Polyurethane rubber roller characteristics

1. Polyurethane rubber roller has some disadvantages in application due to its poor hydrolysis resistance. Polyester polyurethane rubber roller has poor hydrolysis resistance compared with polyether rubber roller, and the latter has hydrolysis resistance of about 5 -10 times. There are two effects of water on the polyurethane rubber roller. One is to produce plasticization from the absorbed water, so that the hydrogen bond between the molecules of the polymer itself is weakened, and the physical properties are lowered, but the water absorption process is reversible, and it will return to the original after drying.
2. There is no unsaturated bond in the polyurethane rubber roller, so its ozone resistance is excellent.
3. Although the rubber rubber roller has certain differences in the properties of the rubber roller due to different raw materials and manufacturing methods, the rubber roller also has a series of common properties due to the common structure. The modulus of the polyurethane rubber roller is between rubber and plastic. The biggest feature is the high hardness and high elasticity. This kind of performance is not found in other rubbers and plastics. Excellent wear resistance is also one of the characteristics of polyurethane rubber rollers.
4. The continuous long-term use temperature of polyurethane rubber roller is 80-90 degrees, the short time can reach 120 degrees, the low temperature resistance is better, the embrittlement temperature of polyester rubber roller is -40 degrees, and the polyether rubber roller can It is -70 to 80 degrees, but it is harder to harden at low temperatures.
5. The anti-fungal performance of the polyurethane rubber roller is extremely poor.
6. Polyurethane rubber roller has high tensile strength and high tear resistance. Its wear resistance is much better than general rubber, 9 times higher than natural rubber, but it is necessary to pay attention to wear resistance. Under actual conditions, it is also affected by factors such as heat generation, temperature, heat aging and ozone.
7. Polyurethane rubber roller is generally good in oil resistance and solvent resistance, especially for lubricating oil and fuel oil. It has better resistance to most solvents at room temperature than nitrile rubber roller, but with The increase in temperature, even in the absence of significant expansion, its performance is rapidly declining. The polyurethane rubber roller swells in an aromatic solvent or a polar solvent.
8. The rubber encapsulating material of polyurethane rubber roller is divided into two types: polyester and polyether. From the comparison of physical properties, it can be seen that the general low hardness rubber roller has better performance with polyester type, while the polyether type is inferior. The high hardness rubber roller is superior to the polyether type. Further, the polyester is excellent in oil resistance, heat resistance, and adhesion to metal, and the properties such as hydrolysis resistance, cold resistance, and antibacterial property are preferably polyether.
9. Polyurethane rubber roller is exposed to sunlight for a long time, the color is dark, the physical properties are gradually reduced, and a small amount of anti-aging agent and ultraviolet absorber can be added to improve weather resistance, while adding a small amount of coloring agent or carbon black can significantly improve weather resistance. performance.

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