PVC Basics

Today, the small class of ZHONGSHAN LINYANG PLASTIC CO.LTD will come to tell you about the basic knowledge of PVC and the classification of polyvinyl chloride. Polyvinyl chloride (Polyvinyl Chloride, PVC for short) is the first in my country and the second largest general-purpose synthetic resin material in the world. Due to its excellent flame retardancy, wear resistance, chemical resistance, comprehensive mechanical properties, product transparency, At present, PVC has become one of the most widely used plastic varieties, and is widely used in industry, construction, agriculture, daily life, packaging, electricity, public utilities and other fields. Ethylene (PE), polypropylene (PP), polystyrene (PS) and ABS are collectively referred to as the five general-purpose resins. Classification of polyvinyl chloride According to different applications, PVC can be divided into: general-purpose PVC resin, high degree of polymerization PVC resin, cross-linked PVC resin. Universal PVC resin is formed by the polymerization of vinyl chloride monomer under the action of an initiator; high degree of polymerization PVC resin refers to a resin polymerized by adding a chain extender to the vinyl chloride monomer polymerization system; cross-linked PVC resin is A resin obtained by adding a crosslinking agent containing diene and polyene to the vinyl chloride monomer polymerization system. Due to the simple preparation method and wide range of uses of general-purpose PVC, most of the general-purpose PVC resins circulating in the spot market are general-purpose PVC resins, while high-degree-of-polymerization and cross-linked PVC resins are generally used in special fields. . According to the method of obtaining vinyl chloride monomer, it can be divided into calcium carbide method, ethylene method and imported (EDC, VCM) monomer method (ethene method and imported monomer method are commonly referred to as ethylene method). At present, most of the world is ethylene-based PVC, while my country is mainly based on calcium carbide-based PVC. According to the polymerization method of vinyl chloride monomer, the acquisition of polyvinyl chloride can be divided into suspension method, emulsion method, bulk method and solution method. Suspension method is the main production method of PVC because of its simple production process, easy control and large-scale production, and strong product suitability. Worldwide, the production volume of suspension method PVC accounts for about 80% of the total. The bulk method does not need water and dispersants, the post-polymerization treatment is simple, and the product purity is high, but there are problems of stirring and heat transfer in the polymerization process, and the production cost is high. It belongs to the elimination process, and its production capacity is less than 10% of the total. my country At present, only Sichuan Yibin Tianyuan adopts the ontology method to produce PVC. In the emulsion polymerization, water is used as the dispersion medium, and the particles obtained are relatively fine, with poor thermal stability and electrical insulation. It is suitable for the production of paste resin. It is mainly used for the manufacture of artificial leather, impregnated gloves, screen windows, paddy field boots, tool handles, For wallpapers, floor rolls, battery separators and toys, etc., the output of PVC paste resin in my country is less than 4% of the total output of PVC. Solution polymerization is only used to produce coatings or specialty products. In the United States, the proportion of resin produced using various polymerization methods is: 87.8% for suspension, 6.4% for emulsion and microsuspension, 4.4% for bulk polymerization, and 1.4% for solution. In my country, more than 90% of PVC is produced by the suspension method. Founded in 2003, Zhongshan ZHONGSHAN LINYANG PLASTIC CO.LTD Decoration Materials Co., Ltd. is a modern enterprise specializing in the production, sales and service of PVC blister film for cabinets. The company covers an area of u200bu200b20,000 square meters and has an existing asset of 200 million yuan. It is the largest PVC sales company in the Central Plains region. At the same time, small batch delivery and 24-hour fastest delivery service are provided.