CN111777372A - High-strength fiber reinforced foamed cement insulation board and preparation method thereof - Google Patents

High-strength fiber reinforced foamed cement insulation board and preparation method thereof Download PDF

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CN111777372A
CN111777372A CN202010200879.XA CN202010200879A CN111777372A CN 111777372 A CN111777372 A CN 111777372A CN 202010200879 A CN202010200879 A CN 202010200879A CN 111777372 A CN111777372 A CN 111777372A
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water
insulation board
cement
strength fiber
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吕春粉
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Zhengzhou Zhitao Information Technology Co ltd
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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
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to a high-strength fiber reinforced foamed cement insulation board and a preparation method thereof, wherein the foamed cement insulation board is mainly prepared from water and the following raw materials in parts by weight: 95-96 parts of ordinary portland cement, 4.0-5.0 parts of silica fume, 0.50-0.60 part of water reducing agent, 6.0-7.0 parts of foaming agent hydrogen peroxide, 1.6-2.0 parts of calcium stearate, 0.5-0.6 part of coagulant, 5.5-6.5 parts of microcrystalline foam glass slag, 7.0-8.0 parts of styrene-acrylic emulsion and 0.45-0.60 part of polypropylene fiber; the water-glue ratio is 0.55-0.57. The invention adopts the microcrystalline foam glass slag and the styrene-acrylic emulsion as inorganic-organic reinforcing materials, and the obtained high-strength fiber reinforced foam cement insulation board has good appearance quality, low heat conductivity coefficient, good heat preservation, heat insulation, fire resistance and flame retardance, higher strength, lower volume water absorption, good freeze-thaw resistance cycle performance, good durability and long service life.

Description

High-strength fiber reinforced foamed cement insulation board and preparation method thereof
Technical Field
The invention belongs to the technical field of foamed cement boards, and particularly relates to a high-strength fiber reinforced foamed cement insulation board and a preparation method thereof.
Background
In recent years, civil buildings, particularly commercial housing buildings, are rapidly developed, and high-rise and super high-rise buildings are continuously emerged; in order to reduce weight, insulate heat and preserve heat and save energy, the exterior thermal insulation material of the building exterior wall mostly takes organic materials as main materials, such as polystyrene foam (EPS), extruded polystyrene foam (XPS), polyurethane foam (PU) and the like, although the organic materials have better thermal insulation performance, the heat resistance is poor and the organic materials are easy to burn. With the overall promotion of building energy conservation, the fire-proof problem of the external wall heat-insulating material is more and more severe, and the A-grade fire-proof heat-insulating board is the development trend.
At present, inorganic heat-insulating plates are also put into use, such as gypsum plates, cement plates, steel wire mesh frame cement sandwich plates and the like, but most of the inorganic plates have the problems of large density, heavy mass, poor heat-insulating property and the like, so that the application effect is difficult to meet the building energy-saving requirement. Therefore, the foamed cement heat-insulation board with light weight and good heat-insulation performance is developed.
The foaming cement heat-insulation board is a cement-based light heat-insulation material prepared by mixing and stirring cement serving as a main cementing material, mineral admixture, additive and water, adding foaming agent for foaming and then curing; the novel heat-insulation brick is characterized in that the interior of the novel heat-insulation brick contains rich fine closed air holes, so that the effects of light weight and heat insulation are achieved. Because the raw materials are mostly inorganic mineral materials, the foaming cement heat-insulation board can meet the A1-grade non-combustible fireproof requirement, and does not generate toxic gas under the conditions of high temperature or fire, so the safety is high; the board has light volume weight and low heat conductivity coefficient, and is an ideal heat-insulating material; the material has good compatibility with building materials, high bonding strength with walls, low drying shrinkage value of the plate, strong wind resistance and is very suitable for being used as a building outer wall maintenance material; it belongs to a closed porous material and has good sound insulation effect; the mortar can be used for directly bonding the wall, the operation is easy, the construction is simple and convenient, and the period is short. Based on the advantages, the foamed cement heat-insulation board is gradually applied to areas such as a wall heat-insulation fireproof isolation belt, an outer wall heat-insulation layer and the like.
In order to pursue the light weight and low price of the foamed cement insulation board and reach the use standard of an ultra-light board, the heat conductivity coefficient of the board is reduced by reducing the dry apparent density of the board, the foaming strength is increased, the porosity is increased, the mechanical property and the strength of the board are often rapidly reduced, meanwhile, as the open pores, the communication pores and the microcracks are increased, the water absorption rate of the board is also rapidly increased, the higher water absorption rate can further reduce the strength and the durability of the foamed cement insulation board, the service life of the foamed cement insulation board is shortened, and the popularization and the use of the foamed cement insulation board in winter and in cold areas are also limited.
Disclosure of Invention
The invention aims to provide a high-strength fiber reinforced foamed cement insulation board which has higher strength and durability.
The second purpose of the invention is to provide a preparation method of the high-strength fiber reinforced foamed cement insulation board.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-strength fiber reinforced foamed cement insulation board is mainly prepared from water and the following raw materials in parts by weight: 95-96 parts of ordinary portland cement, 4.0-5.0 parts of silica fume, 0.50-0.60 part of water reducing agent, 6.0-7.0 parts of foaming agent hydrogen peroxide, 1.6-2.0 parts of calcium stearate, 0.5-0.6 part of coagulant, 5.5-6.5 parts of microcrystalline foam glass slag, 7.0-8.0 parts of styrene-acrylic emulsion and 0.45-0.60 part of polypropylene fiber; the water-glue ratio is 0.55-0.57.
The glue in the water-glue ratio refers to a cementing material and is the total mass of cement and silica fume; the water in the water-glue ratio contains additional water and water carried by other components, and the mass sum of the additional water and the water is the sum of the mass of the components. The water-to-glue ratio is 0.55-0.57, the hydration requirement of cement is met, and the cement can be effectively stirred to facilitate later pouring and coagulation hardening.
The water reducing agent is a high-efficiency polycarboxylic acid water reducing agent, and the water reducing rate is more than or equal to 20%.
The mass concentration of the foaming agent hydrogen peroxide is 27-30%.
The coagulant is lithium carbonate.
The grain diameter of the microcrystalline foam glass slag is less than or equal to 4mm, and the volume density is less than or equal to 250kg/m3。
The solid content of the styrene-acrylic emulsion is 40-45%.
The diameter of the polypropylene fiber is 15-25 μm, and the length is 6-10 mm.
The preparation method of the high-strength fiber reinforced foamed cement insulation board comprises the following steps:
1) taking the microcrystalline foam glass slag according to the formula amount, spraying water on the surface of the microcrystalline foam glass slag, stirring to uniformly wet the surface of particles of the microcrystalline foam glass slag, adding cement accounting for 20-25% of the weight of the microcrystalline foam glass slag, and stirring to coat a thin layer of cement on the surface of the particles to obtain a reinforcing material;
2) diluting the styrene-acrylic emulsion with the rest water, adding the water reducing agent, the calcium stearate and the polypropylene fiber in the formula amount, and uniformly stirring and dispersing to obtain a suspension material;
3) adding a cementing material formed by mixing silica fume and the rest cement in the formula amount and the reinforcing material obtained in the step 1) into the suspension obtained in the step 2), stirring at a high speed for 150 seconds, adding a coagulant and a foaming agent hydrogen peroxide in the formula amount, and stirring at a high speed for 20-30 seconds to obtain cement slurry; and injecting the obtained cement slurry into a mold, standing, maintaining and forming, and demolding to obtain the cement slurry.
In the step 1), the water consumption of the water spray is 8-10% of the weight of the microcrystalline foam glass slag.
In the step 3), the rotating speed of the high-speed stirring is 1000-1200 rpm; the rotation speed of the rapid stirring is 400-600 rpm.
In the step 3), the curing time is 16-24 h. Further, standard curing was performed after demolding, and the standard curing time was 28 days.
In the preparation method, the water temperature of the used water is not lower than 35 ℃. Furthermore, the water temperature for summer is 35-40 ℃, the water temperature for winter is 45-50 ℃, and the water temperature for spring and autumn is 40-45 ℃.
The high-strength fiber reinforced foamed cement heat insulation board provided by the invention takes ordinary portland cement and a small amount of silica fume as a cementing material, the particle size ratio of the silica fume is smaller, the silica fume can be effectively filled between cement particle pores and between a base material and fiber pores, after foaming, gel is generated with a hydration product in the pores, the generation of larger pores and cracks is blocked, and the number of large open pores is reduced, so that a matrix is promoted to form a small and dense closed pore structure, the wrapping force of the matrix on the fiber material and the binding force of the matrix on the fiber material are improved, and the mechanical strength and durability of a hardened foamed cement body are improved. The invention adopts hydrogen peroxide as a chemical foaming agent and calcium stearate as a foam stabilizer, so that the foam formed by foaming has good quality and long retention time, a relatively complete and uniform pore structure can be left after the matrix is hardened, and the stability of the foam plate is improved.
The invention adopts microcrystalline foam glass slag and styrene-acrylic emulsion as inorganic-organic reinforcing materials. The microcrystalline foam glass slag is prepared by crushing waste products or rejected quality products generated in a microcrystalline foam glass plate and/or microcrystalline foam glass brick product production line, has the characteristics of high porosity, light weight, high strength, fire resistance, incombustibility, heat preservation and heat insulation, and can be used for remarkably improving the physical and mechanical properties and dimensional stability of a plate by adding the microcrystalline foam glass slag with the volume density similar to the designed density of the plate as aggregate, and saving the cost and mineral resources. The styrene-acrylic emulsion serves as a second adhesive and plays a role in cementing reinforcement in a system, and the microcrystalline foam glass slag, the polypropylene fiber and the matrix are crosslinked together in a three-dimensional network structure in the system by utilizing the film forming effect of polymer macromolecules, so that the cohesive force of the plate is enhanced, and the mechanical strength and the durability of the plate are improved.
According to the invention, the polypropylene fiber is used as a fiber reinforced material, and through reasonable design of fiber diameter and length parameters, in a foaming and forming stage, the effects of steric hindrance and settlement retarding are achieved, foaming air holes are divided by the fiber in the growth process, the formed holes are more uniform and fine, and the stability of a foam system is improved; after hardening, the fiber forms a stable three-dimensional grid structure in the matrix, plays roles of crack resistance strengthening and toughening, and improves the mechanical strength and durability of the plate.
The preparation method of the high-strength fiber reinforced foamed cement insulation board comprises the steps of firstly spraying water on the surface of microcrystalline foam glass slag, stirring to uniformly wet the particle surface, adding a small amount of cement, stirring to coat a thin layer of cement on the particle surface to prepare a reinforcing material; on the one hand, the thin cement layer is used for sealing the open pores on the surface of the microcrystalline foam glass slag, so that the heat preservation and heat insulation performance is improved, and the pores are prevented from absorbing water. Diluting the styrene-acrylic emulsion with the rest water, adding the water reducing agent, the calcium stearate and the polypropylene fibers according to the formula ratio, and uniformly stirring and dispersing to obtain a suspension material, so that polymer macromolecules are firstly entangled with the polypropylene fiber material to form a three-dimensional network structure. Adding a cementing material formed by mixing silica fume and the rest cement in a formula amount and the obtained reinforcing material into the obtained suspension material, stirring at a high speed for 150 seconds to fully disperse the mixture, adding a coagulant in a formula amount and a foaming agent hydrogen peroxide, and stirring at a high speed to prepare cement slurry; and injecting the obtained cement slurry into a mold, standing, curing, forming and demolding to obtain the high-strength fiber reinforced foamed cement insulation board. The preparation method has reasonable process and simple and convenient operation, and is suitable for large-scale industrial production.
Through detection, the high-strength fiber reinforced foamed cement insulation board obtained by the invention has no cracks, unfilled corners, delamination, surface oil stains and the like in appearance; the actual finished product size is within the allowable deviation range, the appearance quality is good, and the use requirement is met. The obtained plate belongs to a II-type heat-insulation plate according to the apparent density; the heat conductivity coefficient (average temperature 25 ℃) is low and is within the range of 0.045-0.048W/(m.K), and the heat insulation performance is good; because the main body is made of inorganic non-combustible materials, the burning performance grades are non-combustible A1 grades, and the fireproof flame-retardant coating has good fireproof and flame-retardant performances; the water absorption of the system is between 7.43 percent and 7.92 percent, and meets the standard requirement; the compressive strength is more than 0.711MPa, the compressive strength is high, and the mechanical property is good. In an anti-freeze-thaw cycle experiment, the heat preservation at-18 ℃ for 3h and the heat preservation at 20 ℃ for 6h are set as one cycle, and after 50 cycles, the compressive strength loss rate of the obtained plate is 14.59-15.04%, the strength loss is small, and the retention rate is high. The experimental result shows that the plate obtained by the invention has higher strength, lower volume water absorption rate, good freeze-thaw cycle resistance, good durability and long service life.
Detailed Description
The present invention will be further described with reference to the following embodiments.
In a specific embodiment, the Portland cement is P.O 42.5.5R-grade Portland cement sold in market, the particle size of the cement particles is 10-30 μm, and the water content is<0.15 percent. The silica fume used is a commercial product, SiO2The content is more than or equal to 90 percent, the particle size is 0.1-0.5 mu m, and the specific surface area is 20-28m2Water content less than or equal to 1.0 percent per gram. The water reducing agent is a high-efficiency polycarboxylic acid water reducing agent sold in the market, and the solid content is30 percent and the water reducing rate is more than or equal to 25 percent. The foaming agent hydrogen peroxide is commercial industrial hydrogen peroxide with the mass concentration of 27.5%. The calcium stearate is a commercial product, white powder and the water content is less than or equal to 2.0 percent. The coagulant is lithium carbonate which is a commercial product and has the water content less than or equal to 1.0 percent. The styrene-acrylic emulsion is a styrene-acrylic emulsion for commercial building waterproof paint, is a milky liquid, has a solid content of 45 percent, a pH value of 8.4 and a monomer residual quantity of 0.4 percent. The polypropylene fiber is a commercial product, the diameter is 15-25 μm, the length is 6-10mm, and the water content is less than or equal to 2.0%.
The microcrystalline foam glass slag is prepared by mechanically crushing microcrystalline foam glass, the microcrystalline foam glass used here comes from waste products produced in a microcrystalline foam glass plate or microcrystalline foam glass brick product production line or rejected products after quality inspection, and the reasons for producing the waste products or the rejected products are mainly edge missing, corner falling, size deviation, cracks, crushing, collision damage and the like; the obtained microcrystalline foam glass slag has a particle size of 1-4mm and a volume density of 201.3kg/m3。
In a specific embodiment, the water-gel ratio refers to the mass ratio of water to the cementing material; the water here comprises the sum of the masses of the added water and the water carried by the other components; the cementing material is the total mass of cement and silica fume. The water temperature of the externally added water used in the examples was 45 ℃ to 50 ℃ (winter standard).
Example 1
The high-strength fiber reinforced foamed cement insulation board is prepared from water and the following raw materials in parts by weight: 95 parts of ordinary portland cement, 5.0 parts of silica fume, 0.50 part of water reducing agent, 6.0 parts of foaming agent hydrogen peroxide, 1.8 parts of calcium stearate, 0.6 part of coagulant lithium carbonate, 6.5 parts of microcrystalline foam glass slag, 8.0 parts of styrene-acrylic emulsion and 0.50 part of polypropylene fiber; the water-to-glue ratio was 0.55.
The preparation method of the high-strength fiber reinforced foamed cement insulation board comprises the following steps:
1) spraying water on the surface of the microcrystalline foam glass slag according to the formula amount, wherein the water consumption is 8% of the weight of the microcrystalline foam glass slag, stirring to uniformly wet the particle surface, adding cement of which the weight is 20% of the weight of the microcrystalline foam glass slag, and stirring to coat a thin layer of cement on the particle surface to obtain a reinforcing material;
2) diluting the styrene-acrylic emulsion with the rest water, adding the water reducing agent, the calcium stearate and the polypropylene fiber in the formula amount, and stirring to uniformly disperse the mixture to obtain a suspension material;
3) adding a cementing material formed by uniformly mixing silica fume and residual cement in a formula amount and the reinforcing material obtained in the step 1) into the suspension obtained in the step 2), stirring at a high speed of 1000rpm for 120-150s, adding a coagulant lithium carbonate and a foaming agent hydrogen peroxide in a formula amount, and stirring at a high speed of 500rpm for 20-30s to obtain cement slurry; and injecting the obtained cement slurry into a mold, standing, maintaining for 16h for molding, demolding, and performing standard maintenance for 28d to obtain the high-strength fiber reinforced foamed cement insulation board.
Example 2
The high-strength fiber reinforced foamed cement insulation board is prepared from water and the following raw materials in parts by weight: 95.5 parts of ordinary portland cement, 4.5 parts of silica fume, 0.55 part of water reducing agent, 6.5 parts of foaming agent hydrogen peroxide, 1.9 parts of calcium stearate, 0.55 part of coagulant lithium carbonate, 6.0 parts of microcrystalline foam glass slag, 7.5 parts of styrene-acrylic emulsion and 0.55 part of polypropylene fiber; the water-to-glue ratio was 0.55.
The preparation method of the high-strength fiber reinforced foamed cement insulation board comprises the following steps:
1) spraying water on the surface of the microcrystalline foam glass slag according to the formula amount, wherein the water consumption is 9% of the weight of the microcrystalline foam glass slag, stirring to uniformly wet the particle surface, adding cement of which the weight is 22% of the weight of the microcrystalline foam glass slag, and stirring to coat a thin layer of cement on the particle surface to obtain a reinforcing material;
2) diluting the styrene-acrylic emulsion with the rest water, adding the water reducing agent, the calcium stearate and the polypropylene fiber in the formula amount, and stirring to uniformly disperse the mixture to obtain a suspension material;
3) adding a cementing material formed by uniformly mixing silica fume and residual cement in a formula amount and the reinforcing material obtained in the step 1) into the suspension obtained in the step 2), stirring at a high speed of 1000rpm for 120-150s, adding a coagulant lithium carbonate and a foaming agent hydrogen peroxide in a formula amount, and stirring at a high speed of 500rpm for 20-30s to obtain cement slurry; and injecting the obtained cement slurry into a mold, standing, maintaining for 16h for molding, demolding, and performing standard maintenance for 28d to obtain the high-strength fiber reinforced foamed cement insulation board.
Example 3
The high-strength fiber reinforced foamed cement insulation board is prepared from water and the following raw materials in parts by weight: 96 parts of ordinary portland cement, 4.0 parts of silica fume, 0.60 part of water reducing agent, 7.0 parts of foaming agent hydrogen peroxide, 2.0 parts of calcium stearate, 0.6 part of coagulant lithium carbonate, 5.5 parts of microcrystalline foam glass slag, 7.0 parts of styrene-acrylic emulsion and 0.60 part of polypropylene fiber; the water-to-glue ratio was 0.55.
The preparation method of the high-strength fiber reinforced foamed cement insulation board comprises the following steps:
1) spraying water on the surface of the microcrystalline foam glass slag according to the formula amount, wherein the water consumption is 10% of the weight of the microcrystalline foam glass slag, stirring to uniformly wet the particle surface, adding 25% of cement according to the weight of the microcrystalline foam glass slag, and stirring to coat a thin layer of cement on the particle surface to obtain a reinforcing material;
2) diluting the styrene-acrylic emulsion with the rest water, adding the water reducing agent, the calcium stearate and the polypropylene fiber in the formula amount, and stirring to uniformly disperse the mixture to obtain a suspension material;
3) adding a cementing material formed by uniformly mixing silica fume and residual cement in a formula amount and the reinforcing material obtained in the step 1) into the suspension obtained in the step 2), stirring at a high speed of 1000rpm for 120-150s, adding a coagulant lithium carbonate and a foaming agent hydrogen peroxide in a formula amount, and stirring at a high speed of 500rpm for 20-30s to obtain cement slurry; and injecting the obtained cement slurry into a mold, standing, maintaining for 16h for molding, demolding, and performing standard maintenance for 28d to obtain the high-strength fiber reinforced foamed cement insulation board.
In order to verify the performance of the high-strength fiber reinforced foamed cement insulation board, performance detection is carried out according to the requirements of JC/T2200-2013 cement-based foamed insulation board, and the results are shown in Table 1.
Performance test results of the high-strength fiber-reinforced foamed cement insulation boards obtained in examples 1 to 3
Figure BDA0002419327020000061
As can be seen from the detection results in Table 1, the high-strength fiber-reinforced foamed cement insulation boards obtained in the embodiments 1 to 3 have no cracks, unfilled corners, cracks, surface oil stains and the like in appearance, the design specification (length ×, width × and thickness) is 300mm × 300mm, × 50mm and 50mm, the actual finished product size is within the allowable deviation range, the appearance quality is good, and the use requirements are met3The heat insulation board belongs to a II-type heat insulation board; the heat conductivity coefficient (average temperature 25 ℃) is low and is 0.045-0.048W/(m.K), and the heat insulation performance is good; because the main body is made of inorganic non-combustible materials, the burning performance grades are non-combustible A1 grades, and the fireproof flame-retardant coating has good fireproof and flame-retardant performances; the water absorption of the system is between 7.43 percent and 7.92 percent, and meets the standard requirement; the compressive strength is 0.711MPa, 0.740MPa and 0.738MPa respectively, the compressive strength is high, and the mechanical property is good. In an anti-freezing-thawing cycle experiment, the heat preservation at-18 ℃ for 3h and the heat preservation at 20 ℃ for 6h are set as a cycle, after 50 cycles, the compressive strengths of the boards obtained in examples 1-3 are respectively 0.606MPa, 0.632MPa and 0.627MPa, the loss rate of the compressive strengths is 14.59-15.04%, the strength loss is small, and the retention rate is high. The experimental result shows that the obtained plate has higher strength, lower volume water absorption rate, good freeze-thaw cycle resistance, good durability and long service life.

Claims (9)

1. The utility model provides a high strength fiber reinforcement foaming cement heated board which characterized in that: the water-based paint is mainly prepared from water and the following raw materials in parts by weight: 95-96 parts of ordinary portland cement, 4.0-5.0 parts of silica fume, 0.50-0.60 part of water reducing agent, 6.0-7.0 parts of foaming agent hydrogen peroxide, 1.6-2.0 parts of calcium stearate, 0.5-0.6 part of coagulant, 5.5-6.5 parts of microcrystalline foam glass slag, 7.0-8.0 parts of styrene-acrylic emulsion and 0.45-0.60 part of polypropylene fiber; the water-glue ratio is 0.55-0.57.
2. The high-strength fiber-reinforced foamed cement insulation board according to claim 1, characterized in that: the mass concentration of the foaming agent hydrogen peroxide is 27-30%.
3. The high-strength fiber-reinforced foamed cement insulation board according to claim 1, characterized in that: the grain diameter of the microcrystalline foam glass slag is less than or equal to 4mm, and the volume density is less than or equal to 250kg/m3。
4. The high-strength fiber-reinforced foamed cement insulation board according to claim 1, characterized in that: the solid content of the styrene-acrylic emulsion is 40-45%.
5. The high-strength fiber-reinforced foamed cement insulation board according to claim 1, characterized in that: the diameter of the polypropylene fiber is 15-25 μm, and the length is 6-10 mm.
6. A preparation method of the high-strength fiber-reinforced foamed cement insulation board as claimed in any one of claims 1 to 5, characterized in that: the method comprises the following steps:
1) taking the microcrystalline foam glass slag according to the formula amount, spraying water on the surface of the microcrystalline foam glass slag, stirring to uniformly wet the surface of particles of the microcrystalline foam glass slag, adding cement accounting for 20-25% of the weight of the microcrystalline foam glass slag, and stirring to coat a thin layer of cement on the surface of the particles to obtain a reinforcing material;
2) diluting the styrene-acrylic emulsion with the rest water, adding the water reducing agent, the calcium stearate and the polypropylene fiber in the formula amount, and uniformly stirring and dispersing to obtain a suspension material;
3) adding a cementing material formed by mixing silica fume and the rest cement in the formula amount and the reinforcing material obtained in the step 1) into the suspension obtained in the step 2), stirring at a high speed for 150 seconds, adding a coagulant and a foaming agent hydrogen peroxide in the formula amount, and stirring at a high speed for 20-30 seconds to obtain cement slurry; and injecting the obtained cement slurry into a mold, standing, maintaining and forming, and demolding to obtain the cement slurry.
7. The preparation method of the high-strength fiber-reinforced foamed cement insulation board according to claim 6, characterized in that: in the step 1), the water consumption of the water spray is 8-10% of the weight of the microcrystalline foam glass slag.
8. The preparation method of the high-strength fiber-reinforced foamed cement insulation board according to claim 6, characterized in that: in the step 3), the rotating speed of the high-speed stirring is 1000-1200 rpm; the rotation speed of the rapid stirring is 400-600 rpm.
9. The preparation method of the high-strength fiber-reinforced foamed cement insulation board according to claim 6, characterized in that: in the step 3), the curing time is 16-24 h.
CN202010200879.XA 2020-03-20 2020-03-20 High-strength fiber reinforced foamed cement insulation board and preparation method thereof Withdrawn CN111777372A (en)

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CN118184218A (en) * 2024-03-26 2024-06-14 佛山市中安亿科新材料有限公司 A thermal insulation wall panel based on bamboo fiber
CN119773030A (en) * 2025-03-07 2025-04-08 东华大学 Polyvinyl alcohol fiber reinforced cement board and manufacturing method thereof

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116283221A (en) * 2023-03-01 2023-06-23 南京声远声学科技有限公司 Micro-perforated sound-absorbing ceramic material based on Taihu sediment and preparation method thereof
CN116283221B (en) * 2023-03-01 2023-11-14 南京声远声学科技有限公司 Micro-perforated sound-absorbing ceramic material based on Taihu sediment and preparation method thereof
CN118184218A (en) * 2024-03-26 2024-06-14 佛山市中安亿科新材料有限公司 A thermal insulation wall panel based on bamboo fiber
CN119773030A (en) * 2025-03-07 2025-04-08 东华大学 Polyvinyl alcohol fiber reinforced cement board and manufacturing method thereof

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