WO2023193740A1 - Outdoor high-weather-resistance bamboo scrimber, and manufacturing method therefor - Google Patents

Abstract

Disclosed in the present invention are an outdoor high-weather-resistance bamboo scrimber, and a manufacturing method therefor. The manufacturing method comprises sequentially subjecting a bamboo wood unit to a high-temperature steam sterilization treatment, a biological pretreatment, a primary cooking treatment, a saturated steam carbonizing treatment and a secondary cooking treatment to obtain a mildew-proof and rot-proof bamboo wood unit; and then subjecting same to a gum dipping treatment, a drying and balancing treatment, assembling, hot-pressing forming and post-treatment to obtain an outdoor high-weather-resistance bamboo scrimber. The outdoor high-weather-resistance bamboo scrimber prepared in the present invention has the advantages of high weather resistance, a high strength, being close to the original color of bamboo wood, etc., can satisfy the requirements for producing and manufacturing outdoor bamboo engineering materials and engineering members, and can be widely used in the field of modern bamboo wood structure building engineering.

Description

A highly weather-resistant bamboo restructured material for outdoor use and its manufacturing method

Cross-references to related applications

This application is based on the Chinese patent application with the filing date "April 07, 2022", the application number "2022103607966", and the invention title "A highly weather-resistant bamboo recombinant material for outdoor use and its manufacturing method", and Claiming its priority, the full text of this Chinese patent application is hereby incorporated into this application as a part of this application.

【Technical field】

The invention belongs to the field of manufacturing bamboo-wood composite recombinant bamboo materials in the wood industry, and relates to a bamboo recombinant material for outdoor use and a manufacturing method thereof. In particular, it relates to a highly weather-resistant bamboo recombinant material for outdoor use with high strength and weather resistance and its manufacture. method.

【Background technique】

Bamboo has the characteristics of rich resources, short growth cycle, and high strength-to-weight ratio. Against the background of increasingly scarce timber resources, rational development and utilization of bamboo resources has become an important way to alleviate the shortage of timber resources. Driven by the development concept of "replacing wood with bamboo", bamboo is used as raw material, which is divided into bamboo strips or decomposed into bamboo bundles. After sizing and assembly, it is reorganized and pressed under high temperature and high pressure conditions into a format that can be Controlled boards not only have superior mechanical properties similar to those of wood, but also overcome the shortcomings of bamboo's thin-walled, hollow and sharp sharpness. It breaks through the application of bamboo in structural engineering fields such as construction and transportation, and greatly promotes the modernization of bamboo. The process of industrialization and large-scale utilization.

Bamboo is a natural biomass material rich in starch and other polysaccharides. It is prone to decay and mildew during use, which not only affects the apparent quality of the product, but also seriously reduces the service life of the product. Due to the poor permeability of bamboo itself, it is difficult to achieve long-term weather resistance of products using conventional chemical immersion and brushing anti-corrosion and anti-mildew treatments. Therefore, the existing technology mostly uses high-temperature steam carbonization method to pretreat bamboo. Although this method It can improve the weather resistance of bamboo recombinant wood, but the product is dark brown and loses the warm and pleasant natural tone of bamboo. The processing energy consumption is high, and the mechanical strength of the product will also be significantly reduced, resulting in its use in many applications with high strength requirements. The limited field application ultimately severely restricts the further expansion of product application fields and the improvement of market competitiveness. Therefore, how to obtain a highly weather-resistant bamboo recombinant material for outdoor use that has strong weather resistance, high strength and is close to the true color of bamboo and its preparation method so that it can meet the processing and manufacturing requirements of outdoor bamboo engineering materials and engineering components. It is of great significance to expand the application fields of bamboo and improve the added value of bamboo products.

[Content of the invention]

The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a highly weather-resistant bamboo recombinant material for outdoor use that has strong weather resistance, high strength and is close to the natural color of bamboo and its manufacturing method.

In order to solve the above technical problems, the present invention adopts the following technical solutions.

A method for manufacturing highly weather-resistant bamboo restructured materials for outdoor use, including the following steps:

S1. The bamboo unit is subjected to high-temperature steam sterilization at 110°C to 125°C, then dried and balanced to a moisture content of 30% to 60%, and then biologically pretreated to obtain a pretreated bamboo unit, wherein The above-mentioned biological pretreatment is white rot fungus pretreatment;

S2. Perform a steaming treatment on the pretreated bamboo unit in water at 90°C to 95°C, and then drain the bamboo unit to obtain a bamboo unit after the steaming treatment;

S3. Carry out saturated steam carbonization treatment on the bamboo unit after primary cooking at a temperature of 100°C to 140°C and a pressure of 0.1MPa to 0.3MPa to obtain a carbonized bamboo unit;

S4. The carbonized bamboo unit is subjected to a secondary cooking process at a temperature of 60°C to 80°C to prevent mildew and corrosion, and is dried and balanced until the moisture content is ≤18% to obtain a twice-cooked bamboo unit. Among them, the secondary cooking liquid contains water, isothiazolinone emulsifiable concentrate, boric acid and borax;

S5. Dip, dry and balance the twice-cooked bamboo units, then perform blank assembly, hot press forming, and post-processing to obtain highly weather-resistant bamboo restructured timber for outdoor use.

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, in step S1, the white rot fungus pretreatment is: spray the white rot fungus culture liquid onto the surface of the dried and balanced bamboo unit, and then press 1 Spray white rot fungus liquid on the surface of the bamboo unit with an inoculation amount of % to 20% for inoculation treatment. The inoculated bamboo unit is kept at a constant temperature and humidity of 18°C to 40°C and a humidity of 45% to 90%. Treat in the environment for 5 to 20 days to obtain the pre-treated bamboo unit; the white rot fungi are P. chrysosporium, E. taxodii and Lepidoptera One or more species of bacteria (T. versicolor).

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, the preparation process of the white rot fungus culture solution is as follows: mix potato glucose culture medium, agar and distilled water in a mass ratio of 1:1:50 and stir evenly , adding or not adding a supplementary inducer, and after sterilization, a white rot fungus culture liquid is obtained, wherein the supplementary inducer includes one or more of Mn ²⁺ , carbohydrate substances and amino acid aromatic compounds; The white rot fungus liquid is mixed with white rot fungi and water, and the mass ratio of white rot fungi and water is 1:10-100.

In the above-mentioned manufacturing method of highly weather-resistant bamboo restructured timber for outdoor use, preferably, the inoculated bamboo unit is placed horizontally on a shelf in a constant temperature and humidity room for constant temperature and humidity treatment, and the layer spacing of the shelf is 15cm～25cm, the bottom layer of the shelf is ≥20cm from the ground, the ventilation treatment frequency of the constant temperature and humidity room is 2 times/week to 3 times/week, the ventilation treatment time is 20min/time～40min/time, the ventilation treatment The gas flow rate is 0.01m ³ /min～0.1m ³ /min.

In the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, in step S3, the oxygen content is kept <2% during the saturated steam carbonization process.

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, in step S4, the mass fraction of boric acid in the secondary cooking liquid is 1% to 4%, borax is 1%, and isothiazoline is Ketone EC is 0.5% to 1%, water is 94%～97%.

In the above-mentioned manufacturing method of highly weather-resistant bamboo restructured timber for outdoor use, preferably, in step S1, the bamboo unit includes a bamboo bundle unit or a bamboo strip unit, and the bamboo bundle unit is split into bamboo pieces from a bamboo tube and then decomposed into bamboo. Obtained from bundles, the bamboo strip unit is made by splitting the bamboo tube into bamboo strips and then splitting into bamboo strips. The time of the high-temperature steam sterilization treatment is 15min to 60min; and/or, in step S2, the once The cooking time is 0.5h-2h; and/or, in step S3, the saturated steam carbonization time is 1h-2h; and/or, in step S4, the secondary cooking time is 0.5h. ~3h.

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, in step S4, the equipment used for drying is a drying kiln or a mesh belt dryer, and the drying temperature is 50°C to 80°C, so The temperature of the balancing treatment is 20°C to 30°C, and the relative humidity of the balancing treatment is 50% to 70%.

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, in step S5, the impregnation adopts normal pressure impregnation method or pressure impregnation method. The process of the pressure impregnation method is: secondary cooking The treated bamboo unit is placed in a high-pressure impregnation equipment for pre-vacuum treatment, maintained for 6min to 15min, and phenolic resin adhesive with a solid content of 20% to 35% is added until the bamboo unit is completely immersed, under a pressure condition of 0.5MPa to 1.2MPa Soak for 5 to 10 minutes, then release the pressure and drain.

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, the drying temperature is 50°C to 60°C, the drying time is 0.5 days to 3 days, and the balancing treatment temperature is 20°C. ~35°C, the relative humidity of the equilibrium treatment is 60% to 75%, and the time of the equilibrium treatment is 7 days to 15 days.

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use, preferably, the hot-pressing forming is one-time hot-pressing forming, the hot-pressing temperature is 130°C to 155°C, and the hot-pressing pressure is 4.0MPa to 6.0MPa. When the board After the core layer temperature reaches the set temperature, it is maintained for 15 to 35 minutes.

For the above-mentioned manufacturing method of highly weather-resistant bamboo recombinant materials for outdoor use, preferably, the post-processing is curing treatment and machining treatment, and the curing treatment is to place the hot-pressed slabs in close piles in an indoor environment for 7 days to 14 days, and the machining treatment includes using mechanical processing equipment to trim, saw, and sand to determine the thickness of the cured slab.

As a general technical concept, the present invention also provides a high weather-resistant bamboo recombinant wood for outdoor use produced by the above-mentioned manufacturing method of high weather-resistant bamboo recombinant wood for outdoor use.

The above-mentioned high weather-resistant bamboo recombinant wood for outdoor use, preferably, the high weather-resistant bamboo recombinant wood for outdoor use has the natural color of bamboo or is close to the natural color of bamboo, and the density of the high weather-resistant bamboo recombinant wood for outdoor use is 0.9g/ cm ³ ~ 1.3g/cm ³ , the static bending strength of the high weather-resistant bamboo recombinant material for outdoor use is >100MPa, the elastic modulus of the high weather-resistant bamboo recombinant material for outdoor use is ≥12GPa, and the high weather-resistant bamboo recombinant material for outdoor use The mildew resistance of high-quality restructured materials is level 0 and the corrosion resistance is level I.

In step S1 of the present invention:

The high-temperature steam sterilization treatment uses high-temperature steam to sterilize the bamboo unit to kill other miscellaneous bacteria that may be carried by the bamboo bundle itself and avoid infection by other bacterial species during the cultivation process of white rot fungi. The moisture content of bamboo units after high-temperature steam sterilization should be controlled at 30% to 60%, so as to provide optimal growth conditions for the parasitic reproduction of white rot fungi on bamboo units.

The biological method pretreatment is based on the effect of white rot fungi (also known as white rot fungi) to selectively partially remove low-molecular nutrients and lignin in bamboo, which can ensure the basic mechanical strength of bamboo. , greatly reducing the nutrient content in bamboo, while effectively increasing fiber porosity and significantly improving the permeability of bamboo. The preferred biological method for pretreatment is P. chrysosporium, E. taxodii, and T. versicolor, which have low damage to the mechanical properties of bamboo bundles. strains. The white rot fungus culture liquid is a culture liquid used for cultivating white rot fungi. It is composed of three substances: potato dextrose culture medium, agar and distilled water. After being stirred evenly and subjected to high temperature sterilization, it can be taken out to make a white plate or as a culture medium. liquid and put it into an incubator for bacterial culture.

The layer spacing of the shelf is preferably 15-25cm to ensure sufficient ventilation conditions; the distance between the lowest layer of the shelf and the ground is ≥ 20cm to prevent ground bacteria from infecting the bamboo unit and thereby affecting the cultivation of white rot fungi. and reproduction.

In order to better promote fungal reproduction and shorten the pretreatment cycle, it is preferable to ventilate the constant temperature and humidity room every week, and preferably control the flow rate of the ventilation treatment to 0.01~ ^0.1m3 /min, and the ventilation frequency to 2~3 times/ Weekly, the ventilation time is 20~40min/time.

In order to stimulate the secretion of lignin-degrading enzymes of white-rot fungi, better promote the removal of lignin from bamboo units by white-rot fungi, and further shorten the biological pretreatment time, an appropriate amount of Mn ²⁺ and sugar substances can be added to the culture medium. , amino acids, aromatic compounds and other supplement inducers.

In step S2 of the present invention, the primary cooking treatment is based on biological pretreatment, which can more effectively remove polysaccharides such as starch on the bamboo unit, further reduce the nutrient content in the bamboo, and Further improving the permeability of bamboo units will help improve the effect of anti-mold and anti-corrosion treatment in the later stage.

In step S3 of the present invention, the saturated steam carbonization treatment is a process of thermally modifying bamboo bundles using saturated steam (i.e. saturated water vapor) with a temperature of 100-140°C as a heat transfer medium. Low-temperature saturated steam carbonization The treatment is to cause thermal degradation and oxidative degradation of bamboo, which helps to further discharge some of the contents in the bamboo pipes and pores. On the basis of pretreatment and cooking treatment, it further improves the penetration and weather resistance of bamboo. Compared with other heat treatments The temperature of the process is significantly lowered, which not only saves energy, but also avoids the degradation of cellulose at high temperatures, which would weaken its mechanical strength and discoloration, allowing the bamboo to maintain its original color.

In step S4 of the present invention, the secondary cooking treatment is based on the improvement of the permeability of bamboo and the strong weather resistance of the anti-mold and anti-corrosion treatment liquid, which can further improve the anti-mold and anti-corrosion penetration and fixation effect of bamboo, and further improve the outdoor use of bamboo recombined materials. Weather resistance. The anti-mold and anti-corrosion treatment liquid (i.e. the secondary cooking treatment liquid) can be recycled, which can effectively save production costs. On the basis of cost, reduce sewage discharge.

In step S5 of the present invention, the pressure impregnation method can be used for the impregnation treatment. According to the performance requirements of the final product, the normal pressure impregnation method can also be used for the glue impregnation treatment, which can also achieve the desired effect.

Compared with the prior art, the advantages of the present invention are:

(1) The manufacturing method of the high weather-resistant bamboo restructured timber for outdoor use of the present invention adopts a multi-stage progressive coupling treatment method of "white rot fungus pretreatment + primary cooking treatment + saturated steam carbonization treatment + secondary cooking treatment". The produced highly weather-resistant bamboo recombinant wood for outdoor use has the characteristics of high weather resistance (including mildew resistance and anti-corrosion), high strength, and maintains the natural color of bamboo. It realizes the multi-stage coupling treatment effect of mildew and anti-corrosion, and overcomes the shortcomings of the existing technology. , breaking through the bottleneck of existing technology. The multi-step progressive coupling treatment method of the present invention is based on the multi-stage progressive selective removal of the chemical group of the bamboo itself. It not only selectively eliminates the microbial nutrient sources of the bamboo itself, but also promotes the multi-level pore structure of the bamboo itself. The formation of anti-fungal preservatives and adhesives achieves efficient penetration, uniform distribution and long-term fixation in bamboo. It significantly improves the weather resistance and durability of bamboo recombinant materials while maintaining the original color and high quality of bamboo. Made for strength.

The manufacturing method of the present invention has obvious coupling effects among the multiple steps and is designed in an advanced manner. First, the low-molecular nutrients and a small amount of lignin in the bamboo are decomposed through white rot fungus pretreatment (step S1). Reduce the nutrient content in bamboo and effectively increase the microscopic porosity in the bamboo cell wall. At the same time, through the growth and extension of mycelium, it destroys the cell pit structure and improves the permeability of bamboo. This step not only reduces the nutrients in bamboo From the perspective of material content, it improves the anti-mildew, anti-corrosion and outdoor weather resistance of bamboo. It also forms more microscopic pores in the cell wall through the degradation of white rot fungi, and opens up the microscopic fluid channels between cells; subsequent cooking treatment (Step S2) + Saturated steam carbonization treatment (Step S3), based on biological pretreatment, promotes better dissolution of nutrients inside the bamboo and further strengthens the multi-level void structure inside the bamboo. At this time, the moisture and saturated steam are It is easier to penetrate and nutrients can migrate out more easily. It also promotes the anti-fungal and antiseptic treatment agent (secondary cooking treatment liquid) in the secondary cooking stage (step S4) to enter the bamboo cell cavity and cell wall more easily, enhancing the later stage agents. Anti-mildew and anti-corrosion treatment effect.

From the above content, it can be seen that the biological pretreatment in step S1 has an enhancement and coupling effect on the overall effect and subsequent processing steps.

The functions of the one-time cooking treatment in step S2 are mainly reflected in: first, through high-temperature cooking treatment, killing white rot fungi and preventing excessive degradation of bamboo lignin by fungi in the later stage, resulting in a significant reduction in the mechanical strength of bamboo; second, timely dissolution, It removes the metabolites produced by white rot fungi, further dissolves and removes the remaining low-molecular nutrients in the bamboo, and further enriches the micro and macro pores of the bamboo, thus further improving the permeability of the bamboo unit. Step S2 can further enhance the effect of step S1. At the same time, step S2 can further improve the permeability of bamboo and improve the processing effect of subsequent steps S3 and S4. Therefore, step S2 has a coupling effect on both step S3 and step S4.

The effect of the saturated steam carbonization treatment in step S3 is mainly reflected in: under the action of saturated water vapor, the low carbon content in the bamboo material The sub-compounds and main components will undergo thermal degradation and oxidative degradation reactions to varying degrees, which further discharges some of the contents inside the bamboo, further increases the micro and macro pores in the bamboo, and further improves the bamboo's permeability and anti-fungal and anti-corrosion properties. Step S2 can enhance the treatment effect of step S3, because through the treatment of step S2, the pores in the bamboo material increase, and the saturated steam can more easily enter the interior of the bamboo material and the cell wall, which can thermally and oxidatively degrade the bamboo material to a greater extent. low molecular compounds and main components. Through the treatment in step S3, the nutrients in the bamboo are further reduced, the micro and macro pores are further increased, and the permeability of the bamboo is further improved, which can once again increase the penetration amount of the anti-fungal and anti-corrosion treatment agent inside the bamboo during the subsequent step S4, thereby improving the bamboo. The overall anti-mold and anti-corrosion treatment effect, so step S3 has a coupling effect on the subsequent step S4.

(2) In the present invention, after high-temperature steam sterilization, the moisture content is controlled at 30% to 60% through drying balance. This moisture content can provide a breeding basis for subsequent biological pretreatment. Whether the moisture content range is properly controlled or not Directly related to the effect of biological pretreatment. The present invention uses low-temperature saturated steam of 100°C to 140°C (low temperature is relative to high-temperature saturated steam in the prior art) to carbonize the bamboo unit after cooking once, which can effectively ensure that the color of the bamboo remains as original as possible.

(3) The highly weather-resistant bamboo recombinant wood for outdoor use produced by the present invention has the characteristics of strong weather resistance, high strength, and a warm and pleasant bamboo natural color, and can be widely used for outdoor structural purposes. The density of bamboo recombinant wood can reach 0.9~1.3g/ ^cm3 , and the anti-mildew and corrosion resistance reaches the highest level, that is, the anti-mildew performance is level 0, the corrosion resistance is level I, the static bending strength is greater than 100MPa, and the elastic modulus is ≥12GPa. It meets the requirements for the production and manufacturing of outdoor bamboo engineering materials and engineering components, and can be widely used in the field of modern bamboo-wood structure construction engineering.

[Picture description]

Figure 1 is a process flow chart of the manufacturing method of highly weather-resistant bamboo recombinant materials for outdoor use in Embodiment 1 of the present invention.

【Detailed ways】

The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments of the specification, but the protection scope of the present invention will not be limited thereby. The materials and instruments used in the following examples are all commercially available. The white rot fungi in the present invention, namely, P. chrysosporium, E. taxodii and T. versicolor, are from common commercial sources.

Example 1:

A method of manufacturing the highly weather-resistant bamboo recombinant wood for outdoor use of the present invention, as shown in Figure 1, includes the following steps:

S1. Biological pretreatment

S1.1. Preparation of bamboo bundles: Saw fresh moso bamboo into bamboo tubes with a length of 2.15m, use a bamboo tube splitting machine to split them into bamboo strips with a width of 30mm, remove the green and yellow, and then use the bamboo chip deconsolidation machine Process the bamboo strips into bamboo bundles to obtain horizontally loose and vertically connected bamboo bundle units.

S1.2. High-temperature steam sterilization: Place the bamboo bundle unit in an autoclave with a temperature of 115°C, sterilize it with high-temperature steam for 30 minutes, take it out, and immediately transfer it to a sterilized constant temperature and humidity room for waiting. use. The purpose of high-temperature steam sterilization is to kill other miscellaneous bacteria carried by the bamboo bundles themselves, thereby avoiding the possibility of infection by other bacterial species during the subsequent white rot culture process.

S1.3. Drying and balancing treatment: Dry and balance the bamboo bundle units after high-temperature steam sterilization in a constant temperature and humidity room with a temperature of (20±2)°C and a humidity of (50±5)% for 3 days. Until the moisture content of the bamboo bundle unit is adjusted to 50%, it is ready for use to provide better growth conditions for subsequent biological pretreatment of bamboo bundles.

S1.4. Preparation of white rot fungus liquid: In this example, P. chrysosporium is used as the biological method to pretreat the white rot fungus. After inoculating the white rot fungus in the medium white plate, the white plate is placed in the incubator. , take it out every day to observe the growth of white rot fungi to ensure that no bacterial infection occurs. Take it out after the plaque area has grown to 70% to 80% of the area of the white plate, pour it into a stainless steel grinder and crush it, and then crush the white rot fungus. Mix it with distilled water at a mass ratio of 1:60 and prepare it uniformly for use to obtain a white rot fungal liquid.

Preparation of white rot fungus culture solution: Mix potato glucose culture medium, agar and distilled water in a mass ratio of 1:1:50 and stir evenly. After adding an appropriate amount of Mn ²⁺ as a supplementary inducer, the Mn ²⁺ concentration in the mixed solution is controlled. At 10mg/kg, place it in a high-temperature sterilization box for sterilization for 15 minutes and then take it out to obtain the white rot fungus culture liquid, which is placed in the incubator for later use.

S1.5. Biological pretreatment: First, spray the above-mentioned white rot fungus culture solution evenly onto the surface of the bamboo bundle unit after drying and balancing treatment in step S1.3, and then apply 10% of the inoculation amount on the surface of the bamboo bundle unit. Spray the white rot fungus liquid evenly for inoculation treatment. Place the inoculated bamboo bundle units horizontally on a shelf with a layer spacing of 25cm and a bottom layer height of 30cm from the ground, and then move it to a temperature of (20±2) ℃ and a humidity of (60±5)% for 10 days in a constant temperature and humidity room to obtain the pretreated bamboo bundle unit. During the pretreatment process, the constant temperature and humidity room was subjected to mandatory ventilation three times a week. The ventilation duration is 30min/time, and the ventilation flow rate is 0.1m ³ /min.

S2. One-time cooking treatment: Place the bamboo bundle units pretreated by biological methods in a water bath and completely submerge them in water, continue cooking for 1 hour at a temperature of 95°C, take them out, and drain them for use.

S3. Saturated steam carbonization treatment: Under the saturated steam treatment conditions of a temperature of 130°C and a pressure of 0.2MPa, carbonize the above-mentioned bamboo bundle units after one-time cooking for 1 hour to obtain the carbonized bamboo bundle units. During the carbonization process, the oxygen content should always be kept below 2%.

S4. Secondary cooking treatment: Place the above-mentioned carbonized bamboo bundle units in a water bath, and add a waterproofing agent composed of 3% boric acid, 1% borax, 1% isothiazolinone emulsifiable concentrate and 95% water in mass fraction. After the mildew antiseptic treatment liquid is completely immersed in the bamboo bundle unit, perform a secondary cooking process at a temperature of 70°C for 2 hours and then take it out to obtain the mildew and antiseptic treated bamboo bundle unit. The unit is taken out after forced drying in a drying kiln with a temperature of 80°C for 20 hours. Then place it in a balancing chamber with a temperature of (23±2)°C and a relative humidity of (65±5)% for balancing treatment until the moisture content of the bamboo bundle unit is reduced to about 16%, and the result is obtained after secondary cooking of bamboo bundle units.

S5. Glue dipping treatment: Completely immerse the bamboo bundle units after the above-mentioned secondary cooking treatment in a phenolic resin adhesive with a solid content of 25% under normal temperature conditions. Keep it for 20 minutes and then take it out and drain until there are no glue drops. Fall, and obtain the bamboo bundle unit after dipping process.

S6. Drying balance treatment: Dry the dipped bamboo bundle units in a conventional drying kiln at a temperature of 55°C for 2 days, take them out, and then move them to an environment with an ambient temperature of (23±2)°C and a relative humidity of (65±5 )% in an equilibrium chamber for 7 days.

S7. Slab hot press forming treatment: The bamboo bundle units that have been dried and balanced are assembled and placed on the pad along the fiber direction. After reaching the corresponding weight requirements, the resulting slab is sent in together with the pad through the conveyor belt. Hot press forming is performed in a hot press. The temperature of the core layer of the hot-pressed slab is controlled at 140°C, the hot-pressing pressure is controlled at 4.5MPa, and the hot-pressing time is controlled until the temperature of the core layer of the slab reaches the set temperature and then is maintained for 20 minutes. After cooling and pressure relief, the slab is taken out, and the first product of the light-colored bamboo recombinant lumber slab is obtained.

In other embodiments, the slab core layer temperature is 130°C to 155°C, the hot press forming pressure is 4.0MPa to 6.0MPa, and when the slab core layer temperature reaches the set temperature, it is maintained for 15min to 35min, and the same results can be achieved. or similar technical effects.

S8. Maintenance and machining: Stack the above-mentioned initial light-colored bamboo recombinant lumber slabs. During stacking, the upper and lower forming slabs are separated by spacers and placed in a balance warehouse for curing 7 days; after the curing is completed, panel saws, sliding table saws, etc. are used to trim, saw, sand and thickness determine the cured formed slabs to obtain high weather-resistant light-colored bamboo restructured timber products, namely Highly weather-resistant bamboo restructured timber for exterior use.

The high weather-resistant bamboo recombinant wood for outdoor use prepared in this embodiment has the natural color of bamboo. The performance parameters are shown in Table 1, that is, the density of the high weather-resistant bamboo recombinant wood for outdoor use is 1.10g/cm ³ . The static bending strength of the recombinant wood is 150MPa, the flexural elastic modulus is 12GPa, the anti-mildew performance is level 0, and the corrosion resistance is level I.

Comparative example 1:

A method of manufacturing bamboo recombinant bamboo is basically the same as the manufacturing method of Embodiment 1. The only difference is that the sequence of steps is different. Step S4 is performed first, and then step S1 is performed, that is, secondary cooking treatment (anti-mold and anti-corrosion treatment), Biological pretreatment, primary cooking treatment, saturated steam carbonization treatment, dipping treatment, drying balance treatment, slab hot pressing forming treatment, maintenance and machining treatment.

Comparative example 2:

A method for manufacturing recombinant bamboo is basically the same as the manufacturing method of Example 1. The only difference is that the sequence of steps is different. After step S1, step S4 is performed first, and then step S2 is performed, which is biological pretreatment, secondary treatment. Cooking treatment (anti-mold and anti-corrosion treatment), primary cooking treatment, saturated steam carbonization treatment, dipping treatment, drying and balancing treatment, slab hot pressing Forming, curing and machining.

Comparative example 3:

A method of manufacturing bamboo recombinant bamboo is basically the same as the manufacturing method of Example 1. The only difference is that the sequence of steps is different. After step S1, step S3 is performed first, and then step S2 is performed, that is, biological pretreatment and saturated steam carbonization. Treatment, primary cooking treatment, secondary cooking treatment, dipping treatment, drying and balancing treatment, slab hot pressing forming treatment, maintenance and machining treatment.

Example 2:

A method for manufacturing the highly weather-resistant bamboo recombinant wood for outdoor use of the present invention, including the following steps:

S1. Biological pretreatment

S1.1. Preparation of bamboo shoots: Saw fresh moso bamboo into bamboo tubes with a length of 1.55m, use a bamboo tube splitting machine to split the bamboo tubes into bamboo strips with a width of 15mm, and then use a bamboo splitting machine to cut the bamboo strips along the radial direction. Directionally split into thin bamboo strips with a thickness of 1 to 2 mm to obtain bamboo strip units.

S1.2. High-temperature steam sterilization: Place the above-mentioned bamboo unit in an autoclave with a temperature of 120°C, sterilize it with high-temperature steam for 20 minutes, take it out, and immediately transfer it to a sterilized constant temperature and humidity room. Set aside. High temperature sterilization is to kill other bacteria carried by the bamboo bundle itself.

S1.3. Drying and balancing treatment: Dry and balance the bamboo units that have been sterilized by high-temperature steam in a constant temperature and humidity room with a temperature of (25±2)°C and a humidity of (65±5)% for 2 days. Until the moisture content of the bamboo strip unit is adjusted to 40%, it is ready for use to provide better growth conditions for subsequent bamboo strip biological pretreatment.

S1.4. Preparation of white rot fungus liquid: In this example, T. versicolor is used as the biological method to pretreat the white rot fungus. After inoculating the culture medium white plate with an inoculation needle, the white plate is placed on In the incubator, take it out every day to observe the growth of white rot fungi. When the plaque area develops to 80% to 90% of the white plate area, take it out, pour it into a stainless steel grinder and crush it, and then mix the white rot fungus powder and distilled water according to the mass ratio of Mix and prepare in a ratio of 1:60 until ready for use to obtain white rot fungus liquid.

Preparation of white rot fungus culture solution: Mix potato glucose culture medium, agar and distilled water in a mass ratio of 1:1:50 and stir evenly, and add an appropriate amount of veratrol. The concentration of veratrol in the mixed solution is controlled at 0.50mmol/ L, as a supplementary inducer, is placed in a high-temperature sterilization box for sterilization treatment for 20 minutes and then taken out to obtain a white rot fungus culture liquid, which is placed in an incubator for later use.

S1.5. Biological pretreatment: First, spray the above-mentioned white rot fungus culture solution evenly onto the surface of the bamboo stem unit after drying and balancing treatment, and then spray the white rot fungus evenly on the surface of the bamboo stem unit with an inoculation amount of 20%. The inoculated bamboo units are placed horizontally on a shelf with a layer spacing of 20cm and a bottom layer height of 35cm from the ground, and are then moved to a temperature of (20±2)°C and a relative humidity of Pretreatment in a constant temperature and humidity room of (60±5)% for 20 days. Preprocessing , the constant temperature and humidity room must be forced to ventilate twice a week, the ventilation duration is 30min/time, and the ventilation flow rate is 0.05m ³ /min.

S2. Primary cooking treatment: Place the biologically pretreated bamboo shoot unit in a water bath and completely submerge it in water, continue cooking for 2 hours at a temperature of 90°C, take it out, and drain it for use.

S3. Saturated steam carbonization treatment: Under the saturated steam treatment conditions of a temperature of 140°C and a pressure of 0.3MPa, carbonize the above-mentioned bamboo shoots unit after one-time cooking treatment for 2 hours to obtain the carbonized bamboo shoots unit. During the carbonization process, the oxygen content should always be kept below 2%.

S4. Secondary cooking treatment: Place the above-mentioned carbonized bamboo shoot unit in a water bath, and then add a mixture of 1.5% boric acid, 1% borax, 0.5% isothiazolinone emulsifiable concentrate and 97% water based on mass fraction. After the anti-mildew and anti-corrosion treatment liquid is completely immersed in the bamboo unit, the bamboo unit is steamed twice at a temperature of 80°C for 3 hours and then taken out to obtain the anti-mildew and anti-corrosion treated bamboo unit. After being treated with mildew and anti-corrosion, force-dry the bamboo units in a drying kiln at a temperature of 60°C for 30 hours, take them out, and then place them in a balance with a temperature of (23±2)°C and a relative humidity of (65±5)%. Balance treatment is carried out in the chamber until the moisture content of the bamboo strip unit is approximately 12%.

S5. Bamboo fiber dipping treatment: Place the above-mentioned bamboo fiber unit that has been dried and balanced in a high-pressure impregnation tank for pre-vacuum treatment, keep it for 6 minutes, and then add phenolic resin adhesive with a solid content of 35% to make the bamboo fiber unit Completely immerse, then increase the pressure of the solution in the high-pressure impregnation tank to 1.2MPa, maintain the pressure for 10 minutes and then release the pressure, take out the bamboo raft unit and drain it to obtain the bamboo raft unit after impregnation treatment.

S6. Drying balance treatment: Dry the dipped bamboo unit in a conventional drying kiln at a temperature of 60°C for 1.5 days, take it out, and then move it to an environment with an ambient temperature of (23±2)°C and a relative humidity of (65±5 )% of the equilibrium chamber for 7 days.

S7. Slab hot press forming treatment: The above-mentioned dried and balanced bamboo strip units are assembled and placed along the fiber direction on the backing plate. After reaching the corresponding weight requirements, the resulting slab is sent together with the backing plate through the conveyor belt. Enter the hot press for hot press forming. The core temperature of the hot-pressed slab is controlled at 130°C, the hot-pressing pressure is controlled at 4.0MPa, and the hot-pressing time is controlled until the core layer temperature of the slab reaches the set temperature and then maintained for 15 minutes. Then, the plate is cooled and pressure released, and the first product of light-colored bamboo recombinant lumber slab is obtained.

S8. Maintenance and machining: Stack the above-mentioned initial light-colored bamboo recombinant lumber slabs. During stacking, the upper and lower forming slabs are separated by spacers and placed in a balance warehouse for curing 7 days; after the curing is completed, panel saws, sliding table saws, etc. are used to trim, saw, sand and thickness determine the cured formed slabs to obtain highly weather-resistant light-colored bamboo restructured bamboo for outdoor use. .

The high weather-resistant bamboo recombinant wood for outdoor use prepared in this embodiment has the natural color of bamboo. The performance parameters are shown in Table 1, that is, the density of the high weather-resistant bamboo recombinant wood for outdoor use is 1.12g/cm ³ . The static bending strength of restructured wood is 155MPa, flexural elastic modulus is 14GPa, mildew resistance is level 0, and corrosion resistance is level I.

The performance of the highly weather-resistant bamboo recombinant wood for outdoor use prepared in Examples 1-2 and the bamboo recombinant bamboo prepared in Comparative Examples 1-3 was tested, as shown in Table 1.

Table 1 Performance comparison table of the highly weather-resistant bamboo recombinant wood for outdoor use in Examples 1-2 and the bamboo recombinant bamboo in Comparative Examples 1-3

Comparative Example 1 compared to Example 1, step S4 was performed first. Since the bamboo was first subjected to anti-mold and anti-corrosion cooking treatment, sufficient macro and micro pore structures have not been formed in the bamboo material, and it is difficult for the anti-mold and anti-corrosion treatment agent to enter the cell cavity and cavity of the bamboo material. Naturally, good treatment effects cannot be obtained inside the cell wall. Secondly, the surface of bamboo that has been cooked with anti-mildew and anti-corrosion is attached with anti-mildew and anti-corrosion treatment agents, which makes it difficult to inoculate white rot fungi and cannot achieve the purpose of pre-treatment of white rot fungi. In addition, , due to the water solubility of antifungal and preservatives, cooking and saturated steam treatments cause the agents already attached to the surface of the bamboo to be dissolved and decomposed, resulting in the effect of the antifungal and antiseptic treatment on bamboo approaching zero. Comparative Example 2 Compared with Example 1, step S4 is performed first after step S1, and then step S2 and step S3 are performed. Before the anti-fungal and anti-corrosion treatment agent penetrates into the bamboo material, although the bamboo material has been pretreated by biological methods to form a The pore structure has been improved to a certain extent, but the internal porosity is still poor, making it difficult for anti-fungal and anti-corrosion treatment agents to enter the bamboo cell cavity and cell wall; and the subsequent cooking treatment and saturated steam treatment will also dissolve and decompose the pores. A large part of the anti-mildew and anti-corrosion treatment agents adhere to the surface of the bamboo, seriously affecting the treatment effect. Comparative Example 3 Compared with Example 1, step S3 is performed first after step S1, and then step S2 is performed. During the low-temperature saturated steam carbonization process, the moisture content inside the bamboo is still relatively low and is far from reaching the saturated state. Without enough high-temperature and high-pressure water, it will be difficult for the soluble substances in the bamboo to dissolve and migrate out, and it will also be difficult to further form more micro and macro pores, which will ultimately affect the treatment effect. It can be seen from this that compared with the bamboo recombinant bamboo prepared in Comparative Examples 1-3 set by the present invention and the recombinant bamboo produced by the prior art, the high weather resistance bamboo recombinant wood for outdoor use of the present invention has significantly improved the high weather resistance of bamboo. , while maintaining the excellent mechanical properties of bamboo and the color tone of the bamboo itself, which can meet the current market demand for outdoor light-colored bamboo structural construction engineering materials.

The above descriptions are only preferred embodiments of the present invention and do not limit the present invention in any form. Although the present invention has been disclosed above in terms of preferred embodiments, this is not intended to limit the present invention. Anyone familiar with the art, Without departing from the spirit and technical solutions of the present invention, the methods and technical content disclosed above can be used to make many possible changes and modifications to the technical solutions of the present invention, or to modify them into equivalent embodiments with equivalent changes. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims (10)

1. A method for manufacturing highly weather-resistant bamboo restructured materials for outdoor use, which is characterized by including the following steps:

   S1. The bamboo unit is subjected to high-temperature steam sterilization at 110°C to 125°C, then dried and balanced to a moisture content of 30% to 60%, and then biologically pretreated to obtain a pretreated bamboo unit, wherein The above-mentioned biological pretreatment is white rot fungus pretreatment;

   S2. Perform a steaming treatment on the pretreated bamboo unit in water at 90°C to 95°C, and then drain the bamboo unit to obtain a bamboo unit after the steaming treatment;

   S3. Carry out saturated steam carbonization treatment on the bamboo unit after primary cooking at a temperature of 100°C to 140°C and a pressure of 0.1MPa to 0.3MPa to obtain a carbonized bamboo unit;

   S4. The carbonized bamboo unit is subjected to a secondary cooking process at a temperature of 60°C to 80°C to prevent mildew and corrosion, and is dried and balanced until the moisture content is ≤18% to obtain a twice-cooked bamboo unit. Among them, the secondary cooking liquid contains water, isothiazolinone emulsifiable concentrate, boric acid and borax;

   S5. Dip, dry and balance the twice-cooked bamboo units, then perform blank assembly, hot press forming, and post-processing to obtain highly weather-resistant bamboo restructured timber for outdoor use.
2. The manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use according to claim 1, characterized in that in step S1, the white rot fungus pretreatment is: spraying the white rot fungus culture liquid onto the dried and balanced bamboo material On the surface of the unit, spray white rot fungus liquid on the surface of the bamboo unit with an inoculation amount of 1% to 20% for inoculation treatment. The inoculated bamboo unit will be incubated at a temperature of 18°C to 40°C and a humidity of 45% to Treat for 5 to 20 days under a constant temperature and humidity environment of 90% to obtain pretreated bamboo units; the white rot fungi are P. chrysosporium and E. taxodii ) and one or more of T. versicolor.
3. The manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use according to claim 2, characterized in that the preparation process of the white rot fungus culture liquid is as follows: potato glucose culture medium, agar and distilled water are mixed at a ratio of 1:1:50 The mass ratio is mixed and stirred evenly, with or without supplementary inducer, and after sterilization, a white rot fungus culture liquid is obtained, wherein the supplementary inducer includes one of Mn ²⁺ , sugar substances and amino acid aromatic compounds. One or more kinds; the white rot fungus liquid is made of a mixture of white rot fungi and water, and the mass ratio of white rot fungi and water is 1:10 to 100;

   And/or, the bamboo unit after the inoculation treatment is placed horizontally on a shelf in a constant temperature and humidity room for constant temperature and humidity treatment. The layer spacing of the shelf is 15cm～25cm, and the distance between the lowest layer of the shelf is The floor is ≥20cm, the ventilation treatment frequency of the constant temperature and humidity room is 2 times/week to 3 times/week, the ventilation treatment time is 20min/time~40min/time, and the gas flow rate of the ventilation treatment is 0.01m ³ /min~0.1m ³ /min.
4. The manufacturing method of highly weather-resistant bamboo restructured wood for outdoor use according to claim 1, characterized in that, in step S3, the oxygen content is kept <2% during the saturated steam carbonization process.
5. The manufacturing method of highly weather-resistant bamboo restructured wood for outdoor use according to claim 1, characterized in that in step S4, the mass fraction of boric acid in the secondary cooking liquid is 1% to 4%, and borax is 1% to 4%. 1%, isothiazolinone emulsifiable concentrate is 0.5% to 1%, and water is 94% to 97%.
6. The manufacturing method of high weather-resistant bamboo restructured timber for outdoor use according to claim 1, characterized in that, in step S1, the bamboo unit includes a bamboo bundle unit or a bamboo strip unit, and the bamboo bundle unit is split into bamboo tubes. The bamboo strip unit is obtained by splitting the bamboo tube into bamboo strips and then splitting into bamboo strips. The time of the high-temperature steam sterilization treatment is 15min to 60min; and/or, steps In S2, the time of the primary cooking treatment is 0.5h-2h; and/or, in step S3, the time of the saturated steam carbonization treatment is 1h-2h; and/or in step S4, the secondary cooking The processing time is 0.5h~3h.
7. The manufacturing method of highly weather-resistant bamboo recombinant wood for outdoor use according to any one of claims 1 to 6, characterized in that in step S4, the equipment used for drying is a drying kiln or a mesh belt dryer, so The drying temperature is 50°C to 80°C, the balancing treatment temperature is 20°C to 30°C, and the relative humidity of the balancing treatment is 50% to 70%.
8. The manufacturing method of high weather-resistant bamboo recombinant wood for outdoor use according to any one of claims 1 to 6, characterized in that in step S5, the impregnation adopts a normal pressure impregnation method or a pressure impregnation method, and the The process of the pressure impregnation method is as follows: place the twice-cooked bamboo unit in a high-pressure impregnation equipment for pre-vacuum treatment, keep it for 6 to 15 minutes, and add a phenolic resin adhesive with a solid content of 20% to 35% to the bamboo. The unit is completely submerged, immersed under a pressure of 0.5MPa to 1.2MPa for 5min to 10min, then relieved and drained;

   And/or, the drying temperature is 50°C to 60°C, the drying time is 0.5 days to 3 days; the balancing treatment temperature is 20°C to 35°C, and the relative humidity of the balancing treatment is 60 %～75%, the time of the balancing treatment is 7 days to 15 days;

   And/or, the hot pressing forming is one-time hot pressing forming, the hot pressing temperature is 130°C ~ 155°C, the hot pressing pressure is 4.0MPa ~ 6.0MPa, and when the core layer temperature of the slab reaches the set temperature, it is maintained for 15min ~ 35min ;

   And/or, the post-processing is curing treatment and machining process. The curing process is to store the hot-pressed slabs in close piles in an indoor environment for 7 to 14 days. The machining process includes using mechanical The processing equipment performs edge trimming, sawing and sanding to determine the thickness of the cured slab.
9. A high weather-resistant bamboo recombinant material for outdoor use produced by the manufacturing method of high weather-resistant bamboo recombinant material for outdoor use according to any one of claims 1 to 8.
10. The high weather-resistant bamboo composite material for outdoor use according to claim 9, characterized in that the high weather-resistant bamboo composite material for outdoor use The weather-resistant bamboo recombinant wood has the natural color of bamboo or is close to the natural color of bamboo. The density of the high-weather-resistant bamboo recombinant wood for outdoor use is 0.9g/cm ³ to 1.3 g/cm ³ . The high-weather-resistant bamboo recombinant wood for outdoor use The static bending strength is >100MPa, the elastic modulus of the high weather-resistant bamboo recombinant wood for outdoor use is ≥12 GPa, the mildew-proof performance of the high weather-resistant bamboo recombinant wood for outdoor use is level 0, and the corrosion resistance is level I.