Principle one

注意配方中润滑的内外平衡，适应前期、中期和后期各阶段对物料润滑性的要求，达到润滑平衡的一致性和长期性。

Pay attention to the internal and external balance of the lubrication in the formula, and meet the requirements of the material lubrication in the early, middle and later stages, so as to achieve the consistency and long term of the lubrication balance.

外润滑剂过多，挤出速度快，物料易生、塑化不好。内润滑剂多，挤出量大，物料塑化虽好，但初期润滑效果不好挤出扭矩偏大。

Too many external lubricants, fast extrusion speed, easy to produce and plasticized materials. There are many lubricants, large extrusion capacity and good plasticization, but the initial lubrication effect is not good, and the extrusion torque is too large.

当后期润滑不足，则会导致螺杆均化段、压缩段、口模段润滑不足，物料剪切剧烈，影响型材的表面质量及内在性能，严重时还会造成分解。

When the late lubrication is insufficient, the lubrication of the screw homogenization section, the compression section and the die section will be insufficient, and the material shearing is intense, which affects the surface quality and internal performance of the profile, and will cause decomposition when it is serious.

一般将润滑剂的熔点和加工温度结合来判定润滑剂在配方中初期、中期和后期的润滑性。

In general, the melting point and processing temperature of lubricant are combined to determine the lubricity of lubricants in the initial, middle and late stages.

原则二

Principle two

在满足需要的前提下，润滑剂应维持最小用量。

Lubricants should be kept at a minimum dosage on the premise of meeting the needs.

虽然润滑剂在配方中具有重要作用，但不是用量越多越好。润滑内外平衡，是在一定限度内的平衡。由于润滑剂与PVC树脂相容性有限，过多加入会对PVC体系产生不良影响。许多加工及热稳定性问题，都有可能是润滑剂过量造成的。

Although lubricants play an important role in the formulation, the more the dosage is, the better. Lubrication of internal and external balance is a balance within a certain limit. Due to the limited compatibility between lubricants and PVC resins, excessive addition will have adverse effects on the PVC system. Many processing and thermal stability problems may be caused by excessive lubricant.

原则三

Principle three

选用润滑荆要注意配方中稳定剂、加工助剂、改性剂、填料等对润滑作用的影响。

The effect of stabilizers, processing aids, modifiers and fillers on lubrication should be paid attention to.

润滑体系的平衡，不是润滑剂之问的简单平衡，而是整个配方体系的润滑平衡。不同稳定体系的配方对润滑剂的要求不同，润滑剂在配方中发挥的润滑作用也不相同。

The balance of lubrication system is not the simple balance of lubricants, but the lubrication balance of the whole formulation system. The formulation of different stabilizer systems has different requirements for lubricants, and lubricants play different lubricating effects in formulations.

例如，在铅盐稳定剂体系中，润滑剂的极性越大，与PVC相容性越好，而在有机锡稳定体系中则变化不大。这是由于有机锡本身具有增塑作用。稀土稳定剂因其稀土元索的特殊结构，与润滑剂的协同效应更明显，易使PVC凝胶，可减少塑化时间，提高熔体流动性。

For example, in the lead salt stabilizer system, the greater the polarity of lubricants, the better compatibility with PVC, but little change in organotin stabilized system. This is due to the plasticizing effect of organotin itself. Because of the special structure of rare-earth stabilizer, the synergistic effect of the rare earth element cable with the lubricant is more obvious. It is easy to make the PVC gel easy to reduce the plasticizing time and improve the melt fluidity.