CN117303797A

CN117303797A - High-strength multi-temperature-section fireproof core material, composite board thereof, preparation method and application

Info

Publication number: CN117303797A
Application number: CN202311271925.5A
Authority: CN
Inventors: 李再生; 薛烽; 储成林; 陶卫建; 刘欢
Original assignee: Jiangsu Zaisheng New Material Technology Co ltd
Current assignee: Jiangsu Zaisheng New Material Technology Co ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2023-12-29
Anticipated expiration: 2043-09-28
Also published as: CN117303797B

Abstract

The invention discloses a high-strength multi-temperature-section fireproof core material, a composite board thereof, a preparation method and application thereof, and belongs to the technical field of fireproof metal composite board processing. A high strength multi-temperature section fire resistant core material comprising: 100 parts by weight of nested powder consisting of 10-20 parts by weight of magnesium hydroxide, 20-35 parts by weight of aluminum hydroxide, 10-20 parts by weight of magnesium carbonate, 15-25 parts by weight of dolomite powder and 5-15 parts by weight of calcium carbonate, 2-5 parts by weight of silicified powder, 50 parts by weight of polyurethane glue, 50 parts by weight of water and 20 parts by weight of glass fiber, wherein the matrix of the nested powder is calcium carbonate and dolomite powder; magnesium hydroxide, aluminum hydroxide and magnesium carbonate are distributed on the surface or inside of the matrix in an embedded form. The invention can realize good A-level fireproof effect in a higher and wider temperature range, and the fireproof core material and the composite board thereof obtained by the technology have obviously improved mechanical properties.

Description

High-strength multi-temperature-section fireproof core material, composite board thereof, preparation method and application

Technical Field

The invention relates to a high-strength multi-temperature-section fireproof core material, a composite board thereof, a preparation method and application, in particular to a fireproof core material prepared by using nested composite inorganic powder, a metal composite board thereof, a preparation method and application, and belongs to the technical field of fireproof metal composite board processing.

Background

Building fires have been counted as the most frequent, dangerous fire in fire accidents worldwide, and are the most harmful to human lives and properties. Therefore, fire protection of various materials and facilities in a building is particularly important.

The metal composite board is a novel light composite board which is formed by filling heat-insulating materials, fireproof materials and the like as core materials between an inner metal surface layer and an outer metal surface layer (a color spraying steel plate, a galvanized steel plate, a stainless steel plate, an aluminum plate and the like can be adopted), and generally has the advantages of light weight, small volume, high strength, heat insulation, convenience in installation, short construction period, low manufacturing cost, capability of being detached and repeatedly installed for use and the like, and has wide application in the construction of various warehouses, factory workshops, shops, office buildings, gymnasiums and exhibition halls. In order to achieve good fireproof effect, fireproof composite boards are developed in recent years, wherein the core layer of the fireproof composite boards mainly adopts incombustible inorganic matters, the flame retardant effect brought by the incombustible inorganic matters is far better than that of the traditional Polyethylene (PE) interlayer, and the performance of part of products can reach the A2-grade product standard in national standard building materials and product combustion performance classification (GB 8624-2006). The inorganic core materials widely used at present are mainly aluminum hydroxide and magnesium hydroxide, and the flame retardant mechanisms of the two flame retardants are that the temperature of the system is reduced and the gas concentration in a flame area is diluted by absorbing combustion heat through thermal decomposition, and meanwhile, an oxide layer generated by dehydration promotes carbonization and inhibits the formation of smoke. However, aluminum hydroxide and magnesium hydroxide are both relatively low in thermal decomposition temperature, 180-220 ℃ and 325-350 ℃, respectively, so that combustion continues when the flame temperature is too high or the flame temperature cannot be effectively reduced after decomposition. Therefore, there is a need to develop inorganic core materials that can still be effectively flame retardant over a wide temperature range. In addition, when too many different inorganic powders are added into the inorganic core material, only the bonding effect of polyurethane glue and the hot pressing process are utilized, the mechanical properties of the core material cannot be effectively improved, and thus the core material is easy to break, or the mechanical properties (such as bending property) of the metal composite board prepared by the core material are insufficient.

Aiming at the problems, the invention provides a high-strength multi-temperature-section fireproof core material, a composite board, a preparation method and application thereof, wherein the composite inorganic powder with a nested structure is obtained by utilizing inorganic core materials with various dimension distributions under the action of high-speed mechanical ball milling, and further the high-strength multi-temperature-section A-level fireproof core material and a metal composite board thereof are prepared by utilizing the composite inorganic powder, so that the fireproof effect of the fireproof core material (composite board) in a wider temperature range and excellent mechanical performance are realized.

Disclosure of Invention

The invention provides a high-strength multi-temperature-section fireproof core material, which can realize good A-level fireproof effect in a relatively high and relatively wide temperature range, overcomes the defects of relatively low flame-retardant temperature and relatively narrow temperature range of the traditional magnesium hydroxide and aluminum hydroxide core material, and has remarkably improved mechanical properties.

Meanwhile, the invention provides the composite board which realizes good A-level fireproof effect in a higher and wider temperature range and has obviously improved mechanical properties.

Meanwhile, the invention provides a preparation method of the high-strength multi-temperature-section fireproof core material.

Meanwhile, the invention provides a preparation method of the composite board.

Meanwhile, the invention provides application of the high-strength multi-temperature-section fireproof core material in the building industry.

Meanwhile, the invention provides application of the composite board in the building industry.

In order to solve the technical problems, the invention adopts the following technical scheme:

a high strength multi-temperature section fire resistant core material comprising: 100 parts by weight of nested powder consisting of 10-20 parts by weight of magnesium hydroxide, 20-35 parts by weight of aluminum hydroxide, 10-20 parts by weight of magnesium carbonate, 15-25 parts by weight of dolomite powder and 5-15 parts by weight of calcium carbonate, 2-5 parts by weight of silicified powder, 50 parts by weight of polyurethane glue, 50 parts by weight of water and 20 parts by weight of glass fiber, wherein the matrix of the nested powder is calcium carbonate and dolomite powder; magnesium hydroxide, aluminum hydroxide and magnesium carbonate are distributed on the surface or inside of the matrix in an embedded form.

The average particle size of the nested powders is 30-50 microns.

The particle size of magnesium hydroxide and aluminum hydroxide is 5-10 microns, the mesh number of magnesium carbonate is 400-600 meshes, the mesh number of dolomite powder is 80-150 meshes, and the mesh number of calcium carbonate is 30-48 meshes.

The length of the glass fiber is less than 20 mm.

A composite board with a high-strength multi-temperature-section fireproof core material is used, and a metal panel of the composite board comprises an aluminum alloy plate, a copper alloy plate, a stainless steel plate or a galvanized plate.

A preparation method of a high-strength multi-temperature-section fireproof core material comprises the following steps:

s1, high-energy ball milling: mixing magnesium hydroxide, aluminum hydroxide, magnesium carbonate, dolomite powder and calcium carbonate powder to obtain a material, and performing wet grinding in a high-energy mechanical ball mill to obtain balls: and (3) material: the water mass ratio is 4:1:1, adding a composite grinding aid according to the mass percentage of 0.4-0.6%; after the addition is finished, after the high-speed running for 1h at the rotating speed of 200-250r/min, adjusting the rotating speed to the low speed of 30-50r/min for 20min, and alternately performing the steps until the accumulated time of the high-speed running reaches 8-12h;

the composite grinding aid comprises triethanolamine, oleic acid and glycol, wherein the mol ratio of the oleic acid to the triethanolamine is (1.2-1.5): 1, the volume ratio of oleic acid to triethanolamine to ethylene glycol is 1: (0.8-1.2);

s2, high-frequency vibration: vibrating the mixed powder subjected to high-energy ball milling under the high-frequency action for 10-20min at the frequency of 1000-10000Hz;

s3, medium-low temperature annealing: preserving the temperature of the mixed powder subjected to high-frequency vibration at 120-150 ℃ for 0.5-1h, protecting the temperature in an argon atmosphere, and then forcedly and rapidly cooling to room temperature at a cooling speed of 10 ℃/min to obtain nested powder with an average particle size of 30-50 microns;

S4, mixing powder and pulping: 100 parts of mixed powder after medium and low temperature annealing is uniformly mixed with 2-5 parts of silicified stone powder, 50 parts of polyurethane glue, 50 parts of water and 20 parts of glass fiber according to weight to prepare slurry for use;

s5, prefabricating a core material: extruding the slurry and the non-woven fabrics from a roller at the same time to obtain fireproof core materials with the upper and lower surfaces of the slurry coated with the non-woven fabrics;

s6, drying and shaping: insulating the fireproof core material for 10-20 minutes at 150 ℃ under the pressure of 2-5MPa, and removing the surface layer non-woven fabric to obtain the shaped fireproof core material;

s7, continuously pressing: and continuously pressing the shaped fireproof core material at 100-130 ℃ for 8-10 times to obtain the fireproof core material plate with the required thickness.

A method of making a composite panel comprising the steps of:

s7, continuously pressing: continuously pressing the shaped fireproof core material at 100-130 ℃ for 8-10 times to obtain a fireproof core material plate with required thickness;

S8, compounding a metal panel: and (3) pressing and compounding the fireproof core material plate and the metal panel at a certain temperature, and arranging a high polymer adhesive film between the fireproof core material plate and the two metal laminate plates to obtain the composite plate.

In S8, the pressing temperature is 110-130 ℃.

An application of a high-strength multi-temperature-section fireproof core material in the construction industry.

An application of a composite board in the building industry.

The invention has the action principle that:

in the invention, the flame retardant principle of each component is as follows: aluminum hydroxide has a decomposition temperature ranging from about 180 to about 220 ℃ and generates Al after decomposition ₂ O ₃ And H ₂ O (water vapor); magnesium hydroxide has a decomposition temperature ranging from about 300 to about 350 ℃ and generates MgO and H after decomposition ₂ O (water vapor); and the particle size of the magnesium hydroxide and the aluminum hydroxide is less than 10 microns; magnesium carbonate has a decomposition temperature of about 400-550 ℃ and generates MgO and CO after decomposition ₂ 400-600 meshes are selected, and the grain diameter is about 20-40 microns; the decomposition temperature of dolomite powder is about 650-800 ℃, and MgO, caO and CO are produced after decomposition ₂ Selecting 80-150 mesh, and particle diameter of about 100-180 μm; the decomposition temperature of the calcium carbonate is about 890-1000 ℃, and CaO and CO are generated after the decomposition ₂ 30-48 mesh is selected, and the particle size is about 300-550 microns. The main components selected by the invention are all incombustible inorganic matters, and the flame retardant mechanism is thermal decomposition, so that heat is absorbed in the decomposition process, and the environmental temperature is reduced; simultaneously releases nonflammable gas, and reduces the concentration of oxygen or air in the environment; and finally, the decomposed oxide can be effectively carbonized to inhibit the formation of smoke. The invention is that The flame-retardant and fire-proof process is based on the coupling effect brought by the difference of the decomposition temperature of five nonflammable inorganic matters in the formula. Specifically, (1) coupling of flame retardant temperature segments: the decomposition temperature of the five inorganic components in the core material comprises a multi-temperature range from 180 ℃ to 1000 ℃; (2) coupling of decomposition times: based on the step-by-step matching from the low decomposition temperature small particle size to the high decomposition temperature large particle size, the core material is tightly connected with the small particles and has small porosity under the connection and bridging actions of the polyurethane glue and the glass fiber. When combustion propagates to the core material, the decomposition reaction kinetics of the inorganic matters (aluminum hydroxide and magnesium hydroxide) with small particle size is further increased, and the initial flame retardant effect is enhanced; when the small-particle-size inorganic matters are not enough to be flame-retardant, the surrounding magnesium carbonate with high decomposition temperature starts to undergo decomposition reaction, so that the surrounding environment temperature is further reduced, and the flame-retardant effect is achieved; similarly, if the fire cannot be reduced further, the dolomite powder particles and the calcium carbonate particles will decompose successively. Thus, coupling of the decomposition time can extend the flame retardant time. (3) coupling of incombustible gas: decomposition of aluminum hydroxide and magnesium hydroxide to produce H ₂ O (water vapor) and the other three inorganic substances are decomposed to generate CO ₂ Gas, H ₂ O is lighter than oxygen and floats upwards, while CO ₂ Heavier than oxygen and sinking, so that the two gases respectively float upwards and sink to isolate oxygen (air) more effectively; (4) coupling of oxides: each inorganic substance is decomposed to produce three oxides (Al ₂ O ₃ MgO, caO) can isolate heat transfer, increase carbonization and inhibit smoke generation.

The forming process of the nested composite inorganic powder comprises the following steps:

1. mechanical ball milling: the high-energy mechanical ball milling adopted in the invention can play three roles: first, the particle size of each inorganic powder is reduced. Because of the reasonable particle size collocation, magnesium hydroxide, aluminum hydroxide and magnesium carbonate are thinned to a few micrometers or even a small amount of the range of submicron, dolomite powder and calcium carbonate are thinned to below 100 micrometers, and the magnesium hydroxide, the aluminum hydroxide and the magnesium carbonate are mainly concentrated to 30-50 micrometers. Secondly, the amorphization of low-melting magnesium hydroxide, aluminum hydroxide and magnesium carbonate inorganic powder is promoted. Under the intense action of high energy, chemical bonds of the crystals (namely magnesium hydroxide, aluminum hydroxide and magnesium carbonate) are broken, and the crystals gradually change into an amorphous state in a large amount. In the high-energy ball milling process, various inorganic powders are repeatedly impacted and crushed, the fresh surfaces are continuously exposed, a large number of defects (vacancies, dislocation and the like) are generated in the particles and on the surfaces, the diffusion activation energy of elements is obviously reduced, the components can be obviously subjected to atomic or ion diffusion at room temperature to generate a welding effect, in addition, the powder is in gradient distribution, small-particle powder is easily nested on the surface layer or near surface layer of large particles, and in particular, the powder which is in a nested structure can be secondarily welded, so that a small amount of small particles can be even wrapped in the large particles.

The high-energy ball milling adopts pulse operation and wet ball milling to prevent powder from heating up due to high-speed ball milling action, and avoid the degradation of magnesium hydroxide and aluminum hydroxide powder to reduce the subsequent flame retardant effect; in addition, the composite grinding aid also acts on the crushing and cooling of the powder. Oleic acid, triethanolamine and ethylene glycol are grinding aids with good effects, and can be used for coating the surfaces of crushed particles so as to prevent agglomeration among fine particles and play a role in splitting agglomerated particles by being adsorbed in cavities of the particles. In addition, along with the increase of the system temperature during ball milling, oleic acid and triethanolamine can also react to generate oleic acid triethanolamine, and the molar ratio of oleic acid triethanolamine is (1.2-1.5): 1 has the most suitable conversion rate. Triethanolamine oleate is an aqueous lubricant and coolant that can significantly reduce the temperature of the system in water, preventing excessive increases in temperature. When oleic acid and triethanolamine react to reduce the content of the grinding aid, the residual glycol can still effectively play the role of the grinding aid. Therefore, the composite grinding aid mainly plays a role in grinding aid (accelerating the crushing of particles and avoiding agglomeration) when the particles are large, and can play a role in cooling a system besides grinding aid after the particles are thinned. The magnesium hydroxide, aluminum hydroxide and the like with low decomposition temperature in the powder are not decomposed, and the powder is converted into an amorphous state.

2. High frequency vibration: due to the high-energy ball milling, certain agglomeration still occurs among particles. Under the action of high-frequency vibration, the particles which are only physically agglomerated, not welded and nested can be dispersed, and the average particle size of the composite powder is further reduced to 30-50 microns.

3. And (3) medium-low temperature annealing: since the amorphous inorganic powder is difficult to decompose, it needs to be further transformed into a crystalline state to maintain the subsequent flame retardant effect. During the high-energy ball milling process, various powders accumulate a great amount of crystal defects and internal deformation energy, and provide conditions for the reaction kinetics of crystallization. Annealing for 0.5-1h under the selected low temperature condition, and then controlling rapid cooling, not only can avoid the decomposition of inorganic matters with low decomposition temperature, but also can promote the amorphous inorganic matters in the nested powder to be only partially crystallized instead of completely crystallized. After medium-low temperature annealing, not only is the nested composite inorganic powder formed, but also the interface of the nested structure is not physically combined, but is formed into atomic-level chemical combination.

4. In the drying and setting process, the heat is preserved for 10-20 minutes under the action of the selected temperature and pressure, the rest of the uncrystallized powder can be promoted to be totally crystallized, and the crystallization process can occur between powder particles in mutual contact under the action of the temperature and the pressure, so that the particles are not only physically bonded by glue, but also are subjected to atomic bonding between the powder, and the core material is ensured to have good bonding strength and mechanical property.

The invention has the following beneficial effects:

(1) The multi-temperature-section fireproof effect is realized, the fireproof effect relates to a wider temperature range (180-1000 ℃), and the fireproof grade reaches the grade A.

(2) Effectively prolongs the flame-retardant time, inhibits the smoke, provides sufficient time and relatively good conditions for personnel escape and fire extinguishment, and ensures the benefits of people, property and the like.

(3) Compared with various inorganic powders which are physically combined by adopting polyurethane glue and a hot pressing process, the atomic combination in the nested composite inorganic powder obviously improves the combination strength of the powders, reduces the porosity, and ensures that the core material has more excellent tensile strength, lower water absorption and heat value; in addition, the metal composite board prepared by the core material has higher bending resistance.

Drawings

FIG. 1 is a transmission photograph of amorphous aluminum hydroxide of the invention and its diffraction pattern;

FIG. 2 is a transmission photograph of a recrystallized aluminum hydroxide of the present invention;

FIG. 3 is an interfacial bond between aluminum hydroxide and calcium carbonate after crystallization in accordance with the present invention;

FIG. 4 is a microscopic morphology of the nested powder of the present invention;

FIG. 5 is an unbound interface microstructure between non-nested particles of the comparative example.

Detailed Description

The objects, technical solutions and advantages of the present invention will be further clarified by the following description with reference to the accompanying drawings and the embodiments of the present invention. The specific embodiments described are only for the purpose of illustrating the invention and are not to be construed as limiting the invention.

Example 1

The core material of the fireproof composite board is composed of composite inorganic powder with an average particle size of 30-50 microns, wherein the composite inorganic powder is nested powder composed of magnesium hydroxide, aluminum hydroxide, magnesium carbonate, dolomite powder and calcium carbonate, and the matrix of the powder is calcium carbonate and dolomite powder; in addition, magnesium hydroxide, aluminum hydroxide and magnesium carbonate are distributed on the surface or inside of the matrix in an embedded form.

The metal panels at the two sides of the fireproof composite board are aluminum alloy plates.

s1, high-energy ball milling: 10 parts of magnesium hydroxide, 20 parts of aluminum hydroxide, 10 parts of magnesium carbonate, 15 parts of dolomite powder and 5 parts of calcium carbonate powder are mixed, wet-milled in a high-energy mechanical ball mill, and the balls: and (3) material: the water mass ratio is 4:1:1, after the high-speed operation at 220r/min for 1h, adjusting the rotating speed to the low-speed operation at 30r/min for 20min, and alternately performing the operation until the accumulation of the high-speed operation time reaches 10h. And adding a composite grinding aid according to the mass percentage of 0.4 percent of the material; (triethanolamine, oleic acid and glycol are used as mixed grinding aids, wherein the mol ratio of the oleic acid to the triethanolamine is 1.3:1, and the volume ratio of the total volume of the oleic acid and the triethanolamine to the glycol is 1:1;

S2, high-frequency vibration: vibrating the mixed powder subjected to high-energy ball milling for 10min under the high-frequency action, wherein the frequency is 1000Hz;

s3, medium-low temperature annealing: the mixed powder after high-frequency vibration is preserved for 1h at 120 ℃, the preserving process is protected by argon atmosphere, and then the mixed powder is forcedly and rapidly cooled to room temperature, wherein the cooling speed is 10 ℃/min;

s4, mixing powder and pulping: 100 parts of the mixed powder subjected to the low-medium temperature annealing are uniformly mixed with 2 parts of siliconized powder, 50 parts of polyurethane glue, 50 parts of water and 20 parts of glass fiber according to weight to prepare slurry for use;

s5, prefabricating a core material: extruding the slurry and the non-woven fabric from a roller simultaneously to obtain fireproof core materials with the upper and lower surfaces of the slurry coated with the non-woven fabric;

s6, drying and shaping: after the fireproof core material is subjected to heat preservation for 10 minutes at 150 ℃ under the pressure of 2MPa, removing the surface layer non-woven fabric to obtain a shaped fireproof core material;

s7, continuously pressing: and continuously pressing the shaped fireproof core material at 100 ℃ for 9 times to obtain the fireproof core material plate with the required thickness.

A method of making a composite panel comprising the steps of:

s7, continuously pressing: continuously pressing the shaped fireproof core material for 9 times at 100 ℃ to obtain a fireproof core material plate with a required thickness;

s8, compounding a metal laminate: and (3) pressing and compounding the fireproof core material plate and the metal laminate at 110 ℃, and arranging a high polymer adhesive film (commercially available commodity) between the fireproof core material plate and the two metal laminates to obtain the multi-temperature-section A-level fireproof composite plate.

In S1, the particle size of magnesium hydroxide and aluminum hydroxide is 5-10 microns, the mesh number of magnesium carbonate is 400-600 meshes, the mesh number of dolomite powder is 80-150 meshes, and the mesh number of calcium carbonate is 30-48 meshes.

After S2 treatment, the nested composite inorganic powder with the average grain diameter of 30-50 microns is obtained.

After S3 treatment, the inorganic components in the obtained nested composite inorganic powder realize the combination of atomic level.

In S3, the length of the glass fiber is 15 mm.

An application of a high-strength multi-temperature-section A-level fireproof composite board in the building industry.

As shown in fig. 1, since chemical bonds of raw material crystalline magnesium hydroxide, aluminum hydroxide and magnesium carbonate are broken under the intense action of high-energy ball milling, the crystals gradually change into amorphous state in large quantity, and fig. 1 is a transmission photograph of amorphous aluminum hydroxide and diffraction pattern thereof.

Since the high-energy ball milling amorphized inorganic powder is difficult to decompose, it needs to be further transformed into a crystalline state to maintain the subsequent flame retardant effect. The intermediate-low temperature annealing is performed under the condition of the embodiment, and then the rapid cooling is controlled, so that not only the decomposition of the inorganic matters with low decomposition temperature of the crystals can be avoided, but also the amorphous inorganic matters in the nested powder are promoted to be only partially crystallized instead of completely crystallized. After the low-medium temperature annealing, not only is the nested composite inorganic powder formed, as shown in fig. 4, but also a large amount of recrystallized aluminum hydroxide appears, as shown in fig. 2, and the interface of the nested structure is not physically bonded, but is chemically bonded at an atomic level, as shown in fig. 3.

Example 2

The metal panels at two sides of the fireproof composite board are copper alloy boards.

s1, high-energy ball milling: 15 parts of magnesium hydroxide, 25 parts of aluminum hydroxide, 15 parts of magnesium carbonate, 20 parts of dolomite powder and 10 parts of calcium carbonate powder are mixed, wet-milled in a high-energy mechanical ball mill, and the balls: and (3) material: the water mass ratio is 4:1:1, after the high-speed operation at 200r/min for 1h, adjusting the rotating speed to 40r/min at low speed for 20min, and alternately performing the operation until the accumulation of the high-speed operation time reaches 8h. And adding a composite grinding aid according to the mass percentage of 0.5 percent of the material; (triethanolamine, oleic acid and glycol are used as mixed grinding aids, wherein the mol ratio of the oleic acid to the triethanolamine is 1.2:1, and the volume ratio of the total volume of the oleic acid and the triethanolamine to the glycol is 1:0.8;

S2, high-frequency vibration: vibrating the mixed powder subjected to high-energy ball milling for 20min under the high-frequency action, wherein the frequency is 5000Hz;

s3, medium-low temperature annealing: the mixed powder after high-frequency vibration is preserved for 0.5h at 130 ℃, the preserving process is protected by argon atmosphere, and then the mixed powder is forcedly and rapidly cooled to room temperature, wherein the cooling speed is 10 ℃/min;

s4, mixing powder and pulping: 100 parts of the mixed powder subjected to the low-medium temperature annealing are uniformly mixed with 5 parts of silicified stone powder, 50 parts of polyurethane glue, 50 parts of water and 20 parts of glass fiber according to weight to prepare slurry for use;

s6, drying and shaping: after the fireproof core material is subjected to heat preservation for 20 minutes at 150 ℃ under the pressure of 5MPa, removing the surface layer non-woven fabric to obtain a shaped fireproof core material;

s7, continuously pressing: and continuously pressing the shaped fireproof core material at 130 ℃ for 8 times to obtain the fireproof core material plate with the required thickness.

A method of making a composite panel comprising the steps of:

s4, mixing powder and pulping: 100 parts of the mixed powder subjected to the low-medium temperature annealing are uniformly mixed with 5 parts of silicified stone powder, 45 parts of polyurethane glue, 45 parts of water and 18 parts of glass fiber according to weight to prepare slurry for use;

s7, continuously pressing: continuously pressing the shaped fireproof core material for 8 times at 130 ℃ to obtain a fireproof core material plate with a required thickness;

s8, compounding a metal laminate: and (3) pressing and compounding the fireproof core material plate and the metal laminate at 130 ℃, and arranging a high polymer adhesive film (commercially available commodity) between the fireproof core material plate and the two metal laminates to obtain the multi-temperature-section A-level fireproof composite plate.

In S3, the length of the glass fiber is 20 mm.

Example 3

The metal panels at two sides of the fireproof composite board are stainless steel plates.

S1, high-energy ball milling: 20 parts of magnesium hydroxide, 30 parts of aluminum hydroxide, 20 parts of magnesium carbonate, 25 parts of dolomite powder and 15 parts of calcium carbonate powder are mixed, wet-milling is carried out in a high-energy mechanical ball mill, and balls: and (3) material: the water mass ratio is 4:1:1, after the high-speed operation at 250r/min for 1h, adjusting the rotating speed to the low-speed operation at 50r/min for 20min, and alternately performing the operation until the accumulation of the high-speed operation time reaches 12h. And adding a composite grinding aid according to the mass percentage of 0.6 percent of the material; (triethanolamine, oleic acid and glycol are used as mixed grinding aids, wherein the mol ratio of the oleic acid to the triethanolamine is 1.5:1, and the volume ratio of the total volume of the oleic acid and the triethanolamine to the glycol is 1:1.2;

s2, high-frequency vibration: vibrating the mixed powder subjected to high-energy ball milling for 15min under the high-frequency action, wherein the frequency is 10000Hz;

s3, medium-low temperature annealing: preserving the temperature of the mixed powder subjected to high-frequency vibration at 150 ℃ for 0.5h, protecting the temperature in an argon atmosphere in the heat preservation process, and then forcedly and rapidly cooling to room temperature at the cooling speed of 10 ℃/min;

s4, mixing powder and pulping: 100 parts of the mixed powder subjected to the low-medium temperature annealing are uniformly mixed with 3 parts of silicified stone powder, 50 parts of polyurethane glue, 50 parts of water and 20 parts of glass fiber according to weight to prepare slurry for use;

s6, drying and shaping: after the fireproof core material is subjected to heat preservation for 15 minutes at 150 ℃ under the pressure of 3MPa, removing the surface layer non-woven fabric to obtain a shaped fireproof core material;

s7, continuously pressing: and continuously pressing the shaped fireproof core material at 120 ℃ for 10 times to obtain the fireproof core material plate with the required thickness.

A method of making a composite panel comprising the steps of:

s4, mixing powder and pulping: 100 parts of the mixed powder subjected to the low-medium temperature annealing are uniformly mixed with 3 parts of silicified stone powder, 55 parts of polyurethane glue, 55 parts of water and 22 parts of glass fiber according to weight to prepare slurry for use;

s7, continuously pressing: continuously pressing the shaped fireproof core material for 10 times at 120 ℃ to obtain a fireproof core material plate with a required thickness;

s8, compounding a metal laminate: and (3) pressing and compounding the fireproof core material plate and the metal laminate at 120 ℃, and arranging a high polymer adhesive film (commercially available commodity) between the fireproof core material plate and the two metal laminates to obtain the multi-temperature-section A-level fireproof composite plate.

In S3, the length of the glass fiber is 10 mm.

Example 4

The metal panels on the two sides of the fireproof composite board are galvanized plates.

S1, high-energy ball milling: 10 parts of magnesium hydroxide, 35 parts of aluminum hydroxide, 10 parts of magnesium carbonate, 20 parts of dolomite powder and 15 parts of calcium carbonate powder are mixed, wet-milled in a high-energy mechanical ball mill, and the balls: and (3) material: the water mass ratio is 4:1:1, after the high-speed operation at 230r/min for 1h, adjusting the rotating speed to the low-speed operation at 50r/min for 20min, and alternately performing the operation until the accumulation of the high-speed operation time reaches 9h. And adding a composite grinding aid according to the mass percentage of 0.5 percent of the material; (triethanolamine, oleic acid and glycol are used as mixed grinding aids, wherein the mol ratio of the oleic acid to the triethanolamine is 1.4:1, and the volume ratio of the total volume of the oleic acid and the triethanolamine to the glycol is 1:0.9;

s2, high-frequency vibration: vibrating the mixed powder subjected to high-energy ball milling for 18min under the high-frequency action, wherein the frequency is 8000Hz;

s3, medium-low temperature annealing: the mixed powder after high-frequency vibration is preserved for 1h at 140 ℃, the preserving process is protected by argon atmosphere, and then the mixed powder is forcedly and rapidly cooled to room temperature, wherein the cooling speed is 10 ℃/min;

s4, mixing powder and pulping: 100 parts of the mixed powder subjected to the low-medium temperature annealing are uniformly mixed with 4 parts of silicified stone powder, 50 parts of polyurethane glue, 50 parts of water and 20 parts of glass fiber according to weight to prepare slurry for use;

s7, continuously pressing: and continuously pressing the shaped fireproof core material for 10 times at 130 ℃ to obtain the fireproof core material plate with the required thickness.

A method of making a composite panel comprising the steps of:

s7, continuously pressing: continuously pressing the shaped fireproof core material for 10 times at 130 ℃ to obtain a fireproof core material plate with a required thickness;

s8, compounding a metal laminate: and (3) pressing and compounding the fireproof core material plate and the metal laminate at 125 ℃, and arranging a high polymer adhesive film (commercially available commodity) between the fireproof core material plate and the two metal laminates to obtain the multi-temperature-section A-level fireproof composite plate.

In S3, the length of the glass fiber is 15 mm.

Comparative example 1 (ball mill high speed run + composite grinding aid)

This comparative example differs from example 1 only in that: the ball mill is operated at a constant speed for only 10 hours at a high speed.

Comparative example 2 (ball mill run at low speed + composite grinding aid)

This comparative example differs from example 1 only in that: the ball mill is operated at a constant speed for only 10 hours at a low speed.

Comparative example 3 (pulse run of ball mill, low speed run with slightly lower speed rotation speed + composite grinding aid)

This comparative example differs from example 1 only in that: the running mode of the ball mill is pulse, after 220r/min high-speed running for 1h, the rotating speed is adjusted to 20r/min low-speed running for 20min, and the operation is alternately performed until the accumulated time of the high-speed running reaches 10h.

Comparative example 4 (pulse run of ball mill, low speed run with slightly higher speed + composite grinding aid)

This comparative example differs from example 1 only in that: the running mode of the ball mill is pulse, after 220r/min high-speed running for 1h, the rotating speed is adjusted to 60r/min low-speed running for 20min, and the operation is alternately performed until the accumulated time of the high-speed running reaches 10h.

Comparative example 5 (pulse run of ball mill + unary grinding aid)

This comparative example differs from example 1 only in that: the grinding aid is oleic acid.

Comparative example 6 (pulse run of ball mill + unary grinding aid)

This comparative example differs from example 1 only in that: the grinding aid is triethanolamine.

Comparative example 7 (pulse run of ball mill + unary grinding aid)

This comparative example differs from example 1 only in that: the grinding aid is glycol.

Comparative example 8 (pulse run of ball mill + binary grinding aid)

This comparative example differs from example 1 only in that: the grinding aid is oleic acid and triethanolamine, and the molar ratio of the oleic acid to the triethanolamine is 1.3:1.

comparative example 9 (pulse run of ball mill + binary grinding aid)

This comparative example differs from example 1 only in that: the grinding aid is oleic acid and ethylene glycol, and the volume ratio of the oleic acid to the ethylene glycol is 1:1.

Comparative example 10 (pulse run of ball mill + binary grinding aid)

This comparative example differs from example 1 only in that: the grinding aid is triethanolamine and ethylene glycol, and the volume ratio of the triethanolamine to the ethylene glycol is 1:1.

comparative example 11 (pulse run of ball mill + ternary grinding aid not in the inventive formulation)

This comparative example differs from example 1 only in that: the grinding aid is oleic acid, triethanolamine and glycol, and the mol ratio of oleic acid to triethanolamine is 1.1:1.

comparative example 12 (pulse run of ball mill + ternary grinding aid not in the inventive formulation)

This comparative example differs from example 1 only in that: the grinding aid is oleic acid, triethanolamine and glycol, and the mol ratio of oleic acid to triethanolamine is 1.6:1.

comparative example 13 (pulse run of ball mill + ternary grinding aid not in the inventive formulation)

This comparative example differs from example 1 only in that: the grinding aid is oleic acid, triethanolamine and ethylene glycol, and the volume ratio of oleic acid to triethanolamine to ethylene glycol is 1:0.7.

comparative example 14 (pulse run of ball mill + ternary grinding aid not in the inventive formulation)

This comparative example differs from example 1 only in that: the grinding aid is oleic acid, triethanolamine and ethylene glycol, and the volume ratio of oleic acid to triethanolamine to ethylene glycol is 1:1.3.

As shown in fig. 5, which is a graph of the unbound interface between non-nested particles of comparative example 14, it can be seen from fig. 5 that the ball milling process of comparative example 14 cannot form nested powder, and the interface of the nested structure cannot form atomic-level chemical bond. Comparative examples 1 to 13 are also, for example, again, no non-bonded interface patterns between non-nested particles are provided.

The tensile strength of the core material was determined according to GB/T228.1.

The core heat value was determined according to GB/T14402.

The water absorption of the core material was measured according to JCT 2561-2020 appendix a.

The bending strength of the metal composite plate was measured according to 7.8.1 in JCT 2561-2020.

The fire performance rating of the metal composite sheet was determined according to GB 8624-2012.

Table 1 comparison of the properties of the fire-resistant core and the metal composite plate obtained in each example and comparative example

It should be appreciated that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is defined by the appended claims.

The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.

Claims

1. A high strength multi-temperature section fire resistant core material comprising: 100 parts by weight of nested powder consisting of 10-20 parts by weight of magnesium hydroxide, 20-35 parts by weight of aluminum hydroxide, 10-20 parts by weight of magnesium carbonate, 15-25 parts by weight of dolomite powder and 5-15 parts by weight of calcium carbonate, 2-5 parts by weight of silicified powder, 45-55 parts by weight of polyurethane glue, 45-55 parts by weight of water and 18-22 parts by weight of glass fiber, wherein the matrix of the nested powder is calcium carbonate and dolomite powder; magnesium hydroxide, aluminum hydroxide and magnesium carbonate are distributed on the surface or inside of the matrix in an embedded form.

2. A high strength multi-temperature section fire resistant core material according to claim 1 wherein the average particle size of the nested powders is 30-50 microns.

3. The high strength multi-temperature section fire-resistant core material according to claim 1, wherein the particle size of magnesium hydroxide and aluminum hydroxide is 5-10 μm, the mesh size of magnesium carbonate is 400-600 mesh, the mesh size of dolomite powder is 80-150 mesh, and the mesh size of calcium carbonate is 30-48 mesh.

4. A high strength multi-temperature section fire resistant core material according to claim 1 wherein the length of the glass fibers is less than 20 mm.

5. A composite board using the high-strength multi-temperature section fireproof core material as claimed in any one of claims 1 to 4, wherein the metal panel of the composite board comprises an aluminum alloy plate, a copper alloy plate, a stainless steel plate or a galvanized plate.

6. The method for preparing the high-strength multi-temperature-section fireproof core material according to any one of claims 1 to 4, which is characterized by comprising the following steps:

7. A method of making a composite panel according to claim 5, comprising the steps of:

8. The process according to claim 7, wherein in S8, the pressing temperature is 110 to 130 ℃.

9. The use of a high strength multi-temperature section fire resistant core material according to any one of claims 1 to 4 in the construction industry.

10. Use of the composite panel according to claim 5 in the construction industry.