CN114714459B - Outdoor high weather-resistant bamboo recombinant material and manufacturing method thereof - Google Patents

Outdoor high weather-resistant bamboo recombinant material and manufacturing method thereof Download PDF

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Publication number
CN114714459B
CN114714459B CN202210360796.6A CN202210360796A CN114714459B CN 114714459 B CN114714459 B CN 114714459B CN 202210360796 A CN202210360796 A CN 202210360796A CN 114714459 B CN114714459 B CN 114714459B
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bamboo
treatment
temperature
weather
resistant
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CN114714459A (en
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李婷
牟群英
黄艳君
李霞镇
李贤军
薛志成
朱愿
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Central South University of Forestry and Technology
Hunan Taohuajiang Bamboo Science and Technology Co Ltd
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Central South University of Forestry and Technology
Hunan Taohuajiang Bamboo Science and Technology Co Ltd
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Priority to PCT/CN2023/086441 priority patent/WO2023193740A1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing
    • 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
    • B27N3/12—Moulding of mats 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
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or 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
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • 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
    • B27K2240/20—Removing fungi, molds or insects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

The invention discloses an outdoor high weather-proof bamboo recombinant material and a manufacturing method thereof. The outdoor high weather-resistant bamboo recombinant material prepared by the invention has the advantages of strong weather resistance, high strength, color tone close to that of bamboo, and the like, can meet the requirements of outdoor bamboo engineering materials and engineering member production and manufacture, and can be widely applied to the field of modern bamboo structure building engineering.

Description

Outdoor high weather-resistant bamboo recombinant material and manufacturing method thereof
Technical Field
The invention belongs to the field of bamboo-wood composite reconstituted bamboo in the wood industry, relates to an outdoor bamboo reconstituted material and a manufacturing method thereof, and in particular relates to an outdoor high-weather-resistance bamboo reconstituted material with high strength and high weather resistance and a manufacturing method thereof.
Background
The bamboo has the characteristics of rich resources, short growth period, high strength-to-weight ratio and the like, and under the great background of increasingly deficient wood resources, reasonable development and utilization of the bamboo resources have become an important way for relieving the shortage of the wood resources. Under the drive of development concept of 'taking bamboo as a substitute for wood', taking bamboo as raw material, splitting the bamboo into thin bamboo strips or fluffing the thin bamboo strips into bamboo bundles, carrying out sizing and assembly treatment, and then recombining and pressing the thin bamboo strips into a board with controllable breadth size under the conditions of high temperature and high pressure.
Bamboo is a natural biomass material rich in polysaccharide substances such as starch, and the like, and is extremely easy to produce decay and mildew phenomena in the use process, so that the apparent quality of the product is influenced, and the service life of the product is seriously reduced. Because the bamboo material is poor in permeability, the conventional chemical soaking type and brushing type anti-corrosion mildew-proof treatment is difficult to realize the long-acting performance of the weather resistance of the product, the prior art mostly adopts a high-temperature steam carbonization method to pretreat the bamboo material, the method can improve the weather resistance of the bamboo material, but the product is dark brown, the natural color tone of the bamboo material is lost, the processing energy consumption is high, meanwhile, the mechanical strength of the product can be obviously reduced, the application of the product in various fields with high strength requirements is limited, and the further expansion of the application field of the product and the promotion of the market competitiveness of the product are finally severely restricted. Therefore, how to obtain the outdoor high-weather-resistance bamboo recombinant material which has strong weather resistance and high strength and is close to the natural color of bamboo and the preparation method thereof can meet the processing and manufacturing requirements of outdoor bamboo engineering materials and engineering components, and has important significance for expanding the application field of bamboo and improving the added value of bamboo products.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the outdoor high weather-resistant bamboo recombinant material which has strong weather resistance and high strength and is close to the natural color of bamboo and the manufacturing method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme.
A manufacturing method of an outdoor high weather-resistant bamboo recombinant material comprises the following steps:
s1, performing high-temperature steam sterilization treatment on a bamboo unit at 110-125 ℃, drying and balancing until the water content is 30-60%, and performing biological pretreatment to obtain a pretreated bamboo unit, wherein the biological pretreatment is white rot fungi pretreatment;
s2, performing primary steaming treatment on the pretreated bamboo units in water at the temperature of 90-95 ℃ and draining to obtain bamboo units subjected to primary steaming treatment;
s3, carrying out saturated steam carbonization treatment on the bamboo unit subjected to primary steaming treatment at the temperature of 100-140 ℃ and the pressure of 0.1-0.3 MPa to obtain a carbonized bamboo unit;
s4, performing secondary steaming treatment on the carbonized bamboo units at the temperature of 60-80 ℃ to prevent mildew and corrosion, and drying and balancing until the water content is less than or equal to 18% to obtain the secondary steamed bamboo units, wherein secondary steaming treatment liquid comprises water, isothiazolinone emulsifiable concentrate, boric acid and borax;
s5, performing gum dipping, drying and balancing treatment on the bamboo units subjected to the secondary cooking treatment, performing assembly, hot press forming treatment and performing post treatment to obtain the outdoor high weather-resistant bamboo recombinant material.
In the above method for producing a highly weather-resistant bamboo composite material for outdoor use, preferably, in step S1, the pretreatment with white rot fungi is as follows: spraying white rot fungi culture solution on the surface of the bamboo unit after drying and balancing, spraying white rot fungi solution on the surface of the bamboo unit according to 1-20% of inoculation amount for inoculation treatment, and treating the bamboo unit after inoculation treatment for 5-20 days in a constant temperature and humidity environment with the temperature of 18-40 ℃ and the humidity of 45-90% to obtain a pretreated bamboo unit; the white rot fungi are one or more of Phanerochaete chrysosporium (P.chrysosporium), acremonium sweater (E.taxodii) and Coriolus versicolor (T.veri.).
In the method for manufacturing the outdoor high weather-resistant bamboo recombinant material, preferably, the preparation process of the white rot fungi culture solution is as follows: mixing potato glucose culture medium, agar and distilled water at a mass ratio of 1:1:50, stirring, adding or not adding supplemental inducer, sterilizing to obtain white rot fungus culture solution, wherein the supplemental inducer comprises Mn 2+ One or more of a saccharide and an amino acid aromatic compound; the white rot fungi liquid is formed by mixing white rot fungi and water, and the mass ratio of the white rot fungi to the water is 1:10-100.
In the method for producing the outdoor high weather-resistant bamboo recombinant material, preferably, the bamboo units subjected to the inoculation treatment are horizontally placed on a layer frame of a constant temperature and humidity room for constant temperature and humidity treatment, the layer spacing of the layer frame is 15 cm-25 cm, the bottommost layer of the layer frame is more than or equal to 20cm from the ground, the ventilation treatment frequency of the constant temperature and humidity room is 2 times/Zhou times/week, the ventilation treatment time is 20 min/time to 40 min/time, and the gas flow rate of the ventilation treatment is 0.01m 3 /min～0.1m 3 /min。
In the method for producing a highly weather-resistant bamboo composite material for outdoor use, preferably, in step S3, the oxygen content is kept at < 2% during the saturated steam carbonization treatment.
In the method for producing the outdoor high weather-resistant bamboo recombinant material, in the step S4, preferably, the secondary steaming treatment liquid comprises, by mass, 1% -4% of boric acid, 1% of borax, 0.5% -1% of isothiazolinone emulsifiable concentrate and 94% -97% of water.
In the above method for manufacturing the outdoor high weather-resistant bamboo recombinant material, preferably, in step S1, the bamboo unit includes a bamboo bundle unit or a bamboo skin unit, the bamboo bundle unit is obtained by splitting a bamboo tube into bamboo chips and then fluffing the bamboo chips, the bamboo skin unit is obtained by splitting a bamboo tube into bamboo chips and then splitting the bamboo chips into bamboo skin, and the time of the high-temperature steam sterilization treatment is 15min to 60min; and/or, in the step S2, the time of the primary stewing treatment is 0.5-2 h; and/or in the step S3, the time of the saturated steam carbonization treatment is 1-2 h; and/or in the step S4, the time of the secondary cooking treatment is 0.5-3 h.
In the method for producing a highly weather-resistant bamboo composite material for outdoor use, in step S4, the equipment used for drying is preferably a kiln or a mesh belt dryer, the drying temperature is 50 to 80 ℃, the temperature of the equilibration treatment is 20 to 30 ℃, and the relative humidity of the equilibration treatment is 50 to 70%.
In the above method for manufacturing a highly weather-resistant bamboo composite material for outdoor use, preferably, in step S5, the impregnation is performed by an atmospheric impregnation method or a pressure impregnation method, and the pressure impregnation method comprises the following steps: placing the bamboo units subjected to the secondary steaming treatment in high-pressure impregnation equipment for pre-vacuum treatment, maintaining for 6-15 min, adding phenolic resin adhesive with the solid content of 20-35% until the bamboo units are completely immersed, impregnating for 5-10 min under the pressure condition of 0.5-1.2 MPa, and then releasing pressure and draining.
In the method for producing a highly weather-resistant bamboo recombinant material for outdoor use, the drying temperature is preferably 50 to 60 ℃, and the drying time is preferably 0.5 to 3 days; the temperature of the balance treatment is 20-35 ℃, the relative humidity of the balance treatment is 60-75%, and the time of the balance treatment is 7-15 days.
In the above method for producing the outdoor high weather-resistant bamboo composite material, the hot press forming is preferably one-step hot press forming, the hot press temperature is 130 ℃ to 155 ℃, the hot press pressure is 4.0MPa to 6.0MPa, and the temperature of the slab core layer is kept for 15min to 35min after the temperature reaches the set temperature.
In the above method for manufacturing the outdoor high weather-resistant bamboo recombinant material, the post-treatment is preferably a curing treatment and a machining treatment, wherein the curing treatment is to put the hot-pressed and formed slab in a close stack in an indoor environment for 7-14 days, and the machining treatment comprises edge cutting, sawing and sanding and thickness fixing treatment of the cured slab by adopting machining equipment.
The invention also provides the outdoor high weather-proof bamboo recombinant material prepared by the method for preparing the outdoor high weather-proof bamboo recombinant material.
Preferably, the outdoor high weather-resistant bamboo composite material has a natural color of bamboo or a color close to the natural color of bamboo, and has a density of 0.9g/cm 3 ～1.3g/cm 3 Static bending strength of the outdoor high weather-resistant bamboo recombinant material>100MPa, the elastic modulus of the outdoor high-weather-resistance bamboo recombinant material is more than or equal to 12GPa, and the mildew resistance of the outdoor high-weather-resistance bamboo recombinant material is 0 grade and the corrosion resistance is I grade.
In step S1 of the present invention:
the high-temperature steam sterilization treatment is to sterilize the bamboo units by adopting high-temperature steam so as to kill other miscellaneous bacteria possibly carried by the bamboo bundles and avoid the phenomenon of infection of other strains in the white rot fungus culture process. The water content of the bamboo units after the high-temperature steam sterilization treatment is controlled to be 30% -60%, and better growth conditions are provided for parasitic propagation of white rot fungi on the bamboo units as much as possible.
The biological pretreatment is based on the effect of selectively removing the low molecular nutrients and lignin in the bamboo based on white rot fungi (also called white rot fungi), can greatly reduce the content of the nutrients in the bamboo on the basis of ensuring the basic mechanical strength of the bamboo, effectively increase the fiber porosity and remarkably improve the permeability of the bamboo. The biological pretreatment is preferably white rot strains with low damage to the mechanical properties of bamboo bundles, such as Phanerochaete chrysosporium (P.chrysosporium), acremonium purpureum (E.taxodii) and Coriolus versicolor (T.veriacorus). The white rot fungi culture solution is used for culturing white rot fungi, and consists of three substances, namely potato glucose culture medium, agar and distilled water, and can be taken out to prepare a white board or be used as the culture solution after being stirred uniformly and sterilized at high temperature, and then is placed into an incubator for strain culture.
The layer spacing of the layer frame is preferably 15-25cm to ensure adequate ventilation conditions; the distance between the bottommost layer of the layer frame and the ground is more than or equal to 20cm so as to prevent the ground mixed bacteria from infecting bamboo units and further influence the culture and propagation of white rot fungi.
To promote fungus propagation and shorten pretreatment period, aeration treatment of constant temperature and humidity room is preferably carried out weekly, and the flow rate of aeration treatment is preferably controlled to be 0.01-0.1 m 3 And/min, the ventilation frequency is 2-3 times/week, and the ventilation time is 20-40 min/time.
In order to stimulate the secretion of lignin degrading enzyme of white rot fungi and promote the removal of lignin in bamboo units by white rot fungi, the pretreatment time of biological method is further shortened, and a proper amount of Mn can be added into the culture medium 2+ And supplementary inducers such as saccharides, amino acid aromatic compounds, etc.
In the step S2, the primary steaming treatment is based on biological pretreatment, so that polysaccharide substances such as starch and the like on the bamboo units can be removed better, the content of nutrient substances in the bamboo is further reduced, the permeability of the bamboo units is further improved, and the later mildew-proof and corrosion-proof treatment effect is improved.
In the step S3 of the invention, the saturated steam carbonization treatment is a process of carrying out thermal modification treatment on the bamboo bundles by taking saturated steam (namely saturated steam) with the temperature of 100-140 ℃ as a heat transfer medium, and the low-temperature saturated steam carbonization treatment is a process of carrying out thermal degradation and oxidative degradation reaction on the bamboo, thereby being beneficial to further discharging partial contents in bamboo guide pipes and pits, further improving the permeation and weather resistance of the bamboo on the basis of pretreatment and digestion treatment, obviously reducing the temperature compared with other heat treatment processes, saving energy, avoiding degradation of cellulose at high temperature to weaken the mechanical strength and color change of the cellulose, and keeping the bamboo in the color tone.
In the step S4, the secondary cooking treatment is based on the bamboo permeability improvement and the strong weather resistance of the mildew-proof and corrosion-proof treatment liquid, so that the mildew-proof, corrosion-proof, permeation and fixation effects of the bamboo can be further improved, and the outdoor weather resistance of the bamboo recombinant material can be further improved. The mildew-proof and corrosion-proof treatment liquid (namely secondary cooking treatment liquid) can be recycled, and can reduce sewage discharge on the basis of effectively saving production cost.
In step S5 of the present invention, the impregnation treatment may be performed by a pressurized impregnation method, or may be performed by an atmospheric impregnation method according to the performance requirements of the final product, so that the desired effect may be achieved.
Compared with the prior art, the invention has the advantages that:
(1) The method for manufacturing the outdoor high-weather-resistance bamboo recombinant material has the characteristics of high weather resistance (including mildew resistance and corrosion resistance) and high strength and maintains the original color tone of the bamboo material, realizes mildew resistance and corrosion resistance multi-stage coupling treatment effect, overcomes the defects of the prior art and breaks through the bottleneck of the prior art by adopting the multi-stage progressive coupling treatment method of 'white rot fungi pretreatment + primary digestion treatment + saturated steam carbonization + secondary digestion treatment'. The multi-step progressive coupling treatment method is based on a multi-step progressive selective removal mode of the chemical groups of the bamboo body, not only selectively eliminates microbial nutrition sources of the bamboo body, but also promotes the formation of a multi-level pore structure of the bamboo body, realizes the efficient permeation, uniform distribution and long-term fixation of mildew-proof preservative and adhesive in the bamboo, remarkably improves the weather-proof durability of the bamboo recombinant material, and maintains the color and high-strength manufacture of the bamboo.
The preparation method has obvious coupling effect among multiple steps, adopts a stepwise design mode, firstly, the low-molecular nutrient substances and a small part of lignin in the bamboo are decomposed through white rot fungi pretreatment (step S1), the nutrient substance content in the bamboo is greatly reduced, the micro-porosity in the cell wall of the bamboo is effectively increased, meanwhile, the cell pit structure is destroyed through the growth and the extension of hyphae, the permeability of the bamboo is improved, the mildew-proof corrosion-proof and outdoor weather resistance of the bamboo is improved from the angle of reducing the nutrient substance content in the bamboo, more micro-pores are formed in the cell wall through the degradation of the white rot fungi, and the micro-fluid channels between cells are opened; the subsequent primary steaming treatment (step S2) +saturated steam carbonization treatment (step S3) promotes better dissolution of nutrient substances in the bamboo and further strengthening of a multi-stage void structure in the bamboo on the basis of biological pretreatment, at the moment, moisture and saturated steam are easier to permeate, nutrient substances are easier to migrate, and meanwhile, mildew-proof and corrosion-proof treatment medicaments (secondary steaming treatment liquid) in the secondary steaming treatment stage (step S4) can enter the cell cavities and cell walls of the bamboo more easily, so that the mildew-proof and corrosion-proof treatment effects of the medicaments in the later stage are enhanced.
From the above, the biological pretreatment in step S1 has the effect of enhancing and coupling the whole effect and the subsequent treatments.
The effect of the one-time cooking process of step S2 is mainly represented by: firstly, white rot fungi are killed through high-temperature steaming treatment, so that excessive degradation of lignin of the bamboo material by fungi at the later stage is prevented, and the mechanical strength of the bamboo material is obviously reduced; and secondly, metabolites generated by white rot fungi are dissolved and removed in time, so that residual low-molecular nutrients in the bamboo are further dissolved and removed, microscopic and macroscopic pores of the bamboo are further enriched, and the permeability of the bamboo unit is further improved. The step S2 can further strengthen the effect of the step S1, meanwhile, the permeability of the bamboo material can be further improved through the step S2, and the processing effects of the subsequent step S3 and the step S4 are improved, so that the step S2 has a coupling effect on the step S3 and the step S4.
The effect of the saturated steam carbonization treatment in the step S3 is mainly expressed in that: under the action of saturated water vapor, the low molecular compounds and main components in the bamboo material can undergo thermal degradation and oxidative degradation reactions to different degrees, so that partial contents in the bamboo material are further discharged, microscopic and macroscopic pores in the bamboo material are further increased, and the permeability and mildew and corrosion resistance of the bamboo material are further improved. The step S2 can play a role in strengthening the treatment effect of the step S3, because the pores in the bamboo are increased through the treatment of the step S2, saturated steam is easier to enter the inside of the bamboo and the inside of the cell wall, and the low-molecular compounds and the main components in the bamboo can be thermally and oxidatively degraded to a greater extent. Through the processing of the step S3, the nutrient substances in the bamboo are further reduced, microscopic and macroscopic pores are further increased, the permeability of the bamboo is further improved, and the permeability of the mildew-proof and corrosion-proof treatment agent in the bamboo can be further improved when the subsequent step S4 is processed, so that the overall mildew-proof and corrosion-proof treatment effect of the bamboo is improved, and the step S3 has a coupling effect on the subsequent step S4.
(2) After high-temperature steam sterilization treatment, the water content is controlled to be 30% -60% through drying balance, and a propagation basis can be provided for subsequent biological pretreatment under the water content, and the control of the water content range is directly related to biological pretreatment effects. The invention adopts low-temperature saturated steam (the low temperature is relative to the high-temperature saturated steam in the prior art) with 100-140 ℃ to carbonize the bamboo units after one-time cooking, thereby effectively ensuring that the color of the bamboo keeps the primary color as much as possible.
(3) The high weather-resistant bamboo recombinant material for the outdoor has the characteristics of strong weather resistance, high strength, mild and agreeable bamboo color tone and the like, and can be widely applied to the requirements of outdoor structural use. The density of the bamboo recombinant material can reach 0.9-1.3 g/cm 3 The mildew-proof and corrosion-proof performance reaches the highest level, namely the mildew-proof performance is 0 level and the corrosion-proof performance is I level, the static bending strength is greater than 100MPa, the elastic modulus is more than or equal to 12GPa, the requirements of the production and the manufacture of outdoor bamboo engineering materials and engineering components can be met, and the composite material can be widely applied to the field of modern bamboo-wood structure building engineering.
Drawings
Fig. 1 is a process flow chart of a method for manufacturing a high weather-resistant bamboo composite material for outdoor use in example 1 of the present invention.
Detailed Description
The invention is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the invention is not limited thereby. The materials and instruments used in the examples below are all commercially available.
Example 1:
the method for manufacturing the high weather-resistant bamboo recombinant material for the outdoor use, as shown in fig. 1, comprises the following steps:
s1, biological pretreatment
S1.1, preparing bamboo bundles: fresh Mao Zhuju is split into bamboo tubes with the length of 2.15m, the bamboo tubes are split into bamboo strips with the width of 30mm by a bamboo tube splitting machine, the bamboo strips are subjected to green and yellow removal treatment, and then the bamboo strips are processed into bamboo bundles by a bamboo strip fluffer, so that the bamboo bundle units which are loose in the transverse direction and penetrate in the longitudinal direction are obtained.
S1.2, high-temperature steam sterilization treatment: and (3) placing the bamboo bundle unit in an autoclave with the temperature of 115 ℃, sterilizing by adopting high-temperature steam for 30min, taking out, and immediately transferring the bamboo bundle unit into a constant temperature and humidity room subjected to sterilization treatment for later use. The high-temperature steam sterilization treatment is used for killing other miscellaneous bacteria carried by the bamboo bundles, so that the possibility of infection of other strains in the subsequent white rot fungus culture process is avoided.
S1.3, drying balance treatment: and drying and balancing the bamboo bundle units subjected to high-temperature steam sterilization treatment in a constant temperature and constant humidity room with the temperature of (20+/-2) ℃ and the humidity of (50+/-5) percent for 3 days until the water content of the bamboo bundle units is regulated to 50% for later use, and providing better growth conditions for the subsequent bamboo bundle biological pretreatment.
S1.4, preparing white rot fungus liquid: the method comprises the steps of selecting Phanerochaete chrysosporium (P.chrysosporium) for pretreatment of white rot fungi by a biological method, inoculating the white rot fungi in a culture medium white plate, placing the white plate in an incubator, taking out the white rot fungi every day, observing the growth condition of the white rot fungi, ensuring the occurrence of sterile infection, taking out the white rot fungi after the bacterial plaque area is developed to 70% -80% of the white plate area, pouring the white rot fungi into a stainless steel pulverizer for pulverization, and uniformly mixing and modulating the white rot fungi pulverized material and distilled water according to the mass ratio of 1:60 for later use to obtain white rot fungi liquid.
Preparing white rot fungi culture solution: mixing potato glucose culture medium, agar and distilled water at a mass ratio of 1:1:50, stirring, and adding appropriate amount of Mn 2+ Mn in the mixed solution after being used as a supplementary inducer 2+ The concentration is controlled at 10mg/kg, and the white rot fungi culture solution is taken out after being placed in a high-temperature sterilization box for sterilization for 15min, and is put into an incubator for standby.
S1.5, biological pretreatment: uniformly spraying the white rot fungus culture solution onto the surface of the bamboo bundle unit subjected to the drying and balancing treatment in the step S1.3, uniformly spraying the white rot fungus culture solution onto the surface of the bamboo bundle unit according to 10% of inoculation amount for inoculation treatment, and inoculatingThe treated bamboo bundle units are horizontally stacked on a layer frame with the layer spacing of 25cm and the bottom layer of 30cm from the ground, and then are transferred to a constant temperature and constant humidity room with the temperature of (20+/-2) DEG C and the humidity of (60+/-5) percent for pretreatment for 10 days, so as to obtain the pretreated bamboo bundle units, wherein in the pretreatment process, the constant temperature and constant humidity room is subjected to forced ventilation treatment for 3 times per week, the ventilation time period is 30 min/time, and the ventilation flow rate is 0.1m 3 /min。
S2, primary steaming treatment: and (3) placing the bamboo bundle unit pretreated by a biological method into a water bath pool, completely immersing the bamboo bundle unit in water, continuously steaming and boiling for 1h at the temperature of 95 ℃, taking out the bamboo bundle unit, and draining for later use.
S3, saturated steam carbonization treatment: and (3) carbonizing the bamboo bundle unit subjected to primary steaming treatment for 1h under the saturated steam treatment condition that the temperature is 130 ℃ and the pressure is 0.2MPa to obtain the carbonized bamboo bundle unit, wherein the oxygen content is kept to be lower than 2% all the time in the carbonization treatment process.
S4, secondary steaming treatment: placing the bamboo bundle unit after carbonization treatment in a water bath, adding mildew-proof and corrosion-proof treatment liquid consisting of 3% boric acid, 1% borax, 1% isothiazolinone emulsifiable concentrate and 95% water according to mass fraction, completely immersing the bamboo bundle unit, performing secondary steaming treatment at the temperature of 70 ℃, continuously taking out after 2 hours to obtain the bamboo bundle unit after mildew-proof and corrosion-proof treatment, forcibly drying the bamboo bundle unit after mildew-proof and corrosion-proof treatment in a drying kiln at the temperature of 80 ℃ for 20 hours, taking out, and placing the bamboo bundle unit in a balancing chamber at the temperature of (23+/-2) ℃ and the relative humidity of (65+/-5) percent for balancing treatment until the water content of the bamboo bundle unit is reduced to about 16%, thus obtaining the bamboo bundle unit after secondary steaming treatment.
S5, gum dipping treatment: and (3) placing the bamboo bundle unit subjected to the secondary steaming treatment in a phenolic resin adhesive with the solid content of 25% under the normal temperature condition to be completely immersed, taking out and draining after the bamboo bundle unit is kept for 20min until no glue solution drops, and obtaining the bamboo bundle unit subjected to the glue dipping treatment.
S6, drying balance treatment: and drying the bamboo bundle unit subjected to gum dipping treatment in a conventional drying kiln at 55 ℃ for 2 days, taking out, and then transferring the bamboo bundle unit to a balance chamber with the ambient temperature of (23+/-2) ℃ and the relative humidity of (65+/-5) percent for balancing treatment for 7 days.
S7, performing hot press forming treatment on the plate blank: and (3) assembling and placing the dried and balanced bamboo bundle units on a backing plate according to the fiber direction, after the corresponding weight requirement is met, conveying the obtained plate blank together with the backing plate into a hot press through a conveying belt to carry out hot press forming treatment, controlling the temperature of a hot press plate blank core layer at 140 ℃, controlling the hot press pressure at 4.5MPa, controlling the hot press time to be 20 minutes after the temperature of the plate blank core layer reaches a set temperature, cooling and decompressing, and discharging the plate to obtain a light-color bamboo recombinant material plate blank primary product.
In other embodiments, the temperature of the slab core layer is 130-155 ℃, the pressure of hot press forming is 4.0-6.0 MPa, and the same or similar technical effects can be obtained when the temperature of the slab core layer reaches the set temperature and then is kept for 15-35 min.
S8, maintenance and machining treatment: stacking the light-colored bamboo recombinant material plate blanks, separating upper and lower forming plate blanks by using partition strips, and placing the light-colored bamboo recombinant material plate blanks in a balance warehouse for curing for 7 days; after curing, cutting edges, sawing, sanding, thickness fixing and other machining treatments are carried out on the molded plate blank after curing treatment by adopting a cutting saw, a sliding table saw and the like, so that a high weather-proof light-color bamboo recombination material finished product, namely the outdoor high weather-proof bamboo recombination material is obtained.
The outdoor high-weather-resistance bamboo composite material prepared in the embodiment is bamboo in the original color tone, and the performance parameters are shown in Table 1, namely the density of the outdoor high-weather-resistance bamboo composite material is 1.10g/cm 3 The static bending strength of the outdoor high weather-resistant bamboo recombinant material is 150MPa, the bending elastic modulus is 12GPa, the mildew resistance is 0 level, and the corrosion resistance is I level.
Comparative example 1:
a method for producing a bamboo recombinant bamboo, which is substantially the same as that of example 1, except that: the steps are different in sequence, step S4 is firstly carried out, and step S1 is carried out, namely, secondary cooking treatment (mildew-proof and corrosion-proof treatment), biological pretreatment, primary cooking treatment, saturated steam carbonization treatment, gum dipping treatment, drying balance treatment, slab hot press forming treatment, maintenance and machining treatment.
Comparative example 2:
a method for producing a bamboo recombinant bamboo, which is substantially the same as that of example 1, except that: the steps are different in sequence, step S4 is performed after step S1, and step S2 is performed, namely biological pretreatment, secondary steaming treatment (mildew-proof and corrosion-proof treatment), primary steaming treatment, saturated steam carbonization treatment, gum dipping treatment, drying balance treatment, slab hot press forming treatment, maintenance and machining treatment.
Comparative example 3:
a method for producing a bamboo recombinant bamboo, which is substantially the same as that of example 1, except that: the steps are different in sequence, step S3 is performed after step S1, and step S2 is performed, namely biological pretreatment, saturated steam carbonization treatment, primary cooking treatment, secondary cooking treatment, gum dipping treatment, drying balance treatment, slab hot press forming treatment, maintenance and machining treatment.
Example 2:
the invention relates to a manufacturing method of an outdoor high weather-resistant bamboo recombinant material, which comprises the following steps:
s1, biological pretreatment
S1.1, preparing a bamboo strip: fresh Mao Zhuju is split into bamboo tubes with the length of 1.55m, the bamboo tubes are split into bamboo strips with the width of 15mm by a bamboo tube splitting machine, and then the bamboo strips are split into thin bamboo strips with the thickness of 1-2 mm along the radial direction by a bamboo strip splitting machine, so that bamboo strip units are obtained.
S1.2, high-temperature steam sterilization treatment: placing the bamboo strip unit into an autoclave with the temperature of 120 ℃, sterilizing by adopting high-temperature steam for 20min, taking out, and immediately transferring into a constant temperature and humidity room after sterilization treatment for standby. The high-temperature sterilization treatment is used for killing other miscellaneous bacteria carried by the bamboo bundles.
S1.3, drying balance treatment: drying and balancing the bamboo strip units subjected to high-temperature steam sterilization treatment in a constant temperature and constant humidity room with the temperature of (25+/-2) ℃ and the humidity of (65+/-5) percent for 2 days until the water content of the bamboo strip units is regulated to 40 percent for later use, and providing better growth conditions for the subsequent biological pretreatment of the bamboo strips.
S1.4, preparing white rot fungus liquid: the white rot fungi are pretreated by adopting a biological method, the white rot fungi are placed in an incubator after being inoculated in a culture medium white plate by utilizing an inoculating needle, the white rot fungi are taken out and observed every day, the white rot fungi are taken out after the bacterial plaque area is developed to 80% -90% of the white board area, the white rot fungi are poured into a stainless steel pulverizer for pulverization, and the white rot fungi powder and distilled water are uniformly mixed according to the mass ratio of 1:60 for standby, so that the white rot fungi liquid is obtained.
Preparing white rot fungi culture solution: mixing potato glucose culture medium, agar and distilled water at a mass ratio of 1:1:50, stirring, adding appropriate amount of veratrole, controlling the concentration of veratrole in the mixed solution to be 0.50mmol/L, taking the mixture as a supplementary inducer, placing the mixture in a high-temperature sterilization box for sterilization treatment for 20min, taking out the mixture to obtain white rot fungi culture solution, and placing the white rot fungi culture solution in the culture box for later use.
S1.5, biological pretreatment: uniformly spraying the white rot fungus culture solution onto the surface of the bamboo strip unit subjected to the drying and balancing treatment, uniformly spraying the white rot fungus solution on the surface of the bamboo strip unit according to 20% of inoculation amount for inoculation treatment, horizontally stacking the bamboo strip unit subjected to inoculation treatment on a layer frame with the layer spacing of 20cm and the lowest layer height of 35cm, and then transferring to a constant temperature and humidity room with the temperature of (20+/-2) DEG C and the relative humidity of (60+/-5)% for pretreatment for 20 days. In the pretreatment process, forced ventilation treatment is carried out on the constant temperature and humidity room for 2 times per week, the ventilation time length is 30 min/time, and the ventilation flow rate is 0.05m 3 /min。
S2, primary steaming treatment: and (3) placing the bamboo strip units pretreated by a biological method into a water bath pool, completely immersing the bamboo strip units in water, continuously steaming and boiling the bamboo strip units for 2 hours at the temperature of 90 ℃, taking out the bamboo strip units, and draining for later use.
S3, saturated steam carbonization treatment: carbonizing the bamboo strip unit subjected to primary steaming treatment for 2 hours under saturated steam treatment condition with the temperature of 140 ℃ and the pressure of 0.3MPa to obtain the carbonized bamboo strip unit, wherein the oxygen content is kept to be lower than 2% all the time in the carbonization treatment process.
S4, secondary steaming treatment: placing the carbonized bamboo strip units in a water bath, adding mildew-proof and corrosion-proof treatment liquid consisting of 1.5% boric acid, 1% borax, 0.5% isothiazolinone emulsifiable concentrate and 97% water according to mass fraction, completely immersing the bamboo strip units, performing secondary steaming treatment at 80 ℃ for 3 hours, and taking out to obtain the mildew-proof and corrosion-proof treated bamboo strip units. And (3) forcibly drying the mildew-proof and corrosion-proof treated bamboo strip units in a drying kiln at 60 ℃ for 30 hours, taking out, and then placing the bamboo strip units in a balancing chamber at the temperature of (23+/-2) ℃ and the relative humidity of (65+/-5) percent for balancing treatment until the water content of the bamboo strip units is about 12 percent.
S5, gum dipping treatment of the bamboo strips: and (3) placing the bamboo strip units subjected to the drying and balancing treatment in a high-pressure dipping tank for pre-vacuum treatment, keeping for 6min, adding a phenolic resin adhesive with the solid content of 35% to enable the bamboo strip units to be completely immersed, then raising the pressure of the solution in the high-pressure dipping tank to 1.2MPa, keeping the pressure for 10min, releasing pressure, taking out the bamboo strip units, and draining to obtain the bamboo strip units subjected to the gum dipping treatment.
S6, drying balance treatment: the bamboo strip units after gum dipping treatment are dried in a conventional drying kiln at 60 ℃ for 1.5 days, taken out, and then transferred into an equilibrium chamber with the ambient temperature of (23+/-2) ℃ and the relative humidity of (65+/-5)% for carrying out equilibrium treatment for 7 days.
S7, performing hot press forming treatment on the plate blank: and (3) assembling and placing the bamboo split units subjected to the drying and balancing treatment on a backing plate according to the fiber direction, after the corresponding weight requirement is met, conveying the obtained plate blank together with the backing plate into a hot press through a conveying belt to carry out hot press forming treatment, controlling the core layer temperature of the hot press plate blank to be 130 ℃, controlling the hot press pressure to be 4.0MPa, controlling the hot press time to be 15 minutes after the core layer temperature of the plate blank reaches the set temperature, cooling and decompressing, and discharging the plate blank to obtain the light-color bamboo recombinant material plate blank primary product.
S8, maintenance and machining treatment: stacking the light-colored bamboo recombinant material plate blanks, separating upper and lower forming plate blanks by using partition strips, and placing the light-colored bamboo recombinant material plate blanks in a balance warehouse for curing for 7 days; after curing, cutting edges, sawing, sanding, thickness fixing and other machining treatments are carried out on the molded plate blank after curing treatment by adopting a cutting saw, a sliding table saw and the like, so that the outdoor high weather-proof light-color bamboo recombined bamboo is obtained.
The outdoor high-weather-resistance bamboo composite material prepared in the embodiment is bamboo in the original color tone, and the performance parameters are shown in Table 1, namely the density of the outdoor high-weather-resistance bamboo composite material is 1.12g/cm 3 The static bending strength of the outdoor high weather-resistant bamboo recombinant material is 155MPa, the bending elastic modulus is 14GPa, the mildew resistance is 0 level, and the corrosion resistance is I level.
The properties of the outdoor high weather-resistant bamboo composite material prepared in examples 1 to 2 and the bamboo composite bamboo prepared in comparative examples 1 to 3 were tested as shown in Table 1.
Table 1 shows the comparison of the properties of the highly weather-resistant bamboo recombinant material for outdoor use of examples 1-2 and the bamboo recombinant materials of comparative examples 1-3
Figure BDA0003585154720000101
Compared with the embodiment 1, the comparison 1 is firstly step S4, since the bamboo is subjected to the mildew-proof and corrosion-proof steaming treatment, the interior of the bamboo is not formed with sufficient macro-porous and micro-porous structures, the mildew-proof and corrosion-proof treatment agent is difficult to enter the cell cavities and the cell walls of the bamboo, a good treatment effect cannot be obtained naturally, and secondly, the mildew-proof and corrosion-proof treatment agent is adhered to the surface of the bamboo subjected to the mildew-proof and corrosion-proof steaming treatment, so that white rot fungi are difficult to inoculate, the aim of the white rot fungi pretreatment cannot be achieved, and in addition, the agent adhered to the surface of the bamboo is dissolved and decomposed due to the water solubility of the mildew-proof and corrosion-proof agent, so that the mildew-proof and corrosion-proof treatment effect of the bamboo is approaching zero. Compared with the embodiment 1, the comparison example 2 is that the step S4 is performed after the step S1, and then the step S2 and the step S3 are performed, because the mildew-proof and corrosion-proof treatment agent is permeated in the bamboo wood, the bamboo wood is pretreated by a biological method to form a certain degree of pore structure on the surface of the bamboo wood, but the internal porosity is still poor, so that the mildew-proof and corrosion-proof treatment agent is difficult to enter the cell cavities and the cell walls of the bamboo wood; and the steam boiling treatment and saturated steam treatment carried out later can dissolve and decompose a great part of mildew-proof and corrosion-proof treatment medicaments attached on the surface of the bamboo wood, thereby seriously affecting the treatment effect. Compared with the embodiment 1, the comparison example 3 is that the step S3 is performed after the step S1 and then the step S2 is performed, so that the moisture content in the bamboo is relatively low when the low-temperature saturated steam carbonization treatment is performed, the moisture content in the bamboo is far less than the saturated state, enough high-temperature high-pressure water cannot be generated in the bamboo, the soluble substances in the bamboo are difficult to dissolve and migrate out, and meanwhile, more microscopic and macroscopic pores are difficult to further form, so that the treatment effect is finally affected. Compared with the bamboo recombined bamboo prepared in the comparative examples 1-3 and the recombined bamboo produced in the prior art, the outdoor high weather-resistant bamboo recombined material provided by the invention obviously improves the high weather resistance of the bamboo, can maintain the excellent mechanical property and the color tone of the bamboo, and can meet the requirements of the current market on outdoor light color system bamboo structural building engineering materials.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or equivalent embodiments using the method and technical solution disclosed above without departing from the spirit and technical solution of the present invention. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present invention, which do not depart from the technical solution of the present invention, still fall within the scope of the technical solution of the present invention.

Claims (17)

1. The manufacturing method of the outdoor high weather-resistant bamboo recombinant material is characterized by comprising the following steps of:
s1, performing high-temperature steam sterilization treatment on a bamboo unit at 110-125 ℃, drying and balancing until the water content is 30-60%, and performing biological pretreatment to obtain a pretreated bamboo unit, wherein the biological pretreatment is white rot fungi pretreatment;
s2, performing primary steaming treatment on the pretreated bamboo units in water at the temperature of 90-95 ℃ and draining to obtain bamboo units subjected to primary steaming treatment;
s3, carrying out saturated steam carbonization treatment on the bamboo unit subjected to primary steaming treatment at the temperature of 100-140 ℃ and the pressure of 0.1-0.3 MPa to obtain a carbonized bamboo unit;
s4, performing secondary steaming treatment on the carbonized bamboo units at the temperature of 60-80 ℃ to prevent mildew and corrosion, and drying and balancing until the water content is less than or equal to 18% to obtain the secondary steamed bamboo units, wherein secondary steaming treatment liquid comprises water, isothiazolinone emulsifiable concentrate, boric acid and borax;
s5, performing gum dipping, drying and balancing treatment on the bamboo units subjected to the secondary cooking treatment, performing assembly, hot press forming treatment and performing post treatment to obtain the outdoor high weather-resistant bamboo recombinant material.
2. The method of producing a highly weather-resistant bamboo composite material for outdoor use according to claim 1, wherein in step S1, the white rot fungi pretreatment is: spraying white rot fungi culture solution on the surface of the bamboo unit after drying and balancing, spraying white rot fungi solution on the surface of the bamboo unit according to 1-20% of inoculation amount for inoculation treatment, and treating the bamboo unit after inoculation treatment for 5-20 days in a constant temperature and humidity environment with the temperature of 18-40 ℃ and the humidity of 45-90% to obtain a pretreated bamboo unit; the white rot fungi are Phanerochaete chrysosporiumP.chrysosporium) Achillea purpurea (Fr.) SingE.taxodii) And Coriolus versicolorT.versicolor) One or more of the following.
3. The method for producing a highly weather-resistant bamboo recombinant material for outdoor use according to claim 2, wherein the white rot fungi culture solution is prepared by the following steps: mixing potato glucose culture medium, agar and distilled water at a mass ratio of 1:1:50, and stirringHomogenizing, optionally adding supplementary inducer, sterilizing to obtain white rot fungi culture solution, wherein the supplementary inducer comprises Mn 2+ One or more of a saccharide and an amino acid aromatic compound; the white rot fungi liquid is formed by mixing white rot fungi and water, and the mass ratio of the white rot fungi to the water is 1:10-100.
4. The method for producing highly weather-resistant bamboo recombinant material for outdoor use according to claim 2, wherein the bamboo units subjected to the inoculation treatment are horizontally placed on a shelf of a constant temperature and humidity room for constant temperature and humidity treatment, the shelf spacing is 15cm to 25cm, the lowest layer of the shelf is not less than 20cm from the ground, the aeration treatment frequency of the constant temperature and humidity room is 2 times/Zhou times/week, the aeration treatment time is 20 min/time to 40 min/time, and the gas flow rate of the aeration treatment is 0.01m 3 /min～0.1 m 3 /min。
5. The method for producing a highly weather-resistant bamboo composite material for outdoor use according to claim 1, wherein in step S3, the oxygen content is maintained at < 2% during the saturated steam carbonization treatment.
6. The method according to claim 1, wherein in step S4, the secondary steaming treatment liquid comprises, by mass, 1% to 4% boric acid, 1% borax, 0.5% to 1% isothiazolinone emulsifiable concentrate, and 94% to 97% water.
7. The method of manufacturing a highly weather-resistant bamboo composite material for outdoor use according to claim 1, wherein in step S1, the bamboo unit is made of a bamboo bundle unit or a bamboo skin unit, the bamboo bundle unit is made of bamboo tubes split into bamboo chips and then split into bamboo bundles, the bamboo skin unit is made of bamboo tubes split into bamboo strips and then split into bamboo skin, and the high-temperature steam sterilization treatment time is 15min to 60min.
8. The method of producing a highly weather-resistant bamboo composite material for outdoor use according to claim 1, wherein in step S2, the time of the one-time steaming is 0.5 to 2 hours.
9. The method for producing a highly weather-resistant bamboo composite material for outdoor use according to claim 1, wherein in step S3, the time for the saturated steam carbonization treatment is 1 to 2 hours.
10. The method for producing a highly weather-resistant bamboo composite material for outdoor use according to claim 1, wherein in step S4, the time for the secondary steaming treatment is 0.5 to 3 hours.
11. The method according to any one of claims 1 to 10, wherein in step S4, the equipment used for drying is a drying kiln or a mesh belt dryer, the drying temperature is 50 to 80 ℃, the equilibrium treatment temperature is 20 to 30 ℃, and the relative humidity of the equilibrium treatment is 50 to 70%.
12. The method according to any one of claims 1 to 10, wherein in step S5, the dipping is performed by an atmospheric dipping method or a pressure dipping method, and the pressure dipping method comprises the steps of: placing the bamboo units subjected to the secondary steaming treatment in high-pressure impregnation equipment for pre-vacuum treatment, maintaining for 6-15 min, adding phenolic resin adhesive with the solid content of 20-35% until the bamboo units are completely immersed, impregnating for 5-10 min under the pressure condition of 0.5-1.2 MPa, and then releasing pressure and draining.
13. The method for producing a highly weather-resistant bamboo composite material for outdoor use according to any one of claims 1 to 10, wherein in step S5, the drying temperature is 50 to 60 ℃, and the drying time is 0.5 to 3 days; the temperature of the balance treatment is 20-35 ℃, the relative humidity of the balance treatment is 60-75%, and the time of the balance treatment is 7-15 days.
14. The method according to any one of claims 1 to 10, wherein in step S5, the hot press forming is one-time hot press forming, the hot press temperature is 130 to 155 ℃, the hot press pressure is 4.0 to 6.0MPa, and the temperature of the core layer of the slab is maintained for 15 to 35 minutes after the temperature reaches the set temperature.
15. The method according to any one of claims 1 to 10, wherein in step S5, the post-treatment is a curing treatment of closely stacking and aging the heat-pressed and formed slab in an indoor environment for 7 to 14 days, and the machining treatment includes trimming, sawing, and sanding the cured slab with a machining device to fix the thickness.
16. An outdoor high weather-resistant bamboo composite material produced by the method for producing an outdoor high weather-resistant bamboo composite material according to any one of claims 1 to 15.
17. The outdoor high weather resistant bamboo composite material according to claim 16, wherein the outdoor high weather resistant bamboo composite material has a natural bamboo color, and the outdoor high weather resistant bamboo composite material has a density of 0.9g/cm 3 ～1.3g/cm 3 Static bending strength of the outdoor high weather-resistant bamboo recombinant material>100MPa, the elastic modulus of the outdoor high-weather-resistance bamboo recombinant material is more than or equal to 12GPa, and the mildew resistance of the outdoor high-weather-resistance bamboo recombinant material is 0 grade and the corrosion resistance is I grade.
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