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Your location: Home > Related Articles > Rubber wear معدات اختبار

Rubber wear معدات اختبار

Author: Released in:2022-12-09 Click:39


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Rubber wear is a relatively complicated mechanical process and there are many factors that influence it. The wear of rubber has the following three forms: First, wear: When rubber comes into contact with a rough surface with a high coefficient of friction, the sharp particles on the friction surface will continuously cut and tear off the rubber surface layer. The second is curl wear: when the rubber comes into contact with a smooth surface, the rubber tears due to friction and the torn pieces of rubber fall off on rollers. The third is fatigue wear: the wear caused by the surface fatigue of the rubber surface layer under the influence of cyclic stress.

The abrasion resistance of rubber mainly depends on its strength, elasticity, hysteresis, fatigue and friction. Tensile strengthis one of the important properties that determine the abra's ion resistance of rubber. In general, the wear resistance increases with the tensile strength, especially when rubbing on rough rubber surfaces, the wear resistance mainly depends on the strength value. The influence of constant strain stress on wear resistance varies with different wear forms. With regard to wear and curl wear, increasing the constant elongation stress has a favorable effect on wear resistance, but a negative effect on fatigue wear. At the same time, increasing the elasticity of the rubber will also improve its wear resistance.

Rubber with low Tg has good abrasion resistance, and the abrasion resistance of rubber increases with the decrease of Tg, such as BR. When there is a conjugated system in the molecular structure of the raw rubber, the wear resistance of the rubber can be improved, such as SBR.

Due to its strong polarity in the main chainand more benzene rings, PU has the highest mechanical strength and wear resistance at room temperature. The best in rubber. However, the heat resistance is poor, and the wear resistance will drop sharply when the temperature is increased, and the heat generation is large, which is not conducive to the manufacture of high-speed products. CR and NR have high mechanical strength and good wear resistance.

The variety, dosage and degree of dispersion of the filling reinforcing agent have a major influence on the wear resistance of rubber. Abrasion resistance is directly related to the content of the adhesive. Any factor that can increase adhesive adhesion is beneficial for abrasion resistance. Therefore, the abrasion resistance of vulcanized rubber increases with the decrease in carbon black particle size, the increase in surface activity and dispersibility, and there is a suitable dosage. The dispersibility of carbon black has the greatest influence on the abrasion resistanceity of the compound. Under harsh conditions, the structural impact of carbon black is significant. The filler treated with the coupling agent is beneficial to improve wear resistance. Vulcanizates with good abrasion resistance generally have better tensile and tear strength. Appropriate addition of self-lubricating fillers, such as mica and polytetrafluoroethylene powder, is also conducive to improving the wear resistance of vulcanized rubber.

With the increase of the cross-linking density, the wear resistance has an optimal value. Tires in actual use Experiments have shown that making vulcanized rubber with more monosulphide bonds can improve the wear resistance of tires on slippery roads. The use of suitable anti-aging agents can improve wear resistance, especially under fatigue wear conditions. The more effective anti-aging agents are 4010, 4010NA, 4020 and so onforth.

Friction and wear of rubber

Rubber is widely used in car tires, tapes, rubber rollers, seals, rubber shoes and other products subject to friction and wear. The friction and wear of rubber drive the performance of equipment such as cars and machinery, and are closely related to issues such as safety and economics.

Where friction occurs, it is inevitably accompanied by wear, and this phenomenon is generally more complicated and determined by many factors. Therefore, there are still many aspects of friction that do not have a uniform explanation. However, people's understanding of tribology (the science of friction, wear and lubrication) and friction and wear systems is constantly expanding.

The coefficient of friction of rubber is generally greater than that of metal, and the strength and elastic modulus are improved by filling soot, so the wear resistanceis also improved. In addition, rubber has a lower thermal conductivity than metal materials and exhibits viscoelastic properties, so its mechanical properties change significantly when the temperature changes slightly.ly. In addition, compared to metal, rubber is prone to aging.

There are several explanations for the peak of the coefficient of friction. The simplest explanation is that the contact area A and the shear strength S change with the sliding speed v, and the frictional force F depends on the product of A and S, and hence the peak of the coefficient of friction.

The wear form of rubber The wear form of rubber can be divided into the following types:

(1) Abrasive wear ( abrasive wear): Wear caused by hard and pointed protrusions scratching the rubber surface.

(2) Adhesive wear: wear caused by frictiong between the rubber surface and the smooth surface.

(3) Fatigue wear: Wear caused by rubber surface fatigue.

(4) Curly wear (roller wear): Abrasion that produces curly scouring powder.

(5) Oily wear (oily wear): The friction surface is covered with low molecular weight rubbercaused by friction, and the other side is worn by mutual movement, indicating wear at low wear rates.

(6) Pattern Wear (Pattern Wear): A wear pattern where the rubber surface wears out as wear patterns develop. Rubber also causes this type of wear with abrasive wear and fatigue wear.

Wear patterns are roughly divided into For the above six types, for rubber, the above (4) and (6) are common in the abrasive wear (1), and several species of swear compound situations.