‌Advantages of CPE in PVC Processing

CPE(chlorinated polyethylene), as a core additive for PVC modification, significantly enhances the comprehensive performance of PVC products through molecular structure optimization and synergistic effects. Its core advantages are reflected in the following aspects:

‌1. Enhanced Impact Resistance‌

Low-temperature resistance to brittleness and cracking: The CPE molecular chain contains flexible chlorine atomic groups, which can significantly enhance the toughness of PVC. The impact strength of rigid PVC with 8-12% CPE added is increased by 3-5 times. It remains flexible and non-brittle at -30 ° C, making it suitable for building materials and automotive parts in cold regions.

Balanced mechanical properties: Through solid-phase force-chemical treatment to form a PVC-g-CPE graft structure, the impact strength is increased by 472%, and the tensile strength and elongation at break are optimized simultaneously, achieving the "combination of rigidity and flexibility" of the material.

‌2. Enhanced weather resistance and durability‌

‌UV Resistance‌: CPE’s lack of reactive double bonds grants superior weatherability compared to PVC. Outdoor PVC profiles (e.g., doors, windows, pipes) exhibit a lifespan exceeding 20 years, with yellowing reduced by 50%.

‌Chemical Corrosion Resistance‌: High tolerance to acids, alkalis, and salts makes CPE ideal for chemical tank linings and industrial pipelines.

‌3. Optimized Processing Performance‌

‌Wide-Temperature Stability‌: CPE-PVC compatibility reaches 98%, ensuring stable melt flow within 160-200°C processing temperatures. This reduces extrusion swelling and surface defects, increasing yield by 15%.

‌Synergistic Flame Retardancy‌: With 36-38% chlorine content, CPE forms a synergistic flame-retardant system with PVC, raising the oxygen index to 45% and reducing smoke density by 60%, meeting fire safety standards (e.g., GB 8624 Class A).

‌4. Eco-Friendliness and Cost Efficiency‌

‌Non-Toxic and Recyclable‌: CPE contains no heavy metals or poly cyclic aromatics, complies with ISO certification, and integrates well with recycled PVC, supporting circular economies.

‌Cost Savings‌: Replacing traditional tougheners (e.g., MBS, ABS) with 30% less CPE achieves equivalent performance, reducing overall costs by 20%.

‌5. Diverse Applications‌

‌Construction‌: Impact-resistant and weatherproof profiles, pipes, and waterproof membranes;

‌Industrial Products‌: Corrosion-resistant cable sheaths, valves, and storage tanks;

‌Automotive Components‌: Low-temperature impact-optimized bumpers and interior parts.

Shandong AXA Chem Co.,Ltd

April 28, 2025