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Novel block polyisocyanate and urethane composition containing the same

A polyisocyanate, isocyanate-based technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of increased energy cost, insufficient coating hardness, carbon dioxide gas generation, etc., to achieve excellent weather resistance, high coating hardness, The effect of excellent low temperature curability

Active Publication Date: 2010-11-24
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology achieves a certain degree of low-temperature curability, but sometimes the hardness of the cured coating film is insufficient
[0007]When high temperature is required for curing, it will lead to the generation of carbon dioxide gas and the increase of energy cost, so further low temperature curing is urgently needed

Method used

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  • Novel block polyisocyanate and urethane composition containing the same
  • Novel block polyisocyanate and urethane composition containing the same
  • Novel block polyisocyanate and urethane composition containing the same

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0097] (Manufacture example 1: Manufacture of polyisocyanate)

[0098] Make a four-necked flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen gas introduction tube, and a dropping funnel in a nitrogen atmosphere, and add 600 parts of HDI and 30 parts of polycaprolactone-based polyester triol as a triol " PLACCEL 303" (trade name of DAICELCHEMICAL INDUSTRIES, LTD., molecular weight 300), under stirring, the temperature in the reactor was kept at 90°C for 1 hour to carry out pre-reaction. Thereafter, the temperature in the reactor was kept at 80° C., tetramethylammonium octanoate was added as a catalyst for the isocyanuration reaction, and when the yield reached 54%, phosphoric acid was added to stop the reaction. After filtering the reaction solution, unreacted HDI was removed using a thin film evaporation tank. The obtained polyisocyanate had a viscosity of 9500 mPa·s at 25°C, an isocyanate group content of 19.2% by mass, a number average molecular we...

manufacture example 2～6

[0100] Production was carried out in the same manner as in Production Example 1 except that the feed composition and reaction conditions shown in Table 1 were used. Table 1 shows the results of properties of the obtained polyisocyanate.

Embodiment 1

[0108] A four-neck flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen gas introduction tube, and a dropping funnel was made into a nitrogen atmosphere, and 500 parts of the polyisocyanate obtained in Production Example 1 and 169 parts of xylene were added and mixed. Further, 230 parts of 3,5-dimethylpyrazole (isocyanate group / 3,5-dimethylpyrazole=1.05 (equivalent ratio)) were added and mixed. The temperature of this mixed solution was raised to 60°C. Hold until the characteristic absorption of the isocyanate group disappears when the mixed solution is sampled and measured by infrared spectroscopy.

[0109] The blocked polyisocyanate (curing agent) of the present invention having a solid content of 80% by mass and an effective isocyanate group concentration of 13.4% (blocked polyisocyanate basis) was obtained.

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Abstract

Disclosed is a block polyisocyanate obtained by blocking at least a part of isocyanate groups of a polyisocyanate, which is derived from an aliphatic diisocyanate and a polyol and satisfies all of the conditions (1)-(5) shown below, with a pyrazole compound. (1) Average number of isocyanate groups: 3.0-20 (2) Diisocyanate monomer trimer concentration: 10-50% by mass (3) Isocyanate group concentration: 5-22% by mass (4) Polyol content concentration: 5-40% by mass (5) Diisocyanate monomer concentration: 3% by mass or less.

Description

technical field [0001] The present invention relates to a blocked polyisocyanate having low-temperature curability and realizing a high coating film appearance, and a urethane composition containing the same. Background technique [0002] Urethane-based coating compositions using polyisocyanate as a curing agent are excellent in chemical resistance, flexibility, and the like of the coating film. Especially when polyisocyanates obtained from aliphatic and alicyclic diisocyanates are used, they also have excellent weather resistance, so they are used as room-temperature-curable two-component urethane coatings and thermosetting one-component urethane coatings. It is used in the form of ester paint, involving many aspects such as construction, heavy duty, automobile, industrial use and its repair. [0003] Thermosetting one-component urethane coatings do not react at room temperature and have excellent storage stability, so there is no need to mix polyols and polyisocyanates ju...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/80
CPCC08G18/6216C08G2105/02C08G18/092C08G18/807C09D175/04C08G18/10C08G18/4277C08G2115/02C08G18/285
Inventor 朝比奈芳幸皆川泠
Owner ASAHI KASEI KK
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