Paint Composition Staining Resistance Segmentation
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Solution Overview
Problem
Existing paint compositions for coated steel sheets fail to provide both immediate and long-term staining resistance, while also ensuring adequate water resistance and bending workability.
Innovation Solution
A paint composition comprising a hydroxyl group-containing resin, a crosslinking agent, a radical copolymer, and an organosilica sol with specific molecular weights and particle diameters, which are combined in specific ratios to form a film that offers immediate staining resistance and maintains it over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a paint composition includes a silicon oxide sol with specified average particle diameter and silane coupling agent modification, then long-term staining resistance is achieved, but the time until staining resistance appears is extended
Solution Approach 1:
The paint composition is segmented into multiple functional components: organosilica sol for long-term durability, radical copolymer for immediate effect, and hydroxyl group-containing resin as base. This segmentation allows each component to perform its specific function at the appropriate time, resolving the contradiction between immediate and long-term staining resistance
Solution Approach 2:
The invention uses a composite material system combining organosilica sol, radical copolymer, and hydroxyl group-containing resin. The composite structure enables synergistic effects where the radical copolymer provides immediate staining resistance while the organosilica sol ensures long-term maintenance, eliminating the time delay issue
2Object-affected harmful factors
If a paint composition uses a surface controlling agent with hydrophilicity to provide staining resistance, then initial staining resistance is achieved, but long-term retention of staining resistance is insufficient
Solution Approach 1:
The radical copolymer with carboxylic acid groups performs preliminary action by providing immediate hydrophilic surface properties and staining resistance upon coating. This preliminary protection is then reinforced and maintained by the organosilica sol component, ensuring long-term retention without sacrificing initial performance
3Reliability
If a paint composition includes polydimethylsiloxane-based copolymer and organosilica sol, then certain paint film properties are achieved, but water resistance and bending workability are unsatisfactory
Solution Approach 1:
The invention changes the chemical parameters of the polymer components by using radical copolymer with specific functional groups (carboxylic acid) and controlled molecular weight (1,000-10,000). This parameter optimization ensures adequate water resistance while maintaining bending workability, resolving the contradiction between overall reliability and specific adaptability
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 paint composition achieves satisfactory water resistance, bending workability, and long-term staining resistance, making it suitable for coated steel sheets.
Implementation Method 1
a silicon oxide sol of which the surface has been modified with a silane coupling agent
Implementation Method 2
a surface controlling agent which provides hydrophilicity
Implementation Method 3
a crosslinking agent (B) which reacts with hydroxyl groups
Data Source
AI summary
Described is a paint composition comprising: a hydroxyl group-containing resin (A); a crosslinking agent (B), which reacts with hydroxyl groups; a radical copolymer (C); and an organosilica sol (D); wherein the radical copolymer (C): (a) has a monomer composition, with respect to the total mass of radically polymerizable monomer, of from 70.0 to 99.8 mass % unsaturated carboxylic acid amide, from 0.2 to 10 mass % radically polymerizable organosiloxane and from 0 to 29.8 mass % other radically polymerizable monomer, (b) is of weight average molecular weight from 1,500 to 15,000, and (c) has a hydroxyl group value of from 10 to 50 mgKOH/g, wherein the organosilica sol (D) is of average particle diameter from 1 to 30 nm, and wherein the solid fraction mass ratio represented by {(C) component+(D) component}/{(A) component+(B) component} is from 3 to 30% and the solid fraction mass ratio represented by {(C) component/(D) component} is from 0.2 to 5.0.