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In this article, the Qingdao Sainuo polyethylene wax manufacturer takes you to understand the extension effect of lubrication in the processing of PVC products, the first article we first to understand the first four points, the next article we will understand the last four points.
1. Inhibit material degradation
PVC has a large friction heat generation characteristics of materials, materials in the processing of local overheating and degradation and lead to degradation of materials as a whole. In fact, lubricants can reduce material friction heat, so lubricants have to inhibit the degradation of PVC materials in the thermoplastic process, also known as mechanochemical stabilizer.
2. Modulating resin plasticizing
In plastic thermoplastic processing, the heat required for resin plasticizing comes from the conduction from the cylinder wall and the surface of the screw and the friction of the material during the feeding and compression stages.
3. Changing the melt flow behavior
The flow behavior of melt can be changed by PVC lubricant through the action of internal and External Lubricant. The internal lubrication reduced the melt viscosity but did not affect the adhesion to the metal surface. Obviously, the stronger the internal lubrication, the higher the melt flow rate. The external lubrication reduces the adhesion of the melt to the metal surface but does not affect its viscosity, so the melt advances at the same speed.
4. Eliminate Melt Rupture
Polymer melt fracture is a flow instability phenomenon of elastic polymer melt due to adhesion and sliding alternation under high shear stress. The basic lubricating effect of PVC lubricant is to reduce the melt viscosity, elasticity and the adhesion of the melt to the metal surface of processing equipment. Therefore, the rational use of lubricants can eliminate PVC melt cracking.
Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer for PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS, Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing.
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