CN114714459A - Outdoor high-weather-resistance bamboo reconstituted material and manufacturing method thereof - Google Patents
Outdoor high-weather-resistance bamboo reconstituted material and manufacturing method thereof Download PDFInfo
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- CN114714459A CN114714459A CN202210360796.6A CN202210360796A CN114714459A CN 114714459 A CN114714459 A CN 114714459A CN 202210360796 A CN202210360796 A CN 202210360796A CN 114714459 A CN114714459 A CN 114714459A
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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
- 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
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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
- B27N3/12—Moulding of mats from fibres
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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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- 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
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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
- B27K2240/00—Purpose of the treatment
- B27K2240/20—Removing fungi, molds or insects
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- 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
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- 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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Abstract
The invention discloses an outdoor high weather-resistant bamboo reconstituted wood and a manufacturing method thereof. The outdoor high-weather-resistance bamboo reconstituted wood prepared by the invention has the advantages of strong weather resistance, high strength, approximate color tone of bamboo and the like, can meet the requirements of outdoor bamboo engineering materials and engineering components in production and manufacture, and can be widely applied to the field of modern bamboo-wood structural building engineering.
Description
Technical Field
The invention belongs to the field of manufacturing of bamboo and wood composite reconstituted bamboo in the wood industry, relates to an outdoor bamboo reconstituted wood and a manufacturing method thereof, and particularly relates to an outdoor high-weather-resistance bamboo reconstituted wood with high strength and high weather resistance and a manufacturing method thereof.
Background
The bamboo has the characteristics of rich resources, short growth cycle, high strength-to-weight ratio and the like, and under the large background that wood resources are increasingly deficient, the reasonable development and utilization of the bamboo resources become an important way for relieving the shortage of the wood resources. Driven by the development idea of replacing wood with bamboo, the bamboo is taken as a raw material and is split into bamboo splits or bamboo bundles, and the bamboo splits or bamboo bundles are subjected to glue application and assembly treatment and then are recombined and pressed into boards with controllable breadth and size under the conditions of high temperature and high pressure.
The bamboo wood is a natural biomass material rich in polysaccharide substances such as starch and the like, is very easy to decay and mildew in the use process, not only influences the apparent quality of the product, but also seriously reduces the service life of the product. Because the permeability of the bamboo wood is poor, and the long-term effect of the weather resistance of the product is difficult to realize by the conventional medicament soaking and brushing type anticorrosion and mildew-proof treatment, the high-temperature steam carbonization method is mostly adopted in the prior art to pretreat the bamboo wood, although the weather resistance of the bamboo quality recombined material can be improved by the method, the product is dark brown, the natural color tone of the bamboo wood which is warm and moist is not available is lost, the processing energy consumption is high, and the mechanical strength of the product can be obviously reduced, so that 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 are finally severely restricted. Therefore, how to obtain the outdoor high-weather-resistance bamboo reconstituted wood which has strong weather resistance and high strength and is close to the natural color of the 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 the bamboo and improving the added value of the bamboo product.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an outdoor high-weather-resistance bamboo reconstituted wood which has strong weather resistance and high strength and is close to the natural color of bamboo and a 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-resistance bamboo restructured material comprises the following steps:
s1, performing high-temperature steam sterilization treatment on the bamboo wood unit at 110-125 ℃, then drying and balancing until the water content is 30-60%, and performing biological pretreatment to obtain a pretreated bamboo wood unit, wherein the biological pretreatment is white rot fungus pretreatment;
s2, performing primary cooking treatment on the pretreated bamboo wood units in water at the temperature of 90-95 ℃, and draining to obtain the bamboo wood units subjected to primary cooking treatment;
s3, performing saturated steam carbonization treatment on the bamboo units subjected to primary cooking treatment at the temperature of 100-140 ℃ and the pressure of 0.1-0.3 MPa to obtain bamboo units subjected to carbonization treatment;
s4, performing secondary cooking treatment on the bamboo wood unit after carbonization at the temperature of 60-80 ℃ to prevent mildew and corrosion, drying and balancing until the water content is less than or equal to 18% to obtain the bamboo wood unit after secondary cooking treatment, wherein the secondary cooking treatment liquid comprises water, isothiazolinone missible oil, boric acid and borax;
and S5, performing gum dipping, drying and balancing treatment on the bamboo wood unit subjected to the secondary cooking treatment, then performing assembly and hot press forming treatment, and performing post-treatment to obtain the outdoor high-weather-resistance bamboo reconstituted wood.
In the above method for producing a highly weather-resistant outdoor bamboo reconstituted lumber, preferably, in step S1, the pretreatment with white rot fungi is: spraying the white rot fungus culture solution on the surfaces of the bamboo units after drying and balancing, spraying the white rot fungus culture solution on the surfaces of the bamboo units according to the inoculation amount of 1-20% for inoculation treatment, and treating the bamboo units after inoculation treatment for 5-20 days in a constant-temperature and constant-humidity environment with the temperature of 18-40 ℃ and the humidity of 45-90% to obtain pretreated bamboo units; the white rot fungi is one or more of Phanerochaete chrysosporium (P.chrysosporium), Lawsonia inermis (E.taxodii) and Coriolus versicolor (T.versicolor).
In the method for manufacturing the outdoor high-weather-resistance bamboo restructuring material, preferably, the preparation process of the white-rot fungus culture solution is as follows: mixing potato glucose culture medium, agar and distilled water at a mass ratio of 1: 50, stirring, adding or not adding supplementary inducer, and sterilizing to obtain white rot fungus culture solution, wherein the supplementary inducer comprises Mn2+One or more of carbohydrates and amino acid aromatics; the white rot fungus 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.
Preferably, the bamboo wood units subjected to the inoculation treatment are horizontally placed on shelves of a constant temperature and humidity room to be subjected to constant temperature and humidity treatment, the interlayer spacing of the shelves is 15-25cm, the distance between the bottommost layer of the shelves and the ground is not less than 20cm, the ventilation treatment frequency of the constant temperature and humidity room is 2-3 times/week, the ventilation treatment time is 20-40 min/week, and the gas flow rate of the ventilation treatment is 0.01m3/min～0.1m3/min。
In the method for producing the outdoor highly weather-resistant bamboo reconstituted wood, it is preferable that in step S3, the oxygen content is maintained at less than 2% during the saturated steam carbonization treatment.
In the method for manufacturing the outdoor high-weather-resistance bamboo reconstituted wood, preferably, in step S4, the secondary cooking treatment liquid contains, by mass, 1% to 4% of boric acid, 1% of borax, 0.5% to 1% of isothiazolinone emulsifiable concentrate, and 94% to 97% of water.
Preferably, in step S1, the bamboo unit includes a bamboo bundle unit or a thin bamboo strip unit, the bamboo bundle unit is obtained by splitting a bamboo tube into bamboo pieces and then untwining the bamboo pieces into bamboo bundles, the thin bamboo strip unit is obtained by splitting a bamboo tube into bamboo strips and then splitting the bamboo strips into thin bamboo strips, and the time of the high-temperature steam sterilization treatment is 15-60 min; and/or in the step S2, the time of the primary cooking treatment is 0.5 to 2 hours; and/or in 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 manufacturing the outdoor high-weather-resistance bamboo reconstituted lumber, preferably, in step S4, the drying equipment is a drying kiln or a mesh belt type dryer, the drying temperature is 50 ℃ to 80 ℃, the equilibrium treatment temperature is 20 ℃ to 30 ℃, and the equilibrium treatment relative humidity is 50% to 70%.
In the method for manufacturing the outdoor high weather resistant bamboo restructuring material, in step S5, the impregnation process preferably includes a normal pressure impregnation process or a pressure impregnation process, and the pressure impregnation process includes: and (3) placing the bamboo wood unit subjected to the secondary cooking treatment in a high-pressure impregnation device for pre-vacuum treatment, keeping the high-pressure impregnation device for 6-15 min, adding a phenolic resin adhesive with the solid content of 20-35% until the bamboo wood unit is completely immersed, impregnating for 5-10 min under the pressure condition of 0.5-1.2 MPa, and then releasing the pressure and draining.
In the manufacturing method of the outdoor high-weather-resistance bamboo reconstituted wood, preferably, the drying temperature is 50-60 ℃, and the drying time is 0.5-3 days; the temperature of the equilibrium treatment is 20-35 ℃, the relative humidity of the equilibrium treatment is 60-75%, and the time of the equilibrium treatment is 7-15 days.
Preferably, the hot press forming is one-time hot press forming, the hot press temperature is 130-155 ℃, the hot press pressure is 4.0-6.0 MPa, and the temperature of the slab core layer is kept for 15-35 min after reaching the set temperature.
Preferably, the post-treatment is maintenance treatment and machining treatment, the maintenance treatment is to closely stack and store the plate blank after the hot press forming in an indoor environment for 7 to 14 days, and the machining treatment comprises the steps of cutting edges, sawing, sanding and thicknessing the plate blank after the maintenance treatment by adopting machining equipment.
As a general technical concept, the invention also provides the outdoor high-weather-resistance bamboo restructuring material prepared by the manufacturing method of the outdoor high-weather-resistance bamboo restructuring material.
Preferably, the outdoor high-weather-resistance bamboo restructured material has a bamboo color tone or a color tone close to the bamboo color tone, and the density of the outdoor high-weather-resistance bamboo restructured material is 0.9g/cm3～1.3g/cm3The static bending strength of the outdoor high-weather-resistance bamboo recombinant material>The outdoor high-weather-resistance bamboo recombinant material has the elastic modulus of more than or equal to 12GPa and the mildew resistance of 0 grade and the corrosion resistance of I grade under the condition of 100 MPa.
In step S1 of the present invention:
the high-temperature steam sterilization treatment is to sterilize the bamboo wood units by adopting high-temperature steam so as to kill other infectious microbes possibly carried by the bamboo bundles and avoid the infection of other strains in the white rot fungus culture process. The water content of the bamboo unit after high-temperature steam sterilization treatment is controlled to be 30-60%, and a better growth condition is provided for parasitic propagation of white rot fungi on the bamboo unit as much as possible.
The biological pretreatment is based on the effect of selectively removing low molecular nutrient substances and lignin in the bamboo on the basis of white rot fungi (also called white rot fungi), can greatly reduce the content of the nutrient substances in the bamboo on the basis of ensuring the basic mechanical strength of the bamboo, effectively increases the porosity of fibers and obviously improves the permeability of the bamboo. The biological pretreatment is preferably white rot fungi with low damage to bamboo bundle mechanical properties, such as Phanerochaete chrysosporium (P.chrysosporium), Brucella purpurea (E.taxodii) and Coriolus versicolor (T.versicolor). The white rot fungus culture solution is composed of a potato glucose culture medium, agar and distilled water, is uniformly stirred and subjected to high-temperature sterilization treatment, and can be taken out to be prepared into a white board or taken as a culture solution and put into an incubator for strain culture.
The interlayer spacing of the layer frame is preferably 15-25cm, so that sufficient ventilation conditions are ensured; the ground clearance of the bottommost layer of the shelf is more than or equal to 20cm, so that the bamboo units are prevented from being infected by ground sundry fungi, and the cultivation and the propagation of white rot fungi are further influenced.
In order to better promote the propagation of fungi and shorten the pretreatment period, the constant temperature and humidity chamber can be aerated preferably every week, and the flow rate of aeration treatment is preferably controlled to be 0.01-0.1 m3The ventilation frequency is 2-3 times per week, and the ventilation time is 20-40 min per time.
In order to stimulate the secretion of lignin degrading enzyme of white rot fungus, promote the removal of lignin from bamboo wood unit by white rot fungus and shorten the pretreatment time of biological method, Mn in proper amount may be added into the culture medium2+A saccharide, an amino acid aromatic compound, and the like.
In step S2, the primary cooking treatment is based on the biological pretreatment, and can effectively remove polysaccharides such as starch from the bamboo units, further reduce the content of nutrients in the bamboo, further improve the permeability of the bamboo units, and facilitate the improvement of the later-stage mildew-proof and corrosion-proof treatment effect.
In step S3, the saturated steam carbonization treatment is a process of performing thermal modification treatment on bamboo bundles by using saturated steam (i.e., saturated steam) at a temperature of 100-140 ℃ as a heat transfer medium, the low-temperature saturated steam carbonization treatment is a process of performing thermal degradation and oxidative degradation reaction on bamboo, is beneficial to further discharging partial contents in bamboo conduits and veins, further improves the penetration and weather resistance of the bamboo on the basis of pretreatment and cooking treatment, obviously reduces the temperature compared with other heat treatment processes, saves energy, avoids the degradation of cellulose at high temperature to weaken the mechanical strength and color change of the cellulose, and enables the bamboo to maintain the color tone.
In step S4, the secondary steaming treatment is based on the improvement of bamboo permeability and the strong weather resistance of the mildew-proof and anti-corrosion treatment liquid, and can further improve the mildew-proof, anti-corrosion, permeation and fixation effects of bamboo, and further improve the outdoor weather resistance of the bamboo recombinant material. The mildew-proof and corrosion-proof treatment liquid (namely, the secondary cooking treatment liquid) can be recycled, and the sewage discharge can be reduced on the basis of effectively saving the production cost.
In step S5 of the present invention, the impregnation treatment may be a pressure impregnation method, or a normal pressure impregnation method may be used according to the performance requirement of the final product, and the expected effect may be achieved as well.
Compared with the prior art, the invention has the advantages that:
(1) the manufacturing method of the outdoor high-weather-resistance bamboo recombinant material has the advantages that the manufactured outdoor high-weather-resistance bamboo recombinant material has high weather resistance (including mildew resistance and corrosion resistance), high strength and maintains the original color of bamboo through a multi-stage progressive coupling processing method of 'white rot fungi pretreatment, primary cooking treatment, saturated steam carbonization treatment and secondary cooking treatment', the mildew resistance and corrosion resistance multi-stage coupling processing effect is realized, the defects of the prior art are overcome, and the bottleneck of the prior art is broken through. The multistep progressive coupling treatment method disclosed by the invention is based on a mode of multi-stage progressive selective removal of the chemical group of the bamboo body, not only is a microbial nutrient source of the bamboo body selectively eliminated, but also the formation of a multistage pore structure of the bamboo body is promoted, the efficient permeation, uniform distribution and long-acting fixation of the mildew-proof preservative and the adhesive in the bamboo are realized, the weather resistance and durability of the bamboo reconstituted material are obviously improved, and the natural color tone and high-strength manufacture of the bamboo are maintained.
The manufacturing method has obvious coupling effect among multiple steps and is a progressive design mode, firstly, low-molecular nutrient substances and a small part of lignin in the bamboo are decomposed through the pretreatment of white rot fungi (step S1), the content of the nutrient substances in the bamboo is greatly reduced, the micro porosity in the cell wall of the bamboo is effectively increased, meanwhile, the cell pore structure is damaged through the growth and extension of hypha, the permeability of the bamboo is improved, the steps not only improve the mildew-proof and corrosion-proof performance and the outdoor weather resistance performance of the bamboo from the angle of reducing the content of the nutrient substances in the bamboo, but also form more micro pores in the cell wall through the degradation effect of the white rot fungi, and open a micro fluid channel between cells; on the basis of biological pretreatment, the subsequent primary cooking treatment (step S2) and the saturated steam carbonization treatment (step S3) promote better dissolution of nutrients in the bamboo and further strengthening of a multilevel void structure in the bamboo, so that moisture and saturated steam are easier to permeate, the nutrients are easier to migrate out, and meanwhile, a mildew-proof and corrosion-resistant treatment agent (secondary cooking treatment liquid) in the secondary cooking treatment stage (step S4) is also promoted to enter the cell cavities and cell walls of the bamboo more easily, and the mildew-proof and corrosion-resistant treatment effect of a later agent is enhanced.
As can be seen from the above, the biological pretreatment of step S1 has an enhancing and coupling effect on the overall effect and the subsequent treatments of the respective steps.
The primary cooking process of step S2 mainly functions as follows: firstly, white rot fungi are killed through high-temperature cooking treatment, and excessive degradation of bamboo lignin by the fungi in the later period is prevented, so that the mechanical strength of the bamboo is remarkably reduced; and secondly, metabolites generated by white rot fungi are dissolved and removed in time, residual low-molecular nutrient substances in the bamboo wood are further dissolved and removed, and micro and macro pores of the bamboo wood are further enriched, so that the permeability of the bamboo wood unit is further improved. Step S2 can further enhance the effect of step S1, and at the same time, the step S2 can further increase the bamboo permeability, and improve the processing effect of the subsequent steps S3 and S4, so step S2 has a coupling effect on both steps S3 and S4.
The saturated steam carbonization treatment in step S3 mainly has the following effects: under the action of saturated water vapor, low molecular compounds and main components in the bamboo materials can be subjected to thermal degradation and oxidative degradation reactions in different degrees, so that partial contents in the bamboo materials are further discharged, microscopic and macroscopic pores in the bamboo materials are further increased, and the permeability, mildew resistance and corrosion resistance of the bamboo materials are further improved. The step S2 can enhance the effect of the step S3, because the pores in the bamboo material are increased by the step S2, and the saturated steam can enter into the interior of the bamboo material and the interior of the cell wall more easily, so that the low molecular compounds and the main components in the bamboo material can be degraded and oxidized to a greater extent. Through the treatment of the step S3, the nutrient substances in the bamboo wood are further reduced, the microscopic and macroscopic pores are further increased, the permeability of the bamboo wood is further improved, and the permeation amount of the mildew-proof and corrosion-resistant treatment agent in the bamboo wood can be increased again when the bamboo wood is treated in the subsequent step S4, so that the whole mildew-proof and corrosion-resistant treatment effect of the bamboo wood 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, a breeding basis can be provided for subsequent biological pretreatment under the water content, and the water content range is properly controlled to be directly related to the biological pretreatment effect. The invention adopts the bamboo wood unit after primary cooking through carbonization treatment of low-temperature saturated steam (the low temperature is relative to the high-temperature saturated steam in the prior art) at 100-140 ℃, and can effectively ensure that the color of the bamboo wood keeps the original color as far as possible.
(3) The outdoor high-weather-resistance bamboo reconstituted wood prepared by the invention has the characteristics of strong weather resistance, high strength, natural color tone of the warm and moist bamboo and the like, and can be widely applied to outdoor structure application. The density of the bamboo recombinant material can reach 0.9 to 1.3g/cm3The mould-proof and corrosion-resistant performance reaches the highest level, namely the mould-proof performance is 0 level, the corrosion-resistant performance is I level, the static bending strength is more than 100MPa, the elastic modulus is more than or equal to 12GPa, the requirements of outdoor bamboo engineering materials and engineering components in production and manufacture can be met, and the bamboo-wood composite material can be widely applied to the field of modern bamboo-wood structural building engineering.
Drawings
Fig. 1 is a process flow chart of a manufacturing method of the outdoor high weather-resistant bamboo restructured material in example 1 of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention. The materials and equipment used in the following examples are commercially available.
Example 1:
the invention relates to a method for manufacturing an outdoor high-weather-resistance bamboo restructuring material, which comprises the following steps as shown in figure 1:
s1 pretreatment by biological method
S1.1, preparing bamboo bundles: sawing fresh moso bamboos into bamboo tubes with the length of 2.15m, splitting the bamboo tubes into bamboo strips with the width of 30mm by a bamboo tube splitting machine, removing green and yellow, and processing the bamboo strips into bamboo bundles by a bamboo chip fluffer to obtain bamboo bundle units which are loose transversely and are penetrated longitudinally.
S1.2, high-temperature steam sterilization treatment: placing the bamboo bundle unit in a high-pressure sterilization kettle at the temperature of 115 ℃, sterilizing for 30min by adopting high-temperature steam, taking out, and immediately transferring to a sterilized constant-temperature constant-humidity room for later use. The high-temperature steam sterilization treatment is to kill other infectious microbes 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 and balancing treatment: drying and balancing the bamboo bundle unit subjected to high-temperature steam sterilization treatment in a constant-temperature and constant-humidity room with the temperature of (20 +/-2) DEG C and the humidity of (50 +/-5)% for 3 days until the water content of the bamboo bundle unit is adjusted to 50% for later use, and providing excellent growth conditions for the subsequent biological pretreatment of the bamboo bundles.
S1.4, preparing white rot fungus liquid: in the embodiment, Phanerochaete chrysosporium (P.chrysosporium) is selected as the white rot fungi to be pretreated by a biological method, after inoculation in a white board of a culture medium, the white board is placed in an incubator, the white rot fungi are taken out every day to observe the growth condition of the white rot fungi, the occurrence of the condition without infectious microbe infection is ensured, the white rot fungi are taken out after the area of bacterial plaque is developed to 70-80% of the area of the white board, the white rot fungi are poured into a stainless steel pulverizer to be pulverized, and then the pulverized white rot fungi and distilled water are mixed and uniformly mixed according to the mass ratio of 1: 60 for standby use, so that the white rot fungi liquid is obtained.
Preparing a white-rot fungus culture solution: mixing potato glucose culture medium, agar and distilled water at a mass ratio of 1: 50, stirring, and adding appropriate amount of Mn2+Mn in the mixture after the addition of inducer2+Controlling the concentration at 10mg/kg, sterilizing in a high temperature sterilizing chamber for 15min, taking out to obtain white rot fungus culture solution, and placing in an incubator for use.
S1.5, pretreatment by a biological method: uniformly spraying the white rot fungus culture solution on the surfaces of the bamboo bundle units subjected to drying and balancing treatment in the step S1.3, uniformly spraying the white rot fungus culture solution on the surfaces of the bamboo bundle units according to the inoculation amount of 10% to carry out inoculation treatment, horizontally stacking the bamboo bundle units subjected to the inoculation treatment on shelves with the interlayer spacing of 25cm and the bottom floor height of 30cm, transferring the shelves to a constant-temperature and constant-humidity room with the temperature of (20 +/-2) DEG C and the humidity of (60 +/-5%) for pretreatment for 10 days to obtain pretreated bamboo bundle units, and carrying out forced ventilation treatment on the constant-temperature and constant-humidity room for 3 times every week in the pretreatment process, wherein the ventilation time duration is 30 min/time, and the ventilation flow rate is 0.1m3/min。
S2, primary cooking treatment: and (3) placing the bamboo bundle unit pretreated by the biological method in a water bath pool, completely immersing the bamboo bundle unit in water, continuously cooking for 1h at the temperature of 95 ℃, taking out the bamboo bundle unit, and draining for later use.
S3, saturated steam carbonization: and (3) under the conditions of 130 ℃ and 0.2MPa saturated steam treatment, carbonizing the bamboo bundle unit subjected to primary cooking treatment for 1h to obtain a carbonized bamboo bundle unit, wherein the oxygen content is always kept lower than 2% in the carbonization treatment process.
S4, secondary cooking treatment: and (2) putting the bamboo bundle unit after carbonization treatment into a water bath, adding a mildew-proof and corrosion-resistant treatment liquid consisting of 3% of boric acid, 1% of borax, 1% of isothiazolinone emulsifiable concentrate and 95% of water in percentage by mass, completely immersing the bamboo bundle unit, performing secondary cooking treatment at the temperature of 70 ℃, taking out the bamboo bundle unit after 2 hours of continuous cooking to obtain the bamboo bundle unit after mildew-proof and corrosion-resistant treatment, forcibly drying the bamboo bundle unit after mildew-proof and corrosion-resistant treatment in a drying kiln at the temperature of 80 ℃ for 20 hours, taking out the bamboo bundle unit, and then putting the bamboo bundle unit in a balance chamber at the temperature of (23 +/-2) DEG C and the relative humidity of (65 +/-5%) for balance treatment until the water content of the bamboo bundle unit is reduced to about 16% to obtain the bamboo bundle unit after secondary cooking treatment.
S5, gum dipping treatment: and (3) placing the bamboo bundle unit subjected to the secondary cooking treatment in a phenolic resin adhesive with the solid content of 25% under the normal temperature condition to be completely immersed, keeping for 20min, taking out and draining until no glue solution drops, and obtaining the bamboo bundle unit subjected to the gum dipping treatment.
S6, drying and balancing: drying the bamboo bundle unit after the gum dipping treatment in a conventional drying kiln at the temperature of 55 ℃ for 2 days, taking out, and then moving to a balance chamber with the ambient temperature of (23 +/-2) ℃ and the relative humidity of (65 +/-5%) for balance treatment for 7 days.
S7, hot press forming of the plate blank: and (3) assembling and placing the dried and balanced bamboo bundle units on a base plate along the fiber direction, after the corresponding weight requirement is met, conveying the obtained plate blank together with the base plate into a hot press through a conveyor belt to perform hot press forming treatment, controlling the temperature of a core layer of the hot-pressed plate blank to be 140 ℃, controlling the hot pressing pressure to be 4.5MPa, controlling the hot pressing time to be 20min after the temperature of the core layer of the plate blank reaches a set temperature, and then cooling and releasing pressure 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 the hot press forming is 4.0-6.0 MPa, and the same or similar technical effect can be obtained when the temperature of the slab core layer reaches the set temperature and then is kept for 15-35 min.
S8, curing and machining: stacking the light-color bamboo reconstituted material plate blank primary product, separating the upper layer forming plate blank and the lower layer forming plate blank by using a partition bar during stacking, and placing the formed plate blanks in a balance warehouse for curing for 7 days; after the maintenance is finished, the formed plate blank after the maintenance treatment is subjected to edge cutting, saw cutting, sanding, thickness setting and other machining treatments by adopting a plate cutting saw, a sliding table saw and the like, and a finished product of the high-weather-resistance light-color bamboo reconstituted wood, namely the outdoor high-weather-resistance bamboo reconstituted wood is obtained.
The outdoor high weather resistant bamboo prepared by the embodimentThe recombined material is bamboo color with performance parameters shown in Table 1, i.e. the density of the outdoor high weather resistance bamboo recombined material is 1.10g/cm3The outdoor high weather-resistant bamboo recombinant material has static bending strength of 150MPa, bending elastic modulus of 12GPa, mildew resistance of 0 grade and corrosion resistance of I grade.
Comparative example 1:
a method for manufacturing a bamboo-based reconstituted bamboo, which is substantially the same as the method for manufacturing the bamboo in example 1, except that: the steps are different in sequence, and the step S4 is firstly carried out, and then the 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 and balancing treatment, plate blank hot-press forming treatment, maintenance and machining treatment.
Comparative example 2:
a method for manufacturing a bamboo-based reconstituted bamboo, which is substantially the same as the method for manufacturing the bamboo in example 1, except that: the steps are different in sequence, step S4 is carried out after step S1, and step S2 is carried out, namely biological pretreatment, secondary cooking treatment (mildew-proof and corrosion-proof treatment), primary cooking treatment, saturated steam carbonization treatment, gum dipping treatment, drying and balancing treatment, slab hot-press forming treatment, maintenance and machining treatment.
Comparative example 3:
a manufacturing method of bamboo recombined bamboo is basically the same as the manufacturing method of the embodiment 1, and the difference is only that: the steps are different in sequence, and after the step S1, the step S3 is firstly carried out, and then the step S2, 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, is carried out.
Example 2:
the invention relates to a method for manufacturing an outdoor high-weather-resistance bamboo restructuring material, which comprises the following steps:
s1 pretreatment by biological method
S1.1, preparing bamboo strips: sawing fresh moso bamboos into bamboo barrels with the length of 1.55m, splitting the bamboo barrels into bamboo strips with the width of 15mm by using a bamboo barrel splitting machine, and then splitting the bamboo strips into thin bamboo strips with the thickness of 1-2 mm along the radial direction by using a bamboo strip splitting machine to obtain the bamboo strip units.
S1.2, high-temperature steam sterilization treatment: and (3) placing the bamboo strip unit in an autoclave with the temperature of 120 ℃, sterilizing for 20min by adopting high-temperature steam, taking out, and immediately transferring to a sterilized constant-temperature constant-humidity room for later use. The high-temperature sterilization treatment is to kill other bacteria carried by the bamboo bundle.
S1.3, drying and balancing treatment: and (3) drying and balancing the bamboo strip unit subjected to high-temperature steam sterilization treatment in a constant-temperature constant-humidity room with the temperature of (25 +/-2) DEG and the humidity of (65 +/-5%) for 2 days until the water content of the bamboo strip unit is adjusted to 40% for later use, and providing excellent growth conditions for subsequent biological pretreatment of the bamboo strip.
S1.4, preparing white rot fungus liquid: according to the embodiment, coriolus versicolor (T.versicolor) is selected as a biological method for pretreating white rot fungi, a fungi inoculation needle is utilized to inoculate the white rot fungi in a culture medium white board, the white board is placed in an incubator, the white rot fungi are taken out every day to observe the growth condition of the white rot fungi, the white rot fungi are taken out after the plaque area is 80% -90% of the white board area, the white rot fungi are poured into a stainless steel pulverizer to be pulverized, and then the pulverized white rot fungi and distilled water are mixed uniformly according to the mass ratio of 1: 60 for standby application, so that white rot fungi liquid is obtained.
Preparing a white-rot fungus culture solution: mixing potato glucose culture medium, agar and distilled water according to the mass ratio of 1: 50, stirring uniformly, adding appropriate amount of veratryl alcohol, controlling the concentration of veratryl alcohol in the mixed solution at 0.50mmol/L, placing the obtained mixture as a supplementary inducer in a high-temperature sterilizing box for sterilizing for 20min, taking out the obtained product to obtain white rot fungus culture solution, and placing the white rot fungus culture solution in an incubator for later use.
S1.5, pretreatment by a biological method: uniformly spraying the white rot fungus culture solution on the surface of the bamboo strip unit after drying and balancing treatment, uniformly spraying the white rot fungus culture solution on the surface of the bamboo strip unit according to the inoculation amount of 20% for inoculation treatment, horizontally stacking the bamboo strip unit after inoculation treatment on a shelf with the interlayer spacing of 20cm and the bottommost layer height of 35cm, and transferring the bamboo strip unit to a constant temperature and humidity room for pretreatment with the temperature of (20 +/-2) DEG C and the relative humidity of (60 +/-5)%For 20 days. In the pretreatment process, the constant temperature and humidity room is subjected to forced ventilation treatment for 2 times per week, the ventilation time is 30 min/time, and the ventilation flow rate is 0.05m3/min。
S2, primary cooking treatment: and (3) placing the bamboo strip unit pretreated by the biological method into a water bath pool, completely immersing the bamboo strip unit in water, continuously cooking the bamboo strip unit for 2 hours at the temperature of 90 ℃, taking out the bamboo strip unit, and draining the bamboo strip unit for later use.
S3, saturated steam carbonization: and (3) carbonizing the bamboo strip unit subjected to primary cooking treatment for 2h under the saturated steam treatment condition that the temperature is 140 ℃ and the pressure is 0.3MPa to obtain a carbonized bamboo strip unit, wherein the oxygen content is always kept lower than 2% in the carbonization treatment process.
S4, secondary cooking treatment: and (3) placing the bamboo strip unit after carbonization treatment in a water bath, adding mildew-proof and corrosion-proof treatment liquid consisting of 1.5% of boric acid, 1% of borax, 0.5% of isothiazolinone emulsifiable concentrate and 97% of water in percentage by mass, completely immersing the bamboo strip unit, performing secondary cooking treatment at the temperature of 80 ℃, and taking out after 3 hours to obtain the bamboo strip unit after mildew-proof and corrosion-proof treatment. And forcibly drying the bamboo strip unit subjected to the mildew-proof and corrosion-proof treatment in a drying kiln at the temperature of 60 ℃ for 30h, taking out the bamboo strip unit, and then placing the bamboo strip unit in a balance chamber at the temperature of (23 +/-2 ℃) and the relative humidity of (65 +/-5%) for balance treatment until the water content of the bamboo strip unit is about 12%.
S5, dipping the bamboo strips: placing the dried and balanced bamboo strip units in a high-pressure impregnation tank for pre-vacuum treatment, keeping for 6min, adding a phenolic resin adhesive with the solid content of 35% to completely immerse the bamboo strip units, then increasing the pressure of the solution in the high-pressure impregnation tank to 1.2MPa, maintaining the pressure for 10min, releasing the pressure, taking out the bamboo strip units, and draining to obtain the impregnated bamboo strip units.
S6, drying and balancing: drying the bamboo strip unit after the gum dipping treatment in a conventional drying kiln at the temperature of 60 ℃ for 1.5 days, taking out, and then moving to a balance chamber with the ambient temperature of (23 +/-2) ℃ and the relative humidity of (65 +/-5%) for carrying out balance treatment for 7 days.
S7, hot press forming of the plate blank: and (3) assembling the dried and balanced bamboo skin units on the base plate according to the fiber direction, placing the assembled bamboo skin units on the base plate, after meeting the corresponding weight requirement, conveying the obtained plate blank together with the base plate into a hot press through a conveyor belt for hot press forming treatment, controlling the temperature of a core layer of the hot-pressed plate blank at 130 ℃, controlling the hot pressing pressure at 4.0MPa, controlling the hot pressing time until the temperature of the core layer of the plate blank reaches a set temperature, keeping for 15min, cooling, releasing pressure, and discharging the plate to obtain a light-color bamboo recombinant plate blank primary product.
S8, curing and machining: stacking the light-color bamboo reconstituted material plate blank primary product, separating the upper layer forming plate blank and the lower layer forming plate blank by using a partition bar during stacking, and placing the formed plate blanks in a balance warehouse for curing for 7 days; after the curing is finished, the cured formed plate blank is subjected to machining treatment such as edge cutting, saw cutting, sanding and thickness setting by adopting a plate cutting saw, a sliding table saw and the like, and the outdoor high-weather-resistance light-color bamboo recombined bamboo is obtained.
The outdoor high-weather-resistance bamboo reconstituted wood prepared by the embodiment is in bamboo color tone, and the performance parameters are shown in table 1, namely the density of the outdoor high-weather-resistance bamboo reconstituted wood is 1.12g/cm3The outdoor high weather-resistant bamboo recombinant material has static bending strength of 155MPa, bending elastic modulus of 14GPa, mildew resistance of 0 grade and corrosion resistance of I grade.
The outdoor high weather resistant bamboo reconstituted lumber obtained in examples 1 to 2 and the bamboo reconstituted bamboo obtained in comparative examples 1 to 3 were tested for their performances, as shown in table 1.
TABLE 1 comparison table of outdoor high weather resistant bamboo reconstituted bamboo materials of examples 1-2 and comparative examples 1-3
Compared with the embodiment 1, the step S4 is firstly carried out, because the bamboo wood is firstly subjected to the mildew-proof and corrosion-proof steaming treatment, a sufficient macro-pore structure and a sufficient micro-pore structure are not formed in the bamboo wood, and the mildew-proof and corrosion-proof treatment agent is difficult to enter the cell cavities and the cell walls of the bamboo wood, so that a good treatment effect cannot be obtained naturally. Compared with the embodiment 1, the step S4 is firstly carried out after the step S1, and then the step S2 and the step S3 are carried out, because before the mildew-proof and corrosion-resistant treatment agent permeates into the bamboo wood, although the bamboo wood is pretreated by a biological method to form a certain degree of pore structure on the surface of the bamboo wood, the porosity inside the bamboo wood is still poor, so that the mildew-proof and corrosion-resistant treatment agent is difficult to enter the cell cavities and the cell walls of the bamboo wood; and a large part of mildew-proof and corrosion-resistant treatment agents attached to the surface of the bamboo wood can be dissolved and decomposed by the cooking treatment and the saturated steam treatment which are carried out at the later stage, so that the treatment effect is seriously influenced. In comparison with example 1, in step S3 and step S2 after step S1, when the low-temperature saturated steam carbonization treatment is performed, the moisture content inside the bamboo material is low and is far from reaching a saturated state, and sufficient high-temperature and high-pressure water cannot be generated inside the bamboo material, so that the soluble substances in the bamboo material are difficult to dissolve and migrate out, and more micro and macro pores are difficult to form, and the treatment effect is finally affected. Therefore, compared with the bamboo restructured bamboo prepared by the comparative examples 1-3 and the restructured bamboo produced by the prior art, the outdoor high-weather-resistance bamboo restructured material provided by the invention has the advantages that the high weather resistance of the bamboo is obviously improved, the excellent mechanical property and the excellent color tone of the bamboo can be maintained, and the requirements of the current market on the outdoor light-color bamboo structural building engineering materials can be met.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many variations and modifications to the disclosed embodiments, or equivalent variations, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (10)
1. A manufacturing method of an outdoor high-weather-resistance bamboo restructured material is characterized by comprising the following steps:
s1, performing high-temperature steam sterilization treatment on the bamboo wood unit at 110-125 ℃, then drying and balancing until the water content is 30-60%, and performing biological pretreatment to obtain a pretreated bamboo wood unit, wherein the biological pretreatment is white rot fungus pretreatment;
s2, performing primary cooking treatment on the pretreated bamboo wood units in water at the temperature of 90-95 ℃, and draining to obtain the bamboo wood units subjected to primary cooking treatment;
s3, performing saturated steam carbonization treatment on the bamboo units subjected to primary cooking treatment at the temperature of 100-140 ℃ and the pressure of 0.1-0.3 MPa to obtain bamboo units subjected to carbonization treatment;
s4, performing secondary cooking treatment on the bamboo unit subjected to carbonization treatment at the temperature of 60-80 ℃ to prevent mildew and corrosion, and drying and balancing the bamboo unit until the water content is less than or equal to 18% to obtain the bamboo unit subjected to secondary cooking treatment, wherein the secondary cooking treatment liquid comprises water, isothiazolinone missible oil, boric acid and borax;
and S5, performing gum dipping, drying and balancing treatment on the bamboo wood unit subjected to the secondary cooking treatment, then performing assembly and hot press forming treatment, and performing post-treatment to obtain the outdoor high-weather-resistance bamboo reconstituted wood.
2. The method for manufacturing outdoor high weather resistant bamboo reconstituted material according to claim 1, wherein in step S1, the white rot fungus pretreatment is: spraying the white rot fungus culture solution on the surfaces of the bamboo units after drying and balancing, spraying the white rot fungus culture solution on the surfaces of the bamboo units according to the inoculation amount of 1-20% for inoculation treatment, and treating the bamboo units after inoculation treatment for 5-20 days in a constant-temperature and constant-humidity environment with the temperature of 18-40 ℃ and the humidity of 45-90% to obtain pretreated bamboo units; the white rot fungi is one or more of Phanerochaete chrysosporium (P.chrysosporium), Lawsonia inermis (E.taxodii) and Coriolus versicolor (T.versicolor).
3. The method for manufacturing outdoor high weather resistant bamboo reconstituted wood according to claim 2, wherein the white rot fungus culture solution is prepared by the following steps: mixing potato glucose culture medium, agar and distilled water at a mass ratio of 1: 50, stirring, adding or not adding supplementary inducer, and sterilizing to obtain white rot fungus culture solution, wherein the supplementary inducer comprises Mn2+One or more of carbohydrates and amino acid aromatics; the white rot fungus 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;
and/or horizontally placing the bamboo wood units subjected to the inoculation treatment on a shelf of a constant temperature and humidity room for constant temperature and humidity treatment, wherein the interlayer distance of the shelf is 15-25cm, the distance between the bottommost layer of the shelf and the ground is not less than 20cm, the ventilation treatment frequency of the constant temperature and humidity room is 2-3 times/week, the ventilation treatment time is 20-40 min/week, and the flow rate of the gas subjected to ventilation treatment is 0.01m3/min～0.1m3/min。
4. The method for producing a highly weather-resistant bamboo reconstituted 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.
5. The method for manufacturing outdoor high weather resistant bamboo reconstituted wood according to claim 1, wherein in step S4, the secondary cooking treatment liquid contains, by mass, 1% to 4% of boric acid, 1% of borax, 0.5% to 1% of isothiazolinone emulsifiable concentrate, and 94% to 97% of water.
6. The method for manufacturing outdoor high weather resistant bamboo reconstituted lumber according to claim 1, wherein in step S1, the bamboo units include bamboo bundle units obtained by splitting a bamboo tube into bamboo pieces and then untwining the bamboo pieces into bamboo bundles or bamboo splits units obtained by splitting a bamboo tube into bamboo strips and then splitting the bamboo strips into bamboo splits, and the time of the high temperature steam sterilization treatment is 15 to 60 min; and/or in step S2, the time of the primary cooking treatment is 0.5 h-2 h; and/or in 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.
7. The method for manufacturing the outdoor high weather-resistant bamboo reconstituted material according to any one of claims 1 to 6, wherein in step S4, the equipment used for drying is a drying kiln or a mesh belt dryer, the temperature for drying is 50 ℃ to 80 ℃, the temperature for equilibrium treatment is 20 ℃ to 30 ℃, and the relative humidity for equilibrium treatment is 50% to 70%.
8. The method for manufacturing the outdoor high weather-resistant bamboo reconstituted material according to any one of claims 1 to 6, wherein in step S5, the impregnation is performed by an atmospheric pressure impregnation method or a pressure impregnation method, and the pressure impregnation method comprises: placing the bamboo wood unit subjected to the secondary cooking treatment in high-pressure impregnation equipment for pre-vacuum treatment, keeping the high-pressure impregnation equipment for 6-15 min, adding a phenolic resin adhesive with the solid content of 20-35% until the bamboo wood unit is completely immersed, impregnating for 5-10 min under the pressure condition of 0.5-1.2 MPa, and then releasing the pressure and draining;
and/or the drying temperature is 50-60 ℃, and the drying time is 0.5-3 days; the temperature of the equilibrium treatment is 20-35 ℃, the relative humidity of the equilibrium treatment is 60-75%, and the time of the equilibrium treatment is 7-15 days;
and/or, the hot press forming is one-time hot press forming, the hot press temperature is 130-155 ℃, the hot press pressure is 4.0-6.0 MPa, and the temperature of the slab core layer is kept for 15-35 min after reaching the set temperature;
and/or the post-treatment is maintenance treatment and machining treatment, the maintenance treatment is to closely stack and store the plate blank subjected to the hot press forming in an indoor environment for 7-14 days, and the machining treatment comprises the steps of cutting edges, sawing and sanding for thickness setting treatment of the plate blank subjected to the maintenance treatment by adopting machining equipment.
9. An outdoor high weather-resistant bamboo restructured material produced by the method for producing an outdoor high weather-resistant bamboo restructured material according to any one of claims 1 to 8.
10. The outdoor high weather-resistant bamboo-based reconstituted wood according to claim 9, wherein the outdoor high weather-resistant bamboo-based reconstituted wood has a bamboo color tone or a color tone close to the bamboo color tone, and the density of the outdoor high weather-resistant bamboo-based reconstituted wood is 0.9g/cm3～1.3g/cm3The static bending strength of the outdoor high-weather-resistance bamboo recombinant material>The outdoor high-weather-resistance bamboo recombinant material has the elastic modulus of more than or equal to 12GPa and the mildew resistance of 0 grade and the corrosion resistance of I grade under the condition of 100 MPa.
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| WO2023193740A1 (en) * | 2022-04-07 | 2023-10-12 | 湖南桃花江竹材科技股份有限公司 | Outdoor high-weather-resistance bamboo scrimber, and manufacturing method therefor |
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| CN117445446A (en) * | 2023-10-23 | 2024-01-26 | 嘉兴中集新材料科技发展有限公司 | Preparation method of composite material, composite board and low-temperature storage tank |
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