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PVC润滑剂种类及选用方法
一、润滑剂的基础概念
First, the basic concept of lubricants
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 production:
一、提高制品表面光泽度,防止物料粘附在热的金属表面。
First, improve the surface gloss of products and prevent materials from sticking to hot metal surfaces.
二、调整物料塑化点。通过增加外滑剂,可以延迟物料塑化点,推后塑化时间。
Two, adjust the material plasticizing point. By adding the outer slip agent, the plasticizing point can be delayed and the plasticizing time can be pushed back.
三、用的剂量太高,会导致析出现象。外滑剂添加量太大,会造成加工过程中模头析出、定性槽、制品等析出。
Three, the dosage is too high, will lead to precipitation phenomenon. The addition of external slider can cause the mold to precipitate, the groove and the product to precipitate.
四、如果剂量太高,会降低抗冲等机械物理性能。因为外滑剂添加量太高(塑称过滑),将影响物料塑化效果,同时也影响了物料混炼的均匀程度,所以生产的制品将不能得到良好的抗冲等物理机械性能。
Four, if the dosage is too high, it will reduce the mechanical and physical properties such as impact. Because the addition of the outer lubricant is too high (plastic called slip), it will affect the plasticizing effect of the material, and also affect the uniformity of the material mixing, so the product will not get good physical and mechanical properties.
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