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Polyisocyanate composition, coating composition and coating substrate

A polyisocyanate and diisocyanate technology, applied in the field of polyisocyanate composition, can solve problems such as difficulty in dispersion and generation of carbon dioxide

Active Publication Date: 2020-10-02
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyisocyanate used as a curing agent in the two-component urethane coating composition has the problems of being difficult to disperse in water and easily reacting with water to generate carbon dioxide

Method used

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  • Polyisocyanate composition, coating composition and coating substrate
  • Polyisocyanate composition, coating composition and coating substrate
  • Polyisocyanate composition, coating composition and coating substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0346] Hereinafter, specific examples and comparative examples are given to describe the present embodiment more specifically, but the present embodiment is not limited to the following examples and comparative examples unless the gist is exceeded. In Examples and Comparative Examples, the physical properties and evaluation of the polyisocyanate composition were measured as follows. In addition, unless otherwise stated, "part" and "%" mean "part by mass" and "% by mass".

[0347]

[0348] [Physical property 1] Viscosity

[0349] The viscosity of the polyisocyanate component obtained in the Example and the comparative example was measured at 25 degreeC using the E-type viscometer (made by Tokimec, Inc.). A standard rotor (1°34'×R24) was used for the measurement. The rotation speed is as follows.

[0350] 100rpm (less than 128mPa·s)

[0351] 50rpm (over 128mPa·s and less than 256mPa·s)

[0352] 20rpm (over 256mPa·s and less than 640mPa·s)

[0353] 10rpm (over 640mPa·s an...

manufacture example 1

[0478] [Production example 1] Production of polyisocyanate P-1

[0479]Make the 4-neck flask equipped with stirrer, thermometer, reflux condenser, nitrogen blowing pipe and dropping funnel a nitrogen atmosphere, add HDI 1000g and isobutanol 4.0g, keep the temperature in the reactor at 70°C under stirring, Tetramethyloctanoic acid ammonium was added thereto, and when the yield reached 50%, phosphoric acid was added to stop the reaction. Next, the temperature was raised to 160° C. and maintained for 1 hour. After filtering the reaction solution, unreacted HDI was removed with a thin film evaporator to obtain polyisocyanate P-1. The obtained polyisocyanate P-1 had a viscosity at 25° C. of 900 mPa·s and an isocyanate group content of 22.3%.

manufacture example 2

[0480] [Production example 2] Production of polyisocyanate P-2

[0481] When the yield reached 55%, phosphoric acid was added to stop the reaction, and polyisocyanate P-2 was obtained by the method similar to manufacture example 1. The obtained polyisocyanate P-2 had a viscosity at 25° C. of 1200 mPa·s and an isocyanate group content of 22.6%.

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PUM

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Abstract

A polyisocyanate composition which contains a polyisocyanate containing a sulfonic acid anion group in the molecules thereof, contains tertiary ammonium cations of an amine compound, and also containsan uretdione dimer of a diisocyanate monomer and an isocyanurate trimer thereof, wherein the tertiary ammonium cations of the amine compound include tertiary ammonium cations of one or more types ofamine compound represented by general formula (1); the content of the uretdione dimer is 2.0-20.0 mass%, inclusive, relative to the total mass of the composition; and the content of uretdione dimers containing a sulfonic acid anion group in the molecules thereof is 0.15 mass% or less of the total combined mass of the polyisocyanate containing the sulfonic acid anion group in the molecules thereof,the uretdione dimer and the isocyanurate trimer.

Description

technical field [0001] The present invention relates to polyisocyanate compositions, coating compositions and coated substrates. This application claims priority based on Japanese Patent Application No. 2018-062036 for which it applied in Japan on March 28, 2018, and uses the content here. Background technique [0002] In recent years, from the viewpoint of environmental protection, the water-based conversion of room-temperature crosslinkable two-component urethane coating compositions conventionally used as solvent-based coatings has been desired. However, the polyisocyanate used as a curing agent in the two-component urethane coating composition has the problems of being difficult to disperse in water and easily reacting with water to generate carbon dioxide. Therefore, polyisocyanates having high emulsifiability and suppressing the reaction of isocyanate groups with water in a water-dispersed state are being developed. [0003] Patent Document 1 discloses a reaction pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/08C08G18/28C08G18/79C09D5/02C09D7/63C09D175/04
CPCC08G18/28C09D175/04C09D5/02C08G18/0828C08G18/706C08G18/791C08G18/798
Inventor 辻田隼也
Owner ASAHI KASEI KK