US 12,215,426 B2
Composite coating for eliminating pollution by heavy metal chromium and VOCs from source and preparation method
Kai Zhang, Guangdong (CN); Shichao Yang, Guangdong (CN); and Yang Ma, Guangdong (CN)
Assigned to GUANGDONG PROVINCIAL ACADEMY OF BUILDING RESEARCH GROUP CO., LTD, Guangdong (CN)
Appl. No. 17/775,592
Filed by GUANGDONG PROVINCIAL ACADEMY OF BUILDING RESEARCH GROUP CO., LTD, Guangdong (CN)
PCT Filed Feb. 24, 2020, PCT No. PCT/CN2020/076436
§ 371(c)(1), (2) Date May 10, 2022,
PCT Pub. No. WO2021/147135, PCT Pub. Date Jul. 29, 2021.
Claims priority of application No. 202010076541.8 (CN), filed on Jan. 23, 2020.
Prior Publication US 2022/0403525 A1, Dec. 22, 2022
Int. Cl. C23C 22/34 (2006.01); B05D 1/06 (2006.01); B05D 3/02 (2006.01); B05D 3/10 (2006.01); B05D 7/14 (2006.01); C09D 5/03 (2006.01); C09D 5/08 (2006.01); C09D 127/12 (2006.01); C23C 22/78 (2006.01)
CPC C23C 22/34 (2013.01) [B05D 1/06 (2013.01); B05D 3/0254 (2013.01); B05D 3/102 (2013.01); B05D 7/14 (2013.01); C09D 5/03 (2013.01); C09D 5/08 (2013.01); C09D 127/12 (2013.01); C23C 22/78 (2013.01)] 19 Claims
 
1. A composite coating for eliminating pollution by chromium and VOCs from a source, comprising a conversion film layer and a coating surface layer, wherein:
the conversion film layer is made from a surface pretreatment liquid, and the surface pretreatment liquid comprises the following components:
an organic compound A having an aromatic ring and at least two phenolic hydroxyl groups in the molecule thereof or a hydrate of the organic compound A;
an ionic compound B containing an element of zirconium and/or titanium and fluorine;
a mixed solution C containing manganese fluoride; and
an inorganic salt D containing potassium ions or sodium ions,
wherein the coating surface layer is a FEVE-type fluorocarbon powder coating layer,
wherein a molecular structure of the at least two phenolic hydroxyl groups in the molecule of the organic compound A is:

OG Complex Work Unit Chemistry
wherein R2, R3, R4, R5, and R6 are selected from H or OH, and at least two of R2, R3, R4, R5, and R6 are OH, and
R1 is selected from an amide group, a carboxyl group, or an aldehyde group.