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A kind of red powder grafted polyacrylic acid hydrogel and preparation method thereof

A technique of grafting polyacrylic acid and polyacrylic acid, which is applied in the field of red powder grafted polyacrylic acid hydrogel and its preparation, hydrogel and its preparation, can solve the problem of increased response time to environmental changes, poor physical and mechanical properties, and long response time and other problems, to achieve the effect of improving the utilization rate of raw materials, excellent expansion performance, and fast response speed

Inactive Publication Date: 2019-06-04
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the current research on environment-sensitive hydrogels has been extensive, there are still obvious defects in the environment-sensitive hydrogels in the prior art.
The specific performance is that its response time to environmental stimuli is too long, its sensitivity is low, and it cannot respond to environmental changes in time.
Moreover, the environmental sensitive hydrogels in the prior art have relatively poor physical and mechanical properties. In order to meet the requirements of use, the thickness of the material must be increased, and the increase in thickness will result in low sensitivity and increased response time to environmental changes.

Method used

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  • A kind of red powder grafted polyacrylic acid hydrogel and preparation method thereof
  • A kind of red powder grafted polyacrylic acid hydrogel and preparation method thereof
  • A kind of red powder grafted polyacrylic acid hydrogel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1-5

[0048] A preparation method of red powder grafted polyacrylic acid hydrogel, specifically comprises the steps:

[0049] (1) Preparation of red powder-g-N, N-methylenebisacrylamide macromer:

[0050] ①Weigh 0.5g-2g of red powder and N,N-methylenebisacrylamide respectively, and set aside;

[0051] ②Prepare 8mL-300mL mixed solvent of ethanol and water, and add the weighed red powder and N, N-methylenebisacrylamide into the mixed solvent and stir evenly;

[0052] ③Add Ce(SO 4 ) 2 , carry out grafting reaction, prepare red powder-g-N, N-methylenebisacrylamide macromer solution;

[0053] (2) Preparation of red powder grafted polyacrylic acid hydrogel:

[0054] a. Measure 1mL-2mL of acrylic acid with a neutralization degree of 50%-70%, and set aside;

[0055] b. Weigh 5mg-20mg initiator and 0.02g-1g cross-linking agent respectively, and set aside;

[0056] c. Take the red powder-g-N,N-methylenebisacrylamide macromer solution prepared in the above step ③, add the spare acrylic aci...

Embodiment 4-6

[0062] A preparation method of red powder grafted polyacrylic acid hydrogel, specifically comprises the steps:

[0063] (1) Preparation of red powder-g-N, N-methylenebisacrylamide macromer:

[0064] ①Weigh 0.5g-2g of red powder and N,N-methylenebisacrylamide respectively, and set aside;

[0065] ② Prepare 8mL-300mL mixed solvent of ethanol and water, add the weighed red powder and N, N-methylenebisacrylamide into the mixed solvent and stir evenly;

[0066] ③While adding Ce(SO 4 ) 2 , carry out grafting reaction, prepare red powder-g-N, N-methylenebisacrylamide macromer solution;

[0067] (2) Preparation of red powder grafted polyacrylic acid hydrogel:

[0068] a. Preparation of polyacrylic acid prepolymer:

[0069] (a) Measure 1mL-2mL of acrylic acid with a neutralization degree of 50%-70%, and weigh 0.02g-1gN, N-methylene bisacrylamide and 5mg-20mg ammonium persulfate for later use;

[0070] (b) Mix the weighed acrylic acid, N,N-methylenebisacrylamide and ammonium persu...

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Abstract

Red powder grafted polyacrylic acid hydrogel is prepared from a macromonomer of red powder-g-N,N-methylene acrylic amide and an acrylic acid monomer through free radical copolymerization reaction chemical combination, or is prepared from a macromonomer of red powder-g-N,N-methylene acrylic amide and a polyacrylic acid prepolymer through free radical copolymerization reaction chemical combination;and the red powder grafted polyacrylic acid hydrogel can generate response on the stimulation of the pH value of the environment, and has excellent expansion property, anti-oxidative property, salt tolerance and biocompatibility. Meanwhile, the invention discloses a preparation method of the red powder grafted polyacrylic acid hydrogel. The method is simple, practical, high in safety coefficient and high in production efficiency, thereby having a good development prospect.

Description

technical field [0001] The invention relates to a hydrogel and a preparation method thereof, in particular to a red powder grafted polyacrylic acid hydrogel and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Hydrogel is a kind of polymer network system, which is soft in nature, can absorb a large amount of water and can maintain a certain shape. It is a part of hydrophobic groups and hydrophilic residues introduced into water-soluble polymers with a network crosslinked structure. Prepared, wherein the combination of hydrophilic residues and water molecules can connect the water molecules inside the network, while the hydrophobic residues will make the system swell when it encounters water. According to the response of hydrogels to external stimuli, they can be divided into two categories: traditional hydrogels and environment-sensitive hydrogels. Traditional hydrogels are not sensitive to changes in the environment s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/38C08F289/00
CPCC08F222/385C08F289/00C08F220/06
Inventor 马艳丽刘梦钰刘颖方桂珍
Owner NORTHEAST FORESTRY UNIVERSITY