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Polyisocyanates composition, coating composition, and coating method

A technology of polyisocyanate and diisocyanate, which is applied in the field of polyisocyanate composition, can solve the problems of bad influence of combustion catalyst and different effects, and achieve the effect of excellent coating film appearance and high curing property

Active Publication Date: 2016-03-23
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve curability, for example, there is a method of adding an organic tin compound, but this method has the following problems: the effect may vary depending on the composition of the paint, and it may adversely affect the combustion catalyst in the treatment device for the organic solvent volatilized during painting, etc. Wait

Method used

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  • Polyisocyanates composition, coating composition, and coating method
  • Polyisocyanates composition, coating composition, and coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] A 4-neck flask equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen blowing tube was made into a nitrogen atmosphere, and 600 parts of HDI and 10.8 parts of 1,3-butanediol as a dihydric alcohol were put in, and the temperature in the reactor was lowered under stirring. It maintained at 90 degreeC for 1 hour, and performed the urethanization reaction. After that, the temperature in the reactor was kept at 80°C, 0.03 part of tetramethylammonium octanoate was added as an isocyanurate catalyst, and the refractive index of the reaction solution was measured. When the yield became 55%, phosphoric acid was added to stop the reaction. . After filtering the reaction solution, unreacted HDI was removed using a thin film evaporation tank. 343 g of the obtained polyisocyanate composition had a non-volatile content of 99.8% by mass, a viscosity at 25°C of 20400 mPa·s, an isocyanate group concentration of 19.3% by mass, a diisocyanate monomer concentration of 0...

Embodiment 2

[0110] A 4-neck flask equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen blowing tube was made into a nitrogen atmosphere, and 600 parts of HDI and 24 parts of 1,3-butanediol as a dihydric alcohol were put in, and the temperature in the reactor was lowered under stirring. It maintained at 90 degreeC for 1 hour, and performed the urethanization reaction. After that, the temperature in the reactor was kept at 80°C, 0.03 part of tetramethylammonium octanoate was added as an isocyanurate catalyst, and the refractive index of the reaction solution was measured. When the yield became 55%, phosphoric acid was added to stop the reaction. . After filtering the reaction solution, unreacted HDI was removed using a thin film evaporation tank. 343 g of the obtained polyisocyanate composition had a nonvolatile content of 99.8% by mass, a viscosity at 25°C of 14000 mPa·s, an isocyanate group concentration of 19.1% by mass, a diisocyanate monomer concentration of 0.09...

Embodiment 3～7

[0112] Synthesis was carried out in the same manner as in Example 1, except that the composition and reaction conditions of the charged raw materials were changed to those shown in Table 1. Table 1 shows the composition and reaction conditions of these input raw materials and the physical properties of this polyisocyanate composition.

[0113] Table 2 shows the compatibility evaluation results of the polyisocyanate compositions obtained in Examples 1 to 7.

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Abstract

The present invention provides a polyisocyanates composition which expresses high curing characteristic, drying characteristic and crosslinking degree, and also has excellent performance in coating appearance such as smoothness of the coating surface, a coating composition comprising the same, and a coating method. The polyisocyanates composition is formed by more than one diisocyanate selected from aliphatic diisocyanate and alicyclic diisocyanate and more than one diol. In the polyisocyanates composition, the mole ratio of allophanate group / (isocyanurate group + allophanate group) is 0.2-0.9, and the mole ratio of allophanate group / (allophanate group + urethane group) is 0.6-1.0.

Description

technical field [0001] The present invention relates to a polyisocyanate composition, a coating composition and a coating method. Background technique [0002] Urethane resin coatings have been known to have excellent abrasion resistance, chemical resistance, and stain resistance, especially polyurethane resins using non-yellowing polyisocyanates derived from hexamethylene diisocyanate and isophorone diisocyanate The coating also has excellent weather resistance. Therefore, the use of such polyisocyanate is used in various aspects such as construction, multi-protection, automobile, industrial use and repair thereof in the form of two-liquid urethane coatings cured at room temperature or heat. In each use, an improvement in curability is desired in order to shorten the process and the like. [0003] In order to improve curability, for example, there is a method of adding an organic tin compound, but this method has the following problems: the effect may vary depending on th...

Claims

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Application Information

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IPC IPC(8): C08G18/73C08G18/32C08G18/75C09D175/04
CPCC08G18/3206C08G18/722C08G18/73C08G18/755C09D175/04
Inventor 洪昌峰渡边慎一郎
Owner ASAHI KASEI KK
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