Vinyl Chloride Resin Composition Low Temperature Flexibility
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Solution Overview
Problem
Vinyl chloride resin molded products require both excellent flexibility and strength at low temperatures, which existing compositions, such as those using straight chain trimellitate plasticizers, fail to consistently achieve.
Innovation Solution
A vinyl chloride resin composition combining a diester plasticizer and a trimellitate plasticizer with specific alkyl group ratios, where the diester plasticizer is formed from a compound with monovalent hydrocarbon groups and the trimellitate plasticizer has a predetermined straight chain ratio less than 90 mol%, is used to control tensile stress and flexibility at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a trimellitate plasticizer formed only from straight chain alkyl groups is used, then flexibility at low temperatures is improved, but strength at low temperatures deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the plasticizer by combining trimellitate plasticizers with different alkyl group structures (straight chain and branched chain) in specific ratios. This parameter optimization allows simultaneous achievement of flexibility (through straight chain components) and strength (through branched chain components) at low temperatures, resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite plasticizer system by combining multiple trimellitate plasticizer compounds with different molecular structures. The composite contains both straight chain alkyl groups (providing flexibility) and branched chain alkyl groups (providing strength), allowing the material to exhibit both flexibility and strength at low temperatures simultaneously.
2Ease of operation
If plasticizers are added to improve flexibility, then flexibility at low temperatures is improved, but tensile strength deteriorates
Solution Approach 1:
The patent optimizes the chemical structure parameters of the plasticizer molecules, specifically the ratio of straight chain to branched chain alkyl groups. This structural parameter control enables the plasticizer to provide flexibility enhancement while maintaining tensile strength, overcoming the typical trade-off between these properties.
Solution Approach 2:
The patent introduces different types of plasticizer molecules with distinct local structural characteristics (straight chain vs. branched chain alkyl groups) into the vinyl chloride resin system. Each type performs a specific function: straight chain components provide flexibility while branched chain components maintain strength, achieving local optimization of different properties within the same material system.
Data Source
AI summary
A vinyl chloride resin composition comprises: (a) a vinyl chloride resin; (b) a diester plasticizer formed from a compound represented by the following predetermined formula (1) and (c) a trimellitate plasticizer formed from a compound represented by the following formula (2): where R4, R5, and R6 are alkyl groups that may be the same or different, and a straight chain ratio of each of R4, R5, and R6 is less than 90 mol%.