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A kind of biodegradable composite hydrogel and its preparation method and application

A composite hydrogel, biodegradation technology, applied in the application of adsorbing heavy metals, degradable composite hydrogel and its preparation field, can solve the problems of weak hydrogel strength, poor mechanical strength, application limitations, etc. Low cost, improved mechanical properties and stability, low equipment requirements

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ye Manhui et al. also synthesized polyaspartic acid / lignocellulose hydrogel for the treatment of Pb 2+ Although it meets the characteristics of biodegradable materials, it has the defect of poor mechanical strength, and its application is limited.
In addition, although the hydrogel materials constructed by natural polymers have good biocompatibility and degradability, the strength of most hydrogels is relatively weak, which greatly limits their application in the field of water treatment.

Method used

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  • A kind of biodegradable composite hydrogel and its preparation method and application
  • A kind of biodegradable composite hydrogel and its preparation method and application
  • A kind of biodegradable composite hydrogel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: the preparation of PSI

[0041] Take 39.6 parts of maleic anhydride in the reactor, add 40 mL of deionized water, and hydrolyze at 60°C for 30 minutes. Next, ammonia water was added under ice-water bath conditions, wherein the molar ratio of ammonia water to maleic anhydride was 1.2:1, and then the temperature was raised to 85° C. for 2 h, and then dried to obtain a white ammonium salt solid for later use. Take 20 parts of ammonium salt and 2 parts of solid acid catalyst into the reaction kettle, then add 200mL of propylene carbonate, open the reaction kettle, polymerize at a constant temperature of 180°C for 2 hours, cool down to 80°C after completion, turn off the instrument, and take out The reaction solution. Add absolute ethanol to the reaction solution, extract and separate the liquid to obtain the intermediate product polysuccinimide (PSI), and obtain the PSI solid for future use after drying.

[0042] The molecular weight distribution of the PSI ...

Embodiment 2

[0043]Embodiment 2: the preparation of hydrogel:

[0044] (1) Take 4g PSI and disperse it in a beaker with 20mL deionized water for magnetic stirring, then add 1g linear polymer sodium alginate (purchased by Aladdin, viscosity 200±20mpa.s) and 2g montmorillonite (add Ultrasound is required for 0.5h to disperse evenly). After mixing evenly, add 15 mL of hydrazine hydrate (crosslinking agent) with a mass fraction of 98% and 10 mL of NaOH (hydrolyzing agent) solution with a concentration of 2 mol / L, and make the mixed solution at a pH of 9 to 10 at a room temperature of 20°C-30°C. Stirring reaction is carried out under the environment of environment, and cross-linking, hydrolysis are simultaneously carried out in the process, and reaction is completed after 8 hours, and the precipitate produced is the required composite hydrogel.

[0045] (2) washing the hydrogel to remove unreacted chemical substances therein; it can be washed directly, or can be washed with water after removin...

Embodiment 3

[0047] It is basically the same as Example 2, except that the addition amount of montmorillonite is changed to 0.2g, 0.4g, 0.6g, 0.8g, 1g, 1.2g, 1.4g, 1.6g, 1.8g to obtain a degradable composite Hydrogels.

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Abstract

The invention discloses a biodegradable composite hydrogel, its preparation method and application. The composite hydrogel is a semi-interpenetrating network structure formed by polyaspartic acid and sodium alginate, and montmorillonite is distributed in the semi-interpenetrating network structure of the gel in a lamellar structure; the composite hydrogel The gel is obtained from polysuccinimide, sodium alginate and montmorillonite with a molecular weight of 10,000-15,000 and a purity greater than 98%, and hydrazine hydrate as a cross-linking agent through cross-linking and alkaline hydrolysis. The mass ratio of polysuccinimide, sodium alginate and montmorillonite is 4:0.4‑1.2:0.5‑2. The composite hydrogel provided by the invention has good mechanical strength and stability; the raw materials used in its preparation method all have good biocompatibility, are easy to degrade, and have wide sources, low cost, and the preparation process is simple and easy to operate, realizing cross-linking The hydrolysis is carried out synchronously; the composite hydrogel is applied in the adsorption of heavy metal ions, and has the characteristics of fast, efficient and high adsorption capacity.

Description

[0001] (1) Technical field [0002] The invention belongs to the fields of functional polymer materials and environmental protection, and more specifically relates to a degradable composite hydrogel, a preparation method thereof and an application in adsorbing heavy metals. [0003] (2) Technical background [0004] In recent years, with the rapid development of industry, environmental pollution, especially heavy metal pollution, has become one of the serious problems that must be controlled. Heavy metal ions are mainly produced by metal plating equipment, battery manufacturing, metallurgy and electrolytic plating industries. Unlike organic pollutants, heavy metals are not biodegradable and can accumulate, posing significant hazards to human health and the environment. Therefore, toxic metals must be removed from wastewater to protect the environment and organisms. [0005] Currently, various methods are being used to remove toxic metals, including co-precipitation, ion excha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08L5/04C08K7/00C08J3/075C08J3/24C08G73/10B01J20/26B01J20/28B01J20/30C02F1/28
CPCB01J20/267B01J20/28047C02F1/288C02F2101/20C08G73/10C08G73/1092C08J3/075C08J3/246C08J2379/08C08J2405/04C08K7/00C08K2201/011
Inventor 童东绅万敏胡军
Owner ZHEJIANG UNIV OF TECH
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