1. Chlorine content
Range and performance relationship: The chlorine content of CPE is usually 25% -45%. When the chlorine content is ≥ 35%, it has self extinguishing properties (LOI ≥ 28%), and when it exceeds 40%, the flame retardancy is significantly improved.
Low temperature performance: When the chlorine content is 30% -40%, the material still maintains flexibility at -30 ℃.
2. Chlorination process
Chlorine atom distribution: CPE prepared by solution method, suspension method or sulfurization method, the uniformity of chlorine atom distribution affects its compatibility and mechanical properties.
Microstructure: The degree of chlorination affects the glass transition temperature (Tg) of CPE, and the low-temperature performance needs to be evaluated through dynamic thermomechanical analysis.
3. Blending modification
PVC toughening: Blending CPE with PVC (5-15 parts added) can increase impact strength by 3-5 times and enhance weather resistance.
Flame retardant synergy: Compound with magnesium hydroxide (Mg (OH) ₂) can reduce combustion smoke density and improve thermal stability.
4. Sulfurization system
Crosslinking density: Peroxides (such as DCP) or thiourea vulcanizing agents can optimize the cross-linking structure of CPE, improve oil resistance and mechanical strength.
5. Filling and processing
Inorganic fillers: Adding carbon black or titanium dioxide can adjust conductivity and coloring properties, but excessive filling may reduce ductility.
Processing temperature: The decomposition temperature of CPE is relatively high, but high temperature should be avoided from causing HCl catalytic dechlorination reaction.
6. Application adaptability
Special rubber: CPE with a chlorine content of 25% -35% is suitable for flame-retardant scenarios such as cable sheaths.
ABS modification: C-type and AZ type CPE developed by Bontecn Group China can enhance the flame retardancy and anti drip properties of ABS, reducing the amount of flame retardants used
Post time: Sep-05-2025
