Hydrophobic and oleophobic coating composition

• US 9,382,441 B2
• Filed: 06/27/2013
• Issued: 07/05/2016
• Est. Priority Date: 06/29/2012
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Liang, Xinyu, Hao, Lifei, Yang, Yu, Song, Minhao, Xia, KeFeng
• Primary Examiner(s): Loewe, Robert S
• Application Number:
  US14/411,199
• Publication Number:
  US 20150141563A1
• Time in Patent Office: 1,104 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: C03C 17/30 with silicon-containing compounds
• CPC Class Codes: C03C 2217/76 Hydrophobic and oleophobic coatings
• CPC Class Codes: C08G 77/24 halogen-containing groups
• CPC Class Codes: C08K 3/16 Halogen-containing compounds
• CPC Class Codes: C08K 5/09 Carboxylic acids; Metal salts thereof; Anhydrides thereof
• CPC Class Codes: C08K 5/092 Polycarboxylic acids
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
• CPC Class Codes: C09D 133/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C09D 133/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09D 183/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen

Abstract

The present disclosure provides a hydrophobic and oleophobic coating composition, which comprises the following components based on weight percentage: 0.1-15% of a fluorosiloxane, 1-30% of a polyacrylic resin, 0.1-15% of a silane coupler, 33-98% of an organic solvent, and 0.05-15% of an acid. By combining the polyacrylic resin and the fluorosiloxane which exhibits hydrophobic property, the present composition not only provides good hydrophobic property but also ensures durable hydrophobic property of the coating with the help of good adhesion of polyacrylic resin. The coating composition can form hard coating which has high glossiness and high transparency under relatively low temperatures and has a contact angle of 115-120°. This coating composition can be used on surfaces of substrates, such as automotive paints, metal, plastic and glass, and it can retain long lasting hydrophobic and oleophobic property even placed outdoors for several months, and it can also prevent the surface of the substrate from being scratched.

Claims

1. A coating composition, which comprises the following components based on weight percentage:

0.1-15% of a fluorosilane,

1-30% of a polyacrylic resin,

0.1-15% of a silane coupler,

0.05-15% of an acid,

33-98% of an organic solvent;

wherein the polyacrylic resin is in the form of hydroxy modified polyacrylic resin emulsion.

2. The coating composition according to claim 1, characterized in that the fluorosilane is represented by the formula (I):

CF₃(CF₂)_a(CH₂)_b—

Si(OCH₂CH₃)₃ 

 

(I)

wherein, a is 3-10, and b is 1-7.

3. The coating composition according to claim 1, characterized in that the fluorosilane is perfluoro polyether siloxane.

4. The coating composition according to claim 3, characterized in that the fluorosilane is perfluoro polyether siloxane represented by formula (II):

(C₂H₅O)₃Si(C)₃N(H(C(O)—

R_f—

C)N(H)(CH₂)₃Si(OC₂H₅)₃ 

 

(II)

wherein R_f is CF₂O(CF₂CF₂O)_n(CF₂O)_mCF₂, n and m are independently 1-20.

5. The coating composition according to claim 4, characterized in that n and m are independently 9-10.

6. The coating composition according to claim 1, characterized in that the silane coupler is at least one selected from the group consisting of the following compounds:

7. The coating composition according to claim 6, characterized in that the silane coupler is:

9. The coating composition according to claim 1, characterized in that the acid is at least one selected from of the group consisting of hydrochloric acid, sulfuric acid, acetic acid, citric acid and lactic acid.

10. A method for preparing the coating composition according to claim 1, comprising the following steps:

a) mixing the organic solvent, the polyacrylic resin, the silane coupler and the fluorosiloxane to yield a clear mixture;

b) adding the acid into the mixture, and stirring it until the mixture being clear; and

c) allowing the mixture obtained in step b) to stand for aging.

11. The method according to claim 10, characterized in that in step b) the mixture is stirred for 1-3 hrs.

12. The method according to claim 10, characterized in that in step c) the mixture is aged for at least 1 day.

13. A method for preparing the coating composition according to claim 1, comprising:

mixing the fluorosiloxane and acid to obtain a first mixture, and mixing the organic solvent, the polyacrylic resin and the silane coupler to obtain a second mixture, and then mixing the first mixture and the second mixture, followed by stirring and aging.

14. The method according to claim 13, characterized in that the stirring takes 1-3 hrs.

15. The method according to claim 13 or 14, characterized in that the aging takes at least 1 day.

8. A coating composition, which comprises the following components based on weight percentage:

0.1-15% of a fluorosilane,

1-30% of a polyacrylic resin,

0.1-15% of a silane coupler,

0.05-15% of an acid,

33-98% of an organic solvent;

wherein the organic solvent is at least one selected from the group consisting of acetone and methyl ethyl ketone.