Crystalline Polyester Adhesive Composition for Blocking and Water Resistance
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Solution Overview
Problem
Existing polyester resins face issues with inadequate peel strength, blocking resistance, and water resistance, particularly in amorphous resins, and hygiene concerns in crystalline resins with sulfonate metal salts.
Innovation Solution
A crystalline polyester resin composed of specific ratios of terephthalic acid, 1,4-cyclohexanedicarboxylic acid, and 1,4-butanediol, with minimal sulfonate metal salts, having a glass transition temperature of -30 to 30°C and a melting point of 70 to 160°C, is used in an aqueous dispersion, which enhances adhesiveness and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If amorphous polyester resin is used to achieve flexibility, then glass transition temperature can be controlled, but peel strength and blocking resistance are insufficient
Solution Approach 1:
The invention changes the fundamental parameter of resin structure from amorphous to crystalline, achieving a melting point of 70-160°C. This structural transformation simultaneously improves peel strength (adhesiveness) and blocking resistance, as the crystalline structure provides both strong bonding capability and resistance to unwanted adhesion when cool.
Solution Approach 2:
The invention uses composite polycarboxylic acid components including terephthalic acid (30-70 mol%), 1,4-cyclohexanedicarboxylic acid (10-60 mol%), and other dicarboxylic acids (10-50 mol%). This composite composition enables the resin to achieve both high adhesiveness and excellent blocking resistance through synergistic effects of different molecular structures.
2Stability of the object's composition
If crystalline polyester resin with sulfonate metal salt is used to achieve crystallinity, then blocking resistance improves, but hygiene and water resistance deteriorate
Solution Approach 1:
The invention extracts and eliminates the harmful sulfonate metal salt component from the polyester resin system. By removing this problematic additive while maintaining crystalline structure through controlled copolymerization, the resin achieves both blocking resistance and improved hygiene/water resistance properties.
Solution Approach 2:
The invention changes the chemical composition parameters by strictly limiting sulfonate metal salt content to 1 mol% or less, and optimizing the polycarboxylic acid and polyhydric alcohol ratios. This parameter control enables the resin to achieve crystallinity and blocking resistance without relying on sulfonate metal salts, thereby improving hygiene and water resistance.
3Object-affected harmful factors
If aqueous dispersion is used to improve environmental compatibility, then solvent toxicity decreases, but storage stability and adhesiveness are compromised
Solution Approach 1:
The invention changes the resin structure parameters to achieve a glass transition temperature of -30 to 30°C and melting point of 70 to 160°C. These parameter optimizations enable the aqueous dispersion to maintain both environmental compatibility and high storage stability with no thickening or separation, along with excellent adhesiveness.
Solution Approach 2:
The invention uses composite polyester resin components with specific molecular weight distribution and functional group ratios. This composite structure enables the aqueous dispersion to achieve synergistic effects of environmental friendliness, storage stability, and high adhesiveness without requiring organic solvents.
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 crystalline polyester resin exhibits improved adhesiveness, blocking resistance, and water resistance, and hygiene, with a melting point of 70 to 160°C, and a melting point of 70 to 160°C, achieving improved adhesiveness, blocking resistance, and water resistance.
Implementation Method 1
the melting point of the crystalline polyester resin is 70 to 160°C
Implementation Method 2
the glass transition temperature of the crystalline polyester resin is -30 to 30°C
Data Source
AI summary
The present invention aims to provide an adhesive composition excellent in storage stability, adhesiveness, blocking resistance, and water resistance. A crystalline polyester resin containing a polycarboxylic acid component and a polyhydric alcohol component as copolymerization components, wherein 30 to 70 mol% of terephthalic acid and 10 to 60 mol% of 1,4-cyclohexanedicarboxylic acid are contained as the polycarboxylic acid component, and 50 mol% or more of 1,4-butanediol is contained as the polyhydric alcohol component, wherein the acid value of the crystalline polyester resin is 100 to 600 eq/t, wherein the glass transition temperature of the crystalline polyester resin is -30 to 30°C, and wherein the melting point of the crystalline polyester resin is 70 to 160°C.