A kind of coating method of high-strength nano-powder coating

Abstract

The invention provides a coating method of nanopowder coating with high strength. The coating method comprises the following steps: first, nano-catalyst powder, fluorinated acrylate monomers, unsaturated polyester resins, pigments and deionized water are mixed and subjected to ball grinding, and a nano-catalyst powder slurry is prepared; second, 0.5-5% of silicate, 1-3% of alkali compounds and 2-4% of hydroxyethyl methyl cellulose are mixed and compounded, and a binder slurry is prepared; third, the prepared nano-catalyst powder slurry is stirred at a high speed, the prepared binder slurry is dropwisely added slowly during the stirring process and a nano-catalyst compound slurry is prepared; fourth, porous carriers are dried and soaked in the nano-catalyst compound slurry, afterwards the porous carriers are taken out and blowed, the blowing interval time of every time is 5-10s, and the soaking time of every time is 3-5s, the above operations are repeatedly for 8-10 times until the weight of the porous carriers after being soaked in the nano-catalyst slurry is increased by 8-14% than that of the porous carriers before being soaked, and conventional drying and calcinations are carried out. The coating method is advantageous in that, nanocatalysts can be coated on porous carriers with large superficial area uniformly and firmly and have no influences on catalytic oxidation performance; the primary transformation rate of formaldehyde can reach 80-100%.

Description

technical field [0001] The invention relates to a method for coating a catalyst, in particular to a method for coating a high-strength nanometer powder coating. Background technique [0002] Formaldehyde is extremely harmful to the human body, causing respiratory diseases and possibly cancer. my country's "(Indoor Air Quality Standard)" GB / T18883-2002 clearly stipulates that the indoor formaldehyde concentration is less than 0.1mg / m3, and more than 60% of newly renovated houses exceed the standard, and the formaldehyde pollution situation is very serious. Catalytic oxidation of formaldehyde at room temperature is an effective technology for purifying and oxidizing formaldehyde. Chinese patents ZL200410102837.3, ZL200410047973.7, ZL200610011663.9, ZL200610011398.4 all mention the preparation method of this nano powder catalyst. However, in practical application, it is necessary to coat the catalyst powder on the surface of a porous carrier with a large surface area to form ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problem that the existing nano-catalysts are difficult to be evenly and firmly coated on the porous carrier with large surface area, which leads to the low conversion rate of formaldehyde, and to provide a method that can make the nano-catalyst uniformly and firmly coated on the porous carrier with large surface area. Above, the nano-catalyst coating method that can greatly improve catalyst activity, the catalyst film layer glossiness that uses the method for coating of the present invention is better, and adhesion is better