Copolymer Additive for Weather and Water Resistance in Coatings
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Solution Overview
Problem
Existing aqueous coating materials face challenges in achieving both good weather resistance and water resistance due to issues like aggregation of high weather resistance substances, volatility of low molecular weight stabilizers, and impairment of water resistance from emulsifiers used in emulsion polymerization.
Innovation Solution
A copolymer containing specific structural units, represented by Formulas (1) and (2), is used as an additive to enhance weather resistance and water resistance, with preferred compositions and starting monomers that improve the copolymer's effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicon compound or fluorine compound is added to an aqueous dispersion of a synthetic resin to improve weather resistance, then weather resistance is improved, but the substance aggregates or settles making the improvement ineffective
Solution Approach 1:
The patent uses a copolymer composite containing both a synthetic resin component (for base coating properties) and a weather resistance component (silicon or fluorine compound) integrated into the polymer structure. This composite approach allows the weather resistance substance to be uniformly distributed and stabilized within the resin matrix, preventing aggregation and settling while maintaining excellent weather resistance performance.
2Reliability
If a low molecular weight weather resistance improver such as ultraviolet absorber or hindered amine-type light stabilizer is added to a resin, then weather resistance is improved, but the improver volatilizes and bleeds out readily
Solution Approach 1:
The patent changes the molecular weight parameter of the weather resistance improver from low to high by using a polymerized form. The weather resistance functional groups (ultraviolet absorber or hindered amine-type light stabilizer) are incorporated into a polymer chain, increasing molecular weight and thereby reducing volatilization and bleed-out while maintaining weather resistance effectiveness.
Solution Approach 2:
The patent uses a polymer chain as an intermediary carrier to deliver the weather resistance functional groups. Instead of adding small molecule stabilizers directly to the resin, they are embedded within a polymer structure that acts as a mediator, preventing direct volatilization while allowing the functional groups to perform their weather protection function.
3Stability of the object's composition
If a large amount of dispersant is used in the dispersion to maintain stability, then dispersion stability is improved, but water resistance deteriorates
Solution Approach 1:
The patent extracts and eliminates the need for large amounts of external dispersant by incorporating the dispersion function directly into the copolymer structure. The copolymer itself provides steric stabilization through its molecular structure, removing the harmful dispersant component while maintaining dispersion stability.
4Ease of manufacture
If an emulsifier is used for emulsion polymerization to produce the copolymer, then the copolymer can be synthesized, but water resistance is impaired
Solution Approach 1:
The patent uses a minimal amount of emulsifier only during the polymerization process as a temporary aid, then removes or degrades it in the final product. The emulsifier serves its purpose during manufacturing but is not present in significant quantities in the final coating, thus enabling synthesis while minimizing water resistance impairment.
Data Source
AI summary
The present invention is a copolymer containing, as essential structural units, unit A represented by Formula (1) and unit B represented by Formula (2):(wherein R1 and R4 each independently represent a hydrogen atom or a methyl group, and R2 and R3 each independently represent a hydrogen atom or a C1-20 hydrocarbon group, excluding cases where two or more groups of R1 to R3 are hydrogen atoms.)(wherein R5 represents a hydrogen atom or a methyl group, and R6 represents a group selected from the group consisting of C1-20 hydrocarbon groups optionally containing an oxygen atom, C1-20 alkoxy groups, hydrogen atoms, oxygen radicals and hydroxyl groups.)