Preparation method of polyvinyl alcohol phytate

A technology of polyvinyl alcohol phytate and polyvinyl alcohol, which is applied in the field of preparation of polyvinyl alcohol phytate, can solve the problems of difficult modification and modification of phytic acid molecules, and achieves improved coordination ability, high electronegativity, Rich application effects

Inactive Publication Date: 2020-04-07
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcoming that existing phytic acid molecules are difficult to modify and modify, and utilize the strong coordination ability of phytic acid and metal ions to provide a preparation method of polyvinyl alcohol phytate

Method used

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[0020] In view of the above-mentioned shortcomings, in order to solve the shortcomings of the existing phytic acid molecules that are difficult to modify and modify, and utilize the strong coordination ability of phytic acid and metal ions. The invention provides a preparation method of polyvinyl alcohol phytate and metal ion coordination hydrogel

[0021] Polyvinyl alcohol phytate is prepared by the esterification reaction between the hydroxyl group on the polyvinyl alcohol polymer chain and the phosphoric acid group on the phytic acid molecule, in which dimethyl sulfoxide (DMSO) is the solvent and urea is the catalyst. The water in the system will inhibit the positive progress of the esterification reaction, so it is necessary to add dicyandiamide as a dehydrating agent and toluene as a water-carrying agent

[0022] Polyvinyl phytate can be achieved through the following technical solutions:

[0023] A kind of preparation method of polyvinyl alcohol phytate, its preparation...

Embodiment 1

[0038] In parts by weight, 3 g of polyvinyl alcohol solid particles, 0.36 g of urea, 0.14 g of dicyandiamide and 150 mL of dimethyl sulfoxide (DMSO) were added into a three-necked flask, and a condensation device and a nitrogen protection device were set up. Heat and stir at 110°C until completely dissolved, then add 1 mL of 50% phytic acid solution and 0.1 mL of toluene;

[0039] After the reaction, the supernatant in the three-necked flask was dropped into absolute ethanol drop by drop, and the precipitate was collected and washed with absolute ethanol and acetone for several times until the pH of the filtrate was neutral; the precipitate was vacuum-dried at 60° C. for 48 h.

Embodiment 2

[0041] In parts by weight, 3 g of polyvinyl alcohol solid particles, 1.78 g of urea, 0.71 g of dicyandiamide and 150 mL of dimethyl sulfoxide (DMSO) were added to a three-necked flask, and a condensation device and a nitrogen protection device were set up. Heat and stir at 110°C until completely dissolved, then add 5 mL of phytic acid solution with a mass fraction of 50% and 0.5 mL of toluene;

[0042] After the reaction, the supernatant in the three-necked flask was dropped into absolute ethanol drop by drop, and the precipitate was collected and washed with absolute ethanol and acetone for several times until the pH of the filtrate was neutral; the precipitate was vacuum-dried at 60° C. for 48 h.

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Abstract

The invention provides a preparation method of polyvinyl alcohol phytate. The preparation method comprises the following steps: adding polyvinyl alcohol solid particles, urea, dicyandiamide and dimethyl sulfoxide into a three-neck flask, building a condensing device and a liquid separation device, carrying out heating and stirring until complete dissolution, dropwise adding a phytic acid solutionand methylbenzene, and after reaction for a period of time, enabling a mixture of methylbenzene and water to flow out of the liquid separation device; and after the reaction is finished, dropwise adding the supernatant part in the three-neck flask into absolute ethyl alcohol, collecting precipitates, carrying out washing with absolute ethyl alcohol and acetone until the pH of filtrate is neutral,and drying the precipitates in vacuum to obtain polyvinyl alcohol phytate. The invention relates to a polyvinyl alcohol and phytic acid modification method, which enriches the application of phytic acid. The invention relates to a method for preparing polyvinyl alcohol phytate through esterification reaction, urea is used as a catalyst, dicyandiamide is used as a dehydrating agent, methylbenzene is used as a water-carrying agent, and the method has higher esterification degree compared with other esterification reactions.

Description

technical field [0001] The invention relates to the field of functional hydrogel, in particular to a preparation method of polyvinyl alcohol phytate. Background technique [0002] Polyvinyl alcohol is a linear structure polymer containing a large number of hydrophilic hydroxyl groups. It has good film-forming properties, thermal stability, strong surface activity, excellent mechanical strength, low cost, and a wide range of sources. It is non-biologically toxic and is an ideal material for preparing hydrogels. However, the single polyvinyl alcohol hydrogel has limited its application in the field of functional hydrogel due to its lack of functionality. Synthesizing polyvinyl alcohol derivatives by chemical modification is a commonly used strategy at present. [0003] Phytic acid, scientifically called phytic acid, is a natural organic phosphate compound extracted from plant seeds. Each phytic acid molecule contains six phosphate groups, which can ionize a large number of ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/40C08F16/06
CPCC08F8/40C08F16/06
Inventor 张馨月张帅魏浩马宁王国军张智嘉欧阳肖王强高闪李瑞
Owner HARBIN ENG UNIV
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