Method for preparing polyisocyanate through photochemical reaction, and method for preparing waterborne polyurethane resin

A polyisocyanate and reaction technology, applied in the field of water-based polyurethane resin, can solve the problems of yellowish color and high chlorine content of polyisocyanate

Active Publication Date: 2019-11-29
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above prior art prepares polyisocyanate, although many methods for reducing the chromaticity and chlorine content of isocyanate are mentioned, but it is not clear which type of impurity causes the chlorine content of polyisocyanate to be high or the color is yellow, which affects the reality. There is some uncertainty in the application process

Method used

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  • Method for preparing polyisocyanate through photochemical reaction, and method for preparing waterborne polyurethane resin
  • Method for preparing polyisocyanate through photochemical reaction, and method for preparing waterborne polyurethane resin

Examples

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Effect test

preparation example 1

[0098] a) Using the heater disclosed in Example 1 of Chinese patent application CN105214568A, diamine H 12 MDA is gasified and heated to 355°C. Under the protection of nitrogen, gaseous phosgene heated to 355°C is continuously added to the reactor through the respective feed tubes for phosgenation reaction; the reaction pressure is absolute pressure 0.05MPa, the reaction temperature is 360℃; where, H 12 The feed rate of MDA is 800Kg / h, and the feed rate of gaseous phosgene is 3000Kg / h; Adopt o-dichlorobenzene solution to pass through the gas jet absorption device that the mixed gas gained after the reaction is cooled rapidly (contact time is about 10s) to 100°C, the product containing H 12 The crude product of MDI, phosgene and o-dichlorobenzene solution; the reaction tail gas enters the tail gas absorption tower and is absorbed by -35°C o-dichlorobenzene solution to obtain the o-dichlorobenzene solution containing phosgene.

[0099] b) The crude product obtained in step a) ...

preparation example 2

[0107] The phosgenation reaction of step a) adopts liquid phase phosgenation reaction, and adopts the following steps in the reaction kettle disclosed with reference to Chinese patent document CN103319372B:

[0108] 1) cold reaction: the H 12 MDA uses o-dichlorobenzene as a solvent to configure a solution with a mass content of 15%, and preheats it to 40°C, and simultaneously passes liquid phosgene at -5°C into a reaction kettle containing o-dichlorobenzene solution for liquid phase Phosgenation reaction; where, H 12 The feeding amount of MDA is 400Kg / h, the feeding amount of cold reaction phosgene is 1500kg / h, the cold reaction temperature is controlled at 60°C, and the residence time is 5min;

[0109] 2) Thermal reaction: the temperature is controlled at 155°C, and the residence time is 2h. The reaction is carried out in the presence of o-dichlorobenzene solution and excess phosgene, and the product containing H 12 The reaction solution (crude product) of MDI, phosgene and...

preparation example 3

[0118] The phosgenation reaction of step a) adopts the salt-forming phosgenation reaction, and adopts the following steps in the tank reactor disclosed in the embodiment 1 of the Chinese patent document CN105218422B with reference to:

[0119] 1) Add 1000Kg o-dichlorobenzene in advance as the reaction solvent in the salt-forming reactor, turn on the circulation pump and stir, and the hydrogen chloride compressed gas enters the reactor at a speed of 50mol / min through the pre-mixer, and after stirring for 15min, the H 12 The mixed solution of MDA and o-dichlorobenzene is heated to 30°C through the raw material preheater, and then it is fully contacted with hydrogen chloride gas at a flow rate of 335Kg / h to form a salt reaction; it is cooled by external circulating cooling water to remove part of the heat of reaction and circulate Liquid flow at 5m 3 / h or so, the temperature of the reaction solution is maintained at 30-45°C, and after feeding for 3 hours, stop the H 12 The mixe...

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Abstract

The invention especially relates to a method for preparing polyisocyanate through a photochemical reaction, and a method for preparing waterborne polyurethane resin, belonging to technical field of waterborne polyurethane resin. The method for preparing the waterborne polyurethane resin comprises a step of carrying out a polymerization reaction on raw materials containing polyisocyanate, oligomerpolyol, a chain extender and a hydrophilic agent to obtain the waterborne polyurethane resin, wherein the content of benzophenone impurities in the polyisocyanate is less than or equal to 0.045 wt%. By controlling the content of benzophenone impurities in the preparation process of polyisocyanate, the yellowing resistance of the waterborne polyurethane resin can be effectively improved, and harm to the qualified rate of downstream products caused by existence of the impurities in the waterborne polyurethane resin is also reduced.

Description

technical field [0001] The invention belongs to the technical field of water-based polyurethane resins, and in particular relates to a method for preparing polyisocyanate by photochemical reaction and a method for preparing water-based polyurethane resins. Background technique [0002] Polyurethane is one of the synthetic resins with excellent comprehensive properties. Due to its variety of synthetic monomers, mild, specific and controllable reaction conditions, large room for formula adjustment and the microstructure characteristics of polymer materials, it can be widely used in coatings, adhesives, foam plastics, synthetic fibers and elastomers. , has become one of the essential materials for people's clothing, food, housing, and transportation; moreover, it has formed a multi-variety and multi-series material family, forming a complete polyurethane industrial system, which is what other resins have. Not available. [0003] With the strengthening of people's awareness of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/10C07C265/14C08G18/75
CPCC07C263/10C08G18/758C07C2601/14C07C265/14
Inventor 俞勇尚永华李建峰郭耀允王腾飞李文滨孙烨王峤刘德刚黎源
Owner WANHUA CHEM GRP CO LTD
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