(Meth)acrylic Polymer Particles for Plastisol Storage Stability
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Solution Overview
Problem
Conventional acrylic plastisols face challenges in maintaining storage stability, chipping resistance, and flexibility, particularly at elevated temperatures, and tend to have high material costs due to the use of high-cost (meth)acrylic polymer particles and adhesives, which also affect their anti-sagging properties.
Innovation Solution
Development of (meth)acrylic polymer particles with specific solubility parameters and glass transition temperatures, combined with a suitable plasticizer composition, to enhance storage stability and chipping resistance while reducing adhesive content, and incorporating functional monomers to improve adhesion and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large amount of adhesive is compounded to improve adhesive properties and chipping resistance, then adhesive strength is improved, but stringiness and sagging occur during coating
Solution Approach 1:
The invention changes the chemical composition parameters of the polymer particles by incorporating specific functional monomers (carboxyl group-containing, hydroxyl group-containing, or amino group-containing monomers) in controlled amounts (0.1-10 mass% based on total monomers). This modifies the polymer's chemical properties to enhance adhesive characteristics without requiring excessive adhesive additives, thereby avoiding sagging and stringiness during coating operations.
Solution Approach 2:
The invention creates composite polymer particles by copolymerizing multiple monomer types including (meth)acrylate monomers for base properties and functional monomers for adhesive properties. This composite structure integrates multiple functions within the polymer itself, reducing dependence on separate adhesive additives and improving coating processability while maintaining strength.
2Quantity of substance
If the content of adhesives is reduced to lower material costs, then cost is reduced, but adhesive properties and chipping resistance are lowered
Solution Approach 1:
The invention modifies the polymer composition by incorporating functional monomers with adhesive-functional groups (carboxyl, hydroxyl, or amino groups) in optimized quantities. This changes the chemical parameters of the polymer to provide inherent adhesive properties, allowing reduction of separate adhesive additives while maintaining or improving chipping resistance.
Solution Approach 2:
The polymer particles themselves provide adhesive functionality through incorporated functional groups, making the polymer self-adhesive. This eliminates or reduces the need for separate adhesive additives, achieving cost reduction while maintaining adhesive properties and chipping resistance.
3Stability of the object's composition
If polymer particles with high glass transition temperature are used to improve storage stability, then storage stability is improved, but flexibility of coating films is reduced
Solution Approach 1:
The invention uses a core-shell structure where the core contains polymer with high glass transition temperature for storage stability, while the shell contains polymer with appropriate glass transition temperature for flexibility. This spatial differentiation of properties allows simultaneous achievement of storage stability and film flexibility.
Solution Approach 2:
The invention creates composite polymer particles combining different monomer units with complementary properties. The composite structure integrates high-Tg components for storage stability with lower-Tg components and functional monomers for flexibility, achieving both requirements in a single material system.
Data Source
AI summary
Disclosed are an industrially useful (meth)acrylic polymer particle for use in a plastisol which is excellent in storage stability, particularly under circumstance at 40°C or above, so that it can suppress gelation and maintain a sol state during storage and which can give a shaped article excellent in flexibility and chipping resistance; a method for producing the (meth)acrylic polymer particle; and a plastisol composition made from the (meth)acrylic polymer particle. Specifically disclosed is a method for producing a (meth)acrylic polymer particle, which comprises polymerizing a monomer or monomer mixture (B) to form a polymer (b) in the presence of a polymer (a) obtained by polymerization of a monomer or monomer mixture (A), wherein a glass transition temperature (Tg) of the polymer (a) as calculated from the FOX equation is 90°C or above, a solubility parameter of the polymer (a) is 19.90 (J/cm3)1/2 or below, and a solubility parameter of the polymer (b) is 20.22 (J/cm3)1/2 or above.