CN1559954A - Expansive pearlite-hard cilicon calcium stone composite thermal insulating material and preparing process thereof - Google Patents
Expansive pearlite-hard cilicon calcium stone composite thermal insulating material and preparing process thereof Download PDFInfo
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- CN1559954A CN1559954A CNA2004100063030A CN200410006303A CN1559954A CN 1559954 A CN1559954 A CN 1559954A CN A2004100063030 A CNA2004100063030 A CN A2004100063030A CN 200410006303 A CN200410006303 A CN 200410006303A CN 1559954 A CN1559954 A CN 1559954A
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- xonotlite
- pearlstone
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/18—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type
- C04B28/186—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type containing formed Ca-silicates before the final hardening step
- C04B28/188—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type containing formed Ca-silicates before the final hardening step the Ca-silicates being present in the starting mixture
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention is an expanded perlite-xonotlite compound heat-preserving material and its preparing method, and its characteristic: selecting expanded perlite with loose bulk weight of 60-100 kg/cu m, mixing in xonotlite active slurry, where the mixing proportion: expanded perlite 74-85 Wt.% and dry xonotlite active slurry 14-25 Wt.%, additionally adding in 1.0 Wt.% alkali resistant glass fiber as reinforcing fiber. After mixed material is stirred uniformly, making pressure filter forming in a water filtering mould; as pressing, the pressure is controlled at 0.10-0.15 MPa, and the wet blank is placed in a drying kiln for drying, and the temperature of the drying kiln is controlled at 50-110 deg.C, and the water content in the product <=1.0%, and the water content after absorbing moisture <=4.0%. The product at 800 deg.C heat conductivity coefficient is reduced by near 30% as compared with that of traditional water glass combined expanded perlite product, the folding strength and pressive strength are increased by twice above, the use temperature increased by near 200 deg.C, and the preparation cost is near that of traditional expanded perlite product.
Description
Technical field
The invention belongs to field of heat insulating materials, particularly a kind of pearlstone-xonotlite compound insulating material.
Background technology
Expanded perlite product is because cheap, has again that unharmful substance discharges in fire-resistant, anticorrosive and the use, is easy to characteristics such as harmless treatment when removing, thereby be one of inanimate matter lagging material of domestic usage quantity maximum.The pearlstone raw material is to be made it produce expanded and obtain through 850 ℃~1050 ℃ heat fast by the natural peral rock and ore.Below 50 μ m, the volume density of expanded particle itself is generally less than 150kg/m to the pore dimension of expanded perlite granule inside mostly
3, void content is more than 90%.Therefore expanded perlite granule itself is at normal temperature or at high temperature lower thermal conductivity to be arranged all.As matrix material expanded perlite granule is combined with cement or water glass but present expansion pearlite thermal insulation product (sheet material, shell or other shape material) is many.If with cement be matrix material then cement be full of millimeter grade hole crack between the particle, the volume density of goods is increased considerably, aggravated the solid thermal conduction, the thermal conductivity of goods is increased.If use water glass as matrix material, though the volume density of goods may be very low, goods also have lower thermal conductivity at normal temperatures, but because the pore dimension between the goods endoparticle is bigger, therefore the rising of the thermal conductivity of this goods is very fast under the condition of high temperature, thereby the heat-insulating property of material is reduced greatly.Use above-mentioned two kinds of matrix materials that the high thermal resistance of goods is descended significantly.
Summary of the invention
The present invention adopts the active slip of xonotlite as matrix material, makes pearlstone-xonotlite compound insulating material, than traditional expanded perlite product by a relatively large margin raising is arranged all at aspects such as thermal conductivity, intensity and high thermal resistancies.
Principle of the present invention:
The active slip of xonotlite is the intermediates of producing in the xonotlite type calcium-silicate thermal insulation material process.The control production process makes the active slip of xonotlite be made up of water, xonotlite secondary grain and colloid three parts, and the main component of the active slip of xonotlite is an xonotlite secondary particle.Xonotlite secondary particle is formed by the winding mutually of xonotlite crystal, intergrowth and the adhesion of fine shape, outer fiber is closeer, inside is bordering on hollow, and the volume density and the pearlstone of this offspring are close, and the thermal conductivity of particle itself is lower than pearlstone.The physical dimension of xonotlite secondary particle is 10~100 μ m, be suitable between the filling expansion perlite products endoparticle than macrovoid.
In addition, owing to contain a certain amount of colloid in the active slip of xonotlite, thereby have cohesiveness.These colloids in fact also are made up of the low-down xonotlite crystal of the degree of crystallinity with nanometer and inferior nano-scale.The variation of essence can not take place in xonotlite and colloid when heating below 1000 ℃.Adopt the active slip of this xonotlite as matrix material, except simple cohesive action, also can bring into play the packing action of xonotlite secondary particle, eliminate the large-size hole in the pearlstone.Adopt the active slip of xonotlite not resemble in addition and adopt the use temperature that can reduce expanded perlite product water glass and the cement as matrix material.Therefore the present invention adopts the matrix material of the active slip of xonotlite as expanded perlite product, compares with the conventional expanded perlite products, and thermal conductivity has tangible reduction, and intensity and resistance to elevated temperatures are significantly improved.
Preparation technology:
One, the preparation of the active slip of xonotlite
1, the raw material of the active slip of preparation xonotlite
The main raw material of the active slip of preparation xonotlite is quartz and lime.Used quartz is that granularity is the silica powder of 0~40 μ m.Silica powder can form through fragmentation and grinding with quartzite, vein quartz or quartz sand, also can be the fine-grained powder quartz of natural output.SiO in the quartz raw material
2Content should be greater than 98.0Wt.%.Used lime is common building lime, and CaO content should be at 80.0~99.6Wt.%, and MgO content should be at 0.1~10.0Wt.%, SiO
2Content should be at 0.1~10.0Wt.%, Al
2O
3Content should be at 0.1~3.0Wt.%, Fe
2O
3Content should be at 0.1~2.0Wt.%.Used lime is cleared up with 20~60 ℃ warm water, and crosses 100 orders and 200 order twice screen clothes, and leaching lime-ash is that milk of lime is standby.
2, batching and reaction conditions
With silica powder with by the milk of lime of above-mentioned requirements preparation with CaO/SiO
2Ratio prepare burden 1.10~0.98, and amount of makeup water to the ratio of water/(silica powder+lime) is 15~25, as the mixed slurry before the reaction.Above-mentioned mixed slurry packed into carry out the hot dynamic response of high-temperature high pressure water after the autoclave sealing that has whipping appts.Intensification in the reactor should be finished in 1.5~3.0 hours, was incubated 1.0~3.0 hours again after temperature rises to 220 ℃, and at this moment the equilibrium pressure in the reactor is about 2MPa.Stop supplying heat source after insulating process is finished and carry out the nature cooling.Naturally the reaction in the reactor is still being proceeded in Jiang Wen the process.Therefore should control the stirring dynamics and the heat-retaining condition of autoclave, making the interior temperature maintenance of autoclave is 3~5 hours in the time more than 180 ℃.When cooling to 160 ℃ naturally, should lead to water coolant and carry out fast cooling.Treat to take out slip after temperature in the kettle is reduced to nearly room temperature.Under the condition that has security measures to guarantee, (avoid scalding), also can be with and press material, to enhance productivity at 100~105 ℃.Can continuously stirring at above-mentioned reaction process mesohigh still, rotating speed is controlled at 50~80 rev/mins, also can intermittently stir, and rotating speed is controlled at 80~200 rev/mins.By the good slip of the resulting reaction of above-mentioned technology is exactly the active slip of xonotlite.
Two, the preparation of pearlstone-xonotlite compound insulating material
Pearlstone need select for use loose volume weight at 60~100kg/m
3Product.The pearlstone raw material is sneaked into the active slip of xonotlite, and blending ratio is that pearlstone accounts for 74~85Wt.%, and the active slip dry-matter of xonotlite accounts for 14~25Wt.%, and the alkali resistant glass fibre that adds 1.0Wt.% in addition is as fortifying fibre.After above-mentioned compound stirred, in mould, use the pressing machine pressure filtration molding with drainage function.Pressure is controlled at 0.10~0.15MPa during compacting.Wet base behind the pressure filtration molding is put into the oven dry kiln dry, and the temperature of drying kiln is controlled at 50~110 ℃.(water ratio≤1.0%, water ratio after the moisture absorption≤4.0% in air) can be used as the finished product sale after the goods drying.
The present invention has overcome water glass or cement can reduce common perlite products use temperature as binding agent shortcoming, but with micron order xonotlite hollow secondary particle fill expanded perlite granule than macrovoid, make the traditional water glass of the thermal conductivity ratio of composite product in the time of 800 ℃ descend nearly 30% in conjunction with expanded perlite product, folding strength and ultimate compression strength are enhanced about more than once, use temperature has improved nearly 200 ℃, and preparation cost remains on the level close with the conventional expanded perlite products.This composite product may replace xonotlite type calcium-silicate thermal insulation material (xonotlite type calcium-silicate thermal insulation material preparation cost is 2~3 times of conventional expanded perlite products) in many instances.Table 1 has compared the performance of typical conventional expanded perlite products, composite product of the present invention and typical xonotlite type calcium silicate board.
Performance conventional expanded perlite products composite product xonotlite of the present invention type calcium silicate board
(water glass)
Volume density (kg/m
3) 150≤210 220
Cold conditions ultimate compression strength (MPa) 0.56 〉=1.56 1.02
Cold conditions folding strength (MPa) 0.31 〉=0.81 0.49
Drying line shrinking percentage (%) 0.80≤1.50 1.50
Burn back linear shrinkage ratio (%) 4.50≤0.90 0.40
(800℃×16h)
Thermal conductivity (W/mK) 0.052≤0.056 0.056
(25℃)
Thermal conductivity (W/mK) 0.169≤0.128 0.128
(800℃)
Embodiment
Embodiment 1
The preparation of the active slip of xonotlite
Used silica powder is natural output and the natural quartz powder behind simple wet concentration, and commodity are called " konilite ", granularity 0~40 μ m, SiO
2Content is 99.1Wt.%, and the main chemical compositions of used lime is: CaO97.5Wt.%, MgO 1.2Wt.%, SiO
20.4Wt.%, Al
2O
30.4Wt.%, Fe
2O
30.5Wt.%.Lime is cleared up with 50 ℃ of warm water and is used for batching after 100 orders and 200 eye mesh screens are crossed in the back.
With above-mentioned " konilite " and lime emulsification with CaO/SiO
2Ratio prepare burden 1.05, and amount of makeup water to the ratio of water/(silica powder+lime) is 20, as the mixed slurry before the reaction.Above-mentioned mixed slurry packed into carry out the hot dynamic response of high-temperature high pressure water after the autoclave sealing that has whipping appts.Intensification in the reactor should be finished in 1.8 hours, was incubated 3 hours again after temperature rises to 220 ℃, stopped to supply with thermal source then and carried out the nature cooling.Naturally temperature in the kettle is reduced to 160 ℃ after lowering the temperature 4 hours.Feeding water coolant then in the cooling back installation of autoclave cools.When temperature is reduced to 105 ℃, open the discharge gate that is arranged on the autoclave bottom and carry out blowing, obtain the active slip of xonotlite.At above-mentioned reaction process mesohigh still is the stirring of having a rest, and stirs 10 minutes in per 1 hour, and rotating speed is controlled at 80 rev/mins.
The preparation of pearlstone-xonotlite compound insulating material
Selected pearlstone raw material is that loose volume weight is at 70kg/m
3Product.The pearlstone raw material is sneaked into the active slip of xonotlite, and blending ratio is that pearlstone accounts for 79Wt.%, and the active slip dry-matter of xonotlite accounts for 20Wt.%, and the alkali resistant glass fibre that adds 1.0Wt.% in addition is as fortifying fibre.After above-mentioned compound stirred, in mould, use the pressing machine pressure filtration molding with drainage function.Pressure is controlled at 0.10MPa during compacting.Wet base behind the pressure filtration molding is put into the oven dry kiln dry, and the temperature in of drying kiln is controlled at 50 ℃, and the high temperature section temperature is 110 ℃.The base substrate of drying gets product after check.The physicals of resulting product is as shown in table 2.
Physical properties of articles among table 2 embodiment 1
Volume density (kg/m 3) | Cold strength (MPa) | Drying line shrinking percentage (%) | Burn 800 ℃ of back linear shrinkage ratios (%) * 16h) | Thermal conductivity (W/mK) | ||
Resistance to compression | Anti-folding | ??25℃ | ??800℃ | |||
??204 | ??1.56 | ??0.81 | ??1.47 | ????0.83 | ??0.052 | ??0.128 |
Embodiment 2
The preparation of the active slip of xonotlite
Used silica powder is with embodiment 1, granularity 0~40 μ m, SiO
2Content is 98.5Wt.%, and the main chemical compositions of used lime is: CaO89.3 Wt.%, MgO 3.4Wt.%, SiO
25.2Wt.%, Al
2O
31.3Wt.%, Fe
2O
30.8Wt.%.Lime is cleared up with 50 ℃ of warm water and is used for batching after 100 orders and 200 eye mesh screens are crossed in the back.
With above-mentioned " konilite " and milk of lime with CaO/SiO
2Ratio prepare burden 1.03, and amount of makeup water to the ratio of water/(silica powder+lime) is 20, as the mixed slurry before the reaction.Above-mentioned mixed slurry packed into carry out the hot dynamic response of high-temperature high pressure water after the autoclave sealing that has whipping appts.Intensification in the reactor was finished in 1.5 hours, was incubated 2 hours again after temperature rises to 220 ℃, stopped to supply with thermal source then and carried out the nature cooling.Naturally temperature in the kettle is reduced to 160 ℃ after lowering the temperature 4 hours.Feeding water coolant then in the cooling back installation of autoclave cools.When temperature is reduced to 105 ℃, open the discharge gate that is arranged on the autoclave bottom and carry out blowing, obtain the active slip of xonotlite.At above-mentioned reaction process mesohigh still is the stirring of having a rest, and stirs 30 minutes in per 1 hour, and rotating speed is controlled at 120 rev/mins.
The preparation of pearlstone-xonotlite compound insulating material
Selected pearlstone raw material loose volume weight is 80kg/m
3The pearlstone raw material is sneaked into the active slip of xonotlite, and blending ratio is that pearlstone accounts for 74Wt.%, and the active slip dry-matter of xonotlite accounts for 25Wt.%, and the alkali resistant glass fibre that adds 1.0Wt.% in addition is as fortifying fibre.After above-mentioned compound stirred, in mould, use the pressing machine pressure filtration molding with drainage function.Pressure is controlled at 0.15MPa during compacting.Wet base behind the pressure filtration molding is put into the oven dry kiln dry, and the temperature in of drying kiln is controlled at 50 ℃, and the high temperature section temperature is 110 ℃.The base substrate of drying gets product after check.The physicals of resulting product is as shown in table 3.
Physical properties of articles among table 3 embodiment 2
Volume density (kg/m 3) | Cold strength (MPa) | Drying line shrinking percentage (%) | Burn 800 ℃ of back linear shrinkage ratios (%) * 16h) | Thermal conductivity (W/mK) | ||
Resistance to compression | Anti-folding | ??25℃ | ??800℃ | |||
??208 | ??1.58 | ??0.84 | ??1.32 | ??0.81 | ??0.054 | ??0.122 |
Claims (5)
1. pearlstone-xonotlite compound insulating material is characterized in that pearlstone selects for use loose volume weight at 60~100kg/m
3Product, the pearlstone raw material is sneaked into the active slip of xonotlite, blending ratio is that pearlstone accounts for 74~85Wt.%, and the active slip dry-matter of xonotlite accounts for 14~25Wt.%, and the alkali resistant glass fibre that adds 1.0Wt.% in addition is as fortifying fibre; The main raw material of the active slip of preparation xonotlite is quartz and lime, and used quartz is that granularity is the silica powder of 0~40 μ m; Silica powder can form through fragmentation and grinding with quartzite, vein quartz or quartz sand, also can be the fine-grained powder quartz of natural output, SiO in the quartz raw material
2Content should be greater than 98.0Wt.%; Used lime is common building lime, and CaO content should be at 80.0~99.6Wt.%, and MgO content should be at 0.1~10.0Wt.%, SiO
2Content should be at 0.1~10.0Wt.%, Al
2O
3Content should be at 0.1~3.0Wt.%, Fe
2O
3Content should be at 0.1~2.0Wt.%.
2. the preparation method of pearlstone-xonotlite compound insulating material, after it is characterized in that compound that the active slip dry-matter of pearlstone, xonotlite, alkali resistant glass fibre are formed stirs, in mould, use the pressing machine pressure filtration molding with drainage function; Pressure is controlled at 0.10~0.15Mpa during compacting, and the wet base behind the pressure filtration molding is put into the oven dry kiln dry, and the temperature of drying kiln is controlled at 50~110 ℃, water ratio after the goods drying≤1.0%, water ratio after the moisture absorption≤4.0% in air.
3. the preparation method of pearlstone as claimed in claim 2-xonotlite compound insulating material, it is characterized in that the preparation technology of the active slip of xonotlite is: silica powder and milk of lime are with CaO/SiO
2Ratio prepare burden 1.10~0.98, and amount of makeup water to the ratio of water/(silica powder+lime) is 15~25, as the mixed slurry before the reaction, milk of lime is cleared up with 20~60 ℃ warm water, and mistake 100 orders and 200 order twice screen clothes; Silica powder and milk of lime mixed slurry are packed into and are carried out the hot dynamic response of high-temperature high pressure water after the autoclave sealing that has whipping appts, intensification in the reactor should be finished in 1.5~3.0 hours, be incubated 1.0~3.0 hours again after temperature rises to 220 ℃, at this moment the equilibrium pressure in the reactor is about 2Mpa; Stop supplying heat source after insulating process is finished and carry out the nature cooling, naturally the reaction in the reactor is still being proceeded in Jiang Wen the process, therefore should control the stirring dynamics and the heat-retaining condition of autoclave, making the interior temperature maintenance of autoclave is 3~5 hours in the time more than 180 ℃; When cooling to 160 ℃ naturally, should lead to water coolant and carry out fast cooling, treat to take out slip after temperature in the kettle is reduced to nearly room temperature.
4. the preparation method of pearlstone as claimed in claim 3-xonotlite compound insulating material, it is characterized in that preparing the active slip reaction process of xonotlite mesohigh still and adopt continuously stirring, rotating speed is controlled at 50~80 rev/mins, naturally cool to 100~105 ℃ and be with and press material, to enhance productivity.
5. the preparation method of pearlstone as claimed in claim 3-xonotlite compound insulating material, it is characterized in that preparing the active slip reaction process of xonotlite mesohigh still and adopt intermittently stirring, rotating speed is controlled at 80~200 rev/mins, cools to 100~105 ℃ naturally and is with and presses material.
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CN101967052A (en) * | 2010-09-15 | 2011-02-09 | 广东新元素板业有限公司 | Process for manufacturing high-strength low-density asbestos fiber-free enhanced silicate plate |
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