This is a commonly used leather anti-mildew agent, but also an anti-aging agent, with very low toxicity.
It is a colorless liquid with slightly irritating odor, which can match well with various leathers and has good anti-mildew effect and protects leather for a long period at a very reasonable price. Leather is easy to be attacked by microorganism in the process of production and storage, which will cause serious economic loss due to corruption and mildew. For the special process conditions such as high salt, high acidity and alkalinity in the tanning process, we have developed a series of fungicidal and anti-mildew preservatives, which are broad-spectrum, high-efficiency and free of phenols and solvents harmful to the environment, and meet the strict requirements of import and export quarantine and inspection in Europe and America.
In emulsion polymerization, organic peroxides, especially organic peroxides, are often used as initiators. The free radicals it generates are more lipophilic than inorganic peroxide free radicals and are easier to enter into micelles. In the late stage of the polymerization reaction, when the monomer concentration in the water phase is very low, a tert-butyl peroxide initiator can be added to increase the monomer conversion rate in the latex particles.
Azo initiators have not been widely used in emulsion polymerization. The research and development of ebs amide wax water-soluble azo initiators have enabled azo initiators to be used in emulsion polymerization. The decomposition temperature of water-soluble azo initiator is 40~80℃, which is very suitable for emulsion polymerization.
Low-temperature polymerization reactions usually use a redox initiation system. It can generate free radicals to initiate polymerization at -50~50°C. The initiation system is particularly suitable for the emulsion polymerization of monomers with low boiling points, such as vinyl acetate and butadiene.
The use of initiators The emulsion polymerization reaction process is not exactly the same as the solvent polymerization reaction. In the first stage of the emulsion polymerization reaction, the free radicals generated by the initiator enter the micelles through various ways, and the polymerization reaction proceeds in the micelles, and the growth free radicals exist in isolation from each other. Although the overall concentration of free radicals is high, the probability of coupling termination is very small. In the early stage of the emulsion polymerization, the initiator continuously initiates the polymerization reaction of the monomers in the micelles, generating more and more active centers, and the polymerization reaction rate is continuously accelerated, followed by a stage of constant polymerization rate. With the disappearance of the monomer droplets, the monomer concentration in the colloidal particles gradually decreases, and the polymerization rate slows down.
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