The main performance lubricants commonly used PVC

Common PVC lubricants [2] The main properties are as follows: calcium (1) stearic acid:
White powder, mp 148-155 ℃, non-toxic, have excellent lubricity and workability, no sulfide contamination with lead and basic lead salt soap and use, can increase the rate of gelation, the dosage is generally 0.1-0.4PHR.
(2) polyethylene wax
White or light yellow powder or granules contain small amounts of oxidized polyethylene wax, although polar group is still compatible with the PVC, but the higher the efficiency of the lubrication can be improved lubricity between the polymer and the metal, improving the WSD PVC lubricants  extrusion efficiency, improve a colorant dispersion, gives the product a good transparency and gloss. The amount of 0.1-0.5PHR.
(3) stearate
White or light yellow granules, mp 70-71 ℃. Slow evaporation at 90-100 ℃, as external lubricant in PVC processing hardware, the amount is usually 0.2-0.5PHR, and have the effect of preventing scale chromatography, but easy to use excessive blooming.
(4) Glyceryl stearate
Powder substance, melting point 85-87 ℃, has excellent heat resistance and flowability, increase the amount of filler, may contribute to the plasticizing. And waxes and use, to improve the thermal stability of PVC-U. General amount of 0.2-0.6PHR.
In practice it was found that when two or more with the use of the lubricant, when used alone with the emergence of WSD Titanium dioxide rutile  a different effect. In profile formulations, the way they use complex
(5) Paraffin
Melting point 57-63 ℃, no polar group, is a typical external lubricant. Because of its low melting point, easy to evaporate, a small melt viscosity, only within a narrow range from lubrication, suitable for single, twin-screw extruder, the general amount of 0.1-0.8PHR. This product is poor transparency, easy to whiten.
(6) Polyethylene wax
White powder, a softening point of about 100-117 ℃, due to its relatively large molecular weight, high melting  WSD Stabilizers for pipe point, low volatility and therefore at a higher temperature and shear rate, also showed significant lubricating effect. For hard PVC single, twin-screw extruder, the usual dose is 0.1-0.5PHR.