JPS595442B2 - tire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire using silicon carbide fiber as a cord material.

Conventionally, pneumatic tires used for automobiles, airplanes, etc.
Strong human silk, nylon, etc. are used as cord materials.

However, as vehicles become faster, there is a need for pneumatic tires that are safe and can run at high speeds. Therefore, various types of high-strength and heat-resistant fibers have come to be used for the purpose of improving wear resistance, load resistance, heat resistance, and the like. Examples include organic fibers such as polyester fibers and aramid fibers (manufactured by DuPont, known under the trade name "Keplar"), and inorganic fibers such as glass fibers and scale fibers. However, organic fibers are not as good as inorganic fibers in terms of heat resistance, strength, and elastic modulus, and glass fibers have poor wettability with rubber. However, scale fibers have a large specific gravity and require treatment such as metal plating to improve wettability with rubber or to improve corrosion resistance.
-There were some drawbacks.

The present inventor developed the tire of the present invention based on the knowledge that silicon carbide fibers with an ultrafine particle structure and high strength obtained from a silicone polymer whose main skeleton components are carbon and silicon have good heat resistance and wettability with rubber. completed.

Silicon carbide fiber, which has an ultrafine particle structure and high strength, is an organosilicon compound whose main skeleton components are silicon and carbon.
It can be obtained by using one or more types selected from the following types (1 to 01) as a starting material and using a catalyst, radiation, etc. if necessary.

For example, (1) a compound containing only Si-C bonds such as sila hydrocarbon;

(Si-C such as mono-, di-, and triorganosilane)
A compound that contains Si-H bonds in addition to bonds. (3) Compounds having Si-Hal bonds such as organo-logensilane (4) Compounds having Si-N bonds such as lysylamine. (ω Compounds having a Si-OH bond such as organosilanols, etc., represented by the chemical formula Si0R, such as organoalkoxysilane. (7) (CH3)3
Compounds containing Si-Si bonds such as SiSi(CH3)2CL. (8) Compounds containing Si-O-Si bonds such as ornosiloxine. (9)(CH3)2Si(0C0CH3
) Organosilicon compound esters such as 2. Q1(CH3)3
In Si00C.(CH3)3(1) to a0, R represents an alkyl group or an aryl group.

Further, in a vacuum or under any zero atmosphere selected from air, oxygen, inert gas, hydrogen gas, Co gas, CO2 gas, ammonia gas, and hydrocarbon gas, if necessary, under pressure at room temperature to 700°C. It can also be obtained by sufficiently ripening the starting material within a temperature range of 100 to 100°C to polymerize the low molecular weight polymer in the organosilicon polymer compound to form a high molecular weight polymer. Dissolve these raw materials in a solvent or
Alternatively, a step of heating and melting to create a spinning bath and spinning it, a step of preheating the spun yarn in a vacuum to volatilize the low molecular weight compound, and further a step of heating and melting the spinning bath in a vacuum to volatilize the low molecular weight compound, and further in a vacuum, an inert gas other than nitrogen gas, SiC is produced by firing at a high temperature of 800 to 2000°C in a zero atmosphere selected from CO gas and hydrogen gas.
It is obtained by the step of producing . Its characteristics are the following when fired at 1100℃ to fiber diameter 10μ.
It has the characteristics as shown in the table. The silicon carbide fibers obtained in this way have very good wettability with rubber (including natural rubber and synthetic rubber), probably because they are composed of ultrafine particles, and have more than twice the strength and specific gravity of glass fibers. It has the characteristic of being less than 1/2 that of iron.

Therefore, tires using rubber-reinforced fiber cords reinforced with silicon carbide fibers have excellent wear resistance, load-bearing properties,
Heat resistance has been significantly improved. In particular, it was very effective when used on the carcass or part of the breaker. The tire of the present invention was most suitable for pneumatic tires, and was effective in both bias type and radial types. In addition, because it has good wettability with rubber without the need for pretreatment like steel cord, it is possible to reduce weight and significantly improve cornering performance. Examples of the present invention will be described below.

Example 1 A bias pneumatic tire of the present invention was manufactured using polyester cord in the carcass layer and silicon carbide fiber cord in the breaker layer.

(Characteristics of silicon carbide fiber, tensile strength 800k9/i, modulus of elasticity 45t/mΔ) As a comparative example, a bias pneumatic tire was manufactured using steel fiber made of high carbon steel as the breaker layer.0 (Characteristics of steel fiber, tensile strength 150kν Attack,
Elastic modulus 20t/ml! ) The resulting tire is size 6.4
5-13, the number of flies is equivalent to 4PR, which is equivalent to a displacement of 2
20,000 when installed on a 000Cc class passenger car! The wear index (-/71tm) during Cm running was compared.

Claims (1)

[Claims] 1. A tire characterized by using a rubber reinforcing fiber cord whose reinforcing material is a high-strength silicon carbide fiber produced from an organosilicon polymer compound whose main skeleton components are silicon and carbon.