JP2003221787A - Polyester cord for reinforcing power transmission belt and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester cord for reinforcing a power transmission belt capable of remarkably improving convergent properties of the cord of a filament single fiber exposed on the end face of the belt, suppressing lowering of adhesion to rubber by exposure to steam and obtaining the belt having good strength and fatigue resistance and to provide a method for producing the polyester cord. <P>SOLUTION: The polyester cord for reinforcing the power transmission belt has an adhesive layer with at least two layers on the fiber surface. The first layer which is the inner layer part of the adhesive layer comprises (A) an aqueous urethane resin, (B) a polyepoxide compound, (C) a blocked polyisocyanate compound and (D) a rubber latex. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester cord for reinforcing a power transmission belt and a method for manufacturing the same. More specifically, when applied as a power transmission belt in which a reinforcing cord such as a timing belt or a low edge V belt is exposed from the side surface of the belt,
Significantly improves the bunching (fraying, flowering) of filament monofilament cords exposed on the end face of the belt, and leaks when forming by steam vulcanization Adhesion with rubber even when exposed to steam , A polyester cord for reinforcing a power transmission belt, and a polyester cord for reinforcing this power transmission belt, which can obtain a belt having good strength, good strength and fatigue resistance, are manufactured in consideration of the environment by using a water-based adhesive. It is about the method.

[0002]

2. Description of the Related Art Polyester fibers and aromatic polyamide fibers have excellent properties such as high strength, high modulus, low elongation, and low creep, so that they have been conventionally used as reinforcing cords for reinforcing power transmission belts. It is used.

Generally, the rubber-reinforcing fiber is put into practical use after twisting a yarn to form a cord, applying an adhesive to the cord, and subjecting the cord to a heat treatment. And
In particular, for reinforcing fibers for belts, such as timing belts and low-edge V-belts, where the reinforcing cords are exposed from the side surface of the belt, epoxy compounds, raw isocyanates, rubber glue, etc. are dissolved in a non-aqueous solvent such as toluene. A method with a large process load is adopted in which rubber is impregnated with the treated agent. In other words, when a water-based treatment agent is used, the adhesive does not easily penetrate into the filament and filament fraying occurs on the side surface of the belt.To prevent this, the non-aqueous treatment agent as described above is used. This is the current situation.

That is, when the adhesive-treated rubber-reinforcing fiber is used as a reinforcing cord for a timing belt or a low edge V-belt, the reinforcing cord is preliminarily formed into a tubular shape and is impregnated with rubber to be vulcanized. After that, the belt is made by successively cutting the tubular shaped reinforcing rubber composite with a cutter into a desired shape, but at that time, the impregnation of the adhesive from the reinforcing cord exposed on the cut surface is insufficient. The filament single fibers may fray and project from the side surface of the belt. In that case, not only the quality of the belt is significantly deteriorated, but when the filament single fiber is used as it is and is driven by a pulley, the filament single fibers fray. Part of the filament rubs against the pulley, and filament filaments that are frayed may scatter, or this fray may cause The durability of the belt is lowered, it was necessary to perform special processing to reinforcing cord as described above.

Various proposals have hitherto been made regarding a method of treating a reinforcing cord with an aqueous adhesive treatment agent.

For example, in Japanese Unexamined Patent Publication (Kokai) No. 8-100370, a treatment liquid containing a polyepoxide compound is applied to an untwisted aromatic polyamide fiber for heat treatment, then twisted, and then a resorcin-formalin initial condensation product. And a rubber latex mixed solution (hereinafter referred to as RFL) are impregnated with an adhesive treatment liquid under vacuum and pressure conditions, and then heat treated,
Further, a method for manufacturing a power transmission belt reinforcing cord by treating with an adhesive treatment liquid containing RFL is described.

Further, in JP-A-8-199484, a twisted aromatic polyamide fiber is passed through a pressure-adhesive treatment agent containing a polyepoxide compound and then heat-treated, and then a treatment liquid containing RFL is applied. Then, a method of manufacturing a power transmission belt reinforcing cord by further heat treatment is described.

However, in the case of using a water-based adhesive treating agent like these conventional methods, in order to prevent the filament monofilament from being frayed from the side surface of the cord, a treating method with a large stroke load as described above. It was the actual situation that I had to use.

[0009]

In view of such background of the prior art, the present invention, when applied as a power transmission belt in which a reinforcing cord such as a timing belt or a low edge V belt is exposed from the side surface of the belt, Significantly improves the bundle sizing (fraying and flowering) of filament monofilament exposed on the belt end face, and suppresses the decrease in adhesion to rubber due to steam exposure, and obtains a belt with good strength and fatigue resistance. An object of the present invention is to provide a polyester cord for reinforcing a power transmission belt and a method for producing the polyester cord for reinforcing a power transmission belt in consideration of the environment by using a water-based adhesive.

[0010]

The present invention employs the following means in order to solve the above problems. That is, the power transmission belt-reinforcing polyester cord of the present invention is a power transmission belt-reinforcing polyester cord having at least two or more adhesive layers on the fiber surface, and is the first layer which is an inner layer portion of the adhesive layer. Is composed of an adhesive layer containing an aqueous urethane resin (A), a polyepoxide compound (B), a blocked polyisocyanate compound (C) and a rubber latex (D).

In the polyester cord for reinforcing the power transmission belt of the present invention, the following conditions (1) to (7) are preferable conditions. By adopting these conditions, a more excellent effect is provided. can do. (1) Adhesion in which the second layer of the adhesive layer contains a mixture (E) of a rubber latex and a resorcin-formalin initial condensation product, a blocked polyisocyanate compound (C) and / or an ethyleneimine compound (F) The polyester cord for reinforcing a power transmission belt according to claim 1, which comprises an agent layer. (2) The water-based urethane resin (A) used in the first adhesive layer is a heat-reactive and / or non-reactive water-based urethane resin. (3) The blocked isocyanate compound (C) used in the first adhesive layer is diphenylmethane diisocyanate blocked with ε-caprolactam. (4) The rubber latex (D) used in the first adhesive layer is a vinylpyridine / styrene / butadiene copolymer latex. (5) The polyepoxide compound (B) used for the first adhesive layer is a polyhydric alcohol sorbitol polyglycidyl ether compound. (6) The fiber adhesion amount relative to the fiber weight of the adhesive is 1
The second adhesive layer is 2.0 to 6.0% by weight, and the second adhesive layer is 1.5 to 4.0% by weight. (7) The power transmission belt reinforcing polyester cord is used. Epoxy compound adheres to the constituent fibers beforehand.

In the method for producing a polyester cord for reinforcing a power transmission belt according to the present invention, the polyester fiber is twisted to form a cord, and the cord is subjected to a heat treatment after applying the first adhesive treatment liquid, and then to the second cord. In the method for producing a polyester cord for rubber reinforcement by applying an adhesive treatment liquid and then subjecting it to heat treatment, 20-30 parts by weight of a water-based urethane resin (A) and a polyepoxide compound (B) 10 are used as the first adhesive treatment liquid. ˜25 parts by weight, 30 to 40 parts by weight of the blocked polyisocyanate compound (C) and 20 to 30 parts by weight of the rubber latex (D) are used, and as the second adhesive treatment liquid,
Mixture (E) 1 consisting of 100 parts by weight of rubber latex and 16 to 25 parts by weight of an initial condensate of resorcin-formalin.
To 100 parts by weight of the blocked polyisocyanate compound (C) and / or the ethyleneimine compound (F)
It is characterized in that a treatment liquid obtained by mixing 20 parts by weight is used.

In the polyester cord for reinforcing the power transmission belt of the present invention, the following conditions (8) to (10) are preferable conditions, and it is expected that the application of these conditions will result in a better effect. Possible (8) The heat treatment after applying the first adhesive treatment liquid is performed in 23
Performing at a temperature of 0 to 255 ° C., and performing heat treatment after applying the second adhesive treatment liquid at a temperature of 220 to 250 ° C. (9) The polyester cord is a ply-twisted cord obtained by combining a plurality of lower-twisted cords and subjecting them to upper-twisting. (10) An epoxy compound has been previously added to the polyester fiber at the stage of spinning.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.

Polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polyethylene 2,6 naphthalate, and copolymers thereof are used as the material polymer of the polyester fiber adopted in the polyester cord for reinforcing the power transmission belt of the present invention. . Among them, polyethylene terephthalate is preferably used from the viewpoint of manufacturing cost. The intrinsic viscosity of the polyethylene terephthalate used here is 0.60 from the viewpoint of smoothing the yarn production and suppressing the cost.
As described above, the polyester fiber may be pretreated by applying only an ordinary oil agent, but is particularly preferably a so-called epoxy pretreated yarn in which an epoxy compound is preliminarily applied at the yarn making stage.

Further, the polyester cord for reinforcing the power transmission belt of the present invention has at least two or more adhesive layers on the fiber surface, and the first layer, which is the inner layer portion of the adhesive layer, is the water-based urethane resin (A ), A polyepoxide compound (B), a blocked polyisocyanate compound (C) and a rubber latex (D), and in the production method described later, this first adhesive layer is formed. The adhesive is referred to as a first adhesive treatment liquid.

Examples of the urethane group-containing compound of the water-based urethane resin (A) used for the first adhesive layer include polyethylene adipate, polypropylene adipate, polyester polyols such as polycaprolactone glycol, polyethylene glycol, polypropylene glycol, polyethylene. A reaction product of polyether polyols such as propylene glycol and polytetramethylene glycol with polyisocyanates such as tolylene diisocyanate, 4-4 ′ diphenylmethane diisocyanate, 1-5-naphthalene diisocyanate, hexamethylene diisocyanate and xylene diisocyanate. Therefore, the one in which the blocking agent is dissociated by the heat treatment and the active isocyanate group is regenerated is used. Among these, reaction products of polyethers and polyesters with aromatic isocyanates are preferably used.

Among them, the water-based urethane resin (A) is
Aromatic isocyanate-based ones that form a tough film with a heat-reactive urethane resin having a blocked isocyanate group in the urethane skeleton and / or a non-reactive urethane resin are preferred.

The epoxy compound previously applied to the polyester fiber in the yarn making step and the polyepoxide compound (B) used in the first adhesive layer are compounds containing two or more epoxy groups in one molecule. Yes, specifically, reaction products of polyhydric alcohols such as glycerol, pentaerythritol, sorbitol, ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol and halogen-containing epoxides such as epichlorohydrin, resorcin, bis. Reaction products of polyhydric phenols such as (4-hydroxyphenyl) dimethylmethane, phenol / formaldehyde resin, resorcin / formaldehyde resin and the halogen-containing epoxides, bis- (3,4-epoxy-6-methyl-di) Black hexyl methyl) adipate,
A polyepoxide compound obtained by oxidizing an unsaturated bond moiety such as 3,4-epoxycyclohexene epoxide. Reaction products of polyhydric alcohols and epichlorohydrin (polyglycidyl ether compounds of polyhydric alcohols) are preferably used, and polyglycidyl ether compounds of polyhydric alcohols are more preferably used.

The blocked polyisocyanate compound (C) used in the first adhesive layer is one in which the blocking agent is liberated by heating to produce an active isocyanate compound. Specific examples thereof include: Polyisocyanate compounds such as tolylene diisocyanate, metaphenylene diisocyanate, diphenyl methane diisocyanate, hexamethyline diisocyanate, triphenyl methane triisocyanate, and phenol,
Reaction products with phenols such as cresol and resorcin, lactams such as ε-caprolactam and valerolactam, oximes such as acetoxime, methylethylketoxime and cyclohexaneoxime, and blocking agents such as ethyleneimine are used. Among these compounds, the aromatic polyisocyanate compound blocked with ε-caprolactam and the aromatic compound of diphenylmethane diisocyanate are preferably used because they give good results.

The rubber latex (D) used in the first adhesive layer is vinyl pyridine / styrene / butadiene terpolymer rubber latex (hereinafter referred to as VP).
A terpolymer rubber latex comprising 15% by weight of a vinylpyridine monomer, 15% by weight of a styrene monomer and 70% by weight of a conjugated diene monomer. , A ternary compound having a special blending ratio of 15% by weight of vinylpyridine-based monomer, 35% by weight of styrene monomer and 50% by weight of conjugated diene-based monomer, as compared with a normal VP latex having a Mooney viscosity of about 40. Polymer rubber latex having a Muni viscosity of 120 V
P-latex is particularly preferred.

The power transmission belt reinforcing polyester cord of the present invention further comprises a second adhesive layer formed on the above-mentioned first adhesive layer, and the second adhesive layer comprises: A mixture of a rubber latex and a resorcin / formalin initial condensation product (E), an adhesive layer containing a blocked polyisocyanate compound (C) and / or an ethyleneimine compound (F), which is described below. In the above, the adhesive forming the second adhesive layer is referred to as a second adhesive treatment liquid.

The mixture of the rubber latex and the resorcin / formalin initial condensate used in the second adhesive layer is usually called RFL, and the rubber latex is used in the transmission belt. It is preferable to select a rubber latex type capable of ensuring adhesiveness with rubber. Specific examples of the rubber latex used include vinylpyridine / styrene / butadiene copolymer rubber latex (VP latex), styrene / butadiene copolymer rubber latex (SBR latex), chloroprene rubber latex (CR latex), and chlorosulfone. Polyethylene rubber latex (CSM latex), ethylene / propylene rubber latex (EP latex), acrylonitrile / butadiene copolymer rubber latex (NBR latex), carboxyl group modified acrylonitrile / butadiene copolymer rubber latex (carbo modified NBR latex) and Natural rubber latex (NR latex) and the like can be mentioned, and these rubber latexes can be used alone or as a blend, as appropriate.

The resorcinol and formalin initial condensate are obtained under an alkaline catalyst, and the molar ratio of resorcinol and formalin is 1: 0.3 to 1: 5, preferably 1: 0.75 to 1 : 2.0. In addition,
When using the novolak type condensate of resorcinol and formalin, it is preferable to dissolve it in an aqueous alkali catalyst solution and then add formalin to obtain the same molar ratio as the initial condensate of resorcinol and formalin.

The compounding ratio of the resorcinol formalin initial condensate and the rubber latex in the RFL is preferably 1: 3 to 1: 8, preferably 1: 4 to 1: 6 in terms of solid content weight ratio.

The second adhesive layer contains RFL (E) and a blocked polyisocyanate compound (C) or / and an ethylene urea compound (F) for improving the adhesiveness.
Formed by a mixture with.

As the blocked polyisocyanate compound (C) used in the second adhesive layer, as in the first adhesive layer, tolylene diisocyanate, metaphenylene diisocyanate, diphenyl methane diisocyanate, hexamethyiene. Polyisocyanate compounds such as phosphorus diisocyanate and triphenylmethane triisocyanate, phenols such as phenol, cresol and resorcin, lactams such as ε-caprolactam and valerolactam, oximes such as acetoxime, methylethylketoxime and cyclohexaneoxime, and ethylene. Examples include reaction products with blocking agents such as imines. Among these compounds, the use of an aromatic polyisocyanate compound blocked with methyl ethyl ketone and an aromatic compound of diphenylmethane diisocyanate give good results and are preferably used.

The ethylene urea compound (F) used in the second adhesive layer is a compound which improves the adhesiveness by reacting with the ethylene imine ring by ring opening due to heating. Typical examples thereof include aromatics such as hexamethylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, and triphenylmethane triisocyanate, and reactive organisms of aliphatic isocyanate and ethyleneimine, and particularly aromatic compounds of diphenylmethanediethyleneurea. Ethylene urea compounds are preferably used because they give good results.

The adhesion amount of the above adhesive to the fiber weight is
The first adhesive layer is 2.0 to 6.0% by weight, preferably 4 to 5% by weight, and the second adhesive layer is 1.5 to 5% by weight.
It is 4.0% by weight, preferably 2.0 to 3.0% by weight.

If the adhesion amount of the first adhesive layer is less than the above range, the focusing property may be deteriorated. If the adhesion amount of the first adhesive layer exceeds the above range, the adhesion amount of the second adhesive treatment liquid is hard to adhere. In some cases, the adhesive strength tends to decrease. .

If the amount of the second adhesive layer deposited is less than the above range, the adhesion of the adhesive rubber after the steam treatment may be deteriorated. May become saturated, and there is a tendency that no further effect can be obtained.

Next, in the method for producing the polyester cord for reinforcing the power transmission belt of the present invention having the above-mentioned structure, the polyester fiber is twisted to form a cord, and the cord is heat treated after applying the first adhesive treatment liquid. And then applying a second adhesive treatment liquid and then performing heat treatment.

As the first adhesion treatment liquid, 20 to 30 parts by weight of the water-based urethane resin (A), 10 to 25 parts by weight of the polyepoxide compound (B), 30 to 40 parts by weight of the blocked polyisocyanate compound (C) and vinyl are used. Pyridine / styrene / butadiene copolymer latex (D) 20
A treatment liquid obtained by mixing 30 to 30 parts by weight is used, and the second adhesive treatment liquid is 100 parts by weight of a mixture (E) consisting of 100 parts by weight of rubber latex and 16 to 25 parts by weight of a resorcin / formalin initial condensate. A treatment liquid prepared by mixing 5 to 20 parts by weight of the blocked polyisocyanate compound (C) and / or the ethyleneimine compound (F) is used.

In the first adhesive treatment liquid, if the amount of the water-based urethane resin (A) is less than the above range, the bundling property (fraying) may be deteriorated. May deteriorate.

When the amount of the blocked polyisocyanate compound (C) and / or the ethyleneimine compound (F) in the second adhesive treatment liquid is less than the above range, the effect of improving the adhesiveness with rubber is unsatisfactory. If it is more than the above range, the strength of the fiber cord may decrease.

In order to attach each of the above-mentioned adhesion treatment liquids to the fiber cord, any method such as dipping, spraying with a nozzle, coating with a roller or the like can be adopted.

In the present invention, it is preferable that the first water-based adhesive treatment agent is applied, followed by heat treatment, and then the second water-based adhesive treatment agent is applied, followed by heat treatment. By this heat treatment, the single yarns of the respective yarns constituting the cord are brought into close contact with each other, and a cord having excellent frayability and fatigue resistance of the single yarn can be obtained. In addition, in this heat treatment process, the cord is 0.1 g / d
It is preferable that the above tension is applied.

The heat treatment temperature after applying the first adhesive treatment liquid is preferably in the range of 230 to 255 ° C., and the heat treatment temperature after applying the second adhesive treatment liquid is preferably in the range of 220 to 250 ° C. .

Before applying the respective adhesive treatment liquids and subjecting them to heat treatment, they may be dried at a temperature of 100 to 150.degree.

Next, an example of the manufacturing procedure of the method for manufacturing the power transmission belt reinforcing cord of the present invention will be described.

First, ordinary polyester fibers without epoxy pretreatment or pretreated yarns to which an epoxy compound has been previously applied at the yarn making stage are aligned in a predetermined number, and a desired number of twists are applied. Then, an untreated ply-twisted cord is obtained by aligning a plurality of the lower-twisted cords and subjecting them to the upper twist.

Next, after applying the untreated cord with the first adhesive treatment liquid, it is heat-treated at a predetermined temperature.

Subsequently, the second adhesive treatment liquid is applied and heat treatment optimal for obtaining adhesiveness with rubber is performed to obtain a power transmission belt reinforcing cord.

According to the power transmission belt reinforcing cord of the present invention thus obtained, when the reinforcing cord such as a timing belt or a low edge V belt is applied as a power transmitting belt in a form exposed from the belt side surface, the belt end surface is It is possible to obtain a belt with excellent strength and fatigue resistance, by greatly improving the bunching property (flaking property, flower blooming property) of the filament monofilament cord exposed to the outside, and suppressing the decrease in adhesion with rubber due to steam exposure. It is possible.

Further, according to the method of manufacturing a cord for reinforcing a power transmission belt of the present invention, the cord for reinforcing a power transmission belt having the above-mentioned excellent performance is environmentally friendly by using an aqueous adhesive treatment agent. It can be manufactured efficiently.

[0046]

EXAMPLES Next, the constitution and effects of the present invention will be specifically described by way of examples.

Each measured value in the examples is obtained by the following method. [Cord Strength] JIS L using a tensile tester "Tensilon" UTM-4L type manufactured by Orientec Co., Ltd.
It was measured based on -1017 (1995). [Parallel peeling adhesive strength (rubber adhesion rate, peeling strength)] Two topping sheets in which cords are punched at a density of 14 / inch are stuck together so that the cords are parallel, and at 150 ° C, 3
Press vulcanize for 0 minutes, allow to cool, then ply both plies 5 cm
The peeling measurement was performed at a pulling speed of / min. In addition, the peel test after steam treatment is performed by placing the press-vulcanized piece in gauze and subjecting it to autoclave at 155 ° C. for 30 minutes,
The measurement was performed at room temperature under the same conditions as those after the press vulcanization. The rubber adhesion rate is the percentage of the area where the rubber is attached to the surface of the cord observed by observing the cord peeled from the rubber with the naked eye, and the peeling force is the force required for peeling to be expressed in N / inch. . [Cord peeling adhesion] 7 near the surface of the rubber sheet
Fill the cord of the book, 150 ℃, 30 minutes, 20kg / c
The force required to peel off three even-numbered cords, which were vulcanized with a press pressure of m ² and then embedded, at a speed of 100 mm / min was expressed as N / 3. In the cord peeling test after steam treatment, the press-vulcanized piece was put in gauze and autoclaved at 155 ° C for 30 minutes, and then measured at room temperature under the same conditions as those after press-vulcanization. [Fatigue resistance] F of JIS L 1017 (1995)
S fatigue test (firestone method) was performed. That is, a topping sheet was obtained in which cords were embedded at an interval of 14 lines / inch between two rubber sheets having a thickness of 1 mm. Two pieces of this topping sheet are piled up so that the cords are parallel to each other, and 150 kg, 30 minutes, 50 kg / cm ²
It was vulcanized under a pressing pressure of No. 2 to obtain a cord / rubber composite having a width of 25 mm and a length of 35 cm. This cord / rubber composite was attached to an FS fatigue tester with a pulley diameter of 25 mm and a load of 50 kg, and after operating at a speed of 250 rpm for 24 hours, the cord strength on the side not in contact with the pulley was measured and the fatigue test was performed. The retention rate for the previous strength was determined. [Focusability] A. Frayability The vulcanized cord / rubber composite was cut in the lengthwise direction of the cords arranged in the rubber using a cutter knife in the same manner as in the parallel peeling force measurement so that the cord end face was exposed on the cut surface. . This end surface is sandpaper (# AA-15
It was rubbed at 0) and the appearance of the filament fraying was observed. Then, the magnitude of the frayed state is evaluated as good ○> somewhat good △ ＞ ×
It was evaluated by the rank of bad.

B. Hanging the cord with the Tsuruguchi tweezers at a position 20 mm from the end of the flower bloom treatment cord, squeeze the tweezers by moving them toward the end, repeating 5 times,
The spreading state of the tip of the single yarn of the filament forming the cord was observed. ○ If no single yarn spread is observed
And evaluated in the order of good ○> somewhat good Δ> × bad.

Examples 1 to 7 First, the adhesive treatment agent was prepared as follows.

As the first bath treatment liquid, sorbitol polyglycidyl ether (Denacol EX manufactured by Nagase Kasei Co., Ltd.) was used.
-614B, as a surfactant, aerosol OT-
An epoxy aqueous solution (EPO) was prepared by adding 75 (dioctyl sulfosuccinate Na salt: manufactured by Kao Soap Co., Ltd.) at an epoxy ratio of 10% by weight, adding water and emulsifying using a homogenizer.

4,4'-diphenylmethane diisocyanate aqueous dispersion (B-NCO) blocked with the above epoxy aqueous solution (EPO) and ε-caprolactam, vinylpyridine / styrene / butadiene latex (VP) and water-based urethane resin (first Industrial Pharmaceutical Co., Ltd. (1) Superflex 830, (2) Superflex E-250
0, (3) Elastron H-38) was mixed at a predetermined ratio shown in Table 1 to obtain a first adhesive treatment liquid. The solid content concentration of this first adhesive treatment liquid is 15.0% by weight.
And

In the presence of caustic soda as the second bath treatment liquid, formalin is added in an amount of 1.00 to 1 mol of resorcin.
The initial condensate obtained by reacting 1.50 mol (F / R mol ratio) was mixed with 100 parts by weight of vinylpyridine-styrene-butadiene latex at a ratio of 20 parts by weight, and 2
Aged for 4 hours.

RFL100 was added to this second adhesive treatment liquid with an aqueous dispersion of 4,4'-N, N'-diphenylmethane diisocyanate blocked with methylethylketoxime.
10 parts by weight was added to parts by weight. As a result, a second adhesive treatment liquid having a solid content concentration of 18% by weight was obtained.

On the other hand, in a solvent of orthochlorophenol,
After melt-spinning polyethylene terephthalate having an intrinsic yarn viscosity of 0.96 measured at 25 ° C., (1) an untreated yarn in which only an oil agent was applied during spinning and (2) an epoxy pretreated yarn in which an epoxy compound was mixed with an oil agent Stretched 1100 decitex, 2 pieces are aligned and subjected to a lower twist of 18 times / 10 cm, and 5 lower twists are combined and an upper twist of 8.5 times / 10 cm
A cord (1100 T // 2/5) was formed by twisting with the number of twists of 1, and was dipped in the first adhesion treatment liquid using a computer treating machine (manufactured by Ritzler) and heat treated at 245 ° C. for 60 seconds. Then, it was immersed in the second adhesive treatment liquid and heat-treated at 240 ° C. for 90 seconds.

Regarding the obtained treatment code, the target adhesion amount of the first bonding treatment liquid is 4.5% by weight, and the target adhesion amount of the second bonding treatment liquid is 2.0% by weight. The wiper was adjusted and processed.

For each of the treated cords obtained as described above, Table 1 also shows the measurement results of the cord peeling adhesive strength, parallel peel adhesion, fatigue resistance, bundling property, strength and the amount of actual adhesive adhered.

The symbol contents in Table 1 are as follows.

A: Water-based urethane resin B: Polyepoxy compound (EPO) C.I. Blocked isocyanate (B-NCO) D: Vinyl pyridine / styrene / butadiene rubber latex (VP) X: Formalin / resocine (molar ratio)

[0059]

[Table 1]

[Comparative Examples 1 and 2] In the examples, the treatment conditions were the same as those of the examples except that the first adhesive treatment liquid containing no water-based urethane resin or rubber latex was used. The results are also shown in Table 2.

[0061]

[Table 2]

[0062]

As described above, according to the power transmission belt reinforcing cord of the present invention, it is applied as a power transmission belt in which a reinforcing cord such as a timing belt or a low edge V belt is exposed from the side surface of the belt. When this is done, it significantly improves the bunching (fraying, flowering) of the filament monofilament cord exposed on the end face of the belt, and suppresses the decrease in adhesion to the rubber due to vapor exposure, and is strong,
It is possible to obtain a belt having good fatigue resistance.

Further, according to the method for manufacturing a power transmission belt reinforcing cord of the present invention, the power transmission belt reinforcing cord having excellent performance as described above is produced by using an aqueous adhesive treatment agent while considering the environment. It can be manufactured efficiently.

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) C09J 163/00 C09J 163/00 175/04 175/04 D06M 13/395 D06M 13/395 15/41 15 / 41 15/53 15/53 15/693 15/693 F16G 5/06 F16G 5/06 A F Term (reference) 4J034 DK00 DK05 DK06 DK08 HA01 HA07 HC03 HC12 HC61 HC64 HC65 HC67 HC71 HD04 HD12 QC03 RA05 RA09 RA11 4J040 CA081 EB031 EC021 EC071 EC201 EF111 EF131 EF291 EF301 EF331 EH011 JA03 MA10 MA12 4L033 AA07 AB03 AC11 BA55 BA91 CA34 CA48 CA50 CA51

Claims (12)

[Claims] 1. A polyester cord for reinforcing a power transmission belt having at least two or more adhesive layers on a fiber surface, wherein the first layer which is an inner layer portion of the adhesive layer is a water-based urethane resin (A), A polyester cord for reinforcing a power transmission belt, which comprises an adhesive layer containing a polyepoxide compound (B), a blocked polyisocyanate compound (C) and a rubber latex (D). 2. The second layer of the adhesive layer comprises a mixture (E) of a rubber latex and a resorcin / formalin initial condensation product, and a blocked polyisocyanate compound (C).
A polyester cord for reinforcing a power transmission belt according to claim 1, characterized by comprising an adhesive layer containing an ethyleneimine compound (F). 3. The water-based urethane resin (A) used in the first adhesive layer is a heat-reactive and / or non-reactive water-based urethane resin. Polyester cord for reinforcing the power transmission belt. 4. The blocked isocyanate compound (C) used in the first adhesive layer is diphenylmethane diisocyanate blocked with ε-caprolactam, according to any one of claims 1 to 3. Polyester cord for reinforcing the power transmission belt. 5. The rubber latex (D) used in the first adhesive layer is a vinylpyridine / styrene / butadiene copolymer latex, according to any one of claims 1 to 4. Polyester cord for reinforcing the power transmission belt. 6. The polyepoxide compound (B) used in the first adhesive layer is a sorbitol polyglycidyl ether compound of polyhydric alcohol, according to any one of claims 1 to 5. Polyester cord for reinforcing the power transmission belt. 7. The amount of the adhesive adhered to the fiber weight is 2.0 to 6.0% by weight in the first adhesive layer and 1.5 to 4.% in the second adhesive layer. The polyester cord for reinforcing a power transmission belt according to claim 1, wherein the polyester cord is 0% by weight. 8. The polyester cord for reinforcing a power transmission belt according to any one of claims 1 to 7, wherein an epoxy compound is preliminarily adhered to the fibers constituting the polyester cord for reinforcing the power transmission belt. 9. A polyester fiber is twisted to form a cord, and the cord is subjected to a heat treatment after applying a first adhesive treatment liquid, then a second adhesive treatment liquid, and then a heat treatment. In the method for producing a rubber-reinforced polyester cord, as the first adhesive treatment liquid, 20 to 30 parts by weight of an aqueous urethane resin (A), 10 to 25 parts by weight of a polyepoxide compound (B), and a blocked polyisocyanate compound (C) are used. A treatment liquid prepared by mixing 30 to 40 parts by weight and 20 to 30 parts by weight of rubber latex (D) is used, and 100 parts by weight of rubber latex and resorcin-formalin initial condensate 16 are used as the second adhesive treatment liquid. To 100 parts by weight of the mixture (E) containing 25 to 25 parts by weight of the blocked polyisocyanate compound (C) and / or ethylene. A method for producing a polyester cord for reinforcing a power transmission belt, which comprises using a treatment liquid prepared by mixing 5 to 20 parts by weight of an imine compound (F). 10. The heat treatment after applying the first adhesive treatment liquid is performed at a temperature of 230 to 255 ° C., and the heat treatment after applying the second adhesive treatment liquid is performed at a temperature of 220 to 250 ° C. The method for producing a polyester cord for reinforcing a power transmission belt according to claim 9, wherein 11. The polyester cord for reinforcing a power transmission belt according to claim 9, wherein the polyester cord is a ply-twisted cord obtained by combining a plurality of lower-twisted cords and subjecting them to upper-twisting. Manufacturing method. 12. The method for producing a polyester cord for reinforcing a power transmission belt according to claim 9, wherein the polyester fiber is previously provided with an epoxy compound at the stage of spinning.