1、 Introduction
Chlorinated Polyethylene (CPE) is a polymer material obtained by chlorination modification of the main chain of polyethylene (PE). Its chlorination degree (chlorine content) is usually between 25% and 45%, giving it unique properties between rubber and plastic. CPE combines flexibility, weather resistance, flame retardancy, and chemical stability, making it a core material in fields such as construction, automotive, and wire and cable.
2、 Chemical Structure and Preparation
- Structural characteristics: CPE replaces hydrogen atoms on the PE chain with chlorine atoms, disrupting the original crystalline structure and forming amorphous regions, thereby enhancing elasticity and low temperature resistance.
- Influence of chlorination degree: ● Low chlorine content (25% -35%): Excellent elasticity, suitable for rubber modification.
- Medium to high chlorine content (35% -45%): It combines flexibility and rigidity and is used for flame retardant materials.
Preparation process:
- Solution method: Chlorination in a solvent results in high purity of the product, but it is costly and suitable for laboratory use.
- Suspension method: Using water as the medium, it is a mainstream industrial method with low cost, but it requires controlling the uniformity of chlorine distribution.
- Solid phase method: Directly chlorinating PE powder, environmentally friendly but technically difficult, suitable for special CPE.
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