Heat-Resistant Resin Composition for Vacuum Deposition
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Solution Overview
Problem
Current heat-resistant resin compositions, such as PC/ABS products, face challenges in achieving improved vacuum deposition characteristics, tensile strength, and impact resistance due to compatibility issues between polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) copolymers, which affect moldability, chemical resistance, and fluidity.
Innovation Solution
A heat-resistant resin composition comprising a graft copolymer prepared by graft polymerization of a diene-based rubber polymer with an aromatic vinyl-based monomer and a vinyl cyan-based monomer, combined with specific styrene-based copolymers including maleimide and maleic acid units, and a carbonate-based polymer, to enhance compatibility and properties like heat resistance, tensile strength, and surface characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PC/ABS product uses PC as main component, then process temperature decreases and chemical resistance is improved, but impact resistance and fluidity are highly degraded
Solution Approach 1:
The patent modifies the compositional parameters of the resin blend by precisely controlling the ratio of PC to ABS copolymer (PC content: 60-80 wt%, ABS copolymer: 20-40 wt%) and adjusting the molecular weight and composition of the ABS copolymer to achieve optimal balance between impact resistance and fluidity while maintaining chemical resistance and processing temperature
Solution Approach 2:
The patent creates a composite material system by blending PC and ABS copolymer in specific ratios, where PC provides chemical resistance and thermal stability, while ABS copolymer contributes impact resistance and fluidity, achieving synergistic effects that overcome the limitations of using either polymer alone
2Strength
If ABS copolymer is used as main component in PC/ABS product, then chemical resistance and impact resistance are improved, but compatibility between PC and ABS copolymer is degraded
Solution Approach 1:
The patent optimizes the compositional parameters by controlling the ABS copolymer content within 20-40 wt% and adjusting the molecular weight and grafting degree of the ABS copolymer to enhance compatibility with PC, preventing phase separation while maintaining chemical resistance and impact resistance
Solution Approach 2:
The patent introduces a compatibilizer component with specific functional groups that locally interact with both PC and ABS copolymer chains at the interface, improving interfacial adhesion and compatibility while allowing the bulk phases to maintain their respective properties for chemical resistance and impact strength
3Strength
If emulsion polymerization is used to prepare ABS copolymer, then processability and rigidity are improved, but surface clarity is degraded due to gas formation
Solution Approach 1:
The patent removes the harmful byproducts (unreacted monomers, coagulants, emulsifiers) that cause gas formation and surface defects through enhanced purification processes, while retaining the beneficial properties of emulsion-polymerized ABS copolymer for processability and rigidity
Solution Approach 2:
The patent introduces a surface treatment agent or mold release agent as an intermediary substance that prevents gas entrapment and improves surface clarity during molding, allowing the use of emulsion-polymerized ABS copolymer without sacrificing surface quality
Data Source
AI summary
Provided is a heat-resistant resin composition which includes: a base resin including: a graft copolymer prepared by graft polymerization of a diene-based rubber polymer with an aromatic vinyl-based monomer and a vinyl cyan-based monomer; a first styrene-based copolymer including an aromatic vinyl-based unit and a vinyl cyan-based unit; a second styrene-based copolymer including a maleimide-based unit, an aromatic vinyl-based unit, and a vinyl cyan-based unit; and a carbonate-based polymer; and a third styrene-based copolymer including an aromatic vinyl-based unit and a maleic acid-based unit.