Silicone rubber skeleton material and fabric

The role of skeleton material is to withstand the internal and external forces from rubber products, improve the strength of rubber products, and limit their deformation. It largely determines the use of rubber products performance value, so most rubber products, such as tires, rubber hose, rubber

Rubber shoes, tape, etc., all need to use skeleton materials as reinforcement materials.

Basic requirements of rubber products for skeleton materials:

1. High strength, modulus and resilience

2. Good heat resistance

3. Good fatigue resistance

4. Good dimensional stability

5. Good adhesion to rubber (surface dip treatment)

6. The price is low

7. The relative density is small, conducive to lightweight

8. Good corrosion resistance and flame retardant properties

Types and properties of skeleton materials commonly used in rubber industry

1. Cotton fiber

Cotton fiber has low strength, poor heat resistance and fatigue resistance, low elasticity and high heat generation.

2. rayon

The strength, fatigue resistance and heat resistance of rayon are higher than that of cotton fiber. The initial elastic modulus is high and the dimensional stability is good, but the strength loss after hygroscopic is large.

3. Polyamide fibre

Polyamide fiber is also known as nylon, which is divided into nylon -6, nylon -66 and other kinds. Nylon fiber has high strength, good fatigue resistance and excellent impact resistance, but it has low elastic modulus, large thermal shrinkage, poor dimensional stability and poor adhesion of rubber.

4. Polyester fiber

Polyester fiber is commonly known as polyester. It has high strength, good heat resistance, fatigue resistance and dimensional stability. Due to high fatigue heat generation and easy to cause amination, hydrolysis and so on, reduce the strength of cord. And rubber adhesion is poor.

5. Polyvinyl alcohol fiber

Polyvinyl alcohol fiber is also known as vinylon or vinylon. Its strength and elastic modulus are higher than cotton fiber, but not as good as nylon. Adhesion to rubber is worse than cotton fiber, but better than nylon and polyester fiber, chemical corrosion resistance is also very good, but heat resistance is poor.

6. Fiberglass

Glass fiber has high strength, excellent heat resistance and corrosion resistance, good electrical insulation and heat insulation performance, but the fatigue resistance and adhesion with rubber is very poor.

7. Steel wire

Steel wire is one of the important skeleton materials of rubber products, and its position in rubber fiber is increasing day by day. It is not only an essential material for the manufacture of tire wire rim, but also widely used for steel cord fabric with the development of radial tire. In addition, it is also widely used in steel wire braiding, winding hose and other rubber products. Steel wire has the advantage of excellent heat and thermal conductivity. The initial elastic modulus is high. But the ratio is heavy, fatigue resistance, adhesion to rubber and chemical corrosion resistance is poor.

The performance comparison between several commonly used fibers is as follows:

The intensity of

Vinylon > Nylon-6 > Polyester > Rayon >-- Cotton fiber (dry condition)

Vinylon > Polyester > Nylon -- 6> Cotton fiber > Rayon (under wet conditions)

Heat resistant performance

Polyester > Vinylon > nylon - 6 > rayon > cotton fiber

hygroscopic

Rayon > cotton > Vinylon > nylon - 6 > polyester

elongation

Nylon - 6 > polyester > rayon > Vinylon > cotton fiber

8. High modulus aromatic polyamide fibre

This kind of fiber is dupont company in the United States at the beginning of the sixty's began to study, the early seventy's successfully developed a comprehensive performance of excellent nova fiber. Originally called B fiber, later changed to Kevlar, now known as aramid in China.

B fiber has the advantages of both synthetic fiber and steel wire, known as "synthetic steel wire". Its strength is 5 times that of steel wire, and the elongation is only 3. 7 ~ 4. 2%, and almost no contraction (the contraction rate is only 0-0.2). Excellent fatigue resistance, small specific gravity, good chemical corrosion resistance, is the most economical substitute for steel cord fabric.

Suitable for closed isocyanate/epoxy resin of polyester curtain, phenolic butadiene latex immersion system is also suitable for B fiber.