Preparation method of amphiphilic silica flatting agent

Abstract

The invention discloses a preparation method of an amphiphilic silica flatting agent. The method comprises the following steps: silica powder is placed into a mixer and heated under stirring to 60-200 DEG C, and stirring is kept; a silane treating agent accounting for 2%-30% by mass of the silica powder is uniformly sprayed into the mixer in an atomized manner and sufficiently mixed with the powder, the mixture is heated to 70-250 DEG C, stirred for 0.5-3 h at the temperature and dried finally, the temperature is controlled at 50-250 DEG C, discharging is performed after drying for 0.5-6 h, natural cooling is performed, and the amphiphilic silica flatting agent is obtained. The obtained amphiphilic silica flatting agent is enabled to have lipophilicity and hydrophilicity by controlling temperature and reaction time under conditions of addition in proper proportion, certain temperature, cyclic motion state of microparticles and the like, the flatting agent is good in stability and is not prone to layering or production of hard precipitates, so that waste of the flatting agent and paint is reduced, ultrafine particles of the silica flatting agent are well arranged and uniform in luster, the visual effect is good, the flatting efficiency is increased, and the flatting performance is improved greatly.

Description

technical field [0001] The invention relates to the field of matting agents, in particular to a method for preparing an amphiphilic silica matting agent that can be used in both water-based paints and oil-based paints. Background technique [0002] Matting agent is a kind of white carbon black, which is produced by chemical reaction synthesis, and is an amorphous micron-sized ultrafine silica particle. Applied to oil-based, water-based and powder-based coatings, ink systems and the surface of plastic and aluminum products, etc., to play a matting effect. [0003] At present, the production processes of matting agents are mainly precipitation method, gel method and gas phase method. The gas phase method is produced abroad, while most of the domestic applications are precipitation method and gel matting agent. Precipitation and gel matting agents are unstable in storage in coating applications, are prone to layering, hard precipitation, low matting efficiency, poor dispersio...

AI Technical Summary

Problems solved by technology

Precipitation and gel matting agents are unstable in storage in coating applications, are prone to layering, hard precipitation, low matting efficiency, poor dispersion, poor particle arrangement, and uneven gloss

Therefore, domestic matting agents are mainly used in low-end and middle-end users, and imported matting agents are required for high-end products or users with high requirements for matting products, but even imported matting agents are easy to be layered The problem of hard precipitation and hard precipitation is still unavoidable, and in the later construction of the coating, the personal habits of the painter will also affect the quality of the coating

At present, the main solution to the above problems is to increase the materials to prevent hard precipitation, such as: polyamide wax powder, or add additives that can improve the alignment, but there is no way to solve the layering phenomenon after the coating is diluted, which affects the construction quality

[0004] The application number is 201510956261.5, which discloses a preparation method of superhydrophobic modified silica. This method adopts dry method modification with organosilane coupling agent. Due to the control of reaction temperature and time, the modification of silica occurs , and this is used for hydrophobic materials, but after modification, since the silica itself is in the form of powder, the van der Waals force between the particles changes after ultrafine pulverization, and the microstructure of the particles is easily destroyed, which seriously affects the matting effect of silicon