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Highly crosslinkable low-viscosity polyisocyanate composition and coating composition containing same

A polyisocyanate and diisocyanate technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of limited use, low crosslinking, and increased monomer concentration.

Active Publication Date: 2008-10-22
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this technology, polyisocyanates of low viscosity are obtained, however, the crosslinkability is low, and the concentration of diisocyanate monomer increases when the polyisocyanate is stored, so its use is limited
A polyisocyanate containing only uretdione groups has a statistical average number of isocyanate groups (hereinafter referred to as the average number of isocyanate groups) in one molecule of polyisocyanate regardless of its molecular weight, and its crosslinkability is also poor.

Method used

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  • Highly crosslinkable low-viscosity polyisocyanate composition and coating composition containing same
  • Highly crosslinkable low-viscosity polyisocyanate composition and coating composition containing same
  • Highly crosslinkable low-viscosity polyisocyanate composition and coating composition containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] (Example 1) (manufacture of polyisocyanate composition)

[0132] Make the interior of the four-necked flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen blowing tube, and a dropping funnel into a nitrogen atmosphere, and put in 600 parts of HDI and 0.6 parts of isobutanol, and keep the temperature in the reactor at 80 °C under stirring. 2 hours. After that, an isocyanurate catalyst tetramethylammonium caprate was added to carry out isocyanurate reaction, and when the conversion rate reached 20%, phosphoric acid was added to stop the reaction. The mass concentration of uretdione dimer increased in this reaction is below 1%. The reaction liquid was further kept at 160° C. for 1 hour. Polyisocyanate containing uretdione groups is produced by heating. The reaction solution was filtered after cooling, and then unreacted HDI was removed using a thin film evaporator. Table 1 shows the characteristics of the obtained polyisocyanate composition.

Embodiment 2

[0134] It carried out similarly to Example 1 except having set the conversion rate of the isocyanuration reaction to 13%. The results are shown in Table 1.

Embodiment 3

[0136] It carried out similarly to Example 1 except having set the conversion rate of the isocyanuration reaction to 8%. The results are shown in Table 1.

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Abstract

Disclosed is a polyisocyanate composition derived from an aliphatic diisocyanate monomer and an alcohol, which satisfies all the conditions below in a state not containing the aliphatic diisocyanate monomer and a solvent. 1) Isocyanurate trimer concentration: 55-95 mass%; 2) Number ratio of allophanate groups derived from the alcohol to isocyanurate groups: 1-20%; 3) Uretdione dimer concentration: 2-25 mass%; 4) Viscosity at 25 DEG C: 150-800 mPas.

Description

technical field [0001] The present invention relates to a polyisocyanate composition having high crosslinkability, low viscosity and preferable storage stability and a coating composition containing it. Background technique [0002] Conventionally, polyurethane coating films formed from polyurethane coatings have excellent flexibility, chemical resistance, and stain resistance, and in particular, non-yellowing polymers derived from 1,6-hexamethylene diisocyanate (hereinafter referred to as HDI) are used. Isocyanate as a curing agent has better weather resistance of the coating film, and its demand is also increasing. [0003] In recent years, due to the strengthening of global environmental protection, technological development for reducing the viscosity of polyisocyanate used as a curing agent has been actively carried out. This is because the usage-amount of the organic solvent used for a coating composition can be reduced by reducing the viscosity of polyisocyanate (pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79
CPCC08G18/092C08G18/097C08G18/6229C08G18/7837C08G18/792C08G18/798C09D175/04C08G18/72C08G18/79
Inventor 朝比奈芳幸片川洋德
Owner ASAHI KASEI KK
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