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Extra-light porous thermal insulating material and method for preparing same

A thermal insulation material and ultra-light technology, applied in the field of building materials, can solve the problems of large increase in saturated water absorption rate of foam concrete, little research on the mechanism of foam concrete, affecting the use effect of foam concrete, etc. Advantages, excellent effect of bulk density

Inactive Publication Date: 2012-08-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, there are few studies on the mechanism of foam concrete, especially the relationship between the pore-forming substances, pore structure and macroscopic mechanical properties of foam concrete, which limits the promotion of foam concrete and the further improvement of its performance.
High water absorption is the Achilles' heel of foam concrete. After absorbing water, the thermal conductivity of foam concrete will increase sharply, thereby reducing its thermal insulation performance. The increase rate is very large, which is easy to cause freeze-thaw phenomenon, which seriously affects the use effect of foam concrete

Method used

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  • Extra-light porous thermal insulating material and method for preparing same
  • Extra-light porous thermal insulating material and method for preparing same

Examples

Experimental program
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Embodiment 1

[0046] 1. Preparation of cement: first grind ordinary portland cement and sulphoaluminate cement separately so that the specific surface area is 3500cm 2 / g, be 4:1 to mix homogeneously by the mass ratio of the two;

[0047] 2. Preparation of metakaolin and mixing with activator: Kaolin is calcined at 850°C, kept for 3 hours, and ground to a specific surface area of ​​3000cm 2 / g to get metakaolin. Mix the ground sodium silicate with sodium hydroxide, adjust the dosage of sodium hydroxide so that the modulus of sodium silicate is 0.85. Adding modulus to the metakaolin after calcining is sodium silicate of 0.85, mix well;

[0048] 3. Preparation of foam stabilizer: Mix hydroxypropyl methylcellulose ether with a viscosity of 100000mPa·s and cooked gum arabic powder at a mass ratio of 1: 2 to make a solution to obtain a foam stabilizer;

[0049] 4. Preparation of anti-cracking agent: Mix polypropylene fibers with a length of 3 mm and ceramic fibers of 5 mm in a mass ratio of 3...

Embodiment 2

[0057] 1. Preparation of cement: Grind ordinary Portland cement and sulphoaluminate cement separately to make the specific surface area 3200cm 2 / g, be 4.5:1 mix homogeneously by the mass ratio of both;

[0058] 2. Preparation of metakaolin and mixing with activator: Kaolin is calcined at 850°C, kept for 3 hours, and ground to a specific surface area of ​​3500cm 2 / g to get metakaolin. Mix the ground sodium silicate with sodium hydroxide, adjust the dosage of sodium hydroxide so that the modulus of sodium silicate is 1.0. Add sodium silicate with a modulus of 1.0 to the calcined metakaolin, and mix well;

[0059] 3. Preparation of foam stabilizer: Mix hydroxypropyl methylcellulose ether with a viscosity of 50000mPa·s and cooked gum powder in a mass ratio of 1:2 to make a solution;

[0060] 4. Preparation of anti-cracking agent: mix 3mm long polypropylene fiber and 5mm ceramic fiber according to the mass ratio of 2:1.

[0061] 5. Preparation of ultra-light porous thermal in...

Embodiment 3

[0065] 1. Preparation of cement: Grind ordinary portland cement and sulphoaluminate cement separately to make the specific surface area 3200cm 2 / g, be 4:1 to mix homogeneously by the mass ratio of the two;

[0066] 2. Preparation of metakaolin and mixing with activator: Kaolin is calcined at 850°C, kept for 3 hours, and ground to a specific surface area of ​​3300cm 2 / g. Mix the ground sodium silicate with sodium hydroxide, adjust the dosage of sodium hydroxide so that the modulus of sodium silicate is 0.80. Add sodium silicate with a modulus of 0.80 in the calcined metakaolin, and mix evenly;

[0067] 3. Preparation of foam stabilizer: Mix hydroxypropyl methylcellulose ether with a viscosity of 200000mPa·s and cooked gum powder in a mass ratio of 1:3 to make a solution;

[0068] 4. Preparation of anti-cracking agent: Mix 3mm-long polypropylene fiber and 5mm ceramic fiber evenly at a mass ratio of 3.5:1.

[0069] 5. Preparation of ultra-light porous thermal insulation mat...

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Abstract

The invention relates to an extra-light porous thermal insulating material and a method for preparing the same. The extra-light porous thermal insulating material is prepared from the following components by mass percent through mixing: 65-80% of cement, 5-25% of metakaolin, 5-15% of micro-silica, 3-6% of foamer, 0.5-2% of foam stabilizer, 0.2-0.6% of antimitotic agent and 0.5-2% of excitant. The method for preparing the extra-light porous thermal insulating material comprises the steps of: pretreating the cement, preparing the metakaolin, preparing the foam stabilizer, preparing the antimitotic agent, preparing the excitant and preparing the thermal insulating material. The method provided by the invention is significant in improving the thermal insulation property, fireproofing property, safety and durability of a building; and simultaneously, the provided thermal insulating material has the advantages of low dry density, low coefficient of heat conductivity and high strength.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an ultra-light porous thermal insulation material and a preparation method thereof. Background technique [0002] Foamed concrete is a porous and ultra-light thermal insulation material made of calcareous and siliceous materials, mixed with suitable foaming agents, etc., after batching, stirring, pouring, gas generation, and cutting. It contains a large number of small and closed circular pores. , which endows foamed concrete with good thermal performance. Foam concrete can greatly reduce the weight of buildings, and buildings using foam concrete have higher seismic performance than ordinary buildings. [0003] At present, the most widely used form of foam concrete in walls in my country is as foam concrete blocks, with a density level of 500kg / m 3 -1200kg / m 3 within range. In the actual application process, the more foam introduced into the foam concrete, the gr...

Claims

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Application Information

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IPC IPC(8): C04B38/02
Inventor 马保国苏雷蹇守卫赵志广刘敏
Owner WUHAN UNIV OF TECH
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