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Method for preparing dispersion liquid of aqueous polyurethane of diphenyl methane diisocyanate

A polyurethane dispersion and diisocyanate technology, applied in the field of synthetic dispersions, can solve the problems of high cost, low hardness, and death of polyurethane products, and achieve the effects of avoiding product instability, improving product performance, and reducing raw material costs.

Inactive Publication Date: 2009-08-19
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The organic solvent itself is highly toxic, and it is highly irritating to human respiratory organs, skin, and eyes during the production process, and even causes death
[0004] 2. There will be residual organic solvents in the products prepared by organic solvent-based polyurethane, which will bring serious consequences to humans and the environment during use
[0005] 3 The use of organic solvents results in higher cost of polyurethane products, which limits its wide application in industry and life
However, when the hydroxyl-terminated aqueous polyurethane dispersion is used to prepare adhesives and coatings, it will cause disadvantages such as low bond strength and low hardness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 0.01mol polybutylene adipate (molecular weight 2000) and 0.05mol DMPA are added in the three-neck flask; Add 0.03mol MDI, 0.09mol HDI and 0.9mol solvent acetone under stirring at room temperature; Heat to acetone reflux temperature, react After 2 hours, add 0.042 mol of 1,4-butanediol; continue to react for 2 hours at the reflux temperature of acetone, then cool down to room temperature, add 0.05 mol of triethylamine to neutralize carboxyl groups, stir at room temperature for 30 minutes, then add 10 mol of deionized water dropwise At the same time, 0.018mol piperazine was added dropwise, and after vigorous stirring for 10 minutes, it was heated to the reflux temperature of acetone for 5 minutes. After the reaction is over, the acetone is removed by increasing the temperature and reducing pressure to obtain the product. The obtained aqueous polyurethane has a viscosity of 1500 mPa.s and is a translucent stable emulsion.

Embodiment 2

[0021] Add 0.01mol polyhexamethylene adipate (molecular weight 2000) and 0.02mol DMPA into the three-necked flask; add 0.06mol MDI, 0.06mol H under stirring at room temperature 12 MDI and 1.5mol solvent acetone; heat to acetone reflux temperature, after 4 hours of reaction, add 0.072mol 1,4-butanediol; continue to react at the reflux temperature of acetone for 3 hours, cool down to room temperature, add 0.02mol triethylamine to neutralize Carboxyl group; after stirring at room temperature for 5 minutes, add 13 mol of deionized water dropwise, and simultaneously add piperazine (the number of moles of which is equal to the amount of free NCO) dropwise, stir vigorously for 30 minutes, then heat to acetone reflux temperature for 20 minutes. After the reaction is over, the acetone is removed by increasing the temperature and reducing pressure to obtain the product. The obtained aqueous polyurethane has a viscosity of 80 mPa.s and is a white unstable emulsion.

Embodiment 3

[0023] 0.01mol polytetrahydrofuran ether glycol (molecular weight 2000) and 0.03mol dimethylol propionic acid are added in the three-necked flask; 0.05mol MDI, 0.07molIPDI and 1.28mol acetone are added under stirring at room temperature; heated to acetone reflux temperature, the reaction After 3 hours, add 0.056mol 1,4-butanediol; continue the reaction at the reflux temperature of acetone for 4 hours, then cool down to room temperature, add 0.03mol triethylamine to neutralize the carboxyl group; after stirring at room temperature for 10 minutes, add dropwise 12mol deionized water, and 0.024mol piperazine was added dropwise at the same time, after vigorously stirring for 30 minutes, it was heated to the reflux temperature of acetone for 30 minutes to react. After the reaction is over, the acetone is removed by increasing the temperature and reducing pressure to obtain the product. The obtained aqueous polyurethane has a viscosity of 600 mPa.s and is a translucent stable emulsio...

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Abstract

A method for preparing a diphenylmethane diisocyanate-based aqueous polyurethane dispersion liquid comprises adding polyester diol, polyether diol or polycarbonate diol and dimethylol propionic acid into a reactor, and adding diphenylmethane diisocyanate under stirring at room temperature. Benzylmethane diisocyanate and inert isocyanate are added with acetone and heated to the reflux temperature of acetone to react, then add 1,4-butanediol, continue the reaction at the reflux temperature of acetone, and then reduce to room temperature, add triethylamine to neutralize the dimethylol After stirring at room temperature for 5-30min, deionized water and piperazine are added dropwise, and after vigorously stirring for 10-30min, heated to the acetone reflux temperature for reaction, the temperature is increased and the acetone is removed under reduced pressure to obtain the product; the present invention has adhesive strength The advantages of high and high hardness.

Description

technical field [0001] The invention belongs to a method for synthesizing a dispersion liquid, in particular to preparing an aqueous polyurethane dispersion liquid by reacting diphenylmethane diisocyanate (MDI), inert isocyanate and polyol. technical background [0002] The product prepared by organic solvent-based polyurethane (PU) is a kind of polymer material with excellent performance, which has the properties of abrasion resistance, chemical resistance, low temperature resistance, good flexibility and good adhesion. It is widely used in adhesives, coatings, paper coatings, steel antirust, leather finishing agents, fiber or fabric treatment agents, glass surface treatment agents, etc., among which it is most widely used in the fields of adhesives and coatings. Although organic solvent-based polyurethane has always been dominant, there are still some problems to be solved: [0003] 1. The organic solvent itself is highly toxic, and it is highly irritating to human respir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/48C08G18/42C08G18/08
Inventor 王军威杜辉赵雨花亢茂青王心葵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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