CN109594429B

CN109594429B - Composite board core board, preparation method thereof, composite board comprising composite board core board and application

Info

Publication number: CN109594429B
Application number: CN201811434364.5A
Authority: CN
Inventors: 王鹏辉; 张安; 唐地源; 张金柱; 刘顶
Original assignee: Jinan Shengquan Group Share Holding Co Ltd
Current assignee: Jinan Shengquan Group Share Holding Co Ltd
Priority date: 2018-11-28
Filing date: 2018-11-28
Publication date: 2021-04-16
Anticipated expiration: 2038-11-28
Also published as: CN109594429A

Abstract

The invention provides a composite board core board, a preparation method thereof, a composite board containing the composite board core board and an application, wherein the composite board core board comprises a cellulose substance and a filler; wherein the cellulose substance is nano-cellulose, the diameter of the nano-cellulose is 2-300nm, and the length-diameter ratio is 50-400. The composite board is prepared from cellulose substances, so that on one hand, the cellulose substances have certain viscosity, the addition of substances such as a binder and the like can be omitted, and the composite board is safe and pollution-free; on the other hand, the cellulose substance has higher strength, and can be used together with the filler to obtain the composite board core board with higher strength, and the preparation is simple; meanwhile, the core board of the composite board prepared by the invention has biodegradability and is green and environment-friendly.

Description

Composite board core board, preparation method thereof, composite board comprising composite board core board and application

Technical Field

The invention belongs to the field of composite materials, and relates to a composite board core board, a preparation method thereof, a composite board containing the composite board core board and application of the composite board core board.

Background

At present, the core board of the composite board is mainly made of EPS, rock wool, glass silk floss, flame-retardant paper honeycomb board, polyurethane and the like. The rock wool board is mainly made of basalt, is processed into artificial inorganic fibers through high-temperature melting, is uniformly added with a certain proportion of adhesive and is baked into a large board, is light in weight, but does not have safety, low strength and environmental protection. The EPS board is a rigid foam plastic board which is made by using polystyrene resin as a raw material, adding other raw auxiliary materials and polymers, heating, mixing, injecting a catalyst, and extruding and molding. Glass fiber board generally is used for soft package basic unit, and cloth art, leather etc. are wrapped again to the outside, make pleasing to the eye wall, furred ceiling decoration, and the application is more extensive, still has some not enoughly, does not possess shortcomings such as security, low and not environmental protection of intensity, and these core ubiquitous intensity are low and the shortcoming of not enough environmental protection, are difficult to satisfy people's user demand, and need use a large amount of adhesives in the preparation process of above core, pollute not environmental protection.

CN106256800A discloses a non-combustible heat-insulating composite board, which comprises a composite board core material, wherein the composite board core material adopts a mixture of perlite and mineral wool in a mass ratio of 1:0.1-2, the perlite can be replaced by perlite powder or expanded vitrified micro bubbles, the perlite powder and the expanded vitrified micro bubbles form a honeycomb hollow structure, and although the strength is increased, the non-combustible heat-insulating composite board still needs to be added with a bonding agent for use. CN102924041A discloses a nano composite board core material, the formula proportion is magnesium oxide 40-50%, magnesium chloride solution 40-45%, acid 0.3-0.4%, foaming agent 0.5-1.5% 0.5-1.5%, polyphenyl granule 1-2%, perlite 5-6%, nano aerogel 0.02-0.05%, the board core material provided adds nano material, improves the physical and chemical properties of the board, but because of the excessive metal material, the cohesiveness is not good. CN107244942A discloses a high-strength environment-friendly composite board core material and a preparation method thereof, wherein the core material is composed of the following raw materials in parts by weight: 10-16 parts of waterborne epoxy resin, 6-12 parts of porous graphene, 2-5 parts of nano calcium carbonate powder, 5-10 parts of waterborne polyurethane, 0.4-1.2 parts of dispersing agent, 1.5-4 parts of coupling agent, 0.1-0.6 part of water reducing agent, 0.5-1.5 parts of foaming agent and 30-45 parts of building waste; the construction waste is utilized to meet the requirement of resource recycling, but the raw materials are excessive, the preparation method is complex, and certain cost is increased.

At present, a composite board core board which is simple in components and does not need an adhesive is required to be developed, and the composite board core board has better strength and can meet the use requirements of different types of composite boards.

Disclosure of Invention

The invention aims to provide a composite board core board, a preparation method thereof, a composite board containing the composite board core board and application.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a composite panel core comprising a cellulosic material and a filler;

wherein the cellulose substance is nano-cellulose, the diameter of the nano-cellulose is 2-300nm, and the length-diameter ratio is 50-400.

The diameter may be 5nm, 10nm, 20nm, 50nm, 100nm, 150nm, 200nm, 220nm, 240nm, 270nm, etc., and the nanocellulose obtained in the nanocellulose production process is not uniform in size, so that the nanocellulose is a mixture of various sizes, but most of the nanocellulose should be fixed between certain sizes, for example, D90 may be 5nm, 10nm, 20nm, 50nm, 100nm, 150nm, 200nm, 220nm, 240nm, 270nm, etc., and the aspect ratio of the cellulose-based substance may be 70, 100, 120, 150, 180, 200, 220, 250, 270, 300, 350, etc.

In the invention, the composite board is prepared by selecting the cellulose substance, on one hand, the cellulose substance has certain viscosity, the addition of substances such as a binder and the like can be omitted, and the composite board is safe and pollution-free; on the other hand, the cellulose substance has higher strength, and can be used together with the filler to obtain the composite board core board with higher strength, and the preparation is simple; meanwhile, the core board of the composite board prepared by the invention has biodegradability and is green and environment-friendly.

The invention selects the nano-cellulose with the diameter of 2-300nm and the length-diameter ratio of 50-400, so that the strength of the finally obtained core plate of the composite board can meet the application requirement.

Preferably, the cellulosic material is present in an amount of 20 to 80 wt.%, e.g., 25 wt.%, 30 wt.%, 35 wt.%, 42 wt.%, 45 wt.%, 48 wt.%, 50 wt.%, 52 wt.%, 55 wt.%, 58 wt.%, 65 wt.%, 70 wt.%, 75 wt.%, etc., preferably 40 to 60 wt.%, based on 100% total composite core panel mass.

When the concentration of the cellulose substances in the invention is preferably 40-60 wt%, the finally obtained composite board core board has excellent mechanical properties.

Preferably, the cellulose-based substance contains a lignin component.

Preferably, the lignin component of the cellulosic material comprises 10-40 wt%, such as 12 wt%, 15 wt%, 18 wt%, 20 wt%, 22 wt%, 24 wt%, 25 wt%, 26 wt%, 28 wt%, 29 wt%, 30 wt%, 32 wt%, 35 wt%, 38 wt%, etc., of the cellulosic material, more preferably 20-30 wt%.

Preferably, the lignin component of the cellulosic material is chemically and/or hydrogen bonded to the nanocellulose.

Preferably, the cellulose-based substance is an A component, the A component is nano-cellulose with the diameter ranging from 4 to 50nm and the D90 ≦ 30nm (D90 can be, for example, 28nm, 25nm, 22nm, 20nm, 18nm, 15nm, 10nm, 5nm, etc.), and the aspect ratio of 200-400 (for example, 220, 250, 280, 300, 320, 350, 380, etc.).

Preferably, the cellulose-based substance is a B component, the B component is a nanocellulose with a diameter ranging from 10 to 280nm and a D10 of more than or equal to 100nm (D10 can be, for example, 110nm, 120nm, 150nm, 170nm, 180nm, 200nm, 300nm, 500nm, etc.), and an aspect ratio of 50 to 200 (for example, 60, 70, 80, 100, 120, 150, 170, 180, 190, etc.).

Preferably, the cellulose-based substance is a combination of the a component and the B component.

Preferably, the mass ratio of the A component to the B component is 1 (1-5), such as 1:1.5, 1:2, 1:2.5, 1:3, 1:2.5, 1:4, 1:4.5, etc., preferably 1 (2-4).

When the combination of the component A and the component B is selected and the mass ratio of the component A to the component B is in the range provided by the invention, the mechanical strength of the finally obtained composite board core board can be further increased.

Preferably, the filler is present in an amount of 20 to 80 wt%, such as 25 wt%, 30 wt%, 35 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, 60 wt%, 65 wt%, 70 wt%, 75 wt%, etc., based on 100% total mass of the composite core sheet.

Preferably, the filler comprises any one of or a combination of at least two of graphene materials, kaolin, wood powder, straw powder, sawdust, xylose residues, furfural residues, sucrose residues, calcium carbonate, talcum powder, diatomite, bentonite and montmorillonite.

Preferably, the graphene material includes any one of or a combination of at least two of single-layer graphene, double-layer graphene, multi-layer graphene, modified graphene, graphene oxide, reduced graphene oxide, graphene nanoplatelets, graphene nanoribbons, and graphene nanoplatelets.

The core board of the composite board can only comprise cellulose substances and fillers, the preparation is very simple, the operation is convenient, the finally obtained core board of the composite board has higher strength, the preparation process is safe, environment-friendly and pollution-free, and the core board can be produced in a large scale.

In a second aspect, the present invention provides a method of making a composite core panel according to the first aspect, the method comprising the steps of:

(1) adding the filler into the fiber substance slurry and mixing;

(2) and (3) concentrating the mixture obtained in the step (1), and then carrying out compression molding to obtain the composite board core board.

Preferably, the concentration of the fiber species in the fiber species slurry is 1-10 wt%, such as 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, etc., preferably 5-8 wt%.

Preferably, the filler is added in an amount of 0.25 to 4 times, e.g., 0.5 times, 0.75 times, 1 times, 1.25 times, 1.5 times, 1.75 times, 2 times, 2.25 times, 2.5 times, 2.75 times, 3 times, 3.25 times, 3.5 times, 3.75 times, etc., of the solid content in the fiber-based material slurry.

Preferably, the concentration is to concentrate the mix to a moisture content of 30-50%, such as 32%, 35%, 37%, 40%, 42%, 45%, 47%, etc.

Preferably, the concentration mode is any one or a combination of at least two of suction filtration, centrifugation or filter pressing.

Preferably, the pressure for the compression molding is 2 to 15MPa, such as 3MPa, 5MPa, 8MPa, 10MPa, 12MPa, 14MPa, and the like.

Preferably, the step (2) further comprises drying after the compression molding.

Preferably, the drying is air-blast drying or/and infrared drying.

Preferably, the drying is carried out at a temperature of 20-150 ℃, e.g. 30 ℃, 40 ℃, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃ etc., preferably 30-45 ℃ for a period of 5-96h, e.g. 10h, 20h, 30h, 40h, 50h, 58h, 60h, 62h, 65h, 68h, 70h, 72h, 74h, 76h, 80h, 90h etc., preferably 56-78 h.

When the drying temperature and drying time are within the preferred ranges of the present invention, the strength of the composite core panel may be increased.

In a third aspect, the present invention provides a composite panel comprising a composite core panel according to the first aspect.

Preferably, the composite core panel is surface hydrophobized.

Preferably, the surface hydrophobization treatment comprises surface coating or surface carbonization.

Preferably, the composite panel further comprises a bottom plate and a face plate.

Preferably, the bottom plate is a rubber plate, a plastic plate or a metal plate.

The core plate of the composite plate provided by the invention has wide application, can be used as the core plate, and can be matched with different types of bottom plates and face plates to prepare different composite plates so as to meet different requirements.

In a fourth aspect, the present invention provides the use of a composite panel according to the third aspect in a ceiling for a vehicle compartment, a core for a cabinet, an exterior wall panel for a building, a panel for interior decoration, an office or a ceiling tile.

Compared with the prior art, the invention has the following beneficial effects:

(1) in the invention, the composite board is prepared by selecting the cellulose substance, on one hand, the cellulose substance has certain viscosity, the addition of substances such as a binder and the like can be omitted, and the composite board is safe and pollution-free; on the other hand, the cellulose substance has higher strength, and can be used together with the filler to obtain the composite board core board with higher strength, and the preparation is simple; meanwhile, the core board of the composite board prepared by the invention has biodegradability and is green and environment-friendly;

(2) the invention selects the nano-cellulose with the diameter of 2-300nm and the length-diameter ratio of 50-400, so that the strength of the finally obtained core plate of the composite board can meet the application requirement;

(3) the core plate of the composite plate provided by the invention has higher strength, the highest static bending strength can reach 93MPa, and the highest static bending modulus can reach 9010MPa, and the core plate can be used as a core plate for preparing different types of composite plates and can meet the use requirements.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

Example 1

A core board for composite board is composed of cellulose substance (50 wt.%) and filler (50 wt.%).

Wherein the cellulose substance is nanocellulose containing lignin, the diameter of the nanocellulose is 10-180nm, the D10 is 100nm, and the length-diameter ratio is 50-200; the filler is a composition consisting of single-layer graphene, bagasse and wood flour in a mass ratio of 1:1: 2.

The preparation method comprises the following steps:

(1) adding a filler into the fiber substance slurry with the concentration of 5 wt% for mixing, wherein the adding amount of the filler is 1 time of the solid content in the fiber substance slurry;

(2) and (2) concentrating the mixture obtained in the step (1) in a suction filtration mode until the water content is 40%, then performing compression molding under the pressure of 5MPa, and finally performing infrared drying at 45 ℃ for 56 hours to obtain the core plate of the composite plate.

Example 2

The only difference from example 1 is that in the composite core panel provided in this example, the cellulosic material content was 40 wt%; the drying mode in the step (2) is infrared drying, the drying temperature is 45 ℃, and the drying time is 65 hours.

Example 3

The only difference from example 1 is that in the composite core panel provided in this example, the cellulosic material content was 60 wt%.

Example 4

The only difference from example 1 is that in the composite core panel provided in this example, the cellulosic material content was 20 wt%.

Example 5

The only difference from example 1 is that in the composite core panel provided in this example, the cellulosic material content was 80 wt%.

Example 6

The only difference from example 1 is that in the composite core panel provided in this example, the cellulosic material content was 15 wt%.

Example 7

The only difference from example 1 is that in the composite core panel provided in this example, the cellulosic material content was 85% by weight.

Example 8

The only difference from example 1 is that in the composite core board provided in this example, the cellulose-based substance is nanocellulose, the diameter of which is 2-10nm, the diameter D90 is 8nm, and the aspect ratio is 200-400.

Example 9

The only difference from example 1 is that in the composite core provided in this example, the cellulosic material is nanocellulose, which has a diameter of 20-180nm, a diameter D10 of 100, and an aspect ratio of 50-150.

Example 10

The only difference from example 1 is that in the composite core board provided in this example, the cellulose-based substance is a nanocellulose containing lignin and is a combination of a component a and a component B, wherein the diameter of the component a is 4-15nm, the diameter D90 is 9nm, the aspect ratio is 300-380, the diameter of the component B is 30-240nm, the diameter D10 is 140nm, the aspect ratio is 60-140, and the ratio of the component a to the component B is 1:1.

Example 11

The only difference from example 1 is that in the composite core board provided in this example, the cellulose-based substance is nanocellulose and is a combination of component a and component B, wherein the diameter of component a is 6-12nm, the diameter of component D90 is 7nm, the aspect ratio is 300-360, the diameter of component B is 40-210nm, the diameter of component D10 is 100nm, the aspect ratio is 70-180, and the ratio of component a to component B is 1:4.

Example 12

The only difference from example 1 is that in the composite core board provided in this example, the cellulose-based substance is nanocellulose and is a combination of component a and component B, wherein the diameter of component a is 6-20nm, D90 is 12nm, the aspect ratio is 360-400, the diameter of component B is 30-230nm, D10 is 110nm, and the aspect ratio is 70-180, and the ratio of the two is 4: 1.

Example 13

The difference from example 1 is only that in step (2), the drying mode is a combination of forced air drying and infrared drying, the drying temperature is 43 ℃, and the drying time is 75 h.

Example 14

The difference from example 1 is only that the drying mode in step (2) is forced air drying, the drying temperature is 140 ℃, and the drying time is 15 h.

Example 15

A composite core board is composed of 55 wt% of cellulose substance and 45 wt% of filler.

Wherein the cellulose substance is nanocellulose containing lignin, and has a diameter of 20-180nm, a diameter D10 of 100nm, and an aspect ratio of 10-300; the filler is a composition consisting of graphene, bagasse and wood powder in a mass ratio of 1:1: 2.

The preparation method comprises the following steps:

(1) adding a filler into the fiber substance slurry with the concentration of 10 wt% for mixing, wherein the adding amount of the filler is 1.2 times of the solid content in the fiber substance slurry;

(2) and (2) concentrating the mixture obtained in the step (1) in a suction filtration mode until the water content is 50%, then performing compression molding under the pressure of 15MPa, and finally performing infrared drying at 150 ℃ for 5 hours to obtain the core plate of the composite plate.

Example 16

A composite core board is composed of 70 wt% of cellulose substance and 30 wt% of filler.

Wherein the cellulose substance is nanocellulose containing lignin, and has a diameter of 10-180nm, a diameter D10 of 100nm, and an aspect ratio of 10-100; the filler is a composition consisting of straw powder, sawdust and bentonite according to a mass ratio of 1:3: 2.

The preparation method comprises the following steps:

(1) adding a filler into the fiber substance slurry with the concentration of 8 wt% for mixing, wherein the adding amount of the filler is 2.3 times of the solid content in the fiber substance slurry;

(2) and (2) concentrating the mixture obtained in the step (1) in a suction filtration mode until the water content is 30%, then performing compression molding under the pressure of 2MPa, and finally performing infrared drying at 20 ℃ for 96 hours to obtain the core plate of the composite plate.

Example 17

A composite core board is composed of 30 wt% of cellulose substance and 70 wt% of filler.

Wherein the cellulose substance is nanocellulose containing lignin, and has a diameter of 10-180nm, a diameter D10 of 100nm, and an aspect ratio of 30-200; the filler is montmorillonite.

The preparation method comprises the following steps:

(1) adding a filler into the fiber substance slurry with the concentration of 1 wt% for mixing, wherein the adding amount of the filler is 0.43 time of the solid content in the fiber substance slurry;

(2) and (2) concentrating the mixture obtained in the step (1) in a suction filtration mode until the water content is 45%, then performing compression molding under the pressure of 10MPa, and finally performing infrared drying at 100 ℃ for 20 hours to obtain the core plate of the composite plate.

Comparative example 1

The only difference from example 1 is that the composite core panel provided in this comparative example only comprises filler.

Comparative example 2

The only difference from example 1 is that in the composite core panel provided in this comparative example, the cellulosic material was replaced with polyvinyl alcohol.

Comparative example 3

The only difference from example 1 is that the cellulose-based substance provided in this comparative example was nanocellulose having a diameter of 100-500nm, a D10 of 300nm and an aspect ratio of 10-30.

Performance testing

Performance tests were performed on the composite core panels provided in examples 1-17 and comparative examples 1-3:

(1) the mechanical properties of the composite board core board are as follows: the test method refers to a GB/T17657-2013 artificial board and veneer artificial board physicochemical property test method, and the test results are shown in Table 1:

TABLE 1

According to the embodiment and the performance test, the core plate of the composite plate has higher strength, the static bending strength reaches more than 40MPa, the highest static bending strength can reach 93MPa, the static bending modulus can reach 4291MPa, and the highest static bending modulus can reach 9010 MPa; as can be seen from the comparison of examples 1-2 and examples 3-7, when 20-80 wt% of the cellulose-based material is selected, preferably 40-60 wt%, the composite core board obtained by the present invention has better mechanical properties; as can be seen from the comparison between example 1 and examples 8-12, when the cellulose substance selected by the invention is a combination of the component A and the component B in a certain mass ratio, the finally obtained composite board core board has better mechanical properties; as can be seen from a comparison of example 1 and examples 13-14, when the manner of drying for the composite core panel is within the preferred ranges of the present invention, the resulting composite core panel has better static bending strength and static bending modulus. As can be seen from the comparison between the example 1 and the comparative example 1, the composite board core board prepared by the cellulose substances and the filler has good mechanical property, is safe and pollution-free, and can meet the application requirements of various composite boards; as can be seen from the comparison between the example 1 and the comparative example 2, the cellulose substances and the filler are selected to be matched with each other, so that the finally obtained composite board core plate has better mechanical property; as can be seen from the comparison between example 1 and comparative example 3, the invention can meet the application requirements for preparing the core plate of the composite board only by selecting the nanocellulose with the diameter of 2-300nm and the length-diameter ratio of 50-400, and when the diameter is not in the range, the mechanical property of the obtained core plate of the composite board is greatly reduced, and the core plate of the composite board cannot be applied.

Application example 1

A composite panel comprising a base, a composite core provided in example 1 and a face sheet.

Wherein, the bottom plate is a rubber plate.

Application example 2

A composite panel comprising a base, a composite core provided in example 2 and a face sheet.

Wherein, the bottom plate is a metal plate.

The applicant states that the present invention is illustrated by the above examples of the composite core board of the present invention, the method of making the same, the composite board comprising the same and the application thereof, but the present invention is not limited to the above examples, i.e. it is not meant to imply that the present invention must be implemented by the above detailed methods. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. A composite core board is characterized in that the composite core board consists of 40-60 wt% of cellulose substances and 40-60 wt% of fillers, wherein the total mass of the composite core board is 100%;

wherein the cellulose substance is nano-cellulose;

the cellulose substance is a combination of a component A and a component B in a mass ratio of 1 (1-5), wherein the component A is nano-cellulose with the diameter range of 4-50nm, the D90 being not more than 30nm, the length-diameter ratio being 200-400, the component B is nano-cellulose with the diameter range of 10-280nm, the D10 being not less than 100nm, and the length-diameter ratio being 50-200;

the filler is selected from any one or a combination of at least two of graphene materials, kaolin, wood powder, straw powder, sawdust, xylose residues, furfural residues, sucrose residues, calcium carbonate, talcum powder, diatomite, bentonite or montmorillonite.

2. A composite board core as defined in claim 1, wherein the cellulosic material includes a lignin component.

3. A composite board core as claimed in claim 2, wherein the lignin component of the cellulosic material comprises from 10 to 40% by weight of the cellulosic material.

4. A composite board core as claimed in claim 3, wherein the lignin component of the cellulosic material comprises from 20 to 30% by weight of the cellulosic material.

5. A composite board core as recited in claim 2, wherein the lignin component of the cellulosic material is chemically bonded to the nanocellulose.

6. The composite board core board according to claim 1, wherein the mass ratio of the A component to the B component is 1 (2-4).

7. The composite panel core of claim 1, wherein the graphene material comprises any one of, or a combination of at least two of, single-layer graphene, double-layer graphene, multi-layer graphene, modified graphene, graphene oxide, reduced graphene oxide, graphene nanoplatelets, graphene nanoribbons, and graphene nanoplatelets.

8. A method of making a composite board core panel according to any of claims 1-7, comprising the steps of:

(1) adding the filler into the cellulose substance slurry and mixing;

9. The method according to claim 8, wherein the concentration of the cellulose-based substance in the cellulose-based substance slurry is 1 to 10 wt%.

10. The method according to claim 9, wherein the concentration of the cellulose-based substance in the cellulose-based substance slurry is 5 to 8 wt%.

11. The production method according to claim 8, wherein the filler is added in an amount of 0.25 to 4 times as large as a solid content in the cellulose-based substance slurry.

12. The method of claim 8, wherein the concentrating is carried out by concentrating the mix to a moisture content of 30-50%.

13. The method according to claim 8, wherein the concentration is performed by any one or a combination of at least two of suction filtration, centrifugation, and pressure filtration.

14. The production method according to claim 8, wherein the pressure for the press molding is 2 to 15 MPa.

15. The method of claim 8, wherein the step (2) further comprises drying after the press molding.

16. The method of claim 15, wherein the drying is air drying or/and infrared drying.

17. The method of claim 15, wherein the drying is carried out at a temperature of 20 to 150 ℃ for a period of 5 to 96 hours.

18. The method of claim 17, wherein the drying temperature is 30-45 ℃.

19. The method of claim 17, wherein the drying time is 56-78 hours.

20. A composite panel comprising the composite panel core of any of claims 1-7.

21. A composite board according to claim 20, wherein the composite core panel has been surface hydrophobized.

22. A composite board according to claim 21, wherein the surface hydrophobizing treatment comprises surface coating or surface carbonization.

23. A composite panel according to claim 20, further comprising a base plate and a face plate.

24. A composite board according to claim 23, wherein the base plate is a rubber plate, a plastic plate or a metal plate.

25. Use of a composite panel according to any of claims 20 to 24 in a roof of a vehicle compartment, a core of a cabinet, an exterior wall panel of a building, an interior decorative panel or a ceiling tile.