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A kind of hydrophilic diisocyanate and its preparation method and application

A diisocyanate and hydrophilic technology, applied in the field of polyurethane, can solve the problems of poor fat solubility, high price, and inability to extend the chain of isocyanate, and achieve the effects of stable performance, simple method and cost reduction.

Active Publication Date: 2021-04-09
FOSHAN JINGXIN HUIMING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on sulfonate-based hydrophilic agents in the prior art is not mature enough. The main reason is that alkyl sulfonate only has the function of external emulsification, and monohydroxy sulfonate cannot extend the chain of isocyanate, so the modification effect is relatively good. The best ones are small molecule dihydroxysulfamic acid salts and bishydroxysulfonic acid salts, but these two are not only expensive, which greatly increases the cost of oil-to-water modification, but also have poor fat solubility, requiring the addition of more high-boiling polar solvents. Lead to high organic solvent residues in the product, which is difficult to promote
Prior art CN107082860A discloses a molecular weight of 350-1000 small molecular diol containing sulfonic acid groups, which reacts with diisocyanate to prepare water-based polyurethane curing agent, and introduces dicarboxysulfonate and dihydroxysulfonate A method for preparing small molecule diols containing sulfonic acid groups, but the conversion conditions are relatively harsh in practical applications, and it is difficult for general enterprises to master this technology
Due to the convenient source of dicarboxysulfonate raw materials, cheap price, non-toxic and tasteless, if it can be used as a promotional raw material for polyurethane oil to water, it will greatly accelerate the pace of polyurethane water-based

Method used

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  • A kind of hydrophilic diisocyanate and its preparation method and application
  • A kind of hydrophilic diisocyanate and its preparation method and application
  • A kind of hydrophilic diisocyanate and its preparation method and application

Examples

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preparation example Construction

[0061] A kind of preparation method of hydrophilic diisocyanate, comprises the following steps:

[0062] In the reaction kettle, add diisocyanate and co-solvent, turn on the agitator, raise the temperature to 30°C-80°C, add the hydrophilic chain extender in several times, each time after adding the hydrophilic chain extender, it should be at 50°C-60°C React for 0.5-3 hours until the last addition of the hydrophilic chain extender, react at 50°C-60°C for 0.5-3 hours, then raise the temperature to 60°C-80°C and react for 6-20 hours, cool down and discharge to obtain hydrophilic permanent diisocyanate.

[0063] The above-mentioned hydrophilic chain extender is divided into 3-10 parts, and then added in several times. After each part of the hydrophilic chain extender is added, it must be reacted at 50-60°C until the liquid in the kettle is transparent.

[0064] The molar ratio of the reaction materials is diisocyanate:hydrophilic chain extender (3-4):1.

[0065] The above-mentio...

Embodiment 1

[0092] A kind of preparation method of hydrophilic diisocyanate, comprises the following steps:

[0093] a) Preparation of hydrophilic chain extender (small molecule sulfonate diol)

[0094] In the reaction flask equipped with a fractionation device, add 150g of diethylene glycol, 780g of 1,4-butanediol, 260g of deionized water, 2.4g of triphenyl phosphite, turn on the stirrer, raise the temperature to 95°C, and add 400g of m-benzene Diformic acid-5-sodium sulfonate, dissolved at 90-95°C for 2 hours; add 360g of adipic acid, stir at 90-95°C until completely dissolved, then pass nitrogen gas to start esterification reaction, raise the temperature in the kettle, Control the temperature of the water outlet at the top of the condenser tube to 90-99°C. With the progress of the esterification reaction, the temperature in the kettle is controlled at 160-190°C. When the water output reaches the theoretical value, continue to output water for 1 hour; turn on the vacuum pump to graduall...

Embodiment 2

[0098] Preparation of hydrophilic diisocyanate (hydrophilic MDI) comprises the following steps:

[0099] In the reaction bottle, add 200g (1.6 equivalent) of MDI and 67g of acetone, turn on the agitator, raise the temperature to 30°C, take 67.2g (0.32 equivalent) of the hydrophilic chain extender prepared in step a) of Example 1 and add it in four times , react for 0.5 hours after each addition, until all the addition is completed. After 1 hour of reaction, raise the temperature to 50°C for 2 hours, and then rise to 60°C. After 5 hours of reaction, take samples every 0.5 hours to measure the NCO content. When it is stable, the temperature is lowered and discharged to obtain MDI containing sulfonate groups with a solid content of 80%.

[0100] The viscosity of the hydrophilic MDI is 5600mPa.s / 25°C, the NCO% is 16.0%, and the storage period is 6 months.

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Abstract

The invention belongs to the field of polyurethane, and the invention provides a hydrophilic diisocyanate, which comprises at least one structural unit containing the following general formula: In the formula: SO 3 M is a sulfonate group, M is a K ion or a Na ion or an ammonium ion; n is 1-6; the hydrophilic diisocyanate is formed by reacting at least one hydrophilic chain extender with a diisocyanate. The sulfonate group in the hydrophilic diisocyanate structure of the present invention is a salt of strong acid and strong alkali, which has good hydrophilicity, and the isocyanate group at both ends retains the performance of the original diisocyanate, so it has the chemical reaction of diisocyanate characteristics; and using the hydrophilic diisocyanate of the present invention to prepare water-based polyurethane has changed the existing process and greatly simplifies the operation.

Description

technical field [0001] The invention belongs to the field of polyurethane, and in particular relates to a hydrophilic diisocyanate and its preparation method and application. Background technique [0002] Environmental regulations restrict the emission of volatile organic compounds (VOCs) in chemical products, which has promoted the development and application of water-based polyurethane products, but there are still some bottleneck technical problems to be solved, such as: the hydrophilicity required for water-based polyurethane There are too few kinds of raw materials, the price of sulfamate-based hydrophilic raw materials is expensive, the dimethylolcarboxylic acid-based hydrophilic raw materials need to be dissolved in special solvents to react with isocyanate, and the processing technology is complicated. The transformation of enterprise polyurethane products from solvent-based to water-based (oil to water). [0003] The water-based polyurethane is to introduce hydroph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/12C07C309/15C07C303/32C08G18/77C08J3/03C09D175/04C09J175/04D06M15/564C09D11/106C08L75/04
CPCC07C309/12C07C309/15C08G18/775C08J3/03C08J2375/04C09D11/106C09D175/04C09J175/04C07C2601/14D06M15/564
Inventor 刘晓鸿周国豪梁杰宏何绍群周建明
Owner FOSHAN JINGXIN HUIMING TECH CO LTD
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