Composite composition board and production process thereof

Abstract

The invention discloses a composite composition board and a production process thereof, and relates to the technical field of materials. A composite composition board comprises heavy bamboo boards and metal boards, the heavy bamboo boards and the metal boards are arranged in a staggered mode, the heavy bamboo boards and the metal boards are fixedly connected through connecting pieces and adhesive layers, the heavy bamboo boards are made of recombined bamboos, the number of the heavy bamboo boards is at least two, the connecting pieces are arranged in a matrix mode, and through holes are formed in the heavy bamboo boards and / or the metal boards. A plurality of elastomers are arranged in the adhesive layer, and the adhesive layer is coated on the contact surface of the heavy bamboo plate and the metal plate; the production process of the composite composition board comprises the following steps of preparation of the heavy bamboo board, preparation of the metal board, formation of the composition board and surface treatment. The invention breaks through the limitation of the traditional composite material, provides a brand new material combination scheme and production process, and has wide application prospect and market potential.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly relates to a composite combined board and its production process. Background Art

[0002] In the field of modern building and decoration materials, traditional single materials are difficult to meet the diversified requirements for material properties: Wood has low compressive, tensile, and impact resistance strengths, and it is difficult to bear high loads or frequent vibrations; it is vulnerable to humidity, temperature changes, and insect infestation, and is prone to cracking, deformation, or decay after long-term use; high-quality wood resources are limited, and overcutting will cause environmental problems. Metal plates (such as steel plates, aluminum plates) have a high density, resulting in a large overall structure weight, increasing transportation and installation costs; the production process has high energy consumption and is non-renewable, which does not conform to the development trend of green buildings, and has a high thermal conductivity, resulting in poor heat insulation performance and is not suitable for environments that require heat preservation. Plastic composite materials have low mechanical strength and are difficult to meet the requirements of high-load application scenarios; plastics are prone to aging under ultraviolet radiation, and problems such as discoloration and embrittlement will occur after long-term use; plastic materials are difficult to degrade and will cause environmental pollution after being discarded.

[0003] In recent years, bamboo-wood composite materials have received attention as an environmentally friendly material, but there are still the following problems in their actual applications: Insufficient strength and durability: Existing bamboo-wood composite materials mostly use bamboo combined with plastics or fibers, and their strength and durability are difficult to compare with metal materials; in high-temperature and high-humidity environments, the performance of bamboo-wood composite materials will decrease significantly. Complex production process: The existing production process of bamboo-wood composite materials is complex, involving multiple processes such as bamboo treatment, fiber separation, and composite pressing, resulting in high production costs; the complex production process limits their large-scale promotion and application. Existing bamboo-wood composite materials are mostly used in low-load scenarios such as furniture and decorative boards, and it is difficult to meet the high-strength requirements of building structural materials.

[0004] Heavy bamboo material is a high-density material formed by restructuring bamboo through a high-temperature and high-pressure process, and has the following advantages: The compressive strength of heavy bamboo material can reach 100 MPa, approaching the strength of some metal materials; bamboo is a renewable resource with a short growth cycle, which conforms to the development trend of green buildings; the density of heavy bamboo material is low, the overall structure is light, and it is convenient for transportation and installation.

[0005] However, heavy bamboo materials still face the following challenges in actual applications: Insufficient impact resistance: Heavy bamboo materials are prone to cracking or breaking when subjected to strong impacts; Durability problems: When exposed to harsh environments (such as high temperature, high humidity) for a long time, the performance of heavy bamboo materials will gradually decline; How to effectively combine heavy bamboo materials with metal materials to form a composite material with both high strength and durability is still a technical problem. Summary of the Invention

[0006] The purpose of the present invention is to provide a composite composite board and its production process, by staggering heavy bamboo boards and metal boards and doubly fixing them with connecting parts and adhesive layers to form a composite material with high strength and durability, and by simplifying the production process, low-cost and high-efficiency large-scale production can be achieved.

[0007] A composite composite board comprises a heavy bamboo board and a metal board, wherein the heavy bamboo board and the metal board are arranged alternately, and the heavy bamboo board and the metal board are fixedly connected by a connecting piece and an adhesive layer.

[0008] Wherein, the heavy bamboo board is made of reconstituted bamboo and at least two pieces are provided, the metal plate is an aluminum alloy plate or a stainless steel plate, the connecting pieces are arranged in a matrix, the heavy bamboo board and / or the metal plate are provided with through holes, the through holes are adapted to the size of the connecting pieces, a plurality of elastomers are provided in the adhesive layer, and the adhesive layer is coated on the contact surface between the heavy bamboo board and the metal plate.

[0009] The present invention uses heavy bamboo board as the main material, giving full play to its advantages of high strength, light weight and environmental protection, and selects aluminum alloy or stainless steel with high strength and durability as the metal plate, and the combination of the two gives full play to their respective advantages; traditional composite materials mostly use bamboo and wood combined with plastic or fiber, while the present invention combines reconstituted bamboo with metal plates, breaking through the limitations of traditional composite materials and providing a new material combination solution. Traditional adhesives are mostly used for bonding between single materials. The present invention achieves efficient bonding of bamboo and metal by optimizing the selection of adhesives, significantly improving the overall performance of the composite board.

[0010] In the present invention, the heavy bamboo boards and the metal boards are arranged alternately, a metal board is arranged between two adjacent heavy bamboo boards, high-strength bolts or rivets can be selected as connecting parts, and an adhesive layer is coated between the heavy bamboo boards and the metal boards. Through the double fixing structure, the stability and durability of the structure are significantly improved, and a composite composite board with both high strength and durability is obtained. The composite composite board of the present invention can be applied to building structural materials such as walls, floors, roofs, etc., meeting the requirements of high strength, lightness and environmental protection.

[0011] In order to reduce the problem of uneven stress distribution between the heavy bamboo board and the metal plate due to the difference in thickness between the heavy bamboo board and the metal plate when subjected to force, the composite composite board of the present invention can be composed of multiple layers of heavy bamboo board and metal plate, such as a five-layer structure of heavy bamboo board-metal plate-heavy bamboo board-metal plate-heavy bamboo board, and the thickness ratio of the heavy bamboo board and the metal plate is optimized to ensure that stress can be transmitted at a uniform speed and avoid local stress concentration. In addition, a plurality of elastic bodies are arranged between the heavy bamboo board and the metal plate, and the elastic bodies form an elastic transition layer between the heavy bamboo board and the metal plate, which can alleviate the stiffness difference between the two and reduce stress concentration.

[0012] The present invention provides through holes on the heavy bamboo board and / or the metal plate, through which the connecting piece passes and then the metal plate and the heavy bamboo board are fixedly connected by the connecting piece to ensure the tightness of the connection. If the connecting piece is a high-strength bolt, corresponding through holes are arranged in a matrix on both the metal plate and the two heavy bamboo boards on both sides, and the heavy bamboo board and the metal plate are fixedly connected together after the high-strength bolt penetrates through the through holes; if the connecting piece is a rivet, through holes are only opened on the metal plate, and after the rivet passes through the through holes, it pierces into the heavy bamboo board to fixedly connect the metal plate and the heavy bamboo board; or one end of the high-strength bolt is welded on both side surfaces of the metal plate, through holes are opened at the corresponding positions on the heavy bamboo board, and after the high-strength bolt penetrates through the through holes, it is fixed with nuts; or connecting pieces similar to rivets are welded on both side surfaces of the metal plate, and the connecting pieces can directly pierce into the heavy bamboo board to realize the connection between the metal plate and the heavy bamboo board.

[0013] Further, the setting method of the elastomer is as follows: the elastomer is dispersed in the adhesive layer, the diameter of the elastomer is 0.2 - 0.4 mm, the elastomer accounts for 20% - 30% of the volume of the adhesive, and the material of the elastomer includes one or more of EPDM rubber, silicone rubber or polyurethane elastomer.

[0014] The diameter of the elastomer is selected to be 0.2 - 0.4 mm to make the buffering effect obvious. EPDM rubber and silicone rubber have good elasticity and weather resistance, and polyurethane elastomer has excellent elasticity and compressive resistance, which can be used as an elastic transition layer.

[0015] The production process of the composite combined board includes the following steps:

[0016] S100, preparation of the heavy bamboo board: After the bamboo is cut, steamed, dried and other pre-treatments to obtain bamboo sections, the bamboo sections are split into bamboo slices. After the phenolic resin adhesive is coated on the surface of the bamboo slices, the bamboo slices are arranged parallel to the fiber direction and stacked into a blank, which is placed in a hot press and hot-pressed into a high-density heavy bamboo board, and the hot-pressed heavy bamboo board is cut into the required size;

[0017] S200, preparation of the metal plate: The thickness ratio between the metal plate and the heavy bamboo board is 1:1.5 - 2. After the surface of the metal is subjected to anti-corrosion treatment, the cut size is the same as that of the above-mentioned heavy bamboo board, and holes are drilled in a matrix on the surface of the metal plate;

[0018] S300, forming of the combined board: An adhesive with a thickness of 0.2 - 0.5 mm is evenly coated on the contact surface between the heavy bamboo board and the metal plate. The heavy bamboo board and the metal plate are preliminarily fixed by using a fixture, and then the heavy bamboo board and the metal plate are connected and fixed by a connecting piece to ensure that the connecting piece is closely attached to the combined board;

[0019] S400. Surface treatment: Sand and polish the surface of the composite board, coat a polyurethane coating on the surface of the composite board, with the coating thickness being 0.1 - 0.2 mm, and fully cure the coating to obtain a composite composite board.

[0020] The present invention prepares a high - density recombinant bamboo board through processes such as cutting, steaming, drying, and pressing, ensuring its high strength and light weight. Traditional bamboo processing mostly uses simple cutting and drying processes. However, the present invention significantly improves the density and strength of the recombinant bamboo board by optimizing the steaming and pressing processes; improves the weather resistance and service life of the metal plate by optimizing the surface treatment process; realizes the efficient combination of the heavy bamboo board and the metal plate through processes such as gluing, staggered arrangement, fixing with connectors, and surface treatment; reduces the production cost and improves the production efficiency by optimizing the process flow. The present invention improves the durability and environmental protection of the composite board by optimizing material selection and process design, and can be widely applied to fields such as construction, decoration, furniture, and transportation to meet the requirements of materials for different scenarios.

[0021] Further, in step S100, the method for bamboo pretreatment is: Select moso bamboo that is 4 - 6 years old and has a uniform diameter as raw material, cut the bamboo into bamboo segments with a length of 1.5 - 2.0 meters, put the bamboo segments into a steaming tank, steam at 120 - 130 °C for 2 - 3 hours, and put the steamed bamboo segments into a drying kiln, dry at 60 - 70 °C until the moisture content is lower than 12%.

[0022] Further, in step S100, the width of the bamboo slices is 20 - 30 mm, the thickness is 5 - 8 mm, and the bamboo slices with cracks, insect holes, or deformations are screened out and removed.

[0023] Further, in step S100, the method for hot pressing is: Put the blank into a hot press, hot press at 140 - 160 °C and a pressure of 10 - 15 MPa for 30 - 40 minutes to form a high - density recombinant bamboo board; the density of the high - density heavy bamboo board is 1.0 - 1.3 g / cm 3 , the compressive strength is 85 - 100 MPa, and the thickness is 10 - 40 mm.

[0024] Further, in step S200, the method for anti - corrosion treatment of the metal surface includes coating one or both of an anodic oxidation coating or a galvanized coating; the aperture of the drilled holes is 6.2 - 8.5 mm, and the hole spacing is 50 - 100 mm.

[0025] Further, in step S300, the adhesive includes one or several of polyurethane adhesives, epoxy resin adhesives, acrylic adhesives, or EVA adhesives.

[0026] The adhesive of the present invention can not only ensure the bonding strength of the composite panel, but also ensure the durability, weather resistance and environmental protection performance of the composite panel. Select a suitable adhesive according to the application scenario and performance requirements of the composite panel. For scenarios with high requirements for high strength and durability, polyurethane adhesives or epoxy resin adhesives can be selected; for scenarios with high requirements for environmental protection, waterborne polyurethane adhesives can be selected; for scenarios that require rapid curing, acrylic adhesives can be selected; for scenarios with light loads and high elasticity requirements, EVA adhesives can be selected; or one or several adhesives can be used in combination according to specific requirements. The diverse selection can significantly improve the performance and application scope of the heavy bamboo-metal composite panel.

[0027] Further, in step S400, the curing method of the panel is: put the coated panel into a curing chamber and cure it at 60-80 °C for 2-3 h to ensure that the coating is completely cured.

[0028] Advantages of the present invention

[0029] 1. The present invention combines the reconstituted bamboo with the metal plate. Through the dual fixation design, the stability and durability of the structure are significantly improved, and a composite panel with both high strength and durability is obtained. This not only improves the comprehensive performance of the panel, but also expands its application fields, having important economic and social values.

[0030] 2. The production process of the present invention breaks through the limitations of traditional composite materials, provides a new material combination scheme and production process, has broad application prospects and market potential, and can be used for building structural materials such as walls, floors, and roofs to meet the requirements of high strength, light weight and environmental protection. Specific embodiments

[0031] Example 1

[0032] A composite panel includes a heavy bamboo board and a metal plate. The heavy bamboo boards and the metal plate are arranged alternately. One metal plate is arranged between two adjacent heavy bamboo boards. The heavy bamboo board and the metal plate are fixedly connected through a connecting piece adhesive layer. Among them, the heavy bamboo board is made of reconstituted bamboo and at least two pieces are provided. The metal plate is an aluminum alloy plate or a stainless steel plate. The connecting pieces are arranged in a matrix. Through holes are provided on the heavy bamboo board and / or the metal plate, and the through holes are adapted to the size of the connecting pieces. A number of elastic bodies are arranged in the adhesive layer, and the adhesive layer is coated on the contact surface between the heavy bamboo board and the metal plate. The setting method of the elastic body is: the elastic body is mixed evenly with the adhesive layer and then set between the heavy bamboo board and the metal plate; the diameter of the elastic body is 1-2 cm, and the material of the elastic body includes one or several of EPDM rubber, silicone rubber or polyurethane elastomer.

[0033] In the present invention, the heavy bamboo boards and metal plates are arranged alternately, with a metal plate disposed between two adjacent heavy bamboo boards. High-strength bolts or rivets can be selected as the connecting members, and an adhesive layer is coated between the heavy bamboo boards and the metal plates. Through the double fixing structure, a composite combined board with both high strength and durability is obtained. To ensure that the connecting members and adhesives maintain their connection performance with the heavy bamboo boards and metal plates, the elastomer is set into small elastic blocks. After mixing the elastomer with the adhesive, the elastomer is stably disposed between the metal plate and the heavy bamboo board by coating the adhesive on the contact surface between the metal plate and the heavy bamboo board.

[0034] Taking a three-layer composite combined board as an example, two heavy bamboo boards and one stainless steel plate with the same contact surface size are selected. Through holes are provided at corresponding positions on the stainless steel plate and the heavy bamboo boards. The connecting member is a high-strength bolt with a diameter of 8 mm, the hole diameter of the heavy bamboo board is 8.5 mm, and the hole diameter of the metal plate is 8.2 mm; the adhesive is a polyurethane adhesive, the elastomer is a polyurethane elastomer, the coating thickness is 3 mm, the elastomer has a diameter of 0.2 mm, and the elastomer accounts for 20% of the volume of the adhesive. After mixing the elastomer and the polyurethane adhesive evenly, the adhesive is coated on the heavy bamboo board. They are arranged in the order of heavy bamboo board - stainless steel plate - heavy bamboo board and are initially fixed with a clamp. The high-strength bolt is inserted into the composite combined board from one side of the heavy bamboo board and passes through the other side of the heavy bamboo board, and a nut is used for fixing. Wait for the coating to completely cure to obtain a three-layer composite combined board.

[0035] Example 2

[0036] The production process of the composite combined board includes the following steps:

[0037] S100. Preparation of heavy bamboo boards: Select 4-year-old moso bamboos with uniform diameters as raw materials. Cut the bamboo into bamboo sections with a length of 1.5 meters. Put the bamboo sections into a steaming tank and steam them at 120°C for 3 hours. Then put the steamed bamboo sections into a drying kiln and dry them at 60°C until the moisture content is 10%; Split the bamboo sections into bamboo slices with a width of 20 mm and a thickness of 5 mm. Screen and remove the bamboo slices with cracks, insect holes or deformations; After coating phenolic resin adhesive on the surface of the bamboo slices, arrange the bamboo slices parallel to the fiber direction and stack them into blanks. Put the blanks into a hot press and hot press them at 140°C and a pressure of 15 MPa for 30 minutes to form high-density recombined bamboo boards; The density of the obtained high-density heavy bamboo boards is 1.0 g / cm 3 , the compressive strength is 86 MPa, and the thickness is 30 mm. Cut the hot-pressed heavy bamboo board into a cuboid with a length of 1.4 m and a width of 1 m, and drill holes on the cuboid with a hole diameter of 6.5 mm and a hole pitch of 50 mm;

[0038] S200, preparation of metal plate: the thickness of the stainless steel plate is 20 mm, the surface of the stainless steel plate is electroplated with zinc, the size after cutting is consistent with the size of the above-mentioned heavy bamboo board, and the surface of the stainless steel plate is drilled in a matrix arrangement with a hole diameter of 6.2 mm and a hole spacing of 50 mm;

[0039] S300, forming of composite board: evenly apply epoxy resin adhesive with a thickness of 0.2mm on the contact surface of the heavy bamboo board and the stainless steel plate, use a clamp to preliminarily fix the heavy bamboo board and the stainless steel plate, insert the high-strength bolts from one side of the heavy bamboo board into the composite composite board, and pass them out from the other side of the heavy bamboo board, and fix them with nuts to ensure that the high-strength bolts are tightly fitted with the composite composite board;

[0040] S400, surface treatment: grinding and polishing the surface of the composite board, coating the composite board with a polyurethane coating with a coating thickness of 0.1 mm, placing the coated composite board in a curing chamber, curing at 80°C for 2 hours to ensure that the coating is completely cured to obtain a composite composite board.

[0041] Example 3

[0042] The production process of the composite composite board includes the following steps:

[0043] S100, preparation of heavy bamboo board: select 6-year-old bamboo with uniform diameter as raw material, cut the bamboo into bamboo segments with a length of 2 meters, put the bamboo segments into a cooking pot, cook at 130° C. for 2 hours, put the cooked bamboo segments into a drying kiln, and dry at 70° C. until the moisture content is 9%; split the bamboo segments into bamboo slices with a width of 30 mm and a thickness of 8 mm, screen and remove bamboo slices with cracks, worm eyes or deformation; after coating the surface of the bamboo slices with phenolic resin adhesive, arrange the bamboo slices in parallel according to the fiber direction, stack them into blanks, put the blanks into a hot press, and hot press them at 160° C. and a pressure of 10 MPa for 40 minutes to form a high-density reconstituted bamboo board; the density of the obtained high-density heavy bamboo board is 1.3 g / cm 3 , compressive strength is 100MPa, thickness is 20mm. Cut the hot pressed heavy bamboo board into a cuboid with a length of 1.8m and a width of 1.2m, drill holes on the cuboid, the hole diameter is 8.5mm, and the hole spacing is 100mm;

[0044] S200, preparation of metal plate: the thickness of the aluminum alloy plate is 10 mm, the surface of the aluminum alloy plate is anodized, the size after cutting is consistent with the size of the above-mentioned heavy bamboo board, and holes with a diameter of 8.2 mm and a hole spacing of 100 mm are drilled on the surface of the aluminum alloy plate in a matrix arrangement;

[0045] S300, Forming of the composite board: Uniformly coat an EVA adhesive with a thickness of 0.5 mm on the contact surface between the heavy bamboo board and the aluminum alloy board. Use a fixture to preliminarily fix the heavy bamboo board and the aluminum alloy board. Insert high-strength bolts through the composite board from one side of the heavy bamboo board and out from the other side of the heavy bamboo board, and use nuts to fix them to ensure that the high-strength bolts are closely fitted with the composite board;

[0046] S400, Surface treatment: Grind and polish the surface of the composite board, coat a polyurethane coating on the surface of the composite board with a coating thickness of 0.2 mm. Put the coated composite board into a curing chamber and cure it at 60 °C for 3 h to ensure that the coating is completely cured, and obtain the composite board.

[0047] Example 4

[0048] The production process of the composite board includes the following steps:

[0049] S100, Preparation of the heavy bamboo board: Select 5-year-old moso bamboo with uniform diameter as raw material, cut the bamboo into bamboo segments with a length of 1.8 m, put the bamboo segments into a steaming tank and steam them at 125 °C for 2.5 h. Put the steamed bamboo segments into a drying kiln and dry them at 70 °C until the moisture content is 8%; Split the bamboo segments into bamboo slices with a width of 25 mm and a thickness of 7 mm, screen and remove the bamboo slices with cracks, insect holes or deformation; After coating the surface of the bamboo slices with phenolic resin adhesive, arrange the bamboo slices parallel to the fiber direction and stack them into blanks. Put the blanks into a hot press and hot press them at 150 °C and a pressure of 12 MPa for 35 minutes to form a high-density recombinant bamboo board; The density of the obtained high-density heavy bamboo board is 1.2 g / cm 3 , the compressive strength is 90 MPa, and the thickness is 25 mm. Cut the hot-pressed heavy bamboo board into a cuboid with a length of 1.7 m and a width of 1.2 m, drill holes on the cuboid with a hole diameter of 8.5 mm and a hole spacing of 80 mm;

[0050] S200, Preparation of the metal plate: The thickness of the stainless steel plate is 14 mm. After electroplating a zinc layer on the surface of the stainless steel, cut it to the same size as the above-mentioned heavy bamboo board, and drill holes with a hole diameter of 8.2 mm and a hole spacing of 80 mm on the surface of the stainless steel plate in a matrix arrangement;

[0051] S300, Forming of the composite board: Uniformly coat a polyurethane adhesive with a thickness of 0.4 mm on the contact surface between the heavy bamboo board and the stainless steel plate. Use a fixture to preliminarily fix the heavy bamboo board and the stainless steel plate. Insert high-strength bolts through the composite board from one side of the heavy bamboo board and out from the other side of the heavy bamboo board, and use nuts to fix them to ensure that the high-strength bolts are closely fitted with the composite board;

[0052] S400, Surface treatment: Sand and polish the surface of the composite board, coat a polyurethane coating on the surface of the composite board with a coating thickness of 0.1 mm, put the coated composite board into a curing chamber, and cure it at 70 °C for 2.5 h to ensure that the coating is completely cured, obtaining a composite composite board.

[0053] Comparative Example 1

[0054] The production process of heavy bamboo board includes the following steps:

[0055] S100, Preparation of heavy bamboo board: Select 5-year-old moso bamboo with uniform diameter as raw material, cut the bamboo into bamboo segments with a length of 1.8 m, put the bamboo segments into a steaming tank, steam at 125 °C for 2.5 hours, put the steamed bamboo segments into a drying kiln, and dry at 70 °C until the moisture content is 8%; Split the bamboo segments into bamboo slices with a width of 25 mm and a thickness of 7 mm, screen and remove bamboo slices with cracks, insect holes or deformations; After coating the surface of the bamboo slices with phenolic resin adhesive, arrange the bamboo slices parallel to the fiber direction, stack them into a blank, put the blank into a hot press, and hot press at 150 °C and a pressure of 12 MPa for 35 minutes to form a high-density reconstituted bamboo board; The density of the obtained high-density heavy bamboo board is 1.2 g / cm 3 , the compressive strength is 90 MPa, and the thickness is 25 mm; According to the above method, prepare a heavy bamboo board with a thickness of 14 mm. Cut the hot-pressed heavy bamboo board into a cuboid with a length of 1.7 m and a width of 1.2 m, drill holes on the cuboid with a hole diameter of 8.5 mm and a hole spacing of 80 mm.

[0056] S200, Molding of composite board: Select two pieces of the prepared heavy bamboo board with a thickness of 25 mm and one piece of heavy bamboo board with a thickness of 14 mm, evenly coat a chloroprene rubber with a thickness of 0.4 mm on the contact surface of the heavy bamboo boards, use a fixture to preliminarily fix the heavy bamboo boards and the metal plate, pass high-strength bolts through the drilled holes of the three-layer composite board, and fix the high-strength bolts to ensure that the high-strength bolts are closely attached to the composite composite board;

[0057] S300, Surface treatment: Sand and polish the surface of the composite board to obtain a heavy bamboo board composite board.

[0058] Comparative Example 2

[0059] The production process of metal plate - bamboo and wood composite material includes the following steps:

[0060] Bamboo and wood composite material: The thickness is 25 mm, and the density is 0.8 g / cm 3 , the compressive strength is 70 MPa. Cut it into a cuboid with a length of 1.7 m and a width of 1.2 m, drill holes on the cuboid with a hole diameter of 8.5 mm and a hole spacing of 80 mm.

[0061] Preparation of metal plate: The thickness of the stainless steel plate is 14 mm. After cutting, its size is the same as that of the above-mentioned laminated bamboo board. Holes with a diameter of 8.2 mm are drilled on the surface of the metal plate in a matrix arrangement, and the hole spacing is 80 mm;

[0062] Forming of composite plate: A neoprene rubber with a thickness of 0.4 mm is evenly coated on the contact surface between the bamboo-wood composite material and the metal plate. The bamboo-wood composite material and the metal plate are preliminarily fixed using a fixture. High-strength bolts are inserted into the composite plate from one side of the bamboo-wood composite material and passed through the laminated bamboo board on the other side, and nuts are used for fixation to ensure that the high-strength bolts are closely fitted with the composite plate;

[0063] Surface treatment: The surface of the composite plate is polished to obtain a metal plate - bamboo-wood composite material.

[0064] Performance testing

[0065] The composite plates obtained in Examples 2 - 4 and Comparative Examples 1 - 2 were subjected to performance testing, and the test results are shown in Table 1.

[0066] Table 1 Performance test results of the composite plates obtained in Examples 2 - 4 and Comparative Examples 1 - 2

[0067] Project Test Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Compressive Strength (MPa) 236 223 229 142 182 Tensile Strength (MPa) 215 197 207 104 162 <![CDATA[Impact strength (kJ / m 2 )]]> 72 60 68 36 52 <![CDATA[Density (g / cm 3 )]]> 1.0 1.3 1.2 1.2 0.8 Weather Resistance (Strength Retention Rate after 1000-hour Aging, %) 95 98 98 70 81 Corrosion Resistance (1000-hour Salt Spray Test) No Corrosion No Corrosion No Corrosion Slight Corrosion Slight Corrosion

[0068] As can be seen from Table 1, the compressive strengths of the laminated bamboo - metal composite plates in Examples 2 - 4 were 236 MPa, 223 MPa, and 229 MPa respectively, which were significantly higher than 142 MPa of the pure laminated bamboo board composite plate in Comparative Example 1 and 182 MPa of the bamboo - wood composite material - metal composite plate in Comparative Example 2, indicating that the compressive strength of the laminated bamboo - metal composite plate of the present invention was significantly improved by the combination of the laminated bamboo board and the metal plate.

[0069] The tensile strengths of the laminated bamboo - metal composite plates in Examples 2 - 4 were 215 MPa, 197 MPa, and 207 MPa respectively, which were significantly higher than 104 MPa of the pure laminated bamboo board composite plate in Comparative Example 1, indicating that the addition of the metal plate significantly improved the tensile strength of the composite plate.

[0070] The impact resistance of the laminated bamboo - metal composite plates in Examples 2 - 4 were 72 kJ / m 2 、60 kJ / m 2 、68 kJ / m 2 respectively, which were significantly higher than 3672 kJ / m 2 of the pure laminated bamboo board composite plate in Comparative Example 1 and 52 kJ / m 2 of the bamboo - wood composite material - metal composite in Comparative Example 2, indicating that the rigid combination of the laminated bamboo board and the metal plate significantly improved the impact resistance of the composite plate.

[0071] The density of the laminated bamboo board in the laminated bamboo-metal composite board of Example 2 is 1.0 g / cm 3 , and the density of the bamboo-wood composite material in the bamboo-wood composite material-metal composite board of Comparative Example 2 is 0.8 g / cm 3 . However, the compressive property, tensile property and impact resistance of the composite board of Example 1 are significantly better than those of Comparative Example 2, indicating that the laminated bamboo-metal composite board of the present invention can significantly improve the compressive, tensile and impact resistance while maintaining lightness.

[0072] The weather resistances of the laminated bamboo-metal composite boards of Examples 2 to 4 are 95%, 98% and 98% respectively, which are significantly higher than 70% of Comparative Example 1 and 81% of Comparative Example 2, indicating that the selection of the composite board material and the use of the weather-resistant adhesive of the present invention have significantly improved the weather resistance of the composite laminated board.

[0073] The corrosion resistance of the laminated bamboo-metal composite boards of Examples 2 to 4 is significantly better than that of Comparative Examples 1 to 2, indicating that the anti-corrosion treatment of the metal plate, the surface coating of the composite laminated board with a polyurethane coating and the selection of the laminated bamboo board of the present invention have significantly improved the anti-corrosion ability of the composite laminated board.

[0074] The composite laminated board produced by the present invention using a laminated bamboo board and a stainless steel / aluminum alloy plate has better tensile, compressive and impact resistance, and also has excellent corrosion resistance and weather resistance.

Claims

1. A composite composite panel, characterized in that: It comprises a heavy bamboo board and a metal board, wherein the heavy bamboo board and the metal board are arranged alternately, and the heavy bamboo board and the metal board are fixedly connected by a connecting piece and an adhesive layer. Wherein, the heavy bamboo board is made of reconstituted bamboo and at least two pieces are provided, the metal plate is an aluminum alloy plate or a stainless steel plate, the connecting pieces are arranged in a matrix, the heavy bamboo board and / or the metal plate are provided with through holes, the through holes are adapted to the size of the connecting pieces, a plurality of elastomers are provided in the adhesive layer, and the adhesive layer is coated on the contact surface between the heavy bamboo board and the metal plate.

2. The composite composite panel according to claim 1, characterized in that: The setting method of the elastomer is as follows: the elastomer is dispersed in the adhesive layer, the diameter of the elastomer is 0.2-0.4 mm, the elastomer occupies 20%-30% of the volume of the adhesive, and the material of the elastomer includes one or more of EPDM rubber, silicone rubber or polyurethane elastomer.

3. The production process of the composite composite board according to claim 1 or 2, characterized in that: The following steps are involved: S100, preparation of heavy bamboo board: cutting, boiling, drying and other pretreatments of bamboo to obtain bamboo segments, dividing the bamboo segments into bamboo chips, coating the surfaces of the bamboo chips with phenolic resin adhesive, arranging the bamboo chips in parallel according to the fiber direction, stacking them into blanks, placing them in a hot press to hot-press them into high-density heavy bamboo boards, and cutting the hot-pressed heavy bamboo boards into required sizes; S200, preparation of metal plate: after anti-corrosion treatment of the metal surface, cutting the metal plate to a size consistent with the size of the above-mentioned heavy bamboo board, and drilling holes in a matrix arrangement on the surface of the metal plate; S300, forming of the composite board: evenly apply adhesive with a thickness of 0.2-0.5 mm on the contact surface of the heavy bamboo board and the metal board, use a clamp to preliminarily fix the heavy bamboo board and the metal board, and then connect and fix the heavy bamboo board and the metal board through a connector to ensure that the connector fits tightly with the composite board; S400, surface treatment: grinding and polishing the surface of the composite board, coating the surface of the composite board with a polyurethane coating having a coating thickness of 0.1 to 0.2 mm, and completely curing the coating to obtain a composite composite board.

4. The production process according to claim 3, characterized in that: In step S100, the bamboo pretreatment method is: select 4-6 year old bamboo with uniform diameter as raw material, cut the bamboo into bamboo segments with a length of 1.5-2.0 meters, put the bamboo segments into a cooking pot, cook them at 120-130° C. for 2-3 hours, put the cooked bamboo segments into a drying kiln, and dry them at 60-70° C. until the moisture content is less than 12%.

5. The production process according to claim 3, characterized in that: In step S100, the bamboo pieces have a width of 20 to 30 mm and a thickness of 5 to 8 mm, and bamboo pieces with cracks, worm holes or deformation are screened and removed.

6. The production process according to claim 3, characterized in that: In step S100, the hot pressing method is: placing the blank into a hot press, hot pressing for 30 to 40 minutes at 140 to 160° C. and a pressure of 10 to 15 MPa to form a high-density reconstituted bamboo board; the density of the high-density heavy bamboo board is 1.0 to 1.3 g / cm 3 , compressive strength is 85~100MPa, and thickness is 10~40mm.

7. The production process according to claim 3, characterized in that: In step S200, the method for anti-corrosion treatment of the metal surface includes coating an anodized coating or a galvanized coating; the diameter of the drilled holes is 6.2 to 8.5 mm, and the hole spacing is 50 to 100 mm.

8. The composite composite panel according to claim 3, characterized in that: In step S300, the adhesive includes one or more of polyurethane adhesive, epoxy resin adhesive, acrylic adhesive or EVA adhesive.

9. The production process according to claim 3, characterized in that: In step S400, the combined board is cured by placing the coated combined board in a curing chamber and curing it at 60-80°C for 2-3 hours to ensure that the coating is completely cured.