CN113442245B - Whole bamboo recombined bamboo and preparation method and application thereof - Google Patents
Whole bamboo recombined bamboo and preparation method and application thereof Download PDFInfo
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- CN113442245B CN113442245B CN202110101601.1A CN202110101601A CN113442245B CN 113442245 B CN113442245 B CN 113442245B CN 202110101601 A CN202110101601 A CN 202110101601A CN 113442245 B CN113442245 B CN 113442245B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
- B27J1/00—Mechanical working of cane or the like
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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
- B27K3/04—Impregnating in open tanks
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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
- 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
- B27K9/00—Chemical or physical treatment of reed, straw, or similar material
- B27K9/002—Cane, bamboo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing
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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
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
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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
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Forests & Forestry (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention provides a full bamboo recombined bamboo and a preparation method and application thereof, belonging to the technical field of bamboo-based composite materials. The method comprises the steps of cutting raw bamboo into bamboo segments, and splitting the bamboo segments to obtain bamboo chips; soaking the bamboo chips in hot water to obtain soaked bamboo chips; performing roasting treatment on the soaked bamboo chips on flame to obtain roasted bamboo chips; sequentially carrying out rolling treatment and first drying on the roasted bamboo chips to obtain dried bamboo fiber chips; sequentially carrying out gum dipping treatment and secondary drying on the dried bamboo fiber sheets to obtain dried gum dipped bamboo fiber sheets; paving the dried impregnated bamboo fiber sheets along the full grain direction, paving a layer of expanded perlite between two adjacent layers of dried impregnated bamboo fiber sheets, and then performing hot press forming to obtain the full bamboo recombined bamboo. The method provided by the invention has the advantages that the bamboo utilization rate is high, the full bamboo utilization can be basically realized, the processing efficiency is high, and finally the full bamboo recombined bamboo with excellent mechanical property, heat insulation property and sound insulation property can be obtained.
Description
Technical Field
The invention relates to the technical field of bamboo-based composite materials, in particular to a full-bamboo recombined bamboo, a preparation method and application thereof.
Background
The bamboo resources in China are rich, the chemical components of the bamboo are similar to that of wood, the bamboo comprises cellulose, hemicellulose and lignin, and the bamboo resources are utilized to replace the wood resources to manufacture the composite material which can be used in the fields of wall materials, furniture, indoor and outdoor decorations and the like. The recombined bamboo is a new bamboo material which reorganizes and strengthens the bamboo material. The common recombined bamboo is produced by processing bamboo into long bamboo strips or filaments, or grinding bamboo into bamboo filament bundles, drying, dipping, drying to the required water content, paving, and thermally curing at high temperature and high pressure. The common recombined bamboo has complicated processing, low efficiency, bamboo utilization rate of only about 90 percent, small porosity and poor heat preservation performance.
Disclosure of Invention
The invention aims to provide a full-bamboo recombined bamboo and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a full bamboo recombined bamboo, which comprises the following steps:
cutting raw bamboo into bamboo segments, and splitting the bamboo segments to obtain bamboo chips;
soaking the bamboo chips in hot water to obtain soaked bamboo chips;
performing roasting treatment on the soaked bamboo chips on flame to obtain roasted bamboo chips;
sequentially carrying out rolling treatment and first drying on the roasted bamboo chips to obtain dried bamboo fiber chips;
sequentially carrying out gum dipping treatment and secondary drying on the dried bamboo fiber sheets to obtain dried gum dipped bamboo fiber sheets;
paving the dried impregnated bamboo fiber sheets along the full grain direction, paving a layer of expanded perlite between two adjacent layers of dried impregnated bamboo fiber sheets, and then performing hot press forming to obtain the full bamboo recombined bamboo.
Preferably, the temperature of the hot water is 70-90 ℃, and the soaking treatment time is 4-6 hours.
Preferably, the temperature of the flame is 300-500 ℃; the time of the roasting treatment is 2-4 min, the distance between the soaked bamboo chips and the flame is 50-100 mm in the roasting treatment process, and the soaked bamboo chips are kept to be turned over.
Preferably, the pressure of the rolling treatment is 7000-10000 Pa; and the first drying is to dry the bamboo fiber sheet obtained after the rolling treatment to absolute dryness.
Preferably, the adhesive used in the gum dipping treatment is phenolic resin, and the gum dipping treatment time is 5-10 min; and the second drying is to dry the impregnated bamboo fiber sheet obtained after the impregnation treatment until the water content is 8-12%.
Preferably, the expanded perlite has a particle size of 60 to 70 mesh; the total mass of the expanded perlite is 3-5% of the total mass of the dry impregnated bamboo fiber sheet by an absolute dry meter.
Preferably, the temperature of the hot press molding is 140-170 ℃ and the time is 1-2 min/mm.
The application provides the full bamboo recombined bamboo prepared by the preparation method, which comprises a plurality of layers of bamboo fiber sheets arranged in a lamination manner and expanded perlite arranged between two adjacent layers of bamboo fiber sheets, wherein the bamboo fiber sheets and the expanded perlite are glued and fixed.
Preferably, the static bending strength of the whole bamboo recombined bamboo is 96-101 MPa, the sound insulation performance is 38-43 dB, and the heat conductivity coefficient is 0.091-0.110W/(m.K).
The invention provides application of the whole bamboo recombined bamboo in wall materials.
The invention provides a preparation method of a full bamboo recombined bamboo, which comprises the following steps: cutting raw bamboo into bamboo segments, and splitting the bamboo segments to obtain bamboo chips; soaking the bamboo chips in hot water to obtain soaked bamboo chips; performing roasting treatment on the soaked bamboo chips on flame to obtain roasted bamboo chips; sequentially carrying out rolling treatment and first drying on the roasted bamboo chips to obtain dried bamboo fiber chips; sequentially carrying out gum dipping treatment and secondary drying on the dried bamboo fiber sheets to obtain dried gum dipped bamboo fiber sheets; paving the dried impregnated bamboo fiber sheets along the full grain direction, paving a layer of expanded perlite between two adjacent layers of dried impregnated bamboo fiber sheets, and then performing hot press forming to obtain the full bamboo recombined bamboo.
Compared with the common recombined bamboo preparation technology, the method does not need to process the bamboo into the thin bamboo strips, the bamboo filaments or the bamboo filament bundles and the like, not only greatly simplifies the material preparation working section, improves the production efficiency, but also avoids the loss of the bamboo caused by the processing of the thin bamboo strips, the bamboo filaments or the bamboo filament bundles and the like, remarkably improves the utilization rate of the bamboo, and basically realizes the full bamboo utilization. According to the invention, the bamboo chips are soaked in hot water, so that the bamboo chips can be softened, and the bamboo fiber chips connected in a fiber net shape can be formed by subsequent rolling treatment; meanwhile, in the soaking treatment process, low-sugar organic matters and the like in the bamboo chips are dissolved out, so that the risk of mildew of the finally obtained whole bamboo recombined bamboo can be reduced. The raw bamboo with the wax layer and the high-brittleness tabasheer are difficult to glue with the adhesive in the gum dipping treatment process, and the wax layer can be removed by baking the soaked bamboo chips on flame; meanwhile, the green bamboo, the meat bamboo and the yellow bamboo are further softened by utilizing a high-temperature and high-humidity environment, the bamboo fiber sheets connected in a fiber net shape are formed by subsequent rolling treatment, and the bonding strength is greatly improved. The invention is beneficial to improving the overall porosity of the obtained full bamboo recombined bamboo by adopting the expanded perlite, greatly improves the heat insulation performance and the sound insulation performance of the finally obtained full bamboo recombined bamboo, and is more suitable for being applied to the field of wall materials.
Detailed Description
The invention provides a preparation method of a full bamboo recombined bamboo, which comprises the following steps:
cutting raw bamboo into bamboo segments, and splitting the bamboo segments to obtain bamboo chips;
soaking the bamboo chips in hot water to obtain soaked bamboo chips;
performing roasting treatment on the soaked bamboo chips on flame to obtain roasted bamboo chips;
sequentially carrying out rolling treatment and first drying on the roasted bamboo chips to obtain dried bamboo fiber chips;
sequentially carrying out gum dipping treatment and secondary drying on the dried bamboo fiber sheets to obtain dried gum dipped bamboo fiber sheets;
paving the dried impregnated bamboo fiber sheets along the full grain direction, paving a layer of expanded perlite between two adjacent layers of dried impregnated bamboo fiber sheets, and then performing hot press forming to obtain the full bamboo recombined bamboo.
The invention cuts the raw bamboo into bamboo segments, and the bamboo segments are split to obtain bamboo chips. In the present invention, the raw bamboo is preferably fresh raw bamboo. In the present invention, the length of the bamboo section is preferably 1200 to 1400mm, more preferably 1300mm. The specific method for cutting the raw bamboo into bamboo segments is not particularly limited, and the bamboo segments with the required length can be obtained. The invention preferably divides each section of bamboo Duan Poufen into four equal sections of bamboo chips, the specific method of the subdivision is not particularly limited, and the method known by the person skilled in the art can be adopted; in the embodiment of the invention, each section of bamboo Duan Poufen is divided into four equal sections of bamboo chips by a bamboo cutting machine.
After the bamboo chips are obtained, the bamboo chips are soaked in hot water to obtain the soaked bamboo chips. In the present invention, the temperature of the hot water is preferably 70 to 90 ℃, and may be 70 ℃, 80 ℃ or 90 ℃, and the soaking treatment time is preferably 4 to 6 hours, and may be 4 hours, 5 hours or 6 hours. According to the invention, the bamboo chips are soaked in hot water, so that the bamboo chips can be softened, and the bamboo fiber chips connected in a fiber net shape can be formed by subsequent rolling treatment; meanwhile, in the soaking treatment process, low-sugar organic matters and the like in the bamboo chips are dissolved out, so that the risk of mildew of the finally obtained whole bamboo recombined bamboo can be reduced.
After the soaked bamboo chips are obtained, the soaked bamboo chips are subjected to roasting treatment on flame, so that the roasted bamboo chips are obtained. In the invention, the temperature of the flame is preferably 300-500 ℃, and can be 300 ℃, 400 ℃ or 500 ℃; the time of the baking treatment is preferably 2-4 min, and specifically can be 2min, 3min or 4min. In the invention, the distance between the soaked bamboo chips and the flame in the baking treatment process is preferably 50-100 mm, and can be particularly 50mm, 70mm or 100mm; the soaking bamboo chips are placed above the flame horizontally for roasting treatment, and the distance between the soaking bamboo chips and the flame is based on the distance between the center of the soaking bamboo chips and the flame. In the invention, the soaking bamboo chips are kept turned over in the process of the roasting treatment, and the turning rate of the soaking bamboo chips is not particularly limited, so that the green bamboo and yellow bamboo of each soaking bamboo chip are fully and uniformly roasted. The raw bamboo with the wax layer and the high-brittleness tabasheer are difficult to glue with the adhesive in the gum dipping treatment process, and the wax layer can be removed by baking the soaked bamboo chips on flame; meanwhile, the green bamboo, the meat bamboo and the yellow bamboo are further softened by utilizing a high-temperature and high-humidity environment, the bamboo fiber sheets connected in a fiber net shape are formed by subsequent rolling treatment, and the bonding strength is greatly improved.
After the roasted bamboo chips are obtained, the roasted bamboo chips are sequentially rolled and subjected to first drying, so that the dried bamboo fiber chips are obtained. In the present invention, the pressure of the rolling treatment is preferably 7000 to 10000Pa, and specifically 7000Pa, 8000Pa, 9000Pa or 10000Pa; in an embodiment of the invention, the rolling treatment is performed in particular in a roller mill. In the invention, after the baking treatment is finished, the obtained baked bamboo chips are placed in a roller mill for rolling treatment, so that the baked bamboo chips are changed into sheet-shaped bamboo fiber bundles with loose surfaces connected in a staggered manner and the original fiber arrangement direction is maintained. In the invention, the first drying is specifically to dry the bamboo fiber sheet obtained after the rolling treatment to absolute dryness; in an embodiment of the invention, the first drying is performed in particular in a drying kiln. The invention rolls the roasted bamboo chips into the bamboo fiber chips connected in a fiber net shape through rolling treatment, and then dries to absolute dryness so as to fully impregnate the adhesive in the subsequent impregnation treatment process.
After the dried bamboo fiber sheet is obtained, the invention sequentially carries out gum dipping treatment and secondary drying on the dried bamboo fiber sheet to obtain the dried gum dipping bamboo fiber sheet. In the invention, the adhesive used in the gum dipping treatment is preferably phenolic resin, and the solid content of the phenolic resin is preferably 45-55wt%, and can be 45wt%, 50wt% or 55wt%; the time of the gum dipping treatment is preferably 5-10 min, and can be specifically 6min, 7min or 8min. The invention preferably dries the impregnated bamboo fiber sheet obtained after the impregnation treatment and then carries out second drying, wherein the second drying is specifically that the impregnated bamboo fiber sheet obtained after the drying is dried until the water content is 8-12%, preferably 10%; in an embodiment of the invention, the second drying is performed in particular in a drying kiln.
After the dried impregnated bamboo fiber sheets are obtained, paving the dried impregnated bamboo fiber sheets along the full grain direction, paving a layer of expanded perlite between two adjacent layers of dried impregnated bamboo fiber sheets, and then performing hot press forming to obtain the full bamboo recombined bamboo. In the invention, the dry impregnated bamboo fiber sheets are paved on a mould along the full grain direction, in the paving process, a layer of expanded perlite is paved between two adjacent layers of dry impregnated bamboo fiber sheets, then the mould is communicated with the dry impregnated bamboo fiber sheets for hot press forming, and demoulding is carried out to obtain the full bamboo recombined bamboo. In the present invention, the expanded perlite preferably has a particle size of 60 to 70 mesh; the total mass of the expanded perlite is preferably 3-5% of the total mass of the dry impregnated bamboo fiber sheet by an absolute dry basis, and can be 3%, 4% or 5% specifically. In the invention, the temperature of the hot press molding is preferably 140-170 ℃, and can be 140 ℃, 150 ℃, 160 ℃ or 170 ℃; the time of hot press forming is preferably 1-2 min/mm, and can be specifically 1min/mm, 1.2min/mm, 1.5min/mm or 2min/mm, and the time of hot press forming is specifically 1-2 min per 1mm thickness by taking the thickness of the finished product of the whole bamboo recombined bamboo as a reference. In an embodiment of the invention, the hot press forming is performed in particular in a hot press. The invention is beneficial to improving the overall porosity of the obtained full bamboo recombined bamboo by adopting the expanded perlite, greatly improves the heat insulation performance and the sound insulation performance of the finally obtained full bamboo recombined bamboo, and is more suitable for being applied to the field of wall materials.
The invention provides the full-bamboo recombined bamboo prepared by the preparation method, which comprises a plurality of layers of bamboo fiber sheets arranged in a laminated way and expanded perlite arranged between two adjacent layers of bamboo fiber sheets, wherein the bamboo fiber sheets and the expanded perlite are glued and fixed. The full-bamboo recombined bamboo provided by the invention has excellent mechanical property, heat insulation property and sound insulation property, the static bending strength of the full-bamboo recombined bamboo is 96-101 MPa, the sound insulation property is 38-43 dB, and the heat conductivity coefficient is 0.091-0.110W/(m.K).
The invention provides application of the whole bamboo recombined bamboo in wall materials. The present invention is not particularly limited to the application, and may be carried out by methods well known to those skilled in the art.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Cutting fresh raw bamboo into bamboo segments with the length of 1300mm, cutting the bamboo Duan Poufen into four equal-divided bamboo chips by a bamboo cutting machine, and soaking the bamboo chips in hot water at 90 ℃ for 6 hours to obtain soaked bamboo chips;
the soaked bamboo chips are roasted for 4 minutes on flame with the temperature of 300 ℃ transversely, the distance between the soaked bamboo chips and the flame is 50mm, and the soaked bamboo chips are roasted while being turned over, so that the green and yellow of each soaked bamboo chip are roasted uniformly and fully, and roasted bamboo chips are obtained;
immediately conveying the roasted bamboo chips to a roller mill, rolling under the condition that the pressure is 90000Pa, rolling the roasted bamboo chips into bamboo fiber chips connected in a fiber net shape, and then conveying the bamboo fiber chips into a drying kiln to be dried until the bamboo fiber chips are absolute dry, so as to obtain dried bamboo fiber chips;
putting the dried bamboo fiber sheets into a phenolic resin glue pool with the solid content of 45 weight percent for glue dipping for 6 minutes, taking out, airing, and then putting into a drying kiln again for drying until the water content is 10 percent to obtain the dried glue-dipped bamboo fiber sheets;
paving the dried impregnated bamboo fiber sheets on a die along the full grain direction, and paving a layer of expanded perlite with the granularity of 60 meshes between two adjacent layers of dried impregnated bamboo fiber sheets, wherein the total mass of the expanded perlite is 5% of the total mass of the dried impregnated bamboo fiber sheets by an absolute dry meter; and then the mould and the dried impregnated bamboo fiber sheets are sent into a hot press together, hot press molding is carried out at 160 ℃ for 1.5min/mm, and demoulding is carried out, so that the full bamboo recombined bamboo is obtained.
Example 2
Cutting fresh raw bamboo into bamboo segments with the length of 1300mm, cutting the bamboo Duan Poufen into four equal-divided bamboo chips by a bamboo cutting machine, and soaking the bamboo chips in hot water at 80 ℃ for 5 hours to obtain soaked bamboo chips;
the soaked bamboo chips are roasted for 3min on flame with the temperature of 400 ℃, the distance between the soaked bamboo chips and the flame is 70mm, and the soaked bamboo chips are turned over while being roasted, so that the green and yellow of each soaked bamboo chip are roasted uniformly and fully, and roasted bamboo chips are obtained;
immediately conveying the roasted bamboo chips to a roller mill, rolling under the condition that the pressure is 80000Pa, rolling the roasted bamboo chips into bamboo fiber chips connected in a fiber net shape, and then conveying the bamboo fiber chips into a drying kiln for drying until the bamboo fiber chips are absolute dry, thus obtaining dried bamboo fiber chips;
placing the dried bamboo fiber sheets into a phenolic resin glue pool with the solid content of 50wt% for glue dipping for 7min, taking out, airing, and then sending into a drying kiln again for drying until the water content is 10%, thus obtaining the dried glue dipped bamboo fiber sheets;
paving the dried impregnated bamboo fiber sheets on a die along the full grain direction, and paving a layer of expanded perlite with the granularity of 70 meshes between two adjacent layers of dried impregnated bamboo fiber sheets, wherein the total mass of the expanded perlite is 3% of the total mass of the dried impregnated bamboo fiber sheets by an absolute dry meter; and then the mould and the dried impregnated bamboo fiber sheets are sent into a hot press together, hot press molding is carried out at 170 ℃ for 1.2min/mm, and demoulding is carried out, so that the full bamboo recombined bamboo is obtained.
Example 3
Cutting fresh raw bamboo into bamboo segments with the length of 1300mm, cutting the bamboo Duan Poufen into four equal-divided bamboo chips by a bamboo cutting machine, and soaking the bamboo chips in hot water at 70 ℃ for 4 hours to obtain soaked bamboo chips;
the soaked bamboo chips are roasted for 2 minutes on flame with the temperature of 500 ℃ transversely, the distance between the soaked bamboo chips and the flame is 100mm, and the soaked bamboo chips are turned over while being roasted, so that the green and yellow of each soaked bamboo chip are roasted uniformly and fully, and roasted bamboo chips are obtained;
immediately conveying the roasted bamboo chips to a roller mill, rolling under the condition that the pressure is 7000Pa, rolling the roasted bamboo chips into bamboo fiber chips connected in a fiber net shape, and then conveying the bamboo fiber chips into a drying kiln for drying until the bamboo fiber chips are absolute dry to obtain dried bamboo fiber chips;
putting the dried bamboo fiber sheets into a phenolic resin glue pool with the solid content of 55wt% for glue dipping for 8min, taking out, airing, and then putting into a drying kiln again for drying until the water content is 10%, thus obtaining the dried glue dipped bamboo fiber sheets;
paving the dried impregnated bamboo fiber sheets on a die along the full grain direction, and paving a layer of expanded perlite with the granularity of 70 meshes between two adjacent layers of dried impregnated bamboo fiber sheets, wherein the total mass of the expanded perlite is 3% of the total mass of the dried impregnated bamboo fiber sheets by an absolute dry meter; and then the mould and the dried impregnated bamboo fiber sheets are sent into a hot press together, hot press molding is carried out at 150 ℃ for 2min/mm, and demoulding is carried out, so that the whole bamboo recombined bamboo is obtained.
Comparative example 1
The common recombined bamboo is prepared by adopting the traditional method, and the steps are as follows:
processing fresh raw bamboo into strip bamboo splits with the dimensions (length, width, thickness) of 1300mm, 40mm and 10mm; the thin bamboo strips are sent into a drying kiln to be dried until the thin bamboo strips are absolute dry, and then the dried thin bamboo strips are obtained; placing the dried bamboo splits into a phenolic resin glue pool with the solid content of 50wt% for glue dipping for 8min, taking out, airing, and then sending into a drying kiln again for drying until the water content is 10%, thus obtaining the dried glue-dipped bamboo splits; paving the dried impregnated bamboo strips on a die along the full grain direction, then feeding the die and the dried impregnated bamboo strips into a hot press together, carrying out hot press forming at 155 ℃ for 1.5min/mm, and demoulding to obtain the common recombined bamboo.
The performance test was performed on the whole bamboo recombinant bamboos prepared in examples 1 to 3 and the general recombinant bamboos prepared in comparative example 1, and the standards and performance data according to the test are shown in table 1.
Table 1 results of Performance test of the whole bamboo recombinant bamboos in examples 1 to 3 and the ordinary recombinant bamboos in comparative example 1
| Static bending strength (MPa) | Sound insulation performance (dB) | Coefficient of thermal conductivity (W/(m.K)) | |
| Standard of | LYT3194-2020 | GB/T19889.3-2005 | GBT32981-2016 |
| Comparative example 1 | 95 | 25 | 0.210 |
| Example 1 | 101 | 38 | 0.098 |
| Example 2 | 98 | 43 | 0.091 |
| Example 3 | 96 | 40 | 0.110 |
As can be seen from Table 1, the whole bamboo composite bamboo prepared in examples 1 to 3 has not only static bending strength exceeding that of comparative example 1, but also sound insulation performance far superior to that of comparative example 1, and thermal conductivity significantly lower than that of comparative example 1, indicating that the whole bamboo composite bamboo prepared in examples 1 to 3 is more suitable for use as wall material than that of comparative example 1.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A preparation method of a whole bamboo recombined bamboo comprises the following steps in sequence:
cutting raw bamboo into bamboo segments, and splitting the bamboo segments to obtain bamboo chips;
soaking the bamboo chips in hot water at the temperature of 70-90 ℃ for 4-6 hours to obtain soaked bamboo chips;
performing roasting treatment on the soaked bamboo chips on flame, wherein the temperature of the flame is 300-500 ℃, so as to obtain roasted bamboo chips;
sequentially carrying out rolling treatment and first drying on the roasted bamboo chips to obtain dried bamboo fiber chips;
sequentially carrying out gum dipping treatment and secondary drying on the dried bamboo fiber sheets to obtain dried gum dipped bamboo fiber sheets; the adhesive used in the gum dipping treatment is phenolic resin, and the gum dipping treatment time is 6-8 min;
paving the dried impregnated bamboo fiber sheets along the full grain direction, paving a layer of expanded perlite between two adjacent layers of dried impregnated bamboo fiber sheets, and then performing hot press forming at the temperature of 150-170 ℃ for 1-2 min/mm to obtain the full bamboo recombined bamboo; the granularity of the expanded perlite is 60-70 meshes; the total mass of the expanded perlite is 3-5% of the total mass of the dry impregnated bamboo fiber sheet by an absolute dry meter;
the static bending strength of the whole bamboo recombined bamboo is 96-101 MPa, the sound insulation performance is 38-43 dB, and the heat conductivity coefficient is 0.091-0.110W/(m.K).
2. The method according to claim 1, wherein the baking treatment is performed for 2-4 min, the distance between the soaked bamboo chips and the flame is 50-100 mm, and the soaked bamboo chips are kept turned over during the baking treatment.
3. The production method according to claim 1, wherein the pressure of the rolling treatment is 7000 to 10000pa; and the first drying is to dry the bamboo fiber sheet obtained after the rolling treatment to absolute dryness.
4. The method according to claim 1, wherein the second drying is to dry the impregnated bamboo fiber sheet obtained after the impregnation treatment to a water content of 8-12%.
5. The whole-bamboo recombined bamboo prepared by the preparation method of any one of claims 1-4 comprises a plurality of layers of bamboo fiber sheets arranged in a laminated manner and expanded perlite arranged between two adjacent layers of bamboo fiber sheets, wherein the bamboo fiber sheets and the expanded perlite are glued and fixed.
6. The use of the whole bamboo recombinant bamboo according to claim 5 in wall materials.
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| JPH10102612A (en) * | 1996-09-30 | 1998-04-21 | Ig Tech Res Inc | Composite heat insulation plate |
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