Liquid Crystal Polyester Composition Lubricant Plasticizing Time
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Solution Overview
Problem
Current liquid crystal polyester compositions for injection molding require longer plasticizing times, leading to variations in the dimensions and external appearance of molded articles, and there is a need for materials that can shorten this process effectively.
Innovation Solution
A liquid crystal polyester composition is developed by incorporating a fatty acid metal salt with 20 or less carbon atoms and a sieve residue of 0-80% by mass, which acts as a lubricant to reduce the plasticizing time during injection molding, along with an inorganic filler like glass fiber or mica, and is used in conjunction with a specific structural unit and melting point range to enhance moldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid crystal polyester resin is used for injection molding with shortened molding cycle, then productivity is improved, but plasticizing time becomes too long causing variations in dimensions and external appearance
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid crystal polyester by incorporating specific additives (fatty acid metal salts with controlled carbon atom numbers and sieve residues) to modify the plasticizing characteristics. This allows the material to achieve proper plasticization faster while maintaining the benefits of shortened molding cycles for improved productivity.
2Manufacturing precision
If plasticizing time is lengthened to ensure complete plasticization, then molding quality is improved, but productivity deteriorates due to longer production cycle
Solution Approach 1:
The patent introduces fatty acid metal salts as intermediary substances that facilitate the plasticization process. These additives act as mediators between the heating element and the polymer material, enabling complete plasticization to occur within shorter time frames, thus maintaining both quality and productivity.
Solution Approach 2:
By controlling the carbon atom number (16-20) and sieve residue (20-80%) of the fatty acid metal salt additives, the patent optimizes the plasticization kinetics. This parameter optimization allows the system to achieve complete plasticization faster, reducing the overall production cycle time while maintaining molded article quality.
3Loss of time
If fatty acid metal salt with high carbon atoms is used to improve lubrication, then plasticizing time is shortened, but material compatibility and processing stability deteriorate
Solution Approach 1:
The patent precisely controls the carbon atom number parameter of the fatty acid metal salt to fall within the range of 16-20. This parameter optimization balances the lubrication effect (which requires higher carbon atoms) with material compatibility and processing stability (which deteriorate with excessively high carbon atoms), achieving both time reduction and reliability maintenance.
Solution Approach 2:
The patent also controls the sieve residue parameter (20-80%) to optimize particle size distribution. This parameter control ensures proper flow characteristics and mixing behavior during injection molding, maintaining processing stability while achieving adequate lubrication for shortened plasticizing time.
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 significantly shortens the plasticizing time in injection molding, stabilizes injection pressure, and improves the moldability of the liquid crystal polyester, resulting in consistent and high-quality injection molded articles with improved thermal deformation resistance.
Implementation Method 1
a fatty acid metal salt from a specific sieve residue and having a specific number of carbon atoms... which acts as a lubricant to reduce the plasticizing time during injection molding
Data Source
AI summary
A liquid crystal polyester composition comprising a liquid crystal polyester and a fatty acid metal salt, wherein the fatty acid metal salt comprises a fatty acid metal salt of which the number of carbon atoms is 20 or less, and a sieve residue of the fatty acid metal salt measured in accordance with JIS K 0069 for a sieve with a nominal opening of 106 μm prescribed in JIS Z 8801 is from 0 to 80% by mass relative to the total mass of the fatty acid metal salt.