Cheapest urethane rubber is a series of elastomer materials containing more urethane groups in the polymer backbone. It is actually polyurethane rubber, referred to as Cheapest urethane rubber or urethane rubber or polyurethane elastomer. In addition to urethane groups, polymer chains also contain ester groups, ether groups, urea groups, aryl groups, and fatty chains. It is usually formed by the reaction of oligomer polyols, polyisocyanates and chain extenders. Cheapest urethane rubber forms different structures and types depending on the raw materials used, the proportions, the reaction methods and conditions, etc. So do you know the performance of Cheapest urethane rubber? Let's take a look at it briefly!
1. Excellent abrasion resistance: the abrasion resistance is very high among all rubbers. Laboratory measurement results show that the abrasion resistance of UR is 3 to 5 times that of natural rubber, and it is often as high as about 10 times in practical applications.
2. High strength and good elasticity in the hardness range of Shore A60 to Shore A70.
3. Good cushioning and shock absorption. At room temperature, the UR shock absorption element can absorb 10%~20% of the vibration energy. The higher the vibration frequency, the greater the energy absorption.
4. Good oil resistance and chemical resistance. UR has a low affinity with non-polar mineral oils, and is hardly corroded in fuel oils (such as kerosene, gasoline) and mechanical oils (such as hydraulic oil, engine oil, lubricating oil, etc.), and is much better than general rubber. It is comparable to nitrile rubber. The disadvantage is that it has greater swelling properties in alcohols, esters, ketones and aromatic hydrocarbons.
5. The friction coefficient is relatively high, generally above 0.5.
6. Low temperature resistance, ozone resistance, radiation resistance, electrical insulation, and good bonding properties.
The above is a brief introduction to the performance-related knowledge of Cheapest urethane rubber.