Since NTO molecules contain active H atoms, they can react with -NCO to make the antibacterial molecules part of the macromolecule, thus making the macromolecule have antibacterial effects due to the antibacterial groups.
In actual production, the initiator and monomer are often used to slowly drip into microcrystalline wax additive the reactor at the same time to supplement the consumed initiator in time. The dripping process is commonly used in the preparation of copolymers with low molecular weight. Generally, the dropping time is 2~4h. When the monomer and initiator are added, the monomer conversion rate is generally more than 70%.
The dropping time is long and the monomer conversion rate is high. High initiator. At the polymerization temperature, its decomposition half-life is much shorter than the reaction time. In order to increase the conversion rate, an initiator can be added in the later stage of the reaction.
Tu lacs Laszlo Dipl-Ing uses aromatic hydrocarbons with a boiling point of 160~180°C as a solvent when synthesizing hydroxy acrylic resin, and initiates the polymerization reaction with di-tert-butyl peroxide. The monomer and initiator (diluted with the above solvent) are uniformly dropped into the refluxing solvent for 10 hours. After the monomer is added dropwise, the monomer conversion rate of the polymerization reaction is above 95%, and the monomer conversion rate of the final product reaches 99%. Above, the molecular weight distribution and composition distribution are relatively uniform. Compared with the coating obtained by the general process, the resulting coating has improved impact resistance under the same hardness.
The industry also often uses a mixture of two initiators as initiators, for example, benzoyl peroxide and dicumyl peroxide or di-tert-butyl peroxide.
The effect of monomer and solvent on the decomposition rate and initiation efficiency of the initiator The decomposition rate of the initiator is not only determined by its own activity and polymerization temperature, but also by the solvent and monomer.
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