CN114888919B - Manufacturing method of bamboo-wood composite board capable of recycling waste materials and bamboo-wood composite board - Google Patents
Manufacturing method of bamboo-wood composite board capable of recycling waste materials and bamboo-wood composite board Download PDFInfo
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- CN114888919B CN114888919B CN202210489292.4A CN202210489292A CN114888919B CN 114888919 B CN114888919 B CN 114888919B CN 202210489292 A CN202210489292 A CN 202210489292A CN 114888919 B CN114888919 B CN 114888919B
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- 239000002131 composite material Substances 0.000 title claims abstract description 77
- 239000002023 wood Substances 0.000 title claims abstract description 54
- 239000002699 waste material Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000004064 recycling Methods 0.000 title claims abstract description 15
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 92
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 92
- 241001330002 Bambuseae Species 0.000 claims abstract description 92
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 92
- 239000011425 bamboo Substances 0.000 claims abstract description 92
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 76
- 238000001035 drying Methods 0.000 claims abstract description 59
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 33
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 26
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000853 adhesive Substances 0.000 claims abstract description 23
- 230000001070 adhesive effect Effects 0.000 claims abstract description 23
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 21
- 239000005011 phenolic resin Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 18
- 229920002522 Wood fibre Polymers 0.000 claims abstract description 17
- 239000002025 wood fiber Substances 0.000 claims abstract description 17
- DVEKCXOJTLDBFE-UHFFFAOYSA-N n-dodecyl-n,n-dimethylglycinate Chemical compound CCCCCCCCCCCC[N+](C)(C)CC([O-])=O DVEKCXOJTLDBFE-UHFFFAOYSA-N 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 14
- 238000002791 soaking Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000007613 environmental effect Effects 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000005507 spraying Methods 0.000 claims abstract description 10
- 239000002916 wood waste Substances 0.000 claims abstract description 3
- 238000007731 hot pressing Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 5
- 229920002488 Hemicellulose Polymers 0.000 claims description 4
- 210000002421 cell wall Anatomy 0.000 claims description 4
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- 238000010981 drying operation Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011120 plywood Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
-
- 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
-
- 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
- B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
-
- 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
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/78—Recycling of wood or furniture waste
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a manufacturing method of a bamboo-wood composite board for recycling waste, which comprises the following steps: crushing the recovered bamboo and wood waste, and screening to obtain crushed aggregates; slicing the green bamboo chips, drying, soaking in a calcium chloride solution, adding dodecyl dimethyl betaine, performing ultrasonic treatment for 20-40min, draining, adding a sodium carbonate solution, performing ultrasonic treatment for 1-2h, filtering, and drying at 50-70 ℃ until the weight is constant to obtain calcium carbonate composite green bamboo chips; uniformly mixing the calcium carbonate composite bamboo green sheets, the wood fibers and the crushed aggregates, adding the mixture into a drying oven, and drying until the water content of the system is 8-10%, wherein the environmental parameters in the drying oven are that the temperature is 100 ℃ and the humidity is 60-70%, thus obtaining a drying material; spraying phenolic resin adhesive into the dried material, uniformly mixing, and then directionally paving to obtain a prefabricated plate; and performing program hot pressing on the prefabricated plate, and cooling to room temperature to obtain the bamboo-wood composite plate. The invention also discloses a bamboo-wood composite board.
Description
Technical Field
The invention relates to the technical field of bamboo-wood composite boards, in particular to a manufacturing method of a bamboo-wood composite board for recycling waste materials and the bamboo-wood composite board.
Background
Due to the lack of forest resources in China and the accompanying natural forest protection engineering carried out in recent years, the supply and demand of wood are increasingly tense, and the large-scale use of wood as engineering materials is difficult to realize at present. The bamboo wood is taken as a special resource in China, has the characteristics of wide distribution range, short growth period, excellent mechanical property and the like, can realize one-time forestation and perpetual utilization, and becomes an optimal raw material for filling the shortage of wood resources in China.
The prior bamboo structural materials mainly comprise bamboo curtain plywood, bamboo mat plywood, bamboo-wood composite board, bamboo skin laminated timber, bamboo shaving board, recombined bamboo and the like. Compared with wood, the bamboo-wood composite board has the characteristics of high strength, high rigidity, good toughness, stable size and the like, and can better meet the use requirements of engineering structural materials.
At present, the general bamboo green sheets of the bamboo-wood composite board are used as raw materials, and the board prepared by parallel assembly hot-pressing gluing has excellent, uniform and stable performance, and can be used as engineering materials in the fields of construction, bridges, transportation, wind power blades and the like. The conventional treatment method of the waste materials such as the cut edge materials, the waste plates and the used common plywood is to use the waste materials as fuel or change the waste materials into other low-value boards, the value of the waste materials is very low, the application range of the waste materials is limited, and the raw material resources are extremely wasted.
In the present and future of increasingly worsened environment, sharply reduced forest resources and increasingly tense wood resource supply, how to efficiently utilize the bamboo wood, the trimming materials and the waste plates, and on the basis of improving the stretching and bending properties of the composite plate, the impact strength of the bamboo-wood composite plate is increased, so that the composite plate has excellent research prospect.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a manufacturing method of a bamboo-wood composite board for recycling waste and a bamboo-wood composite board.
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
s1, crushing the recovered bamboo and wood waste, and screening to obtain crushed aggregates;
S2, slicing the green bamboo chips, drying, soaking in a calcium chloride solution, adding dodecyl dimethyl betaine, performing ultrasonic treatment for 20-40min, draining, adding a sodium carbonate solution, performing ultrasonic treatment for 1-2h, filtering, and drying at 50-70 ℃ until the weight is constant to obtain calcium carbonate composite green bamboo chips;
S3, uniformly mixing the calcium carbonate composite bamboo green sheets, the wood fibers and the crushed aggregates, adding the mixture into a drying oven, and drying the mixture until the water content of the system is 8-10%, wherein the environmental parameters in the drying oven are that the temperature is 100 ℃ and the humidity is 60-70%, thus obtaining a drying material; spraying phenolic resin adhesive into the dried material, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
and S4, performing program hot pressing on the prefabricated plate, and cooling to room temperature to obtain the bamboo-wood composite plate.
Preferably, the recovered bamboo waste is rim charge and/or waste board generated in the production of the bamboo composite board
Preferably, the particle size of the particles obtained in S1 is 1-5mm.
Preferably, in S2, the specific drying operation is as follows: and (5) drying the sliced bamboo green slices in an oven at 70-80 ℃ for 10-30min.
Preferably, in S2, the concentration of the calcium chloride solution is 0.5-1.5mol/L, the concentration of the sodium carbonate solution is 0.5-1.5mol/L,
Preferably, in S2, the mass ratio of the green bamboo chips to the calcium chloride solution to the dodecyl dimethyl betaine to the sodium carbonate solution is 10-20:50-100:1-2:50-100.
Preferably, in S2, the filter is followed by washing with clean water.
Preferably, in S3, the mass ratio of the calcium carbonate composite bamboo green sheets, the wood fibers, the crushed aggregates and the phenolic resin adhesive is 50-100:15-25:10-30:10-30.
Preferably, in S4, the procedure hot pressing specifically operates as follows: setting the pressure to be 2-4MPa, and hot-pressing for 5-10min at 105-115 ℃; increasing the pressure to 5-7MPa, and continuously hot-pressing at 105-115 ℃ for 10-15min; the pressure is reduced to 1.5-2.5MPa, and the mixture is kept stand for 1-2h at room temperature; the pressure is increased to 3-5MPa, and the hot pressing is carried out for 2-4min at 120-130 ℃.
The bamboo-wood composite board is manufactured by adopting the manufacturing method of the bamboo-wood composite board with the waste recycled.
The technical effects of the invention are as follows:
Drying the green bamboo chips at 70-80 ℃ to form fine longitudinal grooves in the green bamboo chips after flaking, discharging internal gas to form a large number of fine pore structures, soaking the green bamboo chips into a calcium chloride solution to facilitate the permeation of an ion solution, wherein calcium ions fully permeate into the structures of the green bamboo chips, soaking the green bamboo chips into a sodium carbonate solution, and combining the calcium ions in the green bamboo chips with carbonate ions under the action of ultrasound to form calcium carbonate molecules in the green bamboo chip structures; the nano calcium carbonate is combined with pores, cracks, grooves and defects among the bamboo green sheet fibers, so that the surface roughness of the bamboo green sheet is effectively reduced, and meanwhile, when the bamboo green sheet is stressed, the crack can be effectively prevented from expanding and deforming, the stress load can be effectively transferred, and the mechanical property of the bamboo green sheet is effectively enhanced.
The dodecyl dimethyl betaine can effectively reduce the surface energy of calcium carbonate, effectively reduce acting force among calcium carbonate molecules, effectively prevent calcium carbonate ions from agglomerating, and form a salt film with calcium ions exposed outside the calcium carbonate ions; the dodecyl dimethyl betaine on the surface of the calcium carbonate composite bamboo green sheet is further reacted with phenolic resin in the hot pressing process, the phenolic resin adhesive is promoted to enter the cell wall of the bamboo green sheet by controlling the pressure and temperature change, and cellulose, hemicellulose and the like contain a large amount of hydroxyl groups, so that the bamboo green sheet, activated calcium carbonate and phenolic resin are further promoted to form a space interweaved structure by the hydrogen bond and association balance effect, the bamboo green sheet, wood fiber and crushed aggregates form an integral structure, the bonding force among the bamboo green sheet, the wood fiber and the crushed aggregates is strong, the bonding strength is high, and the tensile strength and the bending strength of the bamboo-wood composite board are excellent.
The waste material generated in the preparation process of the bamboo-wood composite board is used as one of the raw materials, so that the utilization rate of bamboo is improved, the obtained board has good tensile strength and bending strength, and meanwhile, in the hot-pressing stage, the dimensional stability of the board is further improved by adopting a program pressurizing-pressure releasing mode.
Drawings
FIG. 1 is a graph showing the comparison of the internal bonding strength of the bamboo-wood composite panels obtained in example 5 and comparative examples 1-2.
FIG. 2 is a graph showing the static bending strength and the elastic modulus of the bamboo-wood composite panels obtained in example 5 and comparative examples 1-2.
FIG. 3 is a graph showing the comparison of the 24-hour water absorption thickness expansion rate of the bamboo-wood composite panels obtained in example 5 and comparative examples 1-2.
Detailed Description
The invention is further illustrated below in connection with specific embodiments.
Example 1
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
S1, crushing the rim charge and the waste board by using a hammer crusher, and screening to obtain crushed aggregates with the particle size of 1-5mm;
S2, slicing 10kg of green bamboo slices into the following sizes: adding the mixture into a 70 ℃ oven for drying for 10min, then soaking the mixture into 50kg of calcium chloride solution with the concentration of 0.5mol/L, adding 1kg of dodecyl dimethyl betaine, carrying out ultrasonic treatment for 20min, draining, adding 50kg of sodium carbonate solution with the concentration of 0.5mol/L into the mixture, carrying out ultrasonic treatment for 1h, filtering, washing for 2 times, and drying the mixture at the temperature of 50 ℃ until the weight is constant to obtain the calcium carbonate composite green bamboo chips;
s3, uniformly mixing 50kg of calcium carbonate composite bamboo green sheets, 15kg of wood fibers and 10kg of crushed aggregates, and adding into a drying box for drying until the water content of the system is 8%, wherein the environmental parameters in the drying box are that the temperature is 100 ℃ and the humidity is 60%, so as to obtain a drying material; spraying 10kg of phenolic resin adhesive into the dried material by adopting a spray type wet adhesive method, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
S4, feeding the prefabricated plate into a hot press, and hot-pressing for 5min at 105 ℃ under the set pressure of 2 MPa; increasing the pressure to 5MPa, and continuously hot-pressing at 105 ℃ for 10min; the pressure is reduced to 1.5MPa, and the mixture is stood for 1h at room temperature; increasing the pressure to 3MPa, and hot-pressing at 120 ℃ for 2min; cooling to room temperature, and removing burrs to obtain the bamboo-wood composite board.
Example 2
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
S1, crushing the rim charge and the waste board by using a hammer crusher, and screening to obtain crushed aggregates with the particle size of 1-5mm;
S2, planing 20kg of green bamboo chips into the following sizes: adding the mixture into an oven with the temperature of 80 ℃ for drying for 30min, then soaking the mixture into 100kg of calcium chloride solution with the concentration of 1.5mol/L, adding 2kg of dodecyl dimethyl betaine, carrying out ultrasonic treatment for 40min, draining, adding 100kg of sodium carbonate solution with the concentration of 1.5mol/L into the mixture, carrying out ultrasonic treatment for 2h, filtering, washing for 4 times, and drying the mixture at the temperature of 70 ℃ until the weight is constant to obtain the calcium carbonate composite green bamboo chips, wherein the length of the calcium carbonate composite green bamboo chips is 50-60mm, the width of the calcium carbonate composite green bamboo chips is 5-10mm, and the thickness of the calcium carbonate composite green bamboo chips is 0.45-0.55 mm;
S3, uniformly mixing 100kg of calcium carbonate composite bamboo green sheets, 25kg of wood fibers and 30kg of crushed aggregates, and adding into a drying box for drying until the water content of the system is 10%, wherein the environmental parameters in the drying box are that the temperature is 100 ℃ and the humidity is 70%, so as to obtain a drying material; spraying 30kg of phenolic resin adhesive into the dried material by adopting a spray type wet adhesive method, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
S4, feeding the prefabricated plate into a hot press, and hot-pressing for 10min at 115 ℃ under the set pressure of 4 MPa; the pressure is increased to 7MPa, and hot pressing is continued for 15min at 115 ℃; the pressure is reduced to 2.5MPa, and the mixture is kept stand for 2 hours at room temperature; increasing the pressure to 5MPa, and hot-pressing at 130 ℃ for 4min; cooling to room temperature, and removing burrs to obtain the bamboo-wood composite board.
Example 3
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
S1, crushing the rim charge and the waste board by using a hammer crusher, and screening to obtain crushed aggregates with the particle size of 1-5mm;
s2, slicing 13kg of green bamboo slices into the following sizes: adding the mixture into a 77 ℃ oven for drying for 15min, then soaking the mixture into 90kg of calcium chloride solution with the concentration of 0.8mol/L, adding 1.7kg of dodecyl dimethyl betaine, carrying out ultrasonic treatment for 25min, draining, adding 80kg of sodium carbonate solution with the concentration of 0.8mol/L into the mixture, carrying out ultrasonic treatment for 1.7h, filtering, washing for 3 times, and drying the mixture at 55 ℃ until the weight is constant to obtain the calcium carbonate composite green bamboo chips;
S3, uniformly mixing 90kg of calcium carbonate composite bamboo green sheets, 18kg of wood fibers and 25kg of crushed aggregates, and adding into a drying oven for drying until the water content of the system is 8.5%, wherein the environmental parameters in the drying oven are that the temperature is 100 ℃ and the humidity is 68%, so as to obtain a drying material; spraying 15kg of phenolic resin adhesive into the dried material by adopting a spray type wet adhesive method, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
S4, feeding the prefabricated plate into a hot press, and hot-pressing for 8min at the temperature of 108 ℃ under the pressure of 3.5 MPa; the pressure is increased to 5.5MPa, and the hot pressing is continued for 12min at 112 ℃; the pressure is reduced to 2.2MPa, and the mixture is kept stand for 1.2 hours at room temperature; the pressure is increased to 4.5MPa, and the hot pressing is carried out for 3.5min at 122 ℃; cooling to room temperature, and removing burrs to obtain the bamboo-wood composite board.
Example 4
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
S1, crushing the rim charge and the waste board by using a hammer crusher, and screening to obtain crushed aggregates with the particle size of 1-5mm;
S2, slicing 17kg of green bamboo slices into the following sizes: adding the mixture into a 73 ℃ oven for drying for 25min, then soaking the mixture into 70kg of calcium chloride solution with the concentration of 1.2mol/L, adding 1.3kg of dodecyl dimethyl betaine, carrying out ultrasonic treatment for 35min, draining, adding 60kg of sodium carbonate solution with the concentration of 1.2mol/L, carrying out ultrasonic treatment for 1.3h, filtering, washing for 3 times, and drying the mixture at 65 ℃ until the weight is constant to obtain the calcium carbonate composite green bamboo chips;
S3, uniformly mixing 70kg of calcium carbonate composite bamboo green sheets, 22kg of wood fibers and 15kg of crushed aggregates, and adding into a drying box for drying until the water content of the system is 9.5%, wherein the environmental parameters in the drying box are that the temperature is 100 ℃ and the humidity is 62%, so as to obtain a drying material; spraying 25kg of phenolic resin adhesive into the dried material by adopting a spray type wet adhesive method, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
s4, feeding the prefabricated plate into a hot press, and hot-pressing for 6min at 112 ℃ under the set pressure of 2.5 MPa; the pressure is increased to 6.5MPa, and the hot pressing is continued for 14min at 108 ℃; the pressure is reduced to 1.8MPa, and the mixture is kept stand for 1.6 hours at room temperature; the pressure is increased to 3.5MPa, and the hot pressing is carried out for 2.5min at 128 ℃; cooling to room temperature, and removing burrs to obtain the bamboo-wood composite board.
Example 5
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
S1, crushing the rim charge and the waste board by using a hammer crusher, and screening to obtain crushed aggregates with the particle size of 1-5mm;
S2, planing 15kg of green bamboo chips into the following sizes: adding the mixture into a 75 ℃ oven for drying for 20min, then soaking the mixture into 80kg of calcium chloride solution with the concentration of 1mol/L, adding 1.5kg of dodecyl dimethyl betaine, carrying out ultrasonic treatment for 30min, draining, adding 70kg of sodium carbonate solution with the concentration of 1mol/L, carrying out ultrasonic treatment for 1.5h, filtering, washing for 3 times, and drying at the temperature of 60 ℃ until the weight is constant to obtain the calcium carbonate composite green bamboo chips;
S3, uniformly mixing 80kg of calcium carbonate composite bamboo green sheets, 20kg of wood fibers and 20kg of crushed aggregates, and adding into a drying box to be dried until the water content of the system is 9%, wherein the environmental parameters in the drying box are that the temperature is 100 ℃ and the humidity is 65%, so as to obtain a drying material; spraying 20kg of phenolic resin adhesive into the dried material by adopting a spray type wet adhesive method, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
S4, feeding the prefabricated plate into a hot press, and hot-pressing for 7min at 110 ℃ under the set pressure of 3 MPa; the pressure is increased to 6MPa, and the hot pressing is continued for 13min at 110 ℃; the pressure is reduced to 2MPa, and the mixture is stood for 1.4 hours at room temperature; increasing the pressure to 4MPa, and hot-pressing at 125 ℃ for 3min; cooling to room temperature, and removing burrs to obtain the bamboo-wood composite board.
Comparative example 1
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
S1, crushing the rim charge and the waste board by using a hammer crusher, and screening to obtain crushed aggregates with the particle size of 1-5mm;
s2, planing 80kg of green bamboo chips into the following sizes: adding 20kg of wood fiber and 20kg of crushed aggregates, uniformly mixing, adding into a drying oven, and drying until the water content of the system is 9%, wherein the environmental parameters in the drying oven are that the temperature is 100 ℃ and the humidity is 65%, to obtain a drying material, wherein the length is 50-60mm, the width is 5-10mm, and the thickness is 0.45-0.55 mm; spraying 20kg of phenolic resin adhesive into the dried material by adopting a spray type wet adhesive method, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
S3, feeding the prefabricated plate into a hot press, and hot-pressing for 7min at 110 ℃ under the set pressure of 3 MPa; the pressure is increased to 6MPa, and the hot pressing is continued for 13min at 110 ℃; the pressure is reduced to 2MPa, and the mixture is stood for 1.4 hours at room temperature; increasing the pressure to 4MPa, and hot-pressing at 125 ℃ for 3min; cooling to room temperature, and removing burrs to obtain the bamboo-wood composite board.
Comparative example 2
A manufacturing method of a bamboo-wood composite board for recycling waste materials comprises the following steps:
S1, crushing the rim charge and the waste board by using a hammer crusher, and screening to obtain crushed aggregates with the particle size of 1-5mm;
S2, planing 15kg of green bamboo chips into the following sizes: adding the mixture into a 75 ℃ oven for drying for 20min, then soaking the mixture into 80kg of calcium chloride solution with the concentration of 1mol/L, adding 1.5kg of dodecyl dimethyl betaine, carrying out ultrasonic treatment for 30min, draining, adding 70kg of sodium carbonate solution with the concentration of 1mol/L, carrying out ultrasonic treatment for 1.5h, filtering, washing for 3 times, and drying at the temperature of 60 ℃ until the weight is constant to obtain the calcium carbonate composite green bamboo chips;
S3, uniformly mixing 80kg of calcium carbonate composite bamboo green sheets, 20kg of wood fibers and 20kg of crushed aggregates, and adding into a drying box to be dried until the water content of the system is 9%, wherein the environmental parameters in the drying box are that the temperature is 100 ℃ and the humidity is 65%, so as to obtain a drying material; spraying 20kg of polyurethane adhesive into the dried material by adopting a spray type wet adhesive method, uniformly mixing, and then directionally paving to obtain a prefabricated plate;
S4, feeding the prefabricated plate into a hot press, and hot-pressing for 7min at 110 ℃ under the set pressure of 3 MPa; the pressure is increased to 6MPa, and the hot pressing is continued for 13min at 110 ℃; the pressure is reduced to 2MPa, and the mixture is stood for 1.4 hours at room temperature; increasing the pressure to 4MPa, and hot-pressing at 125 ℃ for 3min; cooling to room temperature, and removing burrs to obtain the bamboo-wood composite board.
The bamboo-wood composite boards (thickness: 20.+ -. 1 mm) obtained in example 5 and comparative examples 1-2 were subjected to comparative performance test under the dry state (temperature: 20 ℃ C., relative humidity: 65%) as follows:
1. The internal bonding strength of each group was tested by referring to GB/T17657-2013 method for testing physicochemical properties of artificial boards and veneered artificial boards, as shown in FIG. 1, the internal bonding strength of the bamboo-wood composite board obtained in example 5 was the highest.
The inventors consider that: the nano calcium carbonate is generated in the pores, cracks, grooves and defects among the bamboo green sheet fibers, so that the surface roughness of the bamboo green sheet is effectively reduced, the crack can be effectively prevented from expanding and deforming when the bamboo green sheet is stressed, the stress load can be effectively transferred, and the mechanical property of the bamboo green sheet is effectively enhanced; and the dodecyl dimethyl betaine on the surface of the calcium carbonate composite bamboo green sheet is further reacted with phenolic resin in the hot pressing process, the phenolic resin adhesive is promoted to enter the cell wall of the bamboo green sheet by controlling the pressure and temperature change, and cellulose, hemicellulose and the like contain a large amount of hydroxyl groups, so that the bamboo green sheet, activated calcium carbonate and phenolic resin are further promoted to form a space interweaved structure through the hydrogen bond and association balance effect, the bamboo green sheet, wood fiber and crushed aggregates form an integral structure, the bonding force among the bamboo green sheet, the wood fiber and the crushed aggregates is strong, and the bonding strength is high.
2. The static bending strength and the elastic modulus (three-point bending) of each group were detected by referring to GB/T17657-2013 method for testing the physical and chemical properties of artificial boards and facing artificial boards, and as shown in FIG. 2, the static bending strength and the elastic modulus strength in the parallel and vertical directions of the bamboo-wood composite board obtained in example 5 were the highest.
The inventors consider that: the nano calcium carbonate is generated in the pores, cracks, grooves and defects among the bamboo green sheet fibers, so that the surface roughness of the bamboo green sheet is effectively reduced, the crack can be effectively prevented from expanding and deforming when the bamboo green sheet is stressed, the stress load can be effectively transferred, and the mechanical property of the bamboo green sheet is effectively enhanced; and the dodecyl dimethyl betaine on the surface of the calcium carbonate composite bamboo green sheet is further reacted with phenolic resin in the hot pressing process, the phenolic resin adhesive is promoted to enter the cell wall of the bamboo green sheet by controlling the pressure and temperature change, and cellulose, hemicellulose and the like contain a large amount of hydroxyl groups, so that the bamboo green sheet, activated calcium carbonate and phenolic resin form a space interweaved structure by further balancing the hydrogen bond and association, and the bamboo green sheet, wood fiber and crushed aggregates form an integral structure, so that the bamboo wood composite board has excellent tensile strength and bending strength.
3. The 24h water absorption thickness expansion rate of each group is detected by referring to GB/T17657-2013 artificial board and decorative artificial board physical and chemical property test method, and as shown in figure 3, the 24h water absorption thickness expansion rate of each group of samples is close.
In summary of the 3 sets of test data, each set of samples was found to meet the relevant index of OSB/2 in LY/T1580-2010 oriented strand board, confirming that the invention is suitable for use as a carrier board in the dry state.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (2)
1. The manufacturing method of the bamboo-wood composite board for recycling the waste is characterized by comprising the following steps of:
s1, crushing the recycled bamboo and wood waste, and screening to obtain crushed aggregates, wherein the particle size of the crushed aggregates is 1-5mm;
S2, slicing the green bamboo chips, drying, soaking in a calcium chloride solution, adding dodecyl dimethyl betaine, performing ultrasonic treatment for 20-40min, draining, adding a sodium carbonate solution, performing ultrasonic treatment for 1-2h, filtering, and drying at 50-70 ℃ until the weight is constant to obtain calcium carbonate composite green bamboo chips; wherein the concentration of the calcium chloride solution is 0.5-1.5mol/L, and the concentration of the sodium carbonate solution is 0.5-1.5mol/L; the mass ratio of the green bamboo chips to the calcium chloride solution to the dodecyl dimethyl betaine to the sodium carbonate solution is 10-20:50-100:1-2:50-100;
S3, uniformly mixing the calcium carbonate composite bamboo green sheets, the wood fibers and the crushed aggregates, adding the mixture into a drying oven, and drying the mixture until the water content of the system is 8-10%, wherein the environmental parameters in the drying oven are that the temperature is 100 ℃ and the humidity is 60-70%, thus obtaining a drying material; spraying phenolic resin adhesive into the dried material, uniformly mixing, and then directionally paving to obtain a prefabricated plate; wherein, the mass ratio of the calcium carbonate composite bamboo green sheets, the wood fibers, the crushed aggregates and the phenolic resin adhesive is 50-100:15-25:10-30:10-30 parts of a base;
s4, performing program hot pressing on the prefabricated plate, and cooling to room temperature to obtain the bamboo-wood composite plate; the specific operation of the program hot pressing is as follows: setting the pressure to be 2-4MPa, and hot-pressing for 5-10min at 105-115 ℃; increasing the pressure to 5-7MPa, and continuously hot-pressing at 105-115 ℃ for 10-15min; the pressure is reduced to 1.5-2.5MPa, and the mixture is kept stand for 1-2h at room temperature; increasing the pressure to 3-5MPa, and hot-pressing at 120-130deg.C for 2-4min;
Calcium carbonate is generated in the gaps, cracks, grooves and defects among the bamboo green sheet fibers, so that the surface roughness of the bamboo green sheet is effectively reduced, and the expansion and deformation of the cracks can be effectively prevented when the bamboo green sheet is stressed; the dodecyl dimethyl betaine on the surface of the calcium carbonate composite bamboo green sheet is further reacted with phenolic resin in the hot pressing process, the phenolic resin adhesive is promoted to enter the cell wall of the bamboo green sheet by controlling the pressure and temperature change, and cellulose, hemicellulose and the like contain a large amount of hydroxyl groups, so that the bamboo green sheet, activated calcium carbonate and phenolic resin form a space interweaved structure by further balancing the hydrogen bond and association;
In S2, the specific drying operation is as follows: drying sliced bamboo green sheets in an oven at 70-80deg.C for 10-30min;
S2, filtering and washing with clear water.
2. The bamboo-wood composite board is characterized in that the bamboo-wood composite board is manufactured by adopting the manufacturing method for recycling the waste material according to claim 1.
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