Polyisocyanate composition and preparation method thereof

A technology of polyisocyanate and isocyanate, which is applied in the field of polyisocyanate, can solve problems such as differences in application performance and achieve excellent moisture stability

Active Publication Date: 2020-02-07
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN104024219A describes the disadvantages of these compounds, because the pronounced crystallization tendency of the toluenesulfonamide formed by reaction with water leads to the blocking of the paint
The difference from the addition of active substances that react with water as described above is that it changes the composition of polyisocyanate, which will cause differences in its application performance

Method used

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  • Polyisocyanate composition and preparation method thereof
  • Polyisocyanate composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] HDI1000g was heated at 70°C, and 20% by weight of formate of 2-hydroxy-N,N,N-trimethyl-1-propanamine (purchased by Shanghai Qihe Chemical Co., Ltd., CAS No. 62314-25-4) was added. 0.5 g (0.62 mmol) of n-butanol solution, and when the NCO content in the reaction solution reached 39.3% by mass, 0.16 g (0.76 mmol) of di-n-butyl phosphate was added to terminate the reaction. Next, using a thin-film evaporator, it refined twice under the conditions of 130 degreeC and 0.2 Torr, and obtained the polyisocyanate composition whose HDI monomer mass density|concentration was 0.16 mass %. The polyisocyanate composition was heat-treated at 80° C. for 120 minutes to obtain a polyisocyanate composition.

[0064] The chromaticity of the polyisocyanate composition prepared by testing was 27 Hazen, the viscosity was 2930mPa·s (25°C), the NCO content was 21.9% by mass, and the 2-hydroxy-N,N,N-trimethyl-1-propylammonium ion ( The content of compound B) is 0.1 mmol, and the content of polyi...

Embodiment 2

[0066] HDI1000g was heated at 60°C, and 1 g of a 20% by mass n-butanol solution of (3-chloro-2-hydroxypropyl)trimethylammonium chloride (purchased from sigma-aldrich platform, CAS No. 3327-22-8) was added (1.06 mmol), and when the NCO content in the reaction liquid reached 38.9% by mass, 0.41 g (1.27 mmol) of diisooctyl phosphate was added to terminate the reaction. Next, using a thin-film evaporator, it refined twice under the conditions of 130 degreeC and 0.2 Torr, and obtained the polyisocyanate composition whose HDI monomer mass density|concentration was 0.16 mass %. The polyisocyanate composition was heat-treated at 170° C. for 30 minutes to obtain a polyisocyanate composition.

[0067] Various physical properties of the obtained polyisocyanate composition were measured, and the chromaticity was 25 Hazen, the viscosity was 3000 mPa·s (25°C), the NCO content was 21.8% by mass, the HDI monomer mass concentration was 0.14% by mass, (3-chloro -2-hydroxypropyl) trimethylammon...

Embodiment 3

[0069] HDI 1000g was heated at 70°C, and 20 mass% n-butanol solution 2.0g (1.17 mmol), and when the NCO content in the reaction liquid reached 25.4% by mass, 0.179 g (1.4 mmol) of dimethyl sulfate was added to terminate the reaction. Next, using a thin film evaporator, it was refined twice under the conditions of 130° C. and 0.2 Torr to obtain a polyisocyanate composition having a HDI monomer mass concentration of 0.15% by mass. The polyisocyanate composition was heat-treated at 130° C. for 40 minutes to obtain a polyisocyanate composition.

[0070] Various physical properties of the obtained polyisocyanate composition were measured, and the chromaticity was 23 Hazen, the viscosity was 2910 mPa·s (25°C), the NCO content was 22.0% by mass, the mass concentration of HDI monomer was 0.14% by mass, 2-hydroxyethyl The content of base-triphenylphosphonium ion (compound B) is 0.05mmol, and the content of polyisocyanurate derivative (compound A) of 2-hydroxyethyl-triphenylphosphonium...

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Abstract

The invention provides a polyisocyanate composition and a preparation method thereof. The polyisocyanate composition contains a compound A shown in a formula I and a compound B shown in a formula II below. The molar ratio of the compound A to the compound B is (5 to 100):1, preferably (10 to 80):1, and more preferably (20 to 50):1. A preparation method of the polyisocyanate composition includes the steps that after a diisocyanate monomer is subjected to a polymerization reaction under the action of a quaternary ammonium salt and/or phosphonium salt catalyst, two-stage film evaporating is conducted to obtain a polyisocyanate; and then the polyisocyanate is subjected to one-step heat treatment to obtain the polyisocyanate composition. The polyisocyanate composition also capable of having excellent moisture stability under the situation of not additionally adding any additive or changing components of the composition can be provided.

Description

technical field [0001] The invention relates to a polyisocyanate, in particular to a polyisocyanate composition and a preparation method. 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 using polyisocyanate mixed with the main ingredient, if the necessary addition amount is a small amount, opening and closing the same raw material tank and taking the material multiple times will cause the problem that the isocyanate group will react with the moisture in the air. [0003] p-toluenesulfonyl isocyanate (H 3 C(C 6 h 4 ) SO 2 -NCO) and triethyl orthoformate (HC(OC 2 h 5 ) 3 ) are examples of water scavengers used in the literature to stabilize polyisocyanates. Among other things, said stabilization includes preventing flocculation of aliphatic polyisocyanates us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/38C08G18/34C08G18/32C08G18/09C09D175/04
CPCC08G18/792C08G18/3821C08G18/3802C08G18/3271C08G18/3857C08G18/3878C08G18/092C09D175/04
Inventor 胡浩孙立冬孙淑常尚永华史培猛周琦石滨
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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