Polyethylene wax used for PVC processing, also known as polymer wax referred to as PE wax, has excellent cold resistance, heat resistance and chemical resistance. In normal production, as an additive directly added to polyolefin processing, can increase the gloss and processing performance of the product. As a lubricant, it has stable chemical properties and good electrical properties. With low viscosity, high softening point, good hardness and other properties. It has good thermal stability, low volatility at high temperature, dispersibility of pigments in masterbatch application, excellent external lubricity, and strong internal lubricity, which can improve the production efficiency of plastic processing, good moisture resistance at room temperature, strong chemical resistance, excellent electrical performance, and can change the appearance of finished products.
Polyethylene wax can be divided into four production methods, which are dispersion method, micronization method, melting method and emulsification method.
1. Dispersion method: by adding wax to the solution, and then using dispersion equipment to disperse it, the product quality is low, the cost of consumption is not low, so it is not recommended.
2. Micronization method: this method is to use the mutual collision between the original wax, gradually form tiny particles, and then according to the quality difference, the use of centrifugal force for screening, and then collected, which is also a widely used production method at present. The general manufacturing methods of polyethylene wax include high pressure and low pressure polymerization. The wax obtained by high pressure has branch chain, low melting point and low pressure, although the wax obtained by low pressure is relatively hard, it is slightly less slippery.
3. Melting method: by adding the solvent in a closed high-pressure container, and then cooling down, to produce finished products; However, the disadvantage of this production method is that it is not easy to be controlled. Once the operation error occurs, it may lead to a major accident, so it is not suitable for the production of part of the wax.
4. Emulsification method: using this method to produce polyethylene wax can get more fine and round particles, it will be more effective when used in water-based systems, but the disadvantage is that the surface active agent will affect the water resistance of the film.
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