Unsaturated Polyester Resin UV Yellowing and Heat Resistance
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Solution Overview
Problem
Existing unsaturated polyester resins face issues with yellowing and heat resistance due to quinone structure transformation under UV exposure, and previous solutions either have poor compatibility with polymers or limited heat distortion temperatures below 130°C.
Innovation Solution
A prepolymer composed of polyol, benzene-containing polybasic acid, and unsaturated polybasic acid with specific molar ratios, combined with triglycidyl isocyanurate, is used to enhance crosslinking and heat resistance, along with a cycloaliphatic epoxy resin for further improvement in yellowing and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional unsaturated polyester resin contains benzene rings and is exposed to ultraviolet rays, then the aromatic structure transforms into dark quinone structure, but this results in yellowing and chalking of the product, affecting appearance and lifetime
Solution Approach 1:
The patent changes the chemical composition parameters by using specific ratios of polyol, benzene-containing polybasic acid, and unsaturated polybasic acid (molar ratio 1:0.5-1.5:0.5-1.5), and controlling hydroxyl to carboxyl group ratio (1:0.8-1.2), to optimize the balance between UV resistance and structural stability, reducing quinone transformation while maintaining performance
Solution Approach 2:
The patent creates a composite resin system by combining unsaturated polyester resin with specific additives including organic montmorillonite (1-5 parts), nano titanium dioxide (1-5 parts), nano zinc oxide (1-5 parts), modified ultraviolet absorber (1-10 parts), and antioxidant (1-10 parts) per 100 parts of resin, forming a multi-component material that resists yellowing and chalking
2Reliability
If organic montmorillonite, nano titanium dioxide, and nano zinc oxide are added as fillers along with modified ultraviolet absorber and antioxidant, then anti-aging performance is significantly improved, but the additives are poorly compatible with polymers, causing easy volatilization, migration, and intolerance to solvent extraction
Solution Approach 1:
The patent optimizes the concentration parameters of each additive within specific ranges (1-5 parts for montmorillonite, 1-5 parts for nano TiO2, 1-5 parts for nano ZnO, 1-10 parts for UV absorber, 1-10 parts for antioxidant per 100 parts resin) to achieve optimal compatibility and anti-aging performance without excessive volatilization or migration
Solution Approach 2:
The patent uses modified ultraviolet absorbers as intermediary substances that not only absorb UV radiation but also improve the compatibility between inorganic fillers and the polymer matrix, reducing migration and volatilization while maintaining anti-aging effectiveness
3Object-affected harmful factors
If aliphatic unsaturated acid is used for polycondensation to avoid yellowing from quinoid transformation, then yellowing resistance is improved, but the heat distortion temperature of the resin is only 110°C
Solution Approach 1:
The patent creates a composite structure by combining benzene-containing polybasic acid (which provides heat resistance) with unsaturated polybasic acid (which provides yellowing resistance), achieving a synergistic effect where the resin maintains high heat distortion temperature while resisting UV-induced yellowing
Solution Approach 2:
The patent applies different functional components in specific proportions: benzene-containing polybasic acid (1 part) provides localized heat resistance, while unsaturated polybasic acid (0.5-1.5 parts) provides localized UV resistance, creating a material with non-uniform but optimized functional distribution
4Object-affected harmful factors
If alicyclic polyol and unsaturated acid with no aromatic structure are used for polycondensation, then yellowing resistance is improved and heat resistance is enhanced, but the heat distortion temperature is still below 130°C
Solution Approach 1:
The patent combines alicyclic polyol (providing yellowing resistance) with benzene-containing polybasic acid (providing heat resistance) in a composite resin system, achieving heat distortion temperature above 130°C while maintaining excellent yellowing resistance through synergistic interaction between components
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 solution achieves good yellowing resistance and heat resistance with a heat distortion temperature generally higher than 130°C, and improved curing reaction activity, facilitating the production of laminated boards with enhanced performance.
Implementation Method 1
the prepolymer is combined by polyol, benzene-containing polybasic acid, and unsaturated polybasic acid with a molar ratio of (2.2-4.5):(1-1.5):(1-1.5)
Implementation Method 2
Its long-term exposure to ultraviolet rays will transform the aromatic structure into a dark quinone structure
Implementation Method 3
triglycidyl isocyanurate 5-15 parts
Implementation Method 4
Its long-term exposure to ultraviolet rays will transform the aromatic structure into a dark quinone structure
Data Source
AI summary
The present invention relates to an unsaturated polyester resin, and a preparation method therefor and use thereof. The unsaturated polyester resin is prepared of the following raw materials in parts by mass: 50-90 parts of a prepolymer, 10-30 parts of phenylethylene, 5-15 parts of methyl methacrylate, and 5-15 parts of 1,3,5-triglycidyl isocyanurate. The prepolymer is formed by combining polyol, a benzene-containing polybasic acid, and an unsaturated polybasic acid with a molar ratio of (2.2-4.5):(1-1.5):(1-1.5); and in the prepolymer, the molar ratio of hydroxyl to carboxyl is (1.0-1.5):1. The unsaturated polyester resin has good yellowing resistance and also has good heat resistance, and a thermal deformation temperature is generally higher than 130° C.