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Preparation method of high-temperature oxide nano-particle spaced vermiculite micro-nano sheet

A technology of high-temperature oxides and nanoparticles, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve problems such as difficult separation, and achieve a good peeling effect

Active Publication Date: 2021-07-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The vermiculite suspension obtained by chemical stripping has a water content of more than 70%. After drying, the vermiculite sheets stick together and are difficult to separate. It is not suitable for the enhanced use of dry process of nano powder materials.

Method used

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  • Preparation method of high-temperature oxide nano-particle spaced vermiculite micro-nano sheet
  • Preparation method of high-temperature oxide nano-particle spaced vermiculite micro-nano sheet

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preparation example Construction

[0023] The invention provides a method for preparing vermiculite micro-nano sheets spaced by high-temperature oxide nanoparticles, the process flow of which is as follows figure 1 shown. Choose raw materials such as quartz and clay with an impurity content of less than 0.5%, and fine-grained, ultra-fine-grained or micro-grained natural vermiculite raw ore with a particle size of less than 10 mesh on a standard sieve. After washing with deionized water for 1 to 3 times, centrifuge or vacuum dehydrate and set aside. In the vermiculite raw ore particles, the vermiculite mineral content is more than 50%, and it is better to use more pure vermiculite with a vermiculite content of more than 90% as the vermiculite raw material. Ca 2+ , Mg 2+ , Fe 2+ Etc replacement, soluble Li salt or Na salt as a chemical modifier, such as lithium citrate, sodium citrate, lithium ethylenediaminetetraacetate, sodium ethylenediaminetetraacetate, lithium nitrilotriacetate, sodium nitrilotriacetate,...

Embodiment 1

[0029] Wash the raw natural vermiculite whose particle size is between 20 mesh and 40 mesh on a standard sieve with deionized water for 2 to 3 times, and dry it in an oven at 60°C for easy measurement. Mix 15g of dried vermiculite with 1M lithium citrate solution at a ratio of 1:7, soak in a constant temperature water bath at 80°C, and keep stirring for 1 hour, then filter out the soaking solution. The vermiculite particles were washed twice with 200 ml of deionized water, and the cleaning solution was filtered out to obtain lithiated vermiculite. Brew the lithiated vermiculite with 95-100°C hot deionized water of 30 times the mass of the vermiculite. The brewing process is firstly stirred at a constant temperature for 10 minutes, and then allowed to stand at the same temperature for 30 minutes. After standing, the water in the upper layer was filtered out. Repeat the above brewing process 5 times, and the expansion of vermiculite after each brewing is 3.65, 5.00, 5.65, 6.12,...

Embodiment 2

[0032] Other conditions were the same as in Example 1, except that the modifier solution was changed to 3M sodium chloride solution, mixed with vermiculite at a ratio of 1:2, and the temperature of the constant temperature water bath was changed to 100°C. Sodiumized vermiculite is brewed three times with hot deionized water, and its volume expansion multiple is 2.01 times.

[0033] Mix the brewed and expanded vermiculite with deionized water of 5 times the mass of vermiculite to form a weakly bonded vermiculite-water slurry between layers. Take by weighing the same mass of silicon dioxide nanoparticles as vermiculite (specific surface area 380m 2 / g of fumed silica), added to the above slurry, first stirred at a low speed of 500rpm until the nanoparticles were dispersed, and then stirred with a high-speed shear mixer at a speed of 2000rpm for 60min to obtain viscous vermiculite flakes-nano-oxidized Mixed slurry. The mixed slurry was observed under an optical microscope, and ...

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Abstract

The invention discloses a preparation method of a high-temperature oxide nano-particle spaced vermiculite micro-nano sheet, and belongs to the technical field of preparation of heat-insulating and fireproof materials. The preparation method comprises the steps of replacing interlayer ions of vermiculite by adopting a chemical modifier, and weakening interlayer binding force through hydration so as to obtain interlayer weak binding vermiculite-water slurry; dispersing high-temperature oxide nanoparticles in the vermiculite-water slurry, and adjusting the consistency of the slurry; and then under the action of high-speed shearing and stirring, separating vermiculite lamellas, and highly dispersing in the nano oxide slurry. The mixed slurry has high viscosity, and vermiculite sheets are stripped into lamellar shapes with micro-nano thickness, are separated by nano-particles and are stably suspended in the slurry. According to the method, the granularity and thickness of the vermiculite sheets can be controlled, the stripping degree is better, and the prepared vermiculite micro-nano sheet-nano oxide mixed slurry can be used as a fireproof coating for fireproof protection of inflammable building materials. The mixed slurry is dried to obtain the nano-particle spaced vermiculite micro-nano sheet which can be used for a high-temperature nano oxide powder-based super thermal insulation material of a dry process.

Description

technical field [0001] The invention relates to the technical field of preparation of heat insulation and fireproof materials, in particular to a preparation method of vermiculite micro-nano sheets spaced by high-temperature oxide nanoparticles. Background technique [0002] The high-temperature nano-oxide powder-based super thermal insulation material is prepared by mixing and forming high-melting point gas-phase oxides, infrared sunscreen agents, and reinforcing fibers through a dry process. The rubber material has more excellent thermal insulation performance. When the material mix ratio and density are optimized, the thermal conductivity-temperature curve is close to a horizontal straight line. [0003] During the compression molding process of the block material, the gas inside the material rebounds after being compressed, resulting in a decrease in the strength of the material, or even cracking. In addition to reducing the amount of gas in the raw material during the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40C01B33/12C09D5/18B82Y40/00B82Y30/00
CPCC01B33/40C01B33/12C09D5/18B82Y40/00B82Y30/00C01P2004/20C01P2004/80
Inventor 陈德平郭林芳王立佳马焱房政来晓彤赛斯
Owner UNIV OF SCI & TECH BEIJING
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