Coating Agent Composition for Vulcanized Rubber
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Solution Overview
Problem
Existing coating agent compositions for vulcanized rubber-molded products fail to simultaneously satisfy bleeding evaluation, flexibility evaluation by bending test, and adhesion reduction due to bloom from high-temperature and high-humidity tests while maintaining adequate adhesion to vulcanized rubber.
Innovation Solution
A coating agent composition comprising a polytetrafluoroethylene resin emulsion, an urethane resin emulsion, and a hydrogenated NBR emulsion, with optional additions of an acrylic resin emulsion and ethylene-vinyl acetate copolymer resin emulsion, optimized in terms of weight ratios and molecular weights to enhance flexibility, adhesion, and prevent bloom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an urethane resin emulsion is used as a coating agent for vulcanized rubber-molded products, then adhesion to vulcanized rubber is satisfactory, but adhesion reduction due to bloom from high-temperature and high-humidity tests shows unsatisfactory results
Solution Approach 1:
The patent combines multiple resin emulsions (urethane resin emulsion, acrylic resin emulsion, and hydrogenated NBR emulsion) to create a composite coating agent. This composite formulation leverages the adhesion properties of urethane resin while incorporating acrylic and hydrogenated NBR resins that provide resistance to bloom under high-temperature and high-humidity conditions, thereby resolving the contradiction between initial adhesion strength and long-term adhesion stability.
2Strength
If coating agent compositions from Patent Documents 2 and 3 are used, then adhesion to vulcanized rubber shows superior results, but bleeding evaluation, flexibility evaluation by bending test, and adhesion reduction due to bloom show inferior results
Solution Approach 1:
The patent employs a multi-component resin emulsion system where each component contributes specific properties: urethane resin for adhesion, acrylic resin for flexibility and bleeding resistance, and hydrogenated NBR resin for overall coating performance. This composite approach enables the coating agent to simultaneously satisfy adhesion requirements and maintain flexibility, bleeding resistance, and stability under high-temperature and high-humidity conditions.
Solution Approach 2:
The patent optimizes the composition by assigning specific functional roles to different resin components based on their inherent properties. The urethane resin specifically targets adhesion to vulcanized rubber, while the acrylic and hydrogenated NBR resins address flexibility, bleeding resistance, and environmental stability. This functional differentiation within the composite system allows each component to excel at its specific function while contributing to overall performance.
3Strength
If a coating agent composition is optimized for adhesion, then adhesion test results improve, but bleeding evaluation, flexibility by bending test, and adhesion reduction due to bloom deteriorate
Solution Approach 1:
The patent creates a balanced composite coating agent where the urethane resin emulsion provides adhesion while acrylic resin emulsion and hydrogenated NBR emulsion provide compositional stability. The specific formulation ratios and component selection ensure that the coating maintains its integrity under bleeding tests, bending tests, and high-temperature high-humidity exposure, preventing the trade-off between adhesion strength and compositional stability.
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 composition effectively satisfies bleeding evaluation, flexibility, and adhesion reduction due to bloom in high-temperature and high-humidity tests without impairing adhesion to vulcanized rubber, suitable for various rubber products including seals, rolls, and hoses, offering low friction and abrasion resistance.
Implementation Method 1
evaluation of adhesion to vulcanized rubber by an adhesion test
Implementation Method 2
comprising (A) a polytetrafluoroethylene resin emulsion, (B) an urethane resin emulsion, and (C) a hydrogenated NBR emulsion
Implementation Method 3
evaluation of adhesion to vulcanized rubber due to bloom from the rubber by a high-temperature and high-humidity test
Implementation Method 4
bleeding evaluation (70°C, 30 days)
Implementation Method 5
evaluation of the flexibility of the coating agent by a bending test
Implementation Method 6
evaluation of adhesion to vulcanized rubber due to bloom from the rubber by a high-temperature and high-humidity test
Implementation Method 7
offering low friction and abrasion resistance
Implementation Method 8
offering low friction and abrasion resistance
Data Source
AI summary
Disclosed is a coating agent composition comprising (A) a polytetrafluoroethylene resin emulsion, (B) an urethane resin emulsion, and (C) a hydrogenated NBR emulsion, and preferably further comprising (D) an acrylic resin emulsion and/or an ethylene-vinyl acetate copolymer resin emulsion. When this coating agent composition is used as a surface coating agent for general vulcanized rubber-molded products, evaluation of adhesion to rubber by an adhesion test is hardly impaired, and bleeding evaluation, evaluation of the flexibility of the coating agent by a bending test, and evaluation of the reduction in adhesion to rubber due to bloom from the rubber by a high-temperature and high-humidity test are all satisfied.