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Surface treatment of polyethylene wax filler


Release time:

2019-05-21

Inorganic fillers, whether salt, oxide, or metal powder, are polar water-insoluble substances, when they are dispersed in the polar organic polymer resin, due to the difference in polarity, resulting in poor compatibility between the two, thus the processing performance of filled plastics and the use of performance of products to bring adverse effects.

Surface treatment of polyethylene wax filler

Inorganic fillers, whether salt, oxide, or metal powder, are polar water-insoluble substances, when they are dispersed in the polar organic polymer resin, due to the difference in polarity, resulting in poor compatibility between the two, thus the processing performance of filled plastics and the use of performance of products to bring adverse effects. Therefore, it is necessary to properly treat the surface of the inorganic filler and make the surface polarity close to the polymer resin filled by chemical reaction or physical method to improve its compatibility.

There are basically two types of mechanism of filler surface treatment, one is surface physical action, including surface coating (or called coating) and surface adsorption; the other is surface chemical action, including surface substitution, hydrolysis, polymerization and grafting. The combination of the surface treatment of the former type of filler and the treatment agent is an intermolecular force, and the surface of the latter type of filler is combined with the treatment agent through a chemical reaction. The mechanism of the surface treatment of the filler mainly depends on the composition and structure of the filler, especially the type, quantity and activity of the functional group on the surface of the filler, and is also related to the type of surface treatment agent, the surface treatment method and the process conditions.

Generally speaking, the filler has a large specific surface area, high surface functional group reactivity, high density, and the selected surface treatment agent has high reactivity with the surface functional group of the filler, small steric hindrance, and suitable surface treatment temperature. The surface treatment of the filler is mainly based on chemical reaction, and vice versa. In fact, most of the two mechanisms of filler surface treatment exist at the same time. For a given filler, if a surfactant, a long-chain organic acid salt, a high-boiling point chain hydrocarbon, etc. are used as the surface treatment agent, the treatment is mainly carried out by physical action of surface coating or surface adsorption, and if a coupling agent, a long-chain organic acid chloride or phosphorus oxychloride, a metal organic alkoxy compound, an epoxy compound, etc. are used as the surface treatment agent, the treatment is mainly carried out by surface chemical action.

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