Хлорированный полиэтилен

Description

Chlorinated polyethylene (CPE) is a product of post-polymerization chlorination of polyethylene, during which some of the hydrogen atoms in the polymer chain are replaced by chlorine. As a result, the regular crystalline structure of the original polyethylene is partially destroyed, the material acquires elastomeric properties and becomes a thermoplastic elastomer or rubber-like polymer, depending on the degree of chlorination.

Basic Attributes

• CAS No: 64754-90-1
• English name: Chlorinated polyethylene
• Section: Polymers

Physico-chemical characteristics

• Appearance: Off-white, granular

Safety Information

• RTECS number: KM6893750

Scope of application

The main application is an impact resistance modifier for polyvinyl chloride (PVC): the introduction of CPE into the PVC formulation increases the frost resistance and resistance of products to impact loads without significant loss of transparency and mechanical strength. As an independent polymer, chlorinated polyethylene is used in the production of cable insulation and wire sheaths, flexible hoses, roofing membranes, rubber products resistant to oils, ozone and weathering - that is, where properties similar to chloroprene rubber are required, but at a lower cost of raw materials.

Features and Benefits

Compared to untreated polyethylene, chlorinated material has increased chemical resistance to oils, fuels and most solvents, better fire resistance due to the chlorine content, and increased resistance to ozone and ultraviolet aging. The degree of chlorination of a technical product determines the balance between elasticity and heat resistance of the finished product.

Production and brand assortment

Chlorinated polyethylene is produced by radical chlorination of polyethylene in an aqueous suspension or in an organic solvent solution, usually with a combined chlorine content of 25 to 42% by weight. Grades with a lower chlorine content retain some of the crystallinity of polyethylene and are closer in behavior to thermoplastics; grades with a high chlorine content are practically amorphous and behave like elastomers, requiring vulcanization to obtain rubber-like products. The technological process includes the stages of grinding the original polyethylene, chlorination, washing from residual acid and drying the granules. Before shipment, the finished granulate is checked for bound chlorine content and residual moisture, since these parameters directly affect the uniformity of material processing by the consumer.

Storage and handling

Store in granular form in a dry place, protected from direct sunlight and heat sources, in closed containers or bags that prevent caking and contamination of the granules. The manufacturer does not provide specific data on toxicity and transport codes for this batch; When processing the material (extrusion, casting, rolling), general measures are taken to protect the respiratory system from thermal decomposition of chlorine-containing polymers with the release of hydrogen chloride, and equipment is selected that is resistant to the weak corrosive activity of thermal destruction products.