Two-component coating compositions and coatings produced therefrom for improving erosion resistance

Patent metadata

Field	Value
Publication number	US-10519340-B2
Application number	US-201515322601-A
Country	US
Kind code	B2
Filing date	Apr 28, 2015
Priority date	Jul 2, 2014
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

The present invention relates to a two-component coating composition comprising (1) a paint base component comprising (A) at least one polycarbonate diol, (B) at least one diamine having secondary amino groups and having an aliphatic group (b1) between the nitrogen atoms of the amino groups, and also (2) a hardener component comprising (C) at least one polyisocyanate-modified polyester having an isocyanate content of 4% to 15%. The present invention also relates to a method for coating substrates by applying the coating composition, and to the use thereof.

First claim

The invention claimed is:

1. A two-component coating composition, comprising:
(1) a paint base component, comprising:
(A) at least one aliphatic and linear polycarbonate diol having an OH number of 100 to 500 mg KOH/g,
(B) at least one diamine comprising secondary amino groups and having an aliphatic group (b1) between the nitrogen atoms of the amino groups, and

(2) a hardener component, comprising:
(C) at least one polyisocyanate-modified polyester having an isocyanate content of 4% to 15%,

wherein the two-component coating composition does not comprise a wax, a wax-like compound, or both.

2. The two-component coating composition as claimed in claim 1 , wherein said at least one aliphatic and linear polycarbonate diol (A) has an OH number of 150 to 400 mg KOH/g.

3. The two-component coating composition as claimed in claim 1 , wherein said at least one diamine (B) has an amine number of 300 to 500 mg KOH/g.

4. The two-component coating composition as claimed in claim 1 , wherein the aliphatic group (b1) of the diamine (B) is cycloaliphatic.

5. The two-component coating composition as claimed in claim 1 , wherein the diamine (B) has the following formula (II):
(b2)-NH-(b1)-NH-(b2)  (II)

where
(b1)=aliphatic group having 4 to 30 carbon atoms,
(b2)=independently at each occurrence, —CH 2 CH 2 —CN and/or —CH 2 CH 2 —C(O)—O—C n H 2n+1 with n=1 to 6.

6. The two-component coating composition as claimed in claim 1 , wherein the polyisocyanate-modified polyester (C) is a hexamethylene diisocyanate-modified polyester.

7. The two-component coating composition as claimed in claim 1 , wherein the modified polyester (C) is prepared by reacting hexamethylene diisocyanate with a hydroxy-functional aliphatic polyester.

8. The two-component coating composition as claimed in claim 7 , wherein the hydroxy-functional aliphatic polyester used for the reaction is a polycaprolactone polymer.

9. A method for producing a coating on a substrate, comprising:
applying a coating composition as claimed in claim 1 to a substrate to produce a coating on said substrate.

10. The method as claimed in claim 9 , further comprising:
curing the coating present on said substrate at a temperature of not more than 80° C.

11. A coating produced by a method as claimed in claim 1 .

12. A multicoat coating which comprises as topcoat a coating as claimed in claim 11 .

13. A substrate coated with a coating as claimed in claim 11 .

14. A substrate coated with a multicoat coating as claimed in claim 12 .

15. The two-component coating composition as claimed in claim 1 , wherein
the paint base component consists of
(A) one polycarbonate diol,
(B) one diamine comprising secondary amino groups and having an aliphatic group (b1) between the nitrogen atoms of the amino groups, and
the hardener component consists of (C) one polyisocyanate-modified polyester having an isocyanate content of 4% to 15%.

16. The two-component coating composition as claimed in claim 1 , wherein the at least one aliphatic and linear polycarbonate diol is prepared with a diol selected from the group consisting of 3-methyl-1,5-pentanediol and 1,6-hexanediol.

17. The two-component coating composition as claimed in claim 1 , wherein the at least one aliphatic and linear polycarbonate diol is a linear alkyl polycarbonate diol.

Assignees

• Basf Coatings Gmbh

Inventors

• Hohnholz Dieter
• Seeger Dirk
• Piecha Christoph

Classifications

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title

• C08G18/44

  Polycarbonates · CPC title

• C08G18/6651 Primary

  with compounds of group C08G18/3225 or polyamines of C08G18/38 · CPC title

• C09D175/04

  Polyurethanes · CPC title

• B05D3/007

  After-treatment · CPC title