Coating Agent Aqueous Dispersion for Rubber Sealing
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Solution Overview
Problem
Existing coating agent aqueous dispersions for rubber-made sealing materials fail to balance adhesion, flexibility, and heat resistance, particularly deteriorating rubber materials with low heat resistance when subjected to high temperatures.
Innovation Solution
A coating agent aqueous dispersion comprising 20-80 wt% PTFE, 10-50 wt% acrylic resin, and 10-50 wt% ethylene-vinyl acetate copolymer resin, which provides excellent adhesion and flexibility while preventing rubber deterioration at lower heat treatment temperatures, reducing stickiness, and preventing blooming on the rubber surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature heat treatment (300°C or higher) is applied to achieve sintering of fluoropolymer coating, then coating adhesion and film formation are improved, but rubber materials deteriorate significantly
Solution Approach 1:
The patent changes the temperature parameter from conventional 300°C or higher to 100-200°C, making the heat treatment compatible with heat-sensitive rubber materials while still achieving adequate coating adhesion through the specific binder resin composition
Solution Approach 2:
The patent uses a composite binder resin system comprising polyacrylic acid and polyvinyl alcohol in specific ratios (0.1-10 parts by weight of polyacrylic acid and 1-20 parts by weight of polyvinyl alcohol per 100 parts by weight of fluoropolymer), which enables effective coating adhesion at lower temperatures without damaging rubber materials
2Object-generated harmful factors
If conventional PTFE aqueous dispersion is used to achieve non-stick coating, then low friction and non-stick properties are obtained, but adhesion to rubber surface is insufficient
Solution Approach 1:
The patent introduces binder resins (polyacrylic acid and polyvinyl alcohol) as intermediary substances that form a bonding layer between the fluoropolymer coating and the rubber substrate, improving adhesion while the fluoropolymer maintains its low-friction surface properties
Solution Approach 2:
The patent creates a composite coating system combining fluoropolymer particles (for non-stick properties) with binder resins (for adhesion), achieving both coating adhesion and low friction characteristics simultaneously
3Strength
If coating composition is designed for excellent adhesion, then coating strength is improved, but flexibility of the coating film deteriorates
Solution Approach 1:
The patent optimizes the molecular weight and composition parameters of the binder resins, using polyacrylic acid with specific molecular weight (10,000-1,000,000) and controlling the ratio of polyacrylic acid to polyvinyl alcohol, achieving adequate adhesion while maintaining film flexibility
Solution Approach 2:
The patent creates different functional zones within the coating: the binder resin provides adhesion at the interface with rubber substrate, while the fluoropolymer particles provide low-friction surface properties, with each component performing its specific function locally
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 effectively reduces stickiness and prevents blooming on rubber surfaces, maintaining excellent adhesion and flexibility, and can be applied to various rubber-made sealing materials without causing rubber deterioration, even at lower heat treatment temperatures.
Implementation Method 1
a coating agent aqueous dispersion that is effectively used, for example, as a surface-treating agent for rubber-made sealing materials
Implementation Method 2
can be applied to seal parts... because the heat treatment can be performed at about 180° C. or lower in a short period of time
Data Source
AI summary
A coating agent aqueous dispersion comprising, as solid matters, 20 to 80 wt. %, preferably 29 to 70 wt. %, of PTFE, 10 to 50 wt. %, preferably 14 to 36 wt. %, of acrylic resin, and 10 to 50 wt. %, preferably 20 to 45 wt. %, of ethylene-vinyl acetate copolymer resin. When the coating agent aqueous dispersion of the present invention is used as a surface-treating agent for rubber-made sealing materials, etc., a reduction in stickiness to the sealing mate material and the prevention of blooming on the surface of the rubber material are obtained. Combined with the flexibility, the adhesion balance between the rubber material and the coating agent is excellent.