Preparation method of lignin chelated stannous hydrogel

A technology of lignin and hydrogel, which is applied in the field of preparation of lignin chelated stannous hydrogel, can solve the environmental impact of tin and other problems, and achieve the effects of short time consumption, simple extraction method, and cheap and easy-to-obtain raw materials

Active Publication Date: 2021-06-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tin is usually considered to have a certain impact on the environment and is blindly replaced.
As a result, it has rarely been used in the preparation of multifunctional hydrogels

Method used

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  • Preparation method of lignin chelated stannous hydrogel
  • Preparation method of lignin chelated stannous hydrogel
  • Preparation method of lignin chelated stannous hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example was carried out as follows.

[0034] (1) Take 50g of fir powder, 48g of NaOH and 600mL of deionized water into a 1L autoclave, and react at 120°C for 2h. Filter the resulting mixture to get the supernatant, then adjust the liquid to pH<2 with concentrated hydrochloric acid, let stand, centrifuge, and wash with deionized water until neutral, freeze-dry the sample at -50°C for 48 hours to obtain the base Lignin.

[0035] (2) Add 0.005g of alkali lignin, 0.06g of stannous chloride, and 3.2g of acrylamide into deionized water and mix thoroughly, then drop 0.02g of ammonium persulfate into the mixture, and keep stirring until polymerization forms a gel .

[0036] in, figure 2 A picture showing the as-prepared lignin@Sn hydrogel, the thickness of the hydrogel in this state is about 2 mm. Depend on figure 2 It can be seen that the hydrogel has good transparency and can be stretched. image 3 Scanning electron microscopy (SEM) images of the as-prepared lign...

Embodiment 2

[0040] This example was carried out as follows.

[0041] (1) Obtain alkali lignin according to step (1) of Example 1.

[0042] (2) The operation of step (2) is carried out with reference to the corresponding steps in Example 1, except that the content of alkali lignin in step (2) is 0.010 g.

[0043] Under these conditions, the formation time of the hydrogel obtained is about 8s; the tensile strength is about 20kPa, and the deformation can reach 1600%; the transparency is 90%; the conductivity is 41S m -1 .

Embodiment 3

[0045] This example was carried out as follows.

[0046] (1) Obtain alkali lignin according to step (1) of Example 1.

[0047] (2) The operation of step (2) is carried out with reference to the corresponding steps in the embodiment one, and the difference is that in the step (2), the tin protochloride content is 0.12g.

[0048] Under these conditions, the formation time of the hydrogel obtained is about 5s; the tensile strength is about 16kPa, and the deformation can reach 1100%; the transparency is 85%; the conductivity is 46S m -1 .

[0049] Based on this, this embodiment also treats different Sn 2+ The influence of the concentration on the gel formation time and gel performance was studied, that is, the contents of stannous chloride were 0.2wt%, 0.4wt%, 0.6wt% and 0.8wt%. Figure 4 shows that the formation time of lignin@Sn hydrogels varies with Sn 2+ change in concentration. It can be seen from the figure that with the Sn in the system 2+ The formation time of the hy...

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Abstract

The invention discloses a preparation method of a lignin chelated stannous hydrogel. The method is characterized by comprising the following steps: a) extracting lignin from biomass; and b) mixing lignin, a stannous compound and a propenyl monomer to form a mixed aqueous solution, and then polymerizing under the action of an initiator to form the hydrogel. According to the invention, lignin used in the method is extracted from biomass, so that the method has the advantages of low pollution and low cost, and industrial production is favorably realized; and the prepared hydrogel can be used in the fields of intelligent biological materials, food safety, biological medicine and the like, and the hydrogel material is easy to biodegrade and has extremely high potential value.

Description

technical field [0001] The invention belongs to the field of natural polymer materials, and in particular relates to a preparation method of lignin chelated stannous hydrogel. Background technique [0002] Hydrogels have attracted extensive attention in the fields of stretchable bioelectronics, soft robotics, and environmental restoration. Most hydrogels are composite materials prepared by multiple cross-linking of polymers, metal ion-polymer coordination and host-guest supramolecular interactions (J. Sun, Nature 2012, 489, 133-136). However, the practical application of hydrogels is often limited by their mechanical properties such as brittleness and low ductility. For example, most hydrogels are easily fractured under mechanical force due to the lack of mechanisms to resist energy dissipation under external force. In addition, the preparation methods of multifunctional hydrogels usually require certain external stimuli (temperature, light, etc.), or need to add toxic che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08F289/00C08F220/56C08F220/06C08L51/00
CPCC08J3/075C08F289/00C08J2351/00C08F220/56C08F220/06
Inventor 林鹿闫贵花曾宪海孙勇唐兴
Owner XIAMEN UNIV
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