1, low toxicity and broad-spectrum efficiency of various Gram-positive or negative bacteria, mold have strong inhibitory power, long sterilization time.
2, both inhibit the role of fungi.
3, has a strong formula compatibility, long duration of action, small odor, small skin irritation to workers.
4, used in paper industry weak alkaline, alkaline operating environment, no corrosion of equipment.
5, can reduce fiber degradation and improve paper strength.
According to the polymerization operation mode, select the appropriate decomposition rate and half-life of the initiator polymerization operation mode to choose the continuous method or the batch method, which will affect the residence time of the reaction materials in the reaction zone. In industrial production, it is undesirable that undecomposed initiators remain in the polymer. Because the remaining peroxide initiator may cause the polymer to undergo redox effect and turn its color into yellow, or the residence time of the reactant in the reaction zone during the continuous polymerization process is too short, the reaction will continue after being withdrawn from the reaction zone, resulting in non-controllability The reaction affects normal production. Therefore, in the batch polymerization process, the reaction time should be more than 2 times the food additives wax half-life of the initiator. The multiple varies with the type of monomer; in the continuous polymerization process, the monomer material is in the reactor. The average residence time should be much longer than the half-life of the initiator, so that the initiator is almost completely decomposed in the reactor, otherwise there will be quite a lot of the initiator undecomposed and flow out of the reactor with the reaction materials, which not only makes the materials easy to occur outside the reactor Polymerization reaction, and the monomer conversion rate is low, which affects normal production.
Choose an initiator with appropriate activation energy or half-life according to the reaction temperature. If the activation energy of the initiator is too high or the half-life is too long, the decomposition rate will be too low and the polymerization time will be prolonged; if the activation energy is too low or the half-life is too short, the initiation will be too fast. The temperature is difficult to control, and it may cause explosion, or the initiator decomposes and ends prematurely, and the polymerization reaction is stopped at the stage of lower conversion rate. Therefore, an initiator with a half-life of the same order of magnitude as or equivalent to the polymerization time should be selected according to the reaction temperature to match the formation rate of free radicals with the polymerization rate. In actual production, complex initiators are often used to solve the above problems, that is, two initiators with different half-lives are mixed and used, so that the initiator with a short half-life plays a role in the early stage of polymerization, and the initiator with a long half-life plays a greater role in the later stage.
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