Two-component water-based coating composition

A water-based paint and composition technology, applied in the direction of coating, can solve the problem of water resistance reduction of the coating film, and achieve the effect of reducing the content, excellent long-term storage, and reducing the discharge amount

Active Publication Date: 2015-07-29
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a large amount of the hydrophilic functional group remains in the formed coating film, and as a result, there is a problem that the water resistance of the coating film decreases.

Method used

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  • Two-component water-based coating composition
  • Two-component water-based coating composition
  • Two-component water-based coating composition

Examples

Experimental program
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Effect test

preparation example Construction

[0041]In the preparation of an acrylic emulsion having a carboxyl group, the emulsion polymerization in an aqueous medium can be carried out by, for example, dissolving an emulsifier in water or an aqueous medium containing a hydrophilic organic solvent such as alcohol, glycol, etc., under heating and stirring , a mixture of α,β-ethylenically unsaturated monomers used as raw materials and a polymerization initiator are added dropwise. A mixture obtained by mixing α,β-ethylenically unsaturated monomers used as raw materials may be previously emulsified using an emulsifier and water.

[0042] Examples of polymerization initiators that can be suitably used for emulsion polymerization include azo-based oily compounds (for example, azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile) and 2 ,2'-azobis(2,4-dimethylvaleronitrile), etc.), and aqueous compounds (for example, anionic 4,4'-azobis(4-cyanovaleric acid), 2,2 -Azobis(N-(2-carboxyethyl)-2-methylpropionamidine and cation...

preparation example 1

[0109] Preparation Example 1: Preparation of Carbodiimide Compounds Having Isocyanate Groups at Both Terminals

[0110] In 2500 parts of 4,4-dicyclohexylmethane diisocyanate, add 25 parts of 3-methyl-1-phenyl-phosphorol-2-ene-1-oxide as a carbodiimidation catalyst, It was made to react at 170 degreeC until the isocyanate equivalent weight became 436, and the carbodiimide compound 1 which has isocyanate group at both terminals was prepared. Carbodiimide compound 1 has 2.8 carbodiimide groups per molecule.

preparation example 2

[0111] Preparation Example 2: Preparation of Aqueous Dispersion of Carbodiimide Compound

[0112] As shown in Table 1, in 872 parts of the carbodiimide compound 1 prepared in Preparation Example 1, 567 parts of Neupore LB-65 (polypropylene glycol monobutyl ether number average repeat number 5 manufactured by Sanyo Chemical Industry) and MPG-081 ( Polyethylene glycol monomethyl ether manufactured by Nippon Emulsifier (Number average repeat number 15) 225 parts, reacted at 160°C until the absorption from isocyanate group in IR disappeared. It was further cooled to 60°C, and 2496 parts of deionized water was slowly added for emulsification to obtain a milky white carbodiimide aqueous dispersion 1 with a solid content of 40%.

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Abstract

The present invention provides a composition for a double-component waterborne coating which has the following advantages: high stability in long-term storage, excellent initial water resistance and luster of coating, and environment-friendly performance. The composition for the double-component waterborne coating comprises the following components: (A) waterborne acrylic resin with carboxyl; and (B) carbodiimide compound. The carbodiimide compound comprises polyelhylene glycol monoalkyl ether residues of which repetition number q of glycol is 6-40 and polyethylene glycol monoalkyl ether residues of which repetition number r of poly(propylene glycol) is 4-14, wherein, the molar ratio between the polyelhylene glycol monoalkyl ether residues and the polyethylene glycol monoalkyl ether residues is 1:1 to 1:15.

Description

technical field [0001] The invention relates to a two-component waterborne coating composition containing a carbodiimide curing agent. Background technique [0002] In the field of coatings, most solvent-based coatings have been used so far, but in recent years, from the viewpoint of environmental problems and the like, there is a tendency to gradually replace them with water-based coatings with a low organic solvent content. Water-based paints contain water-soluble or water-dispersible resins, and after coating, a coating film is formed by volatilization of solvent components such as water. [0003] However, in order to express water solubility or water dispersibility, the resin of the water-based paint is endowed with hydrophilic functional groups such as carboxyl groups. Therefore, a large amount of the hydrophilic functional group remains in the formed coating film, and as a result, there is a problem that the water resistance of the coating film decreases. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/00C09D133/12C09D133/08C09D7/12
Inventor 矢尾板聪西本善孝庄克彦
Owner NIPPON PAINT CO LTD
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