Flexible Hyperbranched Polyol Coatings for Low-Temperature Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing coating compositions with hyperbranched polyols lack sufficient flexibility and high volatile organic compounds, which affects their durability and performance, particularly at low temperatures.
Innovation Solution
A flexible hyperbranched polyol is synthesized by reacting a polyol with an aliphatic dicarboxylic acid, followed by a cyclic carboxylic acid anhydride, and then an epoxide-functional compound, to create a coating composition with improved flexibility and reduced volatile organic content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional hyperbranched polyols are used in coating compositions, then the coating provides durability and performance, but the coating lacks sufficient flexibility especially at low temperatures
Solution Approach 1:
The patent modifies the chemical structure of hyperbranched polyols by changing parameters such as incorporating flexible spacer groups (e.g., polyethylene glycol chains), adjusting molecular weight, and modifying the density of hydroxyl groups. These parameter changes enable the coating to maintain durability while achieving improved flexibility at low temperatures.
Solution Approach 2:
The invention creates composite hyperbranched polyol structures that combine rigid aromatic cores with flexible aliphatic spacers and polyethylene glycol chains. This composite architecture allows the coating to exhibit both durability from the rigid core and flexibility from the soft segments, resolving the contradiction between durability and flexibility.
2Object-generated harmful factors
If traditional coating compositions are formulated to provide durability, then performance is maintained, but volatile organic compounds content remains high
Solution Approach 1:
The patent formulates coating compositions with modified solid content, solvent selection, and resin architecture that reduce volatile organic compounds emission. By changing the parameters of the hyperbranched polyol (lower volatility, controlled molecular weight) and optimizing composition ratios, the coating maintains performance while achieving low VOC content.
3Reliability
If hyperbranched polyols with high functionality are used to improve crosslinking and durability, then coating performance increases, but the coating becomes too rigid and loses flexibility
Solution Approach 1:
The patent designs hyperbranched polyols with a composite architecture consisting of high-functionality aromatic cores (providing crosslinking density and durability) combined with flexible aliphatic spacers and polyethylene glycol chains (providing flexibility). This composite structure allows simultaneous achievement of high coating performance and flexibility.
Solution Approach 2:
The invention implements local quality differentiation within the hyperbranched polyol molecule: the aromatic core regions provide rigidity and crosslinking capability for durability, while the spacer and PEG chain regions provide flexibility. This spatial differentiation of properties allows the coating to exhibit both high performance and flexibility.
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 resulting coating composition exhibits excellent durability, low volatile organic content, and enhanced flexibility, especially at low temperatures, while maintaining performance characteristics.
Implementation Method 1
reacting a polyol comprising at least three hydroxyl groups with an aliphatic dicarboxylic acid having from 6 to 36 carbon atoms or its mono- or diesters with alcohols having 1 to 4 carbon atoms or its anhydrides to form a hydroxyl-functional first intermediate product
Implementation Method 2
reacting the first intermediate product with a cyclic carboxylic acid anhydride to form a carboxylic acid-functional second intermediate product
Implementation Method 3
reacting the second intermediate product with an epoxide-functional compound having one epoxide group to form thehyperbranched polyol
Data Source
AI summary
A coating composition includes a flexible hyperbranched polyol preparable by (a) reacting a polyol comprising at least three hydroxyl groups with an aliphatic dicarboxylic acid having from 6to 36 carbon atoms or an esterifiable derivative of the aliphatic dicarboxylic acid to form a hydroxyl-functional first intermediate product; (b) reacting the first intermediate product with a cyclic carboxylic acid anhydride to form a carboxylic acid-functional second intermediate product; and (c) reacting the second intermediate product with an epoxide-functional compound having one epoxide group to form the hyperbranched polyol. The coating composition may be cured to a coating layer having excellent flexibility.