Powder coating anti-mildew agent KP-M27

KP-M27 belongs to the special anti-mildew additive for powder coating, and the five kinds of dry film anti-mildew agents used are optimized and screened for hundreds of times, and the optimal formula was arrived at after five years. It is a new generation of dry film anti-mildew agent for coatings with exceptionally superior stability in the dry film. Applicable to almost all dry film system of mold treatment.

αar diethoxyacetophenone (DEAP) has high photoinitiation efficiency [12] and has been commercialized. There are weak C-C bonds adjacent to the carbonyl group and the alkoxy group in the structure, and the photolysis efficiency is relatively high. Since there is no long-lived substituted benzyl radical structure in the photolysis product of DEAP, the cured coating basically does not appear yellowing. In addition, the H on a-C in the molecular structure of DEAP has considerable activity and is easy to leave under thermal conditions to generate free radicals, which may be the main factor affecting its thermal storage stability.

The photoinitiation activity of DEAP is higher among several types of photoinitiators developed earlier. In homogeneous polymerizable systems (such as acrylates), the photoinitiation activity of DEAP is equivalent to that of DM-PA, but in micellar systems, DEAP It exhibits higher photoinitiation activity than DMPA, which may be related to the liquid state of DEAP [13]. In general, the initiation efficiency of DEAP photoinitiators is not as good as that of α-hydroxyalkylphenone series photoinitiators.

4.a-Hydroxyalkylphenone
αr hydroxyalkyl phenone has a high photoinitiation activity as a whole [14], and it is currently the most successful type of photoinitiator in application and development. Its main varieties include the following structures.
OCHa
OOH
R-CC-OH-C
CH:
R=-H(HM PP, Daro cur 1173)HCP K(Irg a cure 184)
-OCH: CH: OH (HH MP, Daro cur 2959)
(7-5)
CHy
-CH(Daro cur 1116)
CHa
The simplest structure is 2-hydroxy-2-methyl-1-phenyl-1-propanone (HM PP), the trade name is Daro cur 1173 (Ciba company), the qualified product is a colorless liquid or slightly yellow at room temperature. The input mx is 331nm, which is one of the most widely used photoinitiators in the domestic photocuring industry. The other is 1-hydroxy-cyclohexyl phenone (HCP K), the trade name is Irg a cure184, the qualified product should be a colorless powdery crystal, with a melting point of 45~49℃, A max of 333nm, and it also has a fairly high light. micronized polypropylene wax Initiating activity is also one of the most commonly used photoinitiators in the domestic industry. These two photoinitiators are welcomed by users for their excellent photoinitiation performance, excellent thermal stability and other comprehensive balance properties. In addition, they are used as photoinitiators in acrylate systems, and they do not produce substituted benzyl radical structures that easily cause yellowing during photolysis, so they basically do not cause yellowing of the cured coating.