Introduction and application of lubricants

After the molten polymer lubricant generally has higher viscosity, in the process, the molten polymer through the slit, gate runner so when bound to the polymer melt processing machinery friction surface , some friction of the polymer processing is very unfavorable, these frictions fluidity of the melt, and cause severe friction film surface becomes rough, or if the lack of luster rhyolite. To do this, need to be added in order to improve lubricity, reduce friction, for the purpose of reducing the interfacial adhesion additives. This is the lubricant. Lubricants In addition to improving mobility, but also can play a melt accelerator, anti-adhesion and anti-static agent, slip agent effect.Metal soap
Lubricants can be divided into two kinds of external lubricant and lubricant inside and outside lubricant is mainly to improve the polymer melt processing equipment with hot metal surfaces rubbing. Poor compatibility with the polymer which is easy to migrate out from the melt, so that the plastic melt in the interface with the metal to form a thin layer of lubricant. Lubricants and polymers have good compatibility, which serve to reduce the polymer inside the role of cohesion between the polymer molecules, thereby improving the internal friction of the plastic melt heat and melt fluidity. Commonly used lubricants are stearic acid and salts thereof outside; internal lubricant is a low molecular weight polymer. Some other function of the lubricant. Each lubricant has actually can achieve a desired effect, always together internal and external lubrication, except in one respect more prominent. A lubricant in the same or different polymers different processing conditions will exhibit different lubrication, such as high temperature, high pressure, the internal lubricant is squeezed out and become external lubricant.PVC impact modifier
In plastic film production, we will encounter some of the adhesion phenomena, such as in the production of plastic film, is not easy to separate the two films, which gives high-speed automatic packing difficult. To overcome it, the resin can be increased by adding a small amount of surface lubricity additives to increase the external lubrication, generally referred to as anti-blocking agent, or slip agent. General molecular structure of the lubricant, there will be long chain non-polar group and a polar group in two parts, they are in different compatibility of the polymer is not the same, thus showing the effect of different internal and external lubrication. According to chemical composition, commonly used lubricant can be divided into the following categories: fatty acids and their esters, fatty acid amides, metal soaps, hydrocarbons, silicone compounds and the like.