1、 Enhance toughness and impact resistance
Enhancing toughness: CPE, as an elastomer, improves the brittleness of PVC matrix through physical blending, significantly enhancing the impact strength of composite materials. Experiments have shown that adding 10 parts of CPE can increase the impact strength of foamed PVC wood plastic composites by 20%. Bontecn Group China’s wood plastic special CPE can significantly improve product toughness and reduce production costs. Welcome to inquire.
Low temperature performance optimization: The flexible molecular chain reinforcement material of CPE enhances its flexibility in low-temperature environments, avoiding low-temperature brittleness.
2、 Improve processing performance and compatibility
Enhanced interface bonding: Plant fibers (such as cellulose) contain a large number of hydroxyl groups and have poor compatibility with hydrophobic PVC. The polar chlorine atoms and non-polar chain segment structure of CPE act as a “bridge” to improve the interfacial adhesion between fibers and PVC, reducing phase separation.
Optimize melt flowability: CPE reduces melt viscosity, alleviates the deterioration of processing flowability caused by high filling amount of wood powder, and makes mixing and extrusion molding smoother.
Rheological study shows that 5 phr CPE can promote PVC gel formation and increase the complex viscosity of the melt; At 10 portions, the viscosity is reduced to balance processing efficiency and performance.
3、 Functional feature enhancement
Flame retardancy improvement: The higher the chlorine content of CPE (preferably 36-38%), the more significant the flame retardant effect. Its chlorine atoms release hydrogen chloride during combustion to suppress flame spread.
Weather resistance and stability: The saturated molecular structure of CPE endows composite materials with excellent aging resistance, ozone resistance, and chemical corrosion resistance, extending their outdoor service life.
4、 Comprehensive control of mechanical properties
Strength and rigidity balance: An appropriate amount of CPE (5-15 parts) can improve toughness while maintaining the material’s tensile strength, rigidity, and creep resistance. Excessive addition may lead to a decrease in strength, which needs to be controlled through formula optimization.
5、 Summary
CPE solves the problems of high brittleness, difficult processing, and flammability in PVC wood plastic composites through a four fold mechanism of toughening, interface compatibility, processing aids, and functional enhancement, becoming the core modifier for their high-performance development. Reasonably selecting CPE with a chlorine content of 35-38% and optimizing the addition amount (usually 5-15 parts) can achieve a balance between performance and cost.
Post time: Jul-11-2025
