CN113956019A - Wood magnesium board and preparation method thereof - Google Patents
Wood magnesium board and preparation method thereof Download PDFInfo
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- CN113956019A CN113956019A CN202111169175.1A CN202111169175A CN113956019A CN 113956019 A CN113956019 A CN 113956019A CN 202111169175 A CN202111169175 A CN 202111169175A CN 113956019 A CN113956019 A CN 113956019A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
- B28B11/0845—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads for smoothing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/12—Apparatus or processes for treating or working the shaped or preshaped articles for removing parts of the articles by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/025—Hot pressing, e.g. of ceramic materials
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/30—Oxides other than silica
- C04B14/303—Alumina
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to the technical field of materials, and particularly discloses a wood magnesium board and a preparation method thereof. The wood magnesium board is prepared from the following raw materials in percentage by weight: 20-40% of magnesium oxide, 10-20% of magnesium sulfate solution, 20-30% of wood powder, 0.2-0.3% of metal oxide, 3-4% of non-metal oxide, 1-2% of inorganic salt, 0.5-1% of acid, 0.1-0.5% of waterproofing agent and 1-2% of modifying agent. Meanwhile, the preparation method of the wood-magnesium board is disclosed, and the raw materials are accurately metered; mixing, stirring, dispersing and metering paving are carried out under a dry process, prepressing and secondary hot press molding are carried out, demoulding, cutting and sanding treatment can be carried out in a short time, then sheet erecting and drying are carried out, and finally finished products are finely cut and sanded, and then packaging and delivery can be carried out. Effectively reduces the production cost, shortens the production period, and simultaneously has high strength, good toughness, environmental protection and no toxicity.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a wood magnesium board and a preparation method thereof.
Background
In the modern decoration process, the application of the board is very extensive, and various wallboards and floors can be applied to different scenes through combination and assembly. People have higher and higher requirements on boards, the selection of the base material in the existing boards is a larger proportion of the application of the glass magnesium board, but the formula of the glass magnesium board relates to a plurality of organic solvents, such as butylbenzene emulsion, which has nerve toxicity and irritation, the nontoxic organic solvent can also cause harm to the bodies of workers in the actual manufacturing process, and the applied adhesive glue emulsion is one or more of butylbenzene emulsion, carboxylic butylbenzene emulsion and acrylic emulsion, and is also an organic matter which can cause harm to the human body and the environment. Glass fiber is added in the production of some glass magnesium boards, the traditional glass magnesium boards are produced by rolling and leveling lines, the raw material water in the production is in a mixed slurry state, the production field is dirty and messy, the working environment of production workers can not be guaranteed, the final product quality can also be influenced, and the addition of the glass fiber can also lead to the improvement of the overall production cost of the glass magnesium boards. The produced glass magnesium board is not waterproof, and after the test of soaking in water, the water absorption of the glass magnesium board reaches 20% and the thickness of the glass magnesium board expands 4% after 15 days, so that the use of the glass magnesium board is limited.
In the glass-magnesium composite floor CN109503107A in the prior art, although green raw materials are mainly used in the selection of raw materials and the production and manufacturing process, glass fibers are still required to be added to ensure the strength and the hardness of the board, and the production cost is high. Meanwhile, in a glass magnesium board CN101871246A, a novel inorganic decorative base material board CN105130350A and a preparation method thereof, although corresponding formula adjustment is made for improving the environmental protection, the folding resistance, the fire resistance and other properties of the glass magnesium board, a glass fiber net is added as a reinforcing material for ensuring the strength and the toughness of the glass magnesium board. However, the finished plate is always manufactured by adopting the mode of taking the glass fiber as the center and adopting the plate structure as the sandwich structure and coating the glass fiber with the slurry, the integral density and the quality of the plate cannot be guaranteed to be inconsistent, and the integral density of the plate is uneven, so that the influence is caused on the plate in later use. In addition, when the traditional glass magnesium board is combined in the production and preparation process, the problems of overlong production period and high requirements on paving, demolding and maintaining exist, and the production cost is increased finally.
Disclosure of Invention
The invention mainly solves the technical problem of providing the wood-magnesium board which does not need to add glass fiber, effectively reduces the production cost, shortens the production period, and has high board strength, good toughness, environmental protection and no toxicity, and the preparation method thereof.
The invention provides the following technical scheme: the wood magnesium board is prepared from the following raw materials in percentage by weight: 20-40% of magnesium oxide, 10-20% of magnesium sulfate solution, 20-30% of wood powder, 0.2-0.3% of metal oxide, 3-4% of non-metal oxide, 1-2% of inorganic salt, 0.5-1% of acid, 0.1-0.5% of waterproofing agent and 1-2% of modifying agent.
Further, the baume degree of the magnesium sulfate solution was 29.5.
Further, the metal oxide is one or a combination of more of aluminum oxide, calcium oxide and iron oxide.
Further, the non-metal oxide is one or a combination of more of silicon dioxide, boron oxide and quartz powder.
Further, the inorganic salt is one or a combination of more of calcium carbonate, magnesium silicate, calcium sulfate, sodium phosphate, sodium hexametaphosphate and sodium hypoborate.
Further, the acid is one or a combination of more of citric acid monohydrate, oxalic acid, phosphoric acid and hydrochloric acid.
Further, the waterproof agent is one or a combination of more of composite silicon, butylbenzene and ferrous sulfate.
Further, the waterproof agent is an aqueous solution of a combination of butylbenzene emulsion, organic composite silicon and a small amount of ferrous sulfate.
Further, the modifier is a combination of citric acid monohydrate, disodium hydrogen phosphate, water, phosphoric acid, sodium hypoborate and lemon water.
Furthermore, the wood powder effectively reduces the overall weight of the wood-magnesium board and increases the toughness of the wood-magnesium board.
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing raw materials, weighing magnesium oxide, magnesium sulfate solution, wood powder, metal oxide, non-metal oxide, inorganic salts, acids, a waterproof agent and a modifier, wherein the metering precision error is controlled to one thousandth;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1000-;
step 3, dispersing; adopting a column type low-speed stirrer, and dispersing the raw material mixture in the step 2 at a low speed by rotating blades at a speed of 10-20 revolutions per minute;
step 4, dry metering and paving; under a dry process, weighing the raw material composition obtained in the step 3, and then uniformly paving the weighed raw material composition by a paving machine to ensure that the thickness of each sheet material is uniform;
step 5, prepressing; pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; prepressing the pavement to fifty percent of the pavement thickness;
step 6, hot pressing; carrying out hot pressing on the plate obtained in the step 5 in a 3000t hot press, wherein the hot pressing time is 4min, and the cooling time after hot pressing is 10 min;
step 7, demolding and cutting; after the step 6 is finished, the plate can be subjected to demoulding, cutting and sanding treatment within 20 min;
step 8, drying the rack pieces; putting the plates prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets per tray, wherein the temperature of the drying room is 45 ℃, the humidity is 40-50RH, and the drying time is 48 h;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Further, the hot pressing temperature in the step 6 is 80-95 ℃/5 min; the pressure is 15-18 MPa.
Further, the steps 2, 3, 4, 5 and 6 of the preparation method are all finished by stirring, dispersing, paving, pre-pressing and hot pressing under a dry process.
Compared with the prior art, the invention has the beneficial effects that:
1. the wood magnesium board reduces the materials used for increasing the strength of the material in the traditional components such as glass fiber cloth, fiber yarns, glass fiber nets and the like in the proportion of the raw materials; the production cost of each sheet is greatly reduced, and the cost of each sheet can be reduced by about 10-15 yuan; meanwhile, the use of organic solvents can be reduced without using glass fiber materials, in the traditional process, after all components are mixed, the sizing agent is coated on the surface of the glass fiber on a production line of a rolling line, in order to ensure that the sizing agent can be tightly adhered to the surface of the glass fiber, the organic solvents are required to be used for adhesion, the organic solvents easily volatilize harmful gases, the production personnel are injured, and meanwhile, the harmful gases can be continuously volatilized from the cut surfaces of the product within a long period of time.
2. The wood magnesium board is innovatively added with the metal oxide in the formula system, compared with the traditional glass magnesium board, the strength is ensured by coating the glass fiber net with the slurry, the wood magnesium board is an integral body after the base material is formed, the integral density of the wood magnesium board is uniform from inside to outside, the quality and the density are uniform, the situations of large middle strength and weak surface strength cannot occur, a firm internal structure is formed by uniformly dispersing the metal oxide in the whole base material, and the integral strength of the board is effectively improved. Compared with the traditional glass magnesium board, the internal bonding strength is 2-3 higher, the average internal bonding strength is about 4.5, and the internal bonding strength of the traditional glass magnesium board product is only 1-2.5; meanwhile, the bending strength of the wood magnesium board is far higher than that of the traditional glass magnesium board by more than 10-15mpa, and the average bending strength of the wood magnesium board can reach 40 mpa.
3. The wood-magnesium board waterproofing agent is one or a combination of more of composite silicon, butylbenzene and ferrous sulfate, and particularly is an aqueous solution of butylbenzene emulsion, organic composite silicon and a small amount of ferrous sulfate. The water resistance of the board produced by adding the waterproof agent is effectively improved, the wood magnesium board product is soaked in water for 120h after being grooved through testing, the softening coefficient is larger than 0.95, and the softening coefficient of the traditional glass magnesium board product is soaked in water for 120h is 0.2-0.5, so that the water resistance of the wood magnesium board is greatly improved, and the wood magnesium board is beneficial to being applicable to more application scenes.
4. The modifier adopted by the wood-magnesium board can effectively improve the flexural strength of the board, and compared with the common market modifier with the same type, the flexural strength of the board is improved by about 12-17mpa and the compression resistance of the board is improved by about 40 mpa.
5. Compared with a roll-leveling line production mode of slurry coating adopted by the traditional glass magnesium board, the wood magnesium board preparation method disclosed by the invention has the advantages that a dry production process is adopted in the main production steps, the mixture is always kept in a snowflake shape in the mixing and dispersion of raw materials, and the condition that the production site is dirty and poor due to the fact that the mixture is in a slurry state after being mixed in the traditional mode is avoided; the dry process ensures that the production site is dust-free and water-free, optimizes the workshop production environment and reduces pollution.
6. Compared with the traditional production process, the preparation method of the wood magnesium board provided by the invention has the advantages that the sandwich structure of the traditional glass magnesium board is not adopted, the whole raw materials are mixed and hot-pressed together, the product forming and delivery period is effectively shortened, demoulding can be realized after about 16-24 hours after paving in the traditional production process, cutting and sanding can be realized after frame pieces are cured for 4-7 days after demoulding, and packaging and delivery can be realized after the frame pieces are kept still for 2-3 days after sanding. The wood magnesium board adopts a dry process, the internal quality of the board is uniform, the density is uniform, demolding, cutting and sanding can be realized within 20 minutes after paving, the board can be placed in a drying room after sanding, packaging and delivery can be realized after drying for 2-3 days, and the whole delivery process can be completed in 4 days generally. Greatly shortens the delivery cycle of the product in the prior art, improves the turnover rate of the product and supporting equipment, and greatly reduces the production cost. Through preliminary calculation, compared with the traditional process, the curing and drying cost of the preparation method is saved by more than 70 percent; the supporting facilities are saved by more than 60 percent.
7. In the preparation method of the wood-magnesium board, the raw materials are pressed for 2 times in a dry process line to obtain a finished product; firstly, shaping the raw material of the board to 50% of the paving thickness in prepressing, simultaneously ensuring the uniform distribution of slurry, reducing the bubble content and the compressed pores in the slurry, and then carrying out secondary hot pressing to form the board, wherein the final finished product of the wood magnesium board has absolutely no pores in the interior under the scanning of a 500-time electron microscope, while the traditional product can show a large amount of pores in the interior under the scanning of a 50-time electron microscope; therefore, the quality of the plate is greatly improved, and the grooving qualification rate of the plate and the fineness of the product are ensured in the later deep processing process.
8. The flatness of the wood-magnesium board prepared by the wood-magnesium board preparation method is obviously superior to that of the traditional process, the wood-magnesium board can be sanded and then erected after being demoulded in the application, and the accumulated error of the thickness of the board in the process of erecting the board in the traditional process is reduced, so that the flatness of the board is improved, for example, the wood-magnesium board cannot be sanded after being demoulded in the traditional process, the erection of the board is required, the thickness error of the board which is not sanded is 0.5-1mm, the error can reach 10-20cm after 50 boards are accumulated, the thickness error of the wood-magnesium board is controlled within 0.1mm after the sanding, the error is kept within a very small range even after the accumulation and can be almost ignored, and the flatness of the final product is greatly improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The specific embodiment of the invention comprises the following steps:
the wood magnesium board is prepared from the following raw materials in percentage by weight: 20-40% of magnesium oxide, 10-20% of magnesium sulfate solution with the Baume degree of 29.5, 20-30% of wood powder, 0.2-0.3% of metal oxide, 3-4% of non-metal oxide, 1-2% of inorganic salt, 0.5-1% of acid, 0.1-0.5% of waterproof agent and 1-2% of modifier. The metal oxide is one or more of aluminum oxide, calcium oxide and ferric oxide. The non-metal oxide is one or more of silicon dioxide, boron oxide and quartz powder. The inorganic salt is one or more of calcium carbonate, magnesium silicate, calcium sulfate, sodium phosphate, sodium hexametaphosphate and sodium hypoborate. The acid is one or more of citric acid monohydrate, oxalic acid, phosphoric acid and hydrochloric acid. The waterproof agent is one or a combination of more of composite silicon, butylbenzene and ferrous sulfate.
Example 1
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing 40kg of magnesium oxide, 40kg of 29.5-degree magnesium sulfate solution, 30kg of wood powder, 200g of aluminum oxide, 3kg of magnesium silicate, 300g of oxalic acid, 500g of waterproof agent and 2kg of modifier, weighing the raw materials by using a tank bin negative-pressure pneumatic conveying metering system, controlling the metering precision error to be one thousandth, weighing by using the tank bin negative-pressure pneumatic conveying metering system, and controlling the error more accurately;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1000 revolutions per minute, and stirring and mixing the raw materials uniformly at a high speed in a dry process;
step 3, dispersing; adopting a column type low-speed stirrer, and dispersing the raw material mixture in the step 2 at a low speed under a dry process at the blade rotating speed of 10 revolutions per minute;
step 4, dry metering and paving; uniformly paving the raw material composition obtained in the step 3 by a paving machine after weighing through a preset metering system under a dry process, wherein the paving thickness is 3 cm;
step 5, prepressing; under the dry process, pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; the thickness after prepressing is 1.5 cm;
step 6, hot pressing; under the dry process, carrying out hot pressing on the plate obtained in the step 5 in a 3000t hot press, wherein the hot pressing temperature is 80 ℃/5 min; the pressure is 15mpa, the hot-pressing time is 4min, the cooling time after hot pressing is 10min, and the thickness of the plate after hot pressing is 0.8 cm;
step 7, demolding and cutting; after the step 6 is finished, the plate can be subjected to demoulding, cutting and sanding treatment within 20min, and the plate after demoulding has the bending resistance of 21mpa and the compression resistance of 57 mpa;
step 8, drying the rack pieces; putting the plate prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets, wherein the temperature of the drying room is 45 ℃, the humidity is 40RH, and the drying time is 48h, so that the obtained plate is resistant to bending of 37mpa and resistant to compression of 104 mpa;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Example 2
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing 40kg of magnesium oxide, 40kg of 29.5-degree magnesium sulfate solution, 30kg of wood powder, 200g of aluminum oxide, 3kg of magnesium silicate, 300g of oxalic acid, 500g of waterproof agent and 2kg of common market modifier, weighing the raw materials by using a tank bin negative-pressure air conveying metering system, controlling the metering precision error to be one thousandth, weighing by using the tank bin negative-pressure air conveying metering system, and controlling the error more accurately;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1100 r/min, and stirring and mixing the raw materials uniformly at a high speed in a dry process;
step 3, dispersing; adopting a column type low-speed stirrer, rotating the blades at a speed of 15 revolutions per minute, and dispersing the raw material mixture in the step 2 at a low speed in a dry process;
step 4, dry metering and paving; uniformly paving the raw material composition obtained in the step 3 by a paving machine after weighing through a preset metering system under a dry process, wherein the paving thickness is 3 cm;
step 5, prepressing; under the dry process, pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; the thickness after prepressing is 1.5 cm;
step 6, hot pressing; under the dry process, carrying out hot pressing on the plate obtained in the step 5 in a 3000t hot press, wherein the hot pressing temperature is 85 ℃/5 min; the pressure is 16mpa, the hot-pressing time is 4min, the cooling time after hot pressing is 10min, and the thickness of the plate after hot pressing is 0.8 cm;
step 7, demolding and cutting; after the step 6 is finished, 20min, demoulding, cutting and sanding are carried out on the plate, and the plate after demoulding is 9mpa resistant to bending and 19mpa resistant to compression;
step 8, drying the rack pieces; putting the plate prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets, wherein the temperature of the drying room is 45 ℃, the humidity is 40RH, and the drying time is 48h, so that the obtained plate is resistant to bending at 18mpa and resistant to compression at 42 mpa;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Example 3
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing 40kg of magnesium oxide, 40kg of 29.5-degree magnesium sulfate solution, 30kg of wood powder, 200g of aluminum oxide, 3kg of magnesium silicate, 300g of oxalic acid, 500g of waterproof agent and 2kg of common market modifier, weighing the raw materials by using a tank bin negative-pressure air conveying metering system, controlling the metering precision error to be one thousandth, weighing by using the tank bin negative-pressure air conveying metering system, and controlling the error more accurately;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1000 revolutions per minute, and stirring and mixing the raw materials uniformly at a high speed in a dry process;
step 3, dispersing; adopting a column type low-speed stirrer, rotating the blades at a speed of 15 revolutions per minute, and dispersing the raw material mixture in the step 2 at a low speed in a dry process;
step 4, dry metering and paving; uniformly paving the raw material composition obtained in the step 3 by a paving machine after weighing through a preset metering system under a dry process, wherein the paving thickness is 3 cm;
step 5, prepressing; under the dry process, pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; the thickness after prepressing is 1.5 cm;
step 6, hot pressing; under the dry process, the plate obtained in the step 5 is hot-pressed in a 3000t hot press, and the hot-pressing temperature is 90 ℃/5 min; the pressure is 16mpa, the hot-pressing time is 4min, the cooling time after hot pressing is 10min, and the thickness of the plate after hot pressing is 0.8 cm;
step 7, demolding and cutting; after the step 6 is finished, the plate can be subjected to demoulding, cutting and sanding treatment within 20min, and the plate after demoulding has the bending resistance of 11mpa and the compression resistance of 27 mpa;
step 8, drying the rack pieces; putting the plate prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets, wherein the temperature of the drying room is 45 ℃, the humidity is 50RH, and the drying time is 48h, so that the obtained plate is resistant to folding by 19.5mpa and resistant to compression by 43 mpa;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Example 4
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing 40kg of magnesium oxide, 40kg of 29.5-degree magnesium sulfate solution, 30kg of wood powder, 500g of iron oxide, 3kg of magnesium silicate, 300g of oxalic acid, 500g of waterproof agent and 2kg of modifier, weighing the raw materials by using a tank bin negative pressure pneumatic conveying metering system, controlling the error of the metering precision to be one thousandth, weighing by using the tank bin negative pressure pneumatic conveying metering system, and controlling the error to be more accurate;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1400 revolutions per minute, and stirring and mixing the raw materials uniformly at a high speed in a dry process;
step 3, dispersing; performing low-speed dispersion on the raw material mixture in the step 2 by adopting a column type low-speed stirrer and rotating the blades at a speed of 20 revolutions per minute in a dry process;
step 4, dry metering and paving; uniformly paving the raw material composition obtained in the step 3 by a paving machine after weighing through a preset metering system under a dry process, wherein the paving thickness is 3 cm;
step 5, prepressing; under the dry process, pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; the thickness after prepressing is 1.5 cm;
step 6, hot pressing; under the dry process, carrying out hot pressing on the plate obtained in the step 5 in a 3000t hot press at the hot pressing temperature of 95 ℃/5 min; the pressure is 18mpa, the pressing time of hot pressing is 4min, the cooling time after hot pressing is 10min, and the thickness of the plate after hot pressing is 0.8 cm;
step 7, demolding and cutting; after the step 6 is finished, the plate can be subjected to demoulding, cutting and sanding treatment within 20min, and the plate after demoulding has the bending resistance of 18.3mpa and the compression resistance of 42 mpa;
step 8, drying the rack pieces; putting the plate prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets, wherein the temperature of the drying room is 45 ℃, the humidity is 50RH, the drying time is 48h, and the obtained plate is resistant to bending of 31mpa and resistant to compression of 84 mpa;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Example 5
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing 40kg of magnesium oxide, 35kg of 29.5-degree magnesium sulfate solution, 30kg of wood powder, 200g of aluminum oxide, 3kg of magnesium silicate, 300g of oxalic acid, 500g of waterproof agent and 2kg of modifier, weighing the raw materials by using a tank bin negative-pressure pneumatic conveying metering system, controlling the metering precision error to be one thousandth, weighing by using the tank bin negative-pressure pneumatic conveying metering system, and controlling the error more accurately;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1200 revolutions per minute, and stirring and mixing the raw materials uniformly at a high speed in a dry process;
step 3, dispersing; adopting a column type low-speed stirrer, rotating the blades at a speed of 15 revolutions per minute, and dispersing the raw material mixture in the step 2 at a low speed in a dry process;
step 4, dry metering and paving; uniformly paving the raw material composition obtained in the step 3 by a paving machine after weighing through a preset metering system under a dry process, wherein the paving thickness is 3 cm;
step 5, prepressing; under the dry process, pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; the thickness after prepressing is 1.5 cm;
step 6, hot pressing; under the dry process, the plate obtained in the step 5 is hot-pressed in a 3000t hot press, and the hot-pressing temperature is 90 ℃/5 min; the pressure is 17mpa, the hot-pressing time is 4min, the cooling time after hot pressing is 10min, and the thickness of the plate after hot pressing is 0.8 cm;
step 7, demolding and cutting; after the step 6 is finished, the plate can be subjected to demoulding, cutting and sanding treatment within 20min, and the plate after demoulding has the bending resistance of 22.4mpa and the compression resistance of 53.2 mpa;
step 8, drying the rack pieces; putting the plate prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets, wherein the temperature of the drying room is 45 ℃, the humidity is 50RH, and the drying time is 48h, so that the obtained plate is resistant to bending of 39mpa and resistant to compression of 98 mpa;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Example 6
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing 40kg of magnesium oxide, 40kg of 29.5-degree magnesium sulfate solution, 30kg of wood powder, 500g of iron oxide, 3kg of magnesium silicate and 300g of oxalic acid, 1000g of water repellent purchased from the market and 2kg of modifier, weighing the raw materials by using a tank bin negative pressure air conveying metering system, controlling the metering precision error to be one thousandth, weighing by using the tank bin negative pressure air conveying metering system, and controlling the error more accurately;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1400 revolutions per minute, and stirring and mixing the raw materials uniformly at a high speed in a dry process;
step 3, dispersing; performing low-speed dispersion on the raw material mixture in the step 2 by adopting a column type low-speed stirrer and rotating the blades at a speed of 20 revolutions per minute in a dry process;
step 4, dry metering and paving; uniformly paving the raw material composition obtained in the step 3 by a paving machine after weighing through a preset metering system under a dry process, wherein the paving thickness is 3 cm;
step 5, prepressing; under the dry process, pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; the thickness after prepressing is 1.5 cm;
step 6, hot pressing; under the dry process, carrying out hot pressing on the plate obtained in the step 5 in a 3000t hot press at the hot pressing temperature of 95 ℃/5 min; the pressure is 18mpa, the pressing time of hot pressing is 4min, the cooling time after hot pressing is 10min, and the thickness of the plate after hot pressing is 0.8 cm;
step 7, demolding and cutting; after the step 6 is finished, 20min, demoulding, cutting and sanding are carried out on the plate, and the plate after demoulding is 15.6mpa resistant to bending and 41mpa resistant to compression;
step 8, drying the rack pieces; putting the plate prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets, wherein the temperature of the drying room is 45 ℃, the humidity is 50RH, the drying time is 48h, and the obtained plate is 29mpa resistant to bending and 83mpa resistant to compression;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Example 7
A preparation method of a wood magnesium board comprises the following steps:
step 1, accurately metering raw materials; weighing 40kg of magnesium oxide, 35kg of 29.5-degree magnesium sulfate solution, 40kg of wood powder, 200g of aluminum oxide, 3kg of magnesium silicate, 300g of oxalic acid, 500g of waterproof agent and 2kg of modifier, weighing the raw materials by using a tank bin negative-pressure pneumatic conveying metering system, controlling the metering precision error to be one thousandth, weighing by using the tank bin negative-pressure pneumatic conveying metering system, and controlling the error more accurately;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1200 revolutions per minute, and stirring and mixing the raw materials uniformly at a high speed in a dry process;
step 3, dispersing; performing low-speed dispersion on the raw material mixture in the step 2 by adopting a column type low-speed stirrer and rotating the blades at a speed of 20 revolutions per minute in a dry process;
step 4, dry metering and paving; uniformly paving the raw material composition obtained in the step 3 by a paving machine after weighing through a preset metering system under a dry process, wherein the paving thickness is 3 cm;
step 5, prepressing; under the dry process, pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; the thickness after prepressing is 1.5 cm;
step 6, hot pressing; under the dry process, carrying out hot pressing on the plate obtained in the step 5 in a 3000t hot press, wherein the hot pressing temperature is 85 ℃/5 min; the pressure is 17mpa, the hot-pressing time is 4min, the cooling time after hot pressing is 10min, and the thickness of the plate after hot pressing is 0.8 cm;
step 7, demolding and cutting; after the step 6 is finished, the plate can be subjected to demoulding, cutting and sanding treatment within 20min, and the plate after demoulding has the bending resistance of 17.6mpa and the compression resistance of 51 mpa;
step 8, drying the rack pieces; putting the plate prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets, wherein the temperature of the drying room is 45 ℃, the humidity is 45RH, and the drying time is 48h, so that the obtained plate is 33.5mpa in folding resistance and 107mpa in compression resistance;
step 9, fine cutting, sanding, packaging and delivering; and (5) performing fine cutting and sanding on the plate prepared in the step 8 to form finished plates with different specifications, and packaging and delivering the finished plates.
Comparison example (prior art)
Step 1: raw material metering;
step 2: mixing raw materials;
and step 3: roll-pressing pavement, wherein 2-4 layers of glass fiber cloth are required to be embedded;
and 4, step 4: after paving, putting the curing frame on the curing frame, and curing in a first curing room; curing at 30-40 ℃ for 16-24 h;
and 5: demolding and sheet erecting; the breaking strength after demoulding is about 10-13 mpa;
step 6: entering a secondary curing room for secondary curing; maintaining at 35-45 deg.c for 4-7 days;
and 7: taking out of the secondary curing room and standing for 2-3 days; after drying, about 15-17mpa
And 8: cutting, sanding, selecting boards, packing and delivering.
Therefore, in the prior art, the production period of the plate is long and reaches 7-10 days, so that the turnover rate of equipment is low, the cost of the plate is increased due to the adoption of the glass fiber cloth, and the production mode is limited due to the use of the glass fiber cloth, so that the production environment is poor.
The bending resistance and compression resistance parameters, the water content and the softening coefficient of the wood magnesium board prepared in each embodiment are as follows compared with the parameters of the glass magnesium board in the prior art:
the water content in the table is the measured value of the wood magnesium board after being dried for 6 hours at the temperature of 80 ℃, and the softening coefficient is the measured value of the wood magnesium board after being soaked in water for 120 hours. Therefore, the wood magnesium board meeting the market strength requirement can be produced even better by using no traditional reinforcing materials such as glass fiber, glass fiber cloth and glass fiber net; meanwhile, the bending resistance and the compression resistance of the wood-magnesium board are further enhanced by adding the modifier and the waterproof agent.
For example, the modifier in the application is adopted in examples 1, 4, 5, 6 and 7, and the common market modifier is adopted in examples 2 and 3, so that the bending and compression resistance parameters of the wood magnesium board adopting the modifier in the application are greatly improved, and the modifier used in the application has higher influence on the improvement of the bending strength of the board. And the waterproof agent in the application is adopted in the embodiment 4, the common market purchase water repellent is used in the embodiment 6, and the comparison shows that the waterproof property of the wood-magnesium board is effectively improved by using the waterproof agent in the application.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (10)
1. A wood magnesium board is characterized in that: the material is prepared from the following raw materials in percentage by weight: 20-40% of magnesium oxide, 10-20% of magnesium sulfate solution, 20-30% of wood powder, 0.2-0.3% of metal oxide, 3-4% of non-metal oxide, 1-2% of inorganic salt, 0.5-1% of acid, 0.1-0.5% of waterproofing agent and 1-2% of modifying agent.
2. The wood magnesium board according to claim 1, wherein: the baume degree of the magnesium sulfate solution is 29.5.
3. The wood magnesium board according to claim 1, wherein: the metal oxide is one or a combination of more of aluminum oxide, calcium oxide and ferric oxide.
4. The wood magnesium board according to claim 1, wherein: the non-metal oxide is one or a combination of more of silicon dioxide, boron oxide and quartz powder.
5. The wood magnesium board according to claim 1, wherein: the inorganic salt is one or a combination of more of calcium carbonate, magnesium silicate, calcium sulfate, sodium phosphate, sodium hexametaphosphate and sodium hypoborate.
6. The wood magnesium board according to claim 1, wherein: the acid is one or a combination of more of citric acid monohydrate, oxalic acid, phosphoric acid and hydrochloric acid.
7. The wood magnesium board according to claim 1, wherein: the waterproof agent is one or a combination of more of composite silicon, butylbenzene and ferrous sulfate.
8. The wood magnesium board according to claim 7, wherein: the waterproof agent is an aqueous solution of a combination of butylbenzene emulsion, organic composite silicon and a small amount of ferrous sulfate.
9. The wood magnesium board according to claim 1, wherein: the modifier is the combination of citric acid monohydrate, disodium hydrogen phosphate, water, phosphoric acid, sodium hypoborate and lemon water.
10. The preparation method of the wood magnesium board is characterized by comprising the following steps:
step 1, accurately metering raw materials; weighing raw materials, weighing magnesium oxide, magnesium sulfate solution, wood powder, metal oxide, non-metal oxide, inorganic salt, acid, a waterproof agent and a modifier, wherein the error of the metering precision is controlled to one thousandth;
step 2, mixing and stirring by a dry method; adopting a column type high-speed stirrer, wherein the rotating speed of a blade is 1000-;
step 3, dispersing; adopting a column type low-speed stirrer, and dispersing the raw material mixture in the step 2 at a low speed by rotating blades at a speed of 10-20 revolutions per minute;
step 4, dry metering and paving; under a dry process, weighing the raw material composition obtained in the step 3, and then uniformly paving the weighed raw material composition by a paving machine to ensure that the thickness of each sheet material is uniform;
step 5, prepressing; pre-pressing the plate obtained in the step 4 in a 500t single-layer cold press for 10 s; prepressing the pavement to fifty percent of the pavement thickness;
step 6, hot pressing; carrying out hot pressing on the plate obtained in the step 5 in a 3000t hot press, wherein the hot pressing time is 4min, and the cooling time after hot pressing is 10 min; the hot pressing temperature is 80-95 ℃/5 min; the pressure is 15-18 MPa;
step 7, demolding and cutting; after the step 6 is finished, the plate can be subjected to demoulding, cutting and sanding treatment within 20 min;
step 8, drying the rack pieces; putting the plates prepared in the step 7 into a drying room in a sheet-erecting mode of erecting 8 wood strips every 2 trays by 80 sheets per tray, wherein the temperature of the drying room is 45 ℃, the humidity is 40-50RH, and the drying time is 48 h;
step 9, fine cutting, sanding, packaging and delivering; after the plate manufactured in the step 8 is required to be subjected to fine cutting and sanding, finished plates with different specifications are formed, and the finished plates can be packaged and delivered;
the stirring, dispersing, paving, prepressing and hot pressing related to the steps 2, 3, 4, 5 and 6 in the preparation method are all finished under a dry process.
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