US 11,939,489 B2
Solution composition for surface treatment of steel sheet and surface-treated steel sheet using same
Chang-Hoon Choi, Pohang-si (KR); Dong-Yun Kim, Anyang-si (KR); Min-Ho Jo, Pohang-si (KR); Jae-Duck Ko, Anyang-si (KR); Won-Ho Son, Pohang-si (KR); and Jong-Hwa Kim, Pohang-si (KR)
Assigned to POSCO CO., LTD, Pohang-si (KR); and NOROO COIL COATINGS CO., LTD., Pohang-si (KR)
Appl. No. 16/337,575
Filed by POSCO, Pohang-si (KR); and NOROO COIL COATINGS CO., LTD., Pohang-si (KR)
PCT Filed Sep. 28, 2017, PCT No. PCT/KR2017/010862
§ 371(c)(1), (2) Date Mar. 28, 2019,
PCT Pub. No. WO2018/062912, PCT Pub. Date Apr. 5, 2018.
Claims priority of application No. 10-2016-0124991 (KR), filed on Sep. 28, 2016.
Prior Publication US 2020/0032080 A1, Jan. 30, 2020
Int. Cl. C09D 5/08 (2006.01); C08G 77/04 (2006.01); C08K 3/24 (2006.01); C08K 3/30 (2006.01); C08K 3/36 (2006.01); C08K 5/05 (2006.01); C08K 5/09 (2006.01); C08L 83/06 (2006.01); C09D 4/00 (2006.01); C09D 7/40 (2018.01); C09D 133/08 (2006.01); C09D 175/04 (2006.01); C09D 183/04 (2006.01)
CPC C09D 5/08 (2013.01) [C08K 3/24 (2013.01); C08K 3/36 (2013.01); C08K 5/05 (2013.01); C08K 5/09 (2013.01); C09D 4/00 (2013.01); C09D 7/67 (2018.01); C09D 133/08 (2013.01); C09D 175/04 (2013.01); C09D 183/04 (2013.01); C08G 77/04 (2013.01); C08K 2003/309 (2013.01); C08K 2201/005 (2013.01); C08L 83/06 (2013.01)] 6 Claims
 
1. A solution composition for surface treatment of a steel sheet, comprising:
30 to 50 wt % of colloidal silica containing 5 to 20 nm-sized silica particles;
40 to 60 wt % of silane containing at least three or more alkoxy groups;
5 to 15 wt % of an acrylate-based organic monomer;
0.01 to 1 wt % of acid;
0.1 to 5.0 wt % of an organic resin having a cyclic ring structure; and
1 to 15 wt % of a solvent,
wherein the organic resin having the cyclic ring structure is at least one selected from the group consisting of polyurethane; an amino-modified phenolic resin; a polyester resin; and polyvinyl butyral, or a hybrid resin of two or more thereof, and
wherein an acidity of the solution has a pH range of 1 to 5.