Vinyl Chloride Resin Composition for Powder Fluidity and Uniform Molding
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Solution Overview
Problem
Existing vinyl chloride resin compositions exhibit poor powder fluidity, leading to non-uniformity in thickness and density in molded products, particularly in applications like automobile instrument panels, which affects their suitability as surface skins.
Innovation Solution
A vinyl chloride resin composition containing specific amounts of a plasticizer and a uracil compound, such as 6-amino-1,3-dimethyluracil, enhances powder fluidity and inhibits yellowing during high-temperature molding, resulting in a balanced composition that can be easily molded into uniform products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a vinyl chloride resin composition contains only a vinyl chloride resin and a plasticizer, then the composition is simple and easy to manufacture, but the powder fluidity is poor leading to non-uniform molded products
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a uracil compound at specific concentrations (0.01-5 parts by mass per 100 parts of vinyl chloride resin) to improve powder fluidity and achieve uniform molded products
Solution Approach 2:
The patent creates a composite material system combining vinyl chloride resin, plasticizer, and uracil compound where the uracil compound acts as a fluidity enhancer, achieving both improved manufacturing precision and controlled composition complexity
2Manufacturing precision
If the plasticizer content is increased to improve powder fluidity, then the molded product uniformity improves, but the composition becomes more complex and harder to control
Solution Approach 1:
The patent optimizes the plasticizer content parameter to a specific range (50-200 parts by mass per 100 parts of vinyl chloride resin) and combines it with the uracil compound to achieve the desired powder fluidity and thickness uniformity while maintaining ease of manufacture
3Productivity
If the vinyl chloride resin composition is molded at high temperature to improve productivity, then the molding speed increases, but yellowing occurs during the molding process
Solution Approach 1:
The uracil compound acts as an intermediary substance that mediates between the high temperature molding process and the vinyl chloride resin, enabling high-temperature processing for improved productivity while preventing yellowing through the uracil compound's protective effect
Data Source
AI summary
Provided is a vinyl chloride resin composition having excellent powder fluidity. The vinyl chloride resin composition contains a vinyl chloride resin, a plasticizer, and a uracil compound. The content of the plasticizer is not less than 50 parts by mass and not more than 200 parts by mass relative to 100 parts by mass of the vinyl chloride resin, and the content of the uracil compound is not less than 0.05 parts by mass and not more than 3.00 parts by mass relative to 100 parts by mass of the vinyl chloride resin.