1) 流动性

1) liquidity

润滑剂对PVC的熔融和流动性有显著影响。充分扩散的外润滑剂覆盖在树脂粒子表面，使摩擦热减少，以物理作用推迟粒子的聚结和熔化，阻碍大分子链短链段的相互扩散。充分分散的内润滑剂起假增塑的作用，促进聚合物熔化。合理的润滑体系是调控PVC塑化速率的最有效、最常用的方法。外润滑剂通过减少对金属表面的点附性及摩擦力，延长塑化时间。内润滑剂在高温下削弱了PVC分子间的内聚力，促进熔化，增加流动性。

The lubricant has a significant effect on the melting and fluidity of PVC. The fully diffused outer lubricant is covered on the surface of resin particles, which reduces the friction heat and delays the coalescence and melting of particles, hindering the diffusion of short segments of macromolecular chains. Fully dispersed internal lubricants play the role of false plasticizing and promote the melting of polymers. The rational lubrication system is the most effective and commonly used method to regulate the plasticizing rate of PVC. The external lubricant prolongs the plasticizing time by reducing the point attachment and friction to the metal surface. The internal lubricant weakens the cohesive force between the PVC molecules at high temperature, promotes melting and increases the fluidity.

2) 热稳定性

2) thermal stability

润滑剂能降低加工时的料温，促进物料稳定，如金属皂润滑剂本身就是热稳剂；甘油单酯是热稳定剂的螯合剂；另一些润滑剂与稳定剂产生协同效应。

Lubricants can reduce material temperature and material stability during processing, such as metal soap lubricant itself is heat stabilizer, glycerol monoester is heat stabilizer chelator, other lubricants and stabilizer synergy effect.

3) 干混料的物性

3) physical properties of dry mixture

润滑剂能影响PVC高速混合时的压实程度及最终的表观密度和凝胶化程度，用双螺杆挤出时尤其如此，挤出量与干混料的表观密度成正比，同时部分凝胶化的粒料在熔融挤出中所需的能量较少，因而挤出量高。

Lubricants can density and gelation degree of compaction degree and the effect of PVC high speed mixing end of the table, especially with the double screw extrusion, extrusion amount and dry mixing apparent density is proportional to the time of gelation in the aggregate part required for melting extrusion less energy, and high output.

4) 力学性能

4) mechanical properties

润滑剂能影响拉伸强度、断裂伸长率和冲击强度等。润滑剂对PVC - U 型材力学性能的影响主要是焊角强度和低温冲击性能。塑化程度越好，低温抗冲击强度越高。在充分保证物料塑化的前提下，润滑剂增加，焊角强度有减小的趋势。当外润滑剂过量时，焊角强度较差，低温落锤冲击强度较好。外润滑剂不足时，焊角强度较好而低温落锤冲击强度较差。

The lubricant can affect the tensile strength, the elongation at break and the impact strength, etc. The influence of lubricants on the mechanical properties of PVC - U profiles is mainly the strength of the welding angle and the low temperature impact. The better the plasticizing degree, the higher the impact strength at low temperature. When the material plasticizing is guaranteed, the lubricant increases and the strength of the welding angle decreases. When the external lubricant overdose, the strength of the welding angle is poor and the impact strength of low temperature drop hammer is better. When the external lubricant is insufficient, the strength of the welding angle is good and the impact strength of low temperature drop hammer is poor.

5) 热变形温度

5) thermal deformation temperature

润滑剂熔点一般较低，某些润滑剂在常温下是液体，在加工时与PVC复合，使其玻璃化转变温度及热变形温度降低。

The melting point of lubricants is generally low. Some lubricants are liquid at room temperature. When combined with PVC, the glass transition temperature and thermal deformation temperature decrease.