Mold inhibitor is a class of polymer additives that can inhibit the growth of mold and kill mold, can make polymer materials from fungal erosion, maintain good appearance and physical and mechanical properties.
The coating film-forming material consists of a variety of natural and synthetic polymer compounds, to withstand the damaging effects of oxygen, heat, light, chemical aggressives and other environmental factors, but also by a variety of organisms such as mold damage. Paint contaminated by microorganisms, viscosity decline, pigment settlement, odor, gas, container expansion, pH drift and system damage, called corruption.
In solvent-based coatings, mold erodes the coating film, causing discoloration, stickiness, perforation, damage and peeling, loss of adhesion, affecting the protective properties of the coating film and the neatness and appearance of the material, reducing the mechanical properties, shortening the service life, and causing harm to environmental health.
Benzyl is also known as diphenyl ethylenedione. Although photolysis can produce two molecules of benzoyl radicals, the efficiency is too low and the solubility is not good. Its most valuable derivative is wrc r dimethoxy α-phenylacetophenone (DMPA, also known as αi or dimethyl benzyl ketal, DM-BK), which is the common Irg a on the market Cure 651 photoinitiator, its structure is shown in formula (7-3). A qualified DMPA photoinitiator micronized polymer wax should be colorless crystals, with a melting point of 64~67℃, A max of 337nm, and good solubility in many common solvents. High anti-quenching and photoinitiation activity, widely used in unsaturated polyester-styrene system [61, acrylate system, siloxane system [and pigment coloring system [9.]. Since there is no active hydrogen like benzoin initiator in its molecular structure, its thermal stability is very good.
cDMPA(Irg a cure 651)(7-3)
The initiation activity of DMPA is relatively satisfactory. When irradiated at 350nm, the measured quantum efficiency of a cracking is as high as 0.5209], which is higher than the cracking quantum efficiency of benzoin ether. But its yellowing performance is also more serious [u], it is difficult to accept in varnish systems, but in some pigment coloring light curing systems, it is often used in combination with photosensitizers.
As cr dialkoxy acetophenone can be regarded as the acetal derivative of benzoyl formaldehyde, and the reports that have been reported mainly include the following structures.
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