CN112624778A - High-strength high-density inorganic fiber product and preparation method thereof - Google Patents
High-strength high-density inorganic fiber product and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-strength high-density inorganic fiber product, which comprises the following preparation raw materials: inorganic composite fibers: 20-50 parts by weight; organic fiber: 0.1 to 1 part by weight; refractory filler: 30-60 parts by weight; sintering aid: 1-5 parts by weight; inorganic binder: 5-10 parts by weight; filter aid: 2-8 parts by weight; the inorganic composite fiber comprises the following components in percentage by mass (1-5): (1-5): (1-5) blown ceramic fibers, spun ceramic fibers and soluble fibers. The compressive strength of the ceramic fiber board after being fired is improved to more than 5MPa from the original 2MPa, so that the ceramic fiber board can still keep better performance after being used at high temperature. The invention also provides a preparation method of the high-strength high-density inorganic fiber product.
Description
Technical Field
The invention belongs to the technical field of inorganic heat-insulating materials, and particularly relates to a high-strength high-density inorganic fiber product and a preparation method thereof.
Background
High density ceramic fiber board (volume density 600-1000 kg/m)3) Ceramic fiber, refractory raw materials and organic and inorganic binders are usually produced by a vacuum suction filtration or fourdrinier wire forming production process, and are widely applied to the heat preservation of the industrial kiln back lining.
Existing high density ceramic fiber board (body)Bulk density of 600-1000 kg/m3) The fiber needs to be chopped in advance in the preparation process so that the prepared fiberboard can meet the requirements of density and strength (such as the method disclosed in patent CN 108033756B), but the operation of the process is complex and is not beneficial to the continuous production of the process.
Meanwhile, the mineral fiber raw materials used in the raw materials have smooth surfaces and cannot be wrapped by powder raw materials, so that the fiber raw materials and the added powder raw materials are not uniformly mixed in the preparation process, and further, the problems of nonuniform powder distribution, powder sinking and fiber floating of the molded blank exist, and the product quality is influenced;
the strength of the existing high-density ceramic fiber board is mostly formed by adding an inorganic binder, a large amount of the inorganic binder is needed to be added, meanwhile, the whole board becomes brittle after being calcined for a long time in a high-temperature environment, the surface of the board falls off or even breaks under the action of hot wind erosion, and the board has the problems of low strength after being calcined, lower than 2MPa, insufficient pressure bearing capacity, high use and replacement frequency and high cost.
Disclosure of Invention
The invention provides a high-strength high-density inorganic fiber product and a preparation method thereof.
The invention provides a high-strength high-density inorganic fiber product, which comprises the following preparation raw materials:
inorganic composite fibers: 20-50 parts by weight; organic fiber: 0.1 to 1 part by weight; refractory filler: 30-60 parts by weight; sintering aid: 1-5 parts by weight; inorganic binder: 5-10 parts by weight; filter aid: 2-8 parts by weight;
the inorganic composite fiber comprises the following components in percentage by mass (1-5): (1-5): (1-5) blown ceramic fibers, spun ceramic fibers and soluble fibers.
Preferably, the average diameter of the blown ceramic fiber is 2-4 μm, and the average length is 10-50 mm;
the average diameter of the spinning ceramic fiber is 3-5 mu m, and the average length of the spinning ceramic fiber is 100-200 mm.
Preferably, the soluble fibers comprise soluble magnesium silicate fibers and/or soluble calcium silicate fibers.
Preferably, the organic fibers are pretreated wood pulp fibers;
the pretreatment is to soak and disperse wood pulp fibers in water.
Preferably, the wood pulp fiber is soaked in water for 5-15 min.
Preferably, the refractory filler is a mixture of two or more of high bauxite, pyrophyllite, mullite powder and calcined alumina powder.
Preferably, the sintering aid is one or more of potassium feldspar, calcium oxide and magnesium oxide.
Preferably, the inorganic binder is silica sol, and the mass concentration of the silica sol is 5-40 wt%.
Preferably, the high-strength high-density inorganic fiber product has a compressive strength of 4 to 15MPa and a bulk density of 600 to 1000kg/m3。
The present invention provides a method for preparing a high strength and high density inorganic fiber product as described above, comprising the steps of:
A) sequentially adding the throwing ceramic fiber, the organic fiber, the blowing ceramic fiber and the soluble fiber into water, and dispersing to obtain fiber slurry;
B) mixing a refractory filler, a sintering aid and an inorganic binder with the fiber slurry to obtain a mixed slurry with the mass concentration of 1-12%;
C) and adding a filter aid into the mixed slurry for flocculation, forming a wet blank from the flocculated slurry, and drying to obtain the high-strength high-density inorganic fiber product.
The invention provides a high-strength high-density inorganic fiber product, which comprises the following preparation raw materials: inorganic composite fibers: 20-50 parts by weight; organic fiber: 0.1 to 1 part by weight; refractory filler: 30-60 parts by weight; sintering aid: 1-5 parts by weight; inorganic binder: 5-10 parts by weight; filter aid: 2-8 parts by weight; the inorganic composite fiber comprises the following components in percentage by mass (1-5): (1-5): (1-5) blown ceramic fibers, spun ceramic fibers and soluble fibers. According to the invention, inorganic composite fibers are adopted, the ratio is optimized (blowing ceramic fibers, throwing ceramic fibers and soluble fibers), and the fibers are prevented from being chopped in advance by improving the feeding sequence, so that the link of raw material pretreatment is reduced; after being pretreated, the organic fibers and the inorganic composite fibers are used as raw materials, so that the fibers have good wrapping capacity on refractory fillers, and further, powder and the fiber raw materials are uniformly mixed, the uniformity of slurry in the preparation process is improved, the uniformity of a formed blank is improved, and the finished product rate of the product is improved to more than 95%; adding sintering aid/micropowder and regulating and controlling the proportion, forming a specific crystalline phase at a specific temperature in the sintering process so as to reduce the content of the inorganic binder and multiply increase the strength and density of the product. Experimental results show that the compressive strength of the ceramic fiber board after being fired is improved to more than 5MPa from the original 2MPa, so that the ceramic fiber board can still keep better performance after being used at high temperature.
Detailed Description
The invention provides a high-strength high-density inorganic fiber product, which comprises the following preparation raw materials:
inorganic composite fibers: 20-50 parts by weight; organic fiber: 0.1 to 1 part by weight; refractory filler: 30-60 parts by weight; sintering aid: 1-5 parts by weight; inorganic binder: 5-10 parts by weight; filter aid: 2-8 parts by weight;
the inorganic composite fiber comprises the following components in percentage by mass (1-5): (1-5): (1-5) blown ceramic fibers, spun ceramic fibers and soluble fibers.
In the present invention, the inorganic composite fiber is preferably 20 to 50 parts by weight, more preferably 25 to 45 parts by weight, such as 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts or 50 parts by weight, and preferably a range value in which any of the above values is an upper limit or a lower limit.
In the invention, the inorganic composite fiber preferably comprises a spinning ceramic fiber, a blowing ceramic fiber and a soluble fiber, wherein the mass ratio of the spinning ceramic fiber to the blowing ceramic fiber to the soluble fiber is (1-5): (1-5): (1-5), wherein the parts of the spinning ceramic fibers can be 1 part, 2 parts, 3 parts, 4 parts or 5 parts within the above proportion range; the parts of the blown ceramic fibers can be 1 part, 2 parts, 3 parts, 4 parts or 5 parts, and the parts of the soluble fibers can be 1 part, 1.2 parts, 1.6 parts, 1.7 parts, 2 parts, 3 parts, 4 parts or 5 parts; preferably, the ratio of the three fibers is any value of the number of the fibers.
In the invention, the blowing ceramic fiber is prepared by adopting a blowing mode, the blowing mode can adopt the existing process in the prior art, the blowing ceramic fiber has the characteristics of thin fiber diameter and short fiber length, the average diameter is 2-4 mu m, the average length is 10-50 mm, and the main component is Al2O3、SiO2；
The spinning ceramic fiber is prepared by a spinning mode, the spinning mode can adopt the existing process in the prior art, the spinning ceramic fiber has the characteristics of long fiber, thick fiber diameter and high strength, the diameter of the fiber is 3-5 mu m, the average length of the fiber is 100-200 mm, and the main component of the fiber is Al2O3、SiO2；
The soluble fiber comprises soluble magnesium silicate fiber and soluble calcium silicate fiber.
The invention improves the interweaving strength between the fibers in the slurry by utilizing the difference between the fiber length and the fiber diameter of the injected fibers and the melt-spun fibers, thereby realizing no short-cut processing pretreatment of the fibers and reducing the resilience of the wet blank after compression molding.
In the present invention, the organic fiber is preferably wood pulp fiber, and the weight part of the wood pulp fiber is preferably 0.1 to 1 part, such as 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, and is preferably a range value with any of the above values as an upper limit or a lower limit.
According to the invention, the organic fibers are preferably subjected to soaking pretreatment in water for 5-15 min, and are uniformly dispersed by using equipment. The purpose of pretreating the inorganic fiber is to improve the wrapping capacity of the organic fiber on the powdery refractory filler, further improve the uniform mixing degree of the fiber raw material and the powder and improve the product quality.
In the invention, the refractory filler is preferably a mixture of two or more of high bauxite, pyrophyllite, mullite powder and calcined alumina powder; the weight portion of the refractory filler is preferably 30 to 60 portions, such as 30 portions, 31 portions, 32 portions, 33 portions, 34 portions, 35 portions, 36 portions, 37 portions, 38 portions, 39 portions, 40 portions, 41 portions, 42 portions, 43 portions, 44 portions, 45 portions, 46 portions, 47 portions, 48 portions, 49 portions, 50 portions, 51 portions, 52 portions, 53 portions, 54 portions, 55 portions, 56 portions, 57 portions, 58 portions, 59 portions or 60 portions, and preferably any value is a range with an upper limit or a lower limit.
The sintering aid is preferably one or more of potash feldspar, calcium oxide and magnesium oxide, and the addition of the sintering aid is favorable for forming the combination between powder (accompanied by one or more of cordierite phase, anorthite phase and cristobalite phase) with mullite phase as the main crystal phase and fibers in the sintering process, so that the strength and the density of the product are greatly increased finally. The weight portion of the sintering aid is preferably 1 to 5 portions, such as 1 portion, 2 portions, 3 portions, 4 portions or 5 portions, and preferably any value is a range value with an upper limit or a lower limit.
The inorganic binder is preferably silica sol, the mass concentration of the silica sol is preferably 5-40%, more preferably 10-30%, such as 5%, 10%, 15%, 20%, 25%, 30%, 35% or 40%, and preferably a range value with any value of the above as an upper limit or a lower limit; in the present invention, the weight part (in terms of solid content) of the silica sol is preferably 5 to 10 parts, such as 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, and preferably a range value in which any of the above values is an upper limit or a lower limit.
In the present invention, the filter aid is preferably cationic starch or a combination of cationic starch and polyacrylamide. When the cationic starch and the polyacrylamide are combined, the mass of the polyacrylamide is preferably 1 to 5 weight percent, and preferably 2 to 4 weight percent of the mass of the cationic starch. The filter aid is preferably 2 to 8 parts by weight, such as 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts by weight, and is preferably a range value with any value as an upper limit or a lower limit.
The invention also provides a preparation method of the high-strength high-density inorganic fiber product, which comprises the following steps:
A) under the stirring condition, sequentially adding the throwing ceramic fiber, the organic fiber, the blowing ceramic fiber and the soluble fiber into water, and dispersing to obtain fiber slurry;
B) mixing refractory filler, sintering aid and inorganic binder with the fiber slurry to obtain mixed slurry;
C) and adding a filter aid into the mixed slurry for flocculation, forming a wet blank from the flocculated slurry, and drying to obtain the high-strength high-density inorganic fiber product.
In the invention, the feeding sequence of the inorganic composite fiber is that firstly the throwing ceramic fiber is added, then the organic fiber is added, then the blowing ceramic fiber is added, and finally the soluble fiber is added. The addition mode is beneficial to interweaving different fibers, because the spun ceramic fiber is long, the spun ceramic fiber is firstly added into water to be scattered, so that the spun ceramic fiber is uniformly dispersed, and the soluble fiber is finally added because the soluble fiber is brittle.
In the present invention, the types, sources and usage amounts of the spinning ceramic fibers, organic fibers, blowing ceramic fibers and soluble fibers are the same as those of the spinning ceramic fibers, organic fibers, blowing ceramic fibers and soluble fibers, and thus are not described herein again.
In the present invention, the types, sources and usage amounts of the refractory filler, the sintering aid and the inorganic binder are the same as those of the refractory filler, the sintering aid and the inorganic binder, and are not described herein again.
The mass concentration of the resulting mixed slurry is preferably 1 to 12%, more preferably 3 to 10%, such as 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, or 12%, and is preferably a range value having any of the above values as an upper limit or a lower limit.
After the mixed slurry is obtained, the filter aid is added into the mixed slurry to assist in filtration, so that the inorganic composite fiber, the organic fiber, the refractory filler, the sintering aid and the inorganic binding agent are flocculated together, and water is clear;
and then, carrying out vacuum suction filtration, long net shoveling or grouting forming on the flocculated slurry, pressing to obtain a wet blank with a corresponding thickness, conveying the wet blank into a drying chamber for drying, and finishing to obtain a product after drying.
In the present invention, the flocculation slurry is formed by a forming method commonly used in the art. The volume density of the dried product reaches 600-1000 kg/m3. The thickness of the wet blank is 1-1.2 times of the thickness of the dried product, and the water content is 40-60 wt%.
The high-density ceramic fiber board prepared by the method does not need to be chopped in advance in the preparation process, so that the process is simplified; by adding the organic fiber, the uniformity of slurry in the preparation process is improved, the uniformity of the formed blank is improved, and the yield of the product is improved to more than 95%.
Meanwhile, by adding the sintering aid/micro powder and regulating the proportion, the ceramic fiber board forms a specific crystal phase (the packing and the glass-state fiber generate a mullite phase as a main crystal phase under the action of the sintering aid, and are accompanied with one or more crystal phases of a cordierite phase, an anorthite phase and a cristobalite phase, and the generated crystal phase is combined with the fiber to ensure that the product has a compact structure and increased strength), and further, under the condition of reducing the dosage of the inorganic binder, the compressive strength of the ceramic fiber board after being fired is increased from the original 2MPa to more than 5MPa, so that the ceramic fiber board can still keep better performance after being used at high temperature (the problems of fiber pulverization, collapse and falling off and the like after being used at high temperature by a common high-density ceramic fiber board).
In order to further illustrate the present invention, the following examples are provided to describe a high strength and high density inorganic fiber product and a method for preparing the same in detail, but should not be construed as limiting the scope of the present invention.
Example 1
(1) Soaking 8kg of organic fiber in water, and uniformly dispersing by using a dispersion machine for later use;
(2) 200kg of throwing ceramic fiber is added into water for dispersion, then organic fiber is added, 50kg of blowing ceramic fiber is added, and finally 80kg of soluble fiber is added for uniform dispersion;
(3) adding 200kg of high-alumina bauxite, 200kg of pyrophyllite and 30kg of potassium feldspar into water, then adding 200kg of 30% silica sol, and finally adding 40kg of cationic starch, and uniformly mixing to ensure that the water is clear;
(4) and (3) forming the flocculated slurry in a vacuum suction filtration mode, pressing the slurry to a wet blank with certain thickness and density, conveying the wet blank to a drying chamber for drying, and finishing the dried blank into a product.
The volume density of the prepared high-strength high-density inorganic fiber product is 900kg/m3The compressive strength was 11MPa, and the compressive strength after firing was 11.5 MPa. By adding the sinterable filler at high temperature, the high-temperature strength of the product is improved, and the strength of the product after sintering at high temperature is improved compared with that of the product at normal temperature.
The production yield is 96 percent, 10 blocks of the produced high-strength high-density inorganic fiber product with the specification of 600 multiplied by 20mm and the weight shown in table 1 are taken (according to 900 kg/m)3Production, theoretical weight of each article 6.48 kg):
table 1 deviation in density of the product of example 1 of the invention
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Weight kg | 6.55 | 6.53 | 6.60 | 6.48 | 6.35 | 6.50 | 6.51 | 6.40 | 6.60 | 6.37 |
| Deviation% | +1.08 | +0.77 | +1.85 | 0 | -2.01 | +0.02 | +0.46 | -1.23 | +1.85 | -1.70 |
It can be seen that the high density inorganic fiber product has a small average deviation value of the density, indicating that the uniformity of the slurry during the preparation process is good.
Example 2
(1) Soaking 7kg of organic fiber in water, and uniformly dispersing by using a dispersion machine for later use;
(2) 60kg of throwing ceramic fiber is added into water for dispersion, then organic fiber is added, 180kg of blowing ceramic fiber is added, and finally 100kg of soluble fiber is added for uniform dispersion;
(3) adding 150kg of high-alumina bauxite, 200kg of synthetic mullite powder and 40kg of potassium feldspar into water, then adding 250kg of silica sol with the concentration of 20%, and finally adding 50kg of cationic starch, and uniformly mixing to ensure that the water is clear;
(4) and (3) forming the flocculated slurry in a long net shoveling mode, pressing to form a wet blank with a certain thickness and density, conveying to a drying chamber for drying, and finishing to obtain a product after drying.
The volume density of the prepared high-strength high-density inorganic fiber product is 630kg/m3The compressive strength was 4.5MPa and 5.3MPa after firing.
The production yield is 98%, 10 blocks of the produced high-strength high-density inorganic fiber product with the specification of 1000X 30mm and the weight shown in Table 2 (according to 630 kg/m)3Production, theoretical weight of each article 18.9 kg):
table 2 deviation in density of the product of example 2 of the present invention
It can be seen that the high density inorganic fiber product has a small average deviation value of the density, indicating that the uniformity of the slurry during the preparation process is good.
The homogeneity of the slurry is better.
Comparative example 1: (addition of spun ceramic fiber only)
(1) Soaking 7kg of organic fiber in water, and uniformly dispersing by using a dispersion machine for later use;
(2) adding 240kg of spinning ceramic fibers into water for dispersion, then adding organic fibers, and finally adding 100kg of soluble fibers for uniform dispersion;
(3) adding 150kg of high-alumina bauxite, 200kg of synthetic mullite powder and 40kg of potassium feldspar into water, then adding 250kg of silica sol with the concentration of 20%, and finally adding 50kg of cationic starch, and uniformly mixing to ensure that the water is clear;
(4) and (3) forming the flocculated slurry in a long net shoveling mode, pressing to form a wet blank with a certain thickness and density, conveying to a drying chamber for drying, and finishing to obtain a product after drying.
The volume density of the prepared high-strength high-density inorganic fiber product is 630kg/m3Compressive strength 3.0MPa, and compressive strength after firing 3.2 MPa.
The production yield is 92%, 10 blocks of the produced high-strength high-density inorganic fiber product with the specification of 1000X 30mm and the weight shown in Table 3 (according to 630 kg/m)3Production, theoretical weight of each article 18.9 kg):
TABLE 3 Density deviations of the products of comparative example 1 according to the invention
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Weight kg | 19.89 | 20.0 | 19.5 | 19.8 | 18.3 | 17.8 | 18.0 | 19.5 | 19.7 | 18.2 |
| Deviation% | +5.24 | +5.82 | +3.17 | +4.76 | -3.17 | --5.82 | -4.76 | +3.17 | +4.23 | -3.70 |
As can be seen from Table 3, the average deviation value of the density of the high-density inorganic fiber product was relatively large.
COMPARATIVE EXAMPLE 2 (without organic fiber)
(1) 60kg of throwing ceramic fiber is added into water for dispersion, then 180kg of blowing ceramic fiber is added, and finally 100kg of soluble fiber is added for uniform dispersion;
(2) adding 150kg of high-alumina bauxite, 200kg of synthetic mullite powder and 40kg of potassium feldspar into water, then adding 250kg of silica sol with the concentration of 20%, and finally adding 50kg of cationic starch, and uniformly mixing to ensure that the water is clear;
(3) and (3) forming the flocculated slurry in a long net shoveling mode, pressing to form a wet blank with a certain thickness and density, conveying to a drying chamber for drying, and finishing to obtain a product after drying.
The volume density of the prepared high-strength high-density inorganic fiber product is 630kg/m3Compressive strength of 3.6MPa and compressive strength after firing of 3.8MPa
The production yield is 90%, 10 blocks of the produced high-strength high-density inorganic fiber product with the specification of 1000X 30mm and the weight shown in Table 4 (according to 630 kg/m)3Production, theoretical weight of each article 18.9 kg):
table 4 deviation in density of the product of comparative example 2 of the present invention
| Numbering | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Weight kg | 20.5 | 17.5 | 20.2 | 20.3 | 20.8 | 19.9 | 18.4 | 17.0 | 20.0 | 19.5 |
| Deviation% | +8.47 | -7.41 | +6.88 | +7.41 | +10.05 | +5.29 | -2.65 | -10.05 | +5.82 | +3.17 |
As can be seen from Table 4, the compressive strength of the product prepared in this comparative example was improved as compared with the single fiber in comparative example 1, but the dispersion property was lowered and the average deviation of the density was relatively large.
Comparative example 3 (No pretreatment of organic fiber)
(1) 60kg of throwing ceramic fiber is added into water for dispersion, then untreated organic fiber is added, 180kg of blowing ceramic fiber is added, and finally 100kg of soluble fiber is added for uniform dispersion;
(2) adding 150kg of high-alumina bauxite, 200kg of synthetic mullite powder and 40kg of potassium feldspar into water, then adding 250kg of silica sol with the concentration of 20%, and finally adding 50kg of cationic starch, and uniformly mixing to ensure that the water is clear;
(3) and (3) forming the flocculated slurry in a long net shoveling mode, pressing to form a wet blank with a certain thickness and density, conveying to a drying chamber for drying, and finishing to obtain a product after drying.
The volume density of the prepared high-strength high-density inorganic fiber product is 630kg/m3Compressive strength of 3.7MPa and compressive strength after firing of 4.0MPa
The production yield is 91%, 10 blocks of the produced high-strength high-density inorganic fiber product with the specification of 1000X 30mm and the weight shown in Table 5 (according to 630 kg/m)3Production, theoretical weight of each productAmount 18.9 kg):
TABLE 5 Density deviations of the product of comparative example 3 according to the invention
It can be seen that although the organic fiber had a certain dispersion effect, the comparative example did not pretreat the organic fiber, and the density deviation value thereof did not meet the standard.
Comparative example 4 (without sintering aid)
(1) Soaking 7kg of organic fiber in water, and uniformly dispersing by using a dispersion machine for later use;
(2) 60kg of throwing ceramic fiber is added into water for dispersion, then organic fiber is added, 180kg of blowing ceramic fiber is added, and finally 100kg of soluble fiber is added for uniform dispersion;
(3) adding 150kg of high-alumina bauxite and 200kg of synthetic mullite powder into water, then adding 250kg of silica sol with the concentration of 20%, and finally adding 50kg of cationic starch, and uniformly mixing to ensure that the water is clear;
(4) and (3) forming the flocculated slurry in a long net shoveling mode, pressing to form a wet blank with a certain thickness and density, conveying to a drying chamber for drying, and finishing to obtain a product after drying.
The volume density of the prepared high-strength high-density inorganic fiber product is 630kg/m3The compressive strength is 4.2MPa, the compressive strength after firing is 1.8MPa, and the problem of powder falling can also occur.
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 (10)
1. A high-strength high-density inorganic fiber product comprises the following preparation raw materials:
inorganic composite fibers: 20-50 parts by weight; organic fiber: 0.1 to 1 part by weight; refractory filler: 30-60 parts by weight; sintering aid: 1-5 parts by weight; inorganic binder: 5-10 parts by weight; filter aid: 2-8 parts by weight;
the inorganic composite fiber comprises the following components in percentage by mass (1-5): (1-5): (1-5) blown ceramic fibers, spun ceramic fibers and soluble fibers.
2. The high-strength high-density inorganic fiber product according to claim 1, wherein the average diameter of the blown ceramic fiber is 2 to 4 μm, and the average length is 10 to 50 mm;
the average diameter of the spinning ceramic fiber is 3-5 mu m, and the average length of the spinning ceramic fiber is 100-200 mm.
3. The high strength, high density inorganic fibrous article of claim 1 wherein the soluble fibers comprise soluble magnesium silicate fibers and/or soluble calcium silicate fibers.
4. The high strength, high density inorganic fibrous article of claim 1 wherein the organic fibers are pre-treated wood pulp fibers;
the pretreatment is to soak and disperse wood pulp fibers in water.
5. The high strength high density inorganic fiber product of claim 4, wherein the wood pulp fiber is soaked in water for 5 to 15 min.
6. The high-strength high-density inorganic fiber product according to claim 1, wherein said refractory filler is a mixture of two or more of high-alumina bauxite, pyrophyllite, mullite powder and calcined alumina powder.
7. The high strength, high density inorganic fiber product of claim 1, wherein the sintering aid is one or more of potassium feldspar, calcium oxide, and magnesium oxide.
8. The high-strength high-density inorganic fiber product according to claim 1, wherein the inorganic binder is silica sol, and the mass concentration of the silica sol is 5 to 40 wt%.
9. The high-strength high-density inorganic fiber product according to claim 1, wherein the high-strength high-density inorganic fiber product has a compressive strength of 4 to 15MPa and a bulk density of 600 to 1000kg/m3。
10. The method for producing a high-strength high-density inorganic fiber product according to any one of claims 1 to 9, comprising the steps of:
A) sequentially adding the throwing ceramic fiber, the organic fiber, the blowing ceramic fiber and the soluble fiber into water, and dispersing to obtain fiber slurry;
B) mixing a refractory filler, a sintering aid and an inorganic binder with the fiber slurry to obtain a mixed slurry with the mass concentration of 1-12%;
C) and adding a filter aid into the mixed slurry for flocculation, forming a wet blank from the flocculated slurry, and drying to obtain the high-strength high-density inorganic fiber product.
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| CN115679746A (en) * | 2022-11-02 | 2023-02-03 | 山东鲁阳节能材料股份有限公司 | Soluble fiber paper and preparation method thereof |
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