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Preparation method of PVA double-crosslinking hydrogel based on 2d resin

A hydrogel and double-crosslinking technology, which is applied in the field of preparation of PVA double-crosslinked hydrogels, can solve problems such as insufficient toughness, uncontrollable crosslinking degree, and restrictions on the practical application of PVA hydrogels, and achieve simple and easy process line, enhance the effect of mechanical strength and ductility

Pending Publication Date: 2022-04-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, PVA hydrogels face the same problems as most hydrogels, that is, insufficient toughness, poor mechanical properties, and poor stability, which limit the practical application of PVA hydrogels.
Physical and chemical cross-linking methods are the most important means to solve these problems, but these two methods have their own shortcomings. The cross-linking effect is remarkable, but there are disadvantages such as uncontrollable cross-linking degree and toxic cross-linking agent

Method used

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  • Preparation method of PVA double-crosslinking hydrogel based on 2d resin
  • Preparation method of PVA double-crosslinking hydrogel based on 2d resin
  • Preparation method of PVA double-crosslinking hydrogel based on 2d resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Add 1 g, 1.5 g, and 2 g of polyvinyl alcohol (PVA) to 9 g, 8.5 g, and 8 g of deionized water respectively, and add 0.05 g of citric acid and 0.1 g of magnesium chloride to the three solutions , stirring at 95°C for 2 hours, until the PVA is completely dissolved to form a uniform mass concentration of 10wt%, 15wt% and 20wt% PVA mixed solution;

[0032] Step 2: Place the PVA mixed solutions of three different mass concentrations prepared in step 1 in three beakers respectively, add 0.5 ml of 2d resin and 20 microliters of polyvinyl alcohol defoamer in each beaker, Stir vigorously by hand with a glass rod for 10 minutes at room temperature, then transfer to a mold, and let it stand at room temperature for 2 days. After the bubbles are completely eliminated, heat it in an oven at 80°C for 4 hours to obtain PVA / 2d SN with different PVA mass concentrations.

[0033] Step 3: Prepare a saturated borax solution, put PVA gels of different mass concentrations into and soak...

Embodiment 2

[0035] Step 1: Add 1.5 grams of polyvinyl alcohol to 8.5 grams of deionized water, add 0.05 grams of citric acid and 0.1 grams of magnesium chloride, and stir at 95°C for 2 hours until the PVA is completely dissolved to form a uniform mass concentration of 15wt % PVA mixed solution;

[0036] Step 2: Take the PVA mixed solution of step 1 and place them in four beakers respectively, add 20 microliters of polyvinyl alcohol defoamer to the above four beakers, and then add 0.2 ml, 0.5 ml, 0.7 ml and 1 ml respectively The 2d resin was stirred vigorously by hand with a glass rod for 10 minutes at room temperature, then transferred to a mold, and left to stand at room temperature for 2 days. After the air bubbles were completely eliminated, it was heated in an oven at 80°C for 4 hours to obtain single-layer resins with different 2d resin concentrations. Cross-linked network hydrogels;

[0037] Step 3: prepare a saturated borax solution, put the single-crosslinked network hydrogels co...

Embodiment 3

[0039] Step 1: Add 1.5 grams of polyvinyl alcohol to 8.5 grams of deionized water, add 0.05 grams of citric acid and 0.1 grams of magnesium chloride, and stir at 95°C for 2 hours until the PVA is completely dissolved to form a uniform mass concentration of 15wt % PVA mixed solution;

[0040] Step 2: Take the PVA mixed solution and place it in a beaker, add 0.5 ml of 2d resin and 20 microliters of polyvinyl alcohol defoamer into the beaker, stir vigorously with a glass rod at room temperature for 10 minutes, and then transfer it to a mold. Stand at room temperature for 2 days, and after the air bubbles are completely eliminated, heat in an oven at 80°C for 4 hours to obtain a network hydrogel (PVA / 2d SN) in which PVA is single-crosslinked by 2d resin;

[0041] Step 3: Prepare a saturated borax solution, put the obtained PVA gel into and soak for 30s, 60s, 70s, 90s and 110s respectively, and obtain four parts of the target product PVA / 2d DN hydrogel.

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Abstract

The invention provides a preparation method of PVA (polyvinyl alcohol) double-crosslinking hydrogel based on 2d resin, which comprises the following steps: step 1, adding PVA, citric acid and magnesium chloride into deionized water, and heating and stirring for 2 hours at 90-95 DEG C until PVA is completely dissolved to form a uniform PVA mixed solution; 2, adding 2d resin and a polyvinyl alcohol defoaming agent into the PVA mixed solution, uniformly stirring, drying in a drying oven at 80 DEG C for 4 hours, and cooling at room temperature to form a product PVA network hydrogel (PVA / 2d SN) which is subjected to single crosslinking through the 2d resin; 3, at the room temperature, the prepared PVA / 2d SN is put into a saturated borax solution to be replaced for a certain time, and the network hydrogel (PVA / 2d DN) obtained through 2d resin bi-crosslinking of PVA is obtained. The hydrogel prepared through the method has the excellent mechanical property and stability.

Description

technical field [0001] The invention relates to the field of preparation of PVA hydrogel, in particular to a preparation method of PVA double-crosslinked hydrogel based on 2d resin. Background technique [0002] Hydrogel is a kind of extremely hydrophilic three-dimensional network structure gel, which has attracted extensive attention due to its similar tissue structure and properties to biological bodies. As a material with high water absorption and high water retention, hydrogel is widely used in many fields. Various fields, such as food, medicine, cosmetics and other fields. Polyvinyl alcohol (PVA), as a safe organic polymer, has been widely used in hydrogels. [0003] However, PVA hydrogels face the same problems as most hydrogels, that is, insufficient toughness, poor mechanical properties, and poor stability, which limit the practical application of PVA hydrogels. Physical and chemical cross-linking methods are the most important means to solve these problems, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L29/04C08K3/38
CPCC08J3/075C08J3/246C08J3/243C08J2329/04C08K2003/387
Inventor 丁建宁张熠昕戴胜平程广贵张忠强
Owner JIANGSU UNIV
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