plastic lubricant dispersant difference

 Lubricant is a broad concept. According to their different functions, the lubricant for the following three categories: (1) to reduce the friction between the particles to improve the  the materials, also known as  glidants); (2) to prevent the adhesion of raw materials to punch surface of the material, also known as anti-adhesion agent ); (3) to reduce the particle or tablet) with the friction between the die hole wall accessories, this is the real sense of the lubricant. An ideal lubricant should be both of the flow aid, anti-sticking and lubrication three roles, the  PVC heat stabilizer for window lubricant in the currently available yet no such ideal lubricant, are often one or two aspects of a relatively good performance, but other effects are relatively poor.
Type of dispersant fatty acids, fatty amides, and esters
Stearamide and used with higher alcohol can improve lubricity and thermal stability, the amount (mass fraction) 0.3% -0.8%, the slip agent may be polyolefin; hexenyl bis hard fat acid amides, also known as ethylene bis-stearamide (EBS), the lubricant is a high melting point, the amount of 0.5% to 2%; glyceryl monostearate (GMS), glyceryl tristearate (HTG); oleic acid 0.2% to 0.5% of the amount; hydrocarbon wax solid, mp 57 ~ 7
0 ℃, insoluble in water, soluble in an  azodicarbonamide organic solvent, the resin dispersibility, compatibility, poor thermal stability, the dosage is generally 0.5% or less paraffinic
Although the wax is external lubricant, but straight-chain non-polar hydrocarbon, not wet the metal surface, such as polyvinyl chloride resin that does not prevent adhesion of metal walls, only, and stearic acid, calcium stearate and used, in order to achieve synergy
(Nujol): Freezing Point -15 ¯ -35 ℃, the extrusion and injection molding processing, the compatibility with the resin
Poor, the amount added is generally 0.3% to 0.5%, too much time, but the processing performance deterioration
Microcrystalline wax: the petroleum refining process has been its relative molecular mass is large, and  there are many isomers, melting
Point 65-90 ℃, lubricity and thermal stability, but poor dispersion, the dosage is generally 0.1% to 0.2%, preferably butyl stearate, higher fatty acid and used
Metal soaps
Metal salts of higher fatty acids, called metal soaps such as barium stearate (BaSt) for a variety of plastics, an amount of about 0.5%; zinc stearate (ZnSt) for polyolefins, ABS, etc., the  Glycerol monostearate amount of was 0.3%; calcium stearate (CaSt) suitable for GE Plastics, external lubrication, the amount of 0.2% ¯ 1.5%; Other stearic acid soaps such as cadmium stearate (CdSt), stearic acid Magnesium (MgSt), copper stearate (CuSt) low molecular weight waxes
Based on a variety of low molecular weight polyethylene wax (homopolymer or copolymer), polypropylene, polystyrene or other polymer modified as raw material, by pyrolysis, oxidation from a range of performance of different oligomers
Its main products are: homopolymer, oxidized homopolymer, ethylene - acrylic acid copolymer, ethylene - vinyl acetate copolymer
Materials, low molecular weight ionomers five categories. Among the most commonly used polyethylene wax
Commonly used polyethylene wax average relative molecular mass of 1500-4000, the softening point of 102 ℃; Other specifications of polyethylene wax average relative molecular mass of 10,000 to 20,000, a softening point of 106 ℃; oxidized polyethylene wax of long-chain molecules with a certain amount of ester group or a soap, and thus the PVC, PE, PP, ABS and external lubrication more balanced, better, its transparency is good. As dispersing agent and its environment, many practical applications, selection of the appropriate dispersing agent is very important.