Difference between chlorinated polyethylene and chlorine mystery

In the chemical industry, the choice of materials is critical to the performance and safety of products. Chlorinated polyethylene (PX-E, abbreviated as PEX) and chlorine enigma (polyvinyl chloride, PVC) are two common thermoplastics that are often used as materials for water supply and drainage systems, but they have chemical structures, physical properties and There are significant differences in application areas. This article will analyze the differences between these two materials in detail and discuss their advantages and disadvantages in industrial applications.

1. Definitions and Overview

1.1 chlorinated polyethylene (PEX) Definition

Chlorinated polyethylene (PX-E) is a thermoplastic in the polyethylene series, and its molecular structure is formed by the addition polymerization reaction of ethylene monomer. The chemical name of the PX-E is 1,4-dichlorobutadiene (1,4-dichlorobutenedioic acid), and its name comes from the position of the two double bonds in its monomer structure.

Because of its excellent chemical stability and corrosion resistance, PX-E are widely used in water supply and drainage systems, especially in acid, alkali and chemical environment. Due to its excellent thermal stability, the use of PX-E in high temperature environments is also more common.

1.2 Chlorine Puzzle (PVC) Definition

Chlorine enigma, or polyvinyl chloride (PVC), is the product of the reaction of ethylene monomer with chlorination. In its molecular structure, double bonds are located on both sides of the central carbon atom, resulting in more double bonds in its molecular structure.

PVC is widely used in the production of pipes, films, chemical fibers and other fields because of its good processability and chemical resistance. Its thermal stability is not as good as PX-E, and it is easy to decompose or release harmful substances at high temperature.

2. Chemical structure comparison

2.1 Molecular Structure Differences

The molecular structures of PX-E and PVC differ significantly in the position of the double bonds. The double bonds of PX-E are located at both ends of the molecular structure, while the double bonds of PVC are located in the center of the molecular structure. This difference has an important impact on the physical and chemical properties of the two materials.

2.2 chemical reaction stability

The double bond structure of PX-E makes it show higher thermal stability at high temperature, so that it is not easy to decompose in high temperature chemical reaction. The double bond structure of PVC makes it more prone to degradation at high temperatures.

3. Physical Performance Comparison

3.1 thermodynamic properties

The melting point of PX-E is higher, usually between 200-250°C, while the melting point of PVC is lower, usually between 130-140°C. This difference makes the use of PX-E in high temperature environments more common.

3.2 thermodynamic stability

PX-E has high stability in chemical reactions and can withstand strong acids, alkalis and other chemical environments. PVC is easily decomposed in chemical reactions and releases harmful substances, which limits its use in chemical environments.

4. Purpose and application field

4.1 chlorinated polyethylene (PEX) application

Because of its excellent chemical stability, PX-E is widely used in water supply and drainage system. Its excellent corrosion resistance and thermal stability make it perform well in acid, alkali and chemical environments. PX-E are also used in the production of high-temperature pipes, chemical containers, etc.

4

PVC has a wide range of applications, mainly in the field of industrial materials and packaging materials. PVC is used to make pipes, films, chemical fibers, etc. Its good processability and chemical resistance make it important in these fields. Its use in high temperature environment is limited, easy to decompose.

5. Selection and application recommendations

In practical applications, the choice of PX-E or PVC depends on specific application scenarios and performance requirements. PX-E in high temperature and chemical environment is more excellent, suitable for acid, alkali and chemical environment of water supply, drainage system. PVC is more common in the field of industrial materials and packaging materials, and its excellent processability and chemical resistance make it an important position in these fields.

Conclusion

Chlorinated polyethylene (PX-E) and chlorinated polyethylene (PVC) have significant differences in chemical structure, thermodynamic properties and application areas. PX-E is an ideal material for water supply and drainage systems due to its excellent chemical stability, high temperature performance and corrosion resistance. PVC has become an important choice for industrial materials and packaging materials due to its good processing performance and wide range of industrial applications. When selecting materials, reasonable choices should be made according to specific application requirements and performance requirements.