Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing porous aquagel using wave polymerisation of microcapsule foaming agent

A technology of microcapsules and foaming agents, applied in the field of polymer materials, can solve problems such as lack of porous materials, difficulty in uniform distribution of air bubbles, strict time constraints on large-scale production, etc., to achieve controllable and easy-to-adjust pore size, highly operable effect

Inactive Publication Date: 2006-04-26
UNIV OF SCI & TECH BEIJING
View PDF5 Cites 5 Cited by
  • 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
On the other hand, we found in experiments that bare carbonate particles do not react with acid in some organic solvents such as dimethyl sulfoxide, and do not decompose when heated, so the chemical foaming method in this organic phase system Apps are also limited

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A glassy cylindrical vessel closed at one end, with an inner volume of 100 ml, used as a reactor. The solution of 20 grams of acrylic acid monomer components, neutralized to pH 7 with 30% (percentage by weight) of sodium hydroxide; 0.04 grams of N, N-methylenebisacrylamide, 0.5 grams of ammonium persulfate, 0.6 grams of PF127 A solution of the surfactant was dissolved in 10 ml of water and mixed with the monomer solution. Add 2 grams of sodium carboxymethyl cellulose powder and 4 grams of microcapsule particles to the mixed solution, stir and mix evenly, pour into the reactor, heat at any end of the reactor with a resistance wire, and 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 was naturally cooled to room temperature, the gel was taken out, cut into 5mm thick cylin...

Embodiment 2

[0027] The same reactor as in Example 1 was used. 20 grams of acrylamide was dissolved in 40 milliliters of water to make a solution, 0.6 gram of potassium persulfate, 0.02 gram of N, N-methylenebisacrylamide, and 2 grams of PF127 surfactant were dissolved in 20 milliliters of water to make a solution after dissolving. and mixed with the monomer solution. Add 2 grams of sodium carboxymethyl cellulose powder and 2 grams of microcapsule particles to the mixed solution, stir and mix evenly and then pour it into the reactor. Other operations are the same as in Example 1. The product is soaked in distilled water for 18 hours. The product is dried in an oven at 50°C to obtain a porous hydrogel with a pore size of 3-15 microns.

Embodiment 3

[0029] With the same reactor as Example 1, add 10 grams of acrylic acid monomer, add 3 milliliters of water to dilute; 0.1 gram of ammonium persulfate and 0.8 gram of PF127 are dissolved in 5 milliliters of water to form a solution, and after mixing with the monomer solution, add 0.08 grams of Superfine kaolin powder, 3 grams of microcapsule particles, and 0.7 gram of sodium carboxymethylcellulose powder are fully stirred and mixed. Other operations were the same as in Example 1, the product was soaked in distilled water for 24 hours, and the product after alcohol dehydration was dried in an oven at 70°C to obtain a porous hydrogel with a pore size of 20-100 microns.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Apertureaaaaaaaaaa
Apertureaaaaaaaaaa
Apertureaaaaaaaaaa
Login to View More

Abstract

The present invention provides wave polymerization process with microcapsule foaming agent to prepare porous hydrogel, and belongs to the field of high molecular material preparing technology. The technological process includes the following steps: dissolving monomer, surfactant, initiator, and cross-linking agent in certain weight proportion in solvent to compound solution; adding microcapsule and 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 has the advantages of no influence of reaction medium pH value and activity on the foaming agent, powerful operation performance, controllable pore size, etc.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular provides a method for preparing porous hydrogel by wave polymerization using a microcapsule foaming agent. The foaming agent that produces a porous structure is self-made microcapsule particles. 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 three-dimensional cross-linked polymer that can swell in water and retain a large amount of water without dissolving, and small hydrophilic molecules can diffuse in it. Hydrogels have good biocompatibility, and the bioactive molecules immobilized in hydrogels can exist for a long time, so they are used as biotissue engineering scaffold materials, drug release carriers, soft contact lenses, etc. In order to improve the swelling and deswelling rate of hydrogel in aqueous solution and the transfer rate o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08J3/075C08J9/02C08J9/06
Inventor 葛昌纯燕青芝
Owner UNIV OF SCI & TECH BEIJING