Low-thermal conductivity modified vermiculite composite thermal insulation material and preparation method thereof
A technology of low thermal conductivity and thermal insulation materials, which is applied in the field of composite thermal insulation materials, can solve the problems of reduced compressive strength of thermal insulation materials, increased interlayer spacing, and increased thermal conductivity, and achieves increased compressive strength, insulation Enhanced thermal performance, low thermal conductivity effect
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Embodiment 1
[0018] A low thermal conductivity modified vermiculite composite heat insulating material and a preparation method thereof. The raw material ratio of the low thermal conductivity modified vermiculite composite insulation material is: 10~12ml of aluminum salt solution per gram of expanded vermiculite, urea and Al in the aluminum salt solution 3+ The molar ratio of the substance is (8~10)︰1, and the volume ratio of concentrated sulfuric acid and aluminum salt solution is 1︰(400~420).
[0019] According to the above raw material ratio, mix expanded vermiculite, urea, concentrated sulfuric acid and aluminum salt solution, stir at 80-85°C for 18-22 hours, elute and dry to obtain modified vermiculite.
[0020] Then mix 40~50wt% modified vermiculite and 50~60wt% forsterite as raw materials, add 10~12wt% aluminum dihydrogen phosphate solution of the raw materials, stir, press and form, and keep warm at 500~540oC After 2~3h, the low thermal conductivity modified vermiculite composite ...
Embodiment 2
[0024] A low thermal conductivity modified vermiculite composite heat insulating material and a preparation method thereof. The raw material ratio of the low thermal conductivity modified vermiculite composite insulation material is: 12~15ml of aluminum salt solution per gram of expanded vermiculite, urea and Al in the aluminum salt solution 3+ The molar ratio of the substance is (10~12)︰1, and the volume ratio of concentrated sulfuric acid and aluminum salt solution is 1︰(420~450).
[0025] According to the above raw material ratio, mix expanded vermiculite, urea, concentrated sulfuric acid and aluminum salt solution, stir at 85-90°C for 22-26 hours, elute and dry to obtain modified vermiculite.
[0026] Then mix 50~60wt% modified vermiculite and 40~50wt% forsterite as raw materials, add 12~13wt% aluminum dihydrogen phosphate solution of the raw materials, stir, press and form, and keep warm at 540~580oC After 3~4h, the low thermal conductivity modified vermiculite composite...
Embodiment 3
[0030] A low thermal conductivity modified vermiculite composite heat insulating material and a preparation method thereof. The raw material ratio of the low thermal conductivity modified vermiculite composite insulation material is: 15~18ml of aluminum salt solution per gram of expanded vermiculite, urea and Al in the aluminum salt solution 3+ The molar ratio of the substance is (12~14)︰1, and the volume ratio of concentrated sulfuric acid and aluminum salt solution is 1︰(450~470).
[0031] According to the above raw material ratio, mix expanded vermiculite, urea, concentrated sulfuric acid and aluminum salt solution, stir at 90-95°C for 26-30 hours, elute and dry to obtain modified vermiculite.
[0032] Then mix 60~70wt% modified vermiculite and 30~40wt% forsterite as raw materials, add 15~17wt% aluminum dihydrogen phosphate solution of the raw materials, stir, press and form, and keep warm at 580~620oC After 4~5h, the low thermal conductivity modified vermiculite composite...
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