Fluorosilicone Rubber Laminate Primer Split for Stronger Adhesion

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Solution Overview

Problem

Fluorosilicone rubber compositions do not adhere effectively to substrates such as metals and plastics due to the limitations of existing primer compositions that simultaneously contain platinum-based catalysts and silicon atom-bonded hydrogen atoms, leading to inadequate adhesion.

Innovation Solution

A method of producing a fluorosilicone rubber laminate involving a primer composition that either contains a platinum-based catalyst or a fluorosiloxane with silicon atom-bonded hydrogen atoms, but not both, combined with a fluorosilicone rubber composition containing a platinum-based catalyst and/or a fluorosiloxane with silicon atom-bonded hydrogen atoms, to enhance adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a primer composition simultaneously contains a platinum-based catalyst and a fluorosiloxane with silicon atom-bonded hydrogen atoms, then the adhesion between fluorosilicone rubber and substrate is expected to be improved, but the dehydrogenation reaction of silicon atom-bonded hydrogen atoms occurs, preventing adhesion improvement

Engineering Contradiction:

ImproveadhesionVSAvoiddehydrogenation reaction

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The invention divides the primer composition into two separate compositions: a first primer composition containing a platinum-based catalyst without silicon atom-bonded hydrogen atoms, and a second primer composition containing a fluorosiloxane with silicon atom-bonded hydrogen atoms without a platinum-based catalyst. This segmentation prevents the harmful dehydrogenation reaction while maintaining the adhesion benefits of both components when applied in sequence.

Inventive Principle:

Principle #1Segmentation

2Strength

If existing primer compositions are used to adhere fluorosilicone rubber to substrates, then adhesion is attempted, but the adhesion cannot be improved to an extent expected

Engineering Contradiction:

ImproveadhesionVSAvoidadhesion performance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The invention applies the first primer composition containing the platinum-based catalyst to the substrate before applying the fluorosilicone rubber composition. This preliminary action prepares the substrate surface with catalytic activity, enabling subsequent effective adhesion when the fluorosilicone rubber is applied and cured, thereby achieving the expected adhesion improvement.

Inventive Principle:

Principle #10Preliminary action

3Strength

If fluorosilicone rubber composition is cured after contact with primer composition, then adhesion is achieved, but significantly improving adhesion between fluorosilicone rubber and substrate is difficult

Engineering Contradiction:

ImproveadhesionVSAvoidadhesion improvement difficulty

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The invention changes the chemical parameters of the primer composition by separating the platinum-based catalyst and fluorosiloxane with silicon atom-bonded hydrogen atoms into different compositions. The first primer composition contains the catalyst at a controlled concentration, and the second contains the fluorosiloxane, allowing optimized curing conditions and significantly improved adhesion between fluorosilicone rubber and substrate.

Inventive Principle:

Principle #35Parameter changes

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 method results in a fluorosilicone rubber laminate with improved adhesion between the fluorosilicone layer and the substrate, enhancing properties like oil resistance, fuel resistance, and heat resistance.

Implementation Method 1

the fluorosilicone rubber composition contains a platinum-based catalyst and/or a fluorosiloxane containing a silicon atom-bonded hydrogen atom; the primer composition contains a platinum-based catalyst or a fluorosiloxane containing a silicon atom-bonded hydrogen atom

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

the adhesion could not be improved to an extent expected due to a dehydrogenation reaction of the silicon atom-bonded hydrogen atom and the like

Methodology Applied

Scientific EffectDehydrogenation reaction:

Data Source

PatentUS12497537B2Method of producing fluorosilicone rubber laminate, and fluorosilicone rubber laminate

Publication Date: 2025.12.16 DOW TORAY CO LTD

AI summary

Provided is a method of producing a fluorosilicone rubber laminate. The method comprises: (1) applying a primer composition onto a substrate, and forming a primer layer on a surface of the substrate; and (2) bringing a fluorosilicone rubber composition into contact with the primer layer, and adhering a fluorosilicone rubber to the primer layer. The fluorosilicone rubber composition comprises a platinum-based catalyst and/or a fluorosiloxane containing a silicon atom-bonded hydrogen atom. The primer composition comprises a platinum-based catalyst or a fluorosiloxane containing a silicon atom-bonded hydrogen atom, however the primer composition does not simultaneously comprise a platinum-based catalyst and a fluorosiloxane containing a silicon atom-bonded hydrogen atom. Either the primer composition or the fluorosilicone rubber composition comprises a platinum-based catalyst or a fluorosiloxane containing a silicon atom-bonded hydrogen atom. A laminate in which a fluorosilicone rubber layer and a base material are favorably adhered to each other can be obtained.