A hydrogel preparation method

A technology of hydrogel and cross-linking agent, which is applied in the field of preparing hydrogel, can solve the problems of low heating efficiency, uneven heating, temperature reduction, etc., and achieve the effects of saving energy, speeding up preparation, and heating uniformly

Active Publication Date: 2006-02-08
NHWA PHARMA CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of heating is not only complicated to operate, but also requires a long heating time, and the heating is uneven, the temperature decreases from the outside to the inside, and there is a temperature gradient
What's more unfortunate is that conventional heating is inefficient and a lot of heat energy is wasted

Method used

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  • A hydrogel preparation method
  • A hydrogel preparation method
  • A hydrogel preparation method

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preparation example Construction

[0010] The method for preparing hydrogel of the present invention is described in detail as follows in conjunction with embodiment:

[0011] The method of the present invention comprises the following steps:

[0012] 1) After mixing vinyl monomers, crosslinking agents and initiators, dissolve them in a solvent to make a reaction system. The weight ratio of each component in the reaction system is: monomer: crosslinking agent: initiator: solvent=100: 2-50: 0.2-1: 1-10;

[0013] 2) It is obtained by irradiating and heating the reaction system by using microwaves with a frequency of 2450MHz or microwaves with frequency conversion of 300MHz-300GHz.

[0014] The power of the microwave or variable-frequency microwave can be 75 watts to 10,000 watts, and the irradiation heating takes 1-30 minutes.

[0015] The structural formula of the ethylenic monomer can be a or b:

[0016]

[0017] where R1 = H, CH 3 ; R2=OR4, NR4R5; The structural formula of R3 is e, f or g:

[0018] ...

Embodiment 1

[0026] Dissolve 10g of acrylamide, 0.5g of N,N'-methylenebisacrylamide and 10mg of azobisisobutyronitrile in 40ml of water, blow in high-purity nitrogen, vacuumize, repeat degassing three times, and seal the tube under vacuum. Then put the sealed tube into a microwave oven with a frequency of 2450 MHz and select an output power of 340 watts to irradiate for 2 minutes. The obtained hydrogel was washed with water and dried. Yield 90%.

Embodiment 2

[0028] Mix 10g acrylamide, 2g acrylic acid, 0.5g N,N'-methylenebisacrylamide and 10mg azobisisobutyronitrile, dissolve in 50ml water, degas three times with high-purity nitrogen, seal the tube under vacuum, and then Put the sealed tube into a microwave oven and irradiate it with 75W microwaves with a frequency in the range of 300MHz-300GHz for 20 minutes. Wash, tumble dry. Yield 88%.

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Abstract

The invention provides a process for preparing aqueous gel comprising the following steps, mixing and dissolving alkene group monomer, cross linking agent and initiating agent by the ratio of 100:2-50:0.2-1:1-10, using microwave having a frequency of 2450MHz or frequency changed microwave of 300MHz-300GHz for radiation to the reaction system.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a method for preparing hydrogel Background of the invention [0002] Hydrogels can swell in water but cannot be dissolved, which is very similar to human tissue. Hydrogels have broad application prospects in the fields of biology, medicine and pharmaceutical preparations. [0003] In the preparation of hydrogels, for example the preparation of poly(N-isopropylacrylamide) and poly(N-vinylcaprolactam), document J.Polym.Sci., PartA: Polym.Chem., 1992, 30 (10) , 2121-2129 and Macromol.Chem.Phys., 1996, 197, 1973-1982 using conventional oil bath heating. Conventional heating, such as oil bath, air bath and sand bath heating, etc., belongs to the traditional conduction heating. This kind of heating is not only complicated to operate, but also requires a long heating time, and the heating is uneven, and the temperature decreases from the outside to the inside, and there is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075
Inventor 石绍华张桂森
Owner NHWA PHARMA CORPORATION
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