中文版

Wear resistance is the ability of vulcanizate to resist material loss due to surface damage under the action of friction, and is a mechanical property closely related to the service life of rubber products. There are several surface forms of abrasion resistance. What factors affect the abrasion resistance? How to improve the abrasion resistance of rubber products when designing the formula?

1. Forms of wear resistance

Wear resistance mainly includes the following three forms: wear and tear, fatigue wear and crimp wear.

Wear and abrasion means that the uneven sharp rough objects on the surface are constantly cut and rubbed, resulting in the rubber surface contact points being cut and torn into tiny particles, which fall off from the rubber surface. The wear resistance is affected by friction pressure, tensile strength and resilience.

Fatigue wear means that rubber products are repeatedly subjected to periodic compression, shear, tension and other deformation under continuous work, which makes rubber surface fatigue and gradually produce cracks. Fatigue wear is related to elastic modulus, pressure and tensile strength of rubber.

Curling abrasion means that when the rubber contacts with the smooth surface, due to the friction force, the uneven part of the vulcanizate surface will deform, be torn and damaged, and fall off in cycles.

2. Effect of matching system on wear resistance

The abrasion resistance is related to the curing system, and the abrasion resistance can be improved by increasing the degree of crosslinking appropriately. The more single sulfur bonds, the better the wear resistance, and the better the semi effective vulcanization system wear resistance. The abrasion resistance of vulcanizate has a maximum value with the increase of the amount of curing agent. Generally, the abrasion resistance of accelerator CZ system of sulfur HY13S10J2LWFM curing system is better. The DTDM+sulfur+accelerator NOBS system vulcanizate has good wear resistance and other mechanical properties.

In general, the abrasion resistance of vulcanizates increases with the decrease of carbon black particle size and the increase of surface activity and dispersion. The smaller the reinforcement performance, the smaller the influence of the filler, and the greater the amount of filler, the greater the influence. The filler should be used as little as possible.

Softener has influence on the abrasion resistance of vulcanizate. Generally, the addition of softener can reduce the abrasion resistance of vulcanizate.

Under the condition of fatigue wear, the anti-aging agent can improve the abrasion resistance of vulcanizate. The type of antioxidant that can prevent fatigue aging and has excellent odor and aging resistance is the best.

3. How to improve wear resistance

In order to produce rubber products with good wear resistance, the rubber with good wear resistance should be selected first. CZ can be used as accelerator in curing system; Select carbon black with small particle size to improve the dispersion of carbon black and effectively improve the abrasion resistance of rubber compound; Reduce the dosage of softener appropriately; Select the antioxidant with good fatigue resistance to improve the abrasion resistance of the rubber compound; Additional fillers such as silane coupling agent or molybdenum disulfide are selected to improve the abrasion of rubber compound.

The abrasion resistance of rubber products directly affects the service life of the products. When designing the formula, select the appropriate rubber type and the appropriate mixing agent to improve the abrasion resistance of the rubber material as much as possible, so as to extend the service life of the products.