Multi-functional hydrogel triggered by lignin phenolic resin silver-loaded nano spheres as well as preparation method and application thereof

A technology of phenolic resin and lignin, which is applied in the field of preparation of multifunctional hydrogels, can solve the problems of single function, long hydrogel gelation time, harsh reaction conditions, etc., and achieve wide sources, excellent water dispersibility, The effect of high mechanical strength

Active Publication Date: 2021-04-16
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies of the preparation methods in the prior art, especially th

Method used

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  • Multi-functional hydrogel triggered by lignin phenolic resin silver-loaded nano spheres as well as preparation method and application thereof
  • Multi-functional hydrogel triggered by lignin phenolic resin silver-loaded nano spheres as well as preparation method and application thereof
  • Multi-functional hydrogel triggered by lignin phenolic resin silver-loaded nano spheres as well as preparation method and application thereof

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preparation example Construction

[0034] In one or some embodiments of the present invention, a method for preparing a lignin composite hydrogel is provided, comprising the following steps:

[0035] Dissolving lignin, phenol, formaldehyde and sodium hydroxide in water, and centrifuging and drying the obtained solution after hydrothermal curing to obtain lignin phenolic resin nanospheres. The obtained lignin phenolic resin nanospheres were added into silver ammonia solution, stirred at room temperature and then centrifuged and dried to obtain LPRN@Ag.

[0036]The obtained LPRN@Ag and ferric chloride hexahydrate were mixed and stirred evenly in water, then an initiator and a crosslinking agent were added, and the multifunctional hydrogel was obtained by standing at room temperature.

[0037] In one or some embodiments of the present invention, a method for preparing the above-mentioned multifunctional hydrogel containing lignin-phenolic resin-loaded silver nanospheres is provided.

[0038] In one or some embodi...

Embodiment 1

[0063] Preparation of lignin phenolic resin loaded silver nanospheres:

[0064] The lignin-based phenolic resin nanospheres were optimally prepared according to the ratio of lignin to phenol (2:3, w / w). In detail, 0.32g of lignin, 0.48g of phenol, 0.76g of 37% formaldehyde solution and 0.0728g of NaOH were weighed and mixed well in aqueous ethanol (80mL of deionized water and 32mL of ethanol), and then the mixed solution was heated at 65°C Heat for 1 h, then heat at 90°C for 30 minutes. Afterwards, the mixed solution was transferred into a sealed stainless steel autoclave lined with polytetrafluoroethylene, and heated at 120 °C for 12 h, and then naturally cooled to room temperature. The solid product was collected by centrifugation (10000 rpm, 5 min), and washed three times with deionized water and ethanol, respectively. Finally, lignin-phenolic resin nanospheres were obtained by vacuum drying at 80 °C for 12 h.

[0065] Add 2 wt% ammonia solution to 20 mL of 10 mg·mL -1 ...

Embodiment 2

[0069] Preparation of lignin phenolic resin loaded silver nanospheres:

[0070] The lignin-based phenolic resin nanospheres were optimally prepared according to the ratio of lignin to phenol (2:3, w / w). In detail, 0.32g of lignin, 0.48g of phenol, 0.76g of 37% formaldehyde solution and 0.0728g of NaOH were weighed and mixed well in aqueous ethanol (80mL of deionized water and 32mL of ethanol), and then the mixed solution was heated at 65°C Heat for 1 h, then heat at 90°C for 30 minutes. Afterwards, the mixed solution was transferred into a sealed stainless steel autoclave lined with polytetrafluoroethylene, and heated at 120 °C for 12 h, and then naturally cooled to room temperature. The solid product was collected by centrifugation (10000 rpm, 5 min), and washed three times with deionized water and ethanol, respectively. Finally, lignin-phenolic resin nanospheres were obtained by vacuum drying at 80 °C for 12 h.

[0071] Add 2 wt% ammonia solution to 20 mL of 10 mg·mL -1 ...

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Abstract

The invention belongs to the technical field of functional materials, and relates to multi-functional hydrogel triggered by lignin phenolic resin silver-loaded nano spheres as well as a preparation method and application thereof. The preparation method of the multi-functional hydrogel containing the lignin phenolic resin silver-loaded nano spheres comprises the following steps: (1) preparing the lignin phenolic resin silver-loaded nano spheres: dissolving lignin, phenol, formaldehyde and sodium hydroxide in water, carrying out hydrothermal curing, and carrying out centrifugal drying on the obtained solution to obtain lignin phenolic resin nano spheres; and adding the obtained lignin phenolic resin nano spheres into a silver-ammonia solution, stirring at the room temperature, and carrying out centrifugal drying to obtain the lignin phenolic resin silver-loaded nano spheres. and (2) preparing the multi-functional hydrogel: uniformly mixing and stirring the obtained lignin phenolic resin silver-loaded nano spheres and ferric trichloride hexahydrate in water, then adding an initiator and a cross-linking agent, and standing at the room temperature to obtain the multi-functional hydrogel. The problems of complex hydrogel forming conditions and single function in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and specifically provides a method for preparing a multifunctional hydrogel triggered by lignin phenolic resin-loaded silver nanospheres. Background technique [0002] The statements herein merely provide background information related to the present invention and may not necessarily constitute prior art. [0003] Hydrogel is a kind of water-containing multifunctional polymer with three-dimensional network structure. Its unique properties such as flexibility and biocompatibility make it widely researched and applied in many fields such as electrical devices, sensors and biomedicine. However, how to prepare a multifunctional hydrogel with high mechanical strength, self-healing properties, electrical conductivity, antibacterial, and UV resistance is still a great challenge. [0004] Lignin is one of the three major components of wood fiber, second only to cellulose in content. At the...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/12C08G8/34C08L61/14C08K3/08C08F283/00C08F220/06
Inventor 吕高金崔涵姜炜坤刘玉吉兴香杨桂花
Owner QILU UNIV OF TECH
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