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Method for preparing porous aquagel using wave polymerisation technology

A technology of porous hydrogel and wave polymerization, applied in the field of polymer materials, can solve the problems of time strict mass production limitation, difficulty in uniform distribution of bubbles, and lack of porous materials, and achieves controllable and repeatable structure. The effect of good performance and simple process

Inactive Publication Date: 2007-06-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of the above-mentioned patent, the generation of bubbles is through the reaction of carbonate and acidic substances. In order to obtain a hydrogel with a uniform pore structure, it is necessary to strictly control the addition time of the foaming agent within an extremely precise range. Too early, the polymerization has not yet started, and the bubbles have already been generated, so the bubbles cannot be captured by the polymer, and a porous material cannot be obtained; too late, the dense polymer has formed, and it is difficult to make the bubbles evenly distributed
The time-rigority of this foaming and polymerization makes the patented technology extremely limited in large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A glassy cylindrical vessel closed at one end, with an inner volume of 30 ml, used as a reactor. 6 grams of lactenamide was dissolved in 3 milliliters of water to form a solution, 0.06 grams of potassium persulfate, 0.008 grams of N, N-methylenebisacrylamide was dissolved in 2 milliliters of water, 0.36 grams of sodium bicarbonate was dissolved in 3 milliliters of water, 0.12 gram of PF127 surfactant was dissolved in 1 ml of water, and the solutions used were mixed after dissolution. Add 0.06 g of sodium carboxymethyl cellulose powder to the mixed solution, stir and mix evenly, pour it into the reactor, and heat at any end of the reactor with a resistance wire to decompose the initiator by heat. After the reaction starts, the heat source is removed, and the reaction is maintained by exothermic polymerization until all monomers in the entire reactor are completely converted into polymer gels. After the reactor cools down to room temperature naturally, the gel is taken o...

Embodiment 2

[0025] The same reactor as in Example 1 was used. 6 g of acrylamide was dissolved in 3 ml of water to make a solution, 0.24 g of ammonium persulfate, 0.0018 g of N, N-methylenebisacrylamide was dissolved in 3 ml of water, 1.2 g of sodium bicarbonate was dissolved in 10 ml of water, 0.6 g PF127 surfactant was dissolved in 2 ml of water, and the solutions used were mixed after dissolution. Add 0.6 g of sodium carboxymethylcellulose powder to the mixed solution, stir and mix evenly, and pour it into the reactor. Other operations are the same as in Example 1. The product is soaked in distilled water for 10 hours, and the product after alcohol dehydration is placed in an oven at 50 ° C. After drying, a porous hydrogel with a pore size of 2-7 microns is obtained.

Embodiment 3

[0027] With the same reactor as Example 1, 6 grams of acrylamide was dissolved in 3 milliliters of water to form a solution, 0.1 gram of ammonium persulfate was dissolved in 2 milliliters of water, 0.6 gram of sodium bicarbonate was dissolved in 6 milliliters of water, 0.3 gram of PF127 surfactant Dissolve in 2 milliliters of water, after all the solutions are mixed, add 0.012 grams of superfine kaolin, 0.2 grams of sodium carboxymethyl cellulose powder, stir and mix evenly and pour into the reactor, other operations are the same as in Example 1, and the product is soaked in distilled water After 5 hours, the product after alcohol dehydration was dried in an oven at 70°C to obtain a porous hydrogel with a pore size of 0.5-3 microns.

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Abstract

The present invention provides wave polymerization process to prepare porous hydrogel, and belongs to the field of high molecular material preparing technology. The technological process includes the following steps: dissolving monomer, initiator, cross-linking agent, foaming agent and surfactant in certain weight proportion in water to compound solution; adding thickener via stirring; injecting the mixed liquid into cylindrical reactor, heating to decompose the initiator and igniting for reaction; eliminating heat source and maintaining the reaction with heat released during polymerization until all the monomer is converted into polymer gel; taking out gel, cutting into blocks in certain sizes, soaking in distilled water for 5-24 hr, dewatering with alcohol, and stoving at 50-70 deg.c in an oven to obtain the product. The process can obtain hydrogel with pore size of 0.5-10 microns.

Description

technical field [0001] The invention belongs to the technical field of macromolecular materials, and particularly provides a method for preparing porous hydrogel by adopting wave polymerization technology. The foaming agent is dispersed in the polymerization system in a molecular state, and decomposes on the polymerization wave interface to generate gas, so a porous material with uniform and easy-to-control pore structure can be obtained. The prepared hydrogel can be used for drug slow-release agents, biological tissue engineering scaffolds, superabsorbents and the like. Background technique [0002] Hydrogel is a network polymer that can absorb a large amount of water without dissolving. It has good biocompatibility. The bioactive molecules fixed in the hydrogel can exist for a long time, so it is used as a scaffold for biological tissue engineering. Materials, drug delivery vehicles, soft contact lenses, etc.; widely used as water-absorbing agents because of their super w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08F20/56C08F2/44C08K5/20
Inventor 燕青芝葛昌纯
Owner UNIV OF SCI & TECH BEIJING