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Blocked polyisocyanate compound

一种嵌段异氰酸酯、多异氰酸酯的技术，应用在聚脲/聚氨酯涂料、涂层等方向，能够解决水性涂料固化性降低、涂膜附着性降低、贮存稳定性降低等问题，达到平滑性及鲜映性优异、优异附着性、贮存稳定性优异的效果

Active Publication Date: 2014-01-01
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if a blocked polyisocyanate compound in which isocyanate groups are blocked by an active methylene compound is used in water-based paint, the storage stability may decrease
Specifically, if an aqueous paint containing a blocked polyisocyanate compound in which isocyanate groups are blocked by an active methylene compound is applied after storage, the adhesion of the formed coating film may decrease.
It is generally believed that this is due to the dissociation of the active methylene compound in the blocked polyisocyanate compound during the storage of the water-based paint, and the generated isocyanate group reacts with the water in the water-based paint to deactivate, and the curability of the water-based paint after storage reduce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0416] "SUMIDURN-3300" (trade name, Sumika Bayer Urethane Co., Ltd., polyisocyanate containing an isocyanurate structure derived from hexamethylene diisocyanate, solid content about 100%, isocyanate group content rate 21.8%) 1610 parts, "Uniox M-550" (manufactured by NOF Corporation) , polyethylene glycol monomethyl ether, average molecular weight about 550) 275 parts and 2,6-di-tert-butyl-4-methylphenol 0.9 parts, mixed thoroughly, and heated at 130°C for 3 hours under nitrogen flow.

[0417] Then, 550 parts of ethyl acetate and 1150 parts of diisopropyl malonate were charged into the above-mentioned reaction vessel, and while stirring under nitrogen flow, 14 parts of 28% methanol solution of sodium methylate were added to the above-mentioned reaction vessel, and at 65 Stir at °C for 8 hours. The amount of isocyanate in the obtained resin solution was about 0.1 mol / kg. 3110 parts of 4-methyl-2-pentanol were added to the above-mentioned reaction vessel, and the solvent was d...

Embodiment 2

[0419] Change 275 parts of "UnioxM-550" to 275 parts of "UnioxM-400" (manufactured by NOF Corporation, polyethylene glycol monomethyl ether, average molecular weight about 400), and change the amount of diisopropyl malonate to 1120 Parts, the amount of 4-methyl-2-pentanol was 3040 parts, in addition, according to Example 1, 4870 parts of a blocked polyisocyanate compound (BN-2) solution were obtained. The simple trap contains 570 parts of isopropanol. The solid content concentration of the blocked polyisocyanate compound (BN-2) solution was about 60%. In addition, the amount of isocyanate in the resin solution before adding 4-methyl-2-pentanol was about 0.1 mol / kg.

Embodiment 3

[0421] In addition to 275 parts of "UnioxM-550", 25 parts of "PEG#600" (manufactured by NOF Corporation, polyethylene glycol, average molecular weight about 600) were added to change the amount of diisopropyl malonate to 1140 parts , In addition to changing the amount of 4-methyl-2-pentanol to 3080 parts, according to Example 1, 4930 parts of a blocked polyisocyanate compound (BN-3) solution were obtained. The simple trap contains 580 parts of isopropanol. The solid content concentration of the blocked polyisocyanate compound (BN-3) solution was about 60%. In addition, the amount of isocyanate in the resin solution before adding 4-methyl-2-pentanol was about 0.1 mol / kg.

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Abstract

The purpose of the present invention is to provide a blocked polyisocyanate compound having excellent storage stability. The blocked polyisocyanate compound of the present invention has a constitution characterized by having a hydrophilic group and at least one blocked isocyanate group selected from among the group comprising a blocked isocyanate group represented by general formula (I), a blocked isocyanate group represented by general formula (II) and a blocked isocyanate group represented by general formula (III).

Description

technical field [0001] The present invention relates to a blocked polyisocyanate compound, an aqueous coating composition containing the aforementioned blocked polyisocyanate compound, and a coated article obtained by coating the aforementioned aqueous coating composition. Background technique [0002] In recent years, heat-curable coatings have been required to be cured at lower temperatures from the viewpoint of reducing the amount of energy used in heating. In response to this requirement, as a curing agent, heat-curable coatings containing blocked polyisocyanate compounds in which isocyanate groups are blocked by active methylene compounds such as acetoacetate and malonate diester are processed at relatively low temperatures. Cured and therefore highly anticipated. [0003] In addition, recently, from the viewpoint of suppressing environmental pollution caused by volatilization of organic solvents, water-based coatings have been demanded. [0004] However, when a block...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/80C09D7/12C09D175/04C09D201/06
CPCC08G18/423C09D133/12C08G18/792C08L2201/54C08G18/8048C08G18/8093C08G18/4833C08G18/6254C09D175/04C08G18/8096C08G18/283C08G18/706C08G18/4063
Inventor 小畑政示北川博视北园和明
Owner KANSAI PAINT CO LTD
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