Polycarbonate Resin Composition Flame Retardancy
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Solution Overview
Problem
Polycarbonate resin compositions face challenges in maintaining mechanical properties and flame retardancy under alkali or metal ion-rich conditions and high humidity, while adding flame retardants can compromise chemical resistance and mechanical properties.
Innovation Solution
A thermoplastic resin composition comprising a blend of polycarbonate resins with different molecular weights, a core-shell type rubber-modified vinyl graft copolymer, and a phosphorus flame retardant, along with an aromatic vinyl copolymer resin, which improves chemical resistance, impact resistance, flame retardancy, and fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a phosphorus flame retardant is added to a resin composition to improve flame retardancy, then flame retardancy is improved, but chemical resistance and mechanical properties deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters of the flame retardant by using phosphonate compounds with specific molecular structures (divinylbenzene phosphonate, trimethylolpropane phosphonate, pentaerythritol phosphonate) instead of conventional phosphorus flame retardants. This structural modification allows achieving flame retardancy while minimizing the deterioration of mechanical properties and chemical resistance.
Solution Approach 2:
The patent creates a composite resin composition by combining polycarbonate resin with specific phosphonate flame retardants and rubber-modified vinyl graft copolymers. This composite approach allows the flame retardant to work synergistically with the polymer matrix, maintaining mechanical integrity while providing flame retardancy.
2Reliability
If a phosphorus flame retardant is added to a resin composition to improve flame retardancy, then flame retardancy is improved, but chemical resistance deteriorates
Solution Approach 1:
The patent changes the chemical parameters by selecting phosphonate compounds with specific functional groups and molecular structures that are chemically compatible with polycarbonate resin. The use of divinylbenzene phosphonate, trimethylolpropane phosphonate, and pentaerythritol phosphonate provides flame retardancy while maintaining chemical resistance through optimized molecular architecture.
Solution Approach 2:
The patent introduces rubber-modified vinyl graft copolymers as intermediary substances that mediate between the phosphorus flame retardant and the polycarbonate resin matrix. This intermediary layer helps maintain chemical resistance while allowing the flame retardant to function effectively.
3Strength
If the molecular weight of polycarbonate resin is increased to improve mechanical properties, then strength is improved, but fluidity deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameters of the polycarbonate resin within a specific range (weight average molecular weight of 20,000 to 60,000 g/mol). This parameter optimization ensures adequate mechanical strength while maintaining sufficient fluidity for injection molding and other manufacturing processes.
Data Source
AI summary
Disclosed herein is a thermoplastic resin composition. The thermoplastic resin composition includes: about 100 parts by weight of a polycarbonate resin; about 1 part by weight to about 30 parts by weight of a core-shell type rubber-modified vinyl graft copolymer; about 5 parts by weight to about 50 parts by weight of an aromatic vinyl copolymer resin; and about 5 parts by weight to about 50 parts by weight of a phosphorus flame retardant, wherein the polycarbonate resin includes a first polycarbonate resin having a weight average molecular weight of about 10,000 g/mol to about 30,000 g/mol and a second polycarbonate resin having a weight average molecular weight of about 35,000 g/mol to about 60,000 g/mol, and the core-shell type rubber-modified vinyl graft copolymer is obtained by grafting an alkyl (meth)acrylate monomer to a rubber polymer. The thermoplastic resin composition can have good properties in terms of chemical resistance, impact resistance, flame retardancy, heat resistance, and/or fluidity.