CN102503482A - Low-thermal conductivity modified vermiculite composite thermal insulation material and preparation method thereof - Google Patents
Low-thermal conductivity modified vermiculite composite thermal insulation material and preparation method thereof Download PDFInfo
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- CN102503482A CN102503482A CN2011103421282A CN201110342128A CN102503482A CN 102503482 A CN102503482 A CN 102503482A CN 2011103421282 A CN2011103421282 A CN 2011103421282A CN 201110342128 A CN201110342128 A CN 201110342128A CN 102503482 A CN102503482 A CN 102503482A
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Abstract
The invention relates to a low-thermal conductivity modified vermiculite composite thermal insulation material and a preparation method thereof. According to the technical scheme, 10 to 20 milliliters of an aluminum salt solution is prepared from expanded vermiculite per gram, wherein a ratio of urea to the amount of substance of Al3<+> in the aluminum salt solution is (8-15):1, and a volume ratio of concentrated sulfuric acid to the aluminum salt solution is 1:(400-500). The method comprises the following steps of: mixing the expanded vermiculite, the urea, the concentrated sulfuric acid and the aluminum salt solution in a ratio of the raw materials, stirring at the temperature of between 80 and 100 DEG C for 18 to 32 hours, eluting, and drying to obtain modified vermiculite; and mixing 40 to 80 weight percent of modified vermiculite and 20 to 60 weight percent of forsterite which serve as the raw materials, adding an aluminum dihydrogen phosphate solution in an amount which is 10 to 20 percent of the weight of the raw materials, stirring, pressing for forming, and keeping the temperature at the temperature of between 500 and 650 DEG C for 2 to 5 hours to obtain the low-thermal conductivity modified vermiculite composite thermal insulation material. Therefore, the low-thermal conductivity modified vermiculite composite thermal insulation material has the characteristics of low coefficients of heat conductivity, high strength and wide application range.
Description
Technical field
The invention belongs to the composite heat-insulated material technical field.Be specifically related to a kind of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material and preparation method thereof.
Background technology
Development and exploitation fine insulating refractory, and reasonable supporting use in Industrial Stoves are effective energy saving ways.The fine insulating refractory both can improve the life-span of kiln, can improve quality, minimizing thermosteresis, the raising utilization efficiency of heat energy of product again and reduce energy dissipation, thereby reach the purpose of save energy, reduction product cost.Therefore, the demand to effective high temperature insulating material just more shows urgent.
Vermiculite is that the structural unit layer is dioctahedron or the trioctahedron aluminium silicate mineral that 2: 1 types, interlayers have interchangeability positively charged ion and water molecules, and interlayer charge is between 0.6～0.9; Have expandable interlamination region, the interlamination region internal adsorption has water molecules and interchangeability positively charged ion.Vermiculite is calcined to 200oC and can sharply expands when above, can be made into expanded vermiculite, and expanded vermiculite has low density (80 ~ 120kg/ m
3), the characteristics of low heat conductivity [0.04 ~ 0.12W/ (MK)] and high relatively fusing point (1240 ℃～1430 ℃); Expanded vermiculite has that aerated density is low, chemical property stable, heat insulation, sound insulation, premium properties such as antibiotic, fire-resistant and cold-resistant, has purposes widely in industries such as building, electric power, oil, chemical industry, metallurgy and weavings.
Though its goods thermal conductivity is lower when using as the expanded vermiculite filling of making the high temperature insulating material filler, intensity is also lower, and application is very limited.When using high-strength consolidating material that expanded vermiculite is bonded to finished product,, also reduced the effect of heat insulation of vermiculite simultaneously though have the intensity bigger than expanded vermiculite.The expanded vermiculite that obtains through heat modification is because bigger high temperature rate of expansion; Cause the interlayer spacing to increase, the perforation pore of interlayer causes the lagging material compressive strength to reduce, and intensity along with reducing of unit weight; And along with its thermal conductivity of rising of temperature raises rapidly; Thereby very difficult raising, particularly thermal conductivity of the use temperature that makes lagging material is still higher or vermiculite product possessive volume is bigger, and range of application is restricted.
Summary of the invention
The present invention is intended to overcome the prior art defective, and purpose provides lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material that thermal conductivity is lower under a kind of hot conditions, intensity is higher, range of application is wider and preparation method thereof.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is: the proportioning raw materials of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is: every gram expanded vermiculite is joined 10 ~ 20ml aluminum salt solution, the Al in urea and the aluminum salt solution
3+Amount of substance than for (8 ~ 15) ︰ 1, the volume ratio of the vitriol oil and aluminum salt solution is 1 ︰ (400 ~ 500).
Press earlier the above-mentioned raw materials proportioning, expanded vermiculite, urea, the vitriol oil and aluminum salt solution are mixed, stirred 18 ~ 32 hours down, obtain PERFORMANCE OF MODIFIED VERMICULITE after the wash-out drying at 80 ~ 100 ℃.
Be raw materials mix with the PERFORMANCE OF MODIFIED VERMICULITE of 40 ~ 80wt% and the forsterite of 20 ~ 60wt% again; Add the phosphate dihydrogen aluminum solution of said raw material 10 ~ 20wt%, stir compression moulding; Under 500 ~ 650oC condition, be incubated 2 ~ 5h, promptly get lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material.
The particle diameter of said expanded vermiculite is 0.05 ~ 1mm.
Said aluminum salt solution is a kind of in Tai-Ace S 150, aluminum chloride, the aluminum nitrate; The concentration of aluminum salt solution is 0.05 ~ 0.5mol/l.
The pressure of said compacting is 4 ~ 20MPa.
The concentration of said phosphate dihydrogen aluminum solution is 40 ~ 60wt%.
Owing to adopt technique scheme, the present invention utilizes the hydrothermal method modification that expanded vermiculite interlayer spacing is increased, and inlays a large amount of alumina particles at the sheet interlayer of expanded vermiculite, has reduced the thermal conductivity of expanded vermiculite.The distinctive laminated structure of expanded vermiculite has the hot-fluid reflection potential, and the expanded vermiculite interlayer hole pore volume after the modification diminishes, and the transmission of heat by convection approach is obstructed, and the heat-proof quality of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is further strengthened; The a large amount of nanometer micropores uniformly that form between the vermiculite layers after the modification simultaneously increase lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material compressive strength.Because the thermal conductivity of institute's prepared material reduces, make that the thickness of material therefor reduces under identical insulation in addition, increase so lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material can be applied to the scope at finite volume position.
The working temperature of the lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material that the present invention is prepared can be brought up to 1200oC from 800oC, and the Main physical performance after setting treatment is: volume density 1.15 ~ 1.27g/cm
3Ultimate compression strength 17.1 ~ 21.8MPa; 600 oC thermal conductivitys are 0.153 ~ 0.190 W/ (MK).Therefore, the prepared lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material of the present invention has the advantages that thermal conductivity is lower, intensity is higher and range of application is wider.
Embodiment
Below in conjunction with embodiment the present invention being done further description, is not the restriction to its protection domain.
For avoiding repetition, the technical parameter unification that this embodiment is involved earlier is described below, and repeat no more among the embodiment: the particle diameter of expanded vermiculite is 0.05 ~ 1mm; The concentration of aluminum salt solution is 0.05 ~ 0.5mol/l; The pressure of compacting is 4 ~ 20MPa; The concentration of phosphate dihydrogen aluminum solution is 40 ~ 60wt%.
Embodiment 1
A kind of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material and preparation method thereof.The proportioning raw materials of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is: every gram expanded vermiculite is joined 10 ~ 12ml aluminum salt solution, the Al in urea and the aluminum salt solution
3+Amount of substance than for (8 ~ 10) ︰ 1, the volume ratio of the vitriol oil and aluminum salt solution is 1 ︰ (400 ~ 420).
Press earlier the above-mentioned raw materials proportioning, expanded vermiculite, urea, the vitriol oil and aluminum salt solution are mixed, stirred 18 ~ 22 hours down, obtain PERFORMANCE OF MODIFIED VERMICULITE after the wash-out drying at 80 ~ 85 ℃.
Be raw materials mix with the PERFORMANCE OF MODIFIED VERMICULITE of 40 ~ 50wt% and the forsterite of 50 ~ 60wt% again; Add the phosphate dihydrogen aluminum solution of said raw material 10 ~ 12wt%, stir compression moulding; Under 500 ~ 540oC condition, be incubated 2 ~ 3h, promptly get lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material.
Aluminum salt solution in the present embodiment is an alum liquor, and concentration is 0.05 ~ 0.15mol/l.
The Main physical performance is after the prepared lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material setting treatment of this enforcement: volume density is 1.19 ~ 1.27g/cm
3Ultimate compression strength is 17.1 ~ 19.9MPa; The 600oC thermal conductivity is 0.166 ~ 0.190W/ (MK).
Embodiment 2
A kind of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material and preparation method thereof.The proportioning raw materials of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is: every gram expanded vermiculite is joined 12 ~ 15ml aluminum salt solution, the Al in urea and the aluminum salt solution
3+Amount of substance than for (10 ~ 12) ︰ 1, the volume ratio of the vitriol oil and aluminum salt solution is 1 ︰ (420 ~ 450).
Press earlier the above-mentioned raw materials proportioning, expanded vermiculite, urea, the vitriol oil and aluminum salt solution are mixed, stirred 22 ~ 26 hours down, obtain PERFORMANCE OF MODIFIED VERMICULITE after the wash-out drying at 85 ~ 90 ℃.
Be raw materials mix with the PERFORMANCE OF MODIFIED VERMICULITE of 50 ~ 60wt% and the forsterite of 40 ~ 50wt% again; Add the phosphate dihydrogen aluminum solution of said raw material 12 ~ 13wt%, stir compression moulding; Under 540 ~ 580oC condition, be incubated 3 ~ 4h, promptly get lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material.
Aluminum salt solution in the present embodiment is an alum liquor, and concentration is 0.15 ~ 0.3mol/l
The Main physical performance is after the prepared lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material setting treatment of present embodiment: volume density is 1.16 ~ 1.25g/cm
3Ultimate compression strength is 18.7 ~ 20.3MPa; The 600oC thermal conductivity is 0.153 ~ 0.182W/ (MK).
Embodiment 3
A kind of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material and preparation method thereof.The proportioning raw materials of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is: every gram expanded vermiculite is joined 15 ~ 18ml aluminum salt solution, the Al in urea and the aluminum salt solution
3+Amount of substance than for (12 ~ 14) ︰ 1, the volume ratio of the vitriol oil and aluminum salt solution is 1 ︰ (450 ~ 470).
Press earlier the above-mentioned raw materials proportioning, expanded vermiculite, urea, the vitriol oil and aluminum salt solution are mixed, stirred 26 ~ 30 hours down, obtain PERFORMANCE OF MODIFIED VERMICULITE after the wash-out drying at 90 ~ 95 ℃.
Be raw materials mix with the PERFORMANCE OF MODIFIED VERMICULITE of 60 ~ 70wt% and the forsterite of 30 ~ 40wt% again; Add the phosphate dihydrogen aluminum solution of said raw material 15 ~ 17wt%, stir compression moulding; Under 580 ~ 620oC condition, be incubated 4 ~ 5h, promptly get lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material.
Aluminum salt solution in the present embodiment is an aluminum nitrate solution, and concentration is 0.3 ~ 0.4mol/l.
The Main physical performance is after the prepared lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material setting treatment of present embodiment: volume density is 1.15 ~ 1.26g/cm
3Ultimate compression strength is 18.5 ~ 21.8MPa; The 600oC thermal conductivity is 0.168 ~ 0.190W/ (MK).
Embodiment 4
A kind of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material and preparation method thereof.The proportioning raw materials of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is: every gram expanded vermiculite is joined 18 ~ 20ml aluminum salt solution, the Al in urea and the aluminum salt solution
3+Amount of substance than for (14 ~ 15) ︰ 1, the volume ratio of the vitriol oil and aluminum salt solution is 1 ︰ (470 ~ 500).
Press earlier the above-mentioned raw materials proportioning, expanded vermiculite, urea, the vitriol oil and aluminum salt solution are mixed, stirred 28 ~ 32 hours down, obtain PERFORMANCE OF MODIFIED VERMICULITE after the wash-out drying at 95 ~ 100 ℃.
Be raw materials mix with the PERFORMANCE OF MODIFIED VERMICULITE of 70 ~ 80wt% and the forsterite of 20 ~ 30wt% again; Add the phosphate dihydrogen aluminum solution of said raw material 17 ~ 20wt%, stir compression moulding; Under 620 ~ 650oC condition, be incubated 4 ~ 5h, promptly get lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material.
Aluminum salt solution in the present embodiment is a liquor alumini chloridi, and concentration is 0.4 ~ 0.5mol/l.
The Main physical performance is after the prepared lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material setting treatment of present embodiment: volume density is 1.16 ~ 1.27g/cm
3Ultimate compression strength is 18.1 ~ 21.5MPa; The 600oC thermal conductivity is 0.160 ~ 0.188W/ (MK).
This embodiment utilizes the hydrothermal method modification that expanded vermiculite interlayer spacing is increased, and inlays a large amount of alumina particles at the sheet interlayer of expanded vermiculite, has reduced the thermal conductivity of expanded vermiculite.The distinctive laminated structure of expanded vermiculite has the hot-fluid reflection potential, and the expanded vermiculite interlayer hole pore volume after the modification diminishes, and the transmission of heat by convection approach is obstructed, and the heat-proof quality of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is further strengthened; The a large amount of nanometer micropores uniformly that form between the vermiculite layers after the modification simultaneously increase lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material compressive strength.Because the thermal conductivity of institute's prepared material reduces, make that the thickness of material therefor reduces under identical insulation in addition, increase so lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material can be applied to the scope at finite volume position.
The working temperature of the lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material that this embodiment is prepared can be brought up to 1200oC from 800oC, and the Main physical performance after setting treatment is: volume density 1.15 ~ 1.27g/cm
3Ultimate compression strength 17.1 ~ 21.8MPa; 600 oC thermal conductivitys are 0.153 ~ 0.190 W/ (MK).Therefore, the prepared lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material of this embodiment has the advantages that thermal conductivity is lower, intensity is higher and range of application is wider.
Claims (6)
1. the preparation method of a lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material, it is characterized in that the proportioning raw materials of said lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material is: every gram expanded vermiculite is joined 10 ~ 20ml aluminum salt solution, the Al in urea and the aluminum salt solution
3+Amount of substance than for (8 ~ 15) ︰ 1, the volume ratio of the vitriol oil and aluminum salt solution is 1 ︰ (400 ~ 500);
Press earlier the above-mentioned raw materials proportioning, expanded vermiculite, urea, the vitriol oil and aluminum salt solution are mixed, stirred 18 ~ 32 hours down, obtain PERFORMANCE OF MODIFIED VERMICULITE after the wash-out drying at 80 ~ 100 ℃;
Be raw materials mix with the PERFORMANCE OF MODIFIED VERMICULITE of 40 ~ 80wt% and the forsterite of 20 ~ 60wt% again; Add the phosphate dihydrogen aluminum solution of said raw material 10 ~ 20wt%, stir compression moulding; Under 500 ~ 650oC condition, be incubated 2 ~ 5h, promptly get lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material.
2. the preparation method of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material according to claim 1, the particle diameter that it is characterized in that said expanded vermiculite is 0.05 ~ 1mm.
3. the preparation method of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material according to claim 1 is characterized in that said aluminum salt solution is a kind of in Tai-Ace S 150, aluminum chloride, the aluminum nitrate; The concentration of aluminum salt solution is 0.05 ~ 0.5mol/l.
4. the preparation method of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material according to claim 1, the pressure that it is characterized in that said compacting is 4 ~ 20MPa.
5. the preparation method of lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material according to claim 1, the concentration that it is characterized in that said phosphate dihydrogen aluminum solution is 40 ~ 60wt%.
6. according to the prepared lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material of preparation method of each described lower thermal conductivity PERFORMANCE OF MODIFIED VERMICULITE composite heat-insulated material in the claim 1 ~ 5.
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Cited By (5)
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| CN104177712A (en) * | 2014-08-13 | 2014-12-03 | 安徽明都电力线缆有限公司 | Reinforced modified vermiculite for EPDM (Ethylene-Propylene-Diene Monomer) cable material and preparation method of modified vermiculite |
| CN105384453A (en) * | 2015-12-03 | 2016-03-09 | 梅庆波 | Preparation method for high temperature-resistant heat-insulating composite material |
| CN108558221A (en) * | 2018-05-30 | 2018-09-21 | 郭舒洋 | A kind of preparation method of the moisture-proof mineral wool of high thermal insulation |
| CN108793178A (en) * | 2018-07-28 | 2018-11-13 | 塔里木大学 | A method of improving expanding vermiculite performance |
| CN111848213A (en) * | 2020-07-23 | 2020-10-30 | 广州市广丰混凝土有限公司 | Heat-insulation concrete |
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| CN104177712A (en) * | 2014-08-13 | 2014-12-03 | 安徽明都电力线缆有限公司 | Reinforced modified vermiculite for EPDM (Ethylene-Propylene-Diene Monomer) cable material and preparation method of modified vermiculite |
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| CN111848213B (en) * | 2020-07-23 | 2022-09-16 | 广州市广丰混凝土有限公司 | Heat-insulation concrete |
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