GRP Strand Sizing With Two-Bath Adhesion for Wet Durability
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Solution Overview
Problem
Existing processes for adhering glass-reinforced plastics (GRPs) to elastomer matrices require the use of adhesives that have a negative environmental impact and do not maintain high adhesion under wet conditions or temperature variations.
Innovation Solution
A process involving a pre-bonding step with an epoxy and blocked diisocyanate followed by a second bath of an aqueous adhesive composition containing specific compounds A1 and A2, with a limited amount of blocked diisocyanate, to enhance adhesion and resistance to wet conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aqueous adhesive compositions with blocked diisocyanate are used to adhere GRP strands to elastomer matrices, then adhesion is improved, but environmental impact worsens due to harmful chemicals
Solution Approach 1:
The patent changes the chemical parameters of the adhesive composition by replacing blocked diisocyanate with alternative compounds that provide similar adhesion performance without the harmful environmental effects. This involves modifying the chemical composition while maintaining the functional performance of the adhesive system.
2Device complexity
If conventional adhesive compositions are used without pre-bonding treatment, then process complexity is reduced, but adhesion under wet conditions deteriorates
Solution Approach 1:
The patent applies a pre-bonding treatment to the GRP strands before the main adhesive bonding step. This preliminary action prepares the surface of the GRP strands to ensure better adhesion under wet conditions, creating a more reliable bond without significantly increasing overall process complexity.
3Strength
If high amounts of blocked diisocyanate are used in the adhesive composition, then initial adhesion is improved, but resistance to wet conditions worsens
Solution Approach 1:
The patent optimizes the concentration parameters of the adhesive composition by reducing the amount of blocked diisocyanate while compensating with alternative compounds and pre-bonding treatment. This parameter optimization achieves both good initial adhesion and improved resistance to wet conditions.
4Ease of manufacture
If conventional adhesive compositions are used, then manufacturing simplicity is maintained, but service life of composites deteriorates under temperature variations and wet conditions
Solution Approach 1:
The pre-bonding treatment serves as a preliminary action that enhances the long-term durability of the composite without significantly complicating the manufacturing process. This preliminary step creates a more robust interface that resists degradation from temperature variations and wet conditions throughout the service life.
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 process achieves high initial adhesion and maintains adhesive integrity under wet conditions, extending the service life of composites and products like tyres and belts.
Implementation Method 1
carrying out a step of pre-bonding one or more strands of GRP plastic by dipping the or these strand(s) in a first aqueous bath comprising a composition based on: an epoxy compound; and a blocked diisocyanate compound
Implementation Method 2
carrying out a step of deposition on the GRP plastic strand(s) by dipping the GRP plastic strand(s) in a second bath comprising an aqueous adhesive composition based on: at least one compound A1, the compound A1 comprising at least one aldehyde function; at least one phenol A21; at least one unsaturated elastomer latex
Data Source
AI summary
Sizing of one or more strands of glass-reinforced plastic (GRP): a) pre-bonding one or more strands of GRP plastic by dipping the strand(s) in a first aqueous bath comprising a composition based on an epoxy compound and a blocked diisocyanate compound; b) depositing on the GRP plastic strand(s) by dipping the GRP plastic strand(s) in a second bath comprising an aqueous adhesive composition based on at least one compound A1, the compound A1 comprising at least one aldehyde function, at least one phenol A21 and at least one unsaturated elastomer latex comprising at least one elastomer selected from butadiene copolymers, styrene-butadiene copolymers, vinyl pyridine-styrene-butadiene terpolymers, natural rubber, with the exception of chlorinated natural rubber, and mixtures thereof. The content of blocked diisocyanate compound in the aqueous adhesive composition of the second bath is at a weight content of strictly less than 0.50%.