Epoxy floor products are high-value, high-quality, high-demand products, the correct use of methods can keep the ground as fresh as ever. Despite many advantages of epoxy floor products, many outdoor surface pavement still abandoned epoxy floor materials. This is mainly because the epoxy floor products are not suitable for outdoor, laying outdoor easy yellowing. How to solve the yellowing problem of epoxy floor products? "Epoxy flooring believes that the effective solution is to add antioxidants and ultraviolet absorbents, which can effectively prevent and delay yellowing. However, there are many kinds of antioxidants, so it needs some technical support and experience to select suitable products. 环氧环氧地坪制品易发黄原因
Xanthan Causes of Epoxy Floor Products
1. Bisphenol A structure of aromatic epoxy resin is easy to oxidize to produce carbonyl group to form yellowing group.
2. Free amines in amine curing agents are directly polymerized with epoxy resin, resulting in local temperature rise and accelerated yellowing.
3. Tertiary amine accelerators and nonylphenol accelerators are easily discolored under hot oxygen and UV irradiation.
4. Excessive high temperature in the reaction process will induce yellowing of residual impurities and metal catalysts in the system.
Solutions to yellowing of epoxy floor products
Selection of effective antioxidants
One is the main antioxidant: capturing peroxide free radicals, mainly hindered phenol antioxidant; the other is the auxiliary antioxidant: decomposing hydrogen peroxide, mainly phosphite and thioester. Generally, different antioxidants are recommended according to the production process and raw materials, solvents, auxiliaries and fillers of each manufacturer, which stage of yellowing and the degree of yellowing are different.
Using appropriate ultraviolet absorbent
Ultraviolet radiation is the main source of oxidative yellowing of epoxy system. Therefore, especially for those customers who need to use outdoor products, we recommend adding a certain amount of ultraviolet absorbent to the products to effectively absorb ultraviolet radiation and delay yellowing. Moreover, the use of ultraviolet absorbers together with antioxidants can play a synergistic effect, with the effect of 1 plus 1 greater than 2.
In fact, the use of antioxidants and ultraviolet absorbents can not fundamentally solve the problem of epoxy floor yellowing, but in a certain range and a certain period of time, it is still effective to prevent oxidation yellowing, maintain the transparency of product water color, and improve the grade of floor products.
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