Antifouling paint composition

Abstract

To provide an antifouling coating composition that contains zinc oxide, yet exhibits excellent whitening resistance even when exposed to outdoor environments for extended periods, and can form an antifouling coating that maintains high antifouling performance over a long period. [Solution] An antifouling paint composition containing a hydrolyzable polymer (A), a phosphate ester compound (B), and zinc oxide (C), wherein the content of zinc oxide (C) is 7 to 50 parts by mass per 1 part by mass of the phosphate ester compound (B), and the hydrolyzable polymer (A) is a polymer other than a specific copolymer (EA).

Claims

1. It contains a hydrolyzable polymer (A), a phosphate ester compound (B), and zinc oxide (C), The content of zinc oxide (C) per 1 part by mass of the phosphate ester compound (B) is 7 to 50 parts by mass. The number average molecular weight of the hydrolyzable polymer (A) is 3,000 or less. The hydrolyzable polymer (A) comprises at least one selected from a constituent unit (i) derived from a metal ester group-containing monomer (M1) represented by the following formula (M1) and a constituent unit (ii) derived from a metal ester group-containing monomer (M2) represented by the following formula (M2), It consists of a constituent unit derived from an organosiloxane block-containing monomer (a2) represented by the following formula (a2), and at least one constituent unit selected from a triorganosilyl group-containing monomer (S1) and other monomers (a3) ​​other than the monomer (a2) (provided that the constituent unit is a constituent unit other than the constituent unit (i) and the constituent unit (ii) above), The hydrolyzable polymer (A) is a polymer other than the copolymer (EA) described below. The phosphate ester compound (B) is a triphosphate ester compound (b), The copolymer (EA) is a copolymer of a monomer (1) represented by the following formula (1) and an ethylenically unsaturated monomer (2) other than monomer (1), and is a copolymer having a weight-average molecular weight of 5,000 to 25,000. The monomer (1) includes a compound in which n in the following formula (1) is 2 or more. Antifouling paint composition. 【Chemistry 1】 [In formula (M1), R11 each independently represents a monovalent group containing a terminal ethylenically unsaturated group, and M represents a copper atom or a zinc atom.] 【Chemistry 2】 [In formula (M2), R21 represents a monovalent group containing a terminal ethylenically unsaturated group, R22 represents a monovalent organic group having 1 to 30 carbon atoms that does not contain a terminal ethylenically unsaturated group, and M represents a copper atom or a zinc atom.] 【Transformation 3】 [In formula (a2), R A, R B, and R C each independently represent a monovalent hydrocarbon group, X each independently represents a (meth)acryloyloxyalkyl group or a mercaptoalkyl group, m is 1 or greater, n is 0 or greater, p and q are each independently 0 or 1, and n + p + q is 1 or greater.] 【Chemistry 4】 [In formula (1), R １ R represents a hydrogen atom or a methyl group. ２ R represents a hydrogen atom, a methyl group, or a phenyl group. ３ [wherein, n represents an alkoxy group having 1 to 8 carbon atoms, or an alkyl group having 1 to 8 carbon atoms that may be substituted with a phenyl group, or a phenyl group, and n represents an integer from 1 to 10.]

2. The antifouling paint composition according to claim 1, wherein the content of zinc oxide (C) is 3% by mass or more based on 100% by mass of the nonvolatile content of the antifouling paint composition.

3. The antifouling paint composition according to claim 1, wherein the hydrolyzable polymer (A) contains a constituent unit (iii) derived from a metal ester group-containing monomer (M1-1) represented by the following formula (M1-1). 【Transformation 5】 [In formula (M1-1), R ３２ Each of these independently represents either a hydrogen atom or a methyl group, and M represents either a copper atom or a zinc atom.

4. The antifouling paint composition according to claim 1, wherein the content of the hydrolyzable polymer (A) is 1 to 50% by mass based on 100% by mass of the nonvolatile content of the antifouling paint composition.

5. The antifouling coating composition according to claim 1, wherein the triphosphate ester compound (b) comprises one or more compounds selected from the group consisting of tris(2-butoxyethyl) phosphate, tricresyl phosphate, and cresyl diphenyl phosphate.

6. An antifouling coating film formed from the antifouling coating composition according to any one of claims 1 to 5.

7. A substrate with an antifouling coating, comprising a base material and the antifouling coating described in claim 6.

8. Step (I) of applying or impregnating a substrate with the antifouling coating composition according to any one of claims 1 to 5 to obtain a coated body or an impregnated body, The process includes a step (II) of drying the coated or impregnated body. A method for manufacturing a substrate coated with an antifouling film.

9. A method for preventing fouling of a substrate, comprising the step of forming a fouling-resistant coating film according to claim 6 on at least a portion of the substrate.

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