1. Paraffin Wax
Although paraffin is an external lubricant, it is a non-polar linear hydrocarbon and cannot wet the metal surface, that is to say, it cannot prevent resins such as polyvinyl chloride from adhering to the metal wall. Only when used in combination with stearic acid and calcium stearate, synergistic effect can be achieved.
Liquid paraffin: freezing point -15–35 ℃, in extrusion and injection molding, the compatibility with resin is poor, the addition amount is generally 0.3%-0.5%, if it is too much, it will make the processing performance worse.
Microcrystalline paraffin: obtained in the process of petroleum refining, its relative molecular mass is large, and there are many isomers, the melting point is 65-90 ° C, the lubricity and thermal stability are good, but the dispersibility is poor, the dosage is generally 0.1 %-0.2%, preferably used together with butyl stearate and higher fatty acid.
2. Fatty acids, fatty amides and esters
Stearamide and higher alcohol can be used together to improve lubricity and thermal stability. The dosage (mass fraction, the same below) is 0.3%-0.8%, and it can also be used as a slip agent for polyolefin; hexenyl bis-stearamide, also Called ethylene bis-stearamide, it is a high melting point lubricant with an dosage of 0.5% to 2%; stearic acid monoglyceride, tristearic acid glyceride; oleic acid dosage of 0.2% to 0.5%; hydrocarbon Paraffin-like solid, melting point is 57～70℃, insoluble in water, soluble in organic solvent, dispersibility, compatibility and thermal stability in resin are all poor, the dosage is generally below 0.5%
Low molecular wax is a series of oligomers with different properties which are obtained by cracking and oxidizing various polyethylene (homopolymer or copolymer), polypropylene, polystyrene or other polymer modifiers as raw materials. .
Its main products are: homopolymer, oxidized homopolymer, ethylene-acrylic acid copolymer, ethylene-vinyl acetate copolymer, low molecular ionomer and other five categories. Among them, polyethylene wax, the chemical name of polyethylene wax is polyethylene glycol, and the English name PEG (Poly Ethylene Glycol) is the most commonly used.
4. Metal soap
The metal salts of higher fatty acids are called metal soaps. For example, barium stearate is suitable for various plastics, and the dosage is about 0.5%; zinc stearate is suitable for polyolefin, ABS, etc., the dosage is 0.3%; calcium stearate is suitable for Suitable for general-purpose plastics, external lubrication, the dosage is 0.2%-1.5%; other stearic acid soaps such as cadmium stearate, magnesium stearate, copper stearate.
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