KR820001871B1 - Rubber composition - Google Patents

Abstract

The adhesion and strength of reinforced rubber is improved by addn. of>0.5 phr Co salt of an org. acid>0.5 phr hydroxybenzoic acid deriv. Thus, vulcanizates of compounded natural rubber contg. cobaltous stearate 3, p-hydroxybenzoic acid(1) 6, and Hitanol 2501(II)(alkylphenol resin) 5 phr have tensile strength 236 kg/cm2, elongation 460%, 300% modulus 151kg/cm2, JIS A hardness 69, and H-test adnesion to RFL-treated kevlar cords 15.0 kg/cm2, compared with 239, 340, 174, 78, and 8, resp., in the absence of I and II.

Description

Rubber composition

The present invention relates to a rubber composition which provides good adhesion between these materials in the production of a composite of rubber, a metal material, a fiber material and the like.

When bonding a metal material such as rubber and steel-co-de or fiber material such as nylon-co-de, the former is plated with copper alloy or zinc such as brass or bronze on the surface of steel- or steel-co-de. The latter method is generally known, and the latter method is generally known in which the surface of the nylon code is treated with RFL solution (resorcinopromaldehyde-latex).

Moreover, in order to improve adhesiveness, the method of mix | blending a specific component in the rubber side with or without the said method, for example, the method of mix | blending organic acid cobalt, such as cobalt naphthenic acid, cobalt stearate, cobalt octylate, with rubber | gum. This is commonly known. However, this adhesive system has the drawback of rapidly losing adhesive strength due to excessive vulcanization time or excessive heating at temperature, and also has low moisture resistance to adhesion.

As a countermeasure, a method of incorporating alkylphenol resin into the present system and supplementing adhesion deterioration due to genine vulcanization is known. However, in this case, improvement in moisture resistance is not expected and vulcanization is delayed.

An object of the present invention is to obtain a rubber composition which improves the above drawbacks.

The rubber composition of the present invention (hereinafter referred to as rubber composition (1)) is 0.5 parts by weight or more, preferably 0.5 to 10 parts by weight of organic acid cobalt and 0.5 parts by weight or more to monooxy benzoic acid, preferably 0.5 to 10 parts by weight, based on 100 parts by weight of rubber. It is mix | blended and mix | blended a weight part.

When the compounding quantity of organic cobalt acid and monooxybenzoic acid is less than the lower limit, respectively, the objective of this invention is not achieved. On the other hand, when the upper limit is exceeded, the effect does not increase as compared with the increase of the compounding amount, and adversely affects the physical properties of the rubber itself.

By incorporating organic cobalt and monooxybenzoic acid into rubber, a rubber composition having good adhesion to a metal material is obtained by vulcanization which does not slow the vulcanization rate of the unvulcanized rubber composition and does not degrade the adhesion even when overvulcanized.

To the electrical rubber composition (1) of the present invention, one or two kinds of alkylphenol-based resins and cresol formalin-based resins are added in an amount of 0.5 parts by weight or more, preferably 0.5 to 10 parts by weight, based on 100 parts by weight of rubber. The adhesiveness of and the moisture resistance of the adhesion before or after vulcanization can be improved (hereinafter, this rubber composition is referred to as rubber composition (II)). If the amount of the alkylphenol resin or the cresol formalin counting paper is less than 0.5 parts by weight, the object of the present invention cannot be achieved. If the content is more than 10 parts by weight, the effect is not increased any more and the physical properties of the rubber are lowered.

In the present invention, rubber refers to general-purpose rubber (natural rubber, polyisoprene rubber, styrenebutadiene rubber, polybutadiene rubber, etc.), and alkylphenol counting paper is t-butylphenol formalin resin, p-octylphenol. The formalin resin, the cashew-modified phenol resin denatured, the dicyclopentadiene-modified phenol resin, etc., and the cresol resin refer to allocresol formalin resin, paracresol formalin resin and the like.

[Examples 1-7, Standard Example 1, and Comparative Example 1]

The formulations of Examples 1 to 7, Standard Example 1 and Comparative Example 1 are shown in the later Table 1 and the test results in the Late Table 2.

Preparation and Vulcanization of Rubber Compounds

Master batch was blended with a balm-mixer and the vulcanized system was mixed with a roller to prepare a rubber compound.

Vulcanization for physical property tests was performed at 145 degreeC for 45 minutes.

TABLE 1

TABLE 2

[Examples 8-14, Standard Example 2 and Comparative Example 2]

The formulations of Examples 8 to 14, Standard Example 2 and Comparative Example 2 are shown in later Table 3 and test results in later Table 4.

Preparation and Vulcanization of Rubber Compounds

The master-batch was blended with a balm-mixer and the vulcanized system was mixed with a roller to prepare a rubber compound.

Vulcanization for physical property tests was performed at 145 degreeC for 45 minutes.

TABLE 3

TABLE 4

Adhesion test

1) Adhesion test with metal materials: 145 ℃ × 45 ', 160 ℃ × coated fabric (1 inch) coated on both sides of brass plated or galvanized steel cord with rubber compound in parallel at 125mm intervals. It was vulcanized at 20 'and 160C x 60', respectively, and a steel cord drawing test was conducted. Pullout test was performed according to ASTMD 2229.

2) Adhesion test with fiber material: H test was conducted in accordance with ASTMD 2138 for evaluation of adhesion with nylon fiber or kepla-fiber (vulcanization condition 148 ° C. × 30 ′).

Ni-Sko-Chee type (t ₃ )

It measured according to JISK 6301 (measurement temperature: 125 degreeC).

Rheometer-ta-vulcanization measurement T95

The time until reaching 95% torque of the maximum torque is indicated as T95 for the measurement of proper vulcanization time by Rheometer-Ta manufactured by Monsanto (Measurement temperature: 160 ° C).

In the rubber composition (1) obtained from the present invention in Table 2, the vulcanization rate is equal to or higher than that of the standard example, and moreover, the adhesive strength as a suitable vulcanization (145 ° C. × 45) is also superior to that of the standard example 1 and the comparative example 1, and It can be seen that the adhesive force at 160 ° C. × 60 ′) is excellent at break.

This fact is remarkable for the rubber part (rubber coverage) of the peeling surface of the draw wire.

In addition, the physical properties of the present invention are not inferior to the standard and comparative examples, and the other workability is not sticky to the rolls and is easier to knead than the comparative example.

In Table 4, the compounded rubber (II) based on the composition to which the alkylphenol resin or cresol formalin counter of the present invention was added is vulcanized, which is equivalent to the conventional standard examples 2 and 2, but is clearly excellent in adhesive strength.

In other words, the RFL-treated nylon kebura-cod and galvanized steel cord are excellent in adhesion, especially for brass plated steel cord, when unvulcanized rubber and vulcanized rubber samples are exposed under high humidity. Yes, the moisture resistant adhesiveness is displayed compared with the comparative example. In Korea under high humidity, such properties are particularly important when the rubber wire material composite is manufactured and used, and is a significant improvement by the present invention.

As described above, it is used as a new adhesive rubber composition without any vulcanization and a good vulcanization in any of vulcanization and pervulcanization, suitable for adhesion with the wine material obtained in the present invention.

In addition, the rubber composition (II) is excellent in adhesion to nylon co-de Kepula-co-zinc galvanized and brass plated steel cod, and has heat resistance in vulcanization and no vulcanization is delayed. In particular, it is used as a new adhesive rubber composition, that is, as a core material of a fiber material or a metal material and a rubber composite, for example, a tire body and a comb belt, in terms of adhesion to brass plated steel cords.

Claims (1)

A rubber composition having good adhesiveness with a metal material, by combining and vulcanizing 0.5 parts by weight or more of organic acid cobalt and 0.5 parts by weight or more of monooxy benzoic acid in combination with 100 parts by weight of rubber.