Acrylic Modified Polyester Resin Steam Sterilization Resistance
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Solution Overview
Problem
Polyester-based coating compositions face challenges with insufficient resistance to boiling and steam sterilization due to ester linkage breakage and excessive hydrophilicity when modified with hydrophilic functional groups, leading to degraded performance and adhesion issues.
Innovation Solution
A novel acrylic modified polyester resin is developed by using a polyester prepolymer and cycloalkanedicarboxylic acid monomer, with a (meth)acrylic monomer grafted to enhance flexibility, solvent resistance, and steam sterilization resistance, achieved through specific monomer ratios and reaction processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydrophilic functional groups are introduced to increase water solubility, then water thinnability is improved, but water resistance and steam sterilization resistance deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the polyester resin by introducing specific hydrophilic groups (carboxyl, hydroxyl, or amine groups) with controlled content (0.1-5.0 mmol/g), and simultaneously controls the ester linkage content (1.0-5.0 mmol/g). This dual parameter control enables the resin to be water-thinnable while maintaining adequate water and steam sterilization resistance.
2Reliability
If polyester resin is used to achieve good adhesion and flexibility, then adhesion and impact resistance are improved, but resistance to boiling and steam sterilization deteriorates due to ester linkage breakage
Solution Approach 1:
The patent optimizes the content of ester linkages (1.0-5.0 mmol/g) to balance adhesion properties with resistance to hydrolysis. By controlling this parameter along with hydrophilic group content, the resin achieves both good adhesion and improved stability under boiling and steam sterilization conditions.
Solution Approach 2:
The patent creates a composite chemical structure within the polyester resin by combining hydrophilic functional groups with controlled ester linkages, and optionally incorporating acrylic modification. This composite approach enables the resin to exhibit multiple properties simultaneously: good adhesion, water thinnability, and enhanced resistance to high-temperature hydrolysis.
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 exhibits improved gloss retention, high chemical resistance, and stability under steam sterilization, maintaining adhesion and mechanical properties, suitable for diverse applications including food packaging and automotive coatings.
Implementation Method 1
a (meth)acrylic monomer grafted to the polyester through a reaction with the double bond
Implementation Method 2
the polyester prepolymer is prepared by polycondensation of the following monomers
Implementation Method 3
the ester linkage on the polymer backbone is prone to breakage due to hydrolysis at a high temperature
Data Source
AI summary
The present disclosure relates to an acrylic modified polyester resin, and specifically, a modified polyester resin prepared by grafting an acrylic monomer to a polyester prepolymer. The polyester prepolymer is formed from pentaerythritol, a polyol monomer, an organic polycarboxylic acid monomer and a cycloalkanedicarboxylic acid monomer and contains a double bond on its backbone.The present disclosure also relates to a method for preparing the acrylic modified polyester resin.