Water-proof inflammable coal ash/metakaolin-based insulation board

A technology of metakaolin and fly ash, which is applied in the field of production of fly ash/metakaolin-based insulation boards, can solve the problems of continuous process production of limited materials, increase of production cost, long demoulding time, etc., and achieve hydration reaction Efficiency improvement, cost saving, good thermal insulation coefficient effect

Inactive Publication Date: 2017-05-31
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal insulation material prepared by this method has a long demoulding time due to the long hydration and coagulation time of the geopolymer, which limits the continuous process production of the material and increases the production cost; at the same time, the slurry does not contain a waterproofing agent, contains Alkaline water glass that stimulates slag and fly ash has hidden dangers of efflorescence and moisture absorption

Method used

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  • Water-proof inflammable coal ash/metakaolin-based insulation board
  • Water-proof inflammable coal ash/metakaolin-based insulation board
  • Water-proof inflammable coal ash/metakaolin-based insulation board

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preparation example Construction

[0041] In step 1) of the preparation method according to the present invention, since the cost of metakaolin is relatively high, and the cost of fly ash is low, the strength is poor when used alone. Therefore, in the present invention, metakaolin and fly ash are used in combination as Insulation board aggregate. Uncalcined kaolin has low activity, and the material prepared after mixing with alkali stimulant has poor strength and other properties, and cannot be used in actual applications. Therefore, the metakaolin in the present invention is calcining the kaolin at a certain temperature for a period of time to improve the activity of the kaolin, thereby obtaining a metakaolin with higher activity. In step 1), in order to ensure the higher activity of the aggregate, the kaolin is calcined at a temperature of 600°C to 900°C for 1h to 5h. The fly ash is obtained directly from the power plant without calcination.

[0042] The geopolymer aggregate can be selected from one or a mixtu...

Embodiment 1

[0048] Weigh 12.1584g of sodium silicate water glass solution in a plastic flask, weigh 2.4650g of sodium hydroxide into 4.7176g of water and stir to dissolve, then add it to sodium silicate water glass and mix evenly to obtain an alkali activator. Set aside. Weigh 3.4680g fly ash and 8.0920g metakaolin (3:7) as aggregates, weigh 0.2312g aluminum powder as blowing agent, 0.6990g calcium sulfate as reinforcing agent, and weigh 0.4626g glass fiber as toughening agent , 0.5020g sodium methyl silicate as a waterproofing agent, weigh 0.0115g calcium stearate as a foam stabilizer, 0.4200g alumina as a coagulant, and mix and stir the above dry powder evenly. Then the alkali stimulator is added to the aggregate, and the mixture is stirred rapidly for 30 seconds at a speed of 3000 rpm. Continue to stir to get a viscous slurry, let it stand at room temperature for 20 minutes, until the aggregate and the alkali stimulant fully contact and react.

[0049] Weigh 2.4000g of EVA emulsion and ...

Embodiment 2

[0051] Weigh 12.1584g of sodium silicate water glass solution in a plastic flask, weigh 2.4650g of sodium hydroxide into 4.7176g of water and stir to dissolve, then add it to sodium silicate water glass and mix evenly to obtain an alkali activator. Set aside. Weigh 4.6240g fly ash and 6.9360g metakaolin (4:6) as aggregates, weigh 0.2312g aluminum powder as foaming agent, 0.6990g calcium sulfate as reinforcing agent, and weigh 0.4626g glass fiber as toughening agent , 0.5020g sodium methyl silicate as a waterproofing agent, weigh 0.0115g calcium stearate as a foam stabilizer, 0.4200g alumina as a coagulant, and mix and stir the above dry powder evenly. Then the alkali stimulator is added to the aggregate, and the mixture is stirred rapidly for 30 seconds at a speed of 3000 rpm. Continue to stir to get a viscous slurry, let it stand at room temperature for 20 minutes, until the aggregate and the alkali stimulant fully contact and react.

[0052] Weigh 2.4000g of EVA emulsion and ...

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Abstract

The invention belongs to the field of building heat-insulating materials, and particularly relates to a production method for a water-proof inflammable coal ash/metakaolin-based insulation board. According to the preparation method, aggregate is metakaolin and coal ash, and polymerization is performed under the activation of an alkali activator, so that the hydration reaction efficiency of a geopolymer is increased greatly; a foaming agent is aluminum powder, so that the decomposing rate and foam producing amount are increased greatly in an alkaline environment, cost is lowered, and high economic efficiency is achieved. A selected polystyrene material has high density, high heat-insulation efficiency and a good waterproof effect. Moreover, reaction conditions are relatively mild, a reaction is easy to control, operation is easy, and the whole process flow meets the requirement of environmentally-friendly production. The prepared heat-insulating material has the advantages of light weight, high strength, good heat-insulation effect, superior waterproofness and inflammability.

Description

Technical field [0001] The invention belongs to the field of building thermal insulation materials, and specifically relates to a production method of a waterproof and non-combustible fly ash / metakaolin-based thermal insulation board. Background technique [0002] In recent years, a large number of infrastructure and construction projects have emerged across the country. Objectively, my country's construction industry is required to keep up with the pace of technology, continuously improve, and leap towards high efficiency, high performance, and sustainable development. However, in the production process of traditional cement, resources and energy consumption are large, and the strength is also low. The cement industry consumes a large amount of limited and non-renewable energy and mineral resources, which brings about the bottleneck problem of energy and resource shortage, and low strength and serious environmental pollution are the significant shortcomings of traditional cement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B38/02C04B28/00C04B18/08C04B18/02C04B16/08C04B20/10C04B111/27
CPCC04B16/08C04B18/023C04B18/08C04B20/1033C04B28/006C04B38/02C04B38/08C04B2111/27C04B2201/32C04B2201/50C04B38/0067C04B22/08C04B22/062C04B22/04C04B22/143C04B14/42C04B24/42C04B24/085C04B22/06Y02P40/10Y02W30/91
Inventor 姜义军景治娇林克萌苏华雷牟新东
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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