Chlorinated Polyvinyl Chloride
Chlorinated polyvinyl chloride (CPVC) is a product of further chlorination modification of polyvinyl chloride (PVC), and its chlorine content is generally 65% ~ 72% (volume fraction). In addition to many excellent properties of PVC, CPVC has much better corrosion resistance, heat resistance, solubility, flame retardancy, mechanical strength, etc. than PVC. Therefore, CPVC is a new material with excellent performance and is widely used in construction, chemical industry, metallurgy, shipbuilding, electrical appliances, textiles and other fields, with a very broad application prospect.
Properties
Chlorinated polyvinyl chloride is a new type of engineering plastic made by chlorination modification of polyvinyl chloride (PVC) resin. The product is white or light yellow, tasteless, odorless, non-toxic loose particles or powder. After chlorination of PVC resin, the irregularity of molecular chain arrangement increases, polarity increases, the solubility of the resin increases, and the chemical stability increases, thereby improving the material’s heat resistance and corrosion resistance to acids, alkalis, salts, oxidants, etc.
Uses
CPVC has excellent high temperature resistance, corrosion resistance and flame retardancy, and its price is relatively low compared with other thermoplastic engineering plastics. Therefore, CPVC has a wide range of uses, and is widely used in hot and cold water transportation in residences, hotels, and restaurants, as well as industrial pipeline water supply systems; cable tubes, special-shaped doors and windows, and other building materials; decorative materials in aircraft, and materials for cars and lamps; CPVC sheets can be welded into different equipment; in addition, it is also widely used in the electronics industry.
Effective recycling methods for chlorinated polyethylene plastics
Physical recycling methods
Physical recycling refers to the physical classification, cleaning, crushing and melting of waste chlorinated polyethylene plastics to restore them to reusable plastic raw materials. This method is relatively simple and low-cost, and mainly includes the following steps:
A. Classification: Classify the collected waste chlorinated polyethylene plastics according to type and quality for subsequent treatment.
B. Cleaning: Remove oil, dirt and other impurities on the surface of the plastic to ensure its purity.
C. Crushing: Crushing the cleaned plastic into small pieces or granules for easy melting and processing.
D. Melting: Melting the crushed plastic at high temperature to form a plastic plastic melt.
E. Plasticization: Cooling and hardening the molten plastic to obtain reusable plastic raw materials.
Chemical recycling methods
Chemical recycling refers to the decomposition of waste chlorinated polyethylene plastics into small molecular compounds or monomers by chemical methods, and then further synthesizing new plastic materials. This method can achieve efficient utilization and recycling of plastics, mainly including the following technologies:
A. Pyrolysis technology: In a high-temperature oxygen-free or low-oxygen environment, waste chlorinated polyethylene plastics are decomposed into gas, liquid and solid products. Among them, gas and liquid products can be used as fuel or chemical raw materials, and solid products can be further processed to obtain valuable chemicals.
B. Solvent decomposition technology: Use specific solvents to decompose waste chlorinated polyethylene plastics to obtain monomers or small molecule compounds. These monomers or small molecule compounds can be used as raw materials to synthesize new plastic materials or other chemicals.
C. Biodegradation technology: Use microorganisms or enzymes to decompose waste chlorinated polyethylene plastics into degradable small molecules. This technology has the advantages of environmental protection and sustainability, but it is still in the research and experimental stage.
