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Aqueous polyurethane and preparation thereof

A technology of water-based polyurethane and polyurethane prepolymer, which is applied in the field of fine chemicals and its preparation, can solve problems such as unsatisfactory, polluted environment and overall performance, and achieve the effects of increasing cross-linking density, solving pollution and damage, and improving performance

Inactive Publication Date: 2009-05-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of waterborne polyurethane and preparation method thereof, to overcome the polluted environment and the unsatisfactory problems of overall performance existing in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, a kind of waterborne polyurethane is prepared by the following method, and described method comprises the following steps successively

[0027] 1. Preparation of polyurethane prepolymer: Add 30.77Kg of polytetrahydrofuran diol with a relative molecular weight of 1000 into the drying reactor, and heat the reactor to 80-90°C, and then add 43.58Kg of isophorone Diisocyanate and 0.45Kg of catalyst dibutyltin dilaurate are added to the reactor and polymerized at 80-90°C for 2.5 hours to form a polyurethane prepolymer;

[0028] 2. Chain extension reaction: Add 6.27Kg of hydrophilic chain extender dimethylolpropionic acid and 1.35Kg of crosslinking agent trimethylolpropane to the polyurethane prepolymer for chain extension reaction. The reaction temperature is 70°C. The reaction time is 2.0 hours;

[0029] 3. Capping reaction: Add 8.25Kg organofunctional silane to the reactor for capping reaction, the reaction temperature is 30°C, and the time is 1.0 hour;

[0...

Embodiment 2

[0031] Embodiment 2, a kind of waterborne polyurethane is prepared by the following method, and described method comprises the following steps successively:

[0032] 1. Preparation of polyurethane prepolymer: Add 35.15Kg of polytetrahydrofuran diol with a relative molecular weight of 1000 into the drying reactor, and heat the reactor to 80-90°C, and then add 41.13Kg of isophthalic acid according to the mass ratio Fluorone diisocyanate and 0.40Kg of catalyst are added to the reactor for polymerization at 80-90°C for 2.5 hours to form a polyurethane prepolymer;

[0033] 2. Chain extension reaction: Add 7.50Kg of hydrophilic chain extender dimethylol butyric acid and 2.50Kg of crosslinking agent trimethylolpropane to the polyurethane prepolymer for chain extension reaction. The reaction temperature is 70°C. The reaction time is 1.5 hours;

[0034] 3. Capping reaction: Add 7.25Kg organofunctional silane into the reactor for capping reaction, the reaction temperature is 30°C, and ...

Embodiment 3

[0036] Embodiment 3, a kind of waterborne polyurethane is prepared by the following method, and described method comprises the following steps successively:

[0037] 1. Preparation of polyurethane prepolymer: Add 35.64Kg of polytetrahydrofuran diol with a relative molecular weight of 2000 into the drying reactor, and heat the reactor to 80-90°C, and then add 42.6Kg of isofor according to the mass ratio Alone diisocyanate, hexamethylene diisocyanate (the molar ratio of isophorone diisocyanate and hexamethylene diisocyanate is 1 / 1) and 0.45Kg of catalyst are added to the reactor at 80-90°C for polymerization React for 2.0 hours to form a polyurethane prepolymer;

[0038] 2. Chain extension reaction: Add 6.57Kg of hydrophilic chain extender dimethylolpropionic acid and 2.50Kg of crosslinking agent trimethylolpropane to the polyurethane prepolymer for chain extension reaction. The reaction temperature is 65°C. The reaction time is 1.5 hours;

[0039] 3. Capping reaction: Add 9.2...

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Abstract

The invention belongs to the technical field of fine chemicals and preparation thereof, and in particular relates to waterborne polyurethane and a preparation method thereof. In order to solve the problems of environmental pollution and non-ideal overall performance of the prior art, the invention adopts a technical proposal that the waterborne polyurethane is prepared by the method sequentially comprising the following: (1) a step of preparing polyurethane prepolymer, which is to take polyglycol and diisocyanate as raw materials for polymerization reaction and form the polyurethane prepolymer; (2) a step of performing chain extension reaction, which is to add hydrophilic chain extender and trimethylolpropane as a crosslinking agent to the polyurethane prepolymer so as to perform chain extension reaction; (3) a step of performing end capping reaction, which is to add organic functional silane to a reactor so as to perform end capping reaction; and (4) a step of emulsifying, which is to add organic base, regulate the pH value between 7.0 and 7.5, add deionized water in a state of stirring and obtain a white emulsion. Compared with the prior art, the preparation method has the advantages of eliminating pollution, and improving the overall performance of the product.

Description

Technical field: [0001] The invention belongs to the technical field of fine chemicals and their preparation, in particular to a water-based polyurethane and a preparation method thereof. Background technique: [0002] Polyurethane is widely used in the coating industry, leather, textile printing and dyeing industry and other fields. It includes solvent-based polyurethane and water-based polyurethane. Among them, water-based polyurethane uses water as the medium and has the advantages of non-toxic, cheap, safe, and non-combustible. , so water-based polyurethane tends to replace solvent-based polyurethane. But water-based polyurethane also has the following problems: 1. Pollution of the environment: water-based polyurethane still needs high-speed shearing and adding a large amount of organic solvents to disperse in water during its preparation process, which will adversely affect the staff, environment and application effect; 2. The overall performance is not ideal: the curr...

Claims

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Application Information

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IPC IPC(8): C08G18/83C08G77/458
Inventor 沈一丁赖小娟王磊
Owner SHAANXI UNIV OF SCI & TECH
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