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CN-122011434-A - Super-strength hydrogel with carbon dot matrix Gao Hanshui rate and preparation method thereof

CN122011434ACN 122011434 ACN122011434 ACN 122011434ACN-122011434-A

Abstract

The invention discloses a super-strength hydrogel with a carbon dot matrix Gao Hanshui rate and a preparation method thereof, belonging to the technical field of hydrogel materials, mixing the hydrogel with a polyvinyl alcohol solution, constructing an initial hydrogel network through high-temperature reaction and freeze thawing circulation, and finally carrying out salting-out auxiliary treatment through a sodium lignin sulfonate solution. The invention creatively utilizes sodium lignin sulfonate carbon points as multifunctional nano filler, the functional groups on the surface of the nano filler can form multiple physical cross links with PVA chains, and simultaneously, sulfonate groups introduced in the salting-out process can form a unique water lock structure, thereby cooperatively solving the inherent contradiction between high water content and high strength. The hydrogel obtained by the invention has high water content, ultrahigh mechanical property and excellent stability, and the preparation process is green and simple, and has wide application prospect in the fields of flexible electronics, biomedical use and the like.

Inventors

  • WAN JIANYONG
  • MU GEGE
  • XU KAIMENG
  • KUANG FENG
  • YANG ZHENGYONG

Assignees

  • 西南林业大学

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. The preparation method of the super-strength hydrogel with the carbon dot matrix Gao Hanshui rate is characterized by comprising the following steps of: (1) Heating the sodium lignin sulfonate solution to prepare sodium lignin sulfonate carbon dot solution; (2) Mixing the sodium lignin sulfonate carbon dot solution with polyvinyl alcohol, heating, cooling, and performing freeze thawing cycle treatment to obtain sodium lignin sulfonate carbon dot-polyvinyl alcohol hydrogel; (3) And adding the sodium lignosulfonate carbon dot-polyvinyl alcohol hydrogel into a sodium lignosulfonate solution for salting out, and finally obtaining the super-strength hydrogel with the carbon dot matrix Gao Hanshui rate.
  2. 2. The method for preparing a super hydrogel with a carbon dot matrix Gao Hanshui rate according to claim 1, wherein in the step (1), the dosage ratio of sodium lignin sulfonate in the sodium lignin sulfonate solution to water is 0.5-4 g/100 mL.
  3. 3. The method for preparing a super hydrogel with a carbon dot matrix Gao Hanshui rate according to claim 1, wherein in the step (1), the heating treatment is performed at 140-180 ℃ for 2-8 h.
  4. 4. The method for preparing a super hydrogel with a carbon dot matrix Gao Hanshui% rate according to claim 1, wherein in the step (2), the mass ratio of the sodium lignin sulfonate carbon dot solution to the polyvinyl alcohol is 5:1.
  5. 5. The method for preparing a super hydrogel with a carbon dot matrix Gao Hanshui rate according to claim 1, wherein in the step (2), the heating condition is that the heating temperature is 95 ℃ and the heating time is 4 h.
  6. 6. The method for preparing a super hydrogel with a carbon dot matrix Gao Hanshui rate according to claim 1, wherein in the step (2), the steps of freeze-thawing cycle treatment are as follows: freezing 12h at-20deg.C, thawing 3 h at 20deg.C, the cycle was completed 3 times with freeze-thawing as one cycle.
  7. 7. The method for preparing a super hydrogel with a carbon dot matrix Gao Hanshui rate according to claim 1, wherein in the step (3), the mass concentration of the sodium lignin sulfonate solution is 10% -40%.
  8. 8. The method for preparing a super hydrogel with a carbon dot matrix Gao Hanshui rate according to claim 1, wherein in the step (3), the salting-out time is 12: 12h.
  9. 9. A carbon dot based Gao Hanshui rate superplastic hydrogel prepared by the method of any one of claims 1-8.
  10. 10. The super hydrogel of claim 9, wherein said super hydrogel of carbon dot matrix Gao Hanshui and Gao Hanshui has a tensile strength of 120.52 MPa and a toughness of 32221.3 MJ/m 3 .

Description

Super-strength hydrogel with carbon dot matrix Gao Hanshui rate and preparation method thereof Technical Field The invention belongs to the technical field of hydrogel materials, and particularly relates to a carbon dot based Gao Hanshui-rate super-strong hydrogel and a preparation method thereof. Background Hydrogels, due to their unique conductivity, flexibility and three-dimensional porous structure, have broad prospects in the fields of flexible electronics, biomedical science, energy storage, and the like. However, the traditional hydrogel is often poor in mechanical property due to single network structure, loss of energy dissipation mechanism and stress concentration effect, and is difficult to combine high strength and high toughness. Although the performance of the composite material is improved by constructing strategies such as double networks, hybridization crosslinking or directional freezing, the composite material has a fresh system which can simultaneously realize the breaking strength of more than 50 MPa and the toughness of 200 MJ m -3, and particularly under the premise of keeping high water content (> 70%). In recent years, nanofillers (such as carbon nanotubes, graphene and the like) are introduced into hydrogels to enhance mechanical properties, but the nanofillers are poor in compatibility with polymer matrixes, easy to agglomerate, and have a limited reinforcing effect due to weak physical adsorption. In addition, the nano material has complex preparation and higher cost, and limits the wide application. Carbon Dots (CDs) have gained widespread attention as an emerging class of carbon nanomaterials since being discovered in 2004 due to their excellent optical properties, biocompatibility and controllable surface properties, but their application in the mechanical enhancement of composite materials is still in the preliminary stage. Sodium lignin sulfonate is a byproduct of the paper industry, is rich in sources and low in cost, and the molecular structure of the sodium lignin sulfonate is rich in functional groups such as sulfonic acid groups, phenolic hydroxyl groups and alcoholic hydroxyl groups. If it is converted into carbon point, it is hopeful to become a high-performance low-cost nano filler. However, the improvement of mechanical properties is still limited by simply introducing carbon dots into the hydrogel system. Therefore, a new strategy is urgently needed to fully utilize the advantages of low-cost nanofillers and to skillfully solve the inherent contradiction between high water content and high strength of hydrogels. Disclosure of Invention Aiming at the technical problems, the invention provides a carbon dot based Gao Hanshui-rate super-strong hydrogel and a preparation method thereof. In order to achieve the above purpose, the present invention provides the following technical solutions: a preparation method of a carbon dot based Gao Hanshui-rate super-strong hydrogel comprises the following steps: (1) Heating the sodium lignin sulfonate solution to prepare sodium lignin sulfonate carbon dot solution; (2) Mixing the sodium lignin sulfonate carbon dot solution with polyvinyl alcohol, heating, cooling, and performing freeze thawing cycle treatment to obtain sodium lignin sulfonate carbon dot-polyvinyl alcohol hydrogel; (3) And adding the sodium lignosulfonate carbon dot-polyvinyl alcohol hydrogel into a sodium lignosulfonate solution for salting out, and finally obtaining the super-strength hydrogel with the carbon dot matrix Gao Hanshui rate. Optionally, in the step (1), the dosage ratio of the sodium lignin sulfonate in the sodium lignin sulfonate solution to the deionized water is 0.5-4 g/100 mL. Optionally, in step (1), the temperature of the heating treatment is 140-180 ℃ and the time is 2-8 h. Optionally, in the step (2), the mass ratio of the sodium lignin sulfonate carbon dot solution to the polyvinyl alcohol is 5:1. Optionally, in the step (2), the heating condition is that the heating temperature is 95 ℃ and the heating time is 4h. Optionally, in step (2), the step of freeze-thawing cycle treatment is as follows: freezing 12h at-20deg.C, thawing 3 h at 20deg.C, the cycle was completed 3 times with freeze-thawing as one cycle. Optionally, in the step (3), the mass fraction of the sodium lignin sulfonate solution is 10-40%. Optionally, in step (3), the salting-out time is 12h. A super-strength hydrogel with a carbon dot group Gao Hanshui rate is prepared by the preparation method. Optionally, the carbon dot matrix Gao Hanshui-rate super-strong hydrogel has a tensile strength of 120.52 MPa and a toughness of 32221.3 MJ/m 3. Compared with the prior art, the invention has the following advantages and technical effects: According to the invention, sodium lignin sulfonate carbon points are used as nanofillers, and a salting-out effect is combined to cooperatively construct a high-performance hydrogel system. The sensitivity of polyvinyl alcohol to Hofmeister effect a