Water-Based Coating Composition for Rubber and Plastic Adhesion
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Solution Overview
Problem
Conventional coating agents for rubber and plastic materials face challenges in achieving sufficient adhesiveness, abrasion resistance, and environmental safety, particularly when used as water-based coatings, as they often require organic solvents and have short working life and poor preservation stability.
Innovation Solution
A water-based coating composition comprising amino group-containing polyorganosiloxane with self-crosslinking properties, chlorinated polyolefin, and water-dispersible polyurethane resin, combined with spherical rubbery elastic particles, which forms a coating film with improved adhesiveness, abrasion resistance, and non-tackness, while being environmentally friendly and having a long working life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic solvent dilution type coating agent is applied to water-base, then water-based coating is achieved, but coating film durability and adhesiveness cannot be obtained
Solution Approach 1:
The patent uses a composite emulsion system combining amino group-containing polyorganosiloxane emulsion with polyurethane emulsion and epoxy resin emulsion. This multi-component composite approach allows the coating to achieve both water-based applicability and excellent film durability/adhesiveness through synergistic interactions between the different polymer components.
Solution Approach 2:
The patent modifies the chemical parameters of the coating composition by incorporating specific functional groups (amino groups, epoxy groups) and controlling molecular weights and compositions of the emulsion components. These parameter changes enable the coating to form durable films with strong adhesiveness while maintaining water-based formulation.
2Reliability
If coating agent contains organoalkoxysilane, then crosslinking and durability are improved, but silane component reacts with isocyanate component and water making water-based formulation difficult
Solution Approach 1:
The patent extracts the problematic organoalkoxysilane component from the formulation and replaces it with amino group-containing polyorganosiloxane that has been pre-emulsified. This extraction eliminates the harmful reactions with isocyanate and water while retaining the beneficial crosslinking and durability properties through alternative siloxane-based crosslinking mechanisms.
Solution Approach 2:
The patent introduces polyurethane emulsion and epoxy resin emulsion as intermediary components that facilitate crosslinking and film formation without requiring organoalkoxysilane. These intermediaries enable durable crosslinked film formation in a water-based system by providing alternative crosslinking pathways that are compatible with water and isocyanate-free formulation.
3Productivity
If conventional silicone based emulsion is used, then water-based coating is achieved, but adhesiveness and abrasion resistance of coating film are not sufficient
Solution Approach 1:
The patent creates a composite emulsion system combining amino group-containing polyorganosiloxane emulsion with polyurethane emulsion and epoxy resin emulsion. This composite approach synergistically enhances both adhesiveness and abrasion resistance while maintaining water-based formulation, overcoming the limitations of conventional single-component silicone emulsions.
Solution Approach 2:
The patent assigns different functional roles to different components of the composite emulsion: amino group-containing polyorganosiloxane provides base material adhesion and water repellancy, polyurethane provides film flexibility and adhesion, and epoxy resin provides crosslinking density and abrasion resistance. This local quality differentiation enables each component to optimize its specific function while contributing to overall coating performance.
4Object-affected harmful factors
If coating agent is made water-based, then environmental safety is improved, but preservation stability and working life become short
Solution Approach 1:
The patent formulates a composite emulsion system where amino group-containing polyorganosiloxane emulsion is combined with polyurethane emulsion and epoxy resin emulsion. This composite structure provides mutual stabilization between components, preventing premature reactions and maintaining preservation stability and working life in a water-based, organic solvent-free formulation.
Solution Approach 2:
The patent designs the emulsion system to be self-stabilizing through proper selection of pH ranges, ionic types, and molecular weight distributions of the component emulsions. The system maintains its own preservation stability and working life without requiring additional stabilizers or preservatives, enabling long-term storage and extended working life in a water-based formulation.
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 coating composition provides a durable, non-tacky, water-repellent film with excellent adhesiveness and abrasion resistance on rubber and plastic surfaces, preventing friction-induced squeak and scratches, and maintaining stability over a wide range of curing conditions without the need for organic solvents.
Implementation Method 1
amino group-containing polyorganosiloxane having self-crosslinking property
Implementation Method 2
improved adhesiveness with base materials composed of a rubber, a plastic
Implementation Method 3
spherical particles made up of a rubbery elastic body mixed and dispersed in the water-based emulsion
Implementation Method 4
having non-tackness, good in water repellancy
Data Source
AI summary
A coating composition contains (A) a water-based emulsion containing (a) amino group-containing polyorganosiloxane having a self crosslinking property, (b) chlorinated polyolefin, and (c) a water dispersible polyurethane resin, and (B) spherical particles made up of a rubbery elastic body mixed and dispersed in the water-based emulsion (A). The water-based emulsion (A) can be obtained by mixing a first emulsion containing the amino group-containing polyorganosiloxane (a), a second emulsion containing the chlorinated polyolefin (b), and the water dispersion of the polyurethane resin (c). The coating composition can form a coating film excellent in preservation stability, coating uniformity, working life, having good non-tackness, water repellancy, lubricity, and excellent in adhesiveness and abrasion resistance.