CN112500116B - Stable heat-preservation inorganic board and preparation method thereof - Google Patents
Stable heat-preservation inorganic board and preparation method thereof Download PDFInfo
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention provides a stable heat-insulating inorganic board and a preparation method thereof, wherein the inorganic board comprises a base material, 0.95-1.05 wt% of cationic polyacrylamide solution and a modified flocculating aid; the base material comprises inorganic refractory fibers, clay mineral substances, inorganic fillers, infrared opacifiers and solid components in inorganic binders, wherein the mass ratio of the inorganic refractory fibers to the clay mineral substances to the inorganic fillers is 50-70: 5-8: 6-10: 9-12: 10-20; the mass ratio of the base material to the cationic polyacrylamide solution is 18-22: 1; the mass ratio of the base material to the modified flocculating aid is 55-65: 1; the modified flocculating aid is prepared from an active silicic acid solution, a flocculating aid and a silane coupling agent. The modified flocculating aid in the inorganic board can improve the anti-shearing capability of a floc group, and the stable heat-insulating inorganic board is directly prepared by one-step drying without high-temperature calcination; the inorganic board is smokeless and tasteless when used in high temperature environment, and the product has stable volume weight, mechanical property and heat insulation property.
Description
Technical Field
The invention belongs to the technical field of inorganic materials, and particularly relates to a stable heat-insulating inorganic board and a preparation method thereof.
Background
In the traditional preparation process of the ceramic fiber inorganic board, a starch organic binder is generally required to be added, flocculation is realized through the combined action of the starch organic binder and an inorganic binder (such as silica sol), the fiberboard containing the organic binder is obtained after drying, and the ceramic fiber inorganic board can be obtained after organic matters are removed through high-temperature calcination.
The main function of adding the starch organic binder is to promote flocculation, ensure the normal temperature strength of the fiber board after drying, but for inorganic boards, the subsequent high-temperature calcination process must burn off starch organic matters, so that the addition of starch becomes meaningless, not only increases the raw material cost, but also generates a large amount of toxic and harmful smoke due to decomposition of the organic matters in the high-temperature calcination process, seriously pollutes the production and living environment, and simultaneously consumes a large amount of electric energy and natural gas due to high-temperature calcination, so that the production cost is further increased; in addition, for the ceramic fiber board prepared by the wet process, the anti-shearing capacity of the floccules is poor in the flocculation and papermaking processes, the floccules are prone to being broken up under the action of shearing force or other external force in the stirring, discharging and forming processes, a large number of powder particles fall off from the fiber surface to enable slurry to become turbid, water filtration is difficult or even impossible to form, large fluctuation of the volume weight, the mechanical property and the thermal property of the finished product fiber board is directly caused, and the quality stability of the product is seriously influenced.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a stable type heat-insulating inorganic board having stable volume weight and heat-insulating property, and a method for preparing the same.
The invention provides a stable heat-preservation inorganic board which comprises the following components:
the base material, 0.95-1.05 wt% of cationic polyacrylamide solution and a modified flocculating aid;
the base material comprises inorganic refractory fibers, clay mineral substances, inorganic filler, infrared opacifier and solid components in inorganic binder in a mass ratio of 50-70: 5-8: 6-10: 9-12: 10-20; the mass ratio of the base material to the cationic polyacrylamide solution is 18-22: 1; the mass ratio of the base material to the modified flocculating aid is 55-65: 1;
the modified flocculating aid is prepared from an active silicic acid solution, a flocculating aid and a silane coupling agent; SiO in the active silicic acid solution2The solid content is 5-13%, and the pH value is 2-4; the flocculation auxiliary agent is selected from one or more of ferric chloride, aluminum sulfate and polyaluminium chloride.
Preferably, the solid content of the flocculation aid in the active silicic acid solution is 20-50%; the solid content of the silane coupling agent in the active silicic acid solution is 0.1-0.3%.
Preferably, the inorganic refractory fibers are selected from one or more of alumina silicate fibers, magnesium silicate fibers, high silica fibers, quartz fibers, alumina fibers, polycrystalline mullite fibers;
the clay mineral is selected from at least two of bentonite, zeolite powder, needle-shaped wollastonite, kaolin, sepiolite powder, attapulgite, hydrotalcite powder, dolomite powder, thin diaspore powder and modified coal gangue powder, and the clay mineral necessarily contains bentonite;
the inorganic filler is selected from one or more of alumina, aluminum hydroxide, silica micropowder, quartz sand, zircon sand, diatomite, calcium oxide, calcium hydroxide and calcium carbonate;
the infrared opacifier is selected from one or more of nano titanium oxide, nano zirconium silicate, potassium hexatitanate whiskers, superfine alumina powder, superfine aluminum hydroxide powder, carbon black, silicon carbide and silicon nitride;
the inorganic binder is selected from one or more of industrial water glass, acidic silica sol, alkaline silica sol, neutral silica sol and aluminum dihydrogen phosphate solution.
Preferably, the bentonite content in the clay mineral is 50-70 wt%;
the bentonite is selected from one or more of sodium bentonite, calcium bentonite and hydrogen bentonite;
the specific surface area of the bentonite is 168-172 m2(ii) a particle size of 7.5 to 8.5 μm/g.
Preferably, the length of the inorganic refractory fiber is 0.1-3 cm, and the diameter is 0.5-8 μm;
the specific surface area of the clay mineral is 30-200 m2The particle size is 5-25 μm.
Preferably, the silane coupling agent is selected from one or more of KH550, KH560 and KH 570.
Preferably, the volume weight of the heat-insulating inorganic board is 300-400 kg/m3(ii) a The average thermal conductivity at 500 ℃ is less than 0.13W/(m.k).
The invention provides a preparation method of the stable heat-insulating inorganic board in the technical scheme, which comprises the following steps:
mixing inorganic refractory fiber, clay mineral substances, inorganic filler, an infrared opacifier, an inorganic bonding agent and water, and fully stirring to obtain slurry; mixing the flocculating aid, the active silicic acid solution and the silane coupling agent, and fully stirring to obtain a modified flocculating aid solution;
mixing the slurry with 0.95-1.05 wt% of cationic polyacrylamide solution and the modified flocculation aid solution, and flocculating to obtain flocculated slurry;
and dehydrating the flocculated slurry to obtain a wet blank, and drying to obtain the stable heat-insulating inorganic board.
Preferably, the drying adopts hot air drying or microwave drying;
the hot air drying temperature is 120-150 ℃, and the time is 10-15 h;
the microwave drying temperature is 100-130 ℃, and the time is 4-8 h.
The modified flocculating aid in the inorganic board provided by the invention can improve the anti-shearing capacity of the floc, solves the problem that the floc is easy to stir and break up in the production process of the inorganic fiberboard, and directly prepares the stable heat-insulating inorganic board through one-step drying without a high-temperature calcination process; the stable heat-insulating inorganic board is smokeless and tasteless when used in a high-temperature environment, and has stable volume weight, mechanical property and heat-insulating property. The experimental results show that: the volume weight of the stable heat-insulating inorganic board prepared by the invention is 300-400 kg/m3(ii) a Its average thermal conductivity at 500 deg.C<0.13W/(m.k); the normal-temperature compressive strength is 0.15-0.25 MPa, and the flexural strength is 0.15-0.3 MPa; can be applied to the heat insulation field of large industrial kiln equipment, pipelines and the like in the industries of petrifaction, metallurgy, electric power and the like.
Detailed Description
The invention provides a stable heat-preservation inorganic board which comprises the following components:
the base material, 0.95-1.05 wt% of cationic polyacrylamide solution and a modified flocculating aid;
the base material comprises inorganic refractory fibers, clay mineral substances, inorganic filler, infrared opacifier and solid components in inorganic binder in a mass ratio of 50-70: 5-8: 6-10: 9-12: 10-20; the mass ratio of the base material to the cationic polyacrylamide solution is 18-22: 1; the mass ratio of the base material to the modified flocculating aid is 55-65: 1;
the modified flocculating aid is prepared from an active silicic acid solution, a flocculating aid and a silane coupling agent; SiO in the active silicic acid solution2The solid content is 5-13%, and the pH value is 2-4; the flocculation auxiliary agent is selected from one or more of ferric chloride, aluminum sulfate and polyaluminium chloride.
The inorganic board provided by the present invention has excellent volume weight stability and thermal insulation performance by the combined action of the above-mentioned amounts of components. Also has excellent mechanical properties.
The stable heat-insulating inorganic board provided by the invention comprises a base material; the base material comprises inorganic refractory fibers, clay minerals, inorganic fillers, infrared opacifiers and solid components in inorganic binders in a mass ratio of 50-70: 5-8: 6-10: 9-12: 10-20.
In the present invention, the inorganic refractory fiber is preferably selected from one or more of aluminum silicate fiber, magnesium silicate fiber, high silica fiber, quartz fiber, alumina fiber, and polycrystalline mullite fiber. The inorganic refractory fibers should have a suitable length and diameter to facilitate flocculation and maintain floc stability; the length of the inorganic refractory fiber is 0.1-3 cm, preferably 1-2 cm; the diameter of the inorganic refractory fiber is 0.5-8 μm, preferably 2-6 μm; in a specific embodiment, the inorganic refractory fibers have a length of 1.5cm and a diameter of 3 μm.
In the invention, the clay mineral refers to a clay mixture which has specific surface area and particle size and can effectively adsorb certain components from liquid after being mixed according to a certain proportion. The specific surface area of the clay mineral is 30-200 m2The particle size is 5-25 μm. The clay mineral is preferably selected from at least two of bentonite, zeolite powder, needle-shaped wollastonite, kaolin, sepiolite powder, attapulgite, hydrotalcite powder, dolomite powder, thin diaspore powder and modified coal gangue powder, and the clay mineral necessarily contains bentonite; the content of the bentonite in the clay mineral is preferably 50-70 wt%, more preferably 55-65 wt%, and most preferably 65%. The bentonite is selected from sodium baseOne or more of bentonite, calcium bentonite and hydrogen bentonite; preferably selected from sodium bentonite; the specific surface area of the bentonite is 168-172 m2(ii)/g, the particle size is 7.5-8.5 μm; in a specific embodiment, the specific surface area of the sodium bentonite is 170m2(ii)/g, particle size 8 μm; the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2A particle size of 12 μm/g. The clay mineral with specific surface area and granularity can be used as an adsorbent after being mixed according to a certain proportion, and perfect flocculation with an inorganic binding agent (such as silica sol) is realized through surface complexation and electrostatic attraction, so that the flocculation of the substituted starch organic binder and the silica sol can be realized, and the components of the whole high-strength inorganic board are inorganic components; it is particularly emphasized that for adsorbents composed of said clay-like minerals, where the specific surface area, particle size of the clay species and the combination of different types of clay have a significant effect on the adsorption performance, the larger the specific surface area and the smaller the particle size, the better the adsorption performance.
According to the invention, through selecting the clay minerals with proper types and proportions, the inorganic filler, the infrared opacifier and the inorganic binding agent can be effectively adsorbed, and then the flocculation effect of the substituted starch organic binder and the inorganic binding agent can be realized by combining the combined action of the modified flocculation auxiliary agent and the cationic amide.
In the present invention, the inorganic filler is preferably selected from one or more of alumina, aluminum hydroxide, silica micropowder, quartz sand, zircon sand, diatomaceous earth, calcium oxide, calcium hydroxide and calcium carbonate.
In the present invention, the infrared opacifier preferably includes one or more of nano titanium oxide, nano zirconium silicate, potassium hexatitanate whisker, ultrafine aluminum oxide powder, ultrafine aluminum hydroxide powder, carbon black, silicon carbide and silicon nitride.
In the present invention, the inorganic binder is selected from one or more of industrial water glass, acidic silica sol, alkaline silica sol, neutral silica sol and aluminum dihydrogen phosphate solution. The mass content of solid components in the inorganic bonding agent is preferred28 to 33%. In a specific example, the inorganic binder has a solid content of 30%. SiO in the neutral silica sol2The solids content was 30%.
The inorganic filler and the infrared opacifier powder material adopted by the invention are beneficial to improving the integral volume weight and strength of an inorganic board on the one hand, and can reduce radiation heat transfer in a high-temperature environment on the other hand, so as to improve the high-temperature resistance of the inorganic board, but a certain amount of inorganic filler and the infrared opacifier powder are dispersed in slurry, so that the flocculation process becomes more difficult, the strength of a floc generated after flocculation is often lower, particularly the shearing resistance is poorer, the material is usually discharged while stirring in the actual production process, the discharging speed is required to be matched with the walking speed of a forming net, the discharging speed is too fast, a wet embryo is easily caused to overflow on the surface of the forming net, meanwhile, the water filtration is incomplete, the moisture content of the wet embryo is higher, the subsequent drying process is not facilitated, and the floc which is flocculated can not be scattered by a stirring paddle in the discharging and stirring process, namely, has a certain shearing resistance at a certain stirring speed within a certain time, otherwise, the flocs can be broken up and destroyed by stirring for a short time, so that the powder materials flocculated on the fiber surface fall off from the fiber surface and are re-dispersed in the slurry, and water filtration is difficult or even the forming cannot be carried out at all. Theoretically, any floc can be broken up after long-time stirring, and the faster the stirring speed, the shorter the time for breaking up the floc, so that the improvement of the stability of the floc, namely the shear resistance is necessary, and the floc is guaranteed not to be broken up by the stirring paddle at least in the production process; therefore, the technical scheme of the invention is to carry out pre-modification treatment on the flocculation auxiliary agent, so that the flocculation auxiliary agent can better exert the performance when being combined with amide for use, further improve the shear resistance of flocs and ensure that the actual production process can be smoothly carried out.
The base material comprises inorganic refractory fibers, clay mineral substances, inorganic filler, infrared opacifier and solid components in inorganic binder in a mass ratio of 50-70: 5-8: 6-10: 9-12: 10-20; preferably 96-113.4: 11.2-13.23: 12.8-15.12: 16-19: 24-28.35. In specific examples, the inorganic refractory fiber, clay mineral, and inorganic materialThe mass ratio of the solid components in the filler, the infrared opacifier and the inorganic binder is 96: 11.2: 12.8: 16: 24; or 113.4: 13.23: 15.12: 19: 28.35. in the invention, the base material comprises, by mass, 96: 7.28: 2.35: 1.57: 12.8: 16: 24 aluminum silicate fiber, sodium bentonite, needle-shaped wollastonite, zeolite powder, silicon micropowder, nano titanium oxide and SiO in neutral silica sol2(ii) a Or comprises the following components in mass ratio of 96: 7.28: 2.35: 1.57: 12.8: 16: 24 aluminum silicate fiber, sodium bentonite, needle-shaped wollastonite, zeolite powder, silicon micropowder, potassium hexatitanate whisker and SiO in neutral silica sol2(ii) a Or comprises the following components in mass ratio of 96: 7.28: 2.35: 1.57: 12.8: 16: 24 aluminum silicate fiber, sodium bentonite, needle-shaped wollastonite, zeolite powder, silicon micropowder, silicon nitride and SiO in neutral silica sol2(ii) a Or comprises the following components in a mass ratio of 113.4: 8.6: 2.78: 1.85: 15.12: 19: 28.35 of alumina fiber, sodium bentonite, needle-like wollastonite, zeolite powder, silicon micropowder, silicon nitride and SiO in neutral silica sol2。
The stable heat-preservation inorganic board provided by the invention comprises 0.95-1.05 wt% of cationic polyacrylamide solution; the cationic polyacrylamide solution is a flocculant. In a specific embodiment, the cationic polyacrylamide solution is a 1% cationic polyacrylamide solution.
The stable heat-insulating inorganic board provided by the invention comprises a modified flocculating aid; the modified flocculating aid is prepared from an active silicic acid solution, a flocculating aid and a silane coupling agent; SiO in the active silicic acid solution2The solid content is 5-13%, and the pH value is 2-4; the flocculation auxiliary agent is selected from one or more of ferric chloride, aluminum sulfate and polyaluminium chloride. In the present invention, the type of the silane coupling agent is preferably one or more selected from KH550, KH560 and KH 570.
In the invention, the metal cations contained in the flocculating aid can reduce the potential difference of Zeta of the inorganic binding agent, destroy the stability of the inorganic binding agent and further flocculate under the action of amide, and in the actual use process, the flocculating aid can be directly added in a solid state or prepared into a water-soluble solution with proper concentrationLiquid for addition; in order to realize better flocculation effect and improve the shearing resistance of flocculated flocs, the invention uses an active silicic acid solution as a solvent to replace water and introduces a silane coupling agent into the solvent to prepare a flocculation aid solution so as to achieve the aim of pre-modifying the flocculation aid: h in active silicic acid solution+Ion exchange can be carried out between the inorganic binder and cations between bentonite layers serving as an adsorbent, so that the bentonite has stronger adsorbability on the inorganic binder, meanwhile, the active silicic acid solution contains a large amount of active Si-OH groups, and after a cationic amide flocculating agent is added, the cationic amide is favorably attracted to be attached to the surface of the bentonite, and then, the silane coupling agent and fibers realize oxygen bridging bonding, so that all powder added in the slurry is finally flocculated on the inorganic refractory fibers, the macroscopic phenomenon is represented as solid-liquid separation, namely, the flocs are settled at the bottom of a container, and clear liquid appears on the upper layer; the invention has the advantages that the flocculation auxiliary agent is pre-modified, and simultaneously forms floccules through electrostatic adsorption and oxygen-bridge bonding, so that the stability of the floccules is improved, namely the anti-shearing function of the floccules is increased; it is especially emphasized that in the flocculation process, the destruction of the metal cation in the flocculation aid to the inorganic binder electrical layer, the adsorption of the clay adsorbent to the inorganic binder, the adhesion flocculation of the amide and the bridging oxygen bonding occur almost simultaneously, therefore, the invention carries out the pre-modification treatment on the flocculation aid, namely, the preparation of the flocculation aid solution in the silicic acid solution in advance and the introduction of the silane coupling agent, which is more beneficial to the flocculation and further improves the floc strength.
In the present invention, the active silicic acid solution is preferably prepared according to the following method:
and carrying out ion exchange on the industrial water glass and styrene cation exchange resin to obtain an active silicic acid solution. The modulus of the industrial water glass is 3.3, SiO2The content is 26%.
In the invention, the solid content of the flocculation aid in the active silicic acid solution is 20-50%, preferably 30-40%; the solid content of the silane coupling agent in the active silicic acid solution is 0.1-0.3%, and preferably 0.15-0.20%.
In the inventionIn the embodiment, the modified flocculation auxiliary agent is a transparent modified aluminum sulfate flocculation auxiliary agent solution with the aluminum sulfate concentration of 40 wt%, the pH value of 3.5 and the SiO2 solid content of 5.2%; or transparent modified aluminum sulfate flocculation aid solution with the aluminum sulfate concentration of 40%, the pH value of 3.1 and the SiO2 solid content of 6.5%; or aluminum sulfate with concentration of 40%, pH of 2.6, SiO2A transparent modified aluminum sulfate flocculation aid solution with the solid content of 8.7 percent; or aluminum sulfate with concentration of 40%, pH of 2.2, SiO2A transparent modified aluminum sulfate flocculation aid solution with the solid content of 13 percent; or aluminum sulfate with concentration of 40%, pH of 2.2, SiO2A transparent modified aluminum sulfate flocculation aid solution with the solid content of 13 percent;
in the invention, the mass ratio of the base material to the cationic polyacrylamide solution is preferably 18-22: 1, and more preferably 19-21: 1; the mass ratio of the base material to the modified flocculating aid is preferably 55-65: 1, and more preferably 58-62: 1. In a specific embodiment, the mass ratio of the base material to the cationic polyacrylamide solution is preferably 216: 10.8 of the total weight of the mixture; or 255.25: 12.8. In a specific embodiment, the mass ratio of the base material to the modified flocculating aid is 216: 3.6; or 255.25: 4.25.
In the present invention, the heat-insulating inorganic board has a volume weight of 300 to 400kg/m3(ii) a The average thermal conductivity at 500 ℃ is less than 0.13W/(m.k).
The invention provides a preparation method of the stable heat-insulating inorganic board in the technical scheme, which comprises the following steps:
mixing inorganic refractory fiber, clay mineral substances, inorganic filler, an infrared opacifier, an inorganic bonding agent and water, and fully stirring to obtain slurry; mixing the flocculating aid, the active silicic acid solution and the silane coupling agent, and fully stirring to obtain a modified flocculating aid solution;
mixing the slurry with 0.95-1.05 wt% of cationic polyacrylamide solution and the modified flocculation aid solution, and flocculating to obtain flocculated slurry;
and dehydrating the flocculated slurry to obtain a wet blank, and drying to obtain the stable heat-insulating inorganic board.
In the invention, the slurry is mixed with 0.95-1.05 wt% of cationic polyacrylamide solution and the modified flocculating auxiliary agent solution for flocculation; whether flocculation was sufficient was checked by turbidity of the separated aqueous phase: after flocculation occurs, floccules settle at the bottom of the container, supernatant is taken and detected by a turbidimeter, and when the turbidity is less than 35, flocculation is considered to be sufficient, namely clay mineral substances, inorganic filler, infrared opacifier and inorganic binder added in the slurry are sufficiently flocculated on inorganic refractory fibers, so that smooth and smooth forming of water filtration can be ensured, and meanwhile, the fiber board can reach the designed strength index after being dried.
The present invention preferably tests the stability of the flocs:
continuously stirring 30g of flocs and 500mL of water at 800rpm for a certain time, and observing whether the aqueous solution is turbid or not; if turbid, the flocs are broken up and the time is recorded. The shear resistance of the different flocks is characterized.
The flocculated slurry is dewatered to obtain a wet blank, and the wet blank is dried to obtain the stable heat-preservation inorganic board. In the invention, the dehydration adopts a vacuum suction filtration mode; the vacuum degree of the suction filtration is-0.05 to-0.1 MPa, and the time is 20 to 50 s; in a specific embodiment, the vacuum degree of the suction filtration is-0.095 MPa; the time period was 40 s.
The drying adopts hot air drying or microwave drying; the temperature of the hot air drying is preferably 120-150 ℃, and more preferably 130-135 ℃; the time is preferably 10-15 h, and preferably 12-13 h. The temperature of the microwave drying is preferably 100-130 ℃, and more preferably 110-115 ℃; the microwave drying time is preferably 4-8 h, and more preferably 6-7 h; in the specific embodiment, the temperature of hot air drying is 130 ℃, and the time is 12 h; the temperature of the microwave drying is 110 ℃, and the time is 6 h.
The process provided by the invention has the advantages that the modified flocculating aid is used, so that the anti-shearing force performance of a floc group is greatly improved, and the stability is enhanced, so that the inorganic board has stable volume weight, mechanical property and heat insulation performance, and meanwhile, a starch organic binder is not used, so that the stable heat-insulating inorganic board prepared by the invention is smokeless and odorless when used in a high-temperature environment, and is more beneficial to environmental protection.
The stable heat-insulating inorganic board removes the starch organic binder in the preparation process, greatly improves the anti-shearing force performance of the floccule by performing pre-modification treatment on the flocculation auxiliary agent, solves the problem that the floccule is easy to stir and break up in the production process of the fiberboard, and directly prepares the stable heat-insulating inorganic board through one-step drying without a high-temperature calcination process; the stable heat-insulating inorganic board is smokeless and odorless when used in a high-temperature environment, and has stable volume weight, mechanical property and heat-insulating property.
To further illustrate the present invention, a stable type heat-insulating inorganic board and a method for manufacturing the same according to the present invention will be described in detail with reference to examples, which should not be construed as limiting the scope of the present invention.
Example 1
Injecting 8L of deionized water into a stirring container, then adding 96g of aluminum silicate fibers, starting stirring, wherein the length of the aluminum silicate fibers is 1.5cm, and the diameter of the aluminum silicate fibers is 3 mu m; then 7.28g of sodium bentonite, 2.35g of needle-shaped wollastonite and 1.57g of zeolite powder are added and fully stirred for 5min to uniformly disperse the slurry, wherein the specific surface area of the sodium bentonite is 170m2The grain size is 8 mu m, the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2(ii)/g, particle size 12 μm; then 12.8g of fine silica powder, 16g of nano titanium oxide and 80g of neutral silica Sol (SiO) were added2Solid content 30%), and stirring for 5min to disperse the slurry uniformly.
10ml of industrial water glass solution (modulus 3.3, SiO)2Solid content of 26%) and 40ml of deionized water, stirring uniformly, then making ion exchange on the diluted water glass solution by using styrene cation exchange resin to obtain 50ml of active silicic acid solution, then adding 34g of solid aluminium sulfate into 50ml of active silicic acid solution, fully stirring for 5min, after the solution is clarified, adding 0.1g of KH550, stirring for 2min to obtain SiO solid with pH value of 3.5 and aluminium sulfate concentration of 40%, and making the aluminium sulfate be dissolved in the solution2A transparent modified aluminum sulfate flocculation aid solution with the solid content of 5.2 percent;
adding 10.8g of 1% cationic polyacrylamide solution and 3.6g of modified aluminum sulfate flocculation aid solution into the mixed slurry at the same time, continuously stirring for 1min after flocculation occurs, taking supernatant liquid, and detecting by using a turbidimeter to obtain a turbidity value of 34; pouring the flocculated slurry into a mould (220mm multiplied by 220mm), dehydrating in a vacuum suction filtration mode, wherein the vacuum degree of the suction filtration is-0.095 MPa, the suction filtration time is 40s, and leveling and thickness setting are carried out to obtain a wet blank with the length multiplied by 220mm multiplied by 10mm (length multiplied by width multiplied by thickness); drying the wet blank in a blast drying box at the hot air drying temperature of 130 ℃ for 12 hours to obtain an aluminum silicate fiber stable heat-preservation inorganic board; and additionally weighing 30g of flocs which are not counted by the total mass of the sample and prepared according to the formula, putting the flocs into a measuring cup, adding 500ml of water, starting stirring at the rotating speed of 800rpm, and continuously stirring for 2min to ensure that the water solution becomes turbid and the flocs are scattered.
The stable heat-insulating inorganic board has a volume weight of 320kg/m3Average 500 ℃ thermal conductivity of 0.128W/(m.k); the compression strength at normal temperature is 0.16MPa, the breaking strength is 0.17MPa, and the floccule can not be broken up within 2min at the rotation speed of 800 r/min.
Example 2
Injecting 8L of deionized water into a stirring container, then adding 96g of aluminum silicate fibers, starting stirring, wherein the length of the aluminum silicate fibers is 1.5cm, and the diameter of the aluminum silicate fibers is 3 mu m; then adding 7.28g of sodium bentonite, 2.35g of needle-shaped wollastonite and 1.57g of zeolite powder, fully stirring for 5min to uniformly disperse the slurry, wherein the specific surface area of the sodium bentonite is 170m2The grain size is 8 mu m, the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2(ii)/g, particle size 12 μm; then 12.8g of fine silica powder, 16g of nano titanium oxide and 80g of neutral silica Sol (SiO) were added2Solid content 30%), and stirring for 5min to disperse the slurry uniformly.
10ml of industrial water glass solution (modulus 3.3, SiO)226 percent of solid content) and 30ml of deionized water, evenly stirring, then carrying out ion exchange on the diluted water glass solution through styrene cation exchange resin to obtain 40ml of active silicic acid solution, then adding 27g of solid aluminum sulfate into 40ml of active silicic acid solution, fully stirring for 5min, adding 0.08g of KH560 after the solution is clarified, and stirring for 2min to obtain sulfuric acidAluminum concentration of 40%, pH 3.1, SiO2A transparent modified aluminum sulfate flocculation aid solution with the solid content of 6.5 percent;
adding 10.8g of 1% cationic polyacrylamide solution and 3.6g of modified aluminum sulfate flocculation aid solution into the mixed slurry at the same time, continuously stirring for 1min after flocculation occurs, taking supernatant liquid, and detecting by using a turbidimeter to obtain a turbidity value of 30; pouring the flocculated slurry into a mould (220mm multiplied by 220mm), dehydrating in a vacuum suction filtration mode, wherein the vacuum degree of the suction filtration is-0.095 MPa, the suction filtration time is 40s, and leveling and thickness setting are carried out to obtain a wet blank with the length multiplied by 220mm multiplied by 10mm (length multiplied by width multiplied by thickness); drying the wet blank in a blast drying box at the hot air drying temperature of 130 ℃ for 12 hours to obtain an aluminum silicate fiber stable heat-preservation inorganic board; and additionally weighing 30g of flocs which are not counted by the total mass of the sample and prepared according to the formula, putting the flocs into a measuring cup, adding 500ml of water, starting stirring at the rotating speed of 800rpm, and continuously stirring for 5min to ensure that the water solution becomes turbid and the flocs are scattered.
The stable heat-insulating inorganic board has a volume weight of 324kg/m3Average thermal conductivity coefficient at 500 ℃ of 0.128W/(m.k); the compression strength at normal temperature is 0.162MPa, the breaking strength is 0.174MPa, and the floccule can not be broken up within 5min at the rotation speed of 800 r/min.
Example 3
Injecting 8L of deionized water into a stirring container, then adding 96g of aluminum silicate fibers, starting stirring, wherein the length of the aluminum silicate fibers is 1.5cm, and the diameter of the aluminum silicate fibers is 3 mu m; then adding 7.28g of sodium bentonite, 2.35g of needle-shaped wollastonite and 1.57g of zeolite powder, fully stirring for 5min to uniformly disperse the slurry, wherein the specific surface area of the sodium bentonite is 170m2The grain size is 8 mu m, the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2(iv) g, particle size 12 μm; then 12.8g of fine silica powder, 16g of potassium hexatitanate whisker and 80g of neutral silica Sol (SiO)2Solid content 30%), and stirring for 5min to disperse the slurry uniformly. 10ml of industrial water glass solution (modulus 3.3, SiO)2Solid content 26%) and 20ml deionized water, stirring uniformly, and passing the diluted water glass solution through styrene cation exchange resin for ion exchangeTo obtain 30ml of active silicic acid solution, adding 20g of solid aluminum sulfate into 30ml of active silicic acid solution, stirring for 5min, adding 0.06g of KH570 after the solution is clarified, and stirring for 2min to obtain SiO with the pH value of 2.6 and the aluminum sulfate concentration of 40 percent and the pH value of 2.62A transparent modified aluminum sulfate flocculation aid solution with the solid content of 8.7 percent;
adding 10.8g of 1% cationic polyacrylamide solution and 3.6g of modified aluminum sulfate flocculation aid solution into the mixed slurry at the same time, continuously stirring for 1min after flocculation occurs, taking supernatant liquid, and detecting by using a turbidimeter to obtain a turbidity value of 27; pouring the flocculated slurry into a mould (220mm multiplied by 220mm), dehydrating in a vacuum suction filtration mode, wherein the vacuum degree of the suction filtration is-0.095 MPa, the suction filtration time is 40s, and flattening and fixing the thickness to obtain a wet blank (length multiplied by width multiplied by thickness) of 220mm multiplied by 10 mm; drying the wet blank in a blast drying oven at a hot air drying temperature of 130 ℃ for 12 hours to obtain an aluminum silicate fiber stable heat-insulating inorganic board; and additionally weighing 30g of flocs which are not counted by the total mass of the sample and prepared according to the formula, putting the flocs into a measuring cup, adding 500ml of water, starting stirring at the rotating speed of 800rpm, and continuously stirring for 7min to ensure that the water solution becomes turbid and the flocs are scattered.
The stable heat-insulating inorganic board has a volume weight of 326kg/m3Average thermal conductivity at 500 ℃ of 0.127W/(m.k); the compression strength at normal temperature is 0.165MPa, the breaking strength is 0.179MPa, and the floccules can not be broken up within 7min at the rotation speed of 800 r/min.
Example 4
Injecting 8L of deionized water into a stirring container, then adding 96g of aluminum silicate fibers, starting stirring, wherein the length of the aluminum silicate fibers is 1.5cm, and the diameter of the aluminum silicate fibers is 3 mu m; then adding 7.28g of sodium bentonite, 2.35g of needle-shaped wollastonite and 1.57g of zeolite powder, fully stirring for 5min to uniformly disperse the slurry, wherein the specific surface area of the sodium bentonite is 170m2The grain size is 8 mu m, the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2(ii)/g, particle size 12 μm; 12.8g of fine silica powder, 16g of silicon nitride and 80g of neutral silica Sol (SiO) were then added2Solid content 30%), and stirring for 5min to disperse the slurry uniformly. Taking 10ml of industrial water glassSolution (modulus 3.3, SiO)2Solid content of 26%) and 10ml of deionized water, stirring uniformly, then making ion exchange on the diluted sodium silicate solution by using styrene cation exchange resin to obtain 20ml of active silicic acid solution, then adding 13g of solid aluminium sulfate into 20ml of active silicic acid solution, fully stirring for 5min, after the solution is clarified, adding 0.04g of KH570, stirring for 2min to obtain the invented product whose aluminium sulfate concentration is 40%, pH value is 2.2 and SiO is obtained2A transparent modified aluminum sulfate flocculation aid solution with the solid content of 13 percent;
adding 10.8g of 1% cationic polyacrylamide solution and 3.6g of modified aluminum sulfate flocculation aid solution into the mixed slurry at the same time, continuously stirring for 1min after flocculation occurs, taking supernatant liquid, and detecting by using a turbidimeter to obtain a turbidity value of 20; pouring the flocculated slurry into a mould (220mm multiplied by 220mm), dehydrating in a vacuum suction filtration mode, wherein the vacuum degree of the suction filtration is-0.095 MPa, the suction filtration time is 40s, and leveling and thickness setting are carried out to obtain a wet blank with the length multiplied by 220mm multiplied by 10mm (length multiplied by width multiplied by thickness); drying the wet blank in a blast drying oven at a hot air drying temperature of 130 ℃ for 12 hours to obtain an aluminum silicate fiber stable heat-insulating inorganic board; and additionally weighing 30g of flocs which are not counted by the total mass of the sample and prepared according to the formula, putting the flocs into a measuring cup, adding 500ml of water, starting stirring at the rotating speed of 800rpm, and continuously stirring for 10min to ensure that the water solution becomes turbid and the flocs are scattered.
The stable heat-insulating inorganic board has a volume weight of 330kg/m3Average thermal conductivity at 500 ℃ of 0.126W/(m.k); the compression strength at normal temperature is 0.169MPa, the breaking strength is 0.181MPa, and the floccule can not be broken up within 10min at the rotation speed of 800 r/min.
Example 5
Injecting 9L of deionized water into a stirring container, then adding 113.4g of alumina fiber and starting stirring, wherein the length of the alumina fiber is 1.5cm, and the diameter of the alumina fiber is 3 mu m; then 8.6g of sodium bentonite, 2.78g of needle-shaped wollastonite and 1.85g of zeolite powder are added and fully stirred for 5min to uniformly disperse the slurry, wherein the specific surface area of the sodium bentonite is 170m2The grain size is 8 mu m, the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2/g，The particle size is 12 mu m; 15.12g of fine silica powder, 19g of silicon nitride and 94.5g of neutral silica Sol (SiO)2Solid content 30%), and stirring for 5min to disperse the slurry uniformly.
10ml of industrial water glass solution (modulus 3.3, SiO)226 percent of solid content) and 10ml of deionized water, evenly stirring, then carrying out ion exchange on the diluted water glass solution through styrene cation exchange resin to obtain 20ml of active silicic acid solution, then adding 13g of solid aluminum sulfate into 20ml of active silicic acid solution, fully stirring for 5min, adding 0.04g of KH570 after the solution is clarified, and stirring for 2min to obtain SiO with the pH value of 2.2 and the aluminum sulfate concentration of 40 percent2A transparent modified aluminum sulfate flocculation aid solution with the solid content of 13 percent;
adding 12.8g of 1% cationic polyacrylamide solution and 4.25g of modified aluminum sulfate flocculation aid solution into the mixed slurry at the same time, continuously stirring for 1min after flocculation occurs, taking supernatant liquid, and detecting by using a turbidimeter to obtain a turbidity value of 20; pouring the flocculated slurry into a mould (220mm multiplied by 220mm), dehydrating in a vacuum suction filtration mode, wherein the vacuum degree of the suction filtration is-0.095 MPa, the suction filtration time is 40s, and leveling and thickness setting are carried out to obtain a wet blank with the length multiplied by 220mm multiplied by 10mm (length multiplied by width multiplied by thickness); drying the wet blank in a forced air drying oven at the hot air drying temperature of 130 ℃ for 12 hours to obtain an alumina fiber stable heat-preservation inorganic board; 30g of floccules which are not counted by the total mass of the sample and are prepared according to the formula are additionally weighed and placed into a measuring cup, 500ml of water is added, stirring is started, the rotating speed is 800 r/min, and after stirring is continuously carried out for 10min, the water solution becomes turbid, and the floccules are scattered.
The stable heat-insulating inorganic board has a volume weight of 390kg/m3Average 500 ℃ thermal conductivity 0.124W/(m.k); the compression strength at normal temperature is 0.23MPa, the rupture strength is 0.28MPa, and the floccule can not be broken up within 10min at the rotation speed of 800 r/min.
Comparative example 1
Injecting 8L of deionized water into a stirring container, then adding 96g of aluminum silicate fibers, starting stirring, wherein the length of the aluminum silicate fibers is 1.5cm, and the diameter of the aluminum silicate fibers is 3 mu m; then, 7.28g of sodium bentonite, 2.35g of needle-like wollastonite and 1.57g of zeolite powder were added thereto, and the mixture was sufficiently stirred for 5min, evenly dispersing the slurry, wherein the specific surface area of the sodium bentonite is 170m2Per g, the particle size is 8 mu m, the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2(ii)/g, particle size 12 μm; then 12.8g of fine silica powder, 16g of nano titanium oxide and 80g of neutral silica Sol (SiO) were added2Solid content 30%), and stirring for 5min to disperse the slurry uniformly.
Adding 10.8g of 1% cationic polyacrylamide solution and 1.44g of solid aluminum sulfate into the mixed slurry simultaneously, continuously stirring for 1min after flocculation occurs, taking the upper layer liquid, and detecting by using a turbidimeter to obtain a turbidity value of 120; pouring the flocculated slurry into a mould (220mm multiplied by 220mm), dehydrating in a vacuum suction filtration mode, wherein the vacuum degree of the suction filtration is-0.095 MPa, the suction filtration time is 40s, and leveling and thickness setting are carried out to obtain a wet blank with the length multiplied by 220mm multiplied by 10mm (length multiplied by width multiplied by thickness); drying the wet blank in a blast drying oven at a hot air drying temperature of 130 ℃ for 12 hours to obtain an aluminum silicate fiber stable heat-insulating inorganic board; and additionally weighing 30g of flocs which are not counted by the total mass of the sample and prepared according to the formula, putting the flocs into a measuring cup, adding 500ml of water, starting stirring at the rotating speed of 800rpm, continuously stirring for 50s, enabling the water solution to become turbid, and scattering the flocs.
The stable heat-insulating inorganic board has a volume weight of 290kg/m3Average thermal conductivity at 500 ℃ of 0.132W/(m.k); the compression strength at normal temperature is 0.12MPa, the rupture strength is 0.135MPa, and the floccule can not be broken up within 50s at the rotation speed of 800 r/min.
Comparative example 2
Injecting 8L of deionized water into a stirring container, then adding 96g of aluminum silicate fibers, starting stirring, wherein the length of the aluminum silicate fibers is 1.5cm, and the diameter of the aluminum silicate fibers is 3 mu m; then adding 7.28g of sodium bentonite, 2.35g of needle-shaped wollastonite and 1.57g of zeolite powder, fully stirring for 5min to uniformly disperse the slurry, wherein the specific surface area of the sodium bentonite is 170m2The grain size is 8 mu m, the specific surface area of the needle-shaped wollastonite is 40m2The grain size is 22 mu m, the specific surface area of the zeolite powder is 120m2(ii)/g, particle size 12 μm; then 12.8g of fine silica powder, 16g of nano-titanium oxide and 44g of neutral silica Sol (SiO) were added2The solid content is 30 percent) Stirring for 5min to disperse the slurry uniformly, adding 11g of starch into the mixed slurry, stirring for 1min after flocculation occurs, taking supernatant, and detecting by using a turbidimeter to obtain a turbidity value of 26; pouring the flocculated slurry into a mould (220mm multiplied by 220mm), dehydrating in a vacuum suction filtration mode, wherein the vacuum degree of the suction filtration is-0.095 MPa, the suction filtration time is 40s, and leveling and thickness setting are carried out to obtain a wet blank with the length multiplied by 220mm multiplied by 10mm (length multiplied by width multiplied by thickness); drying the wet blank in a forced air drying oven at the hot air drying temperature of 130 ℃ for 12h to obtain an aluminum silicate fiberboard containing organic matters; and additionally weighing 30g of flocs which are not counted by the total mass of the sample and prepared according to the formula, putting the flocs into a measuring cup, adding 500ml of water, starting stirring at the rotating speed of 800rpm, and continuously stirring for 6min to ensure that the water solution becomes turbid and the flocs are scattered.
The volume weight of the aluminum silicate fiberboard containing the organic matters is 328kg/m3Average thermal conductivity coefficient at 500 ℃ of 0.141W/(m.k); the compression strength at normal temperature is 0.17MPa, the breaking strength is 0.18MPa, and the floccule can not be broken up within 6min at the rotation speed of 800 r/min.
According to the embodiment, the modified flocculating aid in the inorganic board provided by the invention can improve the anti-shearing capacity of the floc, solves the problem that the floc is easy to stir and break up in the production process of the inorganic fiber board, and directly prepares the stable heat-insulating inorganic board through one-step drying without a high-temperature calcination process; the stable heat-insulating inorganic board is smokeless and tasteless when used in a high-temperature environment, and has stable volume weight, mechanical property and heat-insulating property. The experimental results show that: the volume weight of the stable heat-insulating inorganic board prepared by the invention is 300-400 kg/m3(ii) a Its average thermal conductivity at 500 deg.C<0.13W/(m.k); the normal-temperature compressive strength is 0.15-0.25 MPa, and the flexural strength is 0.15-0.3 MPa; can be applied to the heat insulation field of large industrial kiln equipment, pipelines and the like in the industries of petrifaction, metallurgy, electric power and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A stable, thermally insulating inorganic board comprising the following components:
the base material, 0.95-1.05 wt% of cationic polyacrylamide solution and a modified flocculating aid;
the base material comprises inorganic refractory fibers, clay mineral substances, inorganic filler, infrared opacifier and solid components in inorganic binder in a mass ratio of 50-70: 5-8: 6-10: 9-12: 10-20; the mass ratio of the base material to the cationic polyacrylamide solution is 18-22: 1; the mass ratio of the base material to the modified flocculating aid is 55-65: 1;
the length of the inorganic refractory fiber is 0.1-3 cm, and the diameter of the inorganic refractory fiber is 0.5-8 mu m; the specific surface area of the clay mineral is 30-200 m2The particle size is 5-25 mu m;
the modified flocculating aid is prepared from an active silicic acid solution, a flocculating aid and a silane coupling agent; SiO in the active silicic acid solution2The solid content is 5-13%, and the pH value is 2-4; the flocculation auxiliary agent is selected from one or more of ferric chloride, aluminum sulfate and polyaluminium chloride;
the solid content of the flocculation aid in the active silicic acid solution is 20-50%; the solid content of the silane coupling agent in the active silicic acid solution is 0.1-0.3%;
the infrared opacifier is selected from one or more of nano titanium oxide, potassium hexatitanate whisker and silicon nitride;
the clay mineral is selected from at least two of bentonite, zeolite powder, needle-shaped wollastonite, kaolin, sepiolite powder, attapulgite, hydrotalcite powder, dolomite powder, thin diaspore powder and modified coal gangue powder, and the clay mineral necessarily contains bentonite; the bentonite content in the clay mineral is 50-70 wt%; the specific surface area of the bentonite is 168-172 m2The particle size is 7.5-8.5 mu m, and the bentonite is sodium bentonite.
2. The stabilized insulating inorganic board of claim 1, wherein the inorganic refractory fibers are selected from one or more of aluminum silicate fibers, magnesium silicate fibers, high silica fibers, quartz fibers, alumina fibers, polycrystalline mullite fibers;
the inorganic filler is selected from one or more of alumina, aluminum hydroxide, silica micropowder, quartz sand, zircon sand, diatomite, calcium oxide, calcium hydroxide and calcium carbonate;
the inorganic binder is selected from one or more of industrial water glass, acidic silica sol, alkaline silica sol, neutral silica sol and aluminum dihydrogen phosphate solution.
3. The stabilized insulating inorganic board of claim 1, wherein the silane coupling agent is one or more types selected from the group consisting of KH550, KH560 and KH 570.
4. The stable insulated inorganic board of claim 1, wherein the insulated inorganic board has a volume weight of 300 to 400kg/m3(ii) a The average thermal conductivity at 500 ℃ is less than 0.13W/(m.k).
5. A method for preparing a stabilized heat-insulating inorganic board as defined in any one of claims 1 to 4, comprising the steps of:
mixing inorganic refractory fiber, clay mineral substances, inorganic filler, an infrared opacifier, an inorganic bonding agent and water, and fully stirring to obtain slurry; mixing the flocculating aid, the active silicic acid solution and the silane coupling agent, and fully stirring to obtain a modified flocculating aid solution;
mixing the slurry with 0.95-1.05 wt% of cationic polyacrylamide solution and the modified flocculation aid solution, and flocculating to obtain flocculated slurry;
and dehydrating the flocculated slurry to obtain a wet blank, and drying to obtain the stable heat-insulating inorganic board.
6. The preparation method according to claim 5, wherein the drying is hot air drying or microwave drying;
the hot air drying temperature is 120-150 ℃, and the time is 10-15 h;
the microwave drying temperature is 100-130 ℃, and the time is 4-8 h.
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