What should be noted when extruding chlorinated polyethylene materials

Many people are unfamiliar with the product of chlorinated polyethylene, as the name suggests, most people can only recognize that it is a chemical material. It has a process called extrusion molding, which is still quite important in the production process. So what we need to know today is what to pay attention to during the extrusion molding process of this product? Chlorinated polyethylene CPE

1. Attention should be paid to the selection of stabilizers and other processing aids in the raw material formula of formed pipes, with a focus on enhancing and improving melt flowability and improving raw material thermal stability. If necessary, the formula can be mixed first, a small sample can be taken for testing, and placed in a 230 ℃ supply box for 2 hours. If there is no obvious discoloration or decomposition phenomenon, it indicates that the selection of auxiliary materials is reasonable.

2. The extrusion molding process temperature of chlorinated polyvinyl chloride material is slightly higher than that of PVC pipe. However, it should be noted that temperature control fluctuations should not exceed ± 5 ℃.

3. In the process of producing CPVC pipes, if there is a power outage, equipment failure, signs of possible decomposition of the melt, or smoke coming out of the mold mouth, the supply of material to the barrel should be immediately stopped. PVC resin should be used to remove the CPVC melt from the barrel and mold, and then the machine should be stopped to troubleshoot.

4. Before the resin is put into production, it must be dried in an 80 ℃ supply box for 2-4 hours. If necessary, the high-speed mixed raw materials should also be sieved once through a 40 mesh sieve before being put into the extruder hopper for production.

5. The HCl gas released during the decomposition of CPVC melt is harmful to human health, and attention should be paid to ventilation in the production workshop.

6. The extruder barrel, screw, and molten material flow surface in the molding die used for producing CPVC resin should be treated with anti-corrosion to extend the service life of equipment parts.

In the actual production process, the extrusion molding process of chlorinated polyvinyl chloride is still quite difficult. Of course, when using it in certain situations, it is important to choose the appropriate product, and we need to carefully consider how much dosage to choose in order to make more effective use of it.