Expansive pearlite-hard cilicon calcium stone composite thermal insulating material and preparing process thereof

A technology of composite thermal insulation material and expanded perlite, which is applied in thermal insulation, building components and other directions, can solve the problems of decreased high temperature resistance, and achieve the effect of improving flexural strength and compressive strength

Inactive Publication Date: 2005-01-05
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

The use of the above two bonding materials will also grea

Method used

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Experimental program
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Effect test

Embodiment 1

[0029] Preparation of xonotlite active slurry

[0030] The quartz powder used is the natural quartz powder produced naturally and after simple water selection, the trade name is "powder quartz", the particle size is 0-40μm, SiO 2 The content is 99.1Wt.%, the main chemical components of the lime used are: CaO97.5Wt.%, MgO1.2Wt.%, SiO 2 0.4Wt.%, Al 2 o 3 0.4Wt.%, Fe 2 o 3 0.5 wt.%. Lime is digested with warm water at 50°C and passed through 100-mesh and 200-mesh sieves for use as ingredients.

[0031] Emulsify the above "powder quartz" with lime to CaO / SiO 2 The proportion is 1.05 for batching, and the amount of water is added to the ratio of water / (quartz powder+lime) is 20, as the mixed slurry before the reaction. The above-mentioned mixed slurry is put into an autoclave with a stirring device and sealed, and then the high temperature and high pressure hydrothermal dynamic reaction is carried out. The temperature rise in the reactor should be completed within 1.8 ho...

Embodiment 2

[0036] Preparation of xonotlite active slurry

[0037] Used quartz powder is the same as embodiment 1, particle size 0~40 μ m, SiO 2 The content is 98.5Wt.%, the main chemical components of the lime used are: CaO89.3 Wt.%, MgO3.4Wt.%, SiO 2 5.2Wt.%, Al 2 o 3 1.3Wt.%, Fe 2 o 3 0.8 wt.%. Lime is digested with warm water at 50°C and passed through 100-mesh and 200-mesh sieves for use as ingredients.

[0038] The above "powder quartz" and milk of lime are mixed with CaO / SiO 2 The proportion is 1.03 for batching, and the amount of water is added to the ratio of water / (quartz powder+lime) is 20, as the mixed slurry before the reaction. The above-mentioned mixed slurry is put into an autoclave with a stirring device and sealed, and then the high temperature and high pressure hydrothermal dynamic reaction is carried out. The temperature rise in the reactor was completed within 1.5 hours, and the temperature was raised to 220° C. for another 2 hours, and then the heat source...

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Abstract

The invention is an expanded perlite-xonotlite compound heat-preserving material and its preparing method, and its characteristic: selecting expanded perlite with loose bulk weight of 60-100 kg/cu m, mixing in xonotlite active slurry, where the mixing proportion: expanded perlite 74-85 Wt.% and dry xonotlite active slurry 14-25 Wt.%, additionally adding in 1.0 Wt.% alkali resistant glass fiber as reinforcing fiber. After mixed material is stirred uniformly, making pressure filter forming in a water filtering mould; as pressing, the pressure is controlled at 0.10-0.15 MPa, and the wet blank is placed in a drying kiln for drying, and the temperature of the drying kiln is controlled at 50-110 deg.C, and the water content in the product <=1.0%, and the water content after absorbing moisture <=4.0%. The product at 800 deg.C heat conductivity coefficient is reduced by near 30% as compared with that of traditional water glass combined expanded perlite product, the folding strength and pressive strength are increased by twice above, the use temperature increased by near 200 deg.C, and the preparation cost is near that of traditional expanded perlite product.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, in particular to an expanded perlite-xonotlite composite thermal insulation material. Background technique [0002] Expanded perlite products are one of the most widely used inorganic thermal insulation materials due to their low price, fire resistance, corrosion resistance, no release of harmful substances during use, and easy harmless disposal during dismantling. The raw material of expanded perlite is obtained from natural perlite ore which is rapidly heated at 850°C to 1050°C to make it expand. The pore size inside the expanded perlite particles is mostly below 50μm, and the bulk density of the expanded particles is generally less than 150kg / m 3 , The porosity is above 90%. Therefore, the expanded perlite particles themselves have a low thermal conductivity no matter at room temperature or at high temperature. However, the current expanded perlite insulation products (plates, pi...

Claims

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Application Information

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IPC IPC(8): C04B14/06C04B14/18C04B14/30C04B14/42C04B28/18E04B1/76
CPCC04B28/188
Inventor 倪文牛福生李建平徐丽
Owner UNIV OF SCI & TECH BEIJING
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