Phosphotungstic acid intercalated hydrotalcite light foam thermal insulating material and preparation method thereof
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A technology of lightweight foam and heat insulating material, applied in the field of biomass foam material, can solve the problems of low strength and poor heat resistance, and achieve the effects of low thermal conductivity, improved flame retardancy and less addition
Active Publication Date: 2020-01-17
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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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.
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preparation example Construction
[0036] The preparation method of the phosphotungstic acid intercalation Zn / Al hydrotalcite / nanocellulose lightweight foam material of a specific embodiment of the present invention comprises the following steps:
[0037] (1) Preparation of Zn / Al hydrotalcite precursor by co-precipitation method;
[0038](2) modifying the Zn / Al hydrotalcite precursor in step (1) by ion exchange to obtain phosphotungstic acid-Zn / Al hydrotalcite;
[0039] (3) Mix phosphotungstic acid-Zn / Al hydrotalcite, nanocellulose, adhesive and other additives obtained in step (2), and freeze-dry to obtain phosphotungstic acid intercalated Zn / Al hydrotalcite nanocellulose Lightweight foam material.
[0040] In a preferred embodiment, the co-precipitation method is: weigh the zinc salt and the aluminum salt to form a mixed salt solution in an ion molar ratio of 2:1-3:1, and 2 Under the atmosphere, use sodium hydroxide to adjust the pH value to 6-9, stir evenly, heat up to 50-90°C, and the reaction time is 6-2...
Embodiment
[0058] (1) Press n(Zn 2+ ) / n(Al 3+ )=3:1 Weigh Zn(NO 3 ) 2 9H 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 ZnAl-NO by co-precipitation method 3 -LDHs.
[0059] (2) press m 主体 / m [PW12O40]3 -=1:2 Accurately weigh a certain mass H 3 PW 12 o 40 Dissolve in deionized water, neutralize with quantitative NaOH to obtain sodium phosphotungstate solution. in N 2 Under the atmosphere, the sodium phosphotungstate solution was added dropwise to the ZnAl-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 under normal pressure at 50°C for 24 hours to obtain ZnAl-PW 12 o 40 -LDHs white solid.
[0060] (3) According to the dry weight mass percentage ratio (CNF+ZnAl-PW) of Table 2 12 o 40 -LDHs+H 3 BO 3 Total 100%), the ZnAl-PW 12 o 40 - LDHs slurry and CNF are mixed and stirred evenly; and a certa...
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Abstract
The invention discloses a phosphotungstic intercalated hydrotalcite type light foam thermal insulating material and a preparation method thereof. The preparation method comprises the following steps:preparing a Zn / Al hydrotalcite precursor by using a coprecipitation method; dropping a phosphotungstate solution into the slurry of the Zn / Al hydrotalcite precursor by using an ion exchange method, performing modification on the Zn / Al hydrotalcite precursor so as to obtain phosphotungstic acid-Zn / Al hydrotalcite; and mixing the phosphotungstic acid-Zn / Al hydrotalcite with a nano cellulose adhesiveand an adhesive, and performing freeze-drying, so as to obtain the phosphotungstic intercalated hydrotalcite type light foam thermal insulating material. By adopting heteropolyphosphotungstic acid intercalation modified ZnAl-LDHs, problems that as a flame retardant, single ZnAl-LDHs is large in addition amount, low in flame retardant efficiency, and the like, can be solved, and meanwhile, with the characteristics of light weight, high Young's modulus, high strength and renewability of the nano cellulose, the foam material has the characteristics of low density, high strength, green environmental protection, and the like.
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] With the increasingly serious problem of environmental pollution and the depletion of petroleum resources, the research and development of biodegradable, resource-rich, and recyclable lightweight heat-insulating and fire-resistant insulation materials has become a major problem that needs to be solved urgently in the society. Lightweight heat insulation Fireproof insulation materials can effectively reduce energy loss and improve energy utilization. Due to their excellent characteristics, they have been widely developed and applied in the fields of aviation, aerospace, chemical industry, construction, machinery, storage and energy. However, lightweight refractory materials have disadvantages such as low strength and poor heat resistance. T...
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