Pu castor how to resist external erosion
Pu castor how to resist external erosion? Bearing is also called the rolling bearing, including: roller bearing, needle roller bearing and ball bearing. The main difference is the roller bearing used in the occasion of the radial pressure; Needle roller bearing is suitable for the radial pressure and rotation speed of the smaller occasions; Ball bearing is suitable for the occasion of small radial pressure and high speed. Almost the same in the same size, speed, the radial load cylinder is greater than the ball bearing axial load; Columns under axial load in the opposite direction or generally don't bear axial load, individual models can be subject to bi-directional load, commonly used in the shaft of the free end; Ball bearings can withstand two-way load in the fixed end. Can tell, the same brand, same lubrication, under the condition of same load cylinder bearing is greater than the life of a ball bearing. Type polyurethane material with similar common thermoplastic plastic hardness and high mechanical strength, plastic processing methods may be used for production, at the same time, it has general elastomer elongation, elastic resilience and stress deformation recovery performance, use TPUR high strength and elongation at break, especially excellent tear resistance, bending resistance and wear, preparation, shoemaking, auto electrical, style can be used in many fields such as all kinds of wear-resistant, suspension parts. The material is suitable for working in a bad long-term load, excellent wear resistance. The heat resistance of the material is not outstanding, only allow long exposure to the work environment under 80 ℃, soft and medium hardness grade TPU can short time exposure to the work under the environment of 100 ℃. High hardness grade can work under 120 ℃ environment for short periods of time, TPU excellent performance under low temperature and has high impact strength, material in - Below 20 ℃ will not break. Because it is mainly composed of direct chain of chemical bonds, poor ability to resist external medium erosion, therefore, the chemical material such as acid and alkali resistant performance is poorer, to contain ethanol elements such as motor oil have larger dissolve sex, but for pure mineral oil, esters medium has a good ability to resist. General good weatherability of TPU. Although it under long-term exposure to the sun's ultraviolet rays can produce slight yellow, but the performance of the materials will not be affected by too much. Usually used in outdoor TPU products are formulated with uv absorber, sometimes can add carbon black pigment when conditions permit, make material can effectively absorb ultraviolet light and ultraviolet shielding, improve the service life of materials. Disadvantages of this kind of product is oil resistant, heat resistant material and mechanical properties as the CPU. Pu castor how to resist external erosion? More news and information about pu castor please click: hynews / 161. html