Two-component coating compositions and high erosion resistance coatings produced therefrom

Patent metadata

Field	Value
Publication number	US-10370559-B2
Application number	US-201415118328-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Feb 13, 2014
Publication date	Aug 6, 2019
Grant date	Aug 6, 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 polyaspartic ester, and (C) at least one filler modified with at least one organosilane, and (2) a hardener component comprising (D) at least one hexamethylene diisocyanate isocyanurate containing aliphatic polyester groups and having an isocyanate content of 5% to 23%. The present invention also relates to a method for producing a coating using the coating composition, and to the coatings produced accordingly.

First claim

The invention claimed is:

1. A two-component coating composition, comprising:
(1) a paint base component comprising
(A) at least one polycarbonate diol,
(B) at least one polyaspartic ester, and
(C) at least one filler modified with at least one organosilane; and

(2) a hardener component comprising
(D) at least one hexamethylene diisocyanate isocyanurate containing aliphatic polyester groups and having an isocyanate content of 5% to 23%.

2. The two-component coating composition as claimed in claim 1 , wherein said at least one polycarbonate diol (A) has an OH number of 50 to 500 mg KOH/g.

3. The two-component coating composition as claimed in claim 1 , wherein said at least one polycarbonate diol (A) is an aliphatic and linear polycarbonate diol.

4. The two-component coating composition as claimed in claim 1 , wherein said at least one polyaspartic ester (B) has an amine number of 120 to 300 mg KOH/g.

5. The two-component coating composition as claimed in claim 1 , wherein said at least one polyaspartic ester (B) is aliphatic.

6. The two-component coating composition as claimed in claim 1 , wherein said at least one filler (C) is a silicate modified with the at least one organosilane.

7. The two-component coating composition as claimed in claim 1 , wherein said at least one filler (C) modified with at least one organosilane is preparable by modification of an inorganic filler with organosilanes of the formula (V)
X 4-n-m Si—R n (-A-B) m   (V)

where
X =OH, halogen, or alkoxy;
R =alkyl;
A =divalent organic radical;
B =amino, hydroxyl, epoxy, epoxypropyloxy, hydroxyalkyl, acetoxy, isocyanate, acryloyloxy, methacryloyloxy, imidazole, ureido, or a vinyl group; and
n, m =0, 1, 2, or 3, with n+m≤3.

8. The two-component coating composition as claimed in claim 1 , wherein the at least one hexamethylene diisocyanate isocyanurate containing aliphatic polyester groups is present, based on the total amount of polyisocyanates present in the coating composition, in a fraction of at least 50 wt %.

9. A method for producing a coating on a substrate, the method comprising application of a coating composition of claim 1 to a substrate.

10. The method as claimed in claim 9 , wherein the coating produced by application is cured at a temperature of not more than 80° C.

11. The method as claimed in claim 9 , wherein the substrate is a metal substrate or a plastic substrate.

12. A coating producible by a method of claim 9 .

13. A multicoat coating, comprising as topcoat a coating as claimed in claim 12 .

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

15. A process for improving the erosion resistance of a substrate, the process comprising coating the substrate with the two-component coating composition of claim 1 to obtain a coated substrate having improved erosion resistance compared to the substrate.

Assignees

• Basf Coatings Gmbh

Inventors

• Hohnholz Dieter
• BOELKE Oliver
• Krupp Julia

Classifications

• C08G18/792

  formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates · CPC title

• C08G18/42

  Polycondensates having carboxylic or carbonic ester groups in the main chain · CPC title

• C08G18/73

  acyclic · CPC title

• C08G18/6229

  Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols · CPC title

• C08G18/3821

  Carboxylic acids; Esters thereof with monohydroxyl compounds · CPC title