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Polyvinyl alcohol composite gel and its synthesis process

A polyvinyl alcohol and composite gel technology, applied in the field of polyvinyl alcohol composite gel and its synthesis, can solve the problems of complex preparation methods, difficult industrial production, and insufficient mechanical properties, and achieve simple procedures, easy control, and immobilization high efficiency effect

Inactive Publication Date: 2005-11-02
GANSU ACAD OF SCI INST OF BIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of ordinary PVA hydrogel is insufficient mechanical properties. If a cross-linked structure is introduced into the material, this defect can be made up, and its mechanical properties can be effectively improved. Through chemical cross-linking, radiation cross-linking, freezing-melting method Or compound with other materials, PVA can be properly modified to prepare polymer gels with various properties and different structures.
[0004] By searching the literature and patents, there are many preparation methods about PVA gel at present, such as Li Huazi [the improvement of the immobilization method of polyvinyl alcohol-boric acid, Environmental Science Research, 2002,15 (5)] etc. -The improvement of the boric acid immobilization method, specifically adopting the delayed embedding method and the method of adding chemical agents to adjust its strength, and for example USPT0910788 (1994) proposed the use of boric acid saturated solution hardening molding, all of which are based on boric acid. Compared with borax, its disadvantages are: the amount of boric acid is more than that of borax, the cross-linking time is longer, and the carrier strength is relatively poor
However, this kind of preparation method is complicated and difficult to be suitable for industrial production.

Method used

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  • Polyvinyl alcohol composite gel and its synthesis process
  • Polyvinyl alcohol composite gel and its synthesis process
  • Polyvinyl alcohol composite gel and its synthesis process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 8 parts of polyvinyl alcohol with a degree of alcoholysis of 99% (produced by Lanzhou Fiber Nylon Factory, with a degree of polymerization of 1750±50) into 100 parts of water at 85°C, stir while adding, and then add 4.4 parts of acrylic acid after the polyvinyl alcohol is completely dissolved. Triol, after stirring evenly, add 1 part of dextran-40 (dissolved in a small amount of water in advance), stir evenly, and then add 1 part of borax that has been dissolved while stirring continuously, and stir while adding, to carry out gelation After 2 to 5 minutes, slowly add 1 part of maleic anhydride solution, and keep stirring until there is no flocculent coagulation in the gel solution, and a transparent, slightly milky white viscous sol is obtained, which is polyvinyl alcohol For the composite gel, the above operations were all carried out at a constant temperature of 85°C. The composite gel liquid was frozen at -24°C and thawed at room temperature.

Embodiment 2

[0028] Repeat Example 1 with the following differences: 10 parts of polyvinyl alcohol with a degree of alcoholysis of 99% are dissolved in 100 parts of water at 85°C. Compared with "Example 1", the viscosity of the obtained composite gel solution is increased by 2.1%, the pore diameter and porosity of the carrier are slightly reduced, and the carrier strength is better.

Embodiment 3

[0030] Repeat Example 1 with the following differences: use 15 parts of polyvinyl alcohol with a degree of alcoholysis of 99% to be dissolved in 100 parts of water at 85°C. Compared with "Example 2", the viscosity of the obtained composite gel solution increased by 1.6%, and the pore diameter and porosity of the carrier decreased. The mechanical strength of the carrier after freeze forming is high.

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Abstract

the invention discloses a polyvinyl alcohol plural gel and its producing method. It can be got by recombinating following materials as such ratios: polyvinyl alcohol or 8-15, optimized polyvinyl alcohol for 8-12; elasticizer glycerin for 3-5, optimized elasticizer glycerin for 3.8-5; dextran-40 for 0.5-1.5 or carbowax-4000 for 2-4, optimized dextran-40 for 1.0-1.5 or carbowax-4000 for 3-4; cross linker borax for 0.5-2, optimized cross linker borax for 0.5-1.5; maleic acid for 0.5-2; optimized maleic acid for 0.5-1.5. The materials are without toxin, and the polyvinyl alcohol plural gel by the invention is of good bioavailability, pretty high mechanical strength and high density void, which can be used as solidified carriers of enzyme, microbial cell and animal and plant cell.

Description

technical field [0001] The invention relates to a polyvinyl alcohol composite gel and a synthesis method thereof. Background technique [0002] Polyvinyl alcohol (PVA) is a water-soluble polymer formed by hydrolysis and alcoholization of polyvinyl acetate. It is processed into PVA hydrogel through a certain process. It is characterized by its high elasticity, chemical stability, easy molding, Non-toxic, no side effects and good biocompatibility with human tissues, it is widely used in construction, electronics, textiles, medicine, fine chemicals, light industry and other industries. [0003] After years of development, people have invented many methods and techniques for the synthesis of polyvinyl alcohol gels and related polyvinyl alcohol carriers, and they have been widely used. The defect of ordinary PVA hydrogel is insufficient mechanical properties. If a cross-linked structure is introduced into the material, this defect can be made up, and its mechanical properties ca...

Claims

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Application Information

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IPC IPC(8): C08L29/04
Inventor 周剑平魏甲乾龚伟中杨晖王治业
Owner GANSU ACAD OF SCI INST OF BIOLOGY
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