Polyaspartic coating composition, coating film, and coated article

Patent metadata

Field	Value
Publication number	US-12173180-B2
Application number	US-202318226361-A
Country	US
Kind code	B2
Filing date	Jul 26, 2023
Priority date	Mar 7, 2017
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A polyaspartic coating composition containing (A) an aspartic acid ester compound represented by the following formula (I)

wherein X is an n-valent organic group, and R 1 and R 2 are organic groups which are inert to the isocyanate group under a reaction condition, and n is an integer of 2 or more, and (B) a polyisocyanate component obtained by reacting one or more diisocyanate monomers selected from the group consisting of an aliphatic and alicyclic diisocyanate with a polycaprolactone polyol having a number-average molecular weight of 500 to 1,500, wherein a ratio of the polycaprolactone polyol to a total amount of the polyol is 20% by mass or more, the polyisocyanate component contains 10.0% by mass or less of an isocyanurate trimer, and an average number of isocyanate groups of the polyisocyanate component (B) is 2.4 to 8.0.

First claim

The invention claimed is:

1. A polyaspartic coating composition, comprising:
(A) an aspartic acid ester compound represented by the following formula (I)

wherein X is an n-valent organic group obtained by removing a primary amino group of an n-valent polyamine, and R 1 and R 2 are the same or different organic groups which are inert to the isocyanate group under a reaction condition, and n is an integer of 2 or more, and
(B) a polyisocyanate component obtained by reacting one or two or more diisocyanate monomers selected from the group consisting of an aliphatic and alicyclic diisocyanate with a polyol containing a polycaprolactone polyol having a number-average molecular weight of 500 to 1,500, wherein
a ratio of the polycaprolactone polyol to a total amount of the polyol is 20% by mass or more, and
the polyisocyanate component (B) contains more than 0% to 10.0% by mass of an isocyanurate trimer with respect to a total amount of the polyisocyanate component (B), and
an average number of isocyanate groups of the polyisocyanate component (B) is 2.4 to 8.0.

2. The polyaspartic coating composition according to claim 1 , wherein the polyol further contains a polyoxyalkylene polyol.

3. The polyaspartic coating composition according to claim 2 , wherein a ratio of the polyoxyalkylene polyol to a total amount of the polyoxyalkylene polyol and the polycaprolactone polyol is 80% by mass or less.

4. The polyaspartic coating composition according to claim 1 , wherein an equivalent ratio between the amino group of (A) the aspartic acid ester compound and the isocyanate group of the polyisocyanate component (B) is amino group:isocyanate group=10:1 to 1:10.

5. The polyaspartic coating composition according to claim 1 , wherein the diisocyanate monomer contains a hexamethylene diisocyanate.

6. A coating film formed from the polyaspartic coating composition defined in claim 1 .

7. A coated article comprising the coating film defined in claim 6 .

8. A method for preventing corrosion of a structure, comprising:
coating a structure with the polyaspartic coating composition defined in claim 1 .

9. The method according to claim 8 , wherein the structure is a bridge, a highway, a power transmission tower, or a wind power generation blade.

10. The polyaspartic coating composition according to claim 1 , wherein the polyisocyanate component (B) contains 2.7% to 10.0% by mass of the isocyanurate trimer with respect to a total amount of the polyisocyanate component (B).

Assignees

• Asahi Chemical Ind

Inventors

• Takeno Satoshi

Classifications

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title

• C08G18/32

  Polyhydroxy compounds; Polyamines; Hydroxyamines · CPC title

• B32B27/40

  comprising polyurethanes · CPC title

• B32B27/18

  characterised by the use of special additives · CPC title

• B05D7/24

  for applying particular liquids or other fluent materials · CPC title