JPH09209276A - Synthetic fiber for reinforcing rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a synthetic fiber for reinforcing rubber excellent in adhesiveness to rubber, to be concrete, adhesion to rubber in release between plies, maintaining essential characteristics of the synthetic fiber itself. SOLUTION: This synthetic fiber for reinforcing rubber is obtained by treating the surface of a synthetic fiber with a first treating solution containing a polyepoxide compound, a blocked isocyanate compound and/or an ethylene urea compound, a rubber latex and a silicate compound as main adhesive matrix components and then with a second treating solution containing a resorcinol/ formaldehyde precondensate, a rubber latex and a chlorophenol-based compound as main matrix components. The silicate compound contained in the first treating solution comprises silicon and magnesium as main constituent elements and the weight ratio of silicon/magnesium is 1/(0.1-1.0).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber-reinforcing synthetic fiber used as a reinforcing material for rubber products such as rubber hoses, belts and tires. More specifically, the original characteristics of the synthetic fiber itself are maintained. The present invention also relates to a rubber-reinforcing synthetic fiber which is excellent in adhesiveness with rubber, specifically, with rubber for peeling between plies.

[0002]

2. Description of the Related Art Fibers for reinforcing fiber-reinforced rubber structures such as tires, belts and hoses are mainly polyester fibers represented by polyethylene terephthalate fibers, polyamide fibers represented by nylon 6 fibers or nylon 66 fibers, and fragrances. Synthetic fibers such as group polyamide fibers and polyvinyl alcohol fibers are used, but since these synthetic fibers have poor adhesiveness to rubber, epoxy compounds, isocyanate compounds and halogenated phenol compounds are the main adhesive matrix components. A method for improving the adhesiveness of synthetic fibers to rubber by coating the surface of synthetic fibers with an adhesive treating agent has been proposed.

For example, as a typical adhesive treating agent for polyester fibers, halogenated phenols such as 2,6-bis (2 ', 4'-dihydroxyphenylmethyl) -4-chlorophenol and resorcin-formaldehyde are used. The reaction product was mixed with a mixed solution consisting of a resorcinol-formaldehyde initial condensate and a rubber latex, hereinafter referred to as RFL) (Japanese Patent Publication No. 46-11).
No. 251).

However, when this adhesive treatment agent is used, it is necessary to considerably increase the amount of the adhesive treatment agent attached to the polyester fibers and to perform heat treatment at a high temperature in order to obtain a sufficient adhesive force. By adopting severe treatment conditions, the initial adhesive force (pulling force) under normal temperature conditions is considerably increased, but on the contrary, there is a problem in that the amount of rubber peeling between fiber plies is small.

Further, as a method of applying the adhesive treatment agent to the polyester fiber in a two-step system, the polyester fiber is first treated with a first treatment liquid containing an epoxy compound / blocked isocyanate / bentonite mixture as an adhesive matrix component, Next, a method of treating with a second treatment liquid containing RFL and an ethylene urea compound as an adhesive matrix component (for example, JP-B-57-29586) is also known. In this method, heat-resistant adhesion of the polyester fiber obtained is obtained. The strength of the bentonite contained in the first treatment liquid is low, and the true specific gravity of the bentonite is high. In addition, the bentonite is not viscous and easily settles due to its large particle size. It was

Further, a first treatment liquid containing an epoxy compound / blocked isocyanate / rubber latex as an adhesive matrix component is first applied to polyester fibers, and then a second treating liquid containing RFL as an adhesive matrix component is applied.
A method of applying a treatment liquid (for example, Japanese Patent Publication No. 60-24226).
However, according to this method, the polyester fiber obtained by the treatment has a relatively high initial adhesive force, and the advantage that the rubber between the plies is increased, but the treated polyester fiber is treated. There is also a problem that the polyester fiber cord becomes hard and the strength of the cord is lowered, so that the molding process becomes difficult and the fatigue resistance is lowered.

On the other hand, as a typical example of the technique for improving the adhesion of a rubber to an aromatic polyamide fiber, for example, an aromatic polyamide fiber material, a polyepoxy compound having a hydroxyl group, and an epoxy compound containing an unsaturated bond are used as an adhesive matrix component. There is known a method (Japanese Patent Application Laid-Open No. 61-126142) of dipping in a first treatment liquid, heat treating, and then treating with a second treatment liquid containing RFL as an adhesive matrix component. There is a problem that the adhesive strength between the obtained aromatic polyamide fiber and rubber is still inferior to that of nylon fiber or polyester fiber.

The aromatic polyamide fiber is used as the adhesive matrix component of the polyepoxy compound / blocked isocyanate compound / rubber latex compound.
A method of treating with a treatment liquid and then a second treatment liquid containing RFL and a special chlorophenol compound as an adhesive matrix component (Japanese Patent Laid-Open No. 3-40875) is also known. Although the aromatic polyamide fiber to be used exhibits adhesive force with rubber which is close to nylon fiber or polyester fiber, it is necessary to considerably increase the adhesion amount of the adhesive composition in order to sufficiently satisfy the adhesive force. However, there is a problem that the cost of the adhesive composition increases.

[0009]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above.

Accordingly, an object of the present invention is to provide a synthetic fiber for rubber reinforcement which maintains the original properties of the synthetic fiber itself and is excellent in adhesiveness with rubber, specifically, with rubber for peeling between plies. Especially.

[0011]

In order to achieve the above object, the rubber-reinforcing fiber of the present invention comprises a synthetic fiber surface,
After treatment with a first treatment liquid containing a polyepoxide compound, a blocked isocyanate compound and / or an ethylene urea compound, a rubber latex and a silicate compound as a main adhesive matrix component, resorcin.
A rubber-reinforcing synthetic fiber treated with a second treatment liquid containing a formalin initial condensate, a rubber latex and a chlorophenol compound as main adhesive matrix components, the silicate compound being contained in the first treatment liquid. However, the main constituent elements are silicon and magnesium, and the weight ratio of silicon / magnesium is 1 / (0.1 to 1.
0).

Further, in the above silicate compound, the content of magnesium in the silicate compound is 5% by weight or more,
Further, the light transmittance T of the 1% aqueous dispersion is 70% or more, and the thixotropic index of the 2% aqueous dispersion is 2.0 to 10.0.
More specifically, smectite, particularly hydrophilic smectite, and a more desirable effect can be obtained when the blending amount of the first treatment liquid with respect to the adhesive matrix component is 1 to 15% by weight.

Further, the synthetic fiber is made of polyester, and the adhesion amount of the adhesive matrix component contained in the first treatment liquid is 1.
0 to 2.0% by weight, when the amount of the adhesive matrix component contained in the second treatment liquid is 0.5 to 4.0% by weight in terms of solid content based on the polyester fiber, and The fiber is made of aromatic polyamide, and the adhesion amount of the adhesive matrix component contained in the first treatment liquid is 1.0 to 3.0% by weight in terms of solid content with respect to the aromatic polyamide fiber. When the amount of the adhesive matrix component contained in the liquid is 0.5 to 5.0% by weight in terms of solid content with respect to the aromatic polyamide fiber, a further excellent effect can be obtained.

[0014]

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

The rubber-reinforcing synthetic fibers of the present invention include filament yarns, cords, woven fabrics and woven fabrics made of synthetic fibers such as polyester and aromatic polyamide as a raw material, and the above-mentioned first treatment liquid. And the surface is coated with the second treatment liquid.

When the rubber-reinforcing synthetic fiber of the present invention is used to reinforce a tire or belt, the twist coefficient is 1
It is a synthetic fiber in the form of a cord in which twists of 500 to 2300, in particular 1600 to 2000, are applied in opposite directions of the lower twist and the upper twist, and when the synthetic fiber for rubber reinforcement of the present invention is used for reinforcing a hose. Has 0 to 15
T / 10 cm twisted cord-shaped synthetic fiber
Each is preferably used.

As the above-mentioned polyester fibers, those made of a high molecular weight linear polyester having polyethylene terephthalate or ethylene terephthalate units as main repeating units are preferably used.

Further, as the above-mentioned aromatic polyamide fibers, poly-P-phenylene terephthalamide and poly-P are used.
-Phenylene.3-4'-diphenyl ether terephthalamide or a copolymer mainly composed of these is preferably used.

The silicate compound added to the adhesive matrix component of the first bath treatment liquid of the present invention is silicon,
It is an inorganic compound containing magnesium, sodium and lithium as constituent elements and further containing or not containing fluorine and / or aluminum as constituent elements, and is a synthetic inorganic compound generally called smectite.

In the above silicate compound, the content of magnesium in the silicate compound is 5% by weight or more, and the light transmittance T of the 1% aqueous dispersion is 50% or more, particularly 70% or more. is important.

The silicate compound has a thixotropy index of 2.0 to 10.0, particularly 3.0, in a 2% aqueous dispersion.
To 9.0, and the specific surface area is 100 to 5
00, particularly preferably in the range of 150 to 400.

The light transmittance T, thixotropy index and specific surface area referred to in the present invention are values obtained by the following method.

[Light Transmittance] A 1% aqueous dispersion of a silicate compound was thoroughly stirred and then allowed to stand for one day and night to collect only the aqueous dispersion which had not been separated by sedimentation. It is a value obtained by measuring the light transmittance at a wavelength of 500 nm by using a U-3000 type spectrophotometer (manufactured by Hitachi, Ltd.) in a cell.

[Thixotropic index] A 2% aqueous dispersion of a silicate compound was thoroughly stirred and then allowed to stand overnight for 1 day to collect an aqueous dispersion which had not been separated by sedimentation, and the viscosity thereof was measured by a B-type viscometer ( It was measured by the following formula. The rotor is No. 3 is used, and both 6 rpm and 60 rpm are allowed to stand for 2 minutes before measurement, and the values after 1 minute rotation are read. TI = (viscosity at 6 rpm) / (viscosity at 60 rpm)

[Specific surface area] Specific surface area A special cell of Qantaan Soap (manufactured by Yuasa Ionics Co., Ltd.) was weighed, and then about 1/2 (about 0.15 g) of a silicate compound was packed in this cell and weighed. The specific surface area was calculated by the following formula by measuring with a simple soap by the method. ◎ Specific surface area (m ² / g)
= (A / AC) × (V × 2.81 / sample amount g) A: Value of integrator after removing the cell from liquid nitrogen and immersing in water at room temperature AC: Integrator after injecting pure liquid nitrogen gas Value of V: A / 1300

The above-mentioned silicate compounds, especially synthetic smectites, become thixotropic dispersions when dispersed in water, have stable viscosity, and have a function of increasing the specific surface area.

Therefore, the silicate compound acts as a penetration inhibitor and a softening agent, and the adhesive composition containing the silicate compound is stable and excellent even if the adhesion amount to the synthetic fiber is reduced. In addition to exhibiting adhesiveness with rubber, it also makes the treated cord flexible and, at the same time, functions extremely effectively in preventing reduction in cord strength.

That is, since the silicate compound has many hydroxyl groups on the surface, it adsorbs water molecules in the adhesive composition and permeates into the inside of the fiber cord to form epoxy compounds, isocyanate compounds and rubber latex. Since the penetration of the adhesive matrix component into the inside of the fiber cord is suppressed, when the fiber cord is subjected to heat treatment in this state, the adhesive matrix component is solidified at the surface layer portion of the fiber cord, and the inner layer portion of the fiber cord is Mainly the silicate compound remains and the degree of freedom between the fiber single yarns in the inner layer of the cord is increased, so that the flexibility of the fiber cord is improved and the high strength of the fiber cord itself is maintained.

Further, the incorporation of the silicate compound suppresses the aggregation of the adhesive matrix components such as rubber latex in the adhesive composition, and the respective adhesive matrix components are uniformly mixed and stabilized to form an adhesive matrix. Since it adheres evenly to the fiber surface based on its excellent cohesive force, it is possible to obtain excellent adhesiveness with rubber even with a small adhesion amount.

The first treatment liquid of the present invention is an adhesive composition in which the adhesive matrix component is composed mainly of a polyepoxide compound, a blocked polyisocyanate compound and / or an ethyleneurea compound and a rubber latex, which is synthesized. After being applied to the fiber cord, it is necessary to further apply a second treatment liquid for forming an adhesive matrix of resorcin-formalin precondensate, rubber latex and chlorophenol compound.

The polyepoxide compound used in the first bath treatment liquid of the present invention is a compound containing two or more epoxy groups in one molecule, specifically, glycerol, pentaerythritol, sorbitol, ethylene glycol. Reaction products of polyhydric alcohols such as polyethylene glycol and propylene glycol with halogen-containing epoxides such as epichlorohydrin, resorcin, bis (4-hydroxyphenyl) dimethylmethane,
Phenol-formaldehyde resin and resorcin
Reaction products of polyhydric phenols such as formaldehyde resin with the halogen-containing epoxides, bis-
Polyepoxide compounds obtained by oxidizing unsaturated bond moieties such as (3,4-epoxy-6-methyl-dicyclohexylmethyl) adipate and 3,4-epoxycyclohexene epoxide, bisphenol A type epoxy compounds and bisphenol A type urethanes Examples thereof include modified epoxy compounds, and these may be used alone or in admixture of two or more.

Among them, a preferable polyepoxide compound is a reaction product of polyhydric alcohols and epichlorohydrin (polyglycidyl ether compound of polyhydric alcohol).
It is.

Similarly, the blocked polyisocyanate compound used in the first treatment liquid is a compound which liberates a blocking agent by heat to produce an active isocyanate compound, and specifically, tolylene diisocyanate and metaphenylene diisocyanate. Polyisocyanate compounds such as diphenylmethane diisocyanate, hexamethylene diisocyanate and triphenylmethane triisocyanate, and phenols such as phenol, cresol and resorcin, lactams such as ε-caprolactam and valerolactam, acetoxime, methyl ethyl ketone oxime and cyclohexane oxime. Examples thereof include reaction products with a blocking agent selected from oximes and ethyleneimine.

Among these blocked polyisocyanate compounds, good results are obtained especially when aromatic polyisocyanate compounds blocked with ε-caprolactam and aromatic compounds of diphenylmethane diisocyanate are used.

Similarly, the ethyleneurea compound in the first treatment liquid is a compound which reacts by opening the ethyleneimine ring by heating to improve the adhesiveness, and specific examples thereof include hexamethylene diisocyanate and tolylene diisocyanate. Aromatics such as diphenylmethane diisocyanate and triphenylmethane diisocyanate,
Examples thereof include reaction products of aliphatic isocyanate and ethyleneimine.

Of these ethylene urea compounds, the use of aromatic ethylene urea compounds of diphenylmethanediethylene urea gives good results.

The first treatment liquid may contain one or both of the blocked polyisocyanate compound and the ethylene urea compound.

Similarly, as the rubber latex contained in the first treatment liquid as needed, the rubber latex may be selected in accordance with the adhered rubber.
Vinyl pyridine-styrene-butadiene copolymer latex (VP latex), styrene-butadiene rubber latex (SBR latex), acrylonitrile-
Butadiene-based rubber latex (NBR latex), chloroprene-based rubber latex (CR latex), chlorosulfonated polyethylene latex (CSM latex), acrylate-based rubber latex and natural rubber latex (NR latex), or ethylenically unsaturated in these latexes A latex obtained by copolymerizing an acid or the like is appropriately used alone or as a mixture. The compounding ratio of the polyepoxide compound, the blocked polyisocyanate compound and / or the ethylene urea compound, and the rubber latex in the first treatment liquid is 10 to 25% by weight and 20 to 3
5% by weight-0-70% by weight, especially 10-20% by weight-
A ratio of 20 to 30% by weight and 0 to 70% by weight is preferable.

Here, if the blending amount of the polyepoxide compound and the blocked polyisocyanate compound and / or the ethylene urea compound is less than the above-mentioned ratio, the initial adhesive strength of the treated synthetic fiber tends to decrease. Not preferable.

The first treatment liquid is preferably used as a solution (including a dispersion liquid) having a total solid content of the adhesive matrix component of 2 to 10%, particularly 4 to 7%. Especially, it is preferably applied to polyester fibers and aromatic polyamide fibers.

The silicate compound is blended in the first treatment liquid, and the blending amount is 1 to 15% by weight with respect to the adhesive matrix component contained in the treatment liquid.
A range of 10% by weight is especially preferred.

When the content of the silicate compound is 1.0% by weight or less with respect to the adhesive matrix component of the first treatment liquid, the strength of the treated fiber cord cannot be sufficiently suppressed from decreasing. If it is 0.0% by weight or more, the adhesive strength of the treated fiber cord to rubber tends to decrease, which is not preferable.

As the second treatment liquid to be applied to the synthetic fibers after the first treatment liquid, a treatment liquid containing resorcin / formalin initial condensate, rubber latex and chlorophenol compound as an adhesive matrix component is used.

The resorcin-formalin initial condensate used in the second treatment liquid of the present invention is one in which resorcin and formaldehyde are condensed under an alkali catalyst.

Similarly, as the rubber latex, vinylpyridine-styrene-butadiene copolymer latex, styrene-butadiene rubber latex, acrylonitrile-butadiene rubber latex, chloroprene rubber are used in the same manner as those used in the first treatment liquid. A rubber latex, a chlorosulfonated polyethylene latex, an acrylate rubber latex, a natural rubber latex, or a rubber latex obtained by copolymerizing these latexes with an ethylenically unsaturated acid is appropriately used alone or in a mixture. In this case, the same treatment liquid as the first treatment liquid or a different treatment liquid may be used.

Similarly, as the chlorophenol compound,
2-6 bis (2,4-dihydroxyphenylmethyl) -4-chlorophenol such as "Valka Bond" E (manufactured by Varnax), "Denabond", "Denabond" A or "Denabond" K (manufactured by Nagase Kasei) Is used.

The second treatment liquid has a total solid content of the adhesive matrix component of 5 to 20%, particularly 7 to 15
% Solution (including dispersion) is preferred. In the present invention, the rubber reinforcing fiber is manufactured by the following procedure.

First, the first treatment liquid is dipped in a fiber cord and dried at a temperature of 70 to 150 ° C., and then 200 to 25.
Heat treatment is performed at a temperature of 5 ° C.

Subsequently, the second treatment liquid is applied and the first treatment liquid is added.
After drying at 70 to 150 ° C. as in the case of the treatment liquid,
Heat treatment is performed at 200 to 255 ° C.

After the treatment liquid is applied and dried at 70 ° C. or less, the resorcinol / formaldehyde / rubber latex adheres to the roller without solidifying to reduce the amount of adhering to the braid and to cause uneven adhesion and adhesion to rubber. Becomes worse.

When the heat treatment temperature is higher than 250 ° C., the resorcinol / formaldehyde / rubber latex is deteriorated and the adhesiveness with the rubber is lowered, while when the heat treatment temperature is less than 200 ° C., the adhesiveness with the rubber is deteriorated. Will tend to decrease.

The adhesion amount of the adhesive matrix component of the first treatment liquid to the synthetic fiber cord is 1.0 to 2.0% by weight in the case of polyester fiber, especially 1.
The range of 2 to 1.7% by weight, the range of 1.0 to 3.0% by weight in the case of aromatic polyamide fibers, and the range of 1.2 to 2.0% by weight are particularly preferable.

The amount of the adhesive matrix component attached to the second treatment liquid is in the range of 0.5 to 4.0% by weight, particularly 1.0 to 3.0% by weight, in the case of polyester fiber, in terms of solid content. However, in the case of aromatic polyamide fiber, it is 0.5 to 5.0.
%, Especially 1.0 to 4.0% by weight, respectively.

The rubber reinforced by the rubber-reinforcing synthetic fiber of the present invention includes natural rubber (NR), styrene-butadiene rubber (SBR), isoprene rubber (IR), butyl rubber (IIR), halogenated butyl rubber ( X-II
R), chloroprene rubber (CR), ethylene propylene rubber (EPDM), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), chlorosulfonated polyethylene rubber (CSM), acrylic rubber (ACM), hydrin rubber (CHC) or A mixture of these various rubbers may be used, and any rubber type may be used.

The rubber-reinforcing synthetic fiber of the present invention has a cord hardness of 5 to 20 g per fiber and exhibits excellent adhesiveness with a peeling force of 15 to 20 kg / inch in a rubber peeling test.

Therefore, the rubber-reinforcing synthetic fiber of the present invention maintains the original excellent properties of the synthetic fiber, has an excellent adhesive force (peeling force) with rubber, and is high in flexibility and fatigue resistance. It can form high-quality cords and is useful as a reinforcing material for rubber products such as tires, belts and hoses.

[0057]

EXAMPLES Next, the present invention will be specifically described with reference to examples.

Each performance measurement value in the following examples is obtained by the following method.

(1) Cord strength Using JIS Tensileon, JIS L-1017 (198)
It measured according to 3). (2) Adhesiveness A test piece having a width of 25 mm was prepared using the adhered rubber and the treated cord, and the treated cord / rubber peeling force was measured according to the peeling test method described in JIS K-6328 (1995). It was measured. The vulcanization was performed at 150 ° C. for 30 minutes using a vulcanizing press.

(3) Cord hardness The treated cord was straightened and cut into 2 cm, and the bridge (1 cm interval, φ:
(0.6mm), hook the bar perpendicular to the cord (φ: 0.6mm) and hang it down the cord center (2cm)
/ Min), the maximum stress was calculated and the value was defined as the cord hardness.

(5) Adhesion amount of resin According to JIS L-1017 (1983), both polyester fiber and aromatic polyamide fiber were determined by a mass method.

[Examples 1 to 12] Polyepoxide compound / blocked isocyanate compound / vinyl pyridine-
100 parts by weight of a mixed liquid obtained by mixing styrene-butadiene copolymer latex / butadiene latex at a ratio of 11.0% by weight / 23.0% by weight / 33.0% by weight / 33.0% by weight in solid content. On the other hand, the aqueous solution (% by weight) of the silicate compound A or B described in Table 1 was added at the ratios shown in Table 2, respectively, and the solid content of each mixed solution was 6% by weight.
The first treatment liquid was prepared by adjusting the above.

[0063]

[Table 1]

Under an alkaline catalyst, 1.5 mol of formalin was added to 1 mol of resorcin at 2% at a solid content of 10%.
The initial condensate obtained by aging for a time is vinylpyridine-
Latex 1 comprising 50 parts by weight of styrene-butadiene copolymer latex and 50 parts by weight of butadiene latex
12.5 parts by weight was added to 00 parts by weight to make the solid content concentration 30% by weight (RFL), and the mixture was aged at 25 ° C. for 24 hours.

Then, 25 parts by weight of "Valka Bond" E (manufactured by Akzo Nobel) was added to 100 parts by weight of the RFL so that the solid content concentration was 20%, and the mixture was aged at 25 ° C. for 24 hours to give a second mixture. It was used as a treatment liquid.

On the other hand, polyethylene terephthalate having a yarn viscosity of 0.95 was melt-spun at high speed and stretched to obtain 15
00 denier multifilament 8 times / 10 cm
The raw cord was obtained by twisting with the number of twists of.

Aromatic polyamide raw yarn "Kevlar" having a fineness of 1500 denier (made by Toray DuPont)
Was twisted 8 times / 10 cm and the raw cord was obtained.

Then, using a computer treating machine (manufactured by Ritzler), the first treatment liquid having the composition shown in Table 2 was applied to the above-mentioned raw cord, and the liquid was drained by an air wiper at 120 ° C. Dry for 100 seconds, then 2
Heat treatment was performed at 40 ° C. for 60 seconds. Next, the second treatment liquid was applied, dried at 120 ° C. for 100 seconds, and subsequently heat-treated at 240 ° C. for 60 seconds.

The amount of the treatment liquid deposited on each of the cords thus obtained, the hardness of the cord, and the adhesiveness (peeling force) with EPDM rubber or CR rubber were measured, and the results are also shown in Table 2.

[0070]

[Table 2]

[Examples 13 to 24] The latex of the first treatment liquid and the second treatment liquid was changed to those shown in Table 3, and after the second treatment liquid was applied, it was dried at 120 ° C for 100 seconds,
Drain with an air wiper, then 60 at 220 ℃
A treatment code was obtained by the same operation as in Examples 1 to 12 except that the heat treatment was performed for 2 seconds.

The amount of the treatment liquid deposited on each of the obtained cords, the hardness of the cords, and the adhesiveness (peeling force) to the NBR rubber or the H-NBR rubber were measured, and the results are also shown in Table 3.

[0073]

[Table 3]

[Examples 25 to 42] A treatment code was obtained in the same manner as in Examples 1 to 6 except that the rubber latexes of the first treatment liquid and the second treatment liquid were changed to those shown in Tables 4 to 5. Obtained.

The amount of the treatment liquid deposited on each of the obtained cords, the hardness of the cords, and the adhesiveness to the rubber shown in Tables 4 to 5 (peeling force)
Was measured and the results are also shown in Tables 4 to 5.

[0076]

[Table 4]

[0077]

[Table 5]

[Comparative Examples 1 to 42] Table 1 shows silicate compounds.
When the first treatment liquid changed to No. C (bentonite) shown in (Comparative Examples 1, 7, 4, 10, 13, 19,
16, 22, 25, 31, 28, 34, 37, 40),
When the first treatment liquid containing no silicate is used (Comparative Examples 2, 8, 5, 11, 14, 20, 17, 23, 26, 3
2, 29, 35, 38, 41), in the case where Barca Bond E is not added to the second treatment liquid (Comparative Examples 3, 9, 6, 12, 1).
5,21,18,24,27,33,30,36,3
For 9, 42), a treatment code was obtained by the same operation as in Example 1 or 4.

The amount of the treatment liquid deposited on each of the obtained cords, the hardness of the cords, and the adhesiveness to the rubber shown in Tables 6 to 9 (peeling force)
Was measured, and the results are also shown in Tables 6 to 9.

[0080]

[Table 6]

[0081]

[Table 7]

[0082]

[Table 8]

[0083]

[Table 9]

[0084]

As described above, the rubber-reinforcing synthetic fiber of the present invention maintains the original excellent characteristics of the synthetic fiber,
In addition, it has excellent adhesive force (peeling force) with rubber, and can form a high-quality cord that is flexible and has excellent fatigue resistance, and is useful as a reinforcing material for rubber products such as tires, belts and hoses.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location D06M 15/00

Claims (10)

[Claims] 1. After treating the surface of the synthetic fiber with a first treatment liquid containing a polyepoxide compound, a blocked isocyanate compound and / or an ethylene urea compound, a rubber latex and a silicate compound as a main adhesive matrix component, A rubber-reinforcing synthetic fiber treated with a second treatment liquid containing a resorcin-formalin initial condensate, a rubber latex and a chlorophenol compound as a main adhesive matrix component, which comprises:
The silicate compound contained in the treatment liquid contains silicon and magnesium as main constituent elements, and the silicon / magnesium weight ratio is 1 / (0.1 to 1.0), for rubber reinforcement. Synthetic fibers. 2. The synthetic fiber for rubber reinforcement according to claim 1, wherein the content of magnesium in the silicate compound is 5% by weight or more. 3. A 1% aqueous dispersion of a silicate compound contained in the first treatment liquid has a light transmittance T of 50% or more, and a 2% aqueous dispersion of a silicate compound has a thixotropic index of 2.
It is 0-10.0, The claim 1 or 2 characterized by the above-mentioned.
The synthetic fiber for rubber reinforcement according to. 4. The silicate compound contained in the first treatment liquid further contains at least one selected from sodium, lithium and fluorine. The synthetic fiber for rubber reinforcement according to. 5. The silicate compound contained in the first treatment liquid is smectite.
The synthetic fiber for rubber reinforcement according to any one of 1. 6. The silicate compound according to claim 1, wherein the compounding amount of the silicate compound is 1 to 15% by weight with respect to the adhesive matrix component of the first treatment liquid. Synthetic fiber for rubber reinforcement. 7. The synthetic fiber for rubber reinforcement according to claim 1, wherein the synthetic fiber is made of polyester. 8. The adhesion amount of the adhesive matrix component contained in the first treatment liquid is 1.0 to 2.0% by weight in terms of solid content based on the polyester fiber, and the adhesive matrix component is contained in the second treatment liquid. The synthetic fiber for rubber reinforcement according to claim 7, wherein the adhesion amount of the adhesive matrix component is 0.5 to 4.0% by weight in terms of solid content based on the polyester fiber. 9. The synthetic fiber for rubber reinforcement according to claim 1, wherein the synthetic fiber is made of aromatic polyamide. 10. The adhesion amount of the adhesive matrix component contained in the first treatment liquid is 1.0 to 3.0% by weight in terms of solid content with respect to the aromatic polyamide fiber, and the adhesive matrix component is contained in the second treatment liquid. The synthetic fiber for rubber reinforcement according to claim 9, wherein the adhered amount of the adhesive matrix component is 0.5 to 5.0% by weight in terms of solid content with respect to the aromatic polyamide fiber.