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Fluorine-containing polyether hydrophilic modifier, preparation method and water-dispersible polyisocyanates curing agent

A technology of hydrophilic modifier and polyisocyanate, which is applied in the field of water-dispersible polyisocyanate curing agent, can solve the problems of short pot life and achieve the effects of prolonging pot life and reducing the chance of contacting and reacting with water

Active Publication Date: 2019-04-05
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 fluorine-containing polyether hydrophilic modifier and a preparation method and a water-dispersible polyisocyanate curing agent to solve the short pot life of the water-dispersible polyisocyanate curing agent in the prior art

Method used

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  • Fluorine-containing polyether hydrophilic modifier, preparation method and water-dispersible polyisocyanates curing agent
  • Fluorine-containing polyether hydrophilic modifier, preparation method and water-dispersible polyisocyanates curing agent
  • Fluorine-containing polyether hydrophilic modifier, preparation method and water-dispersible polyisocyanates curing agent

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preparation example Construction

[0039] A preparation method of a fluorine-containing polyether hydrophilic modifier, which is used to make the fluorine-containing polyether hydrophilic modifier according to claim 1, and its specific steps include:

[0040]S1. Synthesis of tertiary amino polyether monoalcohol: use propylene oxide as a monomer and dialkylamine as an initiator, and synthesize a tertiary amino polyether with a hydroxyl group at one end and a tertiary amino group at the other end by anionic ring-opening polymerization Monohydric alcohol; wherein, propylene oxide is a monomer and the molar ratio of dialkylamine is 2:1~30:1, preferably 2:1~20:1, more preferably 5:1~10:1; step S1 The specific process is: S11, using dialkylamine as the initiator and metered propylene oxide in the autoclave for ring-opening polymerization reaction; when the autoclave is aged to normal pressure, reduce the temperature to obtain tertiary amino polyether Monohydric alcohol crude product. Wherein, the high-pressure react...

Embodiment 1

[0047] 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

[0063] 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 double-component waterborne resin, and relates to a fluorine-containing polyether hydrophilic modifier, a preparation method and a water-dispersible polyisocyanates curing agent. The structural formula of the fluorine-containing polyether hydrophilic modifier is as shown in specification. The preparation method of the fluorine-containing polyether hydrophilicmodifier comprises the following steps: synthesizing tertiary amino polyether monool, then synthesizing amphoteric polyether monool, and finally synthesizing amphoteric polyether monool with a zwitterionic group. Preparation of the water-dispersible polyisocyanates curing agent comprises the steps of reacting polyisocyanates and the fluorine-containing polyether hydrophilic modifier with the zwitterionic group in the presence of a catalyst for 2.5-3 h, then adding benzoyl chloride, and then stopping reaction. The shortcoming that the water-dispersible polyisocyanates curing agent in the priorart is short in pot life is overcome, and therefore, a purpose of prolonging the pot life of the water-dispersible polyisocyanates curing agent is achieved.

Description

technical field [0001] The invention relates to the technical field of two-component water-based resins, and more specifically relates to a fluorine-containing polyether hydrophilic modifier, a preparation method and a water-dispersible polyisocyanate curing agent. Background technique [0002] Polyurethane has excellent abrasion resistance, flexibility, elasticity, mechanical properties and chemical resistance, as well as bright and strong adhesion, so it is widely used in the field of coatings and adhesives. With the strengthening of people's awareness of environmental protection, the restrictions on the emission of volatile organic compounds (VOC) in various countries' environmental protection laws and regulations have gradually increased, and the research and development of waterborne polyurethane have been paid more and more attention. However, the one-component waterborne polyurethane coatings commonly used in the market have poor chemical resistance and solvent resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/334C08G65/26C08G18/78
CPCC08G18/78C08G65/2624C08G65/3346
Inventor 纪凤龙
Owner WUYI UNIV
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