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Polyisocyanate composition and two-package type coating composition using the same

A technology of polyisocyanate and isocyanurate, applied in the field of polyisocyanate composition and two-component type coating composition, to achieve the effects of excellent recoatability, excellent solubility and good compatibility

Active Publication Date: 2011-04-13
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The polyisocyanates of the above-mentioned Patent Document 1 and Patent Document 2 are excellent in solubility to weakly polar organic solvents, but in terms of various physical properties such as compatibility with the polyol compound of the main ingredient and the surface hardness of the resulting coating film, room for further improvement
In addition, the selection of weak polar solvents also has room for improvement.

Method used

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  • Polyisocyanate composition and two-package type coating composition using the same
  • Polyisocyanate composition and two-package type coating composition using the same
  • Polyisocyanate composition and two-package type coating composition using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] In a four-neck flask with a capacity of 1 liter equipped with a stirrer, a thermometer, a condenser tube, and a nitrogen gas introduction tube, 880 g of hexamethylene diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., NCO content: 49.9% by mass, hereinafter referred to as HDI ) and 120 g of tridecanol (manufactured by Kyowa Hakko Kogyo Co., Ltd.), were heated to 85° C. while stirring them, and a carbamate reaction was performed for 3 hours.

[0076] Thereafter, 0.1 g of tin octoate (manufactured by Nippon Kagaku Sangyo Co., Ltd.), which is a catalyst for allophanation and isocyanuration, was added to the reaction solution, and the reaction was carried out at 110° C. until the specified NCO content was reached. Then, 0.4 g of acid phosphate ester (JP-508, manufactured by Seonghoku Chemical Industry Co., Ltd.) as a reaction terminator was added, and the reaction was terminated at 50° C. for 1 hour.

[0077] The reaction product was removed by thin film ...

Embodiment 2～4

[0079] Modified polyisocyanates S-2 to S-4 were obtained in the same procedure as in Example 1 except that, as shown in Table 1, the charged amount of the catalyst and the like and the NCO content were changed.

Embodiment 5

[0081] In a four-neck flask with a capacity of 1 liter equipped with a stirrer, a thermometer, a condenser, and a nitrogen inlet pipe, 850 g of HDI (manufactured by Nippon Polyurethane Industry Co., Ltd., NCO content: 49.9% by mass) and 150 g of KALCOL 200GD (2-octyl Diodecanol, manufactured by Kao Co., Ltd.) was heated to 85° C. while stirring them, and a urethanization reaction was performed for 3 hours.

[0082] Thereafter, 0.2 g of tin octoate (manufactured by Nippon Kagaku Sangyo Co., Ltd.), which is a catalyst for allophanation and isocyanuration, was added to the reaction solution, and the reaction was carried out at 110° C. until a predetermined NCO content was reached. Then, 0.8 g of acid phosphate (JP-508, manufactured by Seonghoku Chemical Industry Co., Ltd.) as a reaction terminator was added, and the reaction was terminated at 50° C. for 1 hour.

[0083] The reaction product was removed by thin film distillation (conditions: 140°C, 0.04kPa) to remove excess HDI to...

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Abstract

Disclosed is a polyisocyanate composition containing a polyisocyanate, which is obtained by reacting hexamethylene diisocyanate and an aliphatic monoalcohol having 11-20 carbon atoms, and a low-polarity organic solvent having an aniline point of 10-70 DEG C or a low-polarity organic solvent having a mixed aniline point of 5-50 DEG C. The polyisocyanate contains an allophanate group, an isocyanurate group and a urethane group in a molecule, and the molar ratio between the allophanate group and the isocyanurate group, namely allophanate group / isocyanurate group, is from 70 / 30 to 30 / 70. The composition is soluble in a low-polarity organic solvent, and has excellent compatibility with a polyol compound. Consequently, the composition can provide a coating film having excellent physical properties such as surface hardness.

Description

technical field [0001] The present invention relates to a polyisocyanate composition and a two-component coating composition using the same. Background technique [0002] Two-component urethane-based coatings using polyisocyanate as one component have been used for coating outdoor substrates such as buildings and civil engineering structures because they can provide coating films with excellent weather resistance and abrasion resistance. , car repair, plastic coating, etc. [0003] Due to the high polarity of polyisocyanate, strong solvents such as aromatic hydrocarbon solvents such as toluene and xylene, and ester solvents such as butyl acetate are usually used in this coating, that is, solvents with strong solubility are used. [0004] These strong solvents tend to be avoided in recent years because of their strong odor, from the viewpoint of improving the working environment and reducing the load on the global environment. Furthermore, when repainting the old paint film...

Claims

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Application Information

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IPC IPC(8): C08G18/79C09D7/12C09D175/04
CPCC08G18/7837C07C275/60C08G18/73C08G18/6216C08G18/092C08G18/2825C09D175/04C08G18/792
Inventor 岸本龙介松下伸一森川幸弘
Owner NIPPON POLYURETHANE IND CO LTD
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