Polyvinyl chloride cas 9002-86-2

Polyvinyl chloride cas 9002-86-2

Polyvinyl chloride (PVC) resin, with the chemical formula (CH2-CHCL)n, is an important organic synthetic material. It has good physical and chemical properties, so it is widely used in industry, construction, agriculture, daily necessities, packaging, electricity and public utilities.

The physical appearance of PVC resin is white powder, non-toxic and odorless. Its relative density is between 1.35-1.46, and its refractive index is 1.544 (20°C). This resin is insoluble in water, gasoline, alcohol and vinyl chloride, but can be dissolved in solvents such as acetone, dichloroethane, and xylene. It has very high chemical stability and excellent plasticity. Except for a few organic solvents, it can resist any concentration of hydrochloric acid, sulfuric acid below 90%, nitric acid below 50-60%, and caustic soda below 20% at room temperature. In addition, it is also quite stable to salts. When PVC burns on a flame, it releases hydrogen chloride (HCl), but it will extinguish itself when it leaves the flame, so it is a "self-extinguishing" and "flame-retardant" substance. When the temperature of PVC exceeds 100℃, it begins to decompose and slowly release HCl. As the temperature rises, the rate of decomposition and release of HCl will accelerate, causing the PVC to change color.

PVC is synthesized from vinyl chloride through free radical polymerization. According to different production methods, PVC pure powder can be divided into general-purpose PVC resin, high-polymerization PVC resin and cross-linked PVC resin. General-purpose PVC resin is formed by the polymerization of vinyl chloride monomer under the action of initiator; high-polymerization PVC resin is polymerized by adding chain extender to the polymerization system of vinyl chloride monomer; cross-linked PVC resin is polymerized by adding cross-linking agent containing diene and polyene to the polymerization system of vinyl chloride monomer.

PVC resin can be processed into various plastic products, including two categories of soft and hard products. These products are mainly used to produce transparent sheets, pipes, gold cards, blood transfusion equipment, soft and hard pipes, plates, doors and windows, profiles, films, electrical insulation materials, cable sheaths and blood transfusion materials.

Polyvinyl chloride resin (PVC) is a versatile plastic material with a wide range of applications, ranging from architecture and construction to medical and consumer products. The following is a detailed account of the development of PVC applications:

1. Building and construction:

Pipes and fittings: PVC is widely used in the production of various types of pipes and fittings, including drain pipes, cable sheathing, ventilation systems, etc.

Windows and doors: PVC is the main material for manufacturing energy-saving windows and doors, and has good thermal insulation properties.

Flooring: PVC flooring is favored for its durability, easy cleaning and cost-effectiveness.

Exterior wall cladding: PVC is also used to manufacture exterior wall cladding materials, providing weather resistance and aesthetics.

2. Consumer goods:

Household goods: including kitchen supplies, bathroom accessories, decorative materials, etc.Packaging materials: PVC is used to manufacture food packaging films, bottles and other packaging containers.Clothing and footwear: PVC is used to manufacture raincoats, rain boots and other waterproof products.

3. Medical supplies:
PVC has a wide range of applications in the medical field, including infusion tubes, blood bags, packaging materials for medical devices, etc.

4. Electronics and electrical:
Due to the electrical insulation properties of PVC, it is used as an insulation layer and sheath material for wires and cables.

5. Automotive industry: PVC is used for automotive interiors, seat coverings, wire insulation, and chassis protective coatings.

6. Agriculture: PVC film is used for greenhouse coverings to provide insulation and moisture retention.

7. Alternative materials: With the advancement of technology, PVC composite materials have begun to replace traditional materials such as wood and metal for furniture, railings, roofs, etc.

8. Environmental protection and sustainability: With the increasing awareness of environmental protection, the PVC industry is working hard to develop more environmentally friendly products, such as using non-toxic or low-toxic plasticizers, and recycling and reusing PVC materials.

9. Technological progress: PVC processing and application technology continues to advance, such as by adding different additives to improve its performance to meet the needs of specific applications.

10. Market dynamics: Global demand for PVC continues to grow, especially in Asia, where China is the largest PVC consumer.

11. Regulations and standards: With the increase in health and safety concerns, governments are also strengthening their supervision of PVC products, such as restricting the use of certain hazardous substances to ensure product safety and environmental protection.