Bamboo oriented strand board, method of making and use in outdoor flooring

Abstract

The application discloses a kind of bamboo directional shaving board and its preparation method and application in making outdoor floor.The preparation method comprises the following steps: (1) bamboo is soaked in lye and cooked and softened;(2) the bamboo after softening is carbonized;(3) the bamboo after carbonization is enhanced;(4) the bamboo after polarity enhancement is shaved, and bamboo shaving is obtained;(5) the bamboo shaving is dried, glued, and the board blank is obtained after directional laying, and the board blank is obtained after steaming, hot pressing and cold pressing, and the bamboo directional shaving board is obtained.The preparation method can not only be implemented continuously and automatically, but also the bamboo directional shaving board prepared has high strength, excellent corrosion and mildew resistance, and is suitable for making outdoor floor.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of outdoor floor, and particularly relates to a bamboo directional shaving board and a preparation method thereof and application thereof in manufacturing outdoor floor. BACKGROUND

[0002] Bamboo has the advantages of rich resources, high strength, good toughness, large hardness, good plasticity, strong carbon fixation capacity, etc., and is therefore widely used in building structure materials, floor materials, furniture and other products. As an environmentally friendly, wear-resistant, moisture-resistant and insect-resistant material, bamboo is particularly suitable for manufacturing outdoor floor.

[0003] At present, the outdoor floor made of bamboo usually includes two types: reconstituted bamboo floor and co-extrusion bamboo plastic floor. The reconstituted bamboo floor is manufactured through a series of processes such as softening, defibration, rolling, bamboo bundle drying, glue soaking, drying again, assembling, hot pressing, cooling and planing. Although the reconstituted bamboo floor has high density and strength, the production of the reconstituted bamboo floor still has the following problems: (1) the continuous and automatic level of the production equipment is low, the labor cost is high, and the production efficiency is low; (2) the production quality is unstable, and quality accidents such as product cracking and wire jumping frequently occur; (3) the amount of glue used is large, and the cost of glue is high; (4) the material loss is serious during the bamboo processing and rolling and transportation; (4) the production process needs to go through 2-3 times of drying, and the energy consumption is large.

[0004] The co-extrusion bamboo plastic floor is made of high-density polyethylene (HDPE) and bamboo powder as main raw materials, and is supplemented with coupling agent, lubricant, antioxidant, ultraviolet stabilizer and other auxiliary materials, and is manufactured through the steps of mixing, granulation, extrusion and cooling molding. The co-extrusion bamboo plastic floor has the following disadvantages when used outdoors: (1) if the day and night temperature difference of the use environment is large, the surface and core layer temperature of the co-extrusion bamboo plastic floor will not change uniformly, which will easily cause expansion and deformation, and further affect the service life of the co-extrusion bamboo plastic floor; (2) in order to save the cost of formula and production process, some small plastic wood material factories will reduce or even not use antioxidant, coupling agent and other related reinforcing additives, and in this case, the co-extrusion bamboo plastic floor will have serious discoloration, material brittleness, cracking, expansion and mildew; (3) the plastic component contained in the floor has weak resistance to ultraviolet rays, and is prone to aging and wire jumping.

[0005] Therefore, it is necessary to develop a bamboo floor with excellent comprehensive performance (including high mechanical strength, corrosion and mildew resistance, etc.) and convenient continuous and automatic production to meet the outdoor use. SUMMARY

[0006] The application aims to provide a bamboo directional shaving board, a preparation method thereof and an application of the bamboo directional shaving board in outdoor floor manufacturing.

[0007] To achieve the above-mentioned application aims, the technical scheme of the application is as follows:

[0008] A preparation method of a bamboo directional shaving board, the preparation method comprising the following steps:

[0009] (1) soaking and cooking the bamboo in an alkali solution to soften the bamboo;

[0010] (2) performing carbonization treatment on the softened bamboo;

[0011] (3) performing polarity enhancement treatment on the carbonized bamboo;

[0012] (4) shaving the bamboo with enhanced polarity to obtain bamboo shavings;

[0013] (5) drying, gluing and directionally laying the bamboo shavings to obtain a board blank, and the board blank is subjected to steaming, hot pressing and cold pressing to obtain the bamboo directional shaving board.

[0014] In the preparation method, the soaking in the alkali solution can increase the roughness of the bamboo surface, so that more active reaction sites are exposed on the bamboo surface, and the soaking in the alkali solution is supplemented by cooking, so that the alkali solution can enter the interior of the bamboo, which can further promote the exposure of the active reaction sites in the interior of the bamboo and soften the bamboo, both of which can effectively enhance the interfacial bonding strength between the subsequent bamboo shavings and the adhesive, and the softened bamboo is easy to be processed into shavings, thereby reducing the wear of the cutter; the carbonization treatment is performed on the bamboo in a high-temperature and oxygen-deficient environment, so that the water and volatile organic substances in the bamboo are removed, and the lignin is converted into carbon, which can increase the density and hardness of the bamboo, improve the bending strength, stability and antibacterial property of the bamboo, and reduce the water absorption and flammability of the bamboo, so as to endow the bamboo directional shaving board with the antifungal and anticorrosive properties; the polarity enhancement treatment can further improve the interfacial bonding strength between the subsequent bamboo shavings and the adhesive, thereby endowing the bamboo directional shaving board with more excellent mechanical strength. The bamboo shavings obtained through the above modification have the characteristics of size consistency, thermal stability and antibacterial property, and the surface of the bamboo shavings has a large number of hydroxyl active groups, which can reduce the contact angle of the bamboo shavings and improve the wettability, so as to not only reduce the amount and cost of the adhesive, but also endow the bamboo directional shaving board with excellent mechanical strength and antifungal and antibacterial properties, which is suitable for the use environment of outdoor floor.

[0015] The present application modifies the bamboo material with alkali solution, carbonizes and enhances the polarity of the bamboo material before preparing the bamboo shaving, instead of directly performing the above operations on the bamboo shaving. This is because the thickness of the bamboo shaving is usually 1mm or below, and too many operations will destroy the structure of the bamboo shaving, which will result in a large loss of the bamboo shaving and affect the strength of the shaving board.

[0016] As a preferred embodiment, the method for preparing the bamboo directional shaving board comprises the following steps:

[0017] (1) soaking and cooking the bamboo material in alkali solution to soften the bamboo material;

[0018] As a further preferred embodiment, the green-removed and yellow-removed bamboo material is first made into bamboo strips with a width of 1-5cm, and then soaked in alkali solution with a concentration of 1-5% and cooked at 85-95℃ for 1-3h.

[0019] The bamboo strips with a narrow width are beneficial to the penetration of the alkali solution into the fiber gap, thus improving the modification effect of the alkali solution.

[0020] (2) carbonizing the softened bamboo material;

[0021] As a further preferred embodiment, the softened bamboo material is placed in a carbonization device and carbonized at 180-200℃ for 60-180min to remove water and organic volatile substances.

[0022] (3) enhancing the polarity of the carbonized bamboo material;

[0023] As a further preferred embodiment, the carbonized bamboo strips are cut to a length of about 20cm, and then subjected to the polarity enhancement treatment. The polarity enhancement treatment is to immerse the carbonized bamboo material in a polar substance solution. At this time, the softened and carbonized bamboo material is full of voids, which enables the polar substance to quickly infiltrate the bamboo material and become an integral whole. The bamboo material with strong polarity can be more effectively bonded with the adhesive in the subsequent process. The immersion of the polar substance solution also enables the carbonized bamboo material to have a certain water content, which is beneficial to the subsequent shaving of the complete bamboo shaving and reduces the rate of debris.

[0024] The selection of the polar substance is various. As an example of the specific embodiment, the polar substance solution used in the present application is a polyethylene glycol solution with a molecular weight of 200-10000Da and a mass percentage of 0.5-2%. The immersion temperature is 40-60℃, and the immersion time is 30-60min. During the immersion process, the polyethylene glycol solution is kept in a flowing state to promote the entry of the polar substance into the voids in the bamboo material and the adsorption of the polar substance on the surface of the bamboo material.

[0025] As a preferred embodiment, the molecular weight of the polyethylene glycol used is 600Da.

[0026] (4) planing the bamboo material with the enhanced polarity to obtain bamboo shavings;

[0027] As a further optimization, the bamboo shavings have a thickness of 0.7-1mm, a length of 19.5-21cm, and a width of 10-50mm.

[0028] In the present application, the length of the bamboo shavings reaches 19.5-21cm, which is due to the soft bamboo material after the previous alkali cooking operation, which facilitates planing of long and complete bamboo shavings, and the long bamboo shavings can further improve the strength of the bamboo oriented shaving board.

[0029] (5) drying, gluing and directionally laying the bamboo shavings to obtain a board blank, which is then subjected to steaming, hot pressing and cold pressing to obtain the bamboo oriented shaving board;

[0030] As a further optimization, the gluing step comprises: sequentially using MDI glue and phenolic resin to implement atomized glue spraying operation on the bamboo shavings, wherein the MDI glue has a gluing amount of 1-10%, the phenolic resin has a gluing amount of 1-15%, and the bamboo shavings are stirred uniformly to ensure that the glue sticking amount reaches more than 85%;

[0031] In the present application, the bamboo shavings are fully impregnated with polar substances, so that only atomized glue spraying is needed to glue the bamboo shavings, and the gluing amount can be greatly reduced.

[0032] As a further optimization, the directionally laying step comprises: laying the bamboo shavings along the longitudinal direction of the board blank, with a laying directional rate of ≥90%, an included angle θ between the direction of the bamboo shavings and the transverse direction of the board blank of 80°≤θ≤100°, and a set bamboo shaving lap length a of 1 / 3≤a≤1 / 2.

[0033] As a further optimization, the steaming step uses steam pressure of 0.8-1.2MPa, steam temperature of 160-180℃, and steaming time of 2-5min; the specific parameters are set according to the thickness and humidity of the board blank.

[0034] As a further optimization, the hot pressing step uses hot pressing pressure of 4-8MPa, hot pressing temperature of 160-200℃, and hot pressing time of 60-75s / mm.

[0035] The present application also provides a bamboo oriented shaving board prepared by the above preparation method. The shaving board of the present application has a static bending strength of more than 142MPa, an elastic modulus of more than 15320Mpa, a bending strength of more than 136Mpa, a water absorption thickness expansion rate of less than 4.5%, a water absorption width expansion rate of less than 0.5%, and a mold infection value of less than 2, and has excellent comprehensive performance.

[0036] The application also provides a bamboo shaving, which is prepared by the following method.

[0037] (1) soaking and cooking the bamboo in an alkali solution to soften it;

[0038] (2) carbonizing and drying the softened bamboo;

[0039] (3) enhancing the polarity of the carbonized bamboo;

[0040] (4) shaving the bamboo with enhanced polarity to obtain the bamboo shaving.

[0041] The specific implementation of each step is the same as described above.

[0042] The application also provides the use of the bamboo directional shaving board described above in the preparation of outdoor floor. The bamboo directional shaving board has high mechanical strength, excellent moisture resistance and mildew resistance, and the prepared outdoor floor will not crack, mildew or rot.

[0043] Compared with the prior art, the application has the following beneficial effects:

[0044] (1) In the preparation method of the application, the bamboo is sequentially subjected to alkali soaking and cooking, carbonization treatment and polarity enhancement treatment before the bamboo shaving is prepared to modify the properties of the bamboo. The alkali soaking can increase the roughness of the bamboo surface, so that more active reaction sites are exposed on the bamboo surface. The alkali soaking is followed by cooking to further strengthen the effect of the alkali, so that the alkali can enter the interior of the bamboo. On the one hand, this can further promote the exposure of the active reaction sites in the interior of the bamboo, and on the other hand, it can soften the bamboo. Both of these can effectively enhance the interfacial bonding strength between the subsequent bamboo shaving and the adhesive. Meanwhile, the softened bamboo is easy to be processed into shavings, reducing the wear of the cutting tool. The carbonization treatment is to treat the bamboo in a high-temperature and oxygen-deficient environment, so that the water and volatile organic substances in the bamboo are removed, and the lignin is converted into carbon. This process can increase the density and hardness of the bamboo, improve the bending strength, stability and antibacterial property of the bamboo, and reduce the water absorption and flammability of the bamboo, so as to endow the bamboo with the properties of mildew resistance and rot resistance. The polarity enhancement treatment can further improve the interfacial bonding strength between the subsequent bamboo shaving and the adhesive, so as to endow the bamboo directional shaving board with more excellent mechanical strength. The bamboo shaving obtained by the above modification has the characteristics of size consistency, thermal stability and antibacterial property, and the surface of the bamboo shaving has a large number of hydroxyl active groups, which makes the contact angle of the bamboo shaving small and the wettability high. This not only can reduce the amount and cost of adhesive used, but also can make the prepared bamboo directional shaving board have excellent mechanical strength and mildew resistance and antibacterial property, which is suitable for the use environment of outdoor floor.

[0045] (2) The present application modifies the bamboo material with alkali solution, carbonizes and enhances the polarity before preparing the bamboo shaving, instead of directly operating the above-mentioned operations on the bamboo shaving. The thickness of the bamboo shaving is usually 1mm or below. Too many operations will destroy the structure of the bamboo shaving, which leads to large loss of the bamboo shaving and affects the strength of the shaving board.

[0046] (3) The static bending strength of the bamboo directional shaving board prepared by the present application can reach 142MPa or above, the elastic modulus can reach 15320MPa or above, the bending strength can reach 136MPa or above, the water absorption thickness expansion rate can reach 4.5% or below, the water absorption width expansion rate can reach 0.5% or below, and the mold infection value can reach 2 or below. The comprehensive performance is excellent, and the outdoor floor prepared will not crack, mold, rot, etc. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 It is a sectional view of the bamboo directional shaving board of the present application. DETAILED DESCRIPTION

[0048] The technical solutions of the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0049] Example 1

[0050] The present embodiment is a kind of bamboo directional shaving board, and the preparation method comprises the following steps:

[0051] (1) Soak and cook the bamboo material in alkali solution to soften it;

[0052] Specifically, first cut the raw bamboo into sections, take the middle part of the bamboo, remove the green and yellow parts, and process them into bamboo strips with a width of 5cm. Then soak the bamboo strips in a potassium hydroxide solution with a mass concentration of 2% for 30min, and heat the alkali solution to 90℃, and cook for 1 hour to soften the bamboo strips;

[0053] (2) Carbonize the softened bamboo material;

[0054] Specifically, place the softened bamboo material in a carbonization furnace at 180-200℃ for 180min to remove water and organic volatile substances;

[0055] (3) Enhance the polarity of the carbonized bamboo material;

[0056] Specifically, first cut the carbonized bamboo strips to a length of 20cm, and then immerse the bamboo strips in a 1wt% polyethylene glycol (average molecular weight 600) solution, with an immersion temperature of 40℃ and an immersion time of 30min. During the immersion, use an air blowing device to keep the polyethylene glycol solution in a flowing state, with an air flow rate of 0.5L / min;

[0057] (4) The bamboo material with enhanced polarity is planed to obtain bamboo shavings;

[0058] Specifically, the polarity-enhanced bamboo strips are placed into a rotary shaving machine with a 12cm*21cm hopper to produce bamboo shavings with a thickness of about 0.7mm to 1mm, a length of about 19.5-21cm, and a width of about 10mm to 50mm.

[0059] (5) After drying, gluing, and oriented laying of bamboo shavings, a board blank is obtained. The board blank is then steamed, hot-pressed and cold-pressed to obtain the bamboo oriented particleboard.

[0060] Specifically, it includes the following steps:

[0061] ① Bamboo shavings drying: Place the bamboo shavings in a rotary drying equipment and dry them slowly at a temperature of 200℃ for 1-2 hours. The specific time should be based on controlling the moisture content of the bamboo shavings to below 5-10%.

[0062] ② Bamboo shavings adhesive application: The bamboo shavings are sprayed with MDI with a concentration of 5% and phenolic resin with a concentration of 10% in sequence, and stirred evenly in a rotary atomizing adhesive mixer to achieve an adhesive coverage of more than 85% for the bamboo shavings.

[0063] ③ Oriented installation: Place the shavings that have been glued into the oriented installation machine, so that the shavings are installed along the longitudinal direction of the board blank. The installation orientation rate is ≥90%, and the angle θ between the direction of the bamboo shavings and the transverse direction of the board blank is 80°≤θ≤100°. Set the overlap length of the bamboo shavings a to 1 / 3, and obtain a board blank with a thickness of 15cm and a moisture content of 8%.

[0064] ④ Slab steaming: Steam pressure is controlled at 1.2MPa, steam temperature at 160℃, and steaming time is 2 minutes;

[0065] ⑤ Hot pressing and shaping: The slab is placed in a hot press for hot pressing. The process parameters are set as follows: hot pressing pressure 7MPa, hot pressing temperature 200℃, hot pressing time 75s / mm.

[0066] ⑥ Cold pressing and shaping: The hot-pressed board blank is placed into the cold pressing system with a cold pressing pressure of 1 MPa. After the board blank temperature drops to room temperature, the mold is opened and the board is taken out to obtain the bamboo oriented strand board of this embodiment.

[0067] from Figure 1 As can be seen from the cross-sectional diagram of the board, the bamboo shavings are all laid longitudinally.

[0068] Example 2

[0069] This embodiment is a bamboo oriented strand board, and its preparation method is basically the same as that of embodiment 1, except that: in step (1), the steaming time is 2 hours.

[0070] Example 3

[0071] The bamboo oriented strand board of the present example was prepared by the same method as that of Example 1, except that the cooking time in step (1) was 3 hours.

[0072] Comparative Example 1

[0073] The bamboo oriented strand board of the present example was prepared by the same method as that of Example 1, except that only alkali soaking was performed in step (1) without cooking.

[0074] The bamboo oriented strand boards prepared in Examples 1-3 and Comparative Example 1 were tested for their physical properties, and the results are shown in Table 1.

[0075] Table 1

[0076]

[0077] As shown in Table 1, in Examples 1, 2 and 3, the density, static bending strength, elastic modulus and bending strength of the bamboo oriented strand boards were all improved with the increase of cooking time, and the performance was improved most obviously in Example 3. Compared with Example 1, the static bending strength of Example 3 was increased by 9 MPa, the elastic modulus was increased by 770 MPa, the bending strength was increased by 9 MPa, the water absorption thickness expansion rate and water absorption width expansion rate were both decreased, and the mold infection value was reduced to 0.

[0078] In Comparative Example 1, since no cooking treatment was performed, the physical properties were all lower than those of Examples 1-3, especially the bending strength was only 100 MPa, which was 36 MPa lower than that of Example 1.

[0079] Therefore, cooking treatment is one of the key steps in the preparation of bamboo oriented strand board, which can significantly improve the physical properties and antibacterial properties.

[0080] Example 4

[0081] The bamboo oriented strand board of the present example was prepared by the same method as that of Example 1, except that the molecular weight of the polyethylene glycol solution in step (3) was 200 Da.

[0082] Example 5

[0083] The bamboo oriented strand board of the present example was prepared by the same method as that of Example 1, except that the molecular weight of the polyethylene glycol solution in step (3) was 1000 Da.

[0084] Example 6

[0085] The bamboo directional shaving board of the embodiment is prepared by the method basically same as that of embodiment 1, with the difference that the molecular weight of the polyethylene glycol solution in step (3) is 10000 Da.

[0086] Comparative example 2

[0087] The bamboo directional shaving board of the embodiment is prepared by the method basically same as that of embodiment 1, with the difference that step (3) is not set.

[0088] The bamboo directional shaving boards prepared in the above embodiment 4-6 and comparative example 2 are tested in physical properties, and the test results are shown in table 2.

[0089] Table 2

[0090]

[0091] As shown in table 2, in embodiment 1, 4, 5, 6, the polyethylene glycol treatment can improve the static bending strength, elastic modulus and other physical properties of the board, and the performance improvement in embodiment 1 (polyethylene glycol molecular weight is 600 Da) is more obvious, followed by embodiment 4 (polyethylene glycol molecular weight is 200 Da); in comparative example 2, step (3) is not set, that is, there is no polyethylene glycol solution impregnation treatment, and compared with other embodiments, it performs worse, and the physical properties are slightly lower than those of other embodiments.

[0092] Embodiment 7

[0093] The bamboo directional shaving board of the embodiment is prepared by the method basically same as that of embodiment 1, with the difference that in step (5), the mutual overlap length of the bamboo shavings is 1 / 2 during directional paving.

[0094] Comparative example 3

[0095] The bamboo directional shaving board of the comparative example is prepared by the method basically same as that of embodiment 1, with the difference that in step (5), the mutual overlap length of the bamboo shavings is 1 / 4 during directional paving.

[0096] Comparative example 4

[0097] The bamboo directional shaving board of the comparative example is prepared by the method basically same as that of embodiment 1, with the difference that in step (5), the mutual overlap length of the bamboo shavings is 2 / 3 during directional paving.

[0098] The bamboo directional shaving boards prepared in the above embodiment 7 and comparative examples 3-4 are tested in physical properties, and the test results are shown in table 3.

[0099] Table 3

[0100]

[0101] As can be seen from Table 3, compared with Example 1, the bamboo shaving board of Example 7 has a slight decrease in static bending strength, elastic modulus, bending strength and water absorption thickness expansion rate, etc. This indicates that when oriented paving, the preparation method of the bamboo shaving with the mutual overlapping length of the bamboo shaving being 1 / 2 relative to the 1 / 3 overlapping length may cause slight decrease in some physical properties.

[0102] Compared with Comparative Example 3, Example 7 has similar performance in elastic modulus, bending strength and water absorption thickness expansion rate, but the static bending strength is slightly lower. This indicates that increasing the mutual overlapping length of the bamboo shaving from 1 / 4 to 1 / 2 may have a certain negative impact on the static bending strength.

[0103] Compared with Comparative Example 4, the mechanical properties of Example 7 are all relatively excellent, indicating that reducing the mutual overlapping length of the bamboo shaving from 2 / 3 to 1 / 2 is beneficial to improve the mechanical properties of the board.

[0104] The above results show that when oriented paving, it is preferred to set the mutual overlapping length of the bamboo shaving between 1 / 3 and 1 / 2 of the length of the bamboo shaving.

Claims

1. A method for preparing bamboo oriented strand board, characterized in that, Includes the following steps: (1) Soak the bamboo strips in an alkaline solution and steam them to soften them; In step (1), the bamboo material that has been cleaned of green and yellow is first made into bamboo strips with a width of 1-5cm, and then soaked in an alkaline solution with a concentration of 1-5% and steamed at 85-95℃ for 1-3 hours. (2) Carbonize the softened bamboo strips; In step (2), the softened bamboo strips are carbonized at 180-200℃ for 60-180 minutes to further remove moisture and volatile organic compounds; (3) The carbonized bamboo strips are subjected to polarity enhancement treatment; The polarity enhancement treatment involves immersing the carbonized bamboo strips in a polar substance solution, which is a polyethylene glycol solution with a molecular weight of 600 Da and a mass concentration of 0.5-2%. The immersion temperature is 40-60℃, and the immersion time is 30-60 min. During the immersion process, the polyethylene glycol solution is kept in a flowing state. (4) The bamboo strips with enhanced polarity are planed to obtain bamboo shavings; (5) After drying, gluing, and oriented laying of bamboo shavings, a board blank is obtained. The board blank is then steamed, hot-pressed and cold-pressed to obtain the bamboo oriented particleboard. In step (5), the directional paving step includes: paving bamboo shavings along the longitudinal direction of the board blank, with a paving orientation rate of ≥90%, the angle θ between the direction of the bamboo shavings and the transverse direction of the board blank being 80°≤θ≤100°, and setting the bamboo shavings overlap length a to 1 / 3.

2. The method for preparing bamboo oriented strand board as described in claim 1, characterized in that, In step (4), the dimensions of the bamboo shavings are: thickness 0.7-1 mm, length 19.5-21 cm, and width 10-50 mm.

3. The method for preparing bamboo oriented strand board as described in claim 1, characterized in that, In step (5), the adhesive application step includes: applying MDI adhesive and phenolic resin to bamboo shavings in sequence using atomized spraying, wherein the amount of MDI adhesive applied is 1-10% and the amount of phenolic resin applied is 1-15%, and the mixture is stirred evenly to ensure that the adhesive application reaches more than 85%. The steam pressure used in the spraying and steaming step is 0.8-1.2 MPa, the steam temperature is 160-180℃, and the spraying and steaming time is 2-5 min. The hot pressing forming step uses a hot pressing pressure of 4-8 MPa, a hot pressing temperature of 160-200℃, and a hot pressing time of 60-75 s / mm.

4. Bamboo oriented strand board prepared by the preparation method according to any one of claims 1-3.

5. A type of bamboo shavings, characterized in that, It is prepared by the following method: (1) Soak the bamboo strips in an alkaline solution and steam them to soften them; In step (1), the bamboo material that has been cleaned of green and yellow is first made into bamboo strips with a width of 1-5cm, and then soaked in an alkaline solution with a concentration of 1-5% and steamed at 85-95℃ for 1-3 hours. (2) Carbonize and dry the softened bamboo strips; (3) The carbonized bamboo strips are subjected to polarity enhancement treatment; The polarity enhancement treatment involves immersing the carbonized bamboo strips in a polar substance solution, which is a polyethylene glycol solution with a molecular weight of 600 Da and a mass concentration of 0.5-2%. The immersion temperature is 40-60℃, and the immersion time is 30-60 min. During the immersion process, the polyethylene glycol solution is kept in a flowing state. (4) The bamboo strips with enhanced polarity are cut to obtain the bamboo shavings.

6. The application of bamboo oriented strand board as described in claim 4 in the manufacture of outdoor flooring.

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