Method for preparing lightweight alumina hollow sphere heat insulation product

A technology of alumina hollow spheres and hollow spheres, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of high density of alumina hollow spheres, low production efficiency, large heat storage, etc., and achieve good heat insulation effect , low thermal conductivity, small heat storage effect

Active Publication Date: 2014-12-10
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature environment of the firing and working process makes the matrix part sintered and densified, which leads to a higher density of alumina hollow ball products (usually 1600㎏ / m 3 Around, 1200 oC thermal conductivity 2.0 W m -1 ·K -1 around), through literature search, no density less than 1000kg / m was found 3 Aluminum oxide hollow sphere products
The high density makes the alumina hollow sphere products have high thermal conductivity, large heat storage, and slow heating and cooling rates, resulting in high energy consumption and low production efficiency in the high-temperature kiln industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 5000g of alumina micropowder, 750g of water, 100g of sodium hexametaphosphate, 250g of acrylamide AM, 50g of methylenebisacrylamide MBAM, and 2.5g of N,N,N',N'-tetramethylethylenediamine TEMED into a ball mill jar , planetary ball milling at a speed of 20r / min for 0.5h to obtain a slurry; then add 50g of sodium lauryl sulfate to the slurry, stir and foam to obtain a foamed slurry, and finally add 5000g of sodium lauryl sulfate to the foamed slurry Aluminum hollow spheres and 50g of ammonium persulfate were stirred until uniform, then poured into the mold, left to stand for 12 hours, and demolded. The green body after demoulding is placed in a constant temperature and humidity oven, the temperature and humidity are respectively 40oC and 60%, dried for 60h, and then transferred to an ordinary drying oven at 80oC for 48h. The dried green body is raised to 450oC at a heating rate of 1oC / min and kept for 0.5h, then raised to 1600oC at a rate of 1oC / min and held at 6h to ...

Embodiment 2

[0024] 4500g of alumina fine powder, 765g of water, 67.5g of polyethylene glycol-based polymer FS10, 135g of methacrylamide MAM, 22.5g of dipropylene tartrate diamide DATDA, 6.75g of N,N,N',N'-tetramethyl ethylenediamine TEMED was put into a ball mill jar, and planetary ball milled at a speed of 40r / min for 1h to obtain a slurry; then 67.5g ammonium lauryl sulfate was added to the slurry, stirred and foamed to obtain a foamed slurry, Finally, 5500g of aluminum oxide hollow balls and 22.5g of potassium persulfate were added to the foaming slurry and stirred until uniform, then poured into the mold, left to stand for 16 hours, and demolded. The green body after demoulding is placed in a constant temperature and humidity oven, the temperature and humidity are respectively 55oC and 70%, dried for 80h, and then transferred to a common drying oven at 90oC for 36h. The dried green body is raised to 600oC at a heating rate of 2oC / min and kept for 1 hour, then raised to 1700oC at a rat...

Embodiment 3

[0026] 4000g alumina micropowder, 720g water, 40g polycarboxylate polymer FS20, 280g acrylamide AM, 60 g dipropylene tartrate diamide DATDA, 4gN,N,N',N'-tetramethylethylenediamine TEMED was put into a ball mill jar, and planetary ball milled at a speed of 30r / min for 1.5h to obtain a slurry; then 72g sodium dodecylbenzenesulfonate was added to the slurry, stirred and foamed to obtain a foamed slurry, and finally Add 6000g aluminum oxide hollow spheres and 120g sodium persulfate to the foaming slurry, stir until uniform, pour into the mold, let stand for 18h, and demould. The green body after demoulding is placed in a constant temperature and humidity oven, the temperature and humidity are 50oC and 80%, respectively, dried for 96h, and then transferred to a common drying oven at 100oC for 40h. The dried green body was raised to 650oC at a heating rate of 1.5oC / min and kept for 0.8h, then raised to 1680oC at a rate of 1.5oC / min and held at 5h to obtain an alumina hollow sphere i...

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Abstract

The invention relates to a method for preparing a lightweight alumina hollow sphere heat insulation product. The method comprises the following steps: by taking an alumina hollow sphere as aggregate and alumina micro powder as a matrix, adding water and a foaming agent into the alumina micro powder, mixing and foaming, introducing pores into the hollow sphere brick matrix, thereby obtaining a porous matrix; carrying out a polymerization reaction between an organic monomer and a crosslinking agent in a foaming slurry under the actions of an initiator and a catalyst, curing the foaming slurry, standing and demolding, thereby obtaining a blank consisting of the porous matrix and the hollow sphere aggregate; and drying and sintering the blank, thereby obtaining the lightweight alumina hollow sphere heat insulation brick. The hollow sphere heat insulation product prepared by the invention has low density of 600-1000kg/mg<3> and low heat conductivity of 0.36-0.83W.m<-1>.K<-1> and is good in heat insulation effect, low in heat storage and obvious in energy-saving effect.

Description

technical field [0001] The invention relates to a method for preparing a light-weight aluminum oxide hollow sphere heat-insulating product, and belongs to the field of light-weight heat-insulating refractory materials. technical background [0002] Energy saving and consumption reduction has become the direction of the joint efforts of the whole society. The use of heat-insulating refractory materials is one of the important measures for the kiln industry to achieve energy saving and consumption reduction. With the rapid development of my country's economy, the contradiction of energy shortage has become increasingly prominent, which puts forward higher requirements for the energy-saving effect of heat-insulating refractory materials. [0003] Among many light-weight heat-insulating refractory materials, alumina hollow sphere products have the advantages of high service temperature, excellent refractory performance, and high thermal shock stability, and are widely used in hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/66
Inventor 陈阔袁波王刚韩建燊董宾宾
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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