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Water-dispersible polyisocyanate cross-linking agent and preparation method thereof

A polyisocyanate and crosslinking agent technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of long drying time, high polyether content and high price

Inactive Publication Date: 2011-11-16
李莲 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are similar products currently on the market, which are expensive and have obvious disadvantages when they are used as cross-linking agents for water-based coatings, that is, they need a higher polyether content to ensure sufficient dispersibility in water, which leads to The paint needs a longer drying time and makes the paint have a long-lasting hydrophilicity

Method used

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  • Water-dispersible polyisocyanate cross-linking agent and preparation method thereof
  • Water-dispersible polyisocyanate cross-linking agent and preparation method thereof
  • Water-dispersible polyisocyanate cross-linking agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0046]

[0047] In a 250 ml three-necked round-bottomed flask equipped with a thermometer and a stirrer, 100 grams of compound VI (PEG-200, with an average molecular weight of 190-210) and 75 grams of triethylamine were added under nitrogen protection; Add 76 g of O, O-dimethoxyphosphoryl chloride, and stir the reaction at room temperature after the dropwise addition. Samples were taken during the reaction and monitored by LC-MS until compound VI disappeared, washed with a small amount of water and dried in a vacuum oven to obtain compound VII. The compound was characterized by proton nuclear magnetic resonance, and a characteristic triplet peak at about 4.2ppm was seen.

Embodiment 2

[0049] Add 100 grams of compound VI (PEG-200, with an average molecular weight of 190-210) and 75 grams of triethylamine in a 500 ml three-necked round-bottomed flask equipped with a thermometer, a stirrer and a reflux condenser; slowly dropwise add O,O-dimethoxyphosphoryl chloride (solution of 76 g in 50 ml of toluene). During the reaction, samples were taken and LC-MS was used to monitor the reaction until compound VI disappeared. The above reaction liquid was distilled off the solvent under reduced pressure, washed with water and dried in a vacuum oven to obtain compound VII.

Embodiment 3

[0051] Add 1 kg of compound VI (PEG-200, with an average molecular weight of 190-210) and 0.75 kg of triethylamine into a 10-liter reactor equipped with a thermometer, a stirrer and a reflux condenser. The above mixture was cooled to 0°C, and 0.76 kg of O,O-dimethoxyphosphoryl chloride was slowly added dropwise, and the temperature was controlled below 10°C during the dropwise addition; after the drop was completed, the temperature was raised to room temperature for reaction. Samples were taken during the reaction and the reaction was monitored by LC-MS until compound VI disappeared. Compound VII was obtained by separating by beating with water and drying in a vacuum oven.

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Abstract

The invention relates to a water-dispersible polyisocyanate cross-linking agent and its preparation method and application in water-borne coatings, and belongs to the technical field of chemical synthesis. A molecular structure formula of the polyisocyanate cross-linking agent is shown in the formula (I), wherein R1-R5 represent various groups of C1-C20 and n represents an integer. The polyisocyanate cross-linking agent is prepared from an aliphatic diisocyanate tripolymer and a hydroxyl-terminated polyether segment. The polyisocyanate cross-linking agent can be utilized for cross-linking agents or additives of water-borne coatings, and has the advantages of good water dispersible characteristic, good compatibility and good room-temperature curing characteristic.

Description

technical field [0001] The invention relates to a water-dispersible polyisocyanate crosslinking agent, a preparation method thereof and an application in water-based paint, which belong to the technical field of chemical synthesis. Background technique [0002] Traditional solvent-based coatings contain a large amount of volatile organic compounds, which have caused great pollution to the environment and consumed a large amount of non-renewable petroleum energy during production and use. In recent years, countries around the world have increasingly strengthened the corresponding legislation on environmental protection and reducing energy consumption. For example, the member states of the European Union have made very strict legislation on the emission of volatile organic compounds. Due to its low content of volatile organic compounds, water-based coatings are increasingly becoming the focus of research and promotion in various countries. At present, the market share of wate...

Claims

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Application Information

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IPC IPC(8): C08G18/77C09D175/04C09D7/12
Inventor 李莲许建烟
Owner 李莲