Thermoplastic Resin Composition Impact Resistance
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Solution Overview
Problem
Polyester-based thermoplastic resins used in display devices face challenges with low impact resistance and processability issues when polysiloxane compounds are added to enhance photostability and discoloration resistance, while polyamide resin compositions suffer from deterioration in mechanical properties and short-term photostability.
Innovation Solution
A thermoplastic resin composition comprising a polyester resin, a reactive polysiloxane, and a white pigment, with specific weight percentages and molecular weight ranges, which improves impact resistance, thermal resistance, and photostability without compromising processability or mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polysiloxane compound is added to polyester resin to improve impact resistance, then impact resistance is improved, but processability deteriorates due to bleeding out and other issues when large amounts are added
Solution Approach 1:
The patent changes the chemical parameters of the polysiloxane compound by introducing specific functional groups (epoxy, amine, vinyl, methacrylate, or acid anhydride) at the terminal positions, and controls the molecular weight within a specific range (3,000-1,000,000 g/mol). This parameter optimization allows the polysiloxane to improve impact resistance while maintaining processability by preventing bleeding out issues that occur with conventional polysiloxane additions.
2Reliability
If additives such as photostabilizers are added to polyamide resin composition to enhance photostability and discoloration resistance, then photostability is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent uses a reactive polysiloxane compound as an intermediary substance that bridges the polyester resin and white pigment. This intermediary approach allows the system to achieve photostability and discoloration resistance through the polysiloxane's reactive functional groups without requiring traditional photostabilizer additives that would compromise mechanical properties.
3Temperature
If high thermal resistance polyester resin is used to achieve no deformation at high temperature and good discoloration resistance, then thermal resistance is improved, but impact resistance becomes low
Solution Approach 1:
The patent creates a composite material system combining polyester resin with specific functional groups, reactive polysiloxane compound, and white pigment. This composite approach allows the material to simultaneously achieve high thermal resistance from the polyester base, improved impact resistance from the reactive polysiloxane, and optical properties from the white pigment, resolving the contradiction between thermal and impact resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition exhibits enhanced impact resistance, thermal resistance, photostability, and discoloration resistance, maintaining mechanical strength and optical efficiency while minimizing yellowing and reflectance deterioration, even under high temperature and humidity conditions.
Implementation Method 1
a reactive polysiloxane; wherein the reactive polysiloxane may include a composition represented by Formula 1: (wherein R1 to R4 are each independently one selected from among a C1 to C8 alkyl group, an epoxy group, an amine group, a vinyl group, a (meth)acrylate group, and an acid anhydride group)
Implementation Method 2
a white pigment; wherein the white pigment may include at least one selected from the group consisting of titanium oxide, zinc oxide, zinc sulfide, white lead, zinc sulfate, barium sulfate, calcium carbonate, aluminum oxide, and mixtures thereof
Implementation Method 3
exhibiting good properties in terms of thermal resistance, durability, mechanical strength, photostability, discoloration resistance, and reflectance
Implementation Method 4
exhibiting good properties in terms of thermal resistance, durability, mechanical strength, photostability, discoloration resistance, and reflectance
Data Source
AI summary
The present invention relates to a polyester-based thermoplastic resin composition comprising (A) a polyester resin, (B) a reactive polysiloxane and (C) a white pigment, having remarkable photostability, discoloration resistance and reflectance, thermal resistance, durability and mechanical strength, and capable of remarkably improving impact strength.