CN113246258A - High-strength bamboo recombined material with bamboo bionic structure and preparation method thereof - Google Patents
High-strength bamboo recombined material with bamboo bionic structure and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
- B27J1/00—Mechanical working of cane or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- 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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
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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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Abstract
The invention relates to a high-strength bamboo recombined material with a bamboo bionic structure and a preparation method thereof. The bamboo green layer bamboo bundle is the outermost layer of the bamboo chips after the bamboo surface and the bamboo inner layer are removed; the middle layer bamboo bundle is a middle layer after the bamboo inner layer and the outermost layer of the bamboo skin are removed from the bamboo chips; the tabasheer bamboo bundle is the remaining part of bamboo chips after the bamboo bundle is removed. The advantages are that: the method comprises the steps of utilizing the characteristic that the mechanical strength of bamboo is gradually weakened from the outer side to the inner side to divide the bamboo wall from the outside to the inside along the cross section in a grading manner to form a bamboo green layer, a middle layer and bamboo chips of a tabasheer layer, then untwining the bamboo green layer and bamboo chips into bamboo bundle units, then paving the bamboo bundles in the bamboo wall in sequence to prepare the bamboo recombinant material with the bamboo bionic structure, improving the utilization rate and the mechanical strength of the bamboo, and adjusting the mechanical property of the bamboo recombinant material by changing the paving ratio of the bamboo green layer and the bamboo bundles of the middle layer, thereby preparing the bamboo recombinant material with different application requirements.
Description
Technical Field
The invention discloses a high-strength bamboo recombined material with a bamboo bionic structure and a preparation method thereof, and belongs to the technical field of bamboo and wood processing.
Background
China belongs to a country with abundant bamboo resources, but the utilization rate of bamboo is quite low, the application of bamboo is greatly limited due to the appearance shape and the hollow structure of the bamboo, the occurrence of recombined bamboo greatly breaks through the limitation, and a continuous production line with higher automation degree can be formed, the mechanical property is excellent, the utilization rate of the bamboo can be improved, and the like. Currently, the main production method of the recombined bamboo lumber is to cut a bamboo tube into bamboo chips with the width of 3-5 cm, remove green and yellow, untwin the bamboo chips into a reticular bamboo bundle unit, and perform hot pressing or cold pressing after gum dipping to form the recombined bamboo board or the square lumber. In order to ensure the uniformity of the bamboo bundle unit material, more bamboo green and bamboo yellow parts are usually removed in the processing process, only the middle layer of the cross section of the bamboo is adopted, because the vascular bundles are distributed relatively uniformly on the parts and the density difference is not large, although the method is convenient for paving the plate blank, and the hot pressing process is relatively simple, the utilization rate of the bamboo is relatively low, and the prepared bamboo recombined material presents a homogeneous structure and is usually used for manufacturing furniture and floors but can not completely meet the requirements of materials for building structures.
Disclosure of Invention
The invention provides a high-strength bamboo recombined material with a bamboo bionic structure and a preparation method thereof, aiming at solving the problems that the current bamboo recombined material has simple structure, uniform density distribution, relatively low utilization rate of bamboo, and the product performance can not completely meet the requirements of materials for building structures, and the like, fully utilizing the growth structure characteristics of the bamboo, namely the mechanical characteristics that the mechanical strength of the cross section of the bamboo wall is gradually weakened from the outer side to the inner side, subdividing the bamboo wall from the outer side to the inner side from the cross section to form a bamboo green layer, an intermediate layer and a bamboo yellow layer, then respectively defibering into bamboo bundle units with different forms, and reasonably assembling by utilizing the structural characteristics of the bamboo and combining the mechanical theory of a composite laminated plate to prepare the high-strength recombined material with the bamboo bionic structure.
The technical solution of the invention is as follows:
a high-strength bamboo recombined material with a bamboo bionic structure is characterized by comprising a first bamboo green layer bamboo bundle, a second middle layer bamboo bundle, a third bamboo yellow layer bamboo bundle, a fourth middle layer bamboo bundle and a fifth bamboo green layer bamboo bundle from top to bottom, wherein the five bamboo bundles are fixedly connected by gluing; the first green layer bamboo bundle and the fifth green layer bamboo bundle are outermost layers with the thickness of 1.5-2.5 mm after green and yellow bamboos of bamboo chips are removed; the second middle layer bamboo bundle and the fourth middle layer bamboo bundle are formed by removing bamboo green and bamboo yellow from bamboo chips, are adjacent to the outermost bamboo chips with the thickness of 1.5-2.5 mm, and are 2.0-4.0 mm; the tabasheer layer bamboo bundle is formed by removing green bamboos and tabasheers from bamboo chips, and is close to the tabasheer part, and the thickness of the tabasheer layer bamboo bundle is about 3.0-5.0 mm. And finally, mechanically untwining all the bamboo chips to prepare bamboo bundles.
A high-strength bamboo recombined material with a bamboo bionic structure is characterized in that a first bamboo green layer bamboo bundle and a fifth bamboo green layer bamboo bundle respectively account for 5-30% of a plate blank by mass; the second middle layer bamboo bundle and the fourth middle layer bamboo bundle respectively account for 15-30% of the slab by mass; the third tabasheer layer bamboo bundle layer plate blank accounts for 10-40% of the mass composition.
A preparation method of a high-strength bamboo recombined material with a bamboo bionic structure is characterized by comprising the following steps:
firstly, cutting a fresh bamboo tube into bamboo chips with the width of 6-8 cm, removing bamboo green and tabasheer, and then carrying out grading and splitting along the cross section of the bamboo wall from outside to inside to sequentially form a bamboo green layer, a middle layer and a tabasheer layer bamboo chip; the thickness of the split bamboo green layer bamboo chips is 1.5-2.5 mm, the thickness of the middle layer bamboo chips is 2.0-4.0 mm, and the rest part is the tabasheer layer bamboo chips with the thickness of 3.0-5.0 mm.
Respectively carrying out mechanical defibering treatment on the bamboo green layer, the middle layer and the tabasheer layer bamboo chips prepared in the step one, wherein the bamboo green layer is prepared into bamboo bundles with the bamboo green layer and the fiber fineness of 1-2 mm through adjusting the defibering process; the middle layer is prepared into a middle layer bamboo bundle with the fiber fineness of 800-1000 microns through the adjustment and defibering process; the tabasheer layer is prepared into tabasheer layer bamboo bundles with the fiber fineness of 500-800 microns through the adjustment and fluffing process. And respectively putting the prepared bamboo bundles of the outer layer of bamboo, the bamboo bundles of the middle layer and the bamboo bundles of the inner layer into different drying chambers, and drying at about 102 ℃ for 24 hours.
And (III) putting the dried bamboo bundles of the bamboo green layer, the bamboo bundles of the middle layer and the bamboo bundles of the bamboo yellow layer into iron frames respectively for impregnation treatment, wherein the adhesive is phenolic resin, the impregnation time of the bamboo bundles of the bamboo green layer is 10-15 min, the impregnation time of the bamboo bundles of the middle layer is 12-18 min, and the impregnation time of the bamboo bundles of the bamboo yellow layer is 18-25 min.
And (IV) respectively putting the dipped bamboo green layer bamboo bundles, the middle layer bamboo bundles and the bamboo yellow layer bamboo bundles into a drying chamber, and drying at 60-80 ℃ until the water content is 12-16%.
Fifthly, paving the bamboo recombined material from top to bottom sequentially to form a bamboo green layer bamboo bundle (1), a middle layer bamboo bundle (2), a tabasheer layer bamboo bundle (3), a middle layer bamboo bundle (4) and a bamboo green layer bamboo bundle (5);
and (VI) respectively adjusting the mass proportions of the bamboo green layer, the middle layer and the tabasheer layer bamboo bundles according to the layering sequence of the step (five) and the requirements of the mechanical properties of the bamboo recombined material, so as to obtain the bamboo recombined material with the same density and different mechanical properties.
(VII) putting the bamboo recombined material of the assembled blank into a prepressing machine at the unit pressure of 1-1.5 MPa/cm2Pre-pressing for 30-45 min, and then putting the material into hot pressing to start hot pressing, wherein the hot pressing temperature is as follows: 135-150 ℃ and the unit pressure of 4.0-6.0 MPa/cm2And (4) hot pressing for 80-120 min, and unloading the plate after the hot pressing is finished for curing.
The invention has the beneficial effects that:
1) the density of the cross section of the bamboo material is gradually reduced from outside to inside, so that the bamboo materials of the green bamboo part and the yellow bamboo part have larger mechanical strength difference, in order to improve the uniformity of the performance of unit materials, the bamboo recombined material with uniform density is prepared. The invention utilizes the mechanical characteristic that the mechanical strength of the cross section of the bamboo wall is gradually weakened from the outer side to the inner side to divide the bamboo wall from the outer side to the inner side in a grading way from the cross section to form a bamboo green layer, a middle layer and bamboo chips of a tabasheer layer, and then the bamboo green layer, the middle layer and the bamboo chips are respectively separated into bamboo bundle units to be used as production raw materials of the bamboo recombined material, thereby greatly improving the utilization rate of the bamboo.
2) In the process of laying the recombined bamboo materials, the bionic structure of bamboo and the theory of a composite material laminated board are utilized for laying, namely, bamboo bundles of a green layer and a middle layer with excellent mechanical strength are placed on the outermost layer, bamboo bundles of a middle layer are placed on the subsurface layer, and bamboo bundles of a yellow layer with the lowest mechanical property are placed in the middle.
3) The method can prepare the bamboo recombined material product meeting the mechanical property of the bamboo recombined material by adjusting the mass percentages of the bamboo outer layer bamboo bundle, the middle layer bamboo bundle and the bamboo inner layer bamboo bundle in the whole plate blank according to the requirements of practical application, and realizes the purpose of controllable preparation of the mechanical property of the bamboo recombined material.
Drawings
Fig. 1 is a schematic view of a bamboo material taken along a cross section thereof.
FIG. 2 is a schematic view of a ply structure of a bamboo recombined material.
In the attached drawings, 1 and 5 are bamboo bundles of green layer, 2 and 4 are bamboo bundles of middle layer, and 3 is bamboo bundle of yellow layer.
Detailed Description
The technical solution of the present invention is further explained with reference to the accompanying drawings.
Referring to the attached figure 1, the preparation method of the bamboo recombined material with the bamboo bionic structure comprises the following steps:
firstly, cutting a fresh bamboo tube into bamboo chips with the width of 6-8 cm, removing bamboo green and tabasheer, and then carrying out grading and splitting along the cross section of the bamboo wall from outside to inside to sequentially form a bamboo green layer, a middle layer and a tabasheer layer bamboo chip; the thickness of the split bamboo green layer bamboo chips is 1.5-2.5 mm, the thickness of the middle layer bamboo chips is 2.0-4.0 mm, and the rest part is the tabasheer layer bamboo chips with the thickness of 3.0-5.0 mm.
Respectively carrying out mechanical defibering treatment on the bamboo green layer, the middle layer and the tabasheer layer bamboo chips prepared in the step one, wherein the bamboo green layer is prepared into bamboo bundles with the bamboo green layer and the fiber fineness of 1-2 mm through adjusting the defibering process; the middle layer is prepared into a middle layer bamboo bundle with the fiber fineness of 800-1000 microns through the adjustment and defibering process; the tabasheer layer is prepared into tabasheer layer bamboo bundles with the fiber fineness of 500-800 microns through the adjustment and fluffing process. And respectively putting the prepared bamboo bundles of the outer layer of bamboo, the bamboo bundles of the middle layer and the bamboo bundles of the inner layer into different drying chambers, and drying at about 102 ℃ for 24 hours.
And (III) putting the dried bamboo bundles of the bamboo green layer, the bamboo bundles of the middle layer and the bamboo bundles of the bamboo yellow layer into iron frames respectively for impregnation treatment, wherein the adhesive is phenolic resin, the impregnation time of the bamboo bundles of the bamboo green layer is 10-15 min, the impregnation time of the bamboo bundles of the middle layer is 12-18 min, and the impregnation time of the bamboo bundles of the bamboo yellow layer is 18-25 min.
And (IV) respectively putting the dipped bamboo green layer bamboo bundles, the middle layer bamboo bundles and the bamboo yellow layer bamboo bundles into a drying chamber, and drying at 60-80 ℃ until the water content is 12-16%.
And (VI) respectively adjusting the mass proportions of the bamboo green layer, the middle layer and the tabasheer layer bamboo bundles according to the layering sequence of the step (five) and the requirements of the mechanical properties of the bamboo recombined material, so as to obtain the bamboo recombined material with the same density and different mechanical properties.
(VII) putting the bamboo recombined material of the assembled blank into a prepressing machine at the unit pressure of 1-1.5 MPa/cm2Pre-pressing for 30-45 min, and then putting the material into hot pressing to start hot pressing, wherein the hot pressing temperature is as follows: 135-150 ℃ and the unit pressure of 4.0-6.0 MPa/cm2And (4) hot pressing for 80-120 min, and unloading the plate after the hot pressing is finished for curing.
The thicknesses of the bamboo green layer bamboo chips, the middle layer bamboo chips and the bamboo yellow layer bamboo chips in the step (I) can be adjusted according to bamboo walls with different thicknesses, and the adjustment proportion of the bamboo green layer bamboo chips, the middle layer bamboo chips and the bamboo yellow layer bamboo chips is 30% -50% -20%.
In the step (II), the fiber fineness of the bamboo bundles of the green layer, the middle layer and the yellow layer is set as follows: the bamboo bundle of the green layer, the bamboo bundle of the middle layer and the bamboo bundle of the yellow layer;
the phenolic resin for impregnation used in the step (III) is 35-42% of the solid content of the phenolic resin for impregnating the bamboo bundles of the bamboo green layer, 48-52% of the solid content of the phenolic resin for impregnating the bamboo bundles of the middle layer and the bamboo yellow layer, and the impregnation time is set as: the bamboo bundles in the green layer are smaller than the bamboo bundles in the middle layer and the bamboo bundles in the yellow layer.
In the step (VI), the mass percentages of the bamboo green layer bamboo bundles, the middle layer bamboo bundles and the bamboo yellow layer bamboo bundles in the whole plate blank can be adjusted according to the requirements of practical application, so that the bamboo recombined material product meeting the mechanical property of the bamboo recombined material is prepared, and the aim of controllably preparing the mechanical property of the bamboo recombined material is fulfilled.
The present invention is further illustrated by the following examples, which are merely exemplary of the present invention in testing and which are not to be construed as limiting the scope of the invention in any way.
Example 1
A preparation method of a bamboo recombined material (with the thickness of 18 mm) with a bamboo bionic structure comprises the following steps:
firstly, cutting a fresh moso bamboo tube into bamboo chips with the width of 6 cm, removing bamboo green and bamboo yellow, and then carrying out grading and subdivision along the cross section of the bamboo wall from outside to inside to sequentially form bamboo green layer, middle layer and bamboo yellow layer bamboo chips. The thickness of the split bamboo green layer bamboo chips is 3 mm, the thickness of the middle layer bamboo chips is 5mm, and the thickness of the tabasheer layer bamboo chips is 2 mm.
Respectively mechanically defibering the bamboo green layer, the middle layer and the tabasheer layer bamboo chips prepared in the step one, wherein the bamboo green layer is prepared into bamboo bundles with the bamboo green layer and the fiber fineness of 2mm by adjusting the defibering process; the middle layer is prepared into a middle layer bamboo bundle with the fiber fineness of 1mm by adjusting the defibering process; the tabasheer layer is prepared into tabasheer layer bamboo bundles with the fiber fineness of 800 microns by adjusting the defibering process. Drying the prepared bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer in different drying chambers at about 102 ℃, wherein the drying time of the bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer is 16h, 20h and 24h respectively.
And (III) putting the dried bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer into iron frames respectively for dipping treatment, wherein the adhesive is phenolic resin. The gum dipping time of the bamboo green layer bamboo bundle is 15 min, and the solid content of the used phenolic resin is 40%; the gum dipping time of the middle layer bamboo bundle is 18 min, and the solid content of the used phenolic resin is 50%; the gum dipping time of the tabasheer layer bamboo bundle is 25 min, and the solid content of the used phenolic resin is 50%.
And (IV) respectively putting the impregnated bamboo bundles of the green layer, the middle layer and the yellow layer into a drying chamber, and drying at 80 ℃ until the water content is 12-16%.
And (V) paving the bamboo recombined material sequentially comprises a bamboo green layer bamboo bundle (1), a middle layer bamboo bundle (2), a bamboo yellow layer bamboo bundle (3), a middle layer bamboo bundle (4) and a bamboo green layer bamboo bundle (5) from top to bottom. The total amount of bamboo unit materials used in the pavement is 65kg, wherein the layer of the bamboo bundle (1) and the layer of the bamboo bundle (5) of the green layer are 6.5kg respectively, the layer of the bamboo bundle (2) and the layer of the bamboo bundle (4) of the middle layer are 19.5kg respectively, and the layer of the bamboo bundle (3) of the yellow layer is 12 kg.
Putting the bamboo recombined material of the assembled blank into a prepressing machine, prepressing for 30 min under the unit pressure of 1.0 MPa/cm2, then putting the bamboo recombined material into a hot press, and starting hot pressing at the hot pressing temperature: and (3) carrying out hot pressing at 145 ℃, wherein the unit pressure is 4.5 MPa/cm2, the hot pressing time is 90 min, and unloading and curing after the hot pressing is finished.
Example 2
A preparation method of a bamboo recombined material (with the thickness of 18 mm) with a bamboo bionic structure comprises the following steps:
firstly, cutting a fresh moso bamboo tube into bamboo chips with the width of 6 cm, removing bamboo green and bamboo yellow, and then carrying out grading and subdivision along the cross section of the bamboo wall from outside to inside to sequentially form bamboo green layer, middle layer and bamboo yellow layer bamboo chips. The thickness of the split bamboo green layer bamboo chips is 3 mm, the thickness of the middle layer bamboo chips is 5mm, and the thickness of the tabasheer layer bamboo chips is 2 mm.
Respectively mechanically defibering the bamboo green layer, the middle layer and the tabasheer layer bamboo chips prepared in the step one, wherein the bamboo green layer is prepared into bamboo bundles with the fiber fineness of 1.5mm through adjusting the defibering process; the middle layer is prepared into middle layer bamboo bundles with the fiber fineness of 800 microns by adjusting the defibering process; the tabasheer layer is prepared into tabasheer layer bamboo bundles with the fiber fineness of 500 microns by adjusting the defibering process. Drying the prepared bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer in different drying chambers at about 102 ℃, wherein the drying time of the bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer is 14h, 18h and 20h respectively.
And (III) putting the dried bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer into iron frames respectively for dipping treatment, wherein the adhesive is phenolic resin. The gum dipping time of the bamboo green layer bamboo bundle is 13 min, and the solid content of the used phenolic resin is 40%; the gum dipping time of the middle layer bamboo bundle is 16 min, and the solid content of the used phenolic resin is 51.6%; the gum dipping time of the tabasheer layer bamboo bundle is 22 min, and the solid content of the used phenolic resin is 47.5 percent.
And (IV) respectively putting the impregnated bamboo bundles of the green layer, the middle layer and the yellow layer into a drying chamber, and drying at 80 ℃ until the water content is 14.3%.
And (V) paving the bamboo recombined material sequentially comprises a bamboo green layer bamboo bundle (1), a middle layer bamboo bundle (2), a bamboo yellow layer bamboo bundle (3), a middle layer bamboo bundle (4) and a bamboo green layer bamboo bundle (5) from top to bottom. The total amount of bamboo unit materials used in the pavement is 65kg, wherein the layer of the bamboo bundle (1) and the layer of the bamboo green layer are respectively 13kg, the layer of the bamboo bundle (2) and the layer of the bamboo 4 of the middle layer are respectively 13kg, and the layer of the bamboo bundle (3) of the bamboo yellow layer is 13 kg.
Putting the bamboo recombined material of the assembled blank into a prepressing machine, prepressing for 35 min under the unit pressure of 1.2 MPa/cm2, then putting the bamboo recombined material into a hot press, and starting hot pressing at the hot pressing temperature: and (3) carrying out hot pressing at 145 ℃, wherein the unit pressure is 5.1 MPa/cm2, the hot pressing time is 95.9 min, and unloading the plate after the hot pressing is finished for curing.
Example 3
A preparation method of a bamboo recombined material (with the thickness of 18 mm) with a bamboo bionic structure comprises the following steps:
firstly, cutting a fresh moso bamboo tube into bamboo chips with the width of 6 cm, removing bamboo green and bamboo yellow, and then carrying out grading and subdivision along the cross section of the bamboo wall from outside to inside to sequentially form bamboo green layer, middle layer and bamboo yellow layer bamboo chips. The thickness of the split bamboo green layer bamboo chips is 3 mm, the thickness of the middle layer bamboo chips is 5mm, and the thickness of the tabasheer layer bamboo chips is 2 mm.
Respectively mechanically defibering the bamboo green layer, the middle layer and the tabasheer layer bamboo chips prepared in the step one, wherein the bamboo green layer is prepared into bamboo bundles with the bamboo green layer and the fiber fineness of 1mm by adjusting the defibering process; the middle layer is prepared into middle layer bamboo bundles with the fiber fineness of 800 microns by adjusting the defibering process; the tabasheer layer is prepared into tabasheer layer bamboo bundles with the fiber fineness of 500 microns by adjusting the defibering process. Drying the prepared bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer in different drying chambers at about 102 ℃, wherein the drying time of the bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer is 14h, 18h and 20h respectively.
And (III) putting the dried bamboo bundles of the green layer, the bamboo bundles of the middle layer and the bamboo bundles of the yellow layer into iron frames respectively for dipping treatment, wherein the adhesive is phenolic resin. The gum dipping time of the bamboo green layer bamboo bundle is 13 min, and the solid content of the used phenolic resin is 40%; the gum dipping time of the middle layer bamboo bundle is 16 min, and the solid content of the used phenolic resin is 50%; the gum dipping time of the tabasheer layer bamboo bundle is 20 min, and the solid content of the used phenolic resin is 50%.
And (IV) respectively putting the impregnated bamboo bundles of the green layer, the middle layer and the yellow layer into a drying chamber, and drying at 80 ℃ until the water content is 12-16%.
And (V) paving the bamboo recombined material sequentially comprises a bamboo green layer bamboo bundle (1), a middle layer bamboo bundle (2), a bamboo yellow layer bamboo bundle (3), a middle layer bamboo bundle (4) and a bamboo green layer bamboo bundle (5) from top to bottom. The total amount of bamboo unit materials used in the pavement is 65kg, wherein the layer of the bamboo bundle (1) and the layer of the bamboo bundle (5) of the green layer are respectively 19.5kg, the layer of the bamboo bundle (2) and the layer of the bamboo bundle (4) of the middle layer are respectively 9.75kg, and the layer of the bamboo bundle (3) of the yellow layer is 6.5 kg.
Putting the bamboo recombined material of the assembled blank into a prepressing machine, prepressing for 40 min under the unit pressure of 1.5 MPa/cm2, then putting the bamboo recombined material into a hot press, and starting hot pressing at the hot pressing temperature: and (3) at 150 ℃, the unit pressure is 5.5 MPa/cm2, the hot pressing time is 95 min, and the board is removed and the board is cured after the hot pressing is finished.
Comparison table for main mechanical strength of bamboo recombined material
Claims (3)
1. A high-strength bamboo recombined material with a bamboo bionic structure is characterized by comprising a first bamboo green layer bamboo bundle, a second middle layer bamboo bundle, a third bamboo yellow layer bamboo bundle, a fourth middle layer bamboo bundle and a fifth bamboo green layer bamboo bundle from top to bottom, wherein the five bamboo bundles are fixedly connected by gluing; the first green layer bamboo bundle and the fifth green layer bamboo bundle are outermost layers with the thickness of 1.5-2.5 mm after green and yellow bamboos of bamboo chips are removed; the second middle layer bamboo bundle and the fourth middle layer bamboo bundle are formed by removing bamboo green and bamboo yellow from bamboo chips, are adjacent to the outermost bamboo chips with the thickness of 1.5-2.5 mm, and are 2.0-4.0 mm; the tabasheer layer bamboo bundle is formed by removing green bamboos and tabasheers from bamboo chips, and is close to the tabasheer part, and the thickness of the tabasheer layer bamboo bundle is about 3.0-5.0 mm; all bamboo chips are prepared into bamboo bundles through mechanical disintegration.
2. The high-strength bamboo recombined material with the bamboo bionic structure as claimed in claim 1, wherein the first bamboo green layer bamboo bundle and the fifth bamboo green layer bamboo bundle respectively account for 10-30% of the slab by mass; the second middle layer bamboo bundle and the fourth middle layer bamboo bundle respectively account for 15-30% of the slab by mass; the third tabasheer layer bamboo bundle layer plate blank accounts for 10-40% of the mass composition.
3. The preparation method of the high-strength bamboo recombined material with the bamboo bionic structure as claimed in claim 1 or 2, which is characterized by comprising the following steps:
firstly, cutting a fresh bamboo tube into bamboo chips with the width of 6-8 cm, removing bamboo green and tabasheer, and then carrying out grading and splitting along the cross section of the bamboo wall from outside to inside to sequentially form a bamboo green layer, a middle layer and a tabasheer layer bamboo chip; setting the thickness of the split bamboo green layer bamboo chips to be 1.5-2.5 mm, the thickness of the middle layer bamboo chips to be 2.0-4.0 mm, and the rest part to be bamboo yellow layer bamboo chips with the thickness of 3.0-5.0 mm;
respectively carrying out mechanical defibering treatment on the bamboo green layer, the middle layer and the tabasheer layer bamboo chips prepared in the step one, wherein the bamboo green layer is prepared into bamboo bundles with the bamboo green layer and the fiber fineness of 1-2 mm through adjusting the defibering process; the middle layer is prepared into a middle layer bamboo bundle with the fiber fineness of 800-1000 microns through the adjustment and defibering process; the tabasheer layer is prepared into tabasheer layer bamboo bundles with the fiber fineness of 500-800 microns through the adjustment and fluffing process; drying the prepared bamboo bundles of the outer layer, the middle layer and the bamboo bundles of the tabasheer layer in different drying chambers at about 102 ℃ for 24 hours;
thirdly, putting the dried bamboo bundles of the green layer, the middle layer and the bamboo bundles of the yellow layer into an iron frame respectively for impregnation treatment, wherein the adhesive is phenolic resin, the impregnation time of the bamboo bundles of the green layer is 10-15 min, the impregnation time of the bamboo bundles of the middle layer is 12-18 min, and the impregnation time of the bamboo bundles of the yellow layer is 18-25 min;
(IV) respectively putting the dipped bamboo green layer bamboo bundles, the middle layer bamboo bundles and the bamboo yellow layer bamboo bundles into a drying chamber, and drying at 60-80 ℃ until the water content is 12-16%;
fifthly, paving the bamboo recombined material from top to bottom sequentially to form a bamboo green layer bamboo bundle (1), a middle layer bamboo bundle (2), a tabasheer layer bamboo bundle (3), a middle layer bamboo bundle (4) and a bamboo green layer bamboo bundle (5);
sixthly, respectively adjusting the mass proportions of the bamboo green layer, the middle layer and the tabasheer layer bamboo bundles according to the layering sequence of the step (five) according to the requirement of the mechanical property of the bamboo recombined material, and thus obtaining the bamboo recombined material with the same density and different mechanical properties;
(VII) putting the bamboo recombined material of the assembled blank into a prepressing machine at the unit pressure of 1-1.5 MPa/cm2Pre-pressing for 30-45 min, and then putting the material into hot pressing to start hot pressing, wherein the hot pressing temperature is as follows: 135-150 ℃ and the unit pressure of 4.0-6.0 MPa/cm2And (4) hot pressing for 80-120 min, and unloading the plate after the hot pressing is finished for curing.
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| CN114407160A (en) * | 2021-11-29 | 2022-04-29 | 浙江省林业科学研究院 | Preparation method of bamboo chip homogenized bamboo tableware |
| CN115464731A (en) * | 2022-09-13 | 2022-12-13 | 浙江省林业科学研究院 | Preparation method of weather-resistant bamboo structural material |
| CN116277348A (en) * | 2023-03-21 | 2023-06-23 | 国际竹藤中心 | Thin bamboo bundle fiber laminated timber and preparation method thereof |
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Application publication date: 20210813 |