Aqueous Surface-Treating Agent for Aluminum Corrosion Resistance
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Solution Overview
Problem
Existing aqueous surface-treating agents for aluminum substrates lack sufficient corrosion resistance in salt water environments, despite providing sticking prevention and adhesiveness to seal members.
Innovation Solution
An aqueous surface-treating agent comprising silicone oil, silanol-modified polyurethane resin, silane compounds, hydrazide and carbonyl group-containing polyurethane resin, and a polyurethane resin with a glass transition temperature of −30° C. or lower and thermal softening temperature of 70° C. or lower, which enhances coating film hardness and adhesiveness, thereby improving corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone oil and silanol-modified polyurethane resin are used to prevent sticking and provide adhesiveness, then sticking prevention and adhesion to seal members are improved, but corrosion resistance in salt water environments deteriorates
Solution Approach 1:
The patent applies composite materials by combining multiple polyurethane resin components with different functions: (B) silanol-modified polyurethane resin for adhesion, (D) carbonyl group-containing polyurethane resin for crosslinking, and (E) polyurethane resin with low glass transition temperature for flexibility. This composite resin system maintains sticking prevention and adhesion while significantly improving corrosion resistance in salt water environments.
Solution Approach 2:
The patent changes the chemical and physical parameters of the polyurethane resin system by controlling the glass transition temperature (≤−30°C) and thermal softening temperature (≤70°C) of component (E), and by specifying the molecular weight ranges and functional group contents of components (B) and (D). These parameter changes enable the coating to maintain flexibility and adhesion while providing superior corrosion protection.
2Reliability
If polyurethane resin content is increased to improve adhesion without silicone oil bleeding, then adhesion and durability are improved, but the coating film becomes too hard and loses flexibility to follow substrate surface
Solution Approach 1:
The patent applies local quality by creating different functional zones within the coating film through the use of multiple polyurethane resin components. Component (B) provides adhesion at the substrate interface, component (D) forms crosslinked networks for durability, and component (E) provides flexibility in the bulk coating. This spatial differentiation of properties allows the coating to simultaneously achieve high adhesion and appropriate flexibility.
Solution Approach 2:
The patent applies dynamics by formulating the coating with polyurethane resin (E) having a glass transition temperature of −30°C or lower and thermal softening temperature of 70°C or lower. This enables the coating film to dynamically adjust its hardness and flexibility in response to temperature changes and mechanical stress, allowing it to follow the substrate surface while maintaining durability.
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 solution significantly enhances the corrosion resistance and sealing properties of aluminum substrates in salt water tests by ensuring the coating film follows the surface of mating materials, preventing corrosion and improving durability.
Implementation Method 1
a silane compound and/or a partial hydrolysate thereof
Implementation Method 2
the silane compound represented by the following general formulae: (where R1 and R2 are each independent alkyl group having 1-4 carbon atoms, n and m each satisfies 1≤n≤3 and m=3−n) and/or a partial hydrolyzate thereof
Implementation Method 3
comprising (A) an aqueous emulsion of silicone oil, (B) a silanol-modified polyurethane resin, (D) an aqueous emulsion of a hydrazide and a carbonyl group-containing polyurethane resin, and (E) an aqueous emulsion of a polyurethane resin
Data Source
AI summary
An aqueous surface-treating agent comprising (A) an aqueous emulsion of silicone oil, (B) a silanol-modified polyurethane resin, (C) a silane compound and/or a partial hydrolysate thereof, (D) an aqueous emulsion of a hydrazide and a carbonyl group-containing polyurethane resin, and (E) an aqueous emulsion of a polyurethane resin having a glass transition temperature of −30° C. or lower, and a thermal softening temperature of 70° C. or lower measured by using a flow tester when heated from 40° C. to 150° C. at a heating rate of 5° C./min. The aqueous surface-treating agent contains silicone oil for preventing sticking between products and a silanol-modified polyurethane resin binder having a low hardness and excellent adhesiveness to seal members, and improves the corrosion resistance of an aqueous surface-treating agent for aluminum substrates etc.