Composite board, preparation method and application thereof

Abstract

The application provides a composite board and a preparation method and application thereof, and belongs to the technical field of boards. The application controls the amount of PVC resin in the first SPC layer and the second SPC layer within a specific range, so that the toughness and rigidity of the composite board reach a suitable double balance, and the composite board has good screw holding force. Meanwhile, the first SPC layer and the second SPC layer are made of a specific formula and have good waterproof and moisture-proof performance. The honeycomb aluminum layer itself has good waterproof and moisture-proof performance, so the composite board of the application also has good waterproof and moisture-proof performance, can completely solve the problem caused by water absorption and swelling, prolong the service life of the product, and is suitable for preparing bathroom cabinets and other products.

Description

Technical Field

[0001] This application relates to the field of sheet technology, and in particular to a composite sheet, its preparation method, and its application. Background Technology

[0002] With the improvement of people's living standards, bathroom vanities are becoming increasingly widely used, especially those made of melamine board. However, bathroom vanities are often exposed to humid environments during use, and melamine boards are prone to water absorption and swelling. In severe cases, the edge banding may peel off, rendering the vanity unusable and significantly impacting the user experience and shortening the product's lifespan. Metal bathroom vanities are gradually gaining popularity. Currently, there is a composite board material on the market, made of SPC board and honeycomb aluminum, which has advantages such as waterproofing, moisture resistance, and high strength, solving problems such as dents on the surface. However, bathroom vanities made of this material sometimes experience door panel detachment during packaging testing, mainly due to weak screw holding power. Summary of the Invention

[0003] Based on the deficiencies of the existing technology, the purpose of this application is to provide a composite sheet, its preparation method and application, so as to improve the problem of weak screw holding force of the composite sheet formed by SPC sheet and honeycomb aluminum.

[0004] To achieve the above objectives, in a first aspect, this application provides a composite sheet material comprising a first SPC layer, a honeycomb aluminum layer, and a second SPC layer stacked sequentially, wherein the first SPC layer and the second SPC layer each independently comprise the following components in parts by weight:

[0005] 50-60 parts calcium carbonate

[0006] 10-15 parts of kaolin

[0007] 20-40 parts of PVC resin

[0008] Chlorinated polyethylene 0.3-2 parts,

[0009] 0.8-1.5 parts of calcium-zinc soap stabilizer.

[0010] Plasticizer 0.2-0.8 parts,

[0011] Heat stabilizer 1-2 parts,

[0012] Lubricant 0.05-1 part.

[0013] During their research, the inventors discovered that the screw-holding force of a board is closely related to its toughness and rigidity. However, the screw-holding force is not simply positively or negatively correlated with either toughness or rigidity. Only when the toughness and rigidity of the board reach a suitable balance can the board exhibit good screw-holding force. This application achieves a suitable balance between the toughness and rigidity of the composite board by controlling the amount of PVC resin in the first and second SPC layers within the aforementioned specific range, thus resulting in good screw-holding force. Simultaneously, the first and second SPC layers utilize the aforementioned specific formulation, providing excellent waterproof and moisture-proof performance. Furthermore, the honeycomb aluminum layer itself possesses excellent waterproof and moisture-proof performance. Therefore, the composite board of this application also exhibits excellent waterproof and moisture-proof performance, completely solving the problem caused by water absorption and expansion, and extending the product's service life.

[0014] In both the first and second SPC layers, the PVC resin content is independently 20-40 parts by weight, such as 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, 40 parts by weight, or any two of the above values ​​forming a range. Preferably, in both the first and second SPC layers, the PVC resin content is independently 25-35 parts by weight to enhance the screw-holding power of the composite board.

[0015] Preferably, the content of PVC resin in the first SPC layer and the content in the second SPC layer are each independently 19.6% or higher. For example, the contents of these two contents are each independently within the range formed by any two values ​​of 19.6%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 39% or higher.

[0016] Preferably, the honeycomb aluminum layer has hexagonal honeycomb holes with a side length of less than 4 mm. For example, the side length of the honeycomb holes is within the range formed by any two of the following values: 4 mm, 3.8 mm, 3.6 mm, 3.4 mm, 3.2 mm, 3 mm, 2.5 mm, 2 mm, or more.

[0017] When the side length of the honeycomb cells is less than 4mm, not only is the bonding strength between the honeycomb aluminum layer and the first SPC layer and the second SPC layer higher, and the screw holding force of the composite board is stronger, but the strength of the honeycomb aluminum layer is also higher.

[0018] Preferably, the side length of the honeycomb cells is 3-4 mm. Currently, the side length of the honeycomb cells in commercially available aluminum honeycomb materials is mainly above 3 mm. Controlling the side length of the honeycomb cells to within the range of 3-4 mm makes the aluminum honeycomb material easier to obtain.

[0019] Preferably, the first adhesive layer and the second adhesive layer comprise polyurethane adhesive, and the content of polyurethane adhesive in the first adhesive layer and the second adhesive layer is independently 74.5-120 g / m³. 2 .

[0020] By controlling the content of polyurethane adhesive in the first adhesive layer and the second adhesive layer within the aforementioned specific range, the bonding strength between the honeycomb aluminum layer and the first SPC layer and the second SPC layer is higher, and the screw-holding force of the board is also stronger.

[0021] Preferably, the calcium-zinc soap stabilizers in the first SPC layer and the second SPC layer each independently include at least one of stearic acid soap, lauric acid soap, and oleic acid soap.

[0022] Preferably, the plasticizers in the first SPC layer and the second SPC layer each independently include at least one of dioctyl terephthalate, dioctyl adipate, dioctyl sebacate, and methyl chlorostearate.

[0023] Preferably, the heat stabilizers in the first SPC layer and the second SPC layer each independently include at least one of tribasic lead sulfate, dibasic lead phosphite, dibasic lead stearate, basic lead carbonate, zinc stearate, calcium stearate, and magnesium stearate.

[0024] Preferably, the lubricant in the first SPC layer and the second SPC layer each independently comprises at least one of solid paraffin and microcrystalline wax.

[0025] Preferably, the PVC resin in the first SPC layer and the second SPC layer comprises PVC micropipe material, and the content of the PVC micropipe material in the first SPC layer and the second SPC layer is independently 5-10 parts by weight. For example, the content of the PVC micropipe material in the first SPC layer is within the range formed by any two of the following values: 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, or more; and the content of the PVC micropipe material in the second SPC layer is within the range formed by any two of the following values: 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, or more.

[0026] PVC small tubes have a lower cost. By using PVC small tubes to provide part of the PVC resin and controlling the amount of PVC small tubes within the above-mentioned specific range, the composite board can have a better screw-holding force while the cost is lower.

[0027] Without compromising the technical effect of this application, the first SPC layer and the second SPC layer also include large pipe material.

[0028] Preferably, the thickness of the first SPC layer and the second SPC layer are each independently between 1.5 and 2.5 mm. For example, the thickness of the first SPC layer is within the range formed by any two of the following values: 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, 2.2 mm, 2.4 mm, 2.5 mm, or more; the thickness of the second SPC layer is within the range formed by any two of the following values: 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, or more. Controlling the thickness of the first SPC layer and the second SPC layer within the range of 1.5-2.5 mm allows for higher strength and stronger screw-holding power in the composite board at a lower cost.

[0029] Preferably, the thickness of the honeycomb aluminum layer is 8-20 mm. For example, the thickness of the honeycomb aluminum layer is within the range of any two values ​​formed by 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, or more. Honeycomb aluminum has high strength, high specific stiffness, and light weight. Controlling the thickness of the honeycomb aluminum layer within the range of 8-20 mm helps to improve the mechanical properties of the product.

[0030] Preferably, the thickness of the composite board is 12-25 mm. For example, the thickness of the composite board is within the range formed by any two of the following values: 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm.

[0031] Preferably, the composite board further includes a first decorative layer, a second decorative layer, a third adhesive layer, and a fourth adhesive layer, wherein,

[0032] The first finishing layer is bonded to the surface of the first SPC layer opposite to the honeycomb aluminum layer by the third adhesive layer;

[0033] The second finishing layer is bonded to the surface of the second SPC layer opposite to the honeycomb aluminum layer by the fourth adhesive layer.

[0034] Preferably, the thickness of the first finishing layer and the second finishing layer are each independently 0.15-0.25 mm. For example, the thickness of the first finishing layer is within the range formed by any two of the following values: 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm; and the thickness of the second finishing layer is within the range formed by any two of the following values: 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm.

[0035] Preferably, the third adhesive layer and the fourth adhesive layer comprise polyurethane adhesive, and the content of polyurethane adhesive in the third adhesive layer and the fourth adhesive layer is independently 74.5-120 g / m³. 2 .

[0036] Preferably, the first finishing layer and the second finishing layer are each independently a PVC film layer or a PET film layer.

[0037] More preferably, the first finishing layer and the second finishing layer are each independently a PVC film layer. PVC film is a more common finishing material in composite panels, and it is widely available, readily available, and inexpensive.

[0038] By controlling the content of polyurethane adhesive in the third adhesive layer and the fourth adhesive layer within the aforementioned specific range, the bonding strength between the first SPC layer and the first finishing layer, and between the second SPC layer and the second finishing layer, is increased, thus preventing the first finishing layer and the second finishing layer from detaching.

[0039] Secondly, this application provides a method for preparing the composite board, comprising the following steps:

[0040] According to the formulations of the first SPC layer and the second SPC layer, calcium carbonate, kaolin, PVC resin, chlorinated polyethylene, calcium zinc soap stabilizer, plasticizer, heat stabilizer and lubricant are mixed, dispersed and extruded to obtain the first SPC board and the second SPC board.

[0041] The first SPC board, the honeycomb aluminum, and the second SPC board are bonded together in sequence using a first adhesive and a second adhesive, and then a first pressing is performed. Then, a PVC film is bonded to the surfaces of the first SPC board and the second SPC board away from the honeycomb aluminum using a third adhesive and a fourth adhesive, and then a second pressing is performed to obtain a composite board.

[0042] Preferably, during the preparation of the first SPC board and the second SPC board, the molding temperature is independently 150-180℃;

[0043] Preferably, both the first adhesive and the second adhesive comprise polyurethane adhesive, and the coating amount of each adhesive is independently 74.5-120 g / m³. 2 By using polyurethane adhesive to bond the honeycomb aluminum to the first and second SPC boards, and controlling its amount within the specific range mentioned above, the bonding strength between them was improved, and the screw-holding force of the boards was also increased.

[0044] Preferably, the pressure of the first pressing is 30-50 tons, the pressing temperature is 150-180℃, and the holding time is 7-15 hours.

[0045] Preferably, both the third and fourth adhesives comprise polyurethane adhesive, and the coating amount of each adhesive is independently 74.5-120 g / m³. 2 .

[0046] Preferably, the pressure of the second pressing is 30-50 tons, the pressing temperature is 150-180℃, and the holding time is 7-15 hours.

[0047] Preferably, the production line speed for the composite board is 18-25 meters per minute.

[0048] Thirdly, this application provides the application of the composite board in bathroom cabinets. The composite board can be used as the main cabinet base plate, side panels, pull strips, sheathing, and door panels of a bathroom cabinet.

[0049] The bathroom cabinet includes a main cabinet base plate, side panels, pull strips, sheathing, and door panels, and at least one of the main cabinet base plate, side panels, pull strips, sheathing, and door panels is made of the composite board material.

[0050] Compared with the prior art, the beneficial effects of this application are as follows: By controlling the amount of PVC resin in the first SPC layer and the second SPC layer within a specific range, this application achieves a suitable balance between the toughness and rigidity of the composite board, resulting in better screw holding force; at the same time, the first SPC layer and the second SPC layer are made with a specific formula, which has good waterproof and moisture-proof performance; the honeycomb aluminum layer itself has good waterproof and moisture-proof performance. Therefore, the composite board of this application also has good waterproof and moisture-proof performance, which can completely solve the problem caused by water absorption and expansion, and extend the service life of the product. Attached Figure Description

[0051] Figure 1This is a schematic diagram of the structure of the composite panel obtained in Example 1, wherein 1-honeycomb aluminum layer, 21-first SPC layer, 22-second SPC layer, 31-first decorative layer, and 32-second decorative layer. Detailed Implementation

[0052] To better illustrate the purpose, technical solutions, and advantages of this application, the following description, in conjunction with specific embodiments and comparative examples, aims to provide a detailed understanding of the content of this application, rather than limiting it. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this application. Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this application are commonly used reagents and instruments. In this application, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0053] Example 1

[0054] This embodiment provides a composite board, including a first decorative layer 31 and a third adhesive layer (not included in the above) stacked sequentially. Figure 1 (as shown in the image), first SPC layer 21, first adhesive layer (not shown in the image). Figure 1 (as shown in the image), honeycomb aluminum layer 1, second adhesive layer (not shown in the image). Figure 1 (as shown in the image), second SPC layer 22, fourth adhesive layer (not shown in the image). Figure 1 (as shown in the middle) and the second finishing layer 32, wherein,

[0055] The honeycomb aluminum layer 1 has hexagonal honeycomb holes with a side length of 3mm and a thickness of 14mm.

[0056] The first and second adhesive layers are made of polyurethane adhesive, and both have an adhesive application rate of 100g / m². 2 ;

[0057] The composition of the first SPC layer 21 and the second SPC layer 22 is shown in Table 1. The calcium zinc soap stabilizer is stearic acid soap, the plasticizer is dioctyl terephthalate, the heat stabilizer is tribasic lead sulfate, the lubricant is solid paraffin, and the thickness of the first SPC layer 21 and the second SPC layer 22 is 2 mm.

[0058] The third and fourth adhesive layers are made of polyurethane adhesive, and both have an adhesive application rate of 100g / m². 2 ;

[0059] The first decorative layer 31 and the second decorative layer 32 are PVC films, both with a thickness of 0.20 mm;

[0060] The thickness of the composite board is 19mm.

[0061] The preparation method of the composite board in this embodiment includes the following steps: according to the formula in Table 1, all raw materials are mixed, dispersed, and extruded to obtain SPC board, wherein the molding temperature is 170℃;

[0062] Polyurethane adhesive was applied to one side of one of the obtained SPC boards. After the adhesive was applied, honeycomb aluminum was laid on the surface. Then, polyurethane adhesive (using a shark-shaped adhesive) was applied to one side of another obtained SPC board and bonded to the honeycomb aluminum, resulting in a three-layer structure of SPC board-honeycomb aluminum-SPC board. The resulting three-layer structure of SPC board-honeycomb aluminum-SPC board was directly placed on a press for pressing. The pressing pressure was 40 tons, the pressing temperature was 165℃, and the holding time was 10 hours. The amount of polyurethane adhesive applied to each SPC board was 100g / m². 2 ;

[0063] Polyurethane adhesive (Henkel) was used to bond PVC film to both sides of the three-layer structure of SPC board-aluminum honeycomb-SPC board after lamination, with an adhesive application rate of 100g / m² on each side. 2 Then, it is placed directly on the press for pressing. The pressing pressure is 40 tons, the pressing temperature is 170℃, the holding time is 10 hours, and the production line speed is 22 meters / min to obtain the composite board.

[0064] Examples 2-9 and Comparative Examples 1-2

[0065] These embodiments and comparative examples all provide a composite board. The difference between these composite boards and Example 1 is that the composition of the first SPC layer 21 and the second SPC layer 22 is different. The specific formulations of the first SPC layer 21 and the second SPC layer 22 are shown in Table 1. The types of calcium zinc soap stabilizer, plasticizer, heat stabilizer and lubricant are the same as those in Example 1. In addition, the preparation method of these composite boards is the same as that in Example 1.

[0066] Table 1

[0067]

[0068] Examples 10-11

[0069] These embodiments all provide a composite material, which differs from Embodiment 1 in that the side lengths of the honeycomb cells in the honeycomb aluminum layer 1 are different.

[0070] In Example 10, the side length of the honeycomb holes in the honeycomb aluminum layer 1 is 4 mm.

[0071] In Example 11, the side length of the honeycomb holes in the honeycomb aluminum layer 1 is 5 mm;

[0072] The preparation methods for these composite boards are the same as in Example 1.

[0073] Examples 12-15

[0074] These embodiments all provide a composite board, which differs from Embodiment 1 in that the amount of adhesive applied to the first adhesive layer and the second adhesive layer is different.

[0075] In Example 12, the amount of adhesive applied to both the first and second adhesive layers was 74.5 g / m². 2 The thickness of the composite board is 18.9mm;

[0076] In Example 13, the amount of adhesive applied to both the first and second adhesive layers was 120 g / m². 2 The thickness of the composite board is 19.1mm;

[0077] In Example 14, the amount of adhesive applied to both the first and second adhesive layers was 65 g / m². 2 The thickness of the composite board is 18.78mm;

[0078] In Example 15, the amount of adhesive applied to both the first and second adhesive layers was 140 g / m². 2 The composite board thickness is 19.5mm;

[0079] The preparation methods for these composite boards are the same as in Example 1, except that the amount of polyurethane adhesive applied is adjusted accordingly.

[0080] Examples 16-17

[0081] These embodiments all provide a composite panel that differs from Embodiment 1 in that the thicknesses of the honeycomb aluminum layer 1, the first SPC layer 21, the second SPC layer 22, the first decorative layer 31, the second decorative layer 32, and the composite panel are different. Furthermore, the types of calcium zinc soap stabilizer, plasticizer, heat stabilizer, and lubricant contained in the first SPC layer 21 and the second SPC layer 22 are different (as are the adhesives used in the third and fourth adhesive layers, if applicable), as detailed below:

[0082] In Example 16, the thickness of the honeycomb aluminum layer 1 is 9 mm, the thickness of the first SPC layer 21 and the second SPC layer 22 is 1.5 mm, the thickness of the first decorative layer 31 and the second decorative layer 32 is 0.15 mm, the thickness of the resulting composite board is 12.9 mm, the calcium zinc soap stabilizer is lauric acid soap, the plasticizer is dioctyl adipate, the heat stabilizer is dibasic lead phosphite, the lubricant is microcrystalline wax, and the first adhesive layer, the second adhesive layer, the third adhesive layer and the fourth adhesive layer are all made of polyurethane adhesive (with shark).

[0083] In Example 17, the thickness of the honeycomb aluminum layer 1 is 19 mm, the thickness of the first SPC layer 21 and the second SPC layer 22 is 2.5 mm, the thickness of the first decorative layer 31 and the second decorative layer 32 is 0.25 mm, the thickness of the resulting composite board is 25.1 mm, the calcium zinc soap stabilizer is oleic acid soap, the plasticizer is methyl chlorinated stearate, the heat stabilizer is zinc stearate, and the lubricant is microcrystalline wax;

[0084] The preparation methods for these composite boards are the same as in Example 1.

[0085] Test case

[0086] The composite panels obtained in the above embodiments and comparative examples were tested as follows:

[0087] (1) The screw holding force was determined according to GB / T 17657-2022 Test Method for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels, 4.21. The screw holding force was mainly tested using PA pre-embedded nuts and self-tapping screws. The screws were placed in a constant temperature and humidity chamber at 20℃ and 65% humidity until the mass was constant. After the screws were driven in, they were pulled out at a uniform speed of 5mm / min. The test results showed that the greater the force of pulling out the screws, the better the performance of the board.

[0088] (2) Peel resistance was determined according to GB / T 17657-2022 Test Method for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels, 4.20. The panel was placed in a constant temperature and humidity chamber at 20℃ and 65% humidity until the mass was constant. The panel was cut 10mm from one end to the SPC board and half of the SPC board was pulled apart. The upper and lower clamps of the tensile testing machine clamped the peeling end of the SPC board and the peeled SPC board respectively. The sample was placed vertically and the tensile testing machine was pulled apart at a uniform speed. The greater the peel resistance, the better the performance of the board.

[0089] (3) The composite board is made into a bathroom cabinet. The specific preparation method is as follows:

[0090] ① Use a panel saw to cut the composite board into the required dimensions for the main cabinet base plate, side panels, tie rods, sheathing and door panels;

[0091] ② Edge sealing: PVC edge sealing strips are used for edge sealing;

[0092] ③ Drilling: Use a six-sided drill to make holes;

[0093] ④ Assembly: Connect the main cabinet base, side panels, pull strips, sheathing, and door panels using four-in-one connectors to create a bathroom cabinet. Conduct a drop test according to QBT 4465-2013 General Technical Requirements for Furniture Packaging; if the product remains intact and makes no abnormal noise when shaken after the test, it indicates that the board material has good performance.

[0094] The test results are shown in Table 2.

[0095] Table 2

[0096]

[0097] As can be seen from the above data, the composite board of the present application embodiment has good screw holding force, such as a screw holding force of more than 450N; the first SPC layer and the second SPC layer have strong peel force with the honeycomb aluminum layer, such as a peel force of more than 40N. The door panel of the bathroom cabinet made therefrom is not easy to fall off, and the cabinet door does not produce abnormal noise after shaking after the drop test.

[0098] Comparing Examples 1-5 with Comparative Examples 1-2, it can be seen that when the amount of PVC resin in the first SPC layer and the second SPC is too low, the composite board has weak toughness, resulting in weak screw holding force; when the amount of PVC resin in the first SPC layer and the second SPC is too high, the composite board has weak rigidity, resulting in weak screw holding force; when the amount of PVC resin in both the first SPC layer and the second SPC is 20-40 parts by weight, especially 25-35 parts by weight, the composite board has good screw holding force.

[0099] Comparing Examples 1 and 10-11, it can be seen that when the side length of the honeycomb holes in the honeycomb aluminum layer is less than 4mm, the screw holding force is stronger, and the peeling force between the first SPC layer and the second SPC layer and the honeycomb aluminum layer is also stronger.

[0100] A comparison of Examples 1, 12-15 shows that when the amount of polyurethane adhesive applied is between 74.5-120 g / m², 2 Within the specified range, the screw holding force is stronger, and the peeling force between the first SPC layer and the second SPC layer and the honeycomb aluminum layer is also stronger.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.

Claims

1. A composite board, characterized in that, It comprises a first SPC layer, a first adhesive layer, a honeycomb aluminum layer, a second adhesive layer, and a second SPC layer stacked sequentially, wherein the first SPC layer and the second SPC layer each independently contain the following components in parts by weight: 50-60 parts calcium carbonate 10-15 parts of kaolin 20-40 parts of PVC resin Chlorinated polyethylene 0.3-2 parts, 0.8-1.5 parts of calcium-zinc soap stabilizer. Plasticizer 0.2-0.8 parts, Heat stabilizer 1-2 parts, Lubricant 0.05-1 part; The composite board further includes a first decorative layer, a second decorative layer, a third adhesive layer, and a fourth adhesive layer, wherein, The first finishing layer is bonded to the surface of the first SPC layer opposite to the honeycomb aluminum layer by the third adhesive layer; The second finishing layer is bonded to the surface of the second SPC layer opposite to the honeycomb aluminum layer by the fourth adhesive layer; The honeycomb aluminum layer has hexagonal honeycomb holes with a side length of less than 4mm.

2. The composite board as described in claim 1, characterized in that, In the first SPC layer and the second SPC layer, the PVC resin content is 25-35 parts by weight, respectively.

3. The composite board as described in claim 1, characterized in that, The side length of the honeycomb holes is 3-4 mm.

4. The composite board as described in claim 1, characterized in that, The first adhesive layer and the second adhesive layer both contain polyurethane adhesive, and the content of polyurethane adhesive in the first adhesive layer and the second adhesive layer is independently 74.5-120 g / m³. 2 .

5. The composite board as described in claim 1, characterized in that, The first SPC layer and the second SPC layer satisfy at least one of conditions A1 to A8: A1. The calcium-zinc soap stabilizers in the first SPC layer and the second SPC layer each independently include at least one of stearic acid soap, lauric acid soap and oleic acid soap; A2. The plasticizers in the first SPC layer and the second SPC layer each independently include at least one of dioctyl terephthalate, dioctyl adipate, dioctyl sebacate, and methyl chlorostearate; A3. The heat stabilizers in the first SPC layer and the second SPC layer each independently include at least one of tribasic lead sulfate, dibasic lead phosphite, dibasic lead stearate, basic lead carbonate, zinc stearate, calcium stearate and magnesium stearate; A4. The lubricants in the first SPC layer and the second SPC layer each independently include at least one of solid paraffin and microcrystalline wax; A5. The PVC resin in the first SPC layer and the second SPC layer includes PVC small tube material, and the content of the PVC small tube material in the first SPC layer and the second SPC layer is 5-10 parts by weight, respectively. A6. The thickness of the first SPC layer and the second SPC layer are each 1.5-2.5 mm independently; A7. The thickness of the honeycomb aluminum layer is 8-20mm; A8. The thickness of the composite board is 12-25mm.

6. The composite board as described in claim 1, characterized in that, It also meets at least one of the following conditions: B1. The thickness of the first finishing layer and the second finishing layer are each independently 0.15-0.25 mm; B2. The third adhesive layer and the fourth adhesive layer comprise polyurethane adhesive, and the content of polyurethane adhesive in the third adhesive layer and the fourth adhesive layer is independently 74.5-120 g / m³. 2 ; B3. The first decorative layer and the second decorative layer are each independently a PVC film layer or a PET film layer.

7. A method for preparing a composite board according to any one of claims 1 to 6, characterized in that, Includes the following steps: According to the formulations of the first SPC layer and the second SPC layer, calcium carbonate, kaolin, PVC resin, chlorinated polyethylene, calcium zinc soap stabilizer, plasticizer, heat stabilizer and lubricant are mixed, dispersed and extruded to obtain the first SPC board and the second SPC board. The first SPC board, the honeycomb aluminum, and the second SPC board are bonded together in sequence using a first adhesive and a second adhesive, and then a first pressing is performed. Then, a PVC film is bonded to the surfaces of the first SPC board and the second SPC board away from the honeycomb aluminum using a third adhesive and a fourth adhesive, and then a second pressing is performed to obtain a composite board.

8. The method for preparing the composite board as described in claim 7, characterized in that, At least one of the following conditions must be met: C1. During the preparation of the first SPC board and the second SPC board, the molding temperature is independently 150-180℃; C2. Both the first adhesive and the second adhesive comprise polyurethane adhesive, and the coating amount of each adhesive is independently 74.5-120 g / m³. 2 ; C3. The first pressing is performed at a temperature of 150-180℃ for a holding time of 7-15 hours. C4. Both the third and fourth adhesives comprise polyurethane adhesive, and the coating amount of each adhesive is independently 74.5-120 g / m². 2 ; C5. The second pressing is performed at a temperature of 150-180℃ and a holding time of 7-15 hours.

9. The application of the composite board as described in any one of claims 1 to 6 in bathroom cabinets.

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