Epoxy Resin Elasticity via Polyether Segmentation
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Solution Overview
Problem
Epoxy resins with existing modifications, such as polyoxyalkylene amines, do not provide sufficient elasticity and compromise corrosion resistance when used as coatings for base metals.
Innovation Solution
Epoxy resins with a polyether structure derived from 1,2,3-trihydroxypropane and aromatic dihydroxy compounds, linked via ether or ester linkages to aliphatic polyethers or polyesters, and further modified with aliphatic polyols and epoxy resins, enhancing elasticity and corrosion protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy resins are modified with polyoxyalkylene amines to improve elasticity, then elasticity is improved, but corrosion resistance deteriorates
Solution Approach 1:
The invention segments the modification approach by using separate components: a polyether-modified epoxy resin (A) for elasticity and an aliphatic polyol (C1) with oxyethylene groups for water solubility, rather than relying solely on polyoxyalkylene amine modifiers that compromise corrosion resistance
Solution Approach 2:
The invention creates a composite adhesive system comprising multiple components: epoxy resin (A) with polyether structure, aliphatic polyol (C1), and optionally aromatic polyol (C3), which together provide both elasticity and corrosion resistance that individual components cannot achieve alone
2Adaptability or versatility
If high amount of ethylene oxide units are added to provide hydrophilicity, then water solubility is improved, but corrosion resistance deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters by using aliphatic polyols (C1) with specific oxyethylene group content (20-100% by mass) and number average molar mass (200-20,000 g/mol), providing controlled water solubility without excessive ethylene oxide units that would harm corrosion resistance
Solution Approach 2:
The invention applies local quality by incorporating oxyethylene groups specifically in the polyol component (C1) rather than throughout the entire epoxy resin structure, providing hydrophilicity only where needed for water solubility while maintaining corrosion resistance in the protective coating
3Strength
If epoxy resins are modified to improve elasticity, then crack formation is reduced, but adhesion to substrates may deteriorate
Solution Approach 1:
The invention optimizes the molecular weight and structure parameters of the polyether-modified epoxy resin (A) and aliphatic polyol (C1) to achieve the right balance between elasticity and adhesion, where the modified resin provides flexibility without sacrificing substrate bonding capability
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 modified epoxy resins exhibit improved elasticity, reduced crack formation in thick layers, enhanced adhesion to substrates, and superior corrosion protection, as demonstrated in comparative testing with unmodified epoxy resins.
Implementation Method 1
The ether linkage is formed by the addition of the alcoholic hydroxyl group to the epoxy ring
Implementation Method 2
the ester linkage is introduced by reaction of the hydroxyl group-terminated polyether molecules B1 or hydroxyl group-terminated polyester molecules B2, or mixtures of these, with a dicarboxylic acid B4 or an anhydride B4′ thereof, under formation of a carboxyl group terminated intermediate which reacts with the epoxy terminal groups of an epoxy resin which forms the polyether structure A under ring opening and formation of an ester bond
Implementation Method 3
Epoxy resins with a polyether structure derived from 1,2,3-trihydroxypropane and aromatic dihydroxy compounds, linked via ether or ester linkages to aliphatic polyethers or polyesters, and further modified with aliphatic polyols and epoxy resins, enhancing elasticity and corrosion protection
Implementation Method 4
superior corrosion protection, as demonstrated in comparative testing with unmodified epoxy resins
Data Source
AI summary
A water-dilutable epoxy resin composition ABC of an epoxy resin AB and an emulsifier C, a process for its preparation, and a method of use thereof to make elastic coating films that impart good corrosion resistance even in thin layers. The epoxy resin AB featuring, in its polymer chain, moieties derived from aliphatic polyethers B1 having at least 4 carbon atoms in the alkylene group or from aliphatic polyesters B2 based on linear, branched or cyclic aliphatic polyhydric alcohols B21 and linear, branched or cyclic aliphatic polyvalent acids B22, where the average number of hydroxyl or acid groups in B21 or B22 is at least 1.9. The emulsifier C is a reaction product of an aliphatic polyol C1 and an epoxy resin C2.