Simplified preparation method of polyurethane hydrogel

A hydrogel and polyurethane technology, which is applied in the field of polyurethane hydrogel preparation, can solve the problems of cumbersome preparation process and long time consumption, and achieve the effects of simple preparation process, shortened reaction time, and excellent physical and mechanical properties

Inactive Publication Date: 2015-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the tedious and time-consuming problems of the above technical preparation process, the present invention provides a method for preparing polyurethane hydrogel that is short in time, and the reactions are all carried out at room temperature.

Method used

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  • Simplified preparation method of polyurethane hydrogel
  • Simplified preparation method of polyurethane hydrogel
  • Simplified preparation method of polyurethane hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Synthesis of polyurethane prepolymer: In terms of mass fraction, first add 60 parts of polytetrahydrofuran diol into a 250mL three-necked flask, heat up to 125°C; add 2 parts of 1,4-butanediol chain extender, Keep the vacuum at 0.08MPa. After dehydration for 3 hours, place it to lower the temperature to 25°C; add the dehydrated polytetrahydrofuran diol to 10 parts of isophorone diisocyanate in two times, and the time interval between two additions is 40 minutes; after the addition, control the temperature and react at 100°C for 2 hours, and use the di-n-butylamine titration method to measure the mass content of -N=C=O in the prepolymer; when the actual measured value is close to the theoretical value, vacuum defoaming , sealed and kept for later use. After testing, the mass content of isocyanate groups is 0.2510g / 100g, and the molar concentration is 0.0060mol / 100g.

[0034] (2) Preparation of polyurethane hydrogel: In terms of mass fraction, add 1 part of polyureth...

Embodiment 2

[0040] (1) Synthesis of polyurethane prepolymer: In terms of mass fraction, first add 40 parts of polycastor oil adipate polyol into a 250mL three-necked flask, heat up to 125°C; add 2.5 parts of glycerol chain extender , the vacuum degree is kept at 0.06MPa, after dehydration for 2.5 hours, place it to lower the temperature to 25°C; add the dehydrated polyethylene glycol to 30 parts of HDI trimer in 8 times, and the time interval between 8 times of addition is 10 minutes ; After the addition, control the temperature and react at 80°C for 3 hours, and use the di-n-butylamine titration method to measure the mass content of -N=C=O in the prepolymer; when the actual measured value is close to the theoretical value, vacuum defoaming and sealing Save for later. The mass content of isocyanate group is 0.9896g / 100g, and the molar concentration is 0.0236mol / 100g;

[0041] (2) Preparation of polyurethane hydrogel: In terms of mass fraction, add 5 parts of polyurethane prepolymer to 50...

Embodiment 3

[0043] (1) Synthesis of polyurethane prepolymer: In terms of mass fraction, first add 50 parts of polyethylene adipate diol into a 250mL three-necked flask, stir evenly, heat up to 100°C; add 2 parts of trihydroxy Methyl propane chain extender, the vacuum degree is kept at 0.04MPa, after dehydration for 2.5 hours, place it to lower the temperature to 60°C; add the dehydrated polyethylene adipate glycol in 3 times to 20 parts of In 1,6‐hexamethylene diisocyanate, the time interval between 3 additions is 20 minutes; after the addition, the temperature is controlled at 80°C for 3 hours, and the -N=C= The mass content of O; when the actual measured value is close to the theoretical value, vacuum defoaming, sealed and preserved for future use. The mass content of isocyanate groups is 3.4860g / 100g, and the molar concentration is 0.0830mol / 100g.

[0044] (2) Preparation of polyurethane hydrogel: In terms of mass fraction, 10 parts of polyurethane prepolymers are added to 80 parts of...

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Abstract

The invention discloses a simplified preparation method of polyurethane hydrogel. The method comprises the following steps: heating and warming 40-60 parts of hydrophilic polyester polyol or hydrophilic polyether polyol to 90-125 DEG C, adding 2-3 parts of a chain extender to the hydrophilic polyester polyol or the hydrophilic polyether polyol, dehydrating the mixture of the chain extender and the hydrophilic polyester polyol or the mixture of the chain extender and the hydrophilic polyether polyol, and cooling the dehydrated mixture of the chain extender and the hydrophilic polyester polyol or the mixture of the chain extender and the hydrophilic polyether polyol to 25-60 DEG C; adding the dehydrated hydrophilic polyester polyol or hydrophilic polyether polyol to 10-30 parts of polyisocyanate, carrying out reaction at the temperature of 75-100 DEG C for 2-4 hours, and carrying out vacuum defoaming in a vacuum manner so as to obtain polyurethane prepolymer; then directly dissolving the polyurethane prepolymer in a fitting organic solvent so as to form organogel, and finally replacing the organic solvent with deionized water so as to obtain the polyurethane hydrogel. According to the method disclosed by the invention, the step that polyurethane elastomers must be synthetized firstly in the traditional preparation process of the polyurethane hydrogel is simplified, time for preparing the polyurethane hydrogel is greatly shortened, the transparency of the obtained polyurethane hydrogel is good, and the mechanical strength is high.

Description

technical field [0001] The invention relates to the field of polyurethane hydrogel, in particular to a simplified preparation method of polyurethane hydrogel. Background technique [0002] The polyurethane (PU) structure contains a large number of repeating urethane chain segments, and its macromolecular main chain is composed of soft segments composed of oligomer polyols and hard segments composed of polyisocyanates and small molecule chain extenders. of. The physical and mechanical properties and other properties of polyurethane can be effectively adjusted and controlled by selecting the appropriate structure and ratio of soft segment and hard segment. In the macromolecular chain of polyurethane, due to the strong polarity of the hard segment and the strong mutual attraction, the hard segment and the soft segment have a thermodynamic tendency to spontaneously undergo phase separation. Therefore, the polyurethane hard segment is easy to gather together and distribute in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/09C08L75/08C08L75/06C08G18/66C08G18/48C08G18/42C08G18/12
Inventor 李光吉王立莹林殷雷张子勋
Owner SOUTH CHINA UNIV OF TECH
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