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Polyisocyanate composition with stable flocculation and preparation method thereof

A polyisocyanate and diisocyanate technology, applied in the field of polyisocyanate compositions and their preparation, can solve the problems of affecting downstream applications, decomposing products consuming NCO groups and the like, and achieving the effect of excellent flocculation stability

Active Publication Date: 2021-06-11
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the prior art is to solve the flocculation problem of isocyanate by additionally adding water scavengers, such as adding diphosphate tetraester in CN110621712A, adding trialkyltin chloride in EP2038746 (A1), adding bistrimethylmethane in US2008257214 (A1) Silyl acetamide or hexamethyldisilazane, etc., but these compounds must be added stoichiometrically, and the decomposition products formed consume NCO groups, affecting downstream applications

Method used

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  • Polyisocyanate composition with stable flocculation and preparation method thereof
  • Polyisocyanate composition with stable flocculation and preparation method thereof
  • Polyisocyanate composition with stable flocculation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Mix 588g HDI and 195g n-octanol (molar ratio 7:3) and heat at 120°C. After 1 hour of reaction, the test alcohol conversion rate is 85%; lower the reaction temperature to 60°C, add 1ml, 20% of 2 - n-butanol solution of hydroxypropyl trimethyl isooctanoic acid ammonium salt (purchased from Evonik Company), when the NCO content in the reaction solution reaches 29.3%, 0.19 g of di-n-butyl phosphate is added to terminate the reaction. Next, using a thin-film evaporator, it was refined twice under the conditions of 150° C. and 0.2 Torr to obtain a polyisocyanate composition with a mass concentration of HDI monomer of 0.16%.

[0071] The prepared polyisocyanate composition had a chromaticity of 16 Hazen, a viscosity of 2230 mPa·s (25°C), an NCO content of 19.4%, a measured A value of 0.25, a measured B value of 0.025, and a calculated C value of 0.1.

Embodiment 2

[0073] Mix 756g HDI and 51g n-hexanol (9:1 molar ratio) and heat at 100°C. After 1 hour of reaction, the test alcohol conversion rate is 82%; the reaction temperature is lowered to 60°C, and 1ml, 20% of 2- Hydroxypropyl trimethyl isooctanoic acid ammonium salt (purchased from Evonik Company) in n-butanol solution, when the NCO content in the reaction solution reached 38.1%, 0.19 g of di-n-butyl phosphate was added to terminate the reaction. Next, using a thin-film evaporator, it was refined twice under the conditions of 150° C. and 0.2 Torr to obtain a polyisocyanate composition with a mass concentration of HDI monomer of 0.15%.

[0074] The prepared polyisocyanate composition had a chromaticity of 17 Hazen, a viscosity of 2511 mPa·s (25° C.), an NCO content of 21.6%, a measured A value of 0.05, a measured B value of 0.005, and a calculated C value of 0.1.

Embodiment 3

[0076] Mix 672g HDI and 102g n-hexanol (molar ratio 8:2) and heat at 100°C. After 2 hours of reaction, the test alcohol conversion rate is 88%; the reaction temperature is lowered to 60°C, and 1ml, 20% of 2- The n-butanol solution of hydroxypropyl trimethyl isooctanoic acid ammonium salt (purchased from Evonik Company), when the NCO content in the reaction solution reaches 36.0%, 0.19 g of di-n-butyl phosphate was added to terminate the reaction. Next, using a thin-film evaporator, it was refined twice under the conditions of 150° C. and 0.2 Torr to obtain a polyisocyanate composition with a mass concentration of HDI monomer of 0.16%.

[0077] The prepared polyisocyanate composition had a chromaticity of 16 Hazen, a viscosity of 2452 mPa·s (25°C), an NCO content of 20.5%, a measured A value of 0.16, a measured B value of 0.008, and a calculated C value of 0.05.

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Abstract

The invention discloses a polyisocyanate composition with stable flocculation and a preparation method thereof; the polyisocyanate composition is prepared by reacting aliphatic (cyclic) diisocyanate and monohydric alcohol or dihydric alcohol, and in the composition, the molar ratio of allophanate to allophanate connected with an isocyanurate ring is (0.001-0.6):1, preferably (0.001-0.4):1, and more preferably (0.001-0.3):1. Compared with the prior art, the polyisocyanate composition with excellent flocculation stability under a moisture condition can be provided under the condition that no additive is added.

Description

technical field [0001] The invention relates to a polyisocyanate composition, in particular to a flocculation-stabilized polyisocyanate composition and a preparation method thereof. Background technique [0002] Isocyanates can be used to prepare polyurethane coatings, especially aliphatic isocyanate products, which have good weather resistance and chemical stability, so they have been widely used for various purposes for a long time. When isocyanate is used, organic solvents are usually added for opening and diluting, and the moisture in the solvent and the moisture in the air introduced during the multiple opening and closing processes are the main reasons for the occurrence of flocs. Most of the prior art is to solve the flocculation problem of isocyanate by additionally adding water scavengers, such as adding diphosphate tetraester in CN110621712A, adding trialkyltin chloride in EP2038746 (A1), adding bistrimethylmethane in US2008257214 (A1) Silylacetamide or hexamethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79
CPCC08G18/792C08G18/798C08G18/794C08G18/79
Inventor 胡浩孙立冬尚永华孙淑常史培猛王少华王暖程周琦
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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