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Bi-crosslinked gel foam based on polyphenol hydroxyl structure and preparation method thereof

A technology of polyphenol hydroxyl and gel foam, which is applied in the direction of fire prevention equipment, etc., can solve the problems of poor stability, achieve the effects of overcoming poor stability, excellent inhibition of coal oxidation and fire extinguishing effect, and excellent fire extinguishing effect

Active Publication Date: 2022-01-04
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a double-crosslinked gel foam based on polyphenolic hydroxyl structure and a preparation method thereof. By constructing a double-crosslinked system of polyphenolic hydroxyl structure in gel foam, the gel foam is greatly improved. It overcomes the poor stability of traditional gel foam and other problems, and has excellent effects of inhibiting coal oxidation and fire extinguishing

Method used

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  • Bi-crosslinked gel foam based on polyphenol hydroxyl structure and preparation method thereof
  • Bi-crosslinked gel foam based on polyphenol hydroxyl structure and preparation method thereof
  • Bi-crosslinked gel foam based on polyphenol hydroxyl structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.8g of sodium alginate and fully dissolve it in 98.35g of water, then add 0.1g of tea saponin and 0.2g of alkyl glycoside in proportion, after mixing evenly, add 0.15g of L-calcium lactate and 0.4g of Tannic acid, by mechanical agitation, forms a double cross-linked gel foam based on the structure of polyphenolic hydroxyl groups.

[0023] The prepared double-crosslinked gel foam was poured into a beaker, and the gelation time of the gel foam was measured by the inversion method. The results showed that the gelation time of the double-crosslinked gel foam was 1 min. Put 50g of coal samples treated with 21.4g of double cross-linked gel foam in a vacuum oven, and treat them under vacuum conditions at 30°C for 24 hours, and then conduct temperature-programmed oxidation tests and gas chromatograph analysis to record the process of coal sample temperature programming CO production in . The results show that the CO release rate of the treated coal sample is low before ...

Embodiment 2

[0027] Weigh 0.6g of sodium alginate and fully dissolve it in 98.2g of water, then add 0.1g of tea saponin and 0.2g of alkyl glycoside in proportion, after mixing evenly, add 0.1g of L-calcium lactate and 0.8g of Tannic acid, by mechanical agitation, forms a double cross-linked gel foam based on the structure of polyphenolic hydroxyl groups.

[0028] The gelation time was measured by the same method as in Example 1, and the results showed that the gelation time of the double cross-linked gel foam was 10min. The temperature-programmed oxidation test combined with gas chromatograph analysis shows that the CO release rate of the treated coal sample is low before 170°C, and the coal is in the slow oxidation stage at this temperature; after 170°C, the CO release rate is significantly accelerated, and the coal enters the rapid oxidation stage. stage, and finally at 200°C, the amount of CO released reached 5407.08ppm.

Embodiment 3

[0030] Weigh 0.4g of sodium alginate and fully dissolve it in 98.05g of water, then add 0.1g of tea saponin and 0.2g of alkyl glycoside in proportion, after mixing evenly, add 0.05g of L-calcium lactate and 1.2g of Tannic acid, by mechanical agitation, forms a double cross-linked gel foam based on the structure of polyphenolic hydroxyl groups.

[0031] Using the same method as in Example 1, the gelling time shows that the gelling time of this double-crosslinked gel foam is 15min; the double-crosslinked gel foam is analyzed for microstructure, and the results are as follows figure 2 As shown in the microstructure diagram of the double-crosslinked gel foam, it can be seen from the figure that the formed gel foam structure is relatively uniform and regular; the half-life of the gel foam measured by the standing method is 26 days; the double-crosslinked The CO release curve of the coal sample treated with gel foam during the temperature-programmed oxidation test is as follows i...

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Abstract

The invention relates to the field of application of coal fire prevention and extinguishing technologies, and provides double-crosslinking gel foam based on a polyphenol hydroxyl structure and a preparation method thereof. The gel foam is characterized by comprising 0.2-0.8% of a gel-forming matrix, 0.3% of a foaming system and 0.41-1.75% of a double-crosslinking system; the gel forming matrix is natural polysaccharide sodium alginate of brown algae; the foaming system is composed of tea saponin and alkyl glycoside; and the double-crosslinking system is composed of a substance containing a polyphenol hydroxyl structure and a weak electrolyte containing Ca<2+>. According to the double-crosslinking gel foam based on the polyphenol hydroxyl structure and the preparation method thereof, by constructing the double-crosslinking system of the gel foam, the stability of the gel foam is greatly improved, the problems that traditional gel foam is poor in stability and the like are solved, and the excellent effects of inhibiting coal oxidation and extinguishing fire are achieved. Meanwhile, the preparation process is simple and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of coal mine fire prevention and extinguishing, in particular to the technical field of a double-crosslinked gel foam based on a polyphenolic hydroxyl structure and a preparation method thereof. Background technique [0002] The 2020 World Energy Statistical Yearbook shows that global coal production has increased by 1.5%, and coal's share in the energy structure has reached 27%, second only to oil's 33.1%. This shows that coal resources are of great significance to promote the development of the global economy. However, the large demand for coal resources has led to the gradual increase in the depth and intensity of coal mining, and the number of natural disasters in coal mines has also increased. Among them, the spontaneous combustion caused by coal oxidation has caused a large number of property losses, casualties, and environmental degradation, which has caused severe harm to society. impact, while also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D1/02A62D1/00A62D1/04C09K21/06C09K21/14
CPCA62D1/0064A62D1/0071C09K21/14C09K21/06
Inventor 聂士斌韩超刘泽功李佳怡张浩然武薛强杨威
Owner ANHUI UNIV OF SCI & TECH
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