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A kind of preparation method of zwitterionic polyurethane hydrogel

A zwitterion, hydrogel technology, applied in the field of polyurethane hydrogel preparation, can solve problems such as defects in intelligent response characteristics, singleness, etc., and achieve the effect of improving mechanical properties and expanding the scope of application

Active Publication Date: 2018-04-03
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although temperature and pH dual-sensitive smart hydrogels have developed rapidly, most of them contain only one pH-sensitive functional group and can only produce smart responses to a single pH value.
When the pH value of the external environment changes continuously, the intelligent response properties exhibited by this type of hydrogel still have some defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 60 kilograms of polyethylene glycol (the number-average relative molecular mass is 6000), 4.6 kilograms of isophorone diisocyanate, 90 kilograms of dimethylformamide, 16.0 × 10 dibutyltin dilaurate -3 kg, was added to a 500L reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and reacted at a temperature of 80°C for 3 hours. Then add 1.4 kg of 2,2-dimethylolpropionic acid, 2.3 kg of isophorone diisocyanate, and 30 kg of dimethylformamide, control the temperature at 80°C, and react for 3 hours to obtain prepolymer I, which is set aside. 60 kilograms of polyethylene glycol (the number-average relative molecular mass is 6000), 4.6 kilograms of isophorone diisocyanate, 90 kilograms of dimethylformamide, 16.0 × 10 dibutyltin dilaurate -3 kg, was added to another 500L reactor equipped with a stirrer, a thermometer and a reflux condenser, and reacted at a temperature of 80°C for 3 hours. Then add 1.2 kg of N-methyldiethanolamine, 2.3 kg of isophoron...

Embodiment 2

[0033] 60 kilograms of polyethylene glycol (the number average relative molecular mass is 6000), 4.6 kilograms of isophorone diisocyanate, 90 kilograms of dimethylacetamide, 16.0 × 10 dibutyltin dilaurate -3 kg, was added to a 500L reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and reacted at a temperature of 82°C for 3 hours. Then add 2.8 kg of 2,2-dimethylolpropionic acid, 6.9 kg of isophorone diisocyanate, and 35 kg of dimethylacetamide, control the temperature at 82°C, and react for 3 hours to obtain prepolymer I, which is set aside. 60 kilograms of polyethylene glycol (the number average relative molecular mass is 6000), 4.6 kilograms of isophorone diisocyanate, 90 kilograms of dimethylacetamide, 16.0 × 10 dibutyltin dilaurate -3kg, was added to another 500L reactor equipped with a stirrer, thermometer and reflux condenser, and reacted at a temperature of 82°C for 3 hours. Then add 2.4 kg of N-methyldiethanolamine, 6.9 kg of isophorone dii...

Embodiment 3

[0036] 60 kilograms of polyethylene glycol (the number-average relative molecular mass is 6000), 3.4 kilograms of hexamethylene diisocyanate, 90 kilograms of dimethyl sulfoxide, and 16.0×10 dibutyltin dilaurate -3 kg, was added to a 500L reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and reacted at a temperature of 85°C for 3 hours. Then add 1.4 kg of 2,2-dimethylolpropionic acid, 1.7 kg of hexamethylene diisocyanate, and 30 kg of dimethyl sulfoxide, control the temperature at 85°C, and react for 3 hours to obtain prepolymer I, which is set aside. 60 kilograms of polyethylene glycol (the number-average relative molecular mass is 6000), 3.4 kilograms of hexamethylene diisocyanate, 90 kilograms of dimethyl sulfoxide, and 16.0×10 dibutyltin dilaurate -3 kg into another 500L reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and reacted at a temperature of 85°C for 3 hours. Then add 1.2 kg of N-methyldiethanolamine, 1.7 ...

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Abstract

The invention discloses a preparation method of amphoteric ion type polyurethane hydrogel. The preparation method mainly comprises the following steps of: (1) taking polyethylene glycol, aliphatic isocyanate, a catalyst and a solvent to react in a reaction kettle to obtain a polyurethane pre-polymer; and (2) adding the aliphatic isocyanate, a chain tender; a chain extender with an anionic radical and a solvent into the reaction kettle; continually reacting to obtain a pre-polymer I; repeating reactions of the steps (1) and (2) into the other reaction kettle and changing the chain extender with the anionic radical into a chain extender with a cationic radical to obtain a pre-polymer II pouring the pre-polymer I and the pre-polymer II into the same reaction kettle; adding a cross-linking agent containing hydroxyl and a solvent, and continually reacting to obtain a polyurethane solution; pouring the polyurethane solution into a mold and drying in vacuum; immersing in an alkaline water solution and adding an aziridine cross-linking agent and reacting to obtain polyurethane hydrogel; and immersing the polyurethane hydrogel in de-ionized water, and freezing and drying after immersion is finished to obtain a product.

Description

technical field [0001] The invention belongs to the technical field of production of zwitterionic polyurethane hydrogels, and in particular relates to a method for preparing polyurethane hydrogels having both anionic and cationic pH-sensitive functional groups and dual sensitivity to ambient temperature and pH. Background technique [0002] Hydrogel is a kind of high molecular network polymer containing hydrophilic groups that can swell but not dissolve in water. Among them, hydrogels that can sense changes in the external environment and respond intelligently to environmental changes are called environment-sensitive hydrogels. According to the different stimuli-response signals, environment-sensitive hydrogels can be divided into temperature-sensitive hydrogels, pH-sensitive hydrogels, magnetic field-sensitive hydrogels, electric field-sensitive hydrogels, and light-sensitive hydrogels. gel etc. [0003] With the improvement of functional requirements for polymer material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/38C08G18/34C08G18/10
CPCC08G18/10C08G18/3206C08G18/3844C08G18/4833C08G18/6692C08G2210/00C08G18/348C08G18/3275
Inventor 周虎余斌熊一帜周杰周智华欧宝立漆志凌
Owner HUNAN UNIV OF SCI & TECH