For PVC foam board, we will add lubricant to it when it is produced and processed. The addition of lubricant can increase the processing fluidity of our products and increase the usability of our products, but for its lubricants, How do we choose it in use?
There are many types of PVC foam board lubricants, from natural substances such as montan wax, paraffin wax, mineral oil, animal and vegetable oils to various low molecular weight polymers such as low molecular fluororesin, polyethylene, etc. Some aliphatics are commonly used Compounds such as stearic acid, stearic acid soaps, acid esters. And amide compounds. Some lubricants, such as oleic acid amide, stearamide, and fatty acid metal salts, are themselves good anti-sticking agents.
The internal lubricant of the PVC foam board has an affinity with the polymer, and its lubricating effect is mainly to reduce the mutual friction between polymer molecules, or to reduce the force between the molecules of the PVC grade polymer. The external lubricant is of low level, but it has a long carbon chain. Its lubricating effect is mainly to reduce the friction between the polymer and the processing machinery. The role of internal lubricants has the following aspects: make the resin plasticize stably, improve the processing performance; reduce the resin viscosity, increase the torque drop, increase the extrusion volume and production volume; improve the efficiency of the equipment. The role of the external lubricant: to prevent the decomposition and coloring of the resin caused by the resin and the molding machine, and to prevent the material from sticking to the surface of the processing machine. Increase the peeling performance of the roller surface, improve the release performance, and reduce the smoothness of the finished product surface.
The above is the introduction of PVC foam board lubricants, but we should pay attention to the following points when choosing, good dispersion, proper compatibility with polymers, good thermal stability, and high-temperature lubricity. It does not damage the physical properties of the material, and does not cause color drift. It is also necessary to select a suitable lubricant according to different processing methods and product types.
