CN110407607B - Fireproof magnesium oxide board - Google Patents
Fireproof magnesium oxide board Download PDFInfo
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- CN110407607B CN110407607B CN201910843200.6A CN201910843200A CN110407607B CN 110407607 B CN110407607 B CN 110407607B CN 201910843200 A CN201910843200 A CN 201910843200A CN 110407607 B CN110407607 B CN 110407607B
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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
- C04B28/30—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 magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
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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
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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
- C04B2111/40—Porous or lightweight materials
Abstract
The fireproof magnesium oxide board is prepared by mixing the following raw materials in parts by weight: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of magnesium oxide board crushed powder; 1.5-5 of non-woven fabric; 6-8 parts of water; the modified expanded vermiculite is prepared by the following steps: (1) carrying out incomplete expansion calcination on vermiculite: (2) adding incomplete expanded vermiculite into a solvent to obtain a vermiculite suspension, adding the suspension and a char-forming catalyst into a closed reaction container, heating, stirring at a high speed and preserving heat; (3) adding a low-molecular carbon source and a foaming agent into the vermiculite suspension, and performing ultrasonic dispersion; (4) and carrying out centrifugal separation on the obtained solution, and primarily drying the precipitate to obtain the fireproof expanded vermiculite. The fireproof magnesium oxide board has good fireproof performance and smoke suppression performance.
Description
Technical Field
The invention relates to a plate, in particular to a magnesium oxide plate and a manufacturing process thereof.
Background
The magnesium oxide board is a novel multifunctional building material, has the light weight, flexibility and reprocessing performance of a wood organic board, has the fire resistance and water resistance of an inorganic board, and is applied to wall bodies, suspended ceilings, floor lining boards and other decoration parts with fire protection requirements. The main components of the existing magnesium oxide board are glass fiber mesh cloth (the main source of board strength), magnesium oxide, magnesium chloride, perlite, filling fiber and modified additive. However, the magnesium oxide board used at present has the problems of moisture absorption and halogen return of the board, embrittlement of the board and the like, influences the quality of the product, has poor fireproof and heat-insulating properties and limits the wide application of the product. The Chinese patent application CN201310232377 tries to adopt an expanded foaming material consisting of melamine, pentaerythritol and ammonium polyphosphate to obtain a certain flame retardant effect, but the flame retardant property is difficult to meet the severe requirement of a high-end market on the flame retardant property, such as the fire resistance limit value is more than or equal to 4 hours.
Vermiculite is a complex hydrous iron magnesium silicate mineral, which is a regenerated mineral formed by hydrothermal alteration or weathering of mica minerals. The vermiculite chemical composition is [ (Mg, Fe, Al)３（Ｓｉ，Ａｌ）４Ｏ１０（ＯＨ）２〕・４Ｈ２O, but constant in variation, is monoclinic, is flaky, has a hardness of 1 to 1.5 and a density of 2400 to 2700 kg/m3, the sheet is flexible, and the most important property is that the sheet can expand when heated, wherein the expansion is maximum at 800-1000 ℃, and the expansion ratio is 8-15 times, and can be up to 30 times. The density of the expanded vermiculite is generally 80-200 kg/m3, the thermal conductivity coefficient is 0.047-0.07W/(m seed and seed K), the sound absorption coefficient is 0.50-0.63 (the frequency is 512 Hz), and the refractoriness is 1300-1350 ℃. In addition, the expanded vermiculite has good freezing resistance in a dry state, and the granularity composition of the expanded vermiculite is unchanged after 15 times of freeze thawing at the temperature of-20 ℃. Meanwhile, because the organic fertilizer is inorganic, the organic fertilizer is not corroded by fungi, does not rot or deteriorate, and is not easy to be bitten by insects or rats. Because of such excellent properties, it is widely used. 2 application state of vermiculite is mainly used in building industry, but vermiculite has unique application in other fields. The production process of the expanded vermiculite comprises the following steps: removing impurities from vermiculite, crushing the vermiculite into particles of 1-2 mm, and screening to remove fine powder. After the raw materials are dried (preheated), the raw materials are put back to a rotary kiln or a vertical kiln for carrying out expansion heat treatment, and the thermal regulation of the expansion heat treatment has great influence on the expansion rate of the vermiculite. The vermiculite is slowly heated to 100 ℃, and then is quickly put into a heating furnace preheated to 1000 ℃ for 0.5-1.0 min. And annealing and cooling the vermiculite after the expansion heat treatment to obtain the expanded vermiculite. The expanded vermiculite coming out of the furnace is further subjected to screening to remove unexpanded impurity particles.
In the prior art, a series of attempts are made to modify vermiculite to obtain higher performance, for example, a Chinese patent with publication number 100404612 discloses a preparation method of an expanded vermiculite/potassium polyacrylate-acrylamide high water absorption composite material, which directly uses the expanded vermiculite as a raw material to prepare the high water absorption composite material through graft copolymerization of potassium acrylate and acrylamide monomers; the method adopts expanded vermiculite as a raw material at normal temperature to be compounded with organic matters, and the prepared material has the characteristics of oleophobicity and hydrophilicity and cannot be used in the field of hydrophobic materials. Chinese patent application with publication number CN1800072A discloses a method for rapidly preparing intercalated vermiculite by a dry method, which takes raw vermiculite ore as raw material, is crushed by an air flow mill, takes quaternary ammonium salt as an intercalating agent, and directly synthesizes quaternary ammonium salt intercalated vermiculite by a dry method in a torque rheometer at 100-180 ℃ according to a certain proportion; the method directly modifies the unexpanded vermiculite raw material, has higher product density, and is limited to the application in the fields of light fillers, carriers, organic composite fillers and the like.
However, at present, vermiculite is adopted as a fireproof functional filler to be added into the paint or the fireproof plate, and expanded vermiculite is only directly added or is used together with other fireproof paints such as an expansion flame-retardant system and a halogen-containing flame-retardant system, so that the research on fireproof modification of the expanded vermiculite is lacked. A series of researches and attempts are made by Shijiazhuanyi fire-proof heat-insulating material Co Ltd, wherein CN109321021A adopts a fire-proof modifier consisting of a low-molecular carbon source, a char-forming catalyst and a foaming agent to improve incomplete expanded vermiculite, so that the fire-proof effect of the vermiculite and a conventional fire-proof agent is remarkably improved. However, as is well known, the flame retardant effect of ammonium polyphosphate (APP) is the same as that of other ammonium phosphates, but the ammonium polyphosphate does not have the problems of poor water resistance, easy recrystallization and the like, and because of the advantages of good thermal stability, higher P and N content, low water solubility, no moisture absorption and the like, the ammonium polyphosphate is widely applied to fire-retardant coatings, and particularly has the advantage of low cost, so that the ammonium polyphosphate has strong market competition at present and the control cost becomes the key for enterprise survival, and therefore, the use limitation of the ammonium polyphosphate in the technical scheme makes the production technology urgently need to be improved.
Disclosure of Invention
The invention provides a fireproof magnesium oxide board which is prepared by mixing the following raw materials in parts by weight: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of magnesium oxide board crushed powder; 1.5-5 of non-woven fabric; 6-8 parts of water.
The modified expanded vermiculite is prepared by the following steps:
(1) carrying out incomplete expansion calcination on vermiculite: removing impurities from vermiculite raw materials, putting the vermiculite raw materials into a rotary furnace at the temperature of 700-1000 ℃, heating and expanding for 10-20 seconds, and discharging to obtain incomplete expanded vermiculite with the bulk density of 1000-1200kg/m 3;
(2) adding incomplete expanded vermiculite into a solvent, fully stirring and ultrasonically dispersing for 20-40 minutes to obtain vermiculite suspension, adding the suspension and a char-forming catalyst into a closed reaction container, heating to 120-180 ℃, stirring at a high speed and preserving heat for 2-4 hours to obtain suspension;
(3) adding a fireproof modifier into the suspension obtained in the step (2) at normal temperature, and performing ultrasonic dispersion for 40-60 minutes; wherein the fireproof modifier consists of a low-molecular carbon source and a foaming agent;
(4) and (4) carrying out centrifugal separation on the solution obtained in the step (3), and carrying out primary drying on the precipitate to obtain the modified expanded vermiculite.
The manufacturing process of the fireproof magnesium oxide board comprises the following steps:
(1) putting magnesium oxide, anhydrous magnesium chloride, a foaming agent and the magnesium oxide board crushed powder into a stirrer according to the weight parts of the magnesium oxide board, stirring, filling gas into the stirrer to form bubbles, and stirring for 15 minutes;
(2) adding the aluminum silicate fiber, the fly ash and the sawdust in parts by weight into a stirrer, continuously stirring and mixing, uniformly stirring for 30 minutes to prepare slurry,
(3) then introducing the prepared template into a press, and laying the non-woven fabric;
(4) taking out the slurry obtained in the step (2), adding the slurry into a charging hopper of a press, then filling the slurry into seamless cloth of a template, pressing the seamless cloth to a required size, and demoulding after drying for 8-10 hours;
(5) placing the cured plate and the template in a reverse direction, slightly supporting one corner of the mold by hand, dropping the cured plate by hand, and taking off one side of the mold from the corner to lift the mold;
(6) stacking the formed and demoulded plates together, curing in a curing room for 3 days, and then putting the product into a dry room for 10 days;
(7) and cutting four sides of the dried plate according to the specification requirement.
Wherein the carbon source is pentaerythritol, dipentaerythritol or tripentaerythritol, the char-forming catalyst is ammonium polyphosphate, and the foaming agent is dicyandiamide, ammonium oxalate, urea or hexamethylenetetramine;
wherein the polymerization degree of the ammonium polyphosphate is more than 600 and less than 1000;
wherein the weight ratio of the incompletely expanded vermiculite, the carbon source, the char forming catalyst and the foaming agent is 10 (2-4) to (0.5-1.5): (0.5-1.5).
Preferably, the working temperature of the rotary furnace is 850-950 ℃, and the heating expansion time is 12-15 seconds.
Preferably, the heat expansion time is 13 seconds.
Preferably, the bulk density of the incompletely expanded vermiculite is 1000-1100kg/m3Further 1000-3。
Preferably, the drying condition is natural airing.
Preferably, the closed reaction vessel is a reaction kettle, and the stirring speed is 1200 and 1800 rpm.
According to the invention, through a great amount of research personnel in actual production, the research personnel unexpectedly discover that the calcination temperature of the incomplete expanded vermiculite is adjusted through a system, so that the proper bulk density is adjusted, meanwhile, the adding process of the fireproof modifier is adjusted, the original one-step ultrasonic mixing is changed into two-step hydrothermal stirring mixing and ultrasonic mixing, and through the adjustment of two key process steps and the selection of the proper polymerization degree of the ammonium polyphosphate, the technical scheme of the application breaks through the defect that the prior art is not suitable for the ammonium polyphosphate.
Specifically, for the calcination temperature, the temperature is too high, the heating expansion time is too long, vermiculite is excessively expanded, and loose packing density is too small, so that the further expansion heat absorption fireproof effect cannot be exerted in a fire disaster; the temperature is too low, the heating expansion time is too short, the vermiculite is not fully expanded, the insertion of a fireproof modifier, particularly ammonium polyphosphate is not facilitated, and the insufficient fireproof modifier cannot play a synergistic fireproof and smoke-suppressing role with the expanded vermiculite.
Preferably, the drying condition is natural airing at 25 ℃. The excessive high temperature leads to excessive volatilization of the small molecule fire-proof modifier, the insufficient temperature leads to the problem of uneven dispersion of incomplete expanded vermiculite in the coating due to the fact that a large amount of solvent is attached to the surface of the vermiculite.
After the technical scheme is adopted, the invention at least has the following beneficial effects:
(1) by further optimizing the heating expansion temperature and the stacking density of the expanded vermiculite, the problem that ammonium polyphosphate enters between incomplete expanded vermiculite layers is solved, and the incomplete expanded vermiculite is prevented from being over-expanded.
(2) The ammonium polyphosphate enters the layers of the incompletely expanded vermiculite by stirring and dispersing under a hydrothermal condition, has good dispersibility in a solvent at a proper temperature, rapidly enters the layers of the incompletely expanded vermiculite under a high-speed dispersing and stirring condition, has poor dispersibility in the solvent if the temperature is too low, cannot enter the incompletely expanded vermiculite in a sufficient amount, and can be decomposed to a certain extent if the temperature is too high.
(3) By selecting the polymerization degree of the ammonium polyphosphate, the fireproof coating adopting the modified expanded vermiculite obtains better comprehensive performance in the aspects of water resistance and fire resistance. The polymerization degree is too low, the water resistance is not good, the moisture absorption is easy, the polymerization degree is too high, the amount of ammonium polyphosphate effectively inserted between incomplete expanded vermiculite layers is limited, and the synergistic fireproof effect is difficult to exert.
(4) After the vermiculite is incompletely expanded, an expansion type modifier consisting of a low molecular carbon source, a char forming catalyst ammonium polyphosphate and a foaming agent can enter between the layers of the incompletely expanded vermiculite, when the fireproof vermiculite is placed in high-temperature environments such as fire and the like, the intumescent modifier consisting of the low-molecular carbon source, the char-forming catalyst ammonium polyphosphate and the foaming agent and the incomplete expanded vermiculite expand simultaneously, the former expands and foams under heating to form a carbon foam heat-insulating layer to seal a protected object, the transfer of heat and a base material is delayed, the object is prevented from igniting and burning or the strength is reduced due to the rise of temperature, meanwhile, the expanded vermiculite expands synchronously with the expanded vermiculite to form an organic whole with the carbonaceous foam, so that the tightness, heat insulation and heat insulation strength of the carbonaceous foam are enhanced, further, the effect of preventing heat insulation and strength reduction is exerted, and the two are synergistic, thereby producing unexpected technical effects. Experiments prove that the fireproof performance of the intercalation modified incomplete expanded vermiculite is completely superior to that of an intumescent fireproof agent which is formed by the incomplete expanded vermiculite, a carbon source, a char forming catalyst ammonium polyphosphate and a foaming agent and is directly and simply blended.
(5) The intumescent fire-proof filler is intercalated into the incomplete expanded vermiculite, the vermiculite can not only catalyze the carbon layer to form more carbon residue at high temperature, and reduce the generation of combustible escaping substances and the heat transfer, but also further seal the escaped carbon solid particles between the vermiculite layers, and a good smoke suppression effect is achieved.
(6) The modified expanded vermiculite adopting the ammonium polyphosphate as the char forming catalyst has the advantages of no problems of poor water resistance, easy recrystallization and the like, good thermal stability, higher P and N content, low water solubility, no moisture absorption and the like, and the prepared fireproof coating has the advantages of good water resistance, thermal stability and fireproof performance and low cost.
Detailed Description
The technical solution of the invention will be described in detail with reference to the specific examples.
Example 1
The preparation method of the modified expanded vermiculite A comprises the following steps: (1) carrying out incomplete expansion calcination on vermiculite: removing impurities from vermiculite raw material, putting into a rotary furnace at 850 ℃, heating and expanding for 13 seconds, discharging to obtain incomplete expanded vermiculite with the density of 1050kg/m3；
(2) Adding incomplete expanded vermiculite into a solvent, fully stirring and ultrasonically dispersing for 30 minutes to obtain a vermiculite suspension, wherein the solvent is butanol, adding the suspension and a char-forming catalyst ammonium polyphosphate into a closed reaction container, heating to 150 ℃, stirring at a high speed and preserving heat for 3 hours to obtain a suspension; .
(3) Adding a fireproof modifier into the vermiculite suspension, and performing ultrasonic dispersion for 50 minutes; the fireproof modifier consists of a low-molecular carbon source and a foaming agent, wherein the carbon source is pentaerythritol, the foaming agent is ammonium oxalate, and the weight ratio of the incompletely expanded vermiculite to the carbon source to the carbon forming catalyst to the foaming agent is 10: 3: 1: 1.
(4) and (4) carrying out centrifugal separation on the obtained solution obtained in the step (3), and drying the precipitate to obtain the modified expanded vermiculite A.
Example 2
On the basis of example 1, the vermiculite heating expansion time and temperature are changed so that the expanded vermiculite bulk density obtained in step (1) is 850kg/m3The other preparation steps are the same to obtain the modified expanded vermiculite B
Example 3
On the basis of example 1, the vermiculite heating expansion time and temperature are changed, so that the expanded vermiculite bulk density obtained in step (1) is 2000kg/m3And the other preparation steps are the same, so that the modified expanded vermiculite C is obtained.
Example 4
On the basis of example 1, the step of adding ammonium polyphosphate in advance and heating and stirring at a high speed in the step (2) is omitted, and the ammonium polyphosphate and other fire-retardant modifiers, namely a carbon source and a foaming agent are added in the step (3) in an ultrasonic dispersion manner to obtain modified expanded vermiculite D.
Example 5
The incompletely expanded vermiculite obtained in the step (1) in the embodiment 1 is directly blended with a carbon source, a char forming catalyst and a foaming agent by adopting a high-speed dispersing agent, wherein the weight ratio of the incompletely expanded vermiculite to the carbon source to the char forming catalyst to the foaming agent is 10: 3: 1: 1, obtaining the directly blended modified expanded vermiculite E
Example 6
The fireproof magnesium oxide board is prepared from the following raw materials: 90kg of magnesium oxide; 25kg of anhydrous magnesium chloride; 15kg of modified expanded vermiculite foaming agent; 25kg of aluminum silicate fibers; 8kg of sawdust; 12kg of fly ash; 10 parts of magnesium oxide board pulverized powder; 5kg of non-woven fabric; 8kg of water, and the specific preparation process is as follows:
the method comprises the following steps:
(1) putting magnesium oxide, anhydrous magnesium chloride, a foaming agent and the magnesium oxide board crushed powder into a stirrer according to the weight parts of the magnesium oxide board, stirring, filling gas into the stirrer to form bubbles, and stirring for 15 minutes;
(2) adding the aluminum silicate fiber, the fly ash and the sawdust into a stirrer according to the weight parts of the magnesium oxide board, continuously stirring and mixing, uniformly stirring for 30 minutes to prepare slurry,
(3) then introducing the prepared template into a press, and laying the non-woven fabric;
(4) taking out the slurry obtained in the step (2), adding the slurry into a charging hopper of a press, then filling the slurry into seamless cloth of a template, pressing the seamless cloth to a required size, and demoulding after drying for 8-10 hours;
(5) placing the cured plate and the template in a reverse direction, slightly supporting one corner of the mold by hand, dropping the cured plate by hand, and taking off one side of the mold from the corner to lift the mold;
(6) stacking the formed and demoulded plates together, curing in a curing room for 3 days, and then putting the product into a dry room for 10 days;
(7) and cutting four sides of the dried plate according to the specification requirement. A fireproof magnesium oxide panel A, B, C, D, E was obtained by using the modified expanded vermiculite A, B, C, D, E prepared in examples 1 to 5.
Testing of fire performance
The test for fire endurance (hours) was carried out according to GB50045-95, and the test piece reached the fire endurance when the following occurs. Loss of stability: the column member is axially deformed at a rate greater than h/100(mm) or at an axial deformation rate greater than 3h/1000 (mm/min). h is the initial fire height of the column member after loading and before the fire resistance test, unit: mm.
TABLE 1 fireproof magnesium oxide sheet Properties
| Sample type | Modified expanded vermiculite type | Limit of fire resistance |
| Magnesium oxide sheet material 1 | Modified expanded vermiculite A | 5.0h |
| Magnesium oxide plate 2 | Modified expanded vermiculite B | 3.5h |
| Magnesium oxide sheet 3 | Modified expanded vermiculite C | 3.5h |
| Magnesium oxide sheet 4 | Modified expanded vermiculite D | 3h |
| Magnesium oxide sheet 5 | Modified expanded vermiculite E | 3h |
Therefore, the flame retardant property of the fireproof magnesium oxide board added with the expanded vermiculite modified by a special process is greatly improved with the flame retardant property of the fireproof magnesium oxide board added with the expanded vermiculite modified by direct blending.
Claims (8)
1. The fireproof magnesium oxide board is characterized by being prepared by mixing the following raw materials in parts by weight: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of magnesium oxide board crushed powder; 1.5-5 of non-woven fabric; 6-8 parts of water, wherein the modified expanded vermiculite is prepared by the following steps:
(1) carrying out incomplete expansion calcination on vermiculite: removing impurities from vermiculite raw materials, putting the vermiculite raw materials into a rotary furnace at the temperature of 700-1000 ℃, heating and expanding for 10-20 seconds, and discharging to obtain incomplete expanded vermiculite with the bulk density of 1000-1200kg/m 3;
(2) adding incomplete expanded vermiculite into a solvent, fully stirring and ultrasonically dispersing for 20-40 minutes to obtain vermiculite suspension, adding the suspension and a char-forming catalyst into a closed reaction container, heating to 120-180 ℃, stirring at a high speed and preserving heat for 2-4 hours to obtain suspension;
(3) adding a fireproof modifier into the suspension obtained in the step (2) at normal temperature, and performing ultrasonic dispersion for 40-60 minutes; wherein the fireproof modifier consists of a low-molecular carbon source and a foaming agent;
(4) carrying out centrifugal separation on the solution obtained in the step (3), and primarily drying the precipitate to obtain modified expanded vermiculite;
wherein the carbon source is pentaerythritol, dipentaerythritol or tripentaerythritol, the char-forming catalyst is ammonium polyphosphate, and the foaming agent is dicyandiamide, ammonium oxalate, urea or hexamethylenetetramine;
wherein the polymerization degree of the ammonium polyphosphate is more than 600 and less than 1000;
wherein the weight ratio of the incompletely expanded vermiculite, the carbon source, the char forming catalyst and the foaming agent is 10 (2-4) to (0.5-1.5): (0.5-1.5).
2. The fireproof magnesium oxide panel according to claim 1, wherein the working temperature of the rotary furnace is 850 ℃ and 950 ℃, and the heating expansion time is 12-15 seconds.
3. The fire-resistant magnesium oxide panel according to claim 2, wherein the heat expansion time is 13 seconds.
4. The fire-resistant magnesium oxide panel as recited in claim 1, wherein the bulk density of the incompletely expanded vermiculite is 1000-3。
5. The fire-resistant magnesium oxide panel as recited in claim 1, wherein the bulk density of the incompletely expanded vermiculite is 1000-3。
6. The fire-resistant magnesium oxide panel according to claim 1, wherein the drying condition is natural air drying.
7. The fireproof magnesium oxide board according to claim 1, wherein the closed reaction vessel in step 2 is a reaction kettle, and the stirring speed is 1200 and 1800 rpm.
8. The fireproof magnesium oxide panel of claim 1, wherein the fireproof magnesium oxide panel is manufactured by a process comprising the following steps:
(1) putting magnesium oxide, anhydrous magnesium chloride, a foaming agent and the magnesium oxide board crushed powder into a stirrer according to the weight part of the magnesium oxide board in the claim 1, stirring, filling gas into the stirrer to form bubbles, and stirring for 15 minutes;
(2) adding the aluminum silicate fiber, the fly ash and the sawdust into a stirrer according to the weight parts of the magnesium oxide board, continuously stirring and mixing, uniformly stirring for 30 minutes to prepare slurry,
(3) then introducing the prepared template into a press, and laying the non-woven fabric;
(4) taking out the slurry obtained in the step (2), adding the slurry into a charging hopper of a press, then filling the slurry into seamless cloth of a template, pressing the seamless cloth to a required size, and demoulding after drying for 8-10 hours;
(5) placing the cured plate and the template in a reverse direction, slightly lifting one corner of the mold by hand, dropping the cured plate by hand, and then taking off one side from the corner and lifting the mold;
(6) stacking the formed and demoulded plates together, curing in a curing room for 3 days, and then putting the product into a dry room for 10 days;
(7) and cutting four sides of the dried plate according to the specification requirement.
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| CN112060268A (en) * | 2020-09-12 | 2020-12-11 | 靳冠森 | Fireproof composite shaving board and preparation method thereof |
| CN113402249B (en) * | 2021-07-26 | 2023-01-31 | 石家庄易辰防火保温材料有限公司 | Fireproof magnesium oxide board and manufacturing process thereof |
| CN114804729B (en) * | 2022-05-17 | 2023-03-14 | 石家庄易辰防火保温材料有限公司 | Steel construction fire protection shield that contains silica aerogel |
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| CN105272139A (en) * | 2015-10-29 | 2016-01-27 | 王璐 | Cement foaming heat-insulation board |
| CN105567043A (en) * | 2016-02-19 | 2016-05-11 | 徐冉 | Fireproof paint and preparing method thereof |
| CN107840632A (en) * | 2017-12-01 | 2018-03-27 | 班戈设备系统（苏州）有限公司 | A kind of flame-proof antibiotic type heat-insulating sound-insulating building board and preparation method thereof |
| CN109111196A (en) * | 2018-10-29 | 2019-01-01 | 石家庄易辰防火保温材料有限公司 | A kind of fire prevention Magnesium oxide plate |
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