Polymeric Siloxane Binder for Solvent-Free Metal Coatings
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Solution Overview
Problem
Existing coating compositions for metal surfaces face challenges with the liberation of volatile substances during curing, lack of temperature resistance, and inadequate corrosion protection, particularly in aqueous formulations that are not environmentally friendly.
Innovation Solution
An aqueous, film-forming polymeric siloxane binder with low alkoxy content, which is water-soluble and free of organic solvents, allowing for stable and efficient coating formation without the use of emulsifying agents or acids, and can be adjusted for various curing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional siloxane-polymer resins or silicone resin emulsions are used as binders, then coating formation is achieved, but volatile substances are liberated during drying and curing
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by using polymeric siloxanes with specific structural characteristics (average molecular weight 500-5000, specific Si-O-Si bond content) that enable film formation without requiring organic solvents or emulsifiers, thereby eliminating volatile substance liberation during curing
Solution Approach 2:
The invention replaces conventional binders that require volatile solvents and emulsifying agents with a water-soluble polymeric siloxane binder that forms stable films without these additives, eliminating the need for substances that would be liberated as volatiles during processing
2Adaptability or versatility
If pre-hydrolized silanes with emulsifying agents are used, then aqueous anti-corrosive agent is achieved, but temperature resistance is poor above 120°C
Solution Approach 1:
The invention changes the molecular weight and structural parameters of the siloxane polymer to create a binder that maintains film integrity at elevated temperatures. The specific molecular weight range (500-5000) and structural characteristics prevent the plasticizing effect that occurs with conventional emulsifiers at temperatures above 120°C
Solution Approach 2:
The invention extracts and eliminates emulsifying agents from the formulation by using water-soluble polymeric siloxanes that inherently form stable films without requiring tensides or other emulsifiers, thereby preventing the temperature-related plasticizing effect and maintaining coating stability above 120°C
3Ease of operation
If organic solvents are used in anti-corrosive agents, then processibility is improved, but environmental compliance and corrosion protection are compromised
Solution Approach 1:
The invention changes the solvent system from organic to aqueous by using water-soluble polymeric siloxanes with specific molecular weight and structural parameters, maintaining excellent processibility and film formation while eliminating organic solvent emissions and improving environmental compliance and corrosion protection
Solution Approach 2:
The invention inverts the conventional approach by making the binder itself water-soluble through specific polymeric siloxane structure design, rather than using water-miscible organic solvents, thereby achieving environmental compliance without sacrificing processibility
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 binder provides stable, environmentally friendly coatings that are free of organic solvents, reduce alcohol liberation during curing, and offer improved corrosion protection and temperature resistance, enabling flexible application in various thicknesses and layer structures.
Implementation Method 1
pre-hydrolized inorganic alkyl-silicate-compound
Implementation Method 2
formation of a siloxane condensate
Data Source
AI summary
The invention relates to a binding agent comprising an aqueous, film-forming, polymeric siloxane. The invention also relates to a coating agent that is produced using said binding agent and to a workpiece that is coated with said coating agent.