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Water dispersible polyisocyanate composition and preparation method thereof

A technology of polyisocyanate and diisocyanate, which is applied in the field of water-dispersible polyisocyanate composition and its preparation, can solve the problems of short pot life and high production cost, achieve short pot life, improve performance, and reduce the chance of releasing CO2 gas Effect

Active Publication Date: 2019-03-26
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a water-dispersible polyisocyanate composition and a preparation method thereof to solve the defects of short pot life and high production cost of water-dispersible polyisocyanate in the prior art

Method used

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  • Water dispersible polyisocyanate composition and preparation method thereof
  • Water dispersible polyisocyanate composition and preparation method thereof
  • Water dispersible polyisocyanate composition and preparation method thereof

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preparation example Construction

[0031] A preparation method of a water-dispersible polyisocyanate composition, used to prepare the water-dispersible polyisocyanate composition of any one of claims 1-8, which is prepared in this way:

[0032] S1. Synthesis of hydrophilic modified polyisocyanate curing agent: first synthesize fluorine-containing polyether hydrophilic modifier; then heat polyisocyanate to 70-100°C under nitrogen protection; then add fluorine-containing polyether hydrophilic The water modifier is reacted in the presence of the catalyst dibutyltin dilaurate, wherein the mass of the fluorine-containing polyether hydrophilic modifier is 5%-30% of the mass of the polyisocyanate, and the reaction temperature is 80-85 ℃, the reaction time is 2.5-3-4h; then add benzoyl chloride to terminate the reaction, the mass of benzoyl chloride is 0.01-0.1% of the total mass of reactants; stop the reaction to obtain a hydrophilic modified polyisocyanate curing agent.

[0033] In step S1, the synthesis process of t...

Embodiment 1

[0041] Such as Figure 1-4 As shown, diethylamine was used as an initiator and KOH was used as a catalyst to catalyze the ring-opening polymerization of propylene oxide. The synthesis was carried out in a clean and dry 1L stirred autoclave. First place 2.8g of KOH catalyst in the autoclave, and then repeatedly vacuumize and fill the autoclave with nitrogen. Then, 111.0 g (~1.52 eq) of chromatographically pure grade (purity ≥ 99.5%) diethylamine was added into the kettle at room temperature as a starting agent to synthesize monofunctional polyether. At room temperature, 3.6 bar nitrogen was introduced. Then, 40 g of propylene oxide was pressed in, and the temperature of the reactor was gradually raised to 125° C. for induction reaction. When the reaction pressure drops suddenly and the temperature rises more than 5 °C, it indicates that the induced reaction is over. 426 g of propylene oxide were gradually added to the autoclave over the next 3 hours and 30 minutes. The mix...

Embodiment 2

[0057] Such as Figure 5 As shown, using polyether A as a raw material, 85g of dry dichloromethane solvent, 40g of polyether A (as an initiator), 1.1g of tetrabutylammonium bromide, 1.2g of boron trifluoride ether (as a catalyst) Add it to a three-necked flask equipped with a stirrer and a thermometer, and start stirring. Use a refrigerator to lower the temperature of the reaction system to about 0°C. After stirring for 20-30 minutes, start to add 72g of 3-(2-perfluorohexylethoxy)-1,2-propylene oxide dropwise, and maintain the temperature of the reaction system at Around 0°C, the dropwise addition time is about 2 hours. After the dropwise addition, keep the temperature constant and continue the reaction for 3h. Then, 200 g of water was added and stirred for 5 min, thereby destroying the catalyst and terminating the polymerization reaction. The water-insoluble oil phase was removed, and then subjected to vacuum distillation to obtain a fluorine-containing polyether monohydri...

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Abstract

The invention relates to the field of two-component water-based resins and relates to a water dispersible polyisocyanate composition and a preparation method thereof. The composition is prepared according to a mass ratio 10:1 to 1:3 of a hydrophilic modified polyisocyanate curing agent and aromatic polyisocyanates, and the NCO content accounts for 15-25% of the total mass of the water dispersiblepolyisocyanate composition and comprises fluorine-containing polyether chain segments and zwitterionic fragments. The preparation method comprises the following steps: S1, synthesizing a hydrophilic modified polyisocyanate curing agent; and S2, adding aromatic polyisocyanates into the hydrophilic modified polyisocyanate curing agent under nitrogen protection, stirring and mixing for 5-40 minutes,thereby obtaining the water dispersible polyisocyanate composition. The defects in the prior art that the working life of water dispersible polyisocyanate is short and the production cost is high areovercome, and the water dispersible polyisocyanate composition with low cost and high performance is obtained.

Description

technical field [0001] The invention relates to the technical field of two-component water-based resins, more specifically, to a water-dispersible polyisocyanate composition and a preparation method thereof. Background technique [0002] The cost of aromatic polyisocyanate is lower, and the performance of the cured product after being combined with the hydroxyl component is also better. Johnson et al proposed in U.S. Patent No. 3996154 to use the reaction product of polyethylene glycol methyl ether with MDI, TDI, and PAPI as a surfactant, and then mix it with MDI, TDI, and PAPI to prepare a water-based aromatic polyisocyanate. However, the reactivity of aromatic polyisocyanate is very high, and the reaction speed with water is very fast, so that its pot life in water is very short. In U.S. Patent No. 4,663,377, Rudolf et al. reacted a mixture of 60% MDI and 40% PAPI with monofunctional polyoxyethylene alcohol to prepare a water-dispersible polyisocyanate with a short pot li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/78C08G18/79
CPCC08G18/7843C08G18/794
Inventor 纪凤龙
Owner WUYI UNIV
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