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Biomass fully-degradable high-antibacterial high-water-absorption resin and preparation method thereof

A biomass and fully degradable technology, applied in the field of preparation of new biomass fully degradable high antibacterial and superabsorbent resin, can solve problems such as difficulty in ensuring the safety of the final product, inability to achieve full degradation of the resin, and difficulty in achieving comprehensive performance. , to achieve good reversibility and mechanical strength, good antibacterial properties, and broaden the scope of application.

Active Publication Date: 2022-03-01
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, domestic lignin-based superabsorbent resins are mostly focused on the improvement of a single performance, and it is difficult to achieve an all-round development of comprehensive performance.
Such as Chinese patent CN112048081A discloses a kind of high-strength lignin-based superabsorbent resin preparation method, but antibacterial activity is low; Chinese patent CN109503868B discloses a kind of degradable high antibacterial lignin-based hydrogel, but introduced Petroleum-based irritating raw materials such as acrylic acid cannot fully degrade the resin, and it is difficult to ensure the safety of the final product.

Method used

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  • Biomass fully-degradable high-antibacterial high-water-absorption resin and preparation method thereof
  • Biomass fully-degradable high-antibacterial high-water-absorption resin and preparation method thereof
  • Biomass fully-degradable high-antibacterial high-water-absorption resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of aldehyde-based lignin

[0028] a) Dissolve 5 g of sodium lignosulfonate in 50 g of 10 wt % sodium hydroxide aqueous solution.

[0029] b) The temperature was raised to 60° C., 7.5 g of formaldehyde was added to the system, and 5.6 g of chloroform was slowly added dropwise within 1 hour.

[0030] c) React for 3.5 hours, precipitate with absolute ethanol, let stand for 2 hours, and filter to collect the precipitate.

[0031] d) drying at 30° C. for 12 hours to obtain the modified aldylated lignin.

[0032] (2) Preparation of carboxymethyl chitosan

[0033] a) Add 5g of chitosan and 9g of sodium hydroxide into 50mL of 70wt% isopropanol aqueous solution, and swell at 50°C for 1h.

[0034] b) Slowly add 6g of chloroacetic acid dropwise to 10mL of isopropanol

[0035] c) Mix chitosan lye and chloroacetic acid solution, and react at 50° C. for 4 hours.

[0036] d) The volume fraction is 75% ethanol aqueous solution to remove excess sodium hydroxide, filte...

Embodiment 2

[0045] (1) Preparation of aldehyde-based lignin

[0046] a) Dissolving 6.3g of sodium lignosulfonate in 50g of 10 wt% sodium hydroxide.

[0047] b) The temperature was raised to 60° C., 9.2 g of formaldehyde was added to the system, and 7.1 g of chloroform was slowly added dropwise within 1 hour.

[0048] c) React for 3.5 hours, precipitate with absolute ethanol, let stand for 2 hours, and filter to collect the precipitate.

[0049] d) drying at 30° C. for 12 hours to obtain the modified aldylated lignin.

[0050] (2) Preparation of carboxymethyl chitosan

[0051] a) Add 6.2g of chitosan and 11g of sodium hydroxide into 50mL of 70 wt% isopropanol solution, and swell at 50°C for 1h.

[0052] b) 7.9 g of chloroacetic acid was slowly added dropwise to 10 mL of isopropanol.

[0053] c) Mix chitosan lye and chloroacetic acid solution, and react at 50° C. for 4 hours.

[0054] d) The volume fraction is 75% ethanol aqueous solution to remove excess sodium hydroxide, filter with ...

Embodiment 3

[0063] (1) Preparation of aldehyde-based lignin

[0064] a) Dissolving 5g of sodium lignosulfonate in 50g of 10 wt% sodium hydroxide.

[0065] b) The temperature was raised to 60° C., 6.7 g of formaldehyde was added to the system, and 5.6 g of chloroform was slowly added dropwise within 1 hour.

[0066] c) React for 3.5 hours, precipitate with absolute ethanol, let stand for 2 hours, filter, and take the precipitate.

[0067] d) drying at 30° C. for 12 hours to obtain the modified aldylated lignin.

[0068] (2) Preparation of carboxymethyl chitosan

[0069] a) Add 5 g of chitosan and 6.75 g of sodium hydroxide into 50 mL of 70 wt % isopropanol solution, and swell at 50° C. for 1 h.

[0070] b) Slowly add 6 g of chloroacetic acid to 10 mL of isopropanol dropwise.

[0071] c) Mix chitosan lye and chloroacetic acid solution, and react at 50° C. for 4 hours.

[0072] d) The volume fraction is 75% ethanol aqueous solution to remove excess sodium hydroxide, filter the precipita...

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Abstract

According to the biomass full-degradation high-antibacterial high-water-absorption resin provided by the invention, the prepared novel biomass full-degradation high-antibacterial high-water-absorption resin not only has good antibacterial performance, but also has high pure water absorption rate and high saline water absorption rate. Benefited from a Schiff base system, such as aldehyde and ammonia, with good reaction activity, good reversibility and mechanical strength are given to the super absorbent resin, and the practical application range of the novel super absorbent resin is widened to a certain extent.

Description

technical field [0001] The technology belongs to the field of superabsorbent resin research, and in particular relates to a preparation method of a novel biomass fully degradable high antibacterial superabsorbent resin. Background technique [0002] Super Absorbent Polymer (SAP) is a kind of water-swellable polymer containing strong water-absorbing groups such as carboxyl, hydroxyl, amide, and sulfonic acid groups, and has a certain three-dimensional space network structure. And it can absorb water hundreds of times or even thousands of times its own weight, and most of the water can be "locked" by itself, and it is difficult to discharge the water by common physical methods. Therefore, it is widely used in agriculture, gardening, personal hygiene and care, medicine, and industry. [0003] Superabsorbent resins can be classified into natural superabsorbent resins represented by starch, chitosan, and cellulose according to their sources, and synthetic superabsorbent resins r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C08L97/00C08L5/08
CPCC08J3/246C08J3/075C08J2397/00C08J2405/08
Inventor 唐涛费俊豪孙培涛王旭陈思马猛何荟文施燕琴
Owner ZHEJIANG UNIV OF TECH