Silicone Rubber Particle Coating for Smooth High-Load Abrasion Resistance
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Solution Overview
Problem
Existing silicone-based coating agents for rubber materials fail to provide sufficient abrasion resistance under high load and maintain surface smoothness.
Innovation Solution
A coating agent comprising a film-forming resin blended with silicone rubber particles derived from an addition reaction of diorganopolysiloxane, organopolysiloxane resin, and organohydrogen polysiloxane, with specific molar ratios and particle sizes, to enhance abrasion resistance and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spherical silicone rubber particles are blended into an aqueous silicone-based composition, then surface smoothness and matte finish are improved, but abrasion resistance against friction under load remains insufficient
Solution Approach 1:
The invention changes the key parameters of the silicone rubber particles, specifically achieving elongation at break of 100% or more and tensile strength at break of 1.5 MPa or more. These parameter changes transform the particles from brittle spherical structures into highly elastic, durable structures that can withstand friction under load while maintaining surface smoothness.
Solution Approach 2:
The invention creates a composite material system combining film-forming resin with specially designed silicone rubber particles. The composite achieves synergistic effects where the resin provides film formation and the high-performance silicone particles provide both smoothness and exceptional abrasion resistance, resolving the contradiction between these two properties.
2Reliability
If conventional silicone-based coating is applied to rubber surfaces, then water repellency and stain resistance are achieved, but abrasion resistance under high load is insufficient
Solution Approach 1:
The invention fundamentally changes the mechanical parameters of the coating material by using silicone rubber particles with elongation at break ≥100% and tensile strength ≥1.5 MPa. This transformation enables the coating to maintain water repellency properties while simultaneously achieving high abrasion resistance under load, as the highly elastic particles can deform and recover without breaking under stress.
3Ease of operation
If coating film is formed to improve surface smoothness, then slipperiness is enhanced, but adhesion prevention to sealing members becomes insufficient
Solution Approach 1:
The invention changes the elastic properties of the coating particles to achieve elongation at break of 100% or more. This high elasticity creates a compliant surface that provides slipperiness through low friction while simultaneously preventing adhesion to sealing members like O-rings, as the elastic particles can deform to prevent bonding rather than creating a rigid adhesive surface.
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 agent forms films with excellent surface smoothness and abrasion resistance, improving rubber material properties such as slipperiness, abrasion resistance, and preventing adhesion, particularly in applications like weatherstrip rubber.
Implementation Method 1
silicone rubber particles that are an addition reaction product of a curable liquid silicone composition comprising the following components (B-1), (B-2), and (B-3)
Data Source
AI summary
[Problem] An object of the present invention is to provide a coating agent, particularly an aqueous coating agent for rubber, that forms a coating film with excellent surface smoothness and abrasion resistance even against friction under high load. [Solution] A coating agent comprising, (A) a film-forming resin, (B) a silicone rubber particle that is an addition reaction product of a curable liquid silicone composition comprising the following components (B-1), (B-2), and (B-3) : (B-1) a diorganopolysiloxane having two or more alkenyl groups in one molecule; (B-2) an organopolysiloxane resin comprising R13SiO1/2 and SiO4/2 units, wherein the molar ratio of R13SiO1/2 units relative to SiO4/2 units is 0.60 or more to 1.7 or less, R1 is, independently of each other, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 30 carbon atoms and having no alkenyl group, or an alkenyl group having 2 to 8 carbon atoms, and at least one of all the R1 groups is an alkenyl group; and (B-3) an organohydrogen polysiloxane having two or more hydrogen atoms bonded to silicon atoms, referred to as a SiH group, in one molecule; and water, wherein an amount of component (B-2) is 1.0 to 65 parts by mass, relative to 100 parts by mass of the total amount of components (B-1), (B-2), and (B-3), and the mass ratio of component (A) to component (B) is 85:15 to 25:75.