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Silicotungstic acid intercalated multi-component hydrotalcite-like lightweight thermal insulation material and preparation method thereof

A lightweight thermal insulation and hydrotalcite technology, applied in the field of biomass foam materials, can solve the problems of low strength and thermal difference, and achieve the effects of low thermal conductivity, reduced heat and smoke release, and less addition

Active Publication Date: 2019-12-17
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lightweight refractory materials have disadvantages such as low strength and poor heat resistance. Therefore, research on lightweight refractory materials at home and abroad is currently focused on increasing the mechanical strength of the material and increasing the refractory temperature, including the addition of additives, preparation methods, etc. Research on the field, such as adding nanoparticles, refractory fibers, etc. to strengthen the material, etc.

Method used

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  • Silicotungstic acid intercalated multi-component hydrotalcite-like lightweight thermal insulation material and preparation method thereof
  • Silicotungstic acid intercalated multi-component hydrotalcite-like lightweight thermal insulation material and preparation method thereof
  • Silicotungstic acid intercalated multi-component hydrotalcite-like lightweight thermal insulation material and preparation method thereof

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preparation example Construction

[0036] A method for preparing a silicotungstic acid intercalated multi-element hydrotalcite / nanocellulose lightweight foam thermal insulation material in a specific embodiment of the present invention comprises the following steps:

[0037] (1) Prepare multi-component hydrotalcite-like precursors by co-precipitation method;

[0038] (2) modifying the hydrotalcite-like precursor in step (1) by an ion exchange method to obtain silicotungstic acid-multiple hydrotalcite-like;

[0039] (3) Mix silicotungstic acid obtained in step (2) with additives such as multi-component hydrotalcite, nanocellulose, and adhesive, and freeze-dry to obtain a lightweight foam material intercalated with silicotungstic acid and multi-component hydrotalcite nanocellulose .

[0040] The multi-element hydrotalcites are binary, ternary, quaternary or quinary hydrotalcites formed by divalent metal ions and trivalent metal ions, wherein the divalent metal ions M 2+ for Mg 2+ , Zn 2+ 、Ni 2+ , Ca 2+ , Fe...

Embodiment 1

[0059] (1) Press n(Zn 2+ ) / n(Mg 2+ ) / n(Al 3+ )=2:1:1 Weigh Zn(NO 3 ) 2 .9H 2 O, Mg(NO 3 ) 2 .6H 2 O and Al(NO 3 ) 3 .9H 2 O, adjust the pH value to 7.0, react at 70°C for 12h, and prepare ZnMgAl-NO by co-precipitation method 3 -LDHs.

[0060] (2) press m 主体 / m [SiW12O40]3 -=1:2 Accurately weigh a certain mass H 3 SiW 12 o 40 Dissolve in deionized water, neutralize with quantitative NaOH to obtain sodium silicotungstate solution. in N 2 Under the atmosphere, add the sodium silicotungstate solution drop by drop to the Zn / Al+-NO 3 - Stir vigorously in the LDHs main body slurry; make the reaction solution react at a set temperature of 60° C. for 14 hours. After repeated washing with deionized water, dry at 50°C under normal pressure for 24 hours to obtain ZnMgAl-SiW 12 o 40 -LDHs white solid.

[0061] (3) According to the dry weight mass percentage ratio of Table 2 (CNF+ZnMgAl-SiW 12 o 40 -LDHs+H 3 BO 3 Total 100%), the ZnMgAl-SiW 12 o 40 - LDHs slurry ...

Embodiment 2

[0067] (1) Press n(Zn 2+ ) / n(Mg 2+ ) / n(Ca 2+ ) / n(Al 3+ )=1:1:1:1 Weigh Zn(NO 3 ) 2 .9H 2 O, Mg(NO 3 ) 2 .6H 2 O, Ca(NO 3 ) 2 .4H 2 O, Al(NO 3 ) 3 .9H 2 O, adjust the pH value to 7.0, react at 70°C for 12h, and prepare ZnMgCaAl-NO by co-precipitation method 3 -LDHs.

[0068] (2) press m 主体 / m [SiW12O40]3 -=1:2 Accurately weigh a certain mass H 3 SiW 12 o 40 Dissolve in deionized water, neutralize with quantitative NaOH to obtain sodium silicotungstate solution. in N 2 Under the atmosphere, add the sodium silicotungstate solution drop by drop to the Zn / Al+-NO 3 - Stir vigorously in the LDHs main body slurry; make the reaction solution react at a set temperature of 60° C. for 14 hours. After repeated washing with deionized water, dry at 50°C under normal pressure for 24 hours to obtain ZnMgCaAl-SiW 12 o 40 -LDHs white solid.

[0069] (3) According to the dry weight mass percentage ratio of Table 3, the ZnMgCaAl-SiW 12 o 40 - LDHs slurry and CNF are mix...

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Abstract

The invention discloses a silicotungstic acid intercalated multi-component hydrotalcite-like lightweight thermal insulation material and a preparation method thereof. The preparation method comprisesthe steps: preparing a multi-component hydrotalcite-like precursor by a coprecipitation method; dropwise adding a silicotungstate solution into the multi-component hydrotalcite-like precursor slurry by an ion exchange method, and modifying the multi-component hydrotalcite-like precursor to obtain silicotungstic acid-multi-component hydrotalcite; and mixing the obtained silicotungstic acid-multi-element hydrotalcite, nano cellulose and an adhesive, and carrying out freeze drying to obtain the silicotungstic acid intercalated multi-element hydrotalcite lightweight thermal insulation material. The environment-friendly lightweight foam refractory material lightweight in weight, highly porous, low in heat conductivity coefficient and excellent in flame retardant effect is obtained; the nano-crystalline cellulose lightweight foam is endowed with excellent heat-conducting property and flame-retardant and heat-insulating effects by utilizing the synergistic flame retardancy of multi-componentmetal elements of the multi-component layered metal hydroxide and causing guest silicotungstic acid anions with a flame-retardant effect between layers of layered metal hydroxide.

Description

technical field [0001] The invention belongs to the field of biomass foam materials, and in particular relates to a hydrotalcite-like lightweight foam heat insulation material and a preparation method thereof. Background technique [0002] Lightweight foam refractories, also known as heat-insulating refractories and heat-insulating refractories, have the characteristics of high porosity, low bulk density, low thermal conductivity, and excellent heat resistance. Because the lightweight refractory material exhibits a certain high temperature load capacity, good thermal shock resistance, resistance to airflow erosion and wear, small heat capacity, and good heat insulation effect. Therefore, it occupies an indispensable and important position in the fields of aviation, aerospace, metallurgy, chemical industry, building materials, machinery and energy. In the light housing system, it can be used as a high-efficiency thermal insulation lightweight refractory material for wall des...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B20/02C04B38/00C04B111/28
CPCC04B20/023C04B28/00C04B38/00C04B2111/28C04B2201/32C04B14/30C04B24/383
Inventor 袁利萍吴袁泊汤连东黄自知王琼胡云楚王文磊袁光明吴义强胡进波文瑞芝
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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