Grafted Autoxidisable Polyester Resin for Low Viscosity High-Solids Coatings
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Solution Overview
Problem
Formulating high-solids coatings that reduce resin viscosity without compromising coating properties such as drying speed and hardness, while meeting environmental requirements for low volatile organic compounds (VOC) emissions.
Innovation Solution
A method of preparing a grafted autoxidisable polyester resin by grafting a diacid or its anhydride onto a first agent using Diels-Alder and/or Ene reactions, followed by reacting with a second agent, such as alcohol or dialkanolamine, to achieve a resin with high oil length, molecular weight, and polydispersity index, enabling fast and deep drying with low viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-solid alkyd resins are used to reduce VOC emissions, then environmental compliance is improved, but resin viscosity increases which compromises coating properties
Solution Approach 1:
The patent changes the molecular structure parameters of the polyester resin by introducing grafted diacid groups with conjugated double bonds. This structural modification enables the resin to achieve low viscosity at high solids content while maintaining coating properties, thereby resolving the contradiction between VOC reduction and viscosity control
Solution Approach 2:
The patent creates a composite resin structure by grafting diacid groups onto the polyester backbone. This composite approach combines the low viscosity advantage of modified polyesters with the high solids content requirement, achieving both environmental compliance and acceptable coating properties
2Ease of operation
If resin viscosity is reduced to improve coating flow and application, then ease of operation is improved, but drying speed and hardness are compromised
Solution Approach 1:
The patent modifies the resin's molecular architecture by grafting diacid groups with conjugated double bonds, which changes the viscosity-drying performance relationship. The grafted structure provides low viscosity for good flow while the conjugated double bonds enable fast autoxidation drying, resolving the contradiction between ease of operation and productivity
3Strength
If conventional polyester resins are used to maintain coating hardness and durability, then strength is improved, but viscosity remains high which affects formulation
Solution Approach 1:
The patent changes the molecular structure by introducing grafted diacid groups that reduce intermolecular interactions. This structural parameter change allows the resin to maintain coating hardness and durability while achieving lower viscosity and higher solids content, resolving the contradiction between strength and quantity
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 grafted autoxidisable polyester resin exhibits fast initial and in-depth drying, low viscosity, and improved durability, making it suitable for high-solids coatings with reduced VOC levels, while maintaining excellent coating properties.
Implementation Method 1
grafting of at least a diacid or its anhydride onto a first agent by a Diels-Alder and/or Ene reaction
Implementation Method 2
grafting of at least a diacid or its anhydride onto a first agent by a Diels-Alder and/or Ene reaction
Implementation Method 3
the grafted autoxidisable polyester resin exhibits fast initial and in-depth drying
Data Source
AI summary
A method for preparing a grafted autoxidisable polyester resin wherein the resin is obtained by steps comprising: a) grafting of at least a diacid or its anhydride onto a first agent by a Diels-Alder and/or Ene reaction; and b) reacting the product of step a) with a second agent. The first agent comprises at least one first functionality selected from a group consisting of a first set of conjugated double bonds or a first allylic hydrogen and comprises at least one further functionality selected from the group consisting of a set of conjugated double bonds, allylic hydrogen, non conjugated double bond, OH group, COOH group and amino group. The second agent is selected from the group consisting of alcohol with a number average hydroxy functionality > 2.0, dialkanolamine or mixtures thereof. The grafted autoxidisable polyester resin has an oil length = 80, a number average molecular weight Mn = 1000 g/mol and a PDI = 3. The grafted autoxidisable polyester resin is for example highly advantageous in high solid coating formulations and provides very low viscosities in combination with low drying times and relatively high average molecular weight.