It is recommended that a small amount of MEIBOSS paint anti-mildew agent can be added to the paint during the wall decoration process, MEIBOSS paint anti-mildew agent is an additive added to the paint to make anti-mildew paint. Preparation into anti-mold paint can greatly reduce the rate of mold. This is an effective way to keep the walls free from mold and mildew.
Photodegradation process of aliphatic polyester acrylate cross-linking system
The polysiloxane cross-linking system has higher anti-light aging performance, and the anti-light aging performance of the system with high cross-linking density is often better than that of the system with low cross-linking density. If the polymer contains halogenated groups (C-X) such as chlorine and bromine, the C-X bond is prone to photo-cracking.
In short, the detailed mechanism of photoaging of coatings is very complicated, and traces of photosensitive impurities, oxides and catalytic metal ions may have an important impact on the photoaging of polymer coatings. The above discussion is only some processes that have a high probability of occurrence or have been confirmed by research.
Photo-aging yellowing of the coating
Yellowing is just a sign of chemical changes inside the coating. There may be many reasons. In terms of resin structure, when photooxidation occurs, the formation of carbonyl groups, unsaturation, peroxides, complexes and other structures may cause the yellowness of the coating to deepen. . Additives such as amine curing agents and catalysts sometimes also promote photoaging and yellowing. For the photo-aging yellowing of light-curable coatings, sometimes it only comes from the various changes of photosensitive components, and is not much related to the resin photo-crosslinked network structure. That is to say, the increase in the sasol wax company yellowness of the cured film does not necessarily indicate the film The layered cross-linked structure has undergone degradation and aging, and the oxidative degradation of the cross-linked network usually leads to an increase in yellowness. A typical situation is that the yellowing of the coating during the photo-curing process and the early photo-aging process is likely to be caused by the photolysis of the photo-initiated system, and the yellowing in the late photo-aging is basically caused by the resin cross-linked network itself. The photo-oxidation degradation caused by this kind of photo-yellowing from different reasons can be used to qualitatively reflect.
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