Copolymer Surface Conditioner for Coating Agents
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Solution Overview
Problem
Current surface conditioners for coating agents either compromise on base material-wetting property, cissing-preventing property, leveling property, heat resistance, or adhesion of over-coating, often due to limitations in surface tension, thermal stability, and compatibility with coating agents.
Innovation Solution
A copolymer composed of acrylate monomers with a siloxy group, N-vinyllactam monomers, and alkyl (meth)acrylate monomers, with a specific weight ratio and molecular weight range, is developed to enhance base material-wetting, cissing-preventing, leveling, and heat-resistant properties while maintaining compatibility and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If silicone-type surface conditioner is used to achieve low surface tension and excellent base material-wetting property, then the base material-wetting property and leveling property are improved, but the adhesion of over-coating is disturbed
Solution Approach 1:
The patent uses a copolymer comprising a polyether-modified polysiloxane unit and a polymer unit formed by polymerization of unsaturated monomers. This composite structure combines the low surface tension and wetting properties of silicone with the adhesion and heat resistance of polymer structures, resolving the contradiction between wetting performance and over-coating adhesion.
2Stability of the object's composition
If silicone-type surface conditioner with polyether structure is used to achieve low surface tension, then the base material-wetting property is improved, but the heat resistance is insufficient due to thermal decomposition
Solution Approach 1:
The copolymer combines polyether-modified polysiloxane units (providing low surface tension and wetting) with polymer units formed from unsaturated monomers (providing heat resistance). This composite structure maintains wetting performance while achieving the required heat resistance for baking-finish-coating.
Solution Approach 2:
The patent specifies that the copolymer must have a weight average molecular weight of 10,000 to 1,000,000 and a glass transition temperature of -50°C to 0°C. By controlling these parameters, the surface conditioner achieves both low surface tension for wetting and thermal stability for heat resistance.
3Reliability
If polymer-type surface conditioner is used to achieve high heat resistance and good adhesion, then the heat resistance and adhesion are improved, but the base material-wetting property is insufficient due to higher surface tension
Solution Approach 1:
The copolymer integrates polyether-modified polysiloxane units (providing low surface tension for wetting) with polymer units formed from unsaturated monomers (providing heat resistance and adhesion). This composite structure simultaneously achieves wetting performance and thermal stability.
4Reliability
If polymer-type surface conditioner is used to achieve high heat resistance, then the heat resistance is improved, but the cissing-preventing property is insufficient due to contamination
Solution Approach 1:
The copolymer structure with polyether-modified polysiloxane units provides both heat resistance and improved cissing-preventing properties. The polysiloxane component reduces surface tension and improves wetting, preventing contamination and cissing while maintaining thermal stability.
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 copolymer-based surface conditioner improves the smoothness, adhesion, and heat resistance of coating layers, preventing cissing and ensuring even coating, even under high-temperature baking conditions, while maintaining compatibility with coating agents.
Implementation Method 1
The coating agent blended with the silicone-type surface conditioner shows an excellent base material-wetting property resulted from its low surface tension
Implementation Method 2
the surface conditioner is thermally decomposed due to the insufficient heat resistance attributed to the polyether structure thereof, and thus cissing or protruded humps may be generated by contraries
Data Source
AI summary
It is an object of the present invention to provide a surface conditioner for a coating agent. The surface agent, which is blended into the coating agent in small amounts, can impart a base material-wetting property and a cissing-preventing property to the coating agent when blended in the coating agent, can impart a leveling property to the coating layer which the coating agent is applied to form a coating layer so as to improve the appearance and smoothness of the surface thereof, can improve an adhesion property of over-coating, can impart an excellent leveling property with heat resistance to the coating agent when blended in a baking paint which is cured at a high temperature. It is another object of the present invention to provide a coating agent to which said surface conditioner is blended. The surface conditioner for the coating agent comprises: a copolymer composed of 1 to 40 parts by weight of an acrylate monomer (A) having a siloxy group, 2 to 80 parts by weight of an N-vinyllactam monomer (B), and 10 to 97 parts by weight of an alkyl (meth)acrylate monomer (C) of which an alkyl group has 1 to 12 carbon atoms; and weight average molecular weight of the copolymer is 1000 to 120000.