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A kind of preparation method of high temperature oxide nano-particles spaced vermiculite micro-nano sheets

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: 2022-07-15
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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  • A kind of preparation method of high temperature oxide nano-particles spaced vermiculite micro-nano sheets
  • A kind of preparation method of high temperature oxide nano-particles spaced vermiculite micro-nano sheets

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preparation example Construction

[0023] The invention provides a preparation method of high-temperature oxide nano-particles spaced vermiculite micro-nano sheets, and the process flow is as follows figure 1 shown. The raw vermiculite ore with the content of impurities such as quartz and clay in the raw materials is less than 0.5%, and the particle size is below 10 mesh of standard sieve. After washing with deionized water for 1 to 3 times, centrifuge or vacuum dehydration for use. In the vermiculite 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. Select Ca that can separate the vermiculite layers 2+ , Mg 2+ , Fe 2+ Soluble Li salts or Na salts are used as chemical modifiers, such as lithium citrate, sodium citrate, lithium EDTA, sodium EDTA, lithium ammonium triacetate, sodium ammonium triacetate, Lithium chloride, sodium chloride, sodium carbonate, etc. Using chemi...

Embodiment 1

[0029] The natural vermiculite ore with a particle size between 20 mesh and 40 mesh of a standard sieve is washed with deionized water for 2 to 3 times, and dried at 60°C in an oven for easy measurement. Mix 15g of dried vermiculite with 1M lithium citrate solution in a ratio of 1:7, soak in a constant temperature water bath at 80°C, and keep stirring for 1 h, and then filter out the soaking liquid. The vermiculite particles were washed twice with 200 ml of deionized water, and the cleaning solution was filtered out to obtain lithiated vermiculite. The lithiated vermiculite was brewed with hot deionized water at 95-100°C of 30 times the mass of vermiculite. The brewing process was first 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. The above brewing process was repeated 5 times, and the expansion amount of the vermiculite after each brewing was ...

Embodiment 2

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

[0033] The brewed and expanded vermiculite is mixed with deionized water with a mass of 5 times the vermiculite to form a weakly bound vermiculite-water slurry between layers. Weigh the same mass of silica nanoparticles as vermiculite (specific surface area 380m 2 / g fumed silica), add in the above-mentioned slurry, firstly stir at a low speed of 500rpm until the nanoparticles are dispersed, and then use a high-speed shear mixer to stir for 60min at a rotating speed of 2000rpm to obtain a viscous vermiculite flake-nano oxide Mixture slurry. The mixed slurry was observed under an optical micro...

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Abstract

The invention discloses a preparation method of vermiculite micro-nano sheets separated by high-temperature oxide nanoparticles, belonging to the technical field of thermal insulation and fireproof material preparation. In the invention, chemical modifiers are used to replace the ions between the vermiculite layers, and the interlayer bonding force is weakened by hydration to obtain a vermiculite-water slurry with weak interlayer bonding; high-temperature oxide nanoparticles are used to disperse in the vermiculite-water slurry. and adjust the consistency of the slurry; then through high-speed shearing and stirring, the vermiculite flakes are separated and highly dispersed in the nano-oxide slurry. The mixed slurry has high viscosity, and the vermiculite flakes are exfoliated into micro- and nano-thick lamellae, separated by nanoparticles, and stably suspended in the slurry. The method can control the particle size and thickness of the vermiculite flakes, and the peeling degree is better, and the prepared mixed slurry of vermiculite micro-nano flakes-nano oxide can be used as a fireproof coating for fire protection of flammable building materials. The nano-particle-spaced vermiculite micro-nano sheets obtained after the mixed slurry is dried can be used as a high-temperature nano-oxide powder-based super-insulation material in a dry process.

Description

technical field [0001] The invention relates to the technical field of preparation of heat-insulating and fire-proof materials, in particular to a preparation method of high-temperature oxide nano-particle-spaced vermiculite micro-nano sheets. Background technique [0002] The high-temperature nano-oxide powder-based super-insulation material prepared by mixing high-melting fumed oxides with infrared sunscreens and reinforcing fibers through a dry process and molding, has a specific moisture content at high temperatures above 500 °C. Adhesive 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] In the process of pressing and forming of block materials, the gas inside the material is compressed and rebounded, resulting in a reduction in the strength of the material and even cracking. In addition to reducing the amount of g...

Claims

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Application Information

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Patent Type & Authority Patents(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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