Why is waterborne epoxy ester resin not transparent?
Date:
2020-12-02
Due to the advantages of high bonding strength, wide bonding surface, low shrinkage, good stability, excellent electrical insulation, high mechanical strength and good processability, waterborne epoxy ester resin is widely used in electrical insulation casting, anti-corrosion coating, metal bonding and other fields. But many people will ask why water-based epoxy ester resin is not transparent. Today, water-based epoxy ester resin manufacturers will answer this question!
waterborne epoxy ester resinDue to the advantages of high bonding strength, wide bonding surface, low shrinkage, good stability, excellent electrical insulation, high mechanical strength, and good processability, it is widely used in electrical insulation casting, anti-corrosion coatings, and metal bonding. But a lot of people will askwaterborne epoxy ester resinWhy not transparent today?waterborne epoxy ester resinThe manufacturer will answer this question!
Causewaterborne epoxy ester resinThere are many factors of yellow. For example:
1. The structure of aromatic epoxy resin bisphenol A is easy to oxidize to produce carbonyl groups to form yellowing groups;
2. The free amine component in the amine curing agent directly polymerizes with the epoxy resin, resulting in local heating and accelerated yellowing;
3. Tertiary amine promoter and nonylphenol promoter are easy to change color under thermal oxygen and UV irradiation;
4. If the temperature is too high during the reaction, the residual impurities and metal catalysts in the system will induce yellowing.
The classification of antioxidants, one is the main antioxidant: capture peroxide free radicals, mainly hindered phenol antioxidants; one is the auxiliary antioxidant: decomposition of hydrogen peroxides, mainly phosphites, thioesters. The use of antioxidants and ultraviolet absorbers can not fundamentally solve the problem of yellowing, but in a certain range and a certain period of time, it can effectively prevent the product from oxidizing and yellowing, keep the product color transparent, and improve the quality of the product.
Causewaterborne epoxy ester resinThe main culprit of oxidation yellowing is ultraviolet rays, which are mainly from sunlight. Therefore, especially in the face of customers who need to use the products outdoors, we will recommend to add a certain amount of ultraviolet absorbers to the products, which can effectively absorb ultraviolet rays and delay yellowing.
Waterborne Epoxy Ester Resin, Waterborne Resin
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