CN108675723B - High-density fireproof fiber floor and preparation method thereof - Google Patents
High-density fireproof fiber floor and preparation method thereof Download PDFInfo
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- CN108675723B CN108675723B CN201810591457.2A CN201810591457A CN108675723B CN 108675723 B CN108675723 B CN 108675723B CN 201810591457 A CN201810591457 A CN 201810591457A CN 108675723 B CN108675723 B CN 108675723B
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
Abstract
The invention provides a high-density fireproof fiber floor and a preparation method thereof, wherein the high-density fireproof fiber floor comprises the following raw materials: 30-40 parts of bentonite tailings, 30-40 parts of fly ash, 15-25 parts of Portland cement, 8-15 parts of wood fiber, 3-6 parts of silane coupling agent and 5-10 parts of flame retardant; the fire retardant is a granular polytetrafluoroethylene red phosphorus-coated microcapsule fire retardant. The high-density fireproof fiber floor provided by the invention fully utilizes various waste materials and mineral resources, has the fireproof grade of A1 grade, has the advantages of insect prevention, environmental protection, high strength, long service life, difficult cracking, easy construction and the like, and can be used for steel structure outer walls, steel structure floors and the like of high-grade buildings.
Description
Technical Field
The invention belongs to the technical field of building materials, particularly relates to a fiber floor slab, and particularly relates to a high-density fireproof fiber floor slab taking bentonite fly ash as a main raw material and a preparation method thereof.
Background
The fiber reinforced cement board (cement board for short) is a cement slab for building produced with fiber and cement as main raw materials and is widely applied to various fields of building industry due to its excellent performance. The fiber reinforced cement board is divided by density: the low density is 0.9-1.2g/cm3, the medium density is 1.2-1.5g/cm3, the high density is 1.5-2.0g/cm3, the low density is generally used for the parts such as a low-grade building ceiling partition wall, the medium density is generally used for a middle-grade building partition wall ceiling, and the high density is generally used for a steel structure outer wall, a steel structure floor slab and the like of a high-grade building.
The fly ash is the main solid waste discharged by coal-fired power plants, and along with the development of the power industry, the discharge amount of the fly ash of the coal-fired power plants is increased year by year, so that the fly ash becomes one of the industrial waste residues with larger discharge capacity in China. A large amount of fly ash can generate dust without treatment, thereby polluting the atmosphere; if discharged into a water system, the river can be silted, and toxic chemicals in the river can cause harm to human bodies and organisms. A large amount of bentonite ores are stacked around Jiangxi Leping, so that a large amount of land resources are occupied, and potential safety hazards such as collapse and landslide exist in the stacked bentonite tailings. How to reuse the waste resources and change waste into valuable becomes a problem to be solved urgently.
Although the inorganic mineral material contains a certain amount of aluminum oxide, the inorganic mineral material has a certain fireproof effect, and in order to further improve the fireproof grade of the cement board, a certain flame retardant can be considered to be added. The inorganic flame retardant has the characteristics of good thermal stability, non-volatility, lasting effect, low price and the like, but the addition amount is higher, and the organic flame retardant cannot meet the requirement of environmental protection. Red phosphorus is a better flame retardant, has the advantages of small addition amount, high flame retardant efficiency, low smoke, low toxicity, wide application and the like, but the direct addition of red phosphorus is easy to oxidize and absorb moisture, and influences other properties and service life of the cement board.
Disclosure of Invention
The invention develops a high-density fireproof fiber floor slab, fully utilizes various waste materials and mineral resources, has the fireproof grade of A1 grade, has the advantages of insect prevention, environmental protection, high strength, long service life, difficult cracking, easy construction and the like, and can be used for steel structure outer walls, steel structure floor slabs and the like of high-grade buildings.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a high density fire prevention fibre floor, high density fire prevention fibre floor raw materials includes: 30-40 parts of bentonite tailings, 30-40 parts of fly ash, 15-25 parts of Portland cement, 8-15 parts of wood fiber, 3-6 parts of silane coupling agent and 5-10 parts of flame retardant;
the flame retardant is prepared by the following method:
adding red phosphorus and a dispersing agent into 40-60 wt% of polytetrafluoroethylene emulsion, stirring and mixing uniformly, and performing spray drying to obtain a polytetrafluoroethylene-coated red phosphorus flame retardant;
the mass ratio of the red phosphorus to the dispersing agent to the 40-60 wt% of polytetrafluoroethylene emulsion is 1: 0.1-0.3: 15 to 20.
Red phosphorus is a better flame retardant, has the advantages of small addition amount, high flame retardant efficiency, low smoke, low toxicity, wide application and the like, but the direct addition of red phosphorus is easy to oxidize and absorb moisture, and influences other properties and service life of the cement board. Therefore, red phosphorus, a dispersing agent and 40-60 wt% of polytetrafluoroethylene emulsion are uniformly mixed to prepare uniformly dispersed suspension, and then the suspension is subjected to high-temperature spray drying to prepare the granular polytetrafluoroethylene-coated red phosphorus microcapsule flame retardant. The dispersing agent helps the red phosphorus to be uniformly dispersed in the polytetrafluoroethylene emulsion. The granular microcapsule flame retardant can be uniformly dispersed in inorganic mineral materials, has high stability and has higher flame-retardant and fireproof effects.
Preferably, the high-density fireproof fiber floor slab raw material comprises: 35 parts of bentonite tailings, 35 parts of fly ash, 20 parts of portland cement, 10 parts of wood fiber, 5 parts of a silane coupling agent and 8 parts of a flame retardant.
Preferably, the preparation method of the wood fiber comprises the following steps:
and (2) crushing and grinding the waste kraft paper bags and/or the waste paper boxes and/or the waste packaging paper, cooling for 20-40 minutes at-15 to-20 ℃, grinding and defibering to remove coarse fibers, introducing ammonia gas into the obtained slurry, adjusting the pH of the slurry to 8-9, and pulping to obtain the wood fibers.
After the ground carton material is cooled at low temperature, the extension of wood fiber is facilitated, and the binding force with slag materials is increased, so that the strength of the fiber cement board is improved. The pulping process of the slurry needs to be carried out under an alkaline condition, and the pH value of the slurry is usually adjusted by strong alkali such as sodium hydroxide, but the strength of the cement board is reduced because calcium silicate is easy to carry out ion exchange with the sodium hydroxide to generate sodium silicate. Therefore, the invention selects ammonia gas to adjust the pH value of the slurry, and solves the technical problem.
Preferably, the silane coupling agent is isobutyl triethoxysilane, vinyl triethoxysilane or vinyl trimethoxysilane. The addition of the silane coupling agent is beneficial to improving the compatibility of the microcapsule flame retardant and the inorganic mineral material and improving the product strength.
Preferably, the dispersant is polyethylene glycol with the molecular weight of 400-600.
Preferably, the length of the wood fiber is 8-12 mm.
The second purpose of the invention is to provide a preparation method of a high-density fireproof fiber floor slab, which comprises the following steps:
(1) preparing wood fiber: crushing and grinding waste kraft paper bags and/or waste cartons and/or waste packaging paper, cooling at-15 to-20 ℃ for 20-40 minutes, grinding, defibering to remove crude fibers, introducing ammonia gas into the obtained slurry, adjusting the pH of the slurry to 8-9, and pulping to obtain the wood fibers;
(2) preparation of a silane coupling agent solution: and (2) mixing the following components in percentage by mass: 75: 10, stirring and uniformly mixing the silane coupling agent, ethanol and water to obtain a silane coupling agent solution;
(3) adding red phosphorus and a dispersing agent into 40-60 wt% of polytetrafluoroethylene emulsion, stirring and mixing uniformly, and performing spray drying to obtain a polytetrafluoroethylene-coated red phosphorus flame retardant;
(4) preparing a slab slurry: and grinding and sieving the bentonite tailings and the fly ash to obtain a material with the particle size of 120-200 meshes. Mixing the treated bentonite tailings, fly ash, portland cement, the wood fiber prepared in the step (1), the silane coupling agent solution obtained in the step (2) and the flame retardant prepared in the step (3) according to a ratio to prepare mixed slurry, adding water, and continuously stirring and uniformly mixing to obtain board blank slurry; and (3) the silane coupling agent and hydroxyl of the inorganic mineral material form a hydrogen bond structure, so that the compatibility of the inorganic mineral material and the flame retardant in the step (3) can be improved.
(5) Manufacturing a plate blank: filtering the plate blank slurry obtained in the step (2) by using coarse cotton cloth, filtering to remove 70-80% of water, pressing into a plate blank by using a 7000 ton press, and demolding;
(6) steaming the plate blank: pre-curing the plate blank sprayed with the silane coupling agent solution at room temperature for 8-10 hours, placing the plate blank into a steam curing kettle for steam curing, drying, dehydrating, edging and chamfering to obtain the finished product of the high-density fireproof fiber floor slab.
Preferably, the mass ratio of the red phosphorus, the dispersing agent and the 40-60 wt% of polytetrafluoroethylene emulsion in the step (3) is 1: 0.1-0.3: 15-20, wherein the dispersing agent is polyethylene glycol with the molecular weight of 400-600.
Preferably, the mass ratio of the bentonite tailings, the fly ash, the portland cement, the wood fiber, the silane coupling agent solution and the flame retardant in the step (4) is 30-40: 30-40: 15-25: 8-15: 20-40: 5 to 10.
Preferably, the steam curing specific process parameters in the step (6) are normal pressure, room temperature to 80 ℃, the heating rate of 5 ℃/min and the heat preservation for 3 hours; the temperature is increased at the rate of 8 ℃/min to be 80-130 ℃, and the temperature is kept for 3 hours; and (4) keeping the temperature for 4 hours at 130-180 ℃, wherein the heating rate is 10 ℃/min. The adoption of the temperature programming method for steam curing is beneficial to fully eliminating the internal stress of the fireproof cement board, improving the product strength and reducing the cracking rate.
The invention has the beneficial effects that:
1. the high-density fireproof fiber floor provided by the invention makes full use of various waste materials and mineral resources, changes waste into valuable, effectively reduces environmental pollution, reduces waste of land resources, and has good social and economic benefits.
2. The high-density fireproof fiber floor provided by the invention has the fireproof grade A1 grade, has the advantages of insect prevention, environmental protection, high strength, long service life, difficulty in cracking, easiness in construction and the like, and can be used for steel structure outer walls, steel structure floors and the like of high-grade buildings.
3. The invention adopts the self-made microcapsule red phosphorus as the flame retardant, and has the advantages of small addition amount, good fireproof effect, no toxicity, no smoke, easy dispersion and the like.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments.
A large amount of bentonite tailings are arranged around Jiangxi Jingdezhen, and the bentonite tailings comprise the following main components: SiO 22 82.21%，Al2O311.22%，Fe2O3 1.73%，TiO2 0.28%，CaO 0.02%，MgO 0.06%，K2O 0.34%，Na20.02 percent of O and 4.06 percent of ignition loss. A certain thermal power factory discharges a large amount of fly ash, pollutes the environment, through detecting, its main component is: SiO 22 53.77%，Al2O3 27.47%，Fe2O3 3%，TiO2 0.08%，CaO 1.12%，MgO 1.09%，K2O 2.12%，Na2O 0.20%，SO31.54 percent and 9.22 percent loss on ignition.
Example 1
The high-density fireproof fiber floor slab comprises the following components: 35 parts of bentonite tailings, 35 parts of fly ash, 20 parts of portland cement, 10 parts of wood fiber, 5 parts of isobutyl triethoxysilane and 8 parts of a flame retardant.
The method for preparing the high-density fireproof fiber floor slab comprises the following steps:
(1) preparing wood fiber: crushing and grinding waste kraft paper bags and/or waste cartons and/or waste packaging paper, cooling at-20 ℃ for 20 minutes, grinding and defibering to remove crude fibers, introducing ammonia gas into the obtained slurry, adjusting the pH of the slurry to 8, and pulping to obtain the wood fibers;
(2) preparation of a silane coupling agent solution: and (2) mixing the following components in percentage by mass: 75: 10, stirring and uniformly mixing isobutyl triethoxy silane, ethanol and water to prepare a silane coupling agent solution;
(3) mixing the components in a mass ratio of 1: 0.2: 15, adding the red phosphorus and the polyethylene glycol 400 into 40wt% of polytetrafluoroethylene emulsion, stirring and mixing uniformly, and then carrying out spray drying to obtain the polytetrafluoroethylene-coated red phosphorus flame retardant;
(4) preparing a slab slurry: and grinding and sieving the bentonite tailings and the fly ash to obtain a material with the particle size of 120-200 meshes. Mixing 35g of treated bentonite tailings, 35g of fly ash, 20g of portland cement, 10g of wood fiber prepared in the step (1), 34g of silane coupling agent solution obtained in the step (2) and 8g of flame retardant prepared in the step (3) to prepare mixed slurry, adding water, and continuously stirring and uniformly mixing to obtain board blank slurry;
(5) manufacturing a plate blank: filtering the plate blank slurry obtained in the step (2) by using coarse cotton cloth, filtering to remove 70-80% of water, pressing into a plate blank by using a 7500-ton press, and demolding;
(6) steaming the plate blank: pre-curing the plate blank sprayed with the silane coupling agent solution at room temperature for 9 hours, putting the plate blank into a steam curing kettle for steam curing, drying, dehydrating, edging and chamfering to obtain the finished product of the high-density fireproof fiber floor slab. The specific technological parameters of the steam curing are normal pressure, room temperature to 80 ℃, the heating rate of 5 ℃/min and the heat preservation for 3 hours; the temperature is increased at the rate of 8 ℃/min to be 80-130 ℃, and the temperature is kept for 3 hours; and (4) keeping the temperature for 4 hours at 130-180 ℃, wherein the heating rate is 10 ℃/min.
Example 2
The high-density fireproof fiber floor slab comprises the following components: 30 parts of bentonite tailings, 40 parts of fly ash, 15 parts of portland cement, 15 parts of wood fiber, 3 parts of vinyl triethoxysilane and 10 parts of flame retardant.
The method for preparing the high-density fireproof fiber floor slab comprises the following steps:
(1) preparing wood fiber: crushing and grinding waste kraft paper bags and/or waste cartons and/or waste packaging paper, cooling at-15 ℃ for 40 minutes, grinding and defibering to remove crude fibers, introducing ammonia gas into the obtained slurry, adjusting the pH of the slurry to 8.5, and pulping to obtain the wood fibers;
(2) preparation of a silane coupling agent solution: and (2) mixing the following components in percentage by mass: 75: 10, uniformly stirring and mixing the vinyltriethoxysilane, ethanol and water to obtain a silane coupling agent solution;
(3) mixing the components in a mass ratio of 1: 0.1: adding 18 percent of red phosphorus and 400 percent of polyethylene glycol into 50 percent of polytetrafluoroethylene emulsion by weight, stirring and mixing uniformly, and then carrying out spray drying to obtain the polytetrafluoroethylene-coated red phosphorus flame retardant;
(4) preparing a slab slurry: and grinding and sieving the bentonite tailings and the fly ash to obtain a material with the particle size of 120-200 meshes. Mixing 30g of treated bentonite tailings, 40g of fly ash, 15g of portland cement, 15g of wood fiber prepared in the step (1), 20g of silane coupling agent solution obtained in the step (2) and 10g of flame retardant prepared in the step (3) according to a ratio to prepare mixed slurry, adding water, and continuously stirring and uniformly mixing to obtain board blank slurry;
(5) manufacturing a plate blank: filtering the plate blank slurry obtained in the step (2) by using coarse cotton cloth, filtering to remove 70-80% of water, pressing into a plate blank by using a 7000 ton press, and demolding;
(6) steaming the plate blank: pre-curing the plate blank sprayed with the silane coupling agent solution at room temperature for 8 hours, putting the plate blank into a steam curing kettle for steam curing, drying, dehydrating, edging and chamfering to obtain the finished product of the high-density fireproof fiber floor slab. The specific technological parameters of the steam curing are normal pressure, room temperature to 80 ℃, the heating rate of 5 ℃/min and the heat preservation for 3 hours; the temperature is increased at the rate of 8 ℃/min to be 80-130 ℃, and the temperature is kept for 3 hours; and (4) keeping the temperature for 4 hours at 130-180 ℃, wherein the heating rate is 10 ℃/min.
Example 3
The high-density fireproof fiber floor slab comprises the following components: 40 parts of bentonite tailings, 30 parts of fly ash, 25 parts of portland cement, 8 parts of wood fiber, 6 parts of vinyl triethoxysilane and 5 parts of a flame retardant.
The method for preparing the high-density fireproof fiber floor slab comprises the following steps:
(1) preparing wood fiber: crushing and grinding waste kraft paper bags and/or waste cartons and/or waste packaging paper, cooling at-18 ℃ for 30 minutes, grinding and defibering to remove crude fibers, introducing ammonia gas into the obtained slurry, adjusting the pH of the slurry to 9, and pulping to obtain the wood fibers;
(2) preparation of a silane coupling agent solution: and (2) mixing the following components in percentage by mass: 75: 10, stirring and uniformly mixing vinyl trimethoxy silane, ethanol and water to prepare a silane coupling agent solution;
(3) mixing the components in a mass ratio of 1: 0.3: adding 20 percent of red phosphorus and 600 percent of polyethylene glycol into 60 percent of polytetrafluoroethylene emulsion by weight, stirring and mixing uniformly, and then carrying out spray drying to obtain the polytetrafluoroethylene-coated red phosphorus flame retardant;
(4) preparing a slab slurry: and grinding and sieving the bentonite tailings and the fly ash to obtain a material with the particle size of 120-200 meshes. Mixing 40g of treated bentonite tailings, 30g of fly ash, 25g of portland cement, 8g of wood fiber prepared in the step (1), 40g of silane coupling agent solution obtained in the step (2) and 5g of flame retardant prepared in the step (3) according to a ratio to prepare mixed slurry, adding water, and continuously stirring and uniformly mixing to obtain board blank slurry;
(5) manufacturing a plate blank: filtering the plate blank slurry obtained in the step (2) by using coarse cotton cloth, filtering to remove 70-80% of water, pressing into a plate blank by using a 7000 ton press, and demolding;
(6) steaming the plate blank: pre-curing the plate blank sprayed with the silane coupling agent solution at room temperature for 10 hours, putting the plate blank into a steam curing kettle for steam curing, drying, dehydrating, edging and chamfering to obtain the finished product of the high-density fireproof fiber floor slab. The specific technological parameters of the steam curing are normal pressure, room temperature to 80 ℃, the heating rate of 5 ℃/min and the heat preservation for 3 hours; the temperature is increased at the rate of 8 ℃/min to be 80-130 ℃, and the temperature is kept for 3 hours; and (4) keeping the temperature for 4 hours at 130-180 ℃, wherein the heating rate is 10 ℃/min.
Comparative example 1
The composition of the high-density fire-resistant fiber floor slab of this comparative example was the same as in example 1, and the preparation method was the same as in example 1, except that the wood fiber in step (1) was prepared as follows:
(1) preparing wood fiber: and (2) crushing, grinding and defibering the waste kraft paper bags or waste paper boxes to remove crude fibers, adding sodium hydroxide into the obtained slurry, adjusting the pH of the slurry to 9, and pulping to obtain the wood fibers.
Comparative example 2
The components of the high-density fireproof fiber floor slab of the comparative example are the same as those of the example 1, the preparation method is also the same as that of the example 1, and the difference is that the specific steam curing process parameters in the step (6) are normal pressure, room temperature to 180 ℃, the heating rate is 8 ℃/min, and the heat preservation is carried out for 10 hours.
Comparative example 3
Compared with the high-density fireproof fiber floor board in the example 1, the high-density fireproof fiber floor board in the comparative example does not contain a silane coupling agent, and other components are the same. The preparation method is the same as the example.
The high-density fireproof fiber floor slabs manufactured in examples 1 to 3 and comparative examples 1 to 2 were tested by a monitoring and inspection station for the quality of building materials in Jiangxi province, and the test results are shown in Table 1:
table 1:
as can be seen from the detection results in Table 1, the addition of the silane coupling agent can significantly improve the flexural strength of the high-density fireproof fiber floor slab, effectively prevent the high-density fireproof fiber floor slab from cracking and prolong the service life of the product. The steam curing method adopting the temperature programming method is beneficial to fully eliminating the internal stress of the high-density fireproof fiber floor slab, improving the flexural strength of the product and reducing the cracking rate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The utility model provides a high density fire prevention fibre floor which characterized in that, high density fire prevention fibre floor raw materials includes: 30-40 parts of bentonite tailings, 30-40 parts of fly ash, 15-25 parts of Portland cement, 8-15 parts of wood fiber, 3-6 parts of silane coupling agent and 5-10 parts of flame retardant;
the flame retardant is prepared by the following method:
adding red phosphorus and a dispersing agent into 40-60 wt% of polytetrafluoroethylene emulsion, stirring and mixing uniformly, and performing spray drying to obtain a polytetrafluoroethylene-coated red phosphorus flame retardant;
the mass ratio of the red phosphorus to the dispersing agent to the 40-60 wt% of polytetrafluoroethylene emulsion is 1: 0.1-0.3: 15-20;
the preparation method of the wood fiber comprises the following steps:
crushing and grinding waste kraft paper bags and/or waste cartons and/or waste packaging paper, cooling at-15 to-20 ℃ for 20-40 minutes, grinding, defibering to remove crude fibers, introducing ammonia gas into the obtained slurry, adjusting the pH of the slurry to 8-9, and pulping to obtain the wood fibers;
the silane coupling agent is isobutyl triethoxysilane, vinyl triethoxysilane or vinyl trimethoxysilane;
the dispersing agent is polyethylene glycol with the molecular weight of 400-600;
the length of the wood fiber is 8-12 mm.
2. A method of making a high density fire resistant fiber floor slab as claimed in claim 1, wherein the method of making includes the steps of:
(1) preparing wood fiber: crushing and grinding waste kraft paper bags and/or waste cartons and/or waste packaging paper, cooling at-15 to-20 ℃ for 20-40 minutes, grinding, defibering to remove crude fibers, introducing ammonia gas into the obtained slurry, adjusting the pH of the slurry to 8-9, and pulping to obtain the wood fibers;
(2) preparation of a silane coupling agent solution: and (2) mixing the following components in percentage by mass: 75: 10, stirring and uniformly mixing the silane coupling agent, ethanol and water to obtain a silane coupling agent solution;
(3) adding red phosphorus and a dispersing agent into 40-60 wt% of polytetrafluoroethylene emulsion, stirring and mixing uniformly, and performing spray drying to obtain a polytetrafluoroethylene-coated red phosphorus flame retardant;
(4) preparing a slab slurry: grinding and sieving bentonite tailings and fly ash to obtain a material with a particle size of 120-200 meshes; mixing the treated bentonite tailings, fly ash, portland cement, the wood fiber prepared in the step (1), the silane coupling agent solution obtained in the step (2) and the flame retardant prepared in the step (3) according to a ratio to prepare mixed slurry, adding water, and continuously stirring and uniformly mixing to obtain board blank slurry;
(5) manufacturing a plate blank: filtering the plate blank slurry obtained in the step (2) by using coarse cotton cloth, filtering to remove 70-80% of water, pressing into a plate blank by using a 7000 ton press, and demolding;
(6) steaming the plate blank: pre-curing the plate blank sprayed with the silane coupling agent solution at room temperature for 8-10 hours, placing the plate blank into a steam curing kettle for steam curing, drying, dehydrating, edging and chamfering to obtain the finished product of the high-density fireproof fiber floor slab.
3. The method for preparing a high-density fireproof fiber floor slab as claimed in claim 2, wherein the mass ratio of the red phosphorus, the dispersing agent and the 40-60 wt% of polytetrafluoroethylene emulsion in the step (3) is 1: 0.1-0.3: 15-20, wherein the dispersing agent is polyethylene glycol with the molecular weight of 400-600.
4. The method for preparing a high-density fireproof fiber floor slab as claimed in claim 2, wherein the mass ratio of the bentonite tailings, the fly ash, the portland cement, the wood fiber, the silane coupling agent solution and the flame retardant in the step (4) is 30-40: 30-40: 15-25: 8-15: 20-40: 5 to 10.
5. The preparation method of the high-density fireproof fiber floor slab as claimed in claim 2, wherein the specific technological parameters of the steam curing in the step (6) are normal pressure, room temperature to 80 ℃, heating rate of 5 ℃/min, and heat preservation for 3 hours; the temperature is increased at the rate of 8 ℃/min to be 80-130 ℃, and the temperature is kept for 3 hours; and (4) keeping the temperature for 4 hours at 130-180 ℃, wherein the heating rate is 10 ℃/min.
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