mm / min by a force of kg / 5. It is displayed in a book.

Pull-out adhesive strength Indicates the shear adhesive strength between the treatment cord and rubber.
Embed the cord in a rubber block and press at 150 ° C,
The cord was vulcanized at a pressing pressure of 50 kg / cm ² for 30 minutes, and then the cord was pulled out of the rubber block at a speed of 200 mm / min. The force required for drawing was expressed in kg / cm 2.

Strength retention during fatigue A measure of fatigue resistance using a belt-type fatigue tester to sandwich a cord between two rubber sheets having a thickness of 2 mm.
The sheet obtained by vulcanizing at 50 ° C. for 30 minutes at a pressing pressure of 50 kg / cm ² was cut into a belt having a width of 50 mm × 500 mm, applied with a load of 25 kg, mounted on a roller of 20 mmφ, and reciprocated at 120 rpm in an atmosphere of 120 ° C. After exercising and repeating 500,000 times, the cord was taken out, the remaining strength was measured, and the strength retention at fatigue was determined.

[0037]

Example 1, Comparative Examples 1 to 3 First, an adhesive treatment agent was prepared as follows.

That is, 17.5 g of Denacol EX-313 (glycerin diglycidyl ether, manufactured by Nagase Kasei Co., Ltd.) was added to Neocol SW-30 (sodium salt of dioctyl sulfosuccinate, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) as a surfactant.
Add 4.5 g and stir well to dissolve. Then 656.2g of water
While stirring at high speed, the above epoxy solution is slowly added to disperse. The obtained mixture is used as the first treatment agent.

Further, 6.4 g of a 10% aqueous sodium hydroxide solution and 18.8 g of a 28% aqueous ammonia solution were added to 202.2 g of water, stirred sufficiently, and further reacted with an acidic catalyst to obtain resorcinol.
39.5 g of formalin precondensate (40% acetone solution) is added, and the mixture is sufficiently stirred and dispersed. Next, 400.7 g of Nippol LX-1562 (acrylonitrile-butadiene copolymer rubber latex 41% aqueous emulsion, manufactured by Zeon Corporation) is slowly stirred and mixed with 278.0 g of water. The above-mentioned resorcinol-formalin initial condensate dispersion was mixed with this mixed solution while stirring slowly, and further 16.4 g of formalin (37%) was mixed.
Add and mix. PTFE contains 30 g of an aqueous dispersion (20% concentration) and 25% of a hindered phenolic antioxidant (Irganox 1010, manufactured by Ciba Geigy Co., Ltd.)
8 g of an aqueous dispersion are added. The obtained mixed solution having a concentration of 20% is used as a second treating agent.

An aromatic polyamide fiber (manufactured by Technora Teijin Limited) of 1500 denier / 1000 filaments was immersed in the first treatment agent using a computer treating machine (tire cord processing machine manufactured by CA Ritzler Inc.). After drying at 235 ° C for 2 minutes, it was heat-treated at 235 ° C for 1 minute. Next, it is immersed in the second treatment agent, dried and heat-treated under the same conditions as the first treatment agent, and then a twist coefficient of 0.4 (3 times / 10 cm) is applied to the treated yarn in the S direction. The two pieces were twisted together in the S direction at a twist factor of 2 (10.5 turns / 10 cm).

Then, the twisted cord was changed to RFL (R / F = 1).
/2.5 mol ratio, RF / L = 1/5 weight ratio, L = acrylonitrile-butadiene copolymer rubber latex; Nipol LX1562, manufactured by Nippon Zeon Co., Ltd.) so that the adhesion ratio to the twisted cord becomes 5%. Adjusted to 130
C. and dried at 240.degree. C. for 2 minutes and subjected to a curing heat treatment under tension.

The strength of the obtained adhesive treatment cord was measured,
Then, the same H-NBR-compounded rubber sheet is arranged in parallel on a H-NBR-compounded rubber sheet having a thickness of about 2 mm, and the same H-NBR-compounded rubber sheet is overlaid on the cord at 50 ° C. for 30 minutes at 50 kg / cm.
Vulcanization was performed at a pressing pressure of 2 to obtain a rubber sheet. This sheet was cut in the length direction of the cords arranged in the rubber using a cutter knife so that the end faces of the cords appeared on the cut surface. Then, the state of the single yarn of the aromatic polyamide fiber projecting from the end face was visually determined. Further, the end face was rubbed with sandpaper (# AA-150) to observe the frayed state of the single yarn. The evaluation was (good) ◎ → ○ → △ → × (poor).

Further, the peel adhesive strength, the pull-out adhesive strength, and the fatigue strength by a belt fatigue tester were measured using the above-mentioned methods. Table 1 shows the results.

An antioxidant is added to the second treating agent to form PTFE.
Comparative Example 1 was a cord obtained in the same manner as in Example 1 except that no OH was added, and Comparative Example 2 was a cord obtained in the same manner as in Example 1 except that PTFE was added and no antioxidant was added. A cord obtained in the same manner as in Example 1 except that neither the antioxidant nor PTFE was added was used.
Table 1 also shows the results.

[0045]

[Table 1]

As is clear from Table 1, the aromatic polyamide fiber was treated with a treatment agent containing a polyepoxide compound and RFL, PTFE and an antioxidant, then twisted, then twisted, and further subjected to RFL. It can be seen that the treated cord has high strength and remarkably improved fatigue resistance, and has excellent frayability and adhesiveness.

[0047]

Example 2, Comparative Examples 4 to 6 Among the adhesive treatment agents, the polyepoxide treatment agent as the first treatment agent was adjusted in the same manner as in Example 1.

The RFL of the second treating agent was adjusted to NIPOL 2518FS (vinyl pyridine / styrene / butadiene latex 41% according to the preparation method of Example 1).
(Water emulsion; manufactured by Zeon Corporation).
In addition, both the lower twist and the upper twist are performed in the same manner as in Example 1, and then, as in the case of the second treating agent, the R of the Nipol 2518FS blend is used.
Processed with FL.

An antioxidant is added to the second treating agent to form PTFE.
The cord obtained in the same manner as in Example 2 except that no OH was added was used in Comparative Example 4, and the cord obtained in the same manner as in Example 2 except that PTFE was added and the antioxidant was not added was used in Comparative Example 5, A cord obtained in the same manner as in Example 2 except that both the antioxidant and PTFE were not added was used for comparison.
The treated cord obtained as above was measured for fraying property, peel adhesive strength, pull-out adhesive strength, and fatigue property using the CR compounded rubber according to the method described above. Table 2 shows the obtained results. As is clear from Table 2, even when the type of latex is changed, extremely good fatigue, fraying and adhesive properties are exhibited.

[0050]

[Table 2]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI D06M 15/41 D06M 15/41 15/693 15/693 // B29D 30/20 B29D 30/20 D06M 101: 36 (56) Reference Document JP-A-5-106172 (JP, A) JP-A-6-207380 (JP, A) JP-A-1-207480 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06M 15/00-15/715

Claims (3)

(57) [Claims] An aromatic polyamide fiber is treated in a substantially untwisted state with a treatment liquid containing a polyepoxide compound containing two or more epoxy groups, and is treated at 150 to 260 ° C. for 30 to 210.
After heat treatment for 2 seconds, it is treated with a resorcinol-formalin rubber latex (RFL), a treating agent containing a fluororesin and an antioxidant or an antioxidant, dried and cured, and then 0.2 ≦ K ≦ 1 (K = (T × D1 / 2) / 2874,
K: Twisting coefficient, T: Twisting number expressed in times / m, D: Denier) Twisting treatment is performed within the range, and then a plurality of these ply twisted cords are combined and 1 ≦ in the same direction as the ply twisted cord. A method for treating aromatic polyamide fibers, comprising twisting within a range of K ≦ 5, and further treating with a treatment agent containing RFL. 2. The aromatic polyamide fiber according to claim 1, wherein the rubber latex in the RFL is acrylonitrile-butadiene (NBR) and / or hydrogenated acrylonitrile-butadiene (H-NBR, a highly saturated copolymer rubber containing a nitrile group). Processing method. 3. The fluororesin is a tetrafluoroethylene copolymer (PTFE), a trifluoroethylene chloride copolymer, a tetrafluoroethylene / hexafluoropropylene copolymer, a tetrafluoroethylene / perfluoroalkyl Claims 1 or more selected from the group consisting of vinyl ether copolymer, tetrafluoroethylene, hexafluoropropylene, perfluoroalkyl vinyl ether copolymer, vinylidene fluoride copolymer, ethylene, tetrafluoroethylene copolymer. 1. A method for treating an aromatic polyamide fiber.