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Cement-based lightweight porous heat insulating material and preparation method thereof

A thermal insulation material, cement-based technology, applied in the field of building materials, can solve the problems of limited application effect and scope, durability problems, and inability to replace polystyrene foam materials.

Inactive Publication Date: 2012-02-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN1887772A proposes a kind of dry density 300kg / m 3 The above foam concrete is prepared from sulphoaluminate cement, which has high density and high cost. Moreover, there are durability problems, and the application effect and scope are severely limited; Chinese patent CN101973779A proposes a preparation process for a new type of foam concrete. The grade is 700-1200kg / m 3 , the density is too high, and the thermal insulation performance is poor, so it can only be used in filling engineering occasions, and cannot replace polystyrene foam materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Cement slurry preparation: PO42.5 cement 300g, water 160g, polycarboxylate superplasticizer (Jiangsu Bote New Material Co., Ltd.) 7.0g, NJFA foam stabilizer 0.6g, early strength agent (CaCl 2 ) 3.0g, fiber (wooden fiber) 1.2g, latex powder 0.8g, water repellent (calcium stearate) 0.5g, add to the mixer in turn, and stir at a medium speed (800rpm) for 4min to make a uniform distribution of various components Grout;

[0021] 2) Foaming agent mixing: 9.0 g of foaming agent (hydrogen peroxide solution with a mass concentration of 35%) was added to the above cement slurry, and stirred at high speed (2200 rpm) for 1 min to prepare foaming agent-containing cement slurry with uniform foaming agent distribution;

[0022] 3) Pouring of the porous body: pouring the prepared cement slurry containing foaming agent into the pre-prepared mold;

[0023] 4) Static foaming: keep the mold in a static state, and the slurry in the mold will foam naturally;

[0024] 5) Curing with mold:...

Embodiment 2

[0028] 1) Cement slurry preparation: PII52.5 cement 300g, water 140g, polycarboxylate superplasticizer (Jiangsu Bote New Material Co., Ltd.) 1.5g, NJFA foam stabilizer 4.5g, early strength agent (water glass) 7.5g, Add 3.5g of fiber (chemical synthetic fiber), 8.0g of latex powder, and 8.0g of water repellent (aluminum stearate) to the mixer in sequence, and stir for 3 minutes at a medium speed (1200rpm) to make a cement slurry with uniform distribution of various components;

[0029] 2) Foaming agent mixing: 18 g of foaming agent (hydrogen peroxide solution with a mass concentration of 30%) was added to the above cement slurry, and stirred at high speed (2500 rpm) for 3 minutes to make cement slurry containing foaming agent with uniform distribution of foaming agent;

[0030] 3) Pouring of the porous body: pouring the prepared cement slurry containing foaming agent into the pre-prepared mold;

[0031] 4) Static foaming: keep the mold in a static state, and the slurry in the m...

Embodiment 3

[0036] 1) Cement slurry preparation: PO42.5 cement 300g, water 135g, naphthalene-based water reducer (Jiangsu Bote New Material Co., Ltd.) 3.6g, NJFA foam stabilizer 9.0g, early strength agent (aluminum sulfate) 12g, fiber ( Chemical synthetic fiber) 4.5g, latex powder 15g, water repellent (organosilicon) 18g, add into the mixer in turn, and stir at a medium speed (1500rpm) for 2min to make cement slurry with uniform distribution of various components;

[0037] 2) Foaming agent mixing: Add 24 g of foaming agent (10% hydrogen peroxide in mass concentration) to the cement slurry, and stir at high speed (2800 rpm) for 1 min to prepare foaming agent-containing cement slurry with uniform foaming agent distribution;

[0038] 3) Pouring of the porous body: pouring the prepared cement slurry containing foaming agent into the pre-prepared mold;

[0039] 4) Static foaming: keep the mold in a static state, and the slurry in the mold will foam naturally;

[0040] 5) Curing with mold: The p...

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Abstract

The invention relates to a cement-based lightweight porous heat insulating material and a preparation method thereof. The material is prepared from portland cement or ordinary portland cement, water reducing agent, foam stabilizer, early strength agent, fiber, emulsion powder, water repellent, foaming agent and water according to a certain ratio. The weight ratio of cement, water reducing agent, foam stabilizer, early strength agent, fiber, emulsion powder, water repellent and foaming agent is 100:0.2-2.4:(0.1-3.)0:(1.0-4.0):(0.3-1.5):(0.1-5.0):(0.1-6.0):(3.0-8.0); and the water cement ratio is 0.45-0.55. The dry density of the LWFC material is 250-300kg / m<3>, the compressive strength is 0.5-1.0MPa, the heat conduction coefficient is 0.05-0.08W / m.k, the water absorption rate is 4-8%; the material can not deform and crack, is used as an inorganic incombustible lightweight heat insulating material and can replace the organic combustible heat insulating material represented by polystyrene foam; and the material can be used in the external wall exterior insulation construction of the building energy-efficient project and can also be used in the roof insulation project, the floor heating project or the occasions for preparing the composite heat insulating board and the like.

Description

technical field [0001] The invention relates to a cement-based lightweight porous thermal insulation material (hereinafter referred to as "LWFC") and a preparation method thereof, in particular to a cement-based lightweight porous insulation material with a density of 250-300kg / m 3 The invention relates to the mix ratio design and preparation method of the cement-based non-combustible lightweight porous thermal insulation material, belonging to the technical field of building materials. Background technique [0002] With the deepening of global energy and resource shortages and environmental pollution, saving energy and resources has become the only way for global economic development. The Chinese government has also publicly stated many times on various official occasions that energy conservation, emission reduction and sustainable development should be regarded as the basic national policy of China's economic development. According to reports, the energy consumption of ho...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/02
Inventor 潘志华吕钦刚秦璜
Owner NANJING UNIV OF TECH
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