PVC Copolymer Core-Shell Modifier for Extrusion Load Reduction
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Solution Overview
Problem
Existing PVC-based compound compositions face challenges with compatibility, processability, and cost competitiveness due to issues like low temperature impact resistance and plasticizer migration, and they often require additional modifiers that increase costs and process loads.
Innovation Solution
A PVC-based compound composition incorporating a vinyl chloride-based copolymer with a core-shell structure, comprising a vinyl chloride-alkyl acrylate polymer core and a polyvinyl chloride shell, which enhances internal plasticity and compatibility with PVC resin, reducing the need for additional modifiers and improving processability and impact strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a modifier is used to improve processability of PVC resin, then processability is improved, but compatibility with PVC resin is lowered and plasticizer migration occurs
Solution Approach 1:
The patent uses a PVC-based copolymer as the core material of the impact modifier, ensuring homogeneous composition with the PVC resin matrix. This homogeneity prevents phase separation and migration issues while maintaining good processability, directly resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent creates a composite impact modifier by combining PVC resin with a small amount of copolymer (10-50 wt% based on total copolymer weight). This composite structure leverages the compatibility of PVC with the main matrix while incorporating functional copolymer components for impact modification and processing improvement.
2Strength
If additional modifiers are used to improve impact strength, then impact strength is improved, but cost increases and process load increases
Solution Approach 1:
The PVC-based copolymer impact modifier performs multiple functions simultaneously: it provides impact modification, improves processability, and enhances compatibility with PVC resin. This multi-functionality eliminates the need for separate processing aids and plasticizers, reducing process complexity and cost while maintaining or improving impact strength.
Solution Approach 2:
The patent merges the functions of impact modification and processing aid into a single PVC-based copolymer component. By combining these functions in one material, the process load is reduced and cost competitiveness is improved while achieving the desired impact strength.
3Ease of manufacture
If plasticizer is used to improve processability, then processability is improved, but plasticizer migration occurs over time
Solution Approach 1:
The patent extracts the plasticizing function from separate plasticizer additives and incorporates it into the copolymer structure itself. The copolymer contains internal plasticity due to its molecular structure, eliminating the need for external plasticizers and preventing migration issues while maintaining good processability.
Solution Approach 2:
The copolymer provides self-plasticizing capability through its inherent molecular structure. The copolymer chains contain flexible segments that provide internal plasticity, allowing the material to self-regulate its processing characteristics without requiring additional plasticizer additives that would migrate over time.
Data Source
AI summary
The present invention relates to a polyvinyl chloride (PVC)-based compound composition, and more specifically, to a PVC-based compound composition that uses a PVC-based copolymer having internal plasticity prepared by suspension polymerization together with a PVC resin, thereby increasing compatibility with the PVC resin to shorten the gelling time, lowering the load at the time of extrusion to increase production in the same process conditions, and partially showing an impact modifier substitution effect.