US 11,939,487 B2
Spirooxazine photochromic exterior wall coating and preparation method thereof
Wen Zhan, Sanming (CN); Wangchuan Xiao, Sanming (CN); Yutao Zhang, Sanming (CN); Jinxing Su, Sanming (CN); Gaoshun Chen, Sanming (CN); Jiandong Lei, Sanming (CN); and Weiping Luo, Sanming (CN)
Assigned to CHINA MACHINERY FOUNDRY MATERIAL TECHNOLOGY (FUJIAN) CO., LTD, Sanming (CN)
Filed by China Machinery Foundry Material Technology (Fujian) Co., LTD, Sanming (CN)
Filed on May 8, 2023, as Appl. No. 18/313,472.
Claims priority of application No. 202210912995.3 (CN), filed on Jul. 31, 2022.
Prior Publication US 2024/0052194 A1, Feb. 15, 2024
Int. Cl. C09D 133/12 (2006.01); C08K 13/02 (2006.01); C09D 7/20 (2018.01); C09D 7/48 (2018.01); C09D 7/61 (2018.01); C08K 3/22 (2006.01)
CPC C09D 133/12 (2013.01) [C08K 13/02 (2013.01); C09D 7/20 (2018.01); C09D 7/48 (2018.01); C09D 7/61 (2018.01); C08K 2003/2241 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A spirooxazine photochromic exterior wall coating, comprising the following components by mass percent: 0.6%-1.5% of spirooxazine photochromic compound, 40%-45% of resin, 0.3%-1% of dispersant, 0.2%-0.3% of antifoamer, 1%-3% of additive, 22%-24% of pigment and 30%-32% of solvent, wherein the additive comprises 0.9 wt %-2 wt % of NaCl or KCl solution; the solvent is prepared by mixing ethanol, ethyl acetate and acetone by a mass a ratio of 4:3:3 or 2:1:1; and the spirooxazine photochromic compound comprises 1,3,3-trimethyl-3H-indolinospironaphthoxazine.