Polyester Plasticizer for Vinyl Chloride Resin With Low Solidification Point
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Solution Overview
Problem
Existing polyester-based plasticizers for vinyl chloride resins used in automotive dashboards suffer from crystallization and bleeding, leading to deterioration of plasticization performance and potential safety hazards during airbag deployment due to insufficient heat and cold resistance.
Innovation Solution
A plasticizer for vinyl chloride resin composed of specific glycols, aliphatic dicarboxylic acids, and monoalcohols, including 1,5-pentanediol, with a low solidification point, is developed to provide both heat and cold resistance, suppressing bleeding and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyester-based plasticizer using 1,5-pentanediol is used to impart heat resistance and cold resistance, then heat resistance and cold resistance are improved, but the solidification point increases causing crystallization and bleeding
Solution Approach 1:
The patent changes the chemical composition parameters of the glycol mixture by incorporating specific branched-chain glycols (1,2-propanediol, 1,3-butanediol, 2-methyl-1,3-propanediol, neopentyl glycol, or 3-methyl-1,5-pentanediol) alongside 1,5-pentanediol. This compositional parameter change lowers the solidification point of the polyester plasticizer while preserving its heat and cold resistance properties, preventing crystallization and bleeding.
Solution Approach 2:
The patent creates a composite glycol system by combining 1,5-pentanediol with specific branched-chain glycols in defined ratios. This composite approach allows the plasticizer to benefit from the heat resistance provided by 1,5-pentanediol while the branched-chain glycols contribute to lowering the solidification point, achieving both requirements simultaneously.
2Temperature
If the solidification point of the polyester plasticizer is increased to improve heat resistance, then heat resistance is improved, but crystallization and bleeding occur deteriorating plasticization performance
Solution Approach 1:
The patent optimizes the chemical composition parameters of the polyester plasticizer by controlling the types and ratios of glycols used. Specifically, it uses 1,5-pentanediol combined with branched-chain glycols in a balanced formulation that achieves adequate heat resistance while maintaining a low enough solidification point to prevent crystallization, thus preserving plasticization performance.
3Adaptability or versatility
If a phthalate ester plasticizer is used to achieve good price and performance balance, then compatibility and processability are improved, but heat resistance is insufficient for automotive dashboard applications
Solution Approach 1:
The patent transitions from using phthalate esters to a polyester-based plasticizer with specifically controlled compositional parameters. The polyester plasticizer uses a glycol mixture containing 1,5-pentanediol and branched-chain glycols, which changes the thermal properties to achieve sufficient heat resistance for automotive applications while maintaining compatibility and processability through appropriate molecular weight control (500-4,000).
Data Source
AI summary
Provided is a plasticizer for a vinyl chloride resin that has a low solidification point and can impart both heat resistance and cold resistance to a vinyl chloride resin molded product. Specifically, provided is a plasticizer for a vinyl chloride resin that is a polyester using a glycol having 2 to 18 carbon atoms, an aliphatic dicarboxylic acid having 4 to 14 carbon atoms, and a monoalcohol having 4 to 18 carbon atoms and/or a monocarboxylic acid having 2 to 21 carbon atoms as reaction raw materials, in which the glycol includes 1,5-pentanediol and an alkylene glycol having a branched alkylene chain having 3 to 18 carbon atoms; and in which the 1,5-pentanediol in the glycol has a content proportion within a range of 5 to 90 mol%.