Recycled Thermoplastic Resin Composition with Epoxy Ester Stabilization
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Solution Overview
Problem
Existing recycled thermoplastic resin compositions face issues with degradation due to the presence of inorganic metals and foreign substances, leading to deterioration in properties such as impact resistance, fluidity, flame retardancy, thermal stability, and chemical resistance when high amounts of recycled materials like OBP PET and ITE-PCM PC are used.
Innovation Solution
A recycled thermoplastic resin composition comprising 80-99 wt% recycled polycarbonate resin, 1-20 wt% recycled polyester resin, 0.5-20 parts by weight of a rubber-modified aromatic vinyl copolymer resin, 10-30 parts by weight of a phosphorus flame retardant, and 0.1-1 part by weight of an epoxy ester compound, which improves impact resistance, fluidity, and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high content of recycled materials (OBP PET and ITE-PCM PC) is used, then eco-friendliness and resource utilization are improved, but degradation of polymer resins and deterioration of material properties occur due to inorganic metals and foreign substances
Solution Approach 1:
The patent introduces a compound comprising a carboxyl group and a hydroxyl group as an intermediary substance that reacts with inorganic metals and foreign substances in recycled materials. This intermediary compound acts as a mediator to neutralize harmful elements while preserving the eco-friendly characteristics of high recycled content, thereby resolving the contradiction between eco-friendliness and material property stability.
Solution Approach 2:
The patent modifies the chemical parameters of the resin composition by controlling the content of the compound with carboxyl and hydroxyl groups within specific ranges (0.1-5 parts by weight per 100 parts of recycled thermoplastic resin). This parameter optimization enables the material to maintain both high recycled content for eco-friendliness and stable material properties by preventing degradation from inorganic metals.
2Quantity of substance
If inorganic metals and foreign substances are present in recycled materials, then recycled content is increased, but impact resistance and fluidity of the resin composition deteriorate
Solution Approach 1:
The compound with carboxyl and hydroxyl groups serves as a intermediary that binds with inorganic metals and foreign substances, preventing them from adversely affecting impact resistance. This allows high recycled content to be maintained while preserving mechanical strength properties.
Solution Approach 2:
The patent converts the harmful effect of inorganic metals and foreign substances into a beneficial interaction by using the compound with carboxyl and hydroxyl groups to react with these contaminants. This transformation allows the presence of recycled materials with inorganic content to actually improve the overall composition stability while maintaining impact resistance.
3Quantity of substance
If inorganic metals and foreign substances are present in recycled materials, then recycled content is increased, but flame retardancy and thermal stability of the resin composition deteriorate
Solution Approach 1:
The compound comprising carboxyl and hydroxyl groups acts as a intermediary substance that interacts with inorganic metals and foreign substances, preventing thermal degradation. This enables high recycled content to be incorporated while maintaining thermal stability and flame retardancy properties.
Solution Approach 2:
The patent applies preliminary anti-action by incorporating the compound with carboxyl and hydroxyl groups before processing the recycled materials. This pre-treatment prevents thermal degradation from occurring during subsequent processing and use, thereby maintaining thermal stability even with high recycled content containing inorganic metals.
4Quantity of substance
If inorganic metals and foreign substances are present in recycled materials, then recycled content is increased, but chemical resistance of the resin composition deteriorates
Solution Approach 1:
The compound with carboxyl and hydroxyl groups serves as a intermediary that reacts with inorganic metals and foreign substances, forming stable complexes that do not compromise chemical resistance. This allows high recycled content to be maintained while preserving chemical resistance properties.
Solution Approach 2:
The patent converts the potential harmful effect of inorganic metals on chemical resistance into a beneficial interaction by using the compound with carboxyl and hydroxyl groups to bind with these metals. This transformation maintains chemical resistance even when high amounts of recycled materials with inorganic content are used.
Data Source
AI summary
A recycled thermoplastic resin composition of the present invention comprises: about 100 parts by weight of a recycled thermoplastic resin comprising about 80-99% by weight of a recycled polycarbonate resin and about 1-20% by weight of a recycled polyester resin recovered within 50 km from the coastline; about 0.5-20 parts by weight of a rubber-modified aromatic vinyl copolymer resin; about 10-30 parts by weight of a phosphorus-based flame retardant; and about 0.1-1 part by weight of an epoxy ester compound containing an ester group and an epoxy group. The recycled thermoplastic resin composition is excellent in impact resistance, fluidity, flame retardancy, thermal stability, appearance characteristics, heat resistance, chemical resistance, and balance between these properties.