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Aquagel with high water absorbing capacity and preparation method thereof

A hydrogel and high water absorption technology, applied in the field of polymer synthesis and modification, can solve the problems of difficult processing and low water absorption, and achieve the effects of high water absorption, improved compatibility, and easy industrialization.

Active Publication Date: 2012-06-20
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two major disadvantages of hydrogels determine that they are not easy to be modified by physical methods.
[0006] However, in the prior art, the hydrogel prepared by the chemical modification method usually has the technical defects of low water absorption and difficult processing, and it is necessary to further improve the performance of the hydrogel.

Method used

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  • Aquagel with high water absorbing capacity and preparation method thereof
  • Aquagel with high water absorbing capacity and preparation method thereof
  • Aquagel with high water absorbing capacity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In a 250ml four-necked flask, add 60g of water and 4.8g of polyvinyl alcohol (PVA-124, the degree of polymerization is 2450, Shanghai Aladdin Company), start mechanical stirring, the time of nitrogen is 30min, and heat up to 80°C , add 1 / 5 amount of ammonium persulfate (ie 0.0338g, the total amount is 0.169g), 3.09g-2-hydroxyethyl methacrylate and 1.71g acrylic acid, then add 1 / 5 amount of persulfuric acid at intervals of 0.5h Ammonium (ie 0.0338 g). After reacting for 1.5h (1 / 5 amount of ammonium persulfate was added 3 times, totaling 0.1014g), 30g of water, N,N'-methylenebisacrylamide (0.185g), 14.4g of acrylic acid (neutralized 0.7) and the remaining ammonium persulfate (ie 0.0676g), continue the reaction at 80°C for 2.5h, raise the temperature to 85°C, keep it warm for 1h and then lower it to 25°C to obtain a high water absorption hydrogel product.

Embodiment 2

[0046] In a 250ml four-neck flask, add 60g of water and 4.8g of polyvinyl alcohol (PVA-124, the degree of polymerization is 2450, Shanghai Aladdin Co., Ltd.), start the mechanical stirring, the time of nitrogen is 30min, and heat up to 70°C , add 1 / 5 amount of ammonium persulfate (ie 0.0186g, the total amount is 0.093g), 3.09g-2-hydroxyethyl methacrylate and 1.71g acrylic acid, and then add 1 / 5 amount of persulfuric acid at intervals of 0.5h Ammonium (ie 0.0186 g). After reacting for 1.5h (1 / 5 amount of ammonium persulfate was added 3 times, totaling 0.0558g), 20g of water, N,N'-methylenebisacrylamide (0.0822g), 6.4g of acrylic acid (neutralized 0.7) and the remaining ammonium persulfate (ie 0.0372g), continue the reaction at 70°C for 2.5h, raise the temperature to 95°C, keep it warm for 0.5h and then lower it to 15°C to obtain a high water absorption hydrogel product.

Embodiment 3

[0048] In a 250ml four-necked flask, add 60g of water and 4.8g of polyvinyl alcohol (PVA-124, the degree of polymerization is 2450, Shanghai Aladdin Co., Ltd.), start the mechanical stirring, the time of nitrogen is 30min, and heat up to 75°C , add 1 / 5 amount of ammonium persulfate (ie 0.0248g, the total amount is 0.124g), 3.09g 2-hydroxyethyl methacrylate and 1.71g acrylic acid, then add 1 / 5 amount of persulfuric acid at intervals of 0.5h Ammonium (ie 0.0248g). After reacting for 1.5h, add 25g of water, N,N`-methylenebisacrylamide (0.123g), 9.6g of acrylic acid (0.7 in neutralization degree) and the remaining ammonium persulfate (0.0496g), at 75°C Continue to react for 3 hours, raise the temperature to 85°C, keep it warm for 1 hour and then lower it to 35°C to obtain a high water absorption hydrogel product.

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Abstract

The invention discloses aquagel with high water absorbing capacity. The aquagel is prepared from the following raw materials in percentage by weight: 4-12 percent of polyvinyl alcohol, 70-90 percent of water, 5-20 percent of water-soluble monomers, 0.04-0.4 percent of an initiator and 0.03-0.3 percent of a crosslinking agent. The aquagel with high water absorbing capacity has the appearance characteristics of colorlessness and transparency, has high water absorbing capacity, and is easy for film forming. The invention further discloses a preparation method of the aquagel with high water absorbing capacity. The method comprises the following steps of: dissolving polyvinyl alcohol into a part of water under the conditions of mechanical stirring and nitrogen protection; adding a first water-soluble monomer and a part of the initiator; reacting at the temperature of 70-80 DEG C for 1-2 hours; adding the remaining water, a second water-soluble monomer, the remaining initiator and the crosslinking agent; polymerizing for 2-4 hours, and raising the temperature to 85-95 DEG C; and preserving heat for 0.5-1.5 hours, and cooling to the room temperature to obtain aquagel with high water absorbing capacity. The aquagel has the advantages of high operability, high controllability, easiness for industrial implementation, and the like.

Description

technical field [0001] The invention relates to the field of synthesis and modification of polymers, in particular to a hydrogel with high water absorption rate and a preparation method thereof. Background technique [0002] Hydrogel is a hydrophilic cross-linked polymer with a three-dimensional network structure that can swell in water, absorb and retain a large amount of water without dissolving in water. Hydrogels have a relatively fixed shape, and although the water molecules inside are bound in the gel network, they still have certain mobility. The special structure of the hydrogel system is similar to the structure of organisms, so it has the behavior similar to biological systems. Hydrogel has good biocompatibility, and has only weak interaction with immobilized enzymes or cells, which can keep biomolecules immobilized in hydrogel active for a long time. Due to the unique physical and chemical properties of hydrogels, they are widely used in food processing and pres...

Claims

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Application Information

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IPC IPC(8): C08F261/04C08F220/06C08F220/56C08F220/28C08F2/10
Inventor 高建青夏国龚韩旻李平
Owner ZHEJIANG UNIV
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