Polycarbonate Window Frame Resin Composition
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Solution Overview
Problem
Conventional polyvinyl chloride (PVC) resin and acrylonitrile-butadiene-styrene (ABS) resin used in window frames face issues with dimension stability and impact strength due to environmental concerns and the need for alternative materials that do not degrade over time or release harmful substances.
Innovation Solution
A resin composition combining 40-95% polycarbonate resin with 1-50% acrylic-based rubber-styrene-vinyl cyan copolymer and 10-30% ultra-high molecular weight styrene-vinyl cyan copolymer resin, along with additives like polypropylene glycol, flame retardants, and antioxidants, to enhance mechanical properties and reduce linear expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyvinyl chloride (PVC) resin is used for window frames, then ease of manufacture is improved, but harmful factors are generated (dioxin during processing, heavy metal ions from thermal stabilizers)
Solution Approach 1:
The patent changes the chemical composition parameters by replacing PVC resin with polycarbonate resin as the base material, and replacing cadmium/lead stearate thermal stabilizers with zinc stearate and polyphosphate. This parameter change eliminates dioxin generation during processing and removes harmful heavy metal ions while maintaining manufacturing feasibility
Solution Approach 2:
The patent creates a composite material system combining polycarbonate resin with specific additives (zinc stearate, polyphosphate, impact modifiers) to achieve both environmental safety and functional performance. The composite structure allows the base polymer to provide structural integrity while additives provide thermal stability without harmful byproducts
2Ease of operation
If polycarbonate resin is mixed with conventional copolymer resin to improve molding workability, then ease of operation is improved, but dimension stability deteriorates due to high coefficient of linear expansion
Solution Approach 1:
The patent changes the molecular weight parameter of the copolymer resin component to ultra-high molecular weight (≥1,000,000), which fundamentally alters the rheological properties and thermal expansion characteristics of the mixture, achieving both improved processability and reduced linear expansion coefficient
Solution Approach 2:
The patent applies local quality by selecting specific functional components (ultra-high molecular weight copolymer resin with non-linear structure) to perform specific functions (reducing linear expansion) while other components (polycarbonate resin, impact modifiers) provide their respective functions (structural integrity, toughness)
3Object-generated harmful factors
If conventional copolymer resin is used to replace PVC, then environmental harm is reduced, but impact strength deteriorates
Solution Approach 1:
The patent creates a composite system where polycarbonate resin provides base structural integrity, ultra-high molecular weight copolymer resin provides toughness and impact resistance, and impact modifiers (methyl methacrylate-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer) provide enhanced impact strength, achieving both environmental safety and mechanical performance
Solution Approach 2:
The patent merges multiple resin components and additives into a unified composite material system where each component contributes specific properties: polycarbonate for structural integrity, ultra-high molecular weight copolymer for reduced expansion and improved toughness, and impact modifiers for enhanced impact resistance, achieving synergistic effects
Data Source
Figure 1
AI summary
One embodiment of the present invention provides a resin composition containing a polycarbonate resin for window frames, wherein the resin composition for window frames includes: 40 to 95 wt% of a polycarbonate resin; 1 to 50 wt% of a copolymer resin of acrylic-based rubber-styrene-based monomer-vinyl cyan-based monomer; and 1 to 30 wt% of an ultra-high molecular weight copolymer resin of styrene-based monomer-vinyl cyan-based monomer having a weight average molecular weight (Mw) of 1,000,000 to 3,000,000, based on the total weight of the resin composition for window frames.