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Preparation method of polyurethane hydrogel with two types of pH sensitive groups

A hydrogel and polyurethane technology, which is applied in the field of polyurethane hydrogel preparation, can solve problems such as the inability to reflect the intelligent response characteristics of pH, and achieve the effect of improving mechanical properties and expanding the scope of application

Active Publication Date: 2016-11-09
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, temperature and pH dual responsive hydrogels usually can only produce intelligent responses to specific temperature and pH. When the environmental pH value changes greatly, the pH response characteristics of the hydrogel only exist in a specific area, and other areas It cannot reflect the pH intelligent response characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 200 kilograms of polyethylene glycol (number-average relative molecular mass of 20000), 3.6 kilograms of toluene diisocyanate, and 300 kilograms of dimethylformamide into a 1000L reactor equipped with a stirrer, a thermometer and a reflux condenser. React at 80°C for 3 hours. Then, 1.5 kg of 2,2-dimethylolbutyric acid, 1.8 kg of toluene diisocyanate, and 90 kg of dimethylformamide were added, the temperature was controlled at 80° C., and the reaction was carried out for 3 hours to obtain prepolymer I for use. Add 200 kilograms of polyethylene glycol (number-average relative molecular mass of 20000), 3.6 kilograms of toluene diisocyanate, and 300 kilograms of dimethylformamide into another 1000L reactor equipped with a stirrer, thermometer and reflux condenser. React at a temperature of 80°C for 3 hours. Then, 1.4 kg of N-ethyldiethanolamine, 1.8 kg of toluene diisocyanate, and 90 kg of dimethylformamide were added, the temperature was controlled at 80° C., and the r...

Embodiment 2

[0031] Add 200 kilograms of polyethylene glycol (number-average relative molecular mass of 20000), 3.6 kilograms of toluene diisocyanate, and 300 kilograms of dimethylacetamide into a 1000L reactor equipped with a stirrer, thermometer and reflux condenser. React at 82°C for 3 hours. Then, 3.0 kg of 2,2-dimethylolbutyric acid, 5.4 kg of toluene diisocyanate, and 95 kg of dimethylacetamide were added, the temperature was controlled at 82° C., and the reaction was carried out for 3 hours to obtain prepolymer I for use. Add 200 kilograms of polyethylene glycol (number-average molecular weight of 20000), 3.6 kilograms of toluene diisocyanate, and 300 kilograms of dimethylacetamide into another 1000L reactor with a stirrer, thermometer and reflux condenser. React at a temperature of 82°C for 3 hours. Then, 2.8 kg of N-ethyldiethanolamine, 5.4 kg of toluene diisocyanate, and 95 kg of dimethylacetamide were added, the temperature was controlled at 82° C., and the reaction was carried ...

Embodiment 3

[0034] Add 200 kilograms of polyethylene glycol (number-average relative molecular mass of 20000), 5.2 kilograms of diphenylmethane diisocyanate, and 300 kilograms of dimethyl sulfoxide into a 1000L reactor equipped with a stirrer, thermometer and reflux condenser , React at 85°C for 3 hours. Then, 1.5 kg of 2,2-dimethylolbutyric acid, 2.6 kg of diphenylmethane diisocyanate, and 90 kg of dimethyl sulfoxide were added, the temperature was controlled at 85° C., and the reaction was carried out for 3 hours to obtain prepolymer I for use. Add 200 kilograms of polyethylene glycol (number-average relative molecular mass of 20000), 5.2 kilograms of diphenylmethane diisocyanate, and 300 kilograms of dimethyl sulfoxide to another 1000L reaction with a stirrer, thermometer and reflux condenser In the kettle, react at 85°C for 3 hours. Then, 1.4 kg of N-ethyldiethanolamine, 2.6 kg of diphenylmethane diisocyanate, and 90 kg of dimethyl sulfoxide were added, the temperature was controlled ...

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Abstract

The invention discloses a preparation method of polyurethane hydrogel with two types of pH sensitive groups. The preparation method mainly comprises: (1) taking polyethylene glycol, aliphatic isocyanate and a solvent to react in a reaction kettle to obtain a polyurethane pre-polymer; (2) adding the aliphatic isocyanate, a chain extender with an acidic group and a solvent into the reaction kettle and continually reacting to obtain a pre-polymer I; repeating the steps (1) and (2) in the other reaction kettle, and replacing the chain extender with the acidic group with a chain extender with an acidic group and reacting 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; charging the polyurethane solution into a mold and drying in vacuum and immersing the mold into an alkaline water solution; adding an aziridine cross-linking agent and reacting to obtain the polyurethane hydrogel; immersing the polyurethane hydrogel with de-ionized water and freezing and drying after finishing immersion to obtain a product.

Description

Technical field [0001] The invention relates to the technical field of production of polyurethane hydrogels, in particular to a method for preparing a polyurethane hydrogel with both acid and alkali zwitterionic pH response functional groups and dual sensitivity to temperature and pH. Background technique [0002] Smart hydrogel is a network polymer polymer that can significantly swell in water but is insoluble in water. It can induce stimulation signals such as temperature, pH, magnetic field, electric field, and light in the external environment, and can make Intelligent response. With the deepening of research and the complication of application conditions, a single intelligent response hydrogel can no longer adapt to the development trend of polymer materials. Therefore, the research enthusiasm and development efforts of dual or multiple smart response hydrogels have been significantly strengthened. The so-called dual or multiple smart response hydrogel refers to the abilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C08G18/66C08G18/48C08G18/34C08G18/32C08G18/12C08L75/08
CPCC08G18/0823C08G18/12C08G18/324C08G18/3275C08G18/348C08G18/4833C08G18/6692C08J3/075C08J3/24C08J2375/08
Inventor 周虎余斌熊一帜唐友新刘国清刘玄王东东
Owner HUNAN UNIV OF SCI & TECH