Polyacetal Resin Metallic Appearance via UV Stabilizer Mixing
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Solution Overview
Problem
Polyacetal polymers face instability and adverse effects when combined with pigments, particularly metallic pigments, which result in a dull, glossy but not brilliant metallic appearance in molded parts, especially when molded at higher temperatures.
Innovation Solution
A polymer composition incorporating a metallic pigment, such as aluminum, combined with an ultraviolet light stabilizer like benzotriazole, and subjected to high-intensity mixing before molding, to achieve a brilliant metallic appearance with high gloss values exceeding 45 gloss units at a 60° angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metallic pigments are incorporated into polyacetal polymer compositions to achieve metallic appearance, then the metallic look is improved, but the gloss increases without maintaining brilliant metallic appearance
Solution Approach 1:
The patent applies parameter changes by controlling the mold surface temperature to be between 150°F and 200°F (65°C to 93°C), which is a specific temperature range that optimizes both gloss and metallic appearance. This temperature parameter control prevents the gloss from increasing too much while maintaining brilliant metallic appearance, resolving the contradiction between achieving metallic look and controlling gloss quality.
2Illumination intensity
If polyacetal polymers are combined with pigments and colorants to obtain desired appearance, then the appearance is improved, but the stability of the polymer is worsened
Solution Approach 1:
The patent uses an epoxy-based mold release agent as an intermediary substance between the polyacetal polymer and the metallic pigments. This mold release agent protects the polymer from adverse interactions with pigments while allowing the desired metallic appearance to be achieved. The intermediary prevents direct contact between potentially incompatible materials, thereby maintaining polymer stability.
3Ease of manufacture
If mold surface temperature is increased to greater than 200°F to increase surface gloss, then the gloss is improved, but the metallic brilliance is worsened
Solution Approach 1:
The patent inverts the conventional approach by lowering the mold surface temperature to between 150°F and 200°F instead of increasing it. This parameter change achieves the opposite effect of conventional processing: rather than high temperature increasing gloss at the expense of metallic brilliance, the controlled lower temperature produces both acceptable gloss and brilliant metallic appearance simultaneously.
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 solution produces molded parts with a high metallic brilliance and gloss, similar to chrome-plated parts, suitable for automotive and consumer applications, while maintaining stability and appearance across various temperatures.
Implementation Method 1
The metallic pigment and the ultraviolet light stabilizer can be combined with the polymer resin prior to forming the molded polymeric article using a high intensity mixer. It was discovered that adding the ultraviolet light stabilizer with the metallic pigment and subjecting the polymer composition to high intensity mixing prior to molding an article produces an article having an exterior surface that exhibits a gloss of greater than 45 gloss units
Implementation Method 2
The metallic pigment and the ultraviolet light stabilizer can be combined with the polymer resin prior to forming the molded polymeric article using a high intensity mixer
Implementation Method 3
The metallic pigment is incorporated into the polymer composition in a manner such that molded products made from the composition have a high metallic brilliant appearance. For example, molded articles made according to the present disclosure have high gloss properties and a metallic appearance similar to a chrome-plated part
Data Source
AI summary
A polymer composition containing a polyacetal resin, a metallic pigment, and an ultraviolet light stabilizer is disclosed that exhibits a metallic brilliant appearance. The metallic pigment, the ultraviolet light stabilizer and the polyacetal resin can be mixed in a high intensity mixer prior to being used to mold polymer articles.