Titanium Oxide Coated Resin Composition Thermal Stability
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Solution Overview
Problem
Conventional polycarbonate resin compositions face challenges in achieving high reflectance and thermal stability during molding, as increasing titanium oxide content to enhance reflectance often compromises thermal stability, and existing methods to improve thermal stability are insufficient.
Innovation Solution
A thermoplastic resin composition comprising 40-98% thermoplastic resin and 2-60% titanium oxide particles coated with hydrous oxide or metal oxides, specifically aluminum, silicon, zirconium, tin, cerium, titanium, or zinc, with controlled surface coating to maintain thermal stability and reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the amount of titanium oxide is increased to improve reflectance, then reflectance is improved, but thermal stability in residence during molding becomes increasingly poor
Solution Approach 1:
The patent introduces a silicone oxide coating as an intermediary layer between the titanium oxide particles and the polycarbonate resin. This coating acts as a protective barrier that prevents direct contact and hydrolysis reaction between the titanium oxide and resin, thereby maintaining thermal stability while allowing high titanium oxide content for reflectance improvement
Solution Approach 2:
The patent creates a composite structure where titanium oxide particles are coated with silicone oxide, forming a core-shell composite material. This composite approach combines the high reflectance property of titanium oxide with the thermal stability and chemical inertness of silicone oxide coating
2Reliability
If titanium oxide is coated with reactive silicone in advance to prevent hydrolysis reaction, then thermal stability is improved, but the coating amount of silica-alumina must be increased which limits further improvement
Solution Approach 1:
The patent changes the chemical composition parameter of the coating material from traditional silica-alumina to silicone oxide, which provides superior thermal stability and hydrolysis resistance. This parameter change allows for more effective protection with appropriate coating amounts
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 achieves excellent reflectance and thermal stability in molded objects, even under prolonged residence times, by optimizing the blending ratio and surface treatment of titanium oxide particles, preventing hydrolysis and maintaining mechanical strength.
Implementation Method 1
the composition achieves excellent reflectance... by optimizing the blending ratio and surface treatment of titanium oxide particles
Implementation Method 2
to prevent hydrolysis reaction between the polycarbonate resins and titanium oxide by using a method such as coating titanium oxide with a reactive silicone in advance
Data Source
AI summary
A thermoplastic resin composition which comprises (A) 40 to 98 mass % thermoplastic resin and (B) 60 to 2 mass % titanium oxide particles whose surface has been coated with a hydrous oxide and/or oxide of at least one metal selected from the group consisting of aluminum, silicon, zirconium, tin, cerium, titanium, and zinc, wherein the titanium oxide particles contain 80 to 97 mass %, excluding 97 mass %, titanium oxide ingredient and have total content of alkali metal cations and alkaline earth metal cations extractable with pure water of 120 mass ppm or lower. The resin composition is excellent in reflectance and thermal stability in residence during molding into large products.