Preparation method of water-based aluminum pigment for external wall heat insulation

Abstract

The invention discloses a preparation method of a water-based aluminum pigment for external wall heat insulation. The method comprise the steps of feeding raw materials including spherical aluminum powder, a grinding medium, an environment-friendly solvent oil, oleic acid or erucic acid, a passivant, and a titanate coupler into a ball mill; sealing the ball mill, performing ball milling and discharging the raw materials with the environment-friendly solvent oil; conveying the materials into a vibration screen through a pipeline to be screened, removing screen tailings, and putting the materials into a frame filter press to conduct filter pressing, so as to obtain filter cakes with a solid content of 80 percent; and putting the filter cakes, an alcohol or ether solvent with good water miscibility and low molecular weight polyvinyl alcohol together into a reaction kettle, keeping the temperature, discharging the materials, putting the materials into the frame filter press to conduct filter pressing, and performing solid liquid separation so as to obtain a finished product. According to the method, the environment-friendly solvent is adopted to meet national environmental requirements. The aluminum pigment prepared through the method has good water resistance, acid resistance and alkali resistance of the aluminum pigment are achieved, the environmental innocuousness and the service life of the aluminum pigment as a wall insulating coating are improved, and the aluminum pigment is easy to disperse in a paint.

Description

technical field

[0001] The invention relates to a method for preparing an environment-friendly metal pigment for exterior wall paint, in particular to a method for preparing a water-based heat-insulating aluminum pigment for exterior walls. technical background

[0002] With the continuous improvement of people's awareness of environmental protection and the increasingly stringent environmental protection regulations, environmentally friendly coatings will become the protagonists of the world coatings market in the 21st century, and currently have a very broad market in China. As the main raw material of metallic pigments for exterior wall coatings, the research and development of water-based aluminum pigments will open up an environmentally friendly road for the production of domestic metallic coatings. Through the research on traditional solvent-based aluminum pigments, it is found that the coating of aluminum pigments has good heat insulation effect after coating. At pres...