Overview
Chlorinated rubber is produced by chlorinating natural or synthetic rubber, resulting in a thermoplastic polymer with enhanced chemical resistance. First commercialized in the 1930s, it became a staple in protective coatings due to its durability against water, acids, and alkalis. The material's molecular structure includes chlorine atoms attached to the rubber hydrocarbon chain, which disrupts crystallization and improves solubility in organic solvents. This modification also increases flame retardancy and weatherability, making it suitable for harsh environments.
Physical and Chemical Properties
As a white-to-yellowish solid, chlorinated rubber is odorless and non-conductive. Its density (1.5–1.7 g/cm³) varies with chlorine content. The material softens at 100–110°C but decomposes above 120°C, releasing hydrogen chloride gas. Key chemical properties include resistance to oxidizing agents, dilute acids, and alkalis. It forms flexible films when dissolved in solvents like xylene or toluene. However, prolonged UV exposure may cause degradation, often mitigated by adding stabilizers in commercial formulations.
Main Applications
Over 70% of chlorinated rubber is used in industrial coatings, particularly for marine vessels, swimming pools, and chemical storage tanks. Its waterproof nature makes it ideal for masonry paints in humid climates. In adhesives, it enhances bonding strength for rubber-to-metal applications. Other uses include traffic-marking paints (due to fast drying), printing inks for plastics, and as a modifier in flame-retardant compounds. Recent environmental regulations have reduced some applications in favor of alternatives like acrylics.
Safety and Storage
While stable at room temperature, chlorinated rubber requires precautions against dust inhalation and thermal decomposition. Storage areas should have temperature controls below 30°C and avoid contact with strong oxidizers. Personal protective equipment (PPE) such as N95 masks and chemical goggles are recommended during handling. Spills should be contained with inert absorbents, not water. Waste disposal must follow local regulations for halogenated polymers, typically through licensed incineration facilities.
B2B Procurement Guide
Industrial buyers should specify chlorine content (65–68% optimal for coatings), viscosity (measured in 20% toluene solutions), and residual solvent levels. Bulk purchases (500kg+) often qualify for 5–15% discounts. Verify supplier certifications like ISO 9001 and REACH compliance. Sample testing for film-forming ability and drying time is advised. Major producers are concentrated in China, Germany, and the US, with lead times of 2–6 weeks for international orders. Containerized shipments require moisture-proof packaging.
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