Liquid Crystal Polyester Reflective Plate Sizing Agent
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Solution Overview
Problem
The existing liquid crystal polyester compositions used in reflective plates for LED devices often suffer from insufficient reflectivity due to coloration caused by conventional sizing agents used in glass fiber bundles, which affect the weld strength and moldability of the materials.
Innovation Solution
A liquid crystal polyester composition is developed using a polyurethane sizing agent with a polyester polyol unit and aliphatic or alicyclic diisocyanate units, blended with a white pigment and glass fiber bundles, to enhance the reflectivity and heat resistance of the reflective plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional sizing agent (polyurethane with aromatic diisocyanate) is used to bundle glass fibers, then the glass fiber bundle has excellent handling properties and low cost, but the sizing agent causes coloration of the liquid crystal polyester composition, reducing reflectivity
Solution Approach 1:
The patent changes the chemical parameters of the sizing agent by replacing aromatic diisocyanate with aliphatic or alicyclic diisocyanate units. This parameter change eliminates the coloration problem while maintaining the glass fiber bundling properties, thus preserving reflectivity in the liquid crystal polyester composition.
Solution Approach 2:
The patent applies local quality by specifically modifying the chemical structure of the sizing agent at the molecular level (using aliphatic or alicyclic diisocyanate units instead of aromatic ones) while keeping the overall sizing agent function intact. This localized chemical modification prevents coloration without affecting the glass fiber bundling performance.
2Strength
If glass fiber bundle is blended with liquid crystal polyester to enhance weld strength and reduce anisotropy, then the molded body has improved mechanical properties, but the conventional sizing agent causes coloration that reduces reflectivity
Solution Approach 1:
The patent changes the chemical composition parameters of the sizing agent by substituting aromatic diisocyanate with aliphatic or alicyclic diisocyanate units. This allows the glass fiber bundle to maintain its strength-enhancing properties while eliminating the harmful coloration effect, thus preserving both weld strength and reflectivity.
Solution Approach 2:
The patent creates a composite sizing agent system combining glass fibers with a specifically formulated polyurethane containing aliphatic or alicyclic diisocyanate units. This composite material provides both the mechanical reinforcement needed for weld strength and the optical clarity required for high reflectivity.
3Ease of manufacture
If liquid crystal polyester is used for reflective plate to achieve good processability and lightweight properties, then the reflective plate has excellent moldability, but insufficient reflectivity occurs when conventional sizing agents are used
Solution Approach 1:
The patent modifies the chemical parameters of the sizing agent by using aliphatic or alicyclic diisocyanate units instead of aromatic ones. This parameter change eliminates coloration while maintaining the processability benefits of the liquid crystal polyester, thus achieving both good moldability and high reflectivity.
Data Source
AI summary
The present invention provides a composition comprising a liquid crystal polyester, a white pigment and a glass fiber bundle obtained by bundling glass fibers using a sizing agent comprising a polyurethane having a polyester polyol unit and at least one of an aliphatic diisocyanate unit or an alicyclic diisocyanate unit, wherein the polyester polyol unit is a polyol unit having an aliphatic polyhydric alcohol unit and at least one of an aliphatic polybasic acid unit or an alicyclic polybasic acid unit. The liquid crystal polyester composition can provide a reflective plate having a high reflectivity.