CN104802235A - Composite board, preparation method and application thereof - Google Patents

Abstract

The invention discloses a composite board, which comprises a surface layer, a core layer and a bottom layer in order from top to bottom, the core layer includes a central core layer and a reinforcement layer, and the upper and lower surfaces of the core layer are respectively bonded to the The top layer is connected to the bottom layer. The invention also discloses a preparation method of the above-mentioned composite plate: the embryos are arranged in the order of the surface layer, the core layer and the bottom layer, respectively coated with phenolic resin glue, and after the embryos are assembled, the composite plate is obtained by hot pressing and compounding. The composite plate prepared by the invention can be used for the bottom plate of the container, and its various performance indexes such as density, strength, elastic modulus and surface quality all reach the international container industry standard.

Description

A kind of composite plate, preparation method and application thereof

technical field

The invention belongs to the technical field of composite materials, and in particular relates to a composite plate, a preparation method and an application thereof.

Background technique

The container floor is the main stress-bearing part of the container. Due to its strict requirements on mechanical properties, it has always been made of cold and tropical hardwood panels or multi-layer composite panels made of these panels. However, hardwood has a long growth cycle and generally It will take 50 years or even longer, while the demand for container floor is increasing day by day. The depletion of hardwood resources forces us to look for better alternative resources and develop new types of container floor, which is an urgent problem we need to solve.

A kind of manufacture method of high-strength bamboo plywood is described in the patent CN1105624A, and paint is a kind of manufacture method of container floor with bamboo plywood. First, divide and classify the original bamboo and cut it off. Separate the bamboo green, bamboo yellow, and bamboo core through a layering machine, and use a plastic machine to mill the different bamboo strips into equal width, equal thickness, and equal straightness. Bamboo slices, then weaving-drying-gluing-embryo-forming-hot pressing, the method is complex, the utilization rate of bamboo is low, and the required mechanical equipment and manpower are more.

In the patent No. CN201694572, a metal frame and a plastic floor are used to prepare a floor structure for a container. A metal frame is arranged side by side between the beams on both sides of the bottom of the container, and a plastic floor is arranged between the metal frames. Since the strength of the metal skeleton is much higher than that of the original design, the strength requirement for the plastic floor can be reduced, and the plastic floor can be made of thermoplastic material with a low melting point, which can be recycled. However, metal still accounts for a large proportion in the metal-plastic composite floor, and there is no obvious advantage in weight; and the connection between the metal skeleton and the plastic floor is troublesome, usually through rivets, which increases the process and reduces the efficiency.

Contents of the invention

Aiming at the problems of the prior art, the object of the present invention is to provide a composite board for the bottom plate that can meet the requirements of the loading strength of the container. The fiber-reinforced composite board is combined with the ordinary wooden composite board. After scientific structural design and The unique processing method obtains a composite board that meets the requirements of the container floor, replacing the traditional plywood for the container floor made of tropical broad-leaved hardwood such as Southeast Asian clone wood.

Another object of the present invention is to provide a method for preparing the above-mentioned composite board.

The third object of the present invention is to provide a use of the above-mentioned composite plate.

In order to achieve the above object, the technical scheme of the present invention is as follows:

The invention provides a composite plate, which comprises a surface layer, a core layer and a bottom layer from top to bottom, the core layer includes a core layer and a reinforcement layer, and the upper and lower surfaces of the core layer are respectively bonded to the The top layer is connected to the bottom layer.

The reinforcement layer is located on both sides or in the middle of the core layer.

The thickness of the surface layer or the bottom layer is 0.5-2 mm.

The single-layer thickness of the core layer is 3-8 mm.

The reinforcing layer is selected from one or a mixture of fiber unidirectional cloth or fiber reinforced thermosetting composite board.

When the reinforcing layer is a fiber-reinforced thermosetting composite plate, the thickness is 0.5-2mm.

The fiber unidirectional fabric is selected from glass fiber unidirectional fabric, carbon fiber unidirectional fabric or basalt fiber unidirectional fabric, preferably glass fiber unidirectional fabric or basalt unidirectional fabric.

The number of layers of the enhancement layer is 1-4 layers.

The fiber unidirectional fabric in the reinforcing layer has a thickness of 0.5-1.0 mm and a grammage of 200-500 g/m ² .

The surface layer or the bottom layer are fiber-reinforced thermosetting composite boards.

The fiber reinforced thermosetting composite sheet is selected from one or more of short fiber reinforced thermoplastic sheet (SFT), long fiber reinforced thermoplastic sheet (LFT or GMT) or continuous fiber reinforced thermoplastic sheet (CFT).

The fibers in the fiber-reinforced thermosetting composite sheet are selected from one or more of continuous glass fibers, carbon fibers or basalt fibers; preferably glass fibers or basalt fibers; more preferably glass fibers.

The thermosetting resin in the fiber-reinforced thermosetting composite sheet is one or more selected from epoxy resin, phenolic resin, unsaturated polyester resin, vinyl resin or polyimide resin, preferably phenolic resin.

The mass percent of fibers in the fiber-reinforced thermosetting composite board is 40-55%.

The core layer is a blockboard.

The blockboard is one or more of eucalyptus blockboard, pine blockboard, poplar blockboard or Chinese fir blockboard; the number of layers is 3 to 7, and the thickness of a single layer is 3.0 to 8.0 mm, water content ≤ 8%.

The single-layer arrangement of the core layer adopts one or a mixture of criss-cross arrangement or longitudinal arrangement.

The present invention also provides a method for preparing the above-mentioned composite board, comprising the following steps:

The embryos are arranged in the order of the surface layer, the core layer and the bottom layer, respectively coated with phenolic resin glue, and after the embryos are assembled, they are hot-pressed and composited to obtain a composite plate.

The preparation method of the surface layer or the bottom layer is as follows: after the fibers are arranged and warped, the resin is impregnated through an impregnation tank equipped with a thermosetting resin; the fibers impregnated with the resin are extruded to fully infiltrate the fibers with the resin, The mass percentage of the fiber is 40-55%; after drying, the surface layer and the bottom layer are compacted.

The core layer includes a central core layer and a reinforcing layer. The central core layer and the reinforcing layer are laid, and the adjacent two layers are covered with phenolic resin glue. Then get the core layer.

When the reinforcing layer is a fiber-reinforced thermosetting composite plate, the preparation method is as follows: after the fibers are warped, the resin is impregnated through an impregnation tank equipped with a thermosetting resin; the fibers impregnated with the resin are extruded to make the resin fully The fibers are soaked, and the mass percentage of the fibers is 40-55%; after drying, they are compacted to obtain the surface layer and the bottom layer.

The core layer is a blockboard, and the preparation method of the blockboard is as follows: the wood is cut into uniform wood bundles or strips, and then it is dried to control the moisture content of 2 to 8%; Glue is applied to bundles or wooden strips, and then paved to form embryos, and finally placed in a press for hot pressing at a temperature of 105°C-160°C, a pressure of 1.0-30MPa, and a hot-pressing time of 3-30min, and cold-pressed to form a joinery plate.

The glue is one or more of melamine modified resin glue, polyurethane glue and isocyanate glue.

The wood board is one of eucalyptus wood board, pine wood board, poplar wood board or cedar wood board.

The moisture content of the wood board is 6-12%.

The coating amount of the phenolic resin glue is 300-400g/m ² .

The hot-pressing temperature of the hot-pressing compound is 130-140 ° C, the pressure is 1.0-2.0 MPa, and the pressure is kept for 10-15 minutes; then the pressure is reduced to half, and after 4-6 minutes, the pressure is completely relieved and exhausted , Relieve the pressure, or pass cold water inward, and release the pressure after cooling to room temperature to obtain a composite plate.

The present invention also provides the use of the above-mentioned composite plate as the bottom plate of the container; the composite plate has the advantages of good wear resistance, corrosion resistance, no water absorption, easy cleaning and the like.

Compared with the prior art, the present invention has the following advantages:

1. The composite plate prepared by the present invention can be used as the bottom plate of the container, and its performance indicators such as density, strength, elastic modulus and surface quality all reach the international container industry standard.

2. The composite plate prepared by the present invention adopts the method of interspersing the reinforced fiber unidirectional cloth layer in the core layer, utilizes the characteristic of high tensile strength in the single direction of the reinforced fiber unidirectional cloth, and through reasonable laying group embryo design, The bending performance of the container floor material in the length direction is enhanced.

3. The composite plate of the present invention has strong designability, and the thickness and density of the surface layer and the core layer can be reasonably selected according to actual needs, so as to achieve the best economic effect. The surface layer of the bottom plate is fiber reinforced composite material, which has good wear resistance, corrosion resistance, non-absorbent, and easy to clean. Compared with the hardwood bottom plate, the service life of the composite plate of the present invention is greatly improved, and the process of spraying paint on the bottom surface is eliminated , beneficial to environmental protection. In addition, the composite material board is not easy to corrode, does not grow bacteria, and will not have the problem of insects.

4. The composite board of the present invention has completely got rid of the long-term dependence on tropical broad-leaved hardwood and large-diameter logs. The composite materials, reinforced fiber unidirectional cloth and ordinary wooden boards used are all renewable resources, which are the source of container floor materials Opened up a new way to promote the sustainable development of the container industry.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of the composite plate shown in Example 1.

FIG. 2 is a schematic cross-sectional structure diagram of the composite plate shown in Example 2. FIG.

FIG. 3 is a schematic cross-sectional structure diagram of the composite plate shown in Example 3. FIG.

FIG. 4 is a schematic cross-sectional structure diagram of the composite plate shown in Example 4. FIG.

Wherein: 11 is the surface layer, 12 is the first core layer, 13 is the reinforcing layer, 14 is the second core layer; 15 is the bottom layer; 16 is the core layer; 21 is the surface layer, 22 is the first core layer, 23 is a reinforcement layer, 24 is a second core layer; 25 is a bottom layer; 26 is a core layer; 31 is a surface layer, 32 is a first core layer, 33 is a reinforcement layer, and 34 is a second core layer; 35 is a 36 is the core layer; 41 is the surface layer, 42 is the first core layer, 43 is the reinforcing layer, 44 is the second core layer; 45 is the bottom layer; 46 is the core layer.

Detailed ways

The present invention will be described in further detail below in conjunction with the embodiments shown in the accompanying drawings.

Fiber-reinforced thermosetting composite sheet, with light weight, high specific strength, high specific modulus, good corrosion resistance, water resistance, and abrasion resistance; inert to various acids and alkalis, impact resistance, high breaking strain value; flexible design Good performance, you can choose the appropriate fiber type, fiber content and fiber orientation to meet the requirements of specific applications.

Blockboard, commonly known as large core board, is made of two veneers glued together in the middle. The total thickness of the double-sided glued veneers of the blockboard shall not be less than 3mm. The corner defects of various blockboards shall not exceed 5mm in width and 20mm in length within the nominal format. The middle board is made of high-quality natural wood boards after heat treatment (that is, drying in the drying room), processed into wooden strips of certain specifications, and spliced by a jigsaw machine. The spliced wooden boards are covered with two layers of high-quality veneer on both sides, and then glued by cold and hot presses. The moisture content of the blockboard used below is ≤8%.

The moisture content of the boards used below is 6-12%.

Example 1

As shown in Figure 1, Figure 1 is a cross-sectional schematic diagram of the composite board shown in Example 1, wherein the fiber-reinforced thermosetting board is the surface layer and the bottom layer, and the eucalyptus blockboard reinforced by glass fiber unidirectional cloth is the core layer 16.

The composite sheet mainly includes a surface layer 11, a core layer 16 and a bottom layer 15 from top to bottom, wherein the upper and lower surface layers are continuous glass fiber reinforced phenolic resin sheets, and the thicknesses of the upper and lower two surface layers are 1.0 mm and 1.0 mm respectively. 1.0mm, the core layer is meranti blockboard reinforced with glass fiber unidirectional cloth, which is composed of glass fiber unidirectional cloth (produced by Zhenshi Group Hengshi Fiber Base Co., Ltd.) and meranti blockboard. After hot pressing, the core layer The thickness is 26mm.

A composite plate, the preparation method is as follows:

(1) Preparation of surface layer 11 or bottom layer 15:

After the continuous glass fiber is warped, it is impregnated with resin through an impregnation tank equipped with phenolic resin; the continuous glass fiber impregnated with resin is extruded to make the resin fully infiltrate the fiber, and the mass percentage of the fiber is 40%; After drying, it is compacted to obtain a continuous glass fiber reinforced phenolic resin sheet.

(2) First cut the eucalyptus planks into rectangular cuboid strips with a thickness of 4mm, and then manually assemble these strips. These strips are laid flat one by one to ensure that the joints are seamless. All the joint sides must be coated with Glue, the glue is melamine modified resin glue, and the slab to be spelled out should be a regular rectangle. Send the slab into the hot press smoothly, after the pressing plate is closed, manually squeeze the slab (fix one long side of the slab, and apply external force on the other long side), hot press at 110°C-120°C, pressure 25MPa After 30 minutes, take out the core board and paste the middle board (the amount of glue required for each slab is 1 kg, 8 middle board skins), pay attention to the adjacent board skins should be connected without overlapping, and then sent to the hot press machine, at 110°C- 120°C, hot pressing at a pressure of 20MPa for 15min, take out the core plate, paste the surface plate (the amount of glue required for each slab is 1 kg, and 2 pieces of skin for the surface plate), and send it into the hot press machine, at 110°C-120°C, the pressure Hot press at 10MPa for 10min, then slowly release the pressure to 0MPa, and take out the slab. After the slab is cut, the eucalyptus blockboard is obtained.

(3) The core layer 16 includes, from top to bottom, the first core layer 12, the reinforcement layer 13, the first core layer 12, the reinforcement layer 13, the second core layer 14, the first core layer 12, the second Core layer 14, reinforcement layer 13, first core layer 12, reinforcement layer 13, first core layer 12, the first core layer 12 is longitudinal meranti blockboard, and the second core layer 14 is transverse willow Eucalyptus blockboard, the first core layer 12 has five layers, the second core layer 14 has two layers, the reinforcement layer 13 is glass fiber unidirectional cloth, the thickness is 0.5mm, and the grammage is 200g/m ² , there are 4 layers in total. Layers; each layer is connected by phenolic resin glue, and the glue amount of phenolic resin is 300g/m ² ;

Arrange the embryos in the order of the surface layer 11, the core layer 16 and the bottom layer 15, each layer is connected by phenolic resin glue, and the amount of glue applied to the phenolic resin is 300g/m ² ;

(4) Hot pressing after embryo formation, the temperature is 140°C, the pressure is 2.0MPa, and the pressure is maintained for 15 minutes; then the pressure is reduced to half, and after 6 minutes, the pressure is completely relieved, exhausted, and pressure relieved, or Pass cold water inside, release the pressure after it cools down to room temperature, and make a composite board.

The composite plate, through conventional post-production, is used as the bottom plate of the container, and can achieve the static bending strength along the grain ≥ 85MPa, the static bending strength ≥ 30MPa across the grain; the elastic modulus along the grain ≥ 10000MPa, the elastic modulus ≥ 3000MPa performance.

Example 2

As shown in Figure 2, Figure 2 is a cross-sectional schematic diagram of the composite board shown in Example 2, wherein the continuous fiber reinforced thermosetting board is the surface layer and the bottom layer, and the pine blockboard reinforced with glass fiber unidirectional cloth is the core layer 26.

The composite sheet includes a surface layer 21, a core layer 26 and a bottom layer 25 from top to bottom, wherein the upper and lower surface layers are continuous glass fiber reinforced phenolic resin sheets, and the thicknesses of the upper and lower two surface layers are 2.0 mm and 2.0 mm respectively. mm, the core layer is pine blockboard reinforced with glass fiber unidirectional cloth, which is composed of glass fiber unidirectional cloth (produced by Zhenshi Group Hengshi Fiber Base Co., Ltd.) and pine blockboard. The thickness of the core layer after hot pressing is 24mm.

A composite plate, the preparation method is as follows:

(1) Preparation of surface layer 21 or bottom layer 25:

After the continuous glass fiber is warped, it is impregnated with resin through an impregnation tank equipped with phenolic resin; the continuous glass fiber impregnated with resin is extruded to make the resin fully infiltrate the fiber, and the mass percentage of the fiber is 45%; After drying, it is compacted to obtain a continuous glass fiber reinforced phenolic resin sheet.

(2) First cut the pine planks into rectangular cuboid strips with a thickness of 6mm, and then manually assemble these strips. These strips are laid flat one by one to ensure that the joints are seamless, and all the joint sides must be coated with glue Liquid, glue is polyurethane glue, and the slab that spells out should be regular rectangle. Send the slab into the hot press smoothly, after the pressing plate is closed, manually squeeze the slab (fix one long side of the slab, and apply external force on the other long side), hot press at 110°C-120°C, pressure 25MPa After 30 minutes, take out the core board and paste the middle board (the amount of glue required for each slab is 1 kg, 8 middle board skins), pay attention to the adjacent board skins should be connected without overlapping, and then sent to the hot press machine, at 110°C- 120°C, hot pressing at a pressure of 20MPa for 15min, take out the core plate, paste the surface plate (the amount of glue required for each slab is 1 kg, and 2 pieces of skin for the surface plate), and send it into the hot press machine, at 110°C-120°C, the pressure Hot press at 10MPa for 10min, then slowly release the pressure to 0MPa, and take out the slab. After the slab is cut, the pine blockboard is obtained.

(3) The core layer 26 includes, from top to bottom, the first core layer 22, the second core layer 24, the reinforcement layer 23, the second core layer 24, the second core layer 24, the reinforcement layer 23, the second Core layer 24, the first core layer 22, the first core layer 22 is a longitudinal pine blockboard, the second core layer 24 is a transverse pine blockboard, and the reinforcing layer 23 is a glass fiber unidirectional cloth with a thickness of 1.0mm, weight 500g/m ² , 2 layers in total, mainly placed on both sides of the core layer (see Figure 2 for the specific arrangement structure); each layer is connected by phenolic resin glue, the amount of phenolic resin glue 300g/m ² ;

According to the order of the surface layer 21, the core layer 26 and the bottom layer 25, the group embryos are arranged, and the layers are connected by phenolic resin glue, and the amount of glue applied to the phenolic resin is 300g/m ² ;

(4) Hot press after embryo formation, the temperature is 130°C, the pressure is 1.0MPa, and the pressure is maintained for 10 minutes; then the pressure is reduced to half, and after 4 minutes, the pressure is completely relieved, exhausted, and pressure relieved, or Pass cold water inside, release the pressure after it cools down to room temperature, and make a composite board.

The composite plate, through conventional post-production, is used as the bottom plate of the container, and can achieve the static bending strength along the grain ≥ 85MPa, the static bending strength ≥ 30MPa across the grain; the elastic modulus along the grain ≥ 10000MPa, the elastic modulus ≥ 3000MPa performance.

Example 3

As shown in Figure 3, Figure 3 is a cross-sectional schematic diagram of the composite board shown in Example 3, wherein the continuous fiber reinforced thermosetting board is the surface layer and the bottom layer, and the poplar blockboard reinforced with glass fiber unidirectional cloth is the core layer 36.

The composite sheet mainly includes a surface layer 31, a core layer 36 and a bottom layer 35 from top to bottom, wherein the upper and lower surface layers are continuous glass fiber reinforced phenolic resin sheets, and the thicknesses of the upper and lower two surface layers are respectively 0.5mm and 0.5mm, the core layer is poplar joinery reinforced with glass fiber unidirectional cloth, which is composed of glass fiber unidirectional cloth (produced by Zhenshi Group Hengshi Fiber Base Industry Co., Ltd.) and poplar joinery. The thickness of the core layer after hot pressing is 27mm.

A composite plate, the preparation method is as follows:

(1) Preparation of surface layer 31 or bottom layer 35:

After the continuous glass fiber is arranged and warped, the resin is impregnated through an impregnation tank equipped with phenolic resin; the continuous glass fiber impregnated with the resin is extruded to make the resin fully infiltrate the fiber, and the mass percentage of the fiber is 50%; After drying, it is compacted to obtain a continuous glass fiber reinforced phenolic resin sheet.

(2) First cut the poplar planks into rectangular cuboid strips with a thickness of 5mm, and then manually assemble these strips. These strips are laid flat one by one to ensure that the joints are seamless, and all the joint sides must be coated with Glue, the glue is isocyanate glue, and the slabs to be spelled out should be regular rectangles. Send the slab into the hot press smoothly, after the pressing plate is closed, manually squeeze the slab (fix one long side of the slab, and apply external force on the other long side), hot press at 110°C-120°C, pressure 25MPa After 30 minutes, take out the core board and paste the middle board (the amount of glue required for each slab is 1 kg, 8 middle board skins), pay attention to the adjacent board skins should be connected without overlapping, and then sent to the hot press machine, at 110°C- 120°C, hot pressing at a pressure of 20MPa for 15min, take out the core plate, paste the surface plate (the amount of glue required for each slab is 1 kg, and 2 pieces of skin for the surface plate), and send it into the hot press machine, at 110°C-120°C, the pressure Hot press at 10MPa for 10min, then slowly release the pressure to 0MPa, and take out the slab. After the slab is cut, poplar blockboard is obtained.

(3) The core layer 36 includes, from top to bottom, the first core layer 32, the reinforcement layer 33, the second core layer 34, the second core layer 34, the reinforcement layer 33, the second core layer 34, the second Central core layer 34, reinforcing layer 33, first central core layer 32, the first central core layer 32 is a longitudinal poplar blockboard, the second central core layer 34 is a transverse poplar blockboard, and the reinforcing layer 33 is a glass fiber unidirectional cloth, The thickness is 1.0mm, the gram weight is 500g/m ² , and there are 3 layers in total, which are mainly placed in the middle and both sides of the core layer (see Figure 3 for the specific arrangement structure); the layers are connected by phenolic resin glue, and the phenolic resin The amount of glue applied is 300g/m ² ;

According to the order of the surface layer 31, the core layer 36 and the bottom layer 35, the group embryos are arranged, and the layers are connected by phenolic resin glue, and the amount of glue applied to the phenolic resin is 300g/m ² ;

(4) Hot press after embryo formation, the temperature is 135°C, the pressure is 1.5MPa, and the pressure is maintained for 12 minutes; then the pressure is reduced to half, and after 5 minutes, the pressure is completely relieved, exhausted, and pressure relieved, or Pass cold water inside, release the pressure after it cools down to room temperature, and make a composite board.

The composite plate, through conventional post-production, is used as the bottom plate of the container, and can achieve the static bending strength along the grain ≥ 85MPa, the static bending strength ≥ 30MPa across the grain; the elastic modulus along the grain ≥ 10000MPa, the elastic modulus ≥ 3000MPa performance.

Example 4

As shown in Figure 4, Figure 4 is a cross-sectional schematic diagram of the composite board shown in Example 4, wherein the continuous fiber reinforced thermosetting board is the surface layer and the bottom layer, and the cedar blockboard reinforced by glass fiber unidirectional cloth is the core layer 46.

The composite sheet mainly includes a surface layer 41, a core layer 46 and a bottom layer 45 from top to bottom, wherein the upper and lower surface layers are continuous glass fiber reinforced phenolic resin sheets, and the thicknesses of the upper and lower two surface layers are 1.5 mm and 1.5 mm respectively. 1.5mm, the core layer is poplar joinery reinforced with glass fiber unidirectional cloth, which is composed of glass fiber unidirectional cloth (produced by Zhenshi Group Hengshi Fiber Base Industry Co., Ltd.) and Chinese fir blockboard. The thickness of the core layer after hot pressing is 25mm .

A composite plate, the preparation method is as follows:

(1) Preparation of surface layer 41 or bottom layer 45:

After the continuous glass fiber is warped, it is impregnated with resin through an impregnation tank equipped with phenolic resin; the continuous glass fiber impregnated with resin is extruded to make the resin fully infiltrate the fiber, and the mass percentage of the fiber is 55%; After drying, it is compacted to obtain a continuous glass fiber reinforced phenolic resin sheet.

(2) First cut the cedar wood planks into rectangular slats with a thickness of 4mm, and then artificially assemble these slats. These slats are laid flat in turn to ensure that the joints are seamless. All the connected sides must be coated with Glue, the glue is melamine modified resin glue, and the slab to be spelled out should be a regular rectangle. Send the slab into the hot press smoothly, after the pressing plate is closed, manually squeeze the slab (fix one long side of the slab, and apply external force on the other long side), hot press at 110°C-120°C, pressure 25MPa After 30 minutes, take out the core board and paste the middle board (the amount of glue required for each slab is 1 kg, 8 middle board skins), pay attention to the adjacent board skins should be connected without overlapping, and then sent to the hot press machine, at 110°C- 120°C, hot pressing at a pressure of 20MPa for 15min, take out the core plate, paste the surface plate (the amount of glue required for each slab is 1 kg, and 2 pieces of skin for the surface plate), and send it into the hot press machine, at 110°C-120°C, the pressure Hot press at 10MPa for 10min, then slowly release the pressure to 0MPa, and take out the slab. After the slab is cut, it is a Chinese fir blockboard.

(3) The core layer 46 includes a first core layer 42, a reinforcement layer 43, a second core layer 44, a reinforcement layer 43, a second core layer 44, a second core layer 44, and a second core layer 44 from top to bottom. Central core layer 44, reinforcing layer 43, the second central core layer 44, reinforcing layer 43, the first central core layer 42, the first central core layer 42 is a longitudinal incense fir blockboard, and the second central core layer 44 is a transverse incense Chinese fir blockboard, the reinforcement layer 43 is glass fiber unidirectional cloth, the thickness is 0.5mm, the grammage is 200g/m ² , there are 4 layers in total, mainly placed on both sides of the core layer (see Figure 4 for the specific arrangement structure); Layers are connected by phenolic resin glue, and the amount of phenolic resin glue applied is 300g/m ² ;

According to the order of the surface layer 41, the core layer 46 and the bottom layer 45, the group embryos are arranged, and the layers are connected by phenolic resin glue, and the amount of glue applied to the phenolic resin is 300g/m ² ;

(4) Hot press after embryo formation, the temperature is 140°C, the pressure is 2.0MPa, and the pressure is kept for 15 minutes; then the pressure is reduced to half, and after 4 minutes, the pressure is completely relieved, exhausted, and pressure relieved, or Pass cold water inside, release the pressure after it cools down to room temperature, and make a composite board.

The composite plate, through conventional post-production, is used as the bottom plate of the container, and can achieve the static bending strength along the grain ≥ 85MPa, the static bending strength ≥ 30MPa across the grain; the elastic modulus along the grain ≥ 10000MPa, the elastic modulus ≥ 3000MPa performance.

Example 5

A composite plate comprises a surface layer, a core layer and a bottom layer in sequence from top to bottom, wherein the core layer also includes reinforcement layers interspersed on both sides of the core layer. Among them, the upper and lower surface layers are continuous carbon fiber reinforced epoxy resin plates, the thickness of the upper and lower two surface layers are 1.0mm and 1.0mm respectively, the core layer is poplar blockboard reinforced with carbon fiber unidirectional cloth, and the reinforcement layer is carbon fiber single Fabric (produced by Zhenshi Group Hengshi Fiber Base Co., Ltd.), with a weight of 200g/m ² and a thickness of 0.5mm; the thickness of the core layer after hot pressing is 26mm.

A composite plate, the preparation method is as follows:

(1) Preparation of top layer or bottom layer:

After the continuous carbon fiber is warped, it is impregnated with resin through an impregnation tank equipped with epoxy resin; the continuous carbon fiber impregnated with resin is extruded to make the resin fully infiltrate the fiber, and the mass percentage of the fiber is 48%; drying Post-compaction to obtain continuous carbon fiber reinforced epoxy resin sheet panels.

(2) Preparation of the core layer: first cut poplar planks into rectangular cuboid strips with a thickness of 8mm, and then artificially assemble these strips, and lay them flat in order to ensure that the joints are seamless. The sides to be connected must be coated with glue, the glue is melamine modified resin glue, and the slab that is spelled out should be a regular rectangle. Send the slab into the hot press smoothly, after the pressing plate is closed, manually squeeze the slab (fix one long side of the slab, and apply external force on the other long side), hot press at 110°C-120°C, pressure 25MPa After 30 minutes, take out the core board and paste the middle board (the amount of glue required for each slab is 1 kg, 8 middle board skins), pay attention to the adjacent board skins should be connected without overlapping, and then sent to the hot press machine, at 110°C- 120°C, hot pressing at a pressure of 20MPa for 15min, take out the core plate, paste the surface plate (the amount of glue required for each slab is 1 kg, and 2 pieces of skin for the surface plate), and send it into the hot press machine, at 110°C-120°C, the pressure Hot press at 10MPa for 10min, then slowly release the pressure to 0MPa, and take out the slab. After the slab is cut, poplar blockboard is obtained.

(3) The core layer from top to bottom is 1 layer of poplar blockboard veneer layer arranged vertically, 1 layer of poplar blockboard veneer layer arranged horizontally, 1 layer of reinforcement layer arranged vertically, and 1 layer of poplar blockboard layer arranged horizontally Board veneer layer, 1 longitudinally arranged reinforcement layer, 1 longitudinally arranged poplar blockboard veneer layer; each layer is connected by phenolic resin glue, and the amount of phenolic resin glue applied is 300g/m ² ;

Arrange the embryos in the order of the surface layer, the core layer and the bottom layer, and connect each layer with phenolic resin glue, and the glue amount of phenolic resin is 300g/m ² ;

(4) After the embryos are formed, carry out hot-press compounding. The hot-press temperature is 130°C, the pressure is 2.0MPa, and the pressure is maintained for 10 minutes; then the pressure is reduced to half, and after 5 minutes, the pressure is completely released, exhausted, and unloaded. Pressurize, or pass cold water inside, release the pressure after it cools to room temperature, and make a composite board.

Example 6

A composite plate comprises a surface layer, a core layer and a bottom layer in sequence from top to bottom, wherein the core layer also includes reinforcement layers interspersed on both sides of the core layer. Among them, the upper and lower surface layers are continuous basalt fiber reinforced polyimide resin boards, the thickness of the upper and lower two surface layers are 2.0mm and 2.0mm respectively, the core layer is poplar wood reinforced by continuous basalt fiber unidirectional cloth, and the reinforcement layer It is basalt fiber unidirectional cloth (produced by Zhenshi Group Hengshi Fiber Base Co., Ltd.), with a grammage of 200g/m ² and a thickness of 0.5mm; the thickness of the core layer after hot pressing is 24mm.

A composite plate, the preparation method is as follows:

(1) Preparation of top layer or bottom layer:

After the continuous basalt fiber is warped, it is impregnated with resin through an impregnation tank equipped with polyimide resin; the continuous basalt fiber impregnated with resin is extruded to fully infiltrate the fiber with the resin, and the mass percentage of the fiber is 52 %; after drying and compaction to obtain continuous basalt fiber reinforced polyimide resin sheet.

(2) Preparation of the core layer: first cut the pine planks into rectangular cuboid strips with a thickness of 3mm, and then artificially assemble these strips. These strips are laid flat in turn to ensure that the joints are seamless, and all joints The side of the board must be coated with glue, the glue is polyurethane glue, and the slab that is spelled out should be a regular rectangle. Send the slab into the hot press smoothly, after the pressing plate is closed, manually squeeze the slab (fix one long side of the slab, and apply external force on the other long side), hot press at 110°C-120°C, pressure 25MPa After 30 minutes, take out the core board and paste the middle board (the amount of glue required for each slab is 1 kg, 8 middle board skins), pay attention to the adjacent board skins should be connected without overlapping, and then sent to the hot press machine, at 110°C- 120°C, hot pressing at a pressure of 20MPa for 15min, take out the core plate, paste the surface plate (the amount of glue required for each slab is 1 kg, and 2 pieces of skin for the surface plate), and send it into the hot press machine, at 110°C-120°C, the pressure Hot press at 10MPa for 10min, then slowly release the pressure to 0MPa, and take out the slab. After the slab is cut, the pine blockboard is obtained.

(3) The core layer from top to bottom is 3 layers of pine blockboard veneer layers arranged vertically and horizontally, 1 layer of pine blockboard veneer layers arranged vertically, 1 layer of reinforcement layer arranged vertically, and 1 layer of vertically arranged Pine blockboard veneer layer, 3 layers of pine blockboard veneer layers alternately arranged vertically and horizontally; each layer is connected by phenolic resin glue, and the glue amount of phenolic resin is 300g/m ² ;

Arrange the embryos in the order of the surface layer, the core layer and the bottom layer, and connect each layer with phenolic resin glue, and the glue amount of phenolic resin is 300g/m ² ;

(4) After the embryos are formed, hot-press compounding is carried out. The hot-press temperature is 135°C, the pressure is 1.0MPa, and the pressure is maintained for 15 minutes; then the pressure is reduced to half, and after 6 minutes, the pressure is completely released, exhausted, and unloaded. Pressurize, or pass cold water inside, release the pressure after it cools to room temperature, and make a composite board.

In the present invention, the fiber-reinforced thermosetting plate with high strength and high hardness is used as the surface layer material or the middle load-bearing layer material, and the blockboard is used as the core layer material. After reasonable combination and scientific gluing process, it can be made into a composite material with high performance. The boards give full play to the characteristics of fiber-reinforced thermosetting boards such as wear resistance, acid and alkali resistance, water resistance, high modulus and high strength, and meet various mechanical and physical technical requirements for container bottom plates in all aspects.

The above description of the embodiments is for those of ordinary skill in the art to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the embodiments herein. Improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should fall within the protection scope of the present invention.

Claims (14)

1. a composite board, is characterized in that: comprise face layer, core layer and bottom layer successively from top to bottom, described core layer comprises middle core layer and reinforcing layer, the upper and lower surfaces of described core layer pass phenolic resin glue and The surface layer is connected to the bottom layer. 2. The composite board according to claim 1, characterized in that: the reinforcing layer is located on both sides or in the middle of the core layer; Or the thickness of the surface layer or the bottom layer is 0.5-2mm; Or the single-layer thickness of the core layer is 3-8mm; Or the reinforcing layer is selected from one or a mixture of fiber unidirectional fabric or fiber reinforced thermosetting composite board. 3. The composite board according to claim 2, characterized in that: when the reinforcing layer is a fiber-reinforced thermosetting composite board, the thickness is 0.5-2 mm; Or the fiber unidirectional fabric is selected from glass fiber unidirectional fabric, carbon fiber unidirectional fabric or basalt fiber unidirectional fabric, preferably glass fiber unidirectional fabric or basalt unidirectional fabric; Or the number of layers of the enhancement layer is 1 to 4 layers; Or the fiber unidirectional fabric in the reinforcement layer has a thickness of 0.5-1.0 mm and a grammage of 200-500 g/m ² . 4. The composite board according to claim 1, characterized in that: the surface layer or the bottom layer are both fiber-reinforced thermosetting composite boards. 5. The composite panel according to claim 2 or 4, characterized in that: the fiber-reinforced thermosetting composite panel is selected from one of short fiber reinforced thermoplastic panels, long fiber reinforced thermoplastic panels or continuous fiber reinforced thermoplastic panels species or more than one species; Or the fibers in the fiber-reinforced thermosetting composite sheet are selected from one or more of continuous glass fibers, carbon fibers or basalt fibers; preferably glass fibers or basalt fibers; more preferably glass fibers; Or the thermosetting resin in the fiber-reinforced thermosetting composite sheet is selected from one or more of epoxy resin, phenolic resin, unsaturated polyester resin, vinyl resin or polyimide resin, preferably phenolic resin; Or the mass percentage of fibers in the fiber-reinforced thermosetting composite board is 40-55%. 6. The composite board according to claim 1, characterized in that: the core layer is a blockboard. 7. The composite board according to claim 6, characterized in that: the blockboard is one or more of meranti blockboard, pine blockboard, poplar blockboard or Chinese fir blockboard ;The number of layers is 3-7 layers, the thickness of a single layer is 3.0-8.0mm, and the water content is ≤8%; Or the single-layer arrangement of the core layer adopts one or a mixture of criss-cross arrangement or longitudinal arrangement. 8. A method for preparing a composite sheet according to any one of claims 1 to 7, characterized in that: comprising the following steps: The embryos are arranged in the order of the surface layer, the core layer and the bottom layer, respectively coated with phenolic resin glue, and after the embryos are assembled, they are hot-pressed and composited to obtain a composite plate. 9. The preparation method of the composite board according to claim 8, characterized in that: the preparation method of the surface layer or the bottom layer is as follows: after the fibers are warped, the fibers are removed through a dipping tank equipped with a thermosetting resin. Impregnating the resin; extruding the fibers impregnated with the resin, so that the resin fully infiltrates the fibers, and the mass percentage of the fibers is 40-55%; drying and compacting to obtain the surface layer and the bottom layer; Or the core layer includes a central core layer and a reinforcing layer, the central core layer and the reinforcing layer are laid, and the adjacent two layers are covered with phenolic resin glue. The core layer is obtained after pressing. 10. The preparation method of the composite board according to claim 9, characterized in that: the preparation method when the reinforcing layer is a fiber-reinforced thermosetting composite board is as follows: after the fibers are warped, the fiber is passed through a thermosetting resin Impregnating the resin in an impregnation tank; extruding the fibers impregnated with the resin to fully infiltrate the fibers with the resin, and the mass percentage of the fibers is 40-55%; drying and compacting to obtain the surface layer and the bottom layer; Or the core layer is a blockboard, and the preparation method of the blockboard is as follows: the wood is cut into uniform beams or strips, and then it is dried to control the moisture content of 2 to 8%; Glue is applied to wood bundles or strips, then paved to form embryos, and finally placed in a press for hot pressing at a temperature of 105°C-160°C, a pressure of 1.0-30MPa, and a hot-pressing time of 3-30min. wood board. 11. The preparation method of the composite board according to claim 10, characterized in that: the glue is one or more of melamine modified resin glue, polyurethane glue, and isocyanate glue; Or the plank is one of eucalyptus plank, pine plank, poplar plank or Chinese fir plank; Or the moisture content of the wood board is 6-12%. 12 . The method for preparing composite panels according to claim 8 or 9 , characterized in that: the amount of the phenolic resin glue applied is 300-400 g/m ² . 13. The preparation method of the composite board according to claim 8, characterized in that: the hot-pressing temperature of the hot-pressing composite is 130-140°C, the pressure is 1.0-2.0 MPa, and the holding time is 10-15 minutes ; Then reduce the pressure to half, keep it for 4-6 minutes, and then completely release the pressure, exhaust, release the pressure, or pass cold water inward, wait for it to cool to room temperature, and then release the pressure to obtain a composite plate. 14. Use of the composite plate according to any one of claims 1 to 7 as a container bottom plate.