Manufacturing Method of PVC Resin
PVC resin is a widely used raw material for the production of chemicals, and due to its unique physical and chemical properties, it is widely used in building materials, wires and cables, packaging materials, medical devices and other fields. This article will introduce the manufacturing method of PVC resin in detail.
I. Raw material preparation
The main raw material for manufacturing PVC resin is vinyl chloride monomer (VCM). VCM can be produced by the addition reaction of acetylene and hydrogen chloride. In the production process, it is also necessary to add initiators, dispersants, stabilizers and other additives.
II, polymerization reaction
PVC resin manufacturing process is mainly through the polymerization reaction of vinyl chloride monomer into polymer. Polymerization reaction can be carried out in a variety of ways such as solution polymerization, suspension polymerization and emulsion polymerization. Among them, suspension polymerization is the commonly used production method.
Suspension polymerization is to add raw materials such as vinyl chloride monomer, water, dispersant and initiator together into the polymerization kettle, and make the monomer form small droplets in water by stirring and aeration, and carry out the polymerization reaction under the action of initiator. During the polymerization process, the temperature and pressure need to be controlled to maintain the stability of the reaction. After the polymerization is completed, the PVC resin slurry obtained will be dehydrated, dried and other treatments, to obtain the powdered PVC resin.
Three, post-treatment
The manufactured PVC resin also needs to be post-treated to improve its thermal stability and processing performance. Commonly used post-treatment methods include adding heat stabilizers and processing aids. Heat stabilizers can prevent PVC resin from thermal decomposition during processing and use, while processing aids can improve the processing fluidity of the resin.
Four, quality control
In order to ensure the quality of PVC resin, it is necessary to carry out strict quality control. Including the quality testing of raw materials, polymerization reaction conditions control, product performance testing and other aspects. Only through strict quality control can we ensure that the PVC resin produced meets the relevant standards and requirements.
In short, the manufacturing method of PVC resin needs to be controlled and processed through several links to ensure the quality and performance of the product. With the continuous progress and application of science and technology, the manufacturing technology of PVC resin is also improving, which provides better guarantee for the application in various fields.
