Inorganic antimicrobial agent is a composite of inorganic substances such as metal ions with antimicrobial properties and their inorganic carriers. It has the advantage of good heat resistance and processability, and can be widely used in plastics, synthetic fibers, building materials, paper and other industries.
Inorganic antimicrobial agent belongs to the dissolution type antimicrobial agent, according to its antimicrobial composition, in addition to several small categories, there are mainly two categories of carrier combined with metal ion type and iron oxide photocatalytic type.
When preparing thermosetting acrylic resin, use 53.3% methyl alcohol, 30% n-butanol and 16.7% isopropanol as solvents, and polymerize at four-stream temperature. Using 2.2 azobispropionitrile as the initiator, the monomer and initiator were dropped into the reactor uniformly for 4 hours, and the reaction was continued for 10 hours, and the monomer conversion rate reached 100%. As shown in Table 4-19, solution mw wax additive in different examples, the amount of initiator used is different, and the relative molecular mass of the resulting polymer also changes.
The relationship between the amount of initiator and the relative molecular weight of the polymer
The type of agent and the concentration of monomer need to be determined by experiment.
Initiator of unsaturated polyester cross-linking film formation There are double bonds on the unsaturated polyester molecule, and the polymerization reaction can be cross-linked to form the film by using the initiator to initiate the polymerization reaction. The type and amount of the initiator depend on the resin structure, curing conditions and coating film performance Requirements.
The principle of initiator use is roughly the same as that of bulk polymerization. The most important thing is to match the curing temperature with the activity of the initiator. If the curing temperature is high, use an initiator with a higher decomposition temperature. Generally, the mixed use of two initiators has better effect. For example, under curing conditions of 60~80℃, a mixed initiator of 1% benzoyl peroxide and 1% cumene hydrogen peroxide can be used. When curing above 120°C, a mixed initiator of 1% benzoyl peroxide and 1% tert-butyl hydroperoxide or tert-butyl peroxybenzoate can be used.
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