JPH08120573A - Glass fiber for reinforcement of hydrogenated nitrile rubber - Google Patents

Abstract

PURPOSE: To produce a glass fiber for the reinforcement of a hydrogenated nitrile rubber, free from the defects of conventional technology, dispensing with the treatment with an over-coating liquid, resistant to the lowering of bonding power with the lapse of time even by using under repeated flexural stress at a high temperature, producible at a low cost and having high heat- resistance. CONSTITUTION: This glass fiber for the reinforcement of a hydrogenated nitrile rubber is produced by coating glass fiber with a treating agent containing (A) a highly saturated polymeric rubber latex containing nitrile group and having an iodine value of <=120, (B) a rubber latex other than the highly saturated polymeric rubber latex, (C) an acrylic acid salt or a methacrylic acid salt and (D) a water-soluble condensate of resorcinol and formaldehyde at weight ratios of 15-95wt.%, 0-70wt.%, 0.01-5wt.% and 2-15wt.% in terms of solid, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber-reinforcing glass fiber having excellent heat resistance, flexibility and water resistance used for reinforcing rubber products such as rubber belts and tires.

[0002]

2. Description of the Related Art Reinforcing fibers such as glass fibers are widely used as a reinforcing material for rubber products such as rubber belts and tires.
Since a rubber product such as a rubber belt is repeatedly subjected to bending stress, bending fatigue is caused to deteriorate the performance, peeling occurs between the reinforcing material and the rubber matrix, and the reinforcing fiber is worn, so that the strength is apt to decrease. Such a phenomenon tends to be particularly accelerated by heat and moisture. In order to prevent such peeling due to bending fatigue and obtain a sufficient reinforcing effect, it is necessary to increase the familiarity between the reinforcing fiber and the rubber, increase the adhesive force, and have heat resistance and water resistance. Various treatment agents are applied to the fiber surface.

Various types of treating agents have been proposed. For example, JP-A-1-221433 discloses a treatment agent in which a resorcin-formaldehyde water-soluble condensate, a vinylpyridine-butadiene-styrene terpolymer latex, a dicarboxylated butadiene-styrene copolymer latex and a chlorosulfonated polyethylene latex are used in combination. Is proposed.

Further, for example, JP-A-63-270877 proposes a composition mainly composed of a resorcin-formaldehyde water-soluble condensate and a nitrile group-containing highly saturated polymer rubber having an iodine value of 120 or less.

Further, for example, in JP-A-63-16975, vinyl pyridine-styrene-butadiene terpolymer latex, rubber latex, and resorcin-
There has been proposed a method of treating with a first liquid containing a water-soluble condensate of formaldehyde and then treating with a second liquid containing a halogen-containing polymer and an isocyanate.

[0006]

With such conventional treating agents and treating methods, the adhesiveness at high temperatures cannot be said to be sufficient, and therefore it is difficult to obtain a rubber product having sufficient bending strength.
In recent years, as the temperature in the automobile engine room has risen, it has become common to use hydrogenated nitrile rubber with high heat resistance as a rubber for timing belts. Generally, rubber with high heat resistance has adhesive properties. As the above-mentioned drawbacks are low, the above-mentioned drawbacks tend to be larger than rubbers having low heat resistance, such as chloroprene rubber which has been conventionally used, and can withstand long-distance running in spite of improved heat resistance of rubber. Timing belts made of hydrogenated nitrile rubber have not been obtained.

By treating the rubber-reinforcing fiber with the RFL solution and then with the overcoat solution containing rubber and isocyanate, the above problems can be solved to some extent. However, this method has the following problems. Have a point. (1) Since the heat resistance of the overcoating agent is insufficient, the adhesive force decreases with the passage of time. (2) Since the treatment is performed with the RFL liquid and then with the overcoat liquid, the manufacturing process becomes long and the cost is high.

The present invention eliminates the above-mentioned drawbacks of the prior art without treating with an overcoat liquid, and even if it is used under conditions in which bending stress is repeatedly applied at high temperature, Without the adhesive strength decreasing with the passage of time,
It is an object to provide a glass fiber for reinforcing hydrogenated nitrile rubber, which is inexpensive and has high heat resistance.

[0009]

Means for Solving the Problems The present invention has an iodine value of 1
Nitrogen group-containing highly saturated polymer rubber latex (A) having 20 or less, rubber latex (B) excluding the highly saturated polymer rubber latex, acrylate or methacrylate (C) and resorcin-formaldehyde water-soluble condensate 15 to 95% by weight of (D) in terms of solid content weight ratio,
A glass fiber for reinforcing hydrogenated nitrile rubber, which is coated with a treating agent containing 0 to 70% by weight, 0.01 to 5% by weight, and 2 to 15% by weight.

Next, the present invention will be described more specifically. As the nitrile group-containing highly saturated polymer rubber latex (A) used in the present invention, an iodine value of 120 or less is necessary from the viewpoint of the film strength of the rubber and the adhesive strength to the matrix rubber, and a preferable iodine value Is 0 to 100, and a more preferable iodine value is 0 to 50. As this latex, Zet Pole Latex 2020 (Iodine number 28, trade name, manufactured by Zeon Corporation)
Can be preferably used. The iodine value is JIS K00.
It is a value obtained according to 70.

The nitrile group-containing highly saturated polymer rubber latex (A) is specifically a hydrogenated product of butadiene-acrylonitrile copolymer rubber, isoprene-butadiene-acrylonitrile copolymer rubber, isoprene-acrylonitrile copolymer rubber and the like: Butadiene-methyl acrylate-acrylonitrile copolymer rubber, butadiene-acrylic acid-acrylonitrile copolymer rubber, etc. and hydrogenated products thereof: butadiene-ethylene-acrylonitrile copolymer rubber, butyl acrylate-ethoxyethyl acrylate-vinyl chloroacetate-acrylonitrile copolymer Polymerized rubber, butyl acrylate-ethoxyethyl acrylate-vinyl norbornene-acrylonitrile copolymer rubber, etc. can be exemplified, and a usual polymerization method and a usual hydrogenation method are used. It can be obtained by.

The rubber latex (B) other than the highly saturated polymer rubber latex is not essential, but when the flexibility of the belt is particularly required, it is preferably contained in an amount of 70% by weight or less. As the rubber latex (B), butadiene-styrene copolymer latex, dicarboxylated butadiene-styrene copolymer latex, vinylpyridine-butadiene-styrene terpolymer latex, isoprene rubber latex, chloroprene latex, chlorosulfonated polyethylene latex, And an acrylonitrile-butadiene copolymer latex having an iodine value of more than 120 can be preferably used. Among them, particularly preferable results can be obtained when a mixture of vinylpyridine-butadiene-styrene terpolymer latex and chlorosulfonated polyethylene latex (mixing ratio (weight) 3: 7 to 7: 3) is used. As a butadiene-styrene copolymer latex, J9040
(Product name, Sumitomo No-Gatac Co., Ltd.), Nipol LX
110 (trade name, manufactured by Zeon Corporation) and the like can be preferably used.

As the dicarboxylated butadiene-styrene copolymer latex, those containing 20 to 80% by weight of butadiene, 5 to 70% by weight of styrene and 1 to 10% by weight of ethylenically unsaturated dicarboxylic acid are particularly suitable. , Nipol 2570X5 (trade name, manufactured by Nippon Zeon Co., Ltd.), JSR 0668 (trade name, manufactured by Japan Synthetic Rubber Co., Ltd.) and the like can be preferably used.

As the vinyl pyridine-butadiene-styrene terpolymer latex, a number of such terpolymers well known to those skilled in the art can be used. For example, those having a polymerization ratio of vinyl pyridine, butadiene and styrene of 10 to 20:60 to 80:10 to 20 are particularly suitable, and Nipol 2518FS (trade name,
Pyratex (trade name, manufactured by Sumitomo Nogatak Co., Ltd.) and the like can be preferably used.

As the isoprene rubber latex, Maxprene IR-900 (trade name, manufactured by Sumitomo Seika) and the like can be preferably used. As chloroprene latex,
Neoprene 650 (trade name, manufactured by Showa Neoprene Co., Ltd.) and the like are preferably used.

The chlorosulfonated polyethylene latex has a chlorine content of 25 to 43% by weight and a sulfur content of 1.
0 to 1.5% by weight is particularly suitable, Espre
Ne (trade name, manufactured by Sumitomo Chemical Co., Ltd.) and the like can be preferably used.

As the acrylonitrile-butadiene copolymer latex, the amount of bound acrylonitrile is 36 to 43.
% (Iodine value: 200 to 300) is particularly suitable, and Nipol1561 (trade name, manufactured by Zeon Corporation) and the like can be preferably used.

Examples of the acrylate or methacrylic acid salt (C) used in the present invention include zinc acrylate, zinc methacrylate, lead acrylate, lead methacrylate, aluminum acrylate and aluminum methacrylate. (Meth) acrylic acid metal salts can be used, and among them, zinc acrylate and zinc meacrylate can be preferably used.

As the resorcin-formaldehyde water-soluble condensate (D) (hereinafter referred to as RF) used in the present invention, resorcin and formaldehyde are alkali hydroxides,
A resol-type water-soluble addition condensate obtained by reacting in the presence of an alkaline catalyst such as an amine can be preferably used. In particular, it is desirable that the reaction molar ratio of resorcin (R) and formaldehyde (F) is R / F = 1: 0.5 to 3.

In the present invention, a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less,
The rubber latex (B) other than the highly saturated polymer rubber latex, the acrylic acid salt or methacrylic acid salt (C), and the resorcin-formaldehyde (RF) water-soluble condensate (D) are mixed in such a proportion that the solid content is by weight. The ratio of 15 to 95% by weight, 0 to 70% by weight, 0.01 to 5% by weight and 2 to 15% by weight, respectively, is used as a treating agent by uniformly mixing these three or four types of substances. More preferable blending ratios are 30 to 70% by weight, 20 to 60% by weight, 0.03 to 3% by weight and 3 to 12% by weight, respectively.

The proportion of the nitrile group-containing highly saturated polymer rubber latex (A) in the treating agent is less than 15% by weight or 80%.
When it exceeds the weight%, heat resistance, water resistance and flex resistance are not improved. If the proportion of the RF water-soluble condensate (D) exceeds 15% by weight, the coating film of the treatment agent of the present invention becomes hard and sufficient flex fatigue resistance cannot be obtained. If this ratio is less than 2% by weight, sufficient adhesion with the rubber matrix cannot be obtained. If the amount of rubber latex (B) exceeds 70% by weight,
Sufficient heat resistance and bending resistance cannot be obtained. If this ratio is too small, the water resistance is not sufficiently improved, so the content is preferably 2% by weight or more, and more preferably more than 5% by weight. The amount of acrylate or methacrylate (however, the total amount when acrylate and methacrylate are used together and when plural kinds of (meth) acrylates are used together) is less than 0.01% by weight. And the co-crosslinking bond with the matrix rubber becomes insufficient, and it becomes difficult to obtain the heat and bending fatigue resistance which is the effect of the present invention. Further, even if this amount exceeds 5% by weight, the effect is expected to increase to a great extent. No
Not economical. A more preferable range of the amount of acrylate or methacrylate (C) is 0.1 to 3% by weight.

The solid concentration of the treating agent in the present invention is 10
It is suitable to be -40% by weight, preferably 20-35% by weight. If the concentration is too low, the adhesion to the reinforcing fiber will be insufficient, and if the concentration is too high, it will be difficult to control the amount of adhesion to the reinforcing fiber, and it will be difficult to obtain a uniform amount of the reinforcing fiber.

In the present invention, the treating agent contains the above-mentioned nitrile group-containing highly saturated polymer rubber latex (A), rubber latex (B), acrylate or methacrylate (C) and RF as essential components. But if necessary, p
In order to adjust H, a base, for example, ammonia can be contained, and further, a stabilizer, an antiaging agent and the like can be contained.

In the present invention, the glass composition of the glass fiber to which the treating agent of the present invention is applied is not limited,
E-glass, high strength glass, etc. are illustrated. Further, the filament diameter of the glass fiber is not particularly limited, but those having a diameter of 5 to 13 μm are generally used.

In the present invention, glass fibers, particularly strand-shaped glass fibers, are immersed in the above treatment agent to remove excess treatment agent, and then dried if necessary to coat the surface of the glass fiber strands with the treatment agent. To be done. At that time, the glass fiber strand may or may not be provided with a sizing agent which is applied when the glass fiber is spun. The desired number of glass fiber strands coated with the treating agent are then collected and usually twisted to obtain a glass fiber cord. Then, the glass fiber cord is embedded in an unvulcanized rubber base material by a method known per se, and heat-vulcanized under pressure.

In the present invention, the treating agent is applied to the glass fiber cord in a solid content of usually 10 to 30% by weight. The glass fiber cord of the present invention can also be used to reinforce chloroprene rubber, acrylonitrile butadiene rubber, chlorosulfonated polyethylene rubber, etc., but it is possible to obtain extremely suitable results especially for hydrogenated nitrile rubber. I can.

The hydrogenated nitrile rubber product produced by using the glass fiber of the present invention as a reinforcing material is excellent in heat resistance bending fatigue resistance and water resistance. Therefore, the glass fiber of the present invention can be very suitably used as a reinforcing fiber of, for example, an automobile timing belt, which is subjected to bending stress in an environment affected by heat and moisture.

[0028]

The present invention will be described in more detail with reference to the following examples. Example 1 (1) A non-alkali glass filament having a diameter of 9 μm was spun, and this was bundled with a sizing agent to obtain a glass strand of 33.7 tex, and three strands of this were combined to form the following composition: --- 30 parts by weight of water-soluble condensate of resorcinol-formaldehyde (R / F = 1/1. 5 Solid content 8% by weight) Vinyl pyridine-butadiene-styrene terpolymer 30 parts by weight Latex (Nipol2518FS solid content 40% by weight) Highly saturated polymer rubber latex containing nitrile group 35 parts by weight (Zetpol latex 2020, butadiene-AC) Hydrogenated lyronitrile copolymer rubber, iodine value 28, solid content 40% by weight) Zinc methacrylate 0.6 parts by weight 25% ammonia water 1 part by weight water 4 parts by weight of a treatment agent consisting of ------------------------------------- is attached to the glass fiber. The amount (solid content) is 20% by weight, and then 280 ° C
And heat treated for 2 minutes.

Next, this glass fiber bundle was used for 2.
2.1 times per inch is obtained by applying a single twist in the Z direction (S direction) and then combining 11 of the fiber bundles to which this undertwist is applied.
ECG150 after twisting the S direction (Z direction)
A glass fiber cord of 3/11 2.1S (Z) was obtained.

Here, ECG150 3/11 2.1S
Explaining (Z), E is an alkali-free glass (E
Glass), C is long fiber, G is filament diameter is about 9μ
m means that each strand is 150
Must be 5,000 yards / pound, 3 of the numerator of 3/11 is the number of strands to be plied, and 1 of the denominator of 3/11
1 represents the number of yarn bundles which are twisted downward and are twisted. 2.1S (Z) is a fiber bundle with a twist
This means that one plied yarn is twisted and twisted 2.1 times per inch in the S direction (Z direction).

The treated cord thus obtained was placed on a rubber compound sheet shown in Table 1 to have a length of 12 cm and a width of 2 cm.
The rubber compound (a) was pressed at a pressure of 5 MPa, the pressure was 5 MPa at 150 ° C. for 30 minutes, and the rubber compounds (b) and (c) were pressed at a pressure of 5 MPa, 16 mm.
The adhesive strength test piece was obtained by vulcanizing at 0 ° C. for 30 minutes.

A peeling test was performed on the obtained test piece to measure the initial adhesive force. Test piece obtained in the same manner
The adhesive strength (heat resistant adhesive strength) after heat treatment in an air oven at 20 ° C. for 168 hours was measured by a peel test. In addition, the adhesive strength (water resistant adhesive strength) after boiling the test piece obtained in the same manner for 1 hour in water was measured. The results are shown in Table 2.
Shown in

Further, using the glass fiber cord obtained in the same manner as the reinforcing fiber and using the rubber having the composition shown in Table 1, a toothed belt having a width of 19 mm and a length of 980 mm was prepared. This toothed belt was mounted on a running tester equipped with a drive motor of 6000 rpm, and a heat resistant running test was carried out for 400 hours in an environment of 120 ° C. Measure the tensile strength of the belt after this test,
The ratio to the tensile strength before the test, that is, the tensile strength retention rate was obtained. Further, a toothed belt obtained in the same manner as above was used to obtain 6000.
Attached to the water injection running test equipped with a rpm drive motor,
A water running test was conducted for 24 hours at room temperature. Then, similarly, the tensile strength retention rate was obtained. The results are shown in Table 2.

[0034]

[Table 1] Rubber compounding --------------------------------------------- Part) C (Part) −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Z-pole 2020 (* 1) 100 Z-pole 2000 (* 2) 100 ZSC2295N (* 3) 100 Zinc Hua No. 1 5 2 5 Stearic acid 1 1 1 SRF carbon 60 60 30 Trioctyl trimellitate 10 10 5 Magnesium oxide-2-4,4- (α, α) -Dimethylben 1.5 1.5 1.5 dil) diphenylamine 2-mercaptobenzimidazo 1.5 1.5 1.5 zinc salt sulfur 0.5-tetramethylthiuram sulfide 1.5-cyclohexyl- Benzothiazyl 1 --- Sulfenamide Vul- up40KE (* 4) -8 6 triaryl isocyanurate-2- (1)-(2)-(-)-(-)-(-)-(-)-(-)-(-) * 1) Nippon Zeon's product: Nitrile group-containing highly saturated copolymer rubber iodine value 28, bound acrylonitrile amount 36% (* 2) Nippon Zeon's product: Nitrile group-containing highly saturated copolymer rubber iodine value 4, bound acrylonitrile Amount 36% (* 3) Nippon Zeon Co., Ltd. product: Zinc polymethacrylate dispersed nitrile group-containing highly saturated copolymer rubber (* 4) Hercules product: 40% 1,3-bis (t-butylperoxy-) Isopropyl) benzene

Example 2 Instead of the composition used in Example 1, ----------------------------------------------- --Resorcin-formaldehyde water-soluble condensate 30 parts by weight (R / F = 1 / 1.5 solid content 8% by weight) Vinyl pyridine-butadiene-styrene terpolymer 30 parts by weight Latex (Nipol2518FS solid content 40% by weight) Nitrile group-containing highly saturated polymer rubber latex 15 parts by weight (Zetpol latex 2020 iodine value 28 solid content 40% by weight) Chlorosulfonated polyethylene latex 20 parts by weight (Esprene 200 solid content 40% by weight) Zinc methacrylate 0 .4 parts by weight 25% ammonia water 1 part by weight water 4 parts by weight -----------------------. Table 2 shows the results of the same test as in Example 1 using the treating agent consisting of ---.

Comparative Example 1 The same test as in Example 1 was carried out using a treating agent having the same composition as in Example 1 except that zinc methacrylate was not used. Table 2 shows the results. Comparative Example 2 The same test as in Example 2 was conducted using a treating agent having the same composition as in Example 2 except that zinc methacrylate was not used. Table 2 shows the results. Comparative Example 3 The glass fiber cord obtained in Comparative Example 1 was coated with a secondary coating treatment liquid having the following composition so that the amount of non-volatile components deposited was 2.5 to 3.5% by weight, and dried to perform secondary coating. A glass fiber cord with layers was obtained. Chlorosulfonated polyethylene TS-340 5.25 parts by weight (manufactured by TOSO) Methylenebis (4-phenylisocyanate) 4.50 parts by weight p-dinitrosobenzene 2.25 parts by weight carbon black 3.00 parts by weight xylene 85.00 Parts by weight The same test as in Example 1 was carried out using this glass fiber cord. Table 2 shows the results.

[0037]

Table 2 Test results ================================= Example 1 Comparative Example 1 --- −−−−−−−−−−−−−−−−−−−−−−−−−−−−− Rubber compound Iroha Yellow −−−−−−−−−−−−−− −−−−−−−−−−−−−−−−−−−− Adhesive strength Initial 23.5 21.8 26.5 16.4 14.2 13.8 (kg / 25mm) Heat resistance 19.5 20.0 23.4 12.2 9.1 9.4 Water resistance 22.3 21.2 22.8 16.1 13.4 12.2 −− −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Belt Heat resistance 89 90 95 63 57 53 Strength retention rate (%) Water injection 76 71 70 53 55 48 ==================================

Table 2 (continued) ===================================== Example 2 Comparative Example 2 Comparison Example 3 ------------------------------------------ Rubber compound Iroiro Iroha- −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Adhesion Initial 22.5 20.3 24.0 16.7 14.6 14.1 23.8 18.5 16.7 (kg / 25mm ) Heat resistance 18.2 19.1 21.6 11.6 10.3 9.2 16.3 12.6 11.8 Water resistance 18.8 19.6 20.2 15.1 12.7 11.9 21.8 16.4 13.9 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−−−− Belt heat resistance 84 86 91 58 53 48 76 68 62 Strength retention (%) Water injection 80 75 74 55 57 43 73 62 55 ================== ===================

Example 3 In the same manner as in Example 1, a glass strand of 33.7 tex was obtained, and three strands of the glass strand were combined to form the following composition: -------------------. ------------- Resorcin-formaldehyde water-soluble condensate 30 parts by weight (R / F = 1 / 1.5 solid content 8% by weight) High nitrile group content Saturated polymer rubber latex 65 parts by weight (Zetpol latex 2020 iodine value 28 solid content 40% by weight) Zinc methacrylate 0.6 parts by weight 25% ammonia water 1 part by weight water 4 parts by weight -------- A treatment agent consisting of ------------------------------------ is applied so that the amount adhering to the glass fiber is 20% by weight. After that, heat treatment was performed at 280 ° C. for 2 minutes.

Next, this glass fiber bundle was subjected to a lower twist, a plied yarn and an upper twist in the same manner as in Example 1, and ECG150 3/11
A 2.1 S (Z) glass fiber cord was obtained. The treated cords thus obtained were arranged on the sheet of the rubber compound shown in Table 1 and vulcanized in the same manner as in Example 1 to obtain an adhesive strength test piece.

A peeling test was performed on the obtained test piece to measure the initial adhesive strength. Test piece obtained in the same manner
The peel test was measured after heat treatment in an air oven at 20 ° C. for 168 hours. In addition, the adhesive strength (water resistant adhesive strength) after boiling the test piece obtained in the same manner for 1 hour in water was measured. Table 3 shows the results.

Further, using the glass fiber cord obtained in the same manner as the reinforcing fiber and using the rubber having the composition shown in Table 1 as in Example 1, a toothed belt was prepared and a heat resistance running test and a water running test were conducted. . Table 3 shows the results.

Comparative Example 4 The same test as in Example 1 was carried out using a treating agent having the same composition as in Example 3 except that zinc methacrylate was not used. The results are shown in Table 3.

Comparative Example 5 The same secondary coating treatment liquid as used in Comparative Example 3 was applied to the glass fiber cord obtained in Comparative Example 4 with a nonvolatile content of 2.5.
The glass fiber cord provided with the secondary coating layer was obtained by coating and drying so that the content was ˜3.5 wt%. The same test as in Example 3 was carried out using this glass fiber cord. The results are shown in Table 3.
Shown in

[0045]

Table 3 ==================================== Example 3 Comparative Example 4 Comparative Example 5 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Rubber compound Iroiro Iroha −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Adhesion Initial 25.6 23.8 27.2 19.5 17.3 16.0 22.7 19.4 17.8 (kg / 25mm) Heat resistance 22.1 20.4 25.7 14.6 12.5 11.2 16.3 14.1 12.5 Water resistance 24.5 23.6 24.9 17.7 14.6 13.3 19.4 17.6 14.2 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− −−−− Belt Heat resistance 90 93 97 69 63 57 82 75 63 Strength retention rate (%) Water injection 74 72 78 58 51 51 64 56 57 =================== ==================

As shown in Tables 1, 2, and 3, Example 1,
It can be seen that Nos. 2 and 3 are superior in adhesive strength, particularly heat resistant adhesive strength, and excellent in belt strength retention rate, particularly in heat resistant belt strength retention rate, as compared with Comparative Examples 1 to 5.

[0047]

EFFECTS OF THE INVENTION The hydrogenated nitrile rubber product reinforced with the glass fiber cord of the present invention has a high heat resistance, and its strength does not decrease much even when repeatedly subjected to bending stress in a high temperature environment.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location D06M 101: 00

Claims (6)

[Claims] 1. A nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) excluding the highly saturated polymer rubber latex, an acrylic acid salt or a methacrylic acid salt (C). And resorcinol-formaldehyde water-soluble condensate (D) in a solid content weight ratio of 15 to 95% by weight, 0 to 70% by weight, and 0.01% by weight, respectively.
A glass fiber for reinforcing hydrogenated nitrile rubber, which is coated with a treating agent containing 5 to 15% by weight and 2 to 15% by weight. 2. The nitrile group-containing highly saturated polymer rubber latex (A), the rubber latex (B), the acrylate or methacrylate (C) and the resorcin-formaldehyde water-soluble condensate (D). 15 to 80% by weight and 5 to 70% by weight of solid content, respectively.
The glass fiber for reinforcing hydrogenated nitrile rubber according to claim 1, which is contained in an amount of 0.01% by weight, 0.01-5% by weight and 2-15% by weight. 3. The rubber latex (B) is a butadiene-styrene copolymer latex, a dicarboxylated butadiene-styrene copolymer latex, a vinylpyridine-butadiene-styrene terpolymer latex, an isoprene rubber latex, a chloroprene rubber latex, The glass fiber for reinforcing hydrogenated nitrile rubber according to claim 1, which is at least one selected from the group consisting of chlorosulfonated polyethylene latex and acrylonitrile-butadiene copolymer latex. 4. The glass fiber for reinforcing hydrogenated nitrile rubber according to claim 3, wherein the rubber latex (B) is a mixture of vinylpyridine-butadiene-styrene terpolymer latex and chlorosulfonated polyethylene latex. 5. The acrylate or methacrylate (C) is selected from the group consisting of zinc acrylate, zinc methacrylate, lead acrylate, lead methacrylate, aluminum acrylate, and aluminum methacrylate. The glass fiber for reinforcing hydrogenated nitrile rubber according to claim 1, which is one type of the glass fiber. 6. The glass fiber for reinforcing hydrogenated nitrile rubber according to claim 1, wherein the treating agent is attached to the glass fiber cord in an amount of 10 to 30% by weight in terms of solid content.