Starch double-crosslinking network hydrogel and preparation method thereof

A double-crosslinking and hydrogel technology, applied in the field of natural biomacromolecule gel materials, achieves the effects of simple operation, compressive strength and compressive strain recovery, and strong mechanical strength

CN109354719AActive Publication Date: 2019-02-19JIANGNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-02-19

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Abstract

The invention discloses a preparation method of starch double-crosslinking network hydrogel, and belongs to the technical field of natural biomacromolecular gel materials. A retrogradation and freezethawing technology is adopted, biodegradable starch with good biological compatibility and PVA are used as raw materials, and starch/PVA/borax double-crosslinking network hydrogel is prepared from theraw materials and borax. The preparation method has the advantages of simplicity in operation, environmental protection, low cost and the like. The starch/PVA/borax double-crosslinking network hydrogel has mechanical characteristics of high stretching, high toughness, high mechanical strength and the like; secondarily, the starch/PVA/borax hydrogel has good shape plasticity and rapid and effective self-recovering property; and the starch double-crosslinking network hydrogel has good self-healing property in air and water, the hydrogel has good water resistance, and after swelling equilibriumis achieved, the compression strength and compression strain of the gel can be recovered remarkably.
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Description

technical field

[0001] The invention relates to a starch double-crosslinked network hydrogel and a preparation method thereof, belonging to the technical field of natural biological macromolecular gel materials. Background technique

[0002] A multi-component system "water material" composed of a three-dimensional polymer network and water, which only swells in water and is insoluble in water, and can absorb water hundreds or even thousands of times its own weight; hydrogel has good water absorption and water retention Due to its advantages of flexibility, biocompatibility, fast swelling, softness, rubber-like viscosity, environmental sensitivity and mechanical properties, it has been widely used in food, biology, medicine, agriculture, cosmetics and environmental engineering, such as pharmaceuticals Carriers, environmental adsorbents, pollutant cleaners and other products.

[0003] Water-soluble polyvinyl alcohol (PVA) is obtained by hydrolysis of polyvinyl acetate, and it...

Examples

Embodiment 1

[0048] Prepare starch / PVA / borax double cross-linked network hydrogel according to the following steps:

[0049] (1) Preparation of starch / PVA mixed sol: configure the concentration of PVA to be 3wt%, take 3g of PVA, dissolve it in 87mL deionized water, stir in a 95°C constant temperature water bath, 300r / min for 0.5h, the PVA is fully hydrated and swollen; To room temperature, add 10 g of cornstarch to the cooled PVA solution (the concentration of cornstarch is 10wt%), mix and stir at 300r / min, stir in a 95°C constant temperature water bath for 1.0h, and obtain a uniform starch / PVA mixed sol ;

[0050] (2) Preparation of starch / PVA / borax mixed sol: Take a certain amount of borax and add it to the starch / PVA mixed sol, the final concentration of borax is 0.026mol / L, heat in a constant temperature water bath at 95°C and stir at 250r / min for 1.0h , so that the borax is fully dissolved, the sol is ultrasonicated at 75°C for 3 minutes to remove air bubbles, and the starch / PVA / bora...

Embodiment 2

[0053] (1) Preparation of starch / PVA mixed sol: configure the concentration of PVA to be 4wt%, take 4g of PVA, dissolve it in 86mL of deionized water, stir in a 95°C constant temperature water bath, 300r / min for 0.5h, the PVA is fully hydrated and swollen; To room temperature, add 10 g of cornstarch to the cooled PVA solution (the concentration of cornstarch is 10wt%), mix and stir at 300r / min, stir in a 95°C constant temperature water bath for 1.0h, and obtain a uniform starch / PVA mixed sol ;

[0054] (2) Preparation of starch / PVA / borax mixed sol: Take a certain amount of borax and add it to the starch / PVA mixed sol, the final concentration of borax is 0.026mol / L, heat in a constant temperature water bath at 95°C and stir at 250r / min for 1.0h , so that the borax is fully dissolved, the sol is ultrasonicated at 75°C for 3 minutes to remove air bubbles, and the starch / PVA / borax mixed sol is obtained;

[0055] (3) Preparation of starch / PVA / borax double-crosslinked network hydro...

Embodiment 3

[0057] (1) Preparation of starch / PVA mixed sol: configure the concentration of PVA to be 5wt%, take 5g of PVA, dissolve it in 85mL of deionized water, put it in a constant temperature water bath at 95°C, stir at 100r / min for 2h, the PVA is fully hydrated and swollen; At room temperature, add 10 g of cornstarch to the cooled PVA solution (the concentration of cornstarch is 10wt%), mix and stir at 100 r / min, stir in a 95°C constant temperature water bath for 2.0h, and obtain a uniform starch / PVA mixed sol;

[0058] (2) Preparation of starch / PVA / borax mixed sol: Take a certain amount of borax and add it to the starch / PVA mixed sol, the final concentration of borax is 0.026mol / L, heat in a constant temperature water bath at 95°C and stir at 800r / min for 0.5h , so that the borax is fully dissolved, the sol is ultrasonicated at 75°C for 3 minutes to remove air bubbles, and the starch / PVA / borax mixed sol is obtained;

[0059] (3) Preparation of starch / PVA / borax double-crosslinked net...