CN110142844B - Preparation method of glue-free fiber board - Google Patents
Preparation method of glue-free fiber board Download PDFInfo
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- CN110142844B CN110142844B CN201910370826.XA CN201910370826A CN110142844B CN 110142844 B CN110142844 B CN 110142844B CN 201910370826 A CN201910370826 A CN 201910370826A CN 110142844 B CN110142844 B CN 110142844B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/025—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/16—Inorganic impregnating agents
- B27K3/20—Compounds of alkali metals or ammonium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/28—Compounds of silicon
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/10—Treatment with macromolecular organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2240/00—Purpose of the treatment
- B27K2240/15—Decontamination of previously treated wood
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a preparation method of a non-glue fiber board, which comprises the steps of dissolving maleic anhydride in dimethyl formamide, adding hydroquinone, stirring to fully dissolve, adding coupling agent modified bagasse fibers, continuously stirring for reaction, filtering, washing with acetone, and performing Soxhlet extraction in acetone to obtain maleic anhydride modified bagasse fibers; adding a silane coupling agent into ethanol, stirring and hydrolyzing, adding dried silicon carbide powder, stirring in an oil bath, cooling to room temperature, filtering, washing with water, and drying to obtain silicon carbide powder with organically modified surface; uniformly mixing the straw fiber pretreated by alkali, the nano lanthanum oxide grafted on the surface, the bagasse fiber modified by maleic anhydride and the silicon carbide powder organically modified on the surface, dissolving ammonium polyphosphate in water to prepare a solution, applying the solution to the mixture, drying the mixture in a drying box, manually paving the mixture, performing pre-pressing molding, sending the mixture into a hot press for hot pressing, cooling and releasing the pressure to prepare the glue-free fiber board.
Description
Technical Field
The invention belongs to the field of fiber boards, and particularly relates to a preparation method of a glue-free fiber board.
Background
Because the natural fiber has the advantages of low cost, high specific modulus, high specific strength and the like, the preparation of the fiber reinforced composite material by replacing the synthetic fiber with the natural fiber has important practical significance.
With the rapid development of the artificial board industry, the problems of contradiction between supply and demand of wood raw materials and release of free nails are increasingly highlighted. In addition, the artificial board is a flammable material with great fire hazard, and the fire is one of the main disasters threatening public safety and hindering social development. The invention takes the crop residues as the raw materials to develop the high-performance glue-free fiber board for the indoor structure, relieves the problem of shortage of the raw materials of the artificial board, and solves the problem of releasing free nails.
Disclosure of Invention
The invention aims to solve the existing problems and provides a preparation method of a glue-free fiber board, and the glue-free fiber board prepared by the method has excellent mechanical property, friction resistance and flame retardant property.
The invention is realized by the following technical scheme:
the preparation method of the glue-free fiber board is characterized by comprising the following steps of:
(1) the method for modifying the bagasse fiber by maleic anhydride comprises the following steps:
dissolving maleic anhydride in dimethylformamide according to the volume ratio of 5:7, adding hydroquinone accounting for 1% of the total amount of the maleic anhydride, stirring for 5-10min for full dissolution, adding 60-90 parts of coupling agent modified bagasse fibers according to the solid-liquid ratio of 1:20, continuously stirring, reacting at 100-105 ℃ for 4-5h, filtering, washing with acetone, and performing Soxhlet extraction in acetone for 20-24h to obtain maleic anhydride modified bagasse fibers;
the bagasse fiber is modified by adopting a silane coupling agent method, the interface compatibility of the bagasse fiber and the straw fiber can be improved by modifying the silane coupling agent, the thermal stability of the composite fiber board is improved, and the composite fiber board modified by the silane coupling agent has high thermal decomposition activation energy and good mechanical property;
the bagasse fiber modified by the coupling agent is modified by maleic anhydride, the grafting rate of the modified bagasse fiber is high, the maleic anhydride and hydroxyl on the surface of the bagasse fiber are subjected to chemical reaction to form ester bonds, the thermal stability of the modified bagasse fiber is obviously improved, and the performance improvement effect on the composite fiberboard is excellent;
(2) the interface modification treatment method of the silicon carbide powder comprises the following steps:
adding 1-2 parts of silane coupling agent A171 into 40-50 parts of 95% ethanol, stirring for hydrolysis, adding 7-8 parts of silicon carbide powder dried at 105-115 ℃ for 50-70min, stirring in an oil bath at 65-70 ℃ for 1-2h, cooling to room temperature, filtering, washing, and drying at 80-85 ℃ to obtain silicon carbide powder with organically modified surface;
the silane coupling agent A171 is adopted to carry out surface organic modification treatment on the silicon carbide powder, and the introduction of the silicon carbide powder treated by a proper amount of the silane coupling agent can effectively improve the friction resistance of the composite fiberboard;
(3) preparing a glue-free fiber board:
uniformly mixing 20-30 parts of alkali-pretreated straw fiber, 1-2 parts of nano lanthanum oxide grafted on the surface and the materials obtained in the steps (1) and (2), dissolving 3.2-4.8 parts of ammonium polyphosphate 1:15 in water to prepare a solution, applying the solution to the mixture, drying the solution in a drying box at the temperature of 80-85 ℃, manually paving, pre-pressing and molding, sending the mixture into a hot press at the temperature of 180-190 ℃ for hot pressing for 5-15min, cooling and then releasing the pressure to obtain the non-adhesive fiber board;
the straw fibers are modified by using an aqueous solution of sodium hydroxide with the concentration of 8 percent, so that part of hemicellulose in the straw fibers can be removed, the surfaces of the straw fibers are roughened, and the mechanical properties of the composite fiber board are effectively improved;
the silane coupling agent KH590 is adopted to carry out surface organic treatment on the nano lanthanum oxide, so that the impact strength and the bending strength of the composite fiber board can be improved.
Further, the coupling agent modification treatment method of the bagasse in the step (1) comprises the following steps: putting 60-90 parts of bagasse fibers into a drying oven at 80-85 ℃ for drying for 5-6h, adding 6 mass percent acetone solution of silane coupling agent KH550 according to the solid-to-liquid ratio of 1:20, soaking for 45-48h, performing suction filtration, washing for 4-6 times with acetone, air-drying at room temperature for 23-25h, and then putting into an oven at 80-85 ℃ for drying for 20-24h to obtain the bagasse fibers modified by the coupling agent.
Further, the alkaline pretreatment method of the straw fiber in the step (3) comprises the following steps: 20-30 parts of straw fiber is put into a modifier sodium hydroxide aqueous solution with the concentration of 8% according to the mass ratio of 1:20, after soaking treatment for 7-9h, separated and washed with water to be neutral, and dried in a drying oven at the temperature of 80-85 ℃ to constant weight, so that the alkali pretreated straw fiber is obtained.
Further, the surface organization method of the nano lanthanum oxide in the step (3) comprises the following steps: vacuum drying 1-2 parts of nano lanthanum sesquioxide at the temperature of 100-105 ℃ for 20-30min, dropwise adding acetic anhydride into 70 mass percent of acetone aqueous solution to adjust the pH value to 4-5, adding 0.1-0.2 part of silane coupling agent KH590, stirring and hydrolyzing, adding the vacuum dried nano lanthanum sesquioxide, carrying out ultrasonic oscillation for 30-40min after carrying out homogeneous dispersion for 10-20s, filtering, and carrying out vacuum drying to obtain the surface grafted nano lanthanum sesquioxide.
Further, in the step (3), drying is carried out until the water content is 10-12%, and the hot pressing pressure is 6-8 MPa.
Compared with the prior art, the invention has the following advantages:
(1) the bagasse fiber is modified by adopting a silane coupling agent method, the interface compatibility of the bagasse fiber and the straw fiber can be improved by modifying the silane coupling agent, the thermal stability of the composite fiber board is improved, and the composite fiber board modified by the silane coupling agent has high thermal decomposition activation energy and good mechanical property;
the bagasse fiber modified by the coupling agent is modified by maleic anhydride, the grafting rate of the modified bagasse fiber is high, the maleic anhydride and hydroxyl on the surface of the bagasse fiber are subjected to chemical reaction to form ester bonds, the thermal stability of the modified bagasse fiber is obviously improved, and the performance improvement effect on the composite fiberboard is excellent.
(2) The silane coupling agent A171 is adopted to carry out surface organic modification treatment on the silicon carbide powder, and the introduction of the silicon carbide powder treated by a proper amount of the silane coupling agent can effectively improve the friction resistance of the composite fiberboard.
(3) The straw fibers are modified by using an aqueous solution of sodium hydroxide with the concentration of 8 percent, so that part of hemicellulose in the straw fibers can be removed, the surfaces of the straw fibers are roughened, and the mechanical properties of the composite fiber board are effectively improved;
the silane coupling agent KH590 is adopted to carry out surface organic treatment on the nano lanthanum oxide, so that the impact strength and the bending strength of the composite fiberboard can be improved;
the ammonium polyphosphate effectively inhibits the thermal decomposition of the bagasse fibers and promotes the carbonization, and the addition of the ammonium polyphosphate effectively reduces the heat release rate and the total heat release amount of the composite non-glued fiber board and also reduces the smoke release rate and the total smoke release amount of the composite non-glued fiber board.
Detailed Description
Example 1
The preparation method of the glue-free fiber board is characterized by comprising the following steps of:
(1) the method for modifying the bagasse fiber by maleic anhydride comprises the following steps:
dissolving maleic anhydride in dimethylformamide according to the volume ratio of 5:7, adding hydroquinone accounting for 1% of the total amount of the maleic anhydride, stirring for 10min for full dissolution, adding 90 parts of coupling agent modified bagasse fibers according to the solid-liquid ratio of 1:20, continuously stirring, reacting at 105 ℃ for 4h, filtering, washing with acetone, and performing Soxhlet extraction in acetone for 24h to obtain maleic anhydride modified bagasse fibers;
the coupling agent modification treatment method of the bagasse comprises the following steps: putting 90 parts of bagasse fibers into a drying oven at 85 ℃ for drying for 5 hours, adding an acetone solution of a silane coupling agent KH550 with the mass fraction of 6% according to the solid-to-liquid ratio of 1:20, soaking for 48 hours, then carrying out suction filtration, washing for 6 times with acetone, carrying out air drying at room temperature for 25 hours, and then putting into the drying oven at 85 ℃ for drying for 20 hours to obtain bagasse fibers subjected to coupling agent modification treatment;
(2) the interface modification treatment method of the silicon carbide powder comprises the following steps:
adding 2 parts of silane coupling agent A171 into 50 parts of 95% ethanol, stirring and hydrolyzing, adding 8 parts of silicon carbide powder dried at 115 ℃ for 50min, stirring in an oil bath at 70 ℃ for 2h, cooling to room temperature, filtering, washing with water, and drying at 85 ℃ to obtain silicon carbide powder with organically modified surface;
(3) preparing a glue-free fiber board:
uniformly mixing 30 parts of alkali-pretreated straw fibers, 2 parts of nano lanthanum oxide grafted on the surface and the materials obtained in the steps (1) and (2), dissolving 4.8 parts of ammonium polyphosphate 1:15 in water to prepare a solution, applying the solution to the mixture, drying the solution in a drying oven at 85 ℃, manually paving the mixture, performing pre-pressing forming, then sending the mixture into a hot press at 190 ℃ for hot pressing for 5min, cooling and then releasing the pressure to obtain a glue-free fiber board;
the alkali pretreatment method of the straw fiber comprises the following steps: putting 30 parts of straw fiber into a modifier sodium hydroxide aqueous solution with the concentration of 8% according to the mass ratio of 1:20, soaking for 9h, separating and washing to be neutral, and drying in a drying oven at 85 ℃ to constant weight to obtain alkali-pretreated straw fiber;
the surface organic method of nanometer lanthanum oxide comprises the following steps: vacuum drying 2 parts of nano lanthanum sesquioxide at 105 ℃ for 20min, dropwise adding acetic anhydride into 70 mass percent acetone aqueous solution to adjust the pH value to 5, adding 0.2 part of silane coupling agent KH590, stirring and hydrolyzing, adding the vacuum dried nano lanthanum sesquioxide, homogenizing and dispersing for 20s, ultrasonically oscillating for 40min, filtering, and vacuum drying to obtain the surface grafted nano lanthanum sesquioxide;
drying until the water content is 12 percent and the hot pressing pressure is 8 MPa.
Example 2
The preparation method of the glue-free fiber board is characterized by comprising the following steps of:
(1) the method for modifying the bagasse fiber by maleic anhydride comprises the following steps:
dissolving maleic anhydride in dimethylformamide according to the volume ratio of 5:7, adding hydroquinone accounting for 1% of the total amount of the maleic anhydride, stirring for 5min for full dissolution, adding 60 parts of coupling agent modified bagasse fibers according to the solid-liquid ratio of 1:20, continuously stirring, reacting for 5h at 100 ℃, filtering, washing with acetone, and performing Soxhlet extraction in acetone for 20h to obtain maleic anhydride modified bagasse fibers;
the coupling agent modification treatment method of the bagasse comprises the following steps: drying 60 parts of bagasse fibers in a drying oven at 80 ℃ for 6 hours, adding an acetone solution of a silane coupling agent KH550 with the mass fraction of 6% according to the solid-to-liquid ratio of 1:20, soaking for 45 hours, carrying out suction filtration, washing with acetone for 4 times, air-drying at room temperature for 23 hours, and drying in the drying oven at 80 ℃ for 24 hours to obtain bagasse fibers modified by a coupling agent;
(2) the interface modification treatment method of the silicon carbide powder comprises the following steps:
adding 1 part of silane coupling agent A171 into 40 parts of 95% ethanol, stirring and hydrolyzing, adding 7 parts of silicon carbide powder dried at 105 ℃ for 70min, stirring in an oil bath at 65 ℃ for 2h, cooling to room temperature, filtering, washing with water, and drying at 80 ℃ to obtain silicon carbide powder with organically modified surface;
(3) preparing a glue-free fiber board:
uniformly mixing 20 parts of alkali-pretreated straw fiber, 1 part of nano lanthanum oxide grafted on the surface and the materials obtained in the steps (1) and (2), dissolving 3.2 parts of ammonium polyphosphate 1:15 in water to prepare a solution, applying the solution to the mixture, drying the solution in a drying oven at the temperature of 80 ℃, manually paving, performing pre-pressing forming, then sending the mixture into a hot press at the temperature of 180 ℃ for hot pressing for 15min, cooling, and then releasing pressure to obtain a glue-free fiber board;
the alkali pretreatment method of the straw fiber comprises the following steps: 20 parts of straw fiber is put into a modifier sodium hydroxide aqueous solution with the concentration of 8 percent according to the mass ratio of 1:20, after soaking treatment for 7 hours, separated and washed to be neutral, and dried to constant weight in a drying oven at the temperature of 80 ℃ to obtain the straw fiber pretreated by alkali;
the surface organic method of nanometer lanthanum oxide comprises the following steps: vacuum drying 2 parts of nano lanthanum sesquioxide at 100 ℃ for 30min, dropwise adding acetic anhydride into 70 mass percent acetone aqueous solution to adjust the pH value to 4, adding 0.1 part of silane coupling agent KH590, stirring and hydrolyzing, adding the vacuum dried nano lanthanum sesquioxide, homogenizing and dispersing for 10s, ultrasonically oscillating for 30min, filtering, and vacuum drying to obtain the surface grafted nano lanthanum sesquioxide;
drying until the water content is 10 percent and the hot pressing pressure is 6 MPa.
The strength of the hot-pressed glue-free fiber board meets the requirements of the national standard GB/T4897.6-2003, and the hot-pressed glue-free fiber board has excellent mechanical property, friction resistance and flame retardance; the tensile strength of the non-rubber fiber board is 62MPa, and the impact strength is 19KJ/m2The material has excellent mechanical properties; the limiting oxygen index of the non-glue fiber board is 28%, and the non-glue fiber board has excellent flame retardant property; the friction coefficient of the non-glued fiber board is 0.21, and the wear rate is 1.17 multiplied by 10-6mm3/(N·m)And has excellent friction resistance.
Claims (5)
1. The preparation method of the glue-free fiber board is characterized by comprising the following steps of:
(1) the method for modifying the bagasse fiber by maleic anhydride comprises the following steps:
dissolving maleic anhydride in dimethylformamide according to the volume ratio of 5:7, adding hydroquinone accounting for 1% of the total amount of the maleic anhydride, stirring for 5-10min for full dissolution, adding 60-90 parts of coupling agent modified bagasse fibers according to the solid-liquid ratio of 1:20, continuously stirring, reacting at 100-105 ℃ for 4-5h, filtering, washing with acetone, and performing Soxhlet extraction in acetone for 20-24h to obtain maleic anhydride modified bagasse fibers;
(2) the interface modification treatment method of the silicon carbide powder comprises the following steps:
adding 1-2 parts of silane coupling agent A171 into 40-50 parts of 95% ethanol, stirring for hydrolysis, adding 7-8 parts of silicon carbide powder dried at 105-115 ℃ for 50-70min, stirring in an oil bath at 65-70 ℃ for 1-2h, cooling to room temperature, filtering, washing, and drying at 80-85 ℃ to obtain silicon carbide powder with organically modified surface;
(3) preparing a glue-free fiber board:
uniformly mixing 20-30 parts of alkali pretreated straw fiber, 1-2 parts of nano lanthanum oxide grafted on the surface and the materials obtained in the steps (1) and (2), dissolving 3.2-4.8 parts of ammonium polyphosphate 1:15 in water to prepare a solution, applying the solution to the mixture, drying the solution in a drying box at the temperature of 80-85 ℃, manually paving, pre-pressing and molding, sending the mixture into a hot press at the temperature of 180-190 ℃ for hot pressing for 5-15min, cooling and releasing the pressure to obtain the non-adhesive fiber board.
2. The method for preparing the non-glue fiber board as claimed in claim 1, wherein the coupling agent modification treatment method of the bagasse in the step (1) comprises the following steps:
putting 60-90 parts of bagasse fibers into a drying oven at 80-85 ℃ for drying for 5-6h, adding 6 mass percent acetone solution of silane coupling agent KH550 according to the solid-to-liquid ratio of 1:20, soaking for 45-48h, performing suction filtration, washing for 4-6 times with acetone, air-drying at room temperature for 23-25h, and then putting into an oven at 80-85 ℃ for drying for 20-24h to obtain the bagasse fibers modified by the coupling agent.
3. The method for preparing a binderless fiber sheet of claim 1 wherein the step (3) comprises the following steps:
20-30 parts of straw fiber is put into a modifier sodium hydroxide aqueous solution with the concentration of 8% according to the mass ratio of 1:20, after soaking treatment for 7-9h, separated and washed with water to be neutral, and dried in a drying oven at the temperature of 80-85 ℃ to constant weight, so that the alkali pretreated straw fiber is obtained.
4. The method for preparing the glue-free fiber board as claimed in claim 1, wherein the surface organization method of the nano lanthanum oxide in the step (3) comprises the following steps:
vacuum drying 1-2 parts of nano lanthanum sesquioxide at the temperature of 100-105 ℃ for 20-30min, dropwise adding acetic anhydride into 70 mass percent of acetone aqueous solution to adjust the pH value to 4-5, adding 0.1-0.2 part of silane coupling agent KH590, stirring and hydrolyzing, adding the vacuum dried nano lanthanum sesquioxide, carrying out ultrasonic oscillation for 30-40min after carrying out homogeneous dispersion for 10-20s, filtering, and carrying out vacuum drying to obtain the surface grafted nano lanthanum sesquioxide.
5. The method for preparing the non-adhesive fiber board as claimed in claim 1, wherein the drying in the step (3) is performed until the water content is 10-12% and the hot pressing pressure is 6-8 MPa.
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| CN114921119B (en) * | 2022-07-07 | 2024-02-20 | 宜兴市康辉耐火材料有限公司 | Silicon carbide coating with high heat conduction and high heat radiation and preparation method thereof |
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Application publication date: 20190820 Assignee: JIANGSU XINYI HUQIAN WOOD-BASED PANEL MANUFACTURING CO.,LTD. Assignor: FUYANG DAKE NEW MATERIAL CO.,LTD. Contract record no.: X2022980000919 Denomination of invention: A preparation method of glue free fiberboard Granted publication date: 20210514 License type: Common License Record date: 20220124 |