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Kede gum-silicon dioxide composite water/aerogel and its preparation method and application

A technology of composite hydrogel and silica, applied in the field of composite materials, can solve problems such as poor toughness, and achieve the effects of strong toughness, excellent light transmittance and low price

Active Publication Date: 2022-04-01
湛江市大树农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing silica gel has the problem of poor toughness, and conventional modification often requires crosslinking

Method used

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  • Kede gum-silicon dioxide composite water/aerogel and its preparation method and application
  • Kede gum-silicon dioxide composite water/aerogel and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0035] The preparation method of cod gum-silicon dioxide composite water / aerogel is as follows:

[0036] Step 1. Disperse 0.03 g of cod gum in 28 mL of water under stirring to obtain a cod gum aqueous dispersion with a mass dispersion concentration of 0.1%.

[0037] Step 2, dissolving tetraethyl orthosilicate in ethanol, and then adjusting the pH of the system to 3 with 0.1 mol / L dilute acetic acid, so that tetraethyl orthosilicate is hydrolyzed at 20°C to form silicic acid.

[0038] Step 3, adjust the pH value of the silicic acid obtained in step 2 to 6-7 with sodium hydroxide, and gradually drop the aqueous dispersion of cod gum obtained in step 1 into the silicic acid while stirring, so that cod gum is evenly dispersed in it, A hydrogel prototype is obtained.

[0039] Step 4: Seal the hydrogel prototype obtained in Step 3 with a plastic wrap and place it in a constant temperature water bath at 30° C. for 12 hours to form a wet hydrogel. The mass fraction of curd gum in th...

Embodiment 1-2

[0041] Step 1. Disperse 0.1 g of cod gum in 9.9 mL of water under stirring to obtain a cod gum aqueous dispersion with a mass dispersion concentration of 1.0%.

[0042] Step 2: Dissolving tetraethyl orthosilicate in ethanol, and then adjusting the pH of the system to 4 with 0.5 mol / L dilute acetic acid, so that tetraethyl orthosilicate is hydrolyzed at 30° C. to form silicic acid.

[0043] Step 3, adjust the pH value of the silicic acid obtained in step 2 to 6-7 with sodium hydroxide, and gradually drop the aqueous dispersion of cod gum obtained in step 1 into the silicic acid while stirring, so that cod gum is evenly dispersed in it, A hydrogel prototype is obtained.

[0044] Step 4: Seal the hydrogel prototype obtained in Step 3 with a plastic wrap and place it in a constant temperature water bath at 60° C. for 6 hours to form a wet hydrogel. The mass fraction of curd gum in the obtained hydrogel was 0.14%, and the mass fraction of silicon dioxide was 8.9%.

Embodiment 1-3

[0046] Step 1. Disperse 1 g of cod gum in 19 mL of water under stirring to obtain a cod gum aqueous dispersion with a mass dispersion concentration of 5.0%.

[0047] Step 2, dissolving tetraethyl orthosilicate in ethanol, and then adjusting the pH of the system to 5 with 1 mol / L dilute acetic acid, so that tetraethyl orthosilicate is hydrolyzed at 60° C. to form silicic acid.

[0048] Step 3, adjust the pH value of the silicic acid obtained in step 2 to 6-7 with sodium hydroxide, and gradually drop the aqueous dispersion of cod gum obtained in step 1 into the silicic acid while stirring, so that cod gum is evenly dispersed in it, A hydrogel prototype is obtained.

[0049]Step 4. Seal the hydrogel prototype obtained in Step 3 with a plastic wrap and place it in a constant temperature water bath at 90° C. for 3 hours to form a wet hydrogel. The mass fraction of curd gum in the obtained hydrogel was 1.5%, and the mass fraction of silicon dioxide was 9%.

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Abstract

The invention discloses cod gum-silicon dioxide composite water / aerogel, a preparation method and application thereof. The existing silica gel has the problem of poor toughness, and conventional modification often requires crosslinking. The codaran-silicon dioxide composite hydrogel of the present invention comprises codaran gum and silicon dioxide. Code gum and silica form an interpenetrating network structure. The codar gum-silicon dioxide composite airgel of the present invention comprises codar gum and silicon dioxide. Code gum and silica form an interpenetrating network structure. The present invention utilizes the different gel-forming characteristics of Ketchi gum at different temperatures, and also utilizes the two characteristics of Ketchi gum, which is stably dispersed in water and well dissolved in alkaline solution. A composite gel with an interpenetrating network structure of cod gum and silicon dioxide is formed. The water / air composite gel material is environmentally friendly, biodegradable, and has no secondary pollution, and has good application prospects in agriculture and industry.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and specifically relates to two aspects: one relates to a cod gum-silicon dioxide composite hydrogel material and its preparation method and its application in fields such as plant cultivation and crop planting; the other The invention relates to a Kede gum-silicon dioxide composite airgel material and its preparation method and its application in the field of sewage treatment and industry. It can be mainly used as an adsorption material, an isolation material and a coating material. Background technique [0002] Curdlan is a microbial polysaccharide fermented by Alcaligenes faecalis. Kede gum is another new type of polysaccharide produced by microbial fermentation after xanthan gum and gellan gum. In 1989, Kede gum was put into commercial production in Japan, and was recommended by the US Food and Drug Administration (FDA) for use in food in 1996. The polysaccharide is unbranched a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/00C08K3/36C08K9/06C08J3/075C08J9/28
CPCC08J3/075C08J9/28C08J2305/00C08K3/36C08K9/06
Inventor 孙燕伊佳伟寿周翔杨柳任迎港张燕妮王磊方晓军夏远乾
Owner 湛江市大树农业科技有限公司