Thermoplastic Resin Composition Suppressing Coating Absorption
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Solution Overview
Problem
The absorption phenomenon, leading to gloss unevenness and coating defects, occurs in thermoplastic resin compositions during high-speed molding and when using strong coating materials, which compromises the impact resistance, heat resistance, and fluidity of molded articles.
Innovation Solution
A thermoplastic resin composition comprising 35 to 75 parts of aromatic polycarbonate resin, 15 to 35 parts of rubber-containing graft copolymer, and 10 to 50 parts of a rigid copolymer mixture, with specific monomer unit ratios and viscosity ranges, which suppresses the absorption phenomenon while maintaining impact resistance, heat resistance, and fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed molding conditions are used to shorten the molding cycle and improve productivity, then productivity is improved, but the absorption phenomenon occurs more frequently leading to coating defects
Solution Approach 1:
The invention changes the chemical composition parameters of the resin by incorporating a graft copolymer with specific functional groups (carboxyl, hydroxyl, or amine groups) at controlled concentrations (0.1-10 mmol/g). This parameter change modifies the resin's surface properties and coating interaction, enabling successful coating even under high-speed molding conditions that previously caused absorption phenomena and gloss unevenness.
Solution Approach 2:
The invention creates a composite resin system by blending aromatic polycarbonate (providing heat resistance and rigidity) with ABS resin (providing impact resistance) and adding a graft copolymer (providing coating compatibility). This composite material approach allows the resin to simultaneously achieve high productivity through efficient molding, excellent coating quality by suppressing absorption phenomena, and maintained mechanical properties.
2Manufacturing precision
If coating materials with strong attack properties are used to improve coating performance, then coating quality is improved, but the absorption phenomenon occurs more frequently
Solution Approach 1:
The graft copolymer acts as an intermediary substance between the coating material and the base resin. Its functional groups (carboxyl, hydroxyl, or amine groups) create compatible interaction interfaces that mediate the coating process, allowing strong-attack coating materials to apply uniformly without causing absorption phenomena or gloss unevenness on the molded article surface.
Solution Approach 2:
The invention modifies the resin's chemical parameters by adding graft copolymer with specific functional group concentrations (0.1-10 mmol/g). This parameter change creates a surface chemistry that is compatible with strong-attack coating materials, enabling them to perform effectively without inducing absorption phenomena that would compromise coating quality.
3Strength
If ABS-based resin is used alone to ensure impact resistance, then impact resistance is improved, but heat resistance and coatability are insufficient
Solution Approach 1:
The invention creates a composite resin system combining ABS resin (providing impact resistance through its rubber phase) with aromatic polycarbonate (providing heat resistance and rigidity). The graft copolymer is added to ensure coating compatibility. This composite approach allows the material to simultaneously achieve impact resistance, heat resistance, and good coatability, overcoming the limitations of using ABS resin alone.
Solution Approach 2:
The composite resin system is designed to perform multiple functions simultaneously: the ABS component provides impact resistance, the aromatic polycarbonate provides heat resistance and structural rigidity, and the graft copolymer provides coating compatibility. This multi-functional material design eliminates the need to choose between different resin types for different properties.
4Temperature
If aromatic polycarbonate resin is used alone to ensure heat resistance, then heat resistance is improved, but fluidity and secondary workability deteriorate
Solution Approach 1:
The invention creates a composite resin system where aromatic polycarbonate (providing heat resistance) is blended with ABS resin (providing excellent fluidity and moldability). The graft copolymer is added to maintain coating compatibility. This composite approach allows the material to simultaneously achieve the heat resistance of aromatic polycarbonate and the superior fluidity of ABS, overcoming the limitations of using aromatic polycarbonate alone.
Data Source
AI summary
The present invention provides a thermoplastic resin composition in which occurrence of an absorption phenomenon in a coating step can be suppressed and which is excellent in terms of impact resistance, heat resistance, and fluidity during a molding step; a coated article; and a molded resin article obtained by molding the thermoplastic resin composition. The thermoplastic resin composition contains: 35 to 75 parts by mass of an aromatic polycarbonate resin (A); 15 to 35 parts by mass of a rubber-containing graft copolymer (B) obtained by copolymerizing a monomer mixture comprising an aromatic vinyl compound and a vinyl cyanide compound in the presence of a rubbery polymer; and 10 to 50 parts by mass of a rigid copolymer mixture (C) containing a rigid copolymer (C-I) and a rigid copolymer (C-II), in which in the rigid copolymer mixture (C), an amount of the rigid copolymer (C-II) is 20% to 80% by mass in the mixture.