Epichlorohydrin Fluororubber Laminate Adhesion
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Solution Overview
Problem
Existing vulcanization-bonded laminates of epichlorohydrin rubber and fluororubber face challenges in achieving both high adhesiveness and workability, as additives often lead to shorter scorching times and increased burning risks during processing.
Innovation Solution
A laminate structure comprising an epichlorohydrin rubber layer with magnesium oxide, polythiol vulcanizing agent, 1,8-diazabicyclo (5,4,0) undecene-7 or its salts, organic phosphonium salts, and maleic anhydride modified polybutadiene, combined with a fluororubber layer, where the polythiol vulcanizing agent and maleic anhydride modified polybutadiene are used within specific weight ratios to enhance adhesiveness and scorching time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additives are compounded to epichlorohydrin rubber to improve adhesiveness with fluororubber, then adhesiveness is improved, but scorching time becomes shorter and burning occurs easily during kneading, storage, and molding
Solution Approach 1:
The invention changes the chemical parameters of the epichlorohydrin rubber composition by incorporating specific compounds (1,8-diazabicyclo (5,4,0) undecene-7 or its salts, organic phosphonium salts, and maleic anhydride modified polybutadiene) in controlled amounts. This modifies the rubber's chemical properties to enhance adhesiveness with fluororubber while maintaining appropriate scorching time and workability during processing.
Solution Approach 2:
The invention creates a composite rubber composition by combining epichlorohydrin rubber with multiple functional additives that work synergistically. The combination of 1,8-diazabicyclo (5,4,0) undecene-7 (or its salts), organic phosphonium salts, and maleic anhydride modified polybutadiene forms a composite system that achieves both high adhesiveness and acceptable workability.
2Strength
If 1,8-diazabicyclo (5,4,0) undecene-7 and epoxy resin are compounded to improve adhesiveness, then adhesiveness is improved, but scorching time cannot be satisfied due to polymerization reaction
Solution Approach 1:
The invention extracts the essential adhesive-promoting function from the 1,8-diazabicyclo (5,4,0) undecene-7 + epoxy resin combination and isolates it by using 1,8-diazabicyclo (5,4,0) undecene-7 (or its salts) alone in controlled amounts. This removes the harmful polymerization reaction between the base and epoxy resin while retaining the adhesive enhancement effect on the epichlorohydrin rubber.
Solution Approach 2:
The invention introduces organic phosphonium salts and maleic anhydride modified polybutadiene as intermediary substances that mediate between the 1,8-diazabicyclo (5,4,0) undecene-7 (or its salts) and the epichlorohydrin rubber. These intermediaries facilitate adhesive bonding while controlling the reaction rate to prevent excessive scorching.
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 provides a strongly bonded laminate with improved adhesiveness and workability, suitable for applications like fuel hoses, while maintaining resistance to burning during processing and reducing manufacturing costs.
Implementation Method 1
it has become known that adhesiveness can be improved by compounding an acid acceptor such as magnesium oxide
Implementation Method 2
polythiol vulcanizing agent
Implementation Method 3
1,8-diazabicyclo (5,4,0) undecene-7, etc., which is a strong base
Implementation Method 4
maleic anhydride modified polybutadiene
Data Source
AI summary
Provide a laminate constituted by epichlorohydrin rubber layer and fluororubber layer that are strongly vulcanization-bonded together. A rubber laminate constituted by vulcanization-bonding an epichlorohydrin rubber layer that contains at least (a) magnesium oxide, (b) polythiol vulcanizing agent, (c) at least one type of compound selected from 1,8-diazabicyclo (5,4,0) undecene-7,1,5-diazabicyclo (4,3,0) nonene-5, and salts thereof, (d) at least one type of compound selected from organic phosphonium salts and organic ammonium salts, and (e) maleic anhydride modified polybutadiene, and a fluororubber layer; wherein such rubber laminate is characterized in that: the content of the polythiol vulcanizing agent (b) in the epichlorohydrin rubber layer is 0.3 to 1.2 parts by weight per 100 parts by weight of the epichlorohydrin rubber; and the content of the maleic anhydride modified polybutadiene (e) in the epichlorohydrin rubber layer is 0.3 to 1.5 parts by weight per 100 parts by weight of the epichlorohydrin rubber.