The rubber sheets are used very loosely. It can be used indoors and outdoors for a long time. Rubber sheets can be made into many special properties and uses. This is an important factor in the development of the rubber sheet industry, such as high insulation rubber sheet, anti-static rubber sheet, high temperature rubber floor, oil resistance, acid and alkali resistance.
1. Rubber sheet oil resistance:
If the rubber product is in contact with the oil medium for a long period of time during use, the oil will penetrate into the rubber to cause expansion, thereby reducing the strength and other mechanical properties of the rubber. The oil can swell the rubber because the oil penetrates into the rubber, causing the molecules to diffuse and changing the network structure of the vulcanizate. The oil resistance of rubber depends on the polarity of the rubber and oil. A rubber molecule containing a polar group such as a cyano group, an ester group, a hydroxyl group, or a chlorine atom causes the rubber to exhibit polarity. When the polar rubber is in contact with the non-polar oil, the polarities of the two oil systems differ greatly, and the rubber is not easily expanded. For example, nitrile rubber, hydrogenated nitrile rubber, acrylate rubber, chlorohydrin rubber, chlorosulfonated polyethylene rubber, fluororubber, fluorosilicone gel, etc. have good oil resistance to non-polar oils.
2. Rubber sheet wear resistance:
Rubber sheets as dynamic seals are one of the main uses of rubber sheet performance testing. Due to the high rotational speed of the shaft, the sealing product must withstand large friction and torque. Especially in the case of poor lubrication, the heat generated in the sealing area is large, which may result in adhesion of the rubber or adhesion to the metal, resulting in damage of the seal and failure of the seal.
One of the effective ways to reduce the temperature of the friction zone is to add a lubricating filler to the rubber to reduce the friction coefficient of the rubber. For example, molybdenum disulfide and graphite are added to the rubber production formulation. In addition, using PTFE, PTFE has excellent resistance to medium and atmospheric aging, wide application range, good self-lubricating performance, and low friction coefficient. Its coating on rubber surface can greatly reduce the surface of rubber products. Friction coefficient to improve wear resistance. Resistance and dielectric resistance. However, the surface energy of polytetrafluoroethylene is very low and it is difficult to combine with other chemicals. At present, there are several methods for coating a polytetrafluoroethylene: irradiation grafting, plasma activation, chemical etching, electrostatic spraying, and dielectric. The surface energy of the fluorocarbon rubber after surface modification treatment is less than that of polytetrafluoroethylene.