JPH06102738B2 - Tread rubber composition for tire - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tread rubber composition for tires.

(Prior Art) Conventionally used spike tires are skid resistant,
Traction is good, but general pavement road surface is scraped,
The dust that results is a problem.

(Problems to be Solved by the Invention) An object of the present invention is to solve the above problems on a general pavement road surface by providing a tire tread rubber composition which is a non-spiked tire and is excellent in both ice performance and snow performance. To provide.

(Means for Solving the Problem) The present invention provides a tread rubber composition for tires containing at least one of diene rubber, silica and carbon black, wherein the extractable component (E) defined below is represented by the formula (1). And the average particle size of 0.01 to 5 mm of the pulverized plant is a rubber component 100 after extraction of the following vulcanized rubber with acetone chloroform.
The present invention relates to a tread rubber composition for tires, which is used in an amount of 3 to 50 parts by weight based on parts by weight.

E <0.4 (A-38) (1) E: Rubber content of vulcanized rubber after extraction with acetone / chloroform 100
Part by weight of the acetone-chloroform extract relative to parts by weight A: 100 parts of the vulcanized rubber after extraction with acetone-chloroform
The sum of the carbon black part by weight and 1/2 silica part by weight relative to the parts by weight includes natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR) and isoprene as the diene rubber component of the rubber composition of the present invention. Rubber (IR), butyl rubber (II
R) and blends thereof can be used. At least one of silica and carbon black is blended in the rubber component. Silica and carbon black are rubber
30 to 80 parts, preferably 35 to 55 parts are preferably added to 100 parts (parts by weight, the same applies hereinafter).

The extract (E) defined below in the rubber composition of the present invention satisfies the formula (1).

E <0.4 (A-38) (1) E: Rubber content of vulcanized rubber after extraction with acetone / chloroform 100
Part by weight of the acetone-chloroform extract relative to parts by weight A: 100 parts of the vulcanized rubber after extraction with acetone-chloroform
The total of carbon black parts by weight and 1/2 silica parts by weight relative to parts by weight. Here, the acetone chloroform extraction method, the polymer and the amount of carbon are measured according to JIS K6350. The amount of silica is measured according to the method of JIS K6220. Acetone-chloroform extract components are mainly oils, antioxidants and waxes.

In the present invention, the pulverized product of the plant is further added in an amount of 3 to 50 per 100 parts by weight of the rubber component after extraction of the vulcanized rubber with acetone and chloroform.
Use parts by weight. Examples of the pulverized product include sawdust, walnut shells, cork, peanut shells, ginkgo husks, straw, and chaff. The preferred average particle size of the pulverized product is 0.02
~ 1 mm. If the particle size is less than 0.01 mm, the effect is small, 5 mm
If it exceeds the range, the pulverized product is likely to fall off from the vulcanized rubber and the desired effect cannot be obtained.

In the present invention, the pulverized product with a large particle size as described above has little reinforcing effect on rubber, and when the pulverized product with a large particle size is mixed with soft rubber, the hardness of the rubber as a whole is increased, and the performance on snow is good. In addition, since the effect of binding the rubber of the pulverized product is low, it is in a microscopically soft state, and accordingly, the microscopically has a good grounding property and the performance on ice is good. Ice such as ice burn contains bubbles of about 0.01 to 0.1 mm,
If 1 to 5 mm of crushed material sticks out from the surface of the treaded rubber, when the tire passes over the ice, the presence of air bubbles will destroy the thin ice portion, which will cause a trap and a great braking effect on ice. Presumed to be done. In addition to the above effects, the pulverized product also has the effect of adsorbing water on the ice plate, and improvement is recognized.

In the present invention, other known vulcanizing agents of the above components, vulcanization accelerators, vulcanization accelerating aids, vulcanization retarders, organic peroxides, reinforcing agents, fillers, antiaging agents, tackifiers, Of course, a colorant or the like can be added.

The rubber composition of the present invention can be obtained by kneading the above components with a conventional processing device such as a roll, a Banbury mixer or a kneader.

The rubber composition of the present invention is suitably used for tires used in a ground pressure range of ³ to 15 kg / cm ² , for example, tires for trucks, buses, light trucks, and ultralight trucks. In particular, under the ground contact pressure condition of 6 to 15 kg / cm ² , the rubber obtained from the rubber composition of the present invention has an effect of slipping into the ice plate, the frictional force is increased, and the snow performance is also improved.

(Effects of the Invention) The rubber composition of the present invention has excellent low-temperature properties and is particularly suitable for use in icy roads and snowy roads.

(Example) Below, an example and a comparative example are given and demonstrated. Incidentally, "parts" means "parts by weight".

Examples and Comparative Examples 100 parts of rubber described in Table 1, 220 parts of carbon black N,
Each part of silica, each part of naphthene oil, 3 parts of zinc white, 3 parts of stearic acid, 1 part of antioxidant (Santofrex 13),
1 part of paraffin wax, 1.0 part of vulcanization accelerator (CBS) and 2 parts of sulfur were sufficiently kneaded with a Banbury mixer for 4 minutes to obtain a rubber composition.

Using this rubber composition, a pneumatic all-weather tire 650R16 10PR having a radial structure was produced, and hardness, performance on ice, and performance on snow were measured. Hardness according to ASTM D2228-
The value at 5 ° C. was measured. Performance on ice and snow is -8 ℃
According to actual vehicle tests on the ice ban and on snow. In all cases, the reciprocal of the stopping distance when braking suddenly when running at a speed of 40 km / h is shown as an index with the tire of compound No. 3 as 100, and the larger the value, the better. . The results are shown in Table 1. In addition, formulation Nos. 4 to 6 are examples, and others are comparative examples.

From Table 1, the formulations Nos. 4 to 6 of the examples are excellent in both the performance on ice and the performance on snow. However, the formulations Nos. 1 to 3 which do not satisfy the formula (1) are inferior in the on-snow performance, while the formulations Nos. 7 to 8 using the filler having the particle size or the compounding amount out of the range of the present invention have the improvement on the ice performance. Is insufficient. Formulation Nos. 9 to 10, which contain an appropriate amount of the filler but do not satisfy the formula (1), also have poor snow performance.

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Claims (2)

[Claims] 1. A tread rubber composition for tires containing at least one of a diene rubber, silica and carbon black, wherein an extract (E) defined below satisfies the formula (1) and has an average particle size. A rubber component obtained by extracting the vulcanized rubber with a diameter of 0.01-5 mm from the following vulcanized rubber with acetone-chloroform.
A tread rubber composition for tires, which is used in an amount of 3 to 50 parts by weight based on 100 parts by weight. E <0.4 (A-38) (1) E: Rubber content of vulcanized rubber after extraction with acetone / chloroform 100
Part by weight of the acetone-chloroform extract relative to parts by weight A: 100 parts of the vulcanized rubber after extraction with acetone-chloroform
Sum of carbon black part and 1/2 silica part by weight 2. The tread rubber composition for a tire according to claim 1, which is used for a tire having a ground pressure of 3 to 15 kg / cm ² .