Ketone-Aldehyde Modified Resin for Fast Room-Temperature Curing
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Solution Overview
Problem
Conventional polyester and alkyd resins have slow curing speeds at room temperature, limiting their industrial coating applications, and existing modifications, such as with acrylic or phenolic resins, either increase molecular weight, reduce gloss, or compromise weather resistance.
Innovation Solution
A ketone-aldehyde modified resin is developed by reacting unsaturated polyester or alkyd resin monomers with a ketone-aldehyde resin, optimizing hydroxyl group content and compatibility to enhance curing speed without impairing gloss or weatherability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional polyester or alkyd resins are used for room temperature curing, then the resins can be applied without special curing conditions, but the curing speed is too slow for industrial applications
Solution Approach 1:
The patent modifies the chemical structure of polyester or alkyd resins by introducing ketone-aldehyde moieties through reaction with dicarbonyl compounds. This structural parameter change enables the resin to undergo rapid crosslinking at room temperature via intramolecular cyclization and intermolecular crosslinking reactions, transforming the slow auto-oxidation curing mechanism into a faster chemical crosslinking process while maintaining room temperature application capability
Solution Approach 2:
The patent creates a composite resin system by combining modified polyester or alkyd resin chains with ketone-aldehyde functional groups. This composite structure integrates the flexibility and weatherability of polyester/alkyd resins with the fast-curing capability of ketone-aldehyde crosslinking, achieving both rapid drying and preserved coating properties
2Productivity
If alkyd resin is modified with acrylic monomer to improve drying speed, then the curing speed increases, but the molecular weight becomes very high and requires large amounts of solvent, and gloss is significantly reduced
Solution Approach 1:
The patent changes the chemical structure by introducing ketone-aldehyde functional groups that undergo intramolecular cyclization to form six-membered rings. This structural transformation increases crosslinking density without proportionally increasing molecular weight, as the cyclization creates compact cyclic structures rather than long linear chains. The result is faster curing with controlled molecular weight growth
Solution Approach 2:
The patent applies partial modification by reacting only a portion of the hydroxyl groups in the polyester or alkyd resin with dicarbonyl compounds. This partial action allows the resin to maintain its base polymer characteristics and compatibility while gaining the fast-curing capability from the introduced ketone-aldehyde groups, avoiding the excessive molecular weight increase that would result from complete modification
3Productivity
If alkyd resin is modified with phenolic resin to improve drying speed, then the curing speed increases, but weather resistance is significantly reduced
Solution Approach 1:
The patent changes the chemical structure by introducing ketone-aldehyde functional groups that undergo intramolecular cyclization to form six-membered rings. This structural transformation increases crosslinking density without proportionally increasing molecular weight, as the cyclization creates compact cyclic structures rather than long linear chains. The result is faster curing with controlled molecular weight growth
Solution Approach 2:
The patent applies partial modification by reacting only a portion of the hydroxyl groups in the polyester or alkyd resin with dicarbonyl compounds. This partial action allows the resin to maintain its base polymer characteristics and compatibility while gaining the fast-curing capability from the introduced ketone-aldehyde groups, avoiding the excessive molecular weight increase that would result from complete modification
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 ketone-aldehyde modified resin achieves significantly faster drying times while maintaining or improving gloss and weather resistance, with no need for additional catalysts, and exhibits reduced molecular weight and viscosity.
Implementation Method 1
Conventional alkyds are cured by auto-oxidation crosslinking. The unsaturated fatty acid or methylene group in the oil is oxidized by air into peroxides which are subsequently decomposed into free radicals to crosslink the alkyd resin.
Data Source
AI summary
The present invention discloses a ketone-aldehyde modified resin and the preparation process thereof. The ketone-aldehyde modified resin comprises a ketone-aldehyde modified unsaturated polyester, a ketone-aldehyde modified unsaturated alkyd or the combination thereof, and wherein the said resin has ketone-aldehyde moieties. The process of the said resin comprises the steps of: reacting unsaturated polyester-forming and/or unsaturated alkyd resin-forming monomer components with a ketone-aldehyde resin. The present invention also discloses a coating composition comprising the said resin as well as a coated article. The ketone-aldehyde modified resin and the coating composition achieve significantly improved fast drying effect, while other properties are not observably impaired or even improved.