A kind of preparation method of lightweight aluminum oxide hollow sphere thermal insulation product
A technology of alumina hollow spheres and alumina micropowder, which is applied in the field of lightweight heat-insulating refractory materials, can solve the problems of high density of alumina hollow spheres, low production efficiency, large heat storage, etc., and achieve good heat insulation effect and thermal conductivity Low efficiency and small heat storage effect
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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 micropowder, 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 55oC and 70%, respectively, dried for 80h, and then transferred to a common drying oven at 90oC for 36h. The dried body is raised to 600oC at a heating rate of 2oC / min and kept for 1h, then raised to 1700oC at a rate of 2oC / ...
Embodiment 3
[0026] 4000g alumina micropowder, 720g water, 40g polycarboxylate polymer FS20, 280g acrylamide AM, 60g dipropylene tartrate diamide DATDA, 4gN,N,N',N'-tetramethylethylenediamine TEMED , put into a ball mill jar, planetary ball mill at a speed of 30r / min for 1.5h to obtain a slurry; then add 72g of sodium dodecylbenzenesulfonate to the slurry, stir and foam to obtain a foamed slurry, and finally to Add 6000g of aluminum oxide hollow balls and 120g of sodium persulfate to the foaming slurry and stir until uniform, then pour into the mold, let it stand for 18 hours, and demould. The green body after demoulding is placed in a constant temperature and humidity oven, the temperature and humidity are respectively 50oC and 80%, 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 sph...
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