Silica can be surface treated with organic coatings (mainly polymer waxes) to obtain easily dispersed matting agents, and can improve the scratch resistance of the coating film and prevent hard precipitation during storage. Treated silica has a slight effect on the matting effect, and is mostly used in wood varnishes and industrial gloss coatings.
General coatings use untreated silica matting agent, because of which there is already a color filler, in order to prevent precipitation has often taken measures, there is no matting agent precipitation problem. In addition, untreated silica has an effect on the viscosity of the base material, and can give the coating system to thixotropy and play a role in preventing the pigmentation of the filler. The ph of surface-treated silica can vary, as can the range of application.
Alkylphenol ether sulfates, phosphates and succinates are mainly used as basic anionic emulsifiers and are widely used in the production of acrylate, styrene/acrylate and vinyl acetate copolymers. Non-ionic emulsifier
As mentioned earlier, alkylphenol polyoxyethylene ether has been used as a nonionic emulsifier in emulsion polymerization for many years. Due to the price advantage of propylene and butene, nonyl (tripolypropylene) phenol polyoxyethylene ether and octyl (dipolybutene) phenol polyoxyethylene ether have been widely used, while dodecyl (tetrameric internal ene Or tri-butylene) phenol polyoxyethylene ether seahawk wax additive and tri-tert-butylphenol polyoxyethylene ether are only used as special bodies. Low ethoxylation can only work in combination with other (anionic) surfactants. The medium ethoxylation degree generally has a better ability to improve the mechanical stability, and the high ethoxylation degree can improve the resistance to metal ions.
Since the discussion on the biodegradation of alkylphenol surfactants began, fatty alcohol polyoxyethylene ethers and some specially developed products, such as Dispo nil A series and Dispo-nil AFX series, have opened up the use of surfactants in emulsion polymerization. On a new page, as a non-ionic emulsifier, it is widely used in major international polymer emulsion manufacturers. Green non-ionic surfactants will become more and more popular. The emulsion polymerization industry is also introducing anionic alkyl phenols. Ether sulfate, phosphate and succinic sulfonate half esters were changed to corresponding fatty alcohol ether sulfates, phosphates and succinate sulfonates.
Polyalkyl glycosides are environmentally friendly surfactants, which are derived entirely from renewable resources, starch and vegetable oil, and can also be used as non-ionic emulsifiers.
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