CN109111196B - Fireproof magnesium oxide board - Google Patents
Fireproof magnesium oxide board Download PDFInfo
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- CN109111196B CN109111196B CN201811270666.3A CN201811270666A CN109111196B CN 109111196 B CN109111196 B CN 109111196B CN 201811270666 A CN201811270666 A CN 201811270666A CN 109111196 B CN109111196 B CN 109111196B
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- magnesium oxide
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
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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 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; the modified expanded vermiculite is prepared by the following steps: (1) carrying out incomplete expansion calcination on vermiculite: (2) adding the incomplete expanded vermiculite into a solvent to obtain a vermiculite suspension; (3) adding a fire-proof modifier 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. Vermiculite chemical composition〔(Mg，Fe，Al)3(Si，Al)4O10(OH)2〕·4H2O, but the constant change is indefinite, belongs to monoclinic system, is in a sheet shape, has the hardness of 1-1.5, the density of 2400-2700 kg/m3 and the flexibility of the sheet, and has the most important property that the sheet can expand when heated, and the expansion is maximum at 800-1000 ℃, and the expansion multiple is 8-15 times, and can reach 30 times when the expansion multiple is higher. The density of the expanded vermiculite is generally 80-200 kg/m3, the heat conductivity coefficient is 0.047-0.07W/(m.K), the sound absorption coefficient is 0.50-0.63 (the frequency is 512Hz), and the fire resistance 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.
Disclosure of Invention
The invention provides a fireproof magnesium oxide board which 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.
The modified expanded vermiculite is prepared by the following steps:
(1) carrying out incomplete expansion calcination on vermiculite: removing impurities from vermiculite raw material, putting the vermiculite raw material into a rotary furnace at the temperature of 500-1000 ℃, heating and expanding for 10-20 seconds, discharging to obtain incomplete expanded vermiculite, and ensuring that the stacking density of the incomplete expanded vermiculite is 1200kg/m3；
(2) Adding the incomplete expanded vermiculite into a solvent, fully stirring and ultrasonically dispersing for 20-40 minutes to obtain a vermiculite suspension;
(3) adding a fireproof modifier into the vermiculite suspension, and performing ultrasonic dispersion for 40-60 minutes; wherein the fireproof modifier consists of a low-molecular carbon source, a char forming catalyst and a foaming agent.
(4) And (4) carrying out centrifugal separation on the obtained solution obtained in the step (3), and drying the precipitate to obtain the fireproof expanded vermiculite.
The manufacturing process of the fireproof magnesium oxide board is characterized by comprising the following steps of: 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 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 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 plates after the mold supporting is formed, maintaining for 3 days in a maintenance room, 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 dihydrogen phosphate, ammonium monohydrogen phosphate, ammonium metaphosphate, ammonium hypophosphite, ammonium phosphite, phosphorous acid, metaphosphoric acid and/or orthophosphoric acid, and the foaming agent is dicyandiamide, ammonium oxalate, urea or hexamethylenetetramine.
Wherein the weight ratio of the incompletely expanded vermiculite, the carbon source, the carbon forming catalyst and the foaming agent is about 10 (1-2) to (1-2): (0.5-1.5)
Preferably, the working temperature of the rotary kiln is 500-800 ℃, the heating expansion time is 12-15s, and the optimal time is 13 seconds.
Preferably, the bulk density of the incompletely expanded vermiculite is 900-3Most preferably selected as950-1050kg/m3。
The vermiculite is excessively expanded due to overhigh temperature and overlong heating expansion time, and the loose packing density is too low, so that the further expansion heat absorption fireproof effect cannot be exerted in case of fire; the temperature is too low, the heating expansion time is too short, the vermiculite is not fully expanded, the insertion of the fireproof modifier 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: after vermiculite is subjected to incomplete expansion, an expansion type modifier consisting of a low-molecular carbon source, a char forming catalyst and a foaming agent can enter between layers of the incomplete expansion vermiculite, when the fireproof vermiculite is placed in a high-temperature environment such as a fire disaster, the expansion type modifier consisting of the low-molecular carbon source, the char forming catalyst and the foaming agent and the incomplete expansion vermiculite expand simultaneously, the expansion type modifier and the incomplete expansion vermiculite form thermal expansion foaming 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 being ignited and burnt or the strength is reduced due to temperature rise, meanwhile, the expanded vermiculite and the expanded vermiculite are expanded synchronously to form an organic whole with the carbon foam, the tightness, the heat insulation property and the heat insulation strength of the carbon foam are enhanced, the effects of preventing heat insulation and reducing the strength are further exerted, the two. Experiments prove that the fireproof performance of the intercalation modified incomplete expanded vermiculite is completely superior to the technical scheme of directly and simply blending the incomplete expanded vermiculite with an intumescent fireproof agent consisting of a carbon source, a char forming catalyst and a foaming agent.
And secondly, the intumescent fire-retardant filler is intercalated into the incomplete expanded vermiculite, so that the vermiculite can catalyze the carbon layer to form more carbon residue at high temperature, the generation of combustible escaping substances and the heat transfer are reduced, and meanwhile, the escaped carbon solid particles are further sealed between the vermiculite layers, so that a good smoke suppression effect is achieved.
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 fireproof expanded vermiculite A comprises 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 ℃, heating and expanding for 13 seconds, and discharging to obtain incomplete expanded vermiculite with the density of 1000kg/m 3;
(2) adding the incomplete expanded vermiculite into a solvent, fully stirring and ultrasonically dispersing for 30 minutes to obtain a vermiculite suspension, wherein the solvent is ethanol.
(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, a char forming catalyst and a foaming agent, wherein the carbon source is pentaerythritol, the char forming catalyst is ammonium dihydrogen phosphate, the foaming agent is ammonium oxalate, and the weight ratio of the incompletely expanded vermiculite to the carbon source to the char forming catalyst to the foaming agent is 10: 2: 2: 1.
(4) centrifugally separating the solution obtained in the step (3), and drying the precipitate to obtain the fireproof expanded vermiculite A, wherein
Example 2
On the basis of example 1, the heating expansion time and temperature of vermiculite are changed, so that the bulk density of the expanded vermiculite obtained in step (1) is 200kg/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
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: 2: 2: 1, obtaining the direct blending modified expanded vermiculite D
Example 5
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 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 in the claim 1, 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 plates after the mold supporting is formed, maintaining for 3 days in a maintenance room, 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 was obtained by using the modified expanded vermiculite A, B, C, D prepared in examples 1 to 4.
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
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 (7)
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 parts 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 material, putting the vermiculite raw material into a rotary furnace at the temperature of 500-1000 ℃, heating and expanding for 10-20 seconds, and discharging to obtain incomplete expanded vermiculite with the bulk density of 800-1200 kg/m-3；
(2) Adding the incomplete expanded vermiculite into a solvent, fully stirring and ultrasonically dispersing for 30-40 minutes to obtain a vermiculite suspension;
(3) adding a fireproof modifier into the vermiculite suspension, and performing ultrasonic dispersion for 40-60 minutes; wherein the fireproof modifier consists of a low-molecular carbon source, a char forming catalyst and a foaming agent;
(4) performing centrifugal separation on the solution obtained in the step (3), and primarily drying the precipitate to obtain the fireproof modified expanded vermiculite;
wherein the low molecular carbon source is pentaerythritol, dipentaerythritol or tripentaerythritol, the char-forming catalyst is ammonium dihydrogen phosphate, ammonium monohydrogen phosphate, ammonium metaphosphate, ammonium hypophosphite, ammonium phosphite, phosphorous acid, metaphosphoric acid and/or orthophosphoric acid, and the foaming agent is dicyandiamide, ammonium oxalate, urea or hexamethylenetetramine;
wherein the weight ratio of the incompletely expanded vermiculite, the low molecular carbon source, the char forming catalyst and the foaming agent is 10 (1-2) to (1-2): (0.5-1.5).
2. The fireproof magnesium oxide panel according to claim 1, wherein the working temperature of the rotary furnace is 500-800 ℃, 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 900-3。
5. The fire-resistant magnesium oxide panel as recited in claim 1, wherein the bulk density of the incompletely expanded vermiculite is 950-3。
6. The fire-resistant magnesium oxide panel according to claim 1, wherein the preliminary drying condition is natural air drying.
7. The fireproof magnesium oxide board according to claim 1, wherein the fireproof magnesium oxide board 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 for 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, filling the slurry into template non-woven fabric, pressing to a required size, and demolding 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.
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| CN110499663B (en) * | 2019-08-23 | 2022-03-04 | 山东鲁阳节能材料股份有限公司 | Expansion type fireproof blanket and preparation method thereof |
| CN110407607B (en) * | 2019-09-06 | 2021-10-01 | 石家庄易辰防火保温材料有限公司 | Fireproof magnesium oxide board |
| CN110922156A (en) * | 2019-12-04 | 2020-03-27 | 王晓明 | Preparation method of environment-friendly, economical, high-temperature-resistant and high-strength fireproof door core board |
| 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 |
| CN114853442B (en) * | 2022-05-17 | 2023-06-06 | 石家庄易辰防火保温材料有限公司 | Steel structure fireproof protection board prepared from vermiculite grades with different types and particle sizes |
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| KR20140066086A (en) * | 2012-11-22 | 2014-05-30 | 하워드 종호 신 | Magnesium panel for construction, manufacturing method thereof manufacturing apparatus thereof, and construction installation assembly thereof |
| CN103242056A (en) * | 2013-05-14 | 2013-08-14 | 张家港长盛伟业建材有限公司 | Heat insulation magnesium oxide board and production method of same |
| CN103319198A (en) * | 2013-06-13 | 2013-09-25 | 张家港长盛伟业建材有限公司 | Magnesium oxide plate and manufacturing process thereof |
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