PVC塑料润滑剂的功能是在塑料加工中和制品的脱模性，防止在机内或模具内因粘着而产生缺陷。一般加在模塑料中或涂于模腔表面。常用润滑剂有脂肪酸及其盐类，长链脂肪烃。根据润滑剂作用的机理不同可分为外润滑剂和内润滑剂。

The function of PVC plastic lubricants is to demolish plastic products and products and prevent defects in machine or mold due to adhesion. It is generally added to the mold plastic or coated on the surface of the cavity. Commonly used lubricants include fatty acids and their salts, long chain aliphatic hydrocarbons. According to the mechanism of lubricant action, it can be divided into external lubricants and internal lubricants.

(1)外润滑剂：这种润滑剂与模塑用树脂的相容性较差，因此常用在成型加工机械或模具上，它与树脂之间形成一润滑层，便于树脂流动和制品脱模，如石蜡。

(1) external lubricant: the lubricant is poor in compatibility with the molding resin, so it is often used in molding machines or moulds. It forms a lubricating layer between the resin and the resin to facilitate the flow of resin and the release of products, such as paraffin.

(2)内润滑剂：此类润滑剂与树脂的相容性好，常掺入树脂之中，降低树脂的熔体粘度，改善其流动性。如硬脂酸丁酯、硬脂酸铅等。硬脂酸盐类既是良好的润滑剂，又是有效的稳定剂。

(2) internal lubricants: such lubricants are compatible with resins and are often incorporated into resins to reduce melt viscosity and improve their fluidity. Such as butyl stearate, lead stearate and so on. Stearate is not only a good lubricant, but also an effective stabilizer.

常用PVC润滑剂 主要性能如下：

The main properties of the common PVC lubricants are as follows:

（1）硬脂酸钙：

(1) calcium stearate:

白色粉末，熔点148-155℃，无毒，有优良的润滑性和加工性，无硫化污染，与碱式铅盐和铅皂并用，可提高凝胶化速度，用量一般为0.1-0.4PHR。

White powder, melting point 148-155 C, non-toxic, good lubricity and processing, no vulcanization pollution, with alkaline lead salt and lead soap, can improve the speed of gelation, the dosage is generally 0.1-0.4PHR.

(2)氧化聚乙烯蜡

(2) oxidized polyethylene wax

白色或淡黄色粉末或颗粒，氧化聚乙烯蜡虽含有少量极性基团，仍与PVC不相容，但润滑效率较高，可提高聚合物与金属间的润滑性，提高挤出效率，改善着色剂的分散性，赋予制品良好的透明性和光泽。用量0.1-0.5PHR。

White or yellowish powder or granules, although a small number of polar groups are contained in the oxidized polyethylene wax, it is still incompatible with PVC, but the lubricating efficiency is high, which can improve the lubricating property between the polymer and metal, improve the extrusion efficiency, improve the dispersity of the colorant, and give the products a good transparency and gloss. The dosage is 0.1-0.5PHR.

（3）硬脂酸

(3) stearic acid

白色或微黄色颗粒，熔点70-71℃。在90-100℃下缓慢挥发，在硬PVC加工中作外润滑剂，用量一般为0.2-0.5PHR，并有防止层析结垢的效果，但用量过大易喷霜。

White or yellowish particles with a melting point of 70-71 degrees C. Slowly volatilization at 90-100 C, in hard PVC processing as an external lubricant, the dosage is generally 0.2-0.5PHR, and it has the effect of preventing chromatography from scaling, but the amount is too large and easy to spray frost.