Crosslinked Polymer Nanoparticles for Vinyl Chloride Foam Molding
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Solution Overview
Problem
Vinyl chloride resins exhibit poor foam molding properties due to insufficient elongation, melt strength, and non-uniform foaming cell size, which are not adequately addressed by existing methods involving methyl methacrylate and alkyl acrylate-based additives.
Innovation Solution
A crosslinked polymer nanoparticle-containing composition is developed, comprising 2-20% crosslinked polymer nanoparticles with an average size of 40-100 nm and 80-98% vinyl-based copolymer, which is added to the vinyl chloride resin to enhance foam molding properties through sequential polymerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vinyl chloride resin is foam-molded alone, then it provides basic structural properties, but it cannot have sufficient elongation and melt strength, resulting in poor appearance and non-uniform foaming cell size
Solution Approach 1:
The patent uses a composite material system consisting of vinyl chloride resin combined with a specifically formulated copolymer containing methyl methacrylate (30-70 wt%), alkyl acrylate (10-40 wt%), and vinyl cyanide (10-30 wt%). This composite approach allows the copolymer to provide sufficient elongation and melt strength while the vinyl chloride resin provides structural integrity, resulting in uniform foaming cell size and improved appearance without sacrificing basic structural properties
Solution Approach 2:
The patent optimizes the glass transition temperature (Tg) of the copolymer to be -20°C to 0°C, which is a critical parameter change that enables the material to provide adequate melt strength and elongation during foam molding. Additionally, the copolymer composition ratios are precisely controlled (methyl methacrylate 30-70 wt%, alkyl acrylate 10-40 wt%, vinyl cyanide 10-30 wt%) to achieve the desired balance between processibility and foaming uniformity
2Strength
If additives such as methyl methacrylate and foaming agents are added to vinyl chloride resin, then elongation and melt strength are improved, but processibility and uniformity of foamed cells remain insufficient
Solution Approach 1:
The patent adjusts the glass transition temperature (Tg) of the copolymer to a specific range (-20°C to 0°C) and controls the composition ratios of methyl methacrylate (30-70 wt%), alkyl acrylate (10-40 wt%), and vinyl cyanide (10-30 wt%). These parameter changes optimize both melt strength for foam formation and processibility for manufacturing, while also ensuring uniform foamed cell structure
Solution Approach 2:
The patent creates a multi-component copolymer composite that combines methyl methacrylate for melt strength, alkyl acrylate for processibility enhancement, and vinyl cyanide for structural stability. This composite material provides all three required properties (elongation, melt strength, and processibility) simultaneously, eliminating the need for separate additives
3Reliability
If existing processing aids including methyl methacrylate are added to vinyl chloride resin, then some foam molding properties are improved, but processibility and foaming properties do not meet requirements
Solution Approach 1:
The patent employs a tri-component copolymer composite (methyl methacrylate, alkyl acrylate, and vinyl cyanide) where each component contributes specific properties. The alkyl acrylate component specifically addresses uniformity of foamed cells while methyl methacrylate provides foaming properties and vinyl cyanide ensures structural stability, achieving both high reliability and manufacturing precision simultaneously
Solution Approach 2:
The patent precisely controls the glass transition temperature (Tg) of the copolymer to be -20°C to 0°C and maintains specific composition ratios (methyl methacrylate 30-70 wt%, alkyl acrylate 10-40 wt%, vinyl cyanide 10-30 wt%). These parameter changes ensure uniform nucleation and growth of foam cells, resulting in high uniformity of foamed cell structure while maintaining excellent foaming properties
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 improves the foam molding properties and processibility of vinyl chloride resins by providing uniform foaming and reduced cell size, thereby enhancing the quality of molded products.
Implementation Method 1
preparing a latex of crosslinked polymer nanoparticles having an average particle size of 40 to 100 nm by polymerizing 95 to 99.8% by weight of a vinyl monomer and 0.2 to 5% by weight of a crosslinking agent
Implementation Method 2
adding 2 to 20% by weight of the latex of crosslinked polymer nanoparticles to a monomer mixture consisting of 10 to 70% by weight of an alkyl (meth)acrylate monomer, 12 to 72% by weight of an aromatic vinyl monomer, and 6 to 36% by weight of a vinyl cyanide monomer, and then sequentially polymerizing the mixture
Data Source
AI summary
Disclosed is a crosslinked polymer nanoparticle containing composition, a method for preparing a copolymer using the composition, and a vinyl chloride resin with improved foam molding properties. Processing aid in according with the present invention, provides the effects of improved foam molding properties and processibility of a vinyl chloride resin, during a foam molding process upon being added to the vinyl chloride resin.