如何才能选用到好的、合适的润滑剂，首先要对润滑剂的基础概念和理论有个大致和正确的认识和了解。如果对基本概念和理论有大的认识偏差，要想选用到好的、对的润滑剂可能会比较难，或者会花出更多的时间去试验验证和实践。在此，先简单的介绍下润滑剂的基本概念和理论：
First, we must have a general and correct understanding and understanding of the basic concepts and theories of lubricants. If there is a large understanding of the basic concepts and theories, it may be difficult to choose a good, correct lubricant, or it will take more time to test and practice. Here, I will briefly introduce the basic concepts and theories of lubricants.
1、外滑剂
1, external slide agent
润滑剂熔融后，在螺筒、模具、螺型槽模具 一次性止血带 保定水处理设备 一次性止血带 保定空压机 北京真空泵杆等表面 与PVC熔体表面之间形成一层膜，起到润滑作用的物质我们称之为外滑剂。外滑剂在PVC加工生产中中有以下的表现和特征：
After the lubricant is melted, a layer of film is formed between the surface of the cylinder, mold and screw, such as the surface of the PVC melt, and the lubricant is called the outer lubricant. The external slip agent has the following characteristics and characteristics in PVC processing and productio