Preparation method of composite core material, composite core material and vacuum insulation panel

Abstract

The invention discloses a preparation method of a composite core material, which comprises the following steps: step 1, putting expanded perlite, an adhesive, a gas releasing agent and water into mixing equipment according to a ratio, fully mixing and uniformly stirring; secondly, the materials obtained in the first step are placed in forming equipment, and the materials are controlled to enter a forming cavity of the forming equipment according to the density and the volume of the core materials; thirdly, the pressing pressure of a pressing plate of the forming equipment is set, and the pressing plate is pressed downwards to press and shape the materials in the forming cavity to form a semi-finished composite core material; 4, demolding the semi-finished composite core material prepared in the step 3, and taking out for later use; 5, the semi-finished product core material is placed in baking equipment to be baked, and the semi-finished product core material is dehydrated to form a finished product composite core material. The invention further discloses the composite core material and the vacuum insulation panel. The adhesive and the expanded perlite are mixed, so that the prepared composite core material has higher strength, and the composite core material can be directly loaded into a barrier film bag for vacuumizing.

Description

Technical Field

[0001] The present invention relates to the technical field of composite core materials, and particularly relates to a preparation method of a composite core material, a composite core material, and a vacuum insulation panel. Background Art

[0002] Currently, the world is facing an energy crisis, and energy conservation and emission reduction have become the focus of worldwide attention. The development of new energy, new technologies, and new materials is imperative. As a new type of thermal insulation material, the vacuum insulation panel has a low thermal conductivity and a thin thickness. Therefore, the vacuum insulation panel has great development potential for reducing energy consumption and improving economy in the fields of refrigerators, cold storages, medical insulation boxes, buildings, etc. The vacuum insulation panel consists of four parts: a core material, a desiccant, a getter, and a high-barrier film. The high-barrier film effectively avoids heat transfer by gas by maintaining a high vacuum degree inside to the greatest extent, thereby achieving efficient thermal insulation.

[0003] As the skeleton structure of the vacuum insulation panel, in addition to being a supporting material, the core material of the vacuum insulation panel can also limit the movement space of some gas molecules remaining in the vacuum insulation panel. According to the morphological and structural characteristics of the core material, the core material can generally be divided into particulate, foam, fiber, and composite core materials. Common particulate core materials include fumed silica and expanded perlite. Among them, expanded perlite has the advantages of low density, low price, and environmental friendliness. When using expanded perlite as the core material of the vacuum insulation panel, it is necessary to load the expanded perlite into a bag that is breathable but not powder-permeable and press it into shape, and then transfer the pressed core material to a barrier film bag for vacuum pumping.

[0004] Since expanded perlite is in particulate form, after the expanded perlite is loaded into a bag that is breathable but not powder-permeable and pressed into a core material, the core material is not shaped, and the core material is prone to collapse during the transfer process, thereby affecting the bagging of the core material. Summary of the Invention

[0005] Based on the above problems existing in the prior art, one object of the embodiments of the present application is to provide a preparation method of a composite core material, which mixes an adhesive with expanded perlite, so that the prepared composite core material has a higher strength, thereby realizing that it is not necessary to load the core material into a bag that is breathable but not powder-permeable for pressing into shape, and the core material can be directly loaded into a barrier film bag for vacuum pumping.

[0006] The second object of the embodiments of the present application is to provide a composite core material.

[0007] The third object of the embodiments of the present application is to provide a vacuum insulation panel.

[0008] The technical solution adopted by the present application to solve its technical problems is: a preparation method of a composite core material, including the following steps:

[0009] Step 1: Place expanded perlite, adhesive, gas releasing agent, and water in a mixing device according to a ratio, and mix and stir them evenly.

[0010] Step 2: Place the material obtained in Step 1 into a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material.

[0011] Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material.

[0012] Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby.

[0013] Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material.

[0014] Furthermore, in Step 1, the ratio of expanded perlite, adhesive, gas releasing agent, and water is 100:2.5 - 7.5:15 - 30:100 - 250.

[0015] Furthermore, the gas releasing agent is an oxygen gas releasing agent.

[0016] Furthermore, the gas releasing agent is hydrogen peroxide.

[0017] Furthermore, the gas releasing agent is potassium permanganate.

[0018] Furthermore, the adhesive is a vegetable-based adhesive.

[0019] Furthermore, the adhesive is sesbania gum.

[0020] Furthermore, the baking time of the baking device is 2h - 12h, and the baking temperature is 100°C - 300°C.

[0021] Furthermore, the mesh number of the expanded perlite is 70 mesh - 120 mesh.

[0022] Furthermore, the pressure holding time when the pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity is 2min - 4min.

[0023] Furthermore, a first anti-sticking layer is provided on the surface of the forming cavity; a second anti-sticking layer is provided on the surface of the pressing plate.

[0024] The technical solution adopted by the present application to solve its technical problems is: a composite core material made by the above-mentioned preparation method.

[0025] The technical solution adopted by this application to solve its technical problems is: a vacuum insulation panel, including a composite core material, an adsorbent, and a barrier bag. The composite core material is made by the above-mentioned preparation method, and the adsorbent and the composite core material are arranged together in the vacuum cavity of the barrier bag.

[0026] The beneficial effects of this application are as follows: When making this composite core material, due to the use of an adhesive and a gas releasing agent, after expanded perlite, the adhesive, the gas releasing agent, and water are fully mixed and pressed into a semi-finished composite core material, and then the semi-finished composite core material is dried to obtain a completely dehydrated finished core material. This finished core material has a good forming effect and high strength, so that it is not necessary to put the core material into a bag that is breathable but not powder-permeable for compression molding. Instead, the core material can be directly put into a barrier film bag for vacuum pumping. And through testing, the vacuum insulation panel made of this core material has a lower thermal conductivity.

[0027] At the same time, this invention uses a plant-based adhesive and by adding a gas releasing agent, during the process of making the composite core material, the gas releasing agent will decompose and release oxygen. The oxygen can partially oxidize the plant-based adhesive, making the closed pores formed during compression molding become through holes. In this way, when vacuum pumping is carried out during the process of making a vacuum insulation panel using this composite core material, the number of closed pores is greatly reduced, thereby reducing the thermal conductivity of the vacuum insulation panel. Specific embodiments

[0028] To better explain this invention for easy understanding, it will be described in detail through specific embodiments.

[0029] A preparation method of a composite core material of this invention includes the following steps:

[0030] Step 1, put expanded perlite, an adhesive, hydrogen peroxide, and water in proportion into a mixing device, fully mix and stir evenly; Step 2, put the material obtained in Step 1 into a forming device, and quantitatively control the material entering the forming cavity of the forming device according to the density and volume of the core material; Step 3, set the pressure of the pressing plate of the forming device to press down according to the density and volume of the core material, and the pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material; Step 4, demold and take out the semi-finished composite core material made in Step 3 for standby; Step 5, put the semi-finished core material into a baking device for baking to dehydrate it to form a finished composite core material.

[0031] Thus, a method for preparing a composite core material according to the present invention, when manufacturing the composite core material, due to the use of an adhesive and a gas releasing agent, after expanded perlite, the adhesive, the gas releasing agent, and water are fully mixed and pressed into a semi-finished composite core material, the semi-finished composite core material is then dried to obtain a completely dehydrated finished core material. The finished core material has a good forming effect and high strength, so that it is not necessary to put the core material into a bag that is breathable but not powder-permeable for compression molding. Instead, the core material can be directly put into a barrier film bag for vacuum pumping. And through testing, the thermal conductivity of the vacuum insulation panel made of this core material is relatively low. At the same time, by adding a gas releasing agent in the present invention, during the process of manufacturing the composite core material, the gas releasing agent will decompose and release oxygen. During the release process of oxygen, oxygen will flow from inside the core material to the outside, and at the same time, it will partially oxidize the vegetable adhesive, thereby changing the closed pores formed during the pressing process into through holes. In this way, when vacuum pumping is carried out during the process of manufacturing a vacuum insulation panel using this composite core material, the number of closed pores is greatly reduced, thereby reducing the thermal conductivity of the vacuum insulation panel.

[0032] Among them, in step one, the ratio of expanded perlite, the adhesive, the gas releasing agent, and water is 100:2.5 - 7.5:15 - 30:100 - 250. The baking time of the baking equipment is 2h - 12h, and the baking temperature is 100°C - 300°C to achieve complete dehydration of the semi-finished composite core material. The mesh number of the expanded perlite is 70 mesh - 120 mesh. The holding pressure time is 2min - 4min when the pressing plate of the forming equipment presses down to pressurize and shape the materials in the forming cavity.

[0033] Furthermore, the gas releasing agent is an oxygen gas releasing agent. For example, the gas releasing agent is hydrogen peroxide, or the gas releasing agent is potassium permanganate. When hydrogen peroxide or potassium permanganate decomposes, it will release oxygen. During the release process of oxygen, at the same time, it will partially oxidize the vegetable adhesive, thereby changing the closed pores formed during the pressing process into through holes. When vacuum pumping is carried out during the process of manufacturing a vacuum insulation panel using this composite core material, the number of closed pores is greatly reduced, thereby reducing the thermal conductivity of the vacuum insulation panel.

[0034] In order to facilitate the demolding of the semi-finished composite core material made in step three, a first anti-sticking layer is provided on the surface of the forming cavity; a second anti-sticking layer is provided on the surface of the pressing plate.

[0035] The present invention also discloses a composite core material, which is made by the above-mentioned preparation method. The present invention also discloses a vacuum insulation panel, including a composite core material, an adsorbent, and a barrier bag. Among them, the composite core material is made by the above-mentioned preparation method, and the adsorbent and the composite core material are arranged together in the vacuum cavity of the barrier bag.

[0036] Example 1

[0037] A preparation method of a composite core material of the present invention includes the following steps:

[0038] Step 1: Place expanded perlite, adhesive, hydrogen peroxide, and water in proportion in a mixing device, and mix and stir well. Step 2: Place the material obtained in Step 1 in a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material, and the pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 1.

[0039] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of adhesive, 80 g of hydrogen peroxide, and 600 g of water. The composite core material 1 made in Example 1, after testing, the density of this composite core material 1 is 163 kg / m 3 , and the compressive strength is 0.35 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 1 is 4.3 mw / m.k.

[0040] Example 2

[0041] A preparation method of a composite core material of the present invention includes the following steps:

[0042] Step 1: Place expanded perlite, sesbania gum, hydrogen peroxide, and water in proportion in a mixing device, and mix and stir well. Step 2: Place the material obtained in Step 1 in a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material, and the pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 2.

[0043] Among them, in Step 1, there are 400 g of expanded perlite, 10 g of sesbania gum, 80 g of hydrogen peroxide, and 600 g of water. The composite core material 2 made in Example 2, after testing, the density of this composite core material 2 is 162 kg / m 3 , and the compressive strength is 0.25 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 2 is 4.1 mw / m.k.

[0044] Example 3

[0045] A preparation method of a composite core material of the present invention includes the following steps:

[0046] Step 1: Place expanded perlite, sesbania gum, hydrogen peroxide and water in a mixing device according to a proportion, and mix and stir well. Step 2: Place the material obtained in Step 1 in a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 3.

[0047] Among them, in Step 1, there are 400 g of expanded perlite, 30 g of sesbania gum, 80 g of hydrogen peroxide, and 600 g of water. For the composite core material 3 made in Example 3, after testing, the density of the composite core material 3 is 163 kg / m 3 , and the compressive strength is 0.32 MPa; the thermal conductivity of the vacuum insulation panel made of the composite core material 3 is 5.3 mw / m.k.

[0048] Example 4

[0049] A preparation method of a composite core material of the present invention includes the following steps:

[0050] Step 1: Place expanded perlite, sesbania gum, hydrogen peroxide and water in a mixing device according to a proportion, and mix and stir well. Step 2: Place the material obtained in Step 1 in a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 4.

[0051] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of sesbania gum, 60 g of hydrogen peroxide, and 600 g of water. For the composite core material 4 made in Example 4, after testing, the density of the composite core material 4 is 161 kg / m 3 , and the compressive strength is 0.31 MPa; the thermal conductivity of the vacuum insulation panel made of the composite core material 4 is 4.8 mw / m.k.

[0052] Example 5

[0053] A preparation method of a composite core material of the present invention includes the following steps:

[0054] Step 1: Place expanded perlite, sesbania gum, hydrogen peroxide, and water in a mixing device according to a ratio, and mix and stir well. Step 2: Place the material obtained in Step 1 into a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 5.

[0055] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of sesbania gum, 120 g of hydrogen peroxide, and 600 g of water. For the composite core material 5 made in Example 5, after testing, the density of this composite core material 5 is 162 kg / m 3 , and the compressive strength is 0.32 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 5 is 4.3 mw / m.k.

[0056] Example 6

[0057] A preparation method of a composite core material of the present invention includes the following steps:

[0058] Step 1: Place expanded perlite, sesbania gum, hydrogen peroxide, and water in a mixing device according to a ratio, and mix and stir well. Step 2: Place the material obtained in Step 1 into a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 6.

[0059] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of sesbania gum, 80 g of hydrogen peroxide, and 400 g of water. For the composite core material 6 made in Example 6, after testing, the density of this composite core material 6 is 161 kg / m 3 , and the compressive strength is 0.22 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 6 is 4.2 mw / m.k.

[0060] Example 7

[0061] A preparation method of a composite core material of the present invention includes the following steps:

[0062] Step 1: Place expanded perlite, sesbania gum, hydrogen peroxide, and water in a mixing device according to a ratio, and mix and stir well. Step 2: Place the material obtained in Step 1 into a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 7.

[0063] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of sesbania gum, 80 g of hydrogen peroxide, and 1000 g of water. For the composite core material 7 made in Example 7, after testing, the density of this composite core material 7 is 163 kg / m 3 , and the compressive strength is 0.38 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 7 is 5.1 mw / m.k.

[0064] Example 8

[0065] A preparation method of a composite core material of the present invention includes the following steps:

[0066] Step 1: Place expanded perlite, sesbania gum, potassium permanganate, and water in a mixing device according to a ratio, and mix and stir well. Step 2: Place the material obtained in Step 1 into a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 8.

[0067] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of sesbania gum, 80 g of potassium permanganate, and 600 g of water. For the composite core material 8 made in Example 8, after testing, the density of this composite core material 8 is 164 kg / m 3 , and the compressive strength is 0.35 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 8 is 5.5 mw / m.k.

[0068] Comparative Example 1

[0069] A preparation method of a composite core material of the present invention includes the following steps:

[0070] Step 1: Place expanded perlite, polyacrylamide, hydrogen peroxide, and water in a mixing device according to a ratio, and mix and stir well. Step 2: Place the material obtained in Step 1 into a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 9.

[0071] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of polyacrylamide, 80 g of hydrogen peroxide, and 600 g of water. For the composite core material 9 made in Comparative Example 1, after testing, the density of this composite core material 9 is 162 kg / m 3 , and the compressive strength is 0.12 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 9 is 5.1 mw / m.k.

[0072] Comparative Example 2

[0073] A preparation method of a composite core material of the present invention includes the following steps:

[0074] Step 1: Place expanded perlite, sesbania gum, and water in a mixing device according to a ratio, and mix and stir well. Step 2: Place the material obtained in Step 1 into a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 10.

[0075] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of sesbania gum, and 600 g of water. For the composite core material 10 made in Comparative Example 2, after testing, the density of this composite core material 10 is 161 kg / m 3 , and the compressive strength is 0.32 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 10 is 8.9 mw / m.k.

[0076] Comparative Example 3

[0077] A preparation method of a composite core material of the present invention includes the following steps:

[0078] Step 1: Place expanded perlite, water glass, hydrogen peroxide, and water in a mixing device in proportion, and mix and stir well. Step 2: Place the material obtained in Step 1 in a forming device, and quantitatively control the material to enter the forming cavity of the forming device according to the density and volume of the core material. Step 3: Set the pressure for the pressing plate of the forming device to press down according to the density and volume of the core material. The pressing plate of the forming device presses down to pressurize and shape the material in the forming cavity to form a semi-finished composite core material. Step 4: Demold and take out the semi-finished composite core material made in Step 3 for standby. Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it to form a finished composite core material 11.

[0079] Among them, in Step 1, there are 400 g of expanded perlite, 20 g of water glass, 80 g of hydrogen peroxide, and 600 g of water. For the composite core material 11 made in Comparative Example 3, after testing, the density of this composite core material 11 is 162 kg / m 3 , and the compressive strength is 0.33 MPa; the thermal conductivity of the vacuum insulation panel made of this composite core material 11 is 12.6 mw / m.k.

[0080] Make a table for Examples 1 to 8 and Comparative Examples 1 to 3, and the table is as follows.

[0081]

[0082] It can be seen from this table that when the ratio of expanded perlite, adhesive, gas releasing agent, and water is 100:2.5 - 7.5:15 - 30:100 - 250, the density of the composite core material made is less than 164 kg / m 3 , the density is relatively small, and the overall weight is relatively light. The compressive strength of the composite core material made is greater than 0.22 MPa, having a certain strength, so that it is not necessary to load the composite core material into a breathable and powder-impermeable bag for pressing and forming. After using the composite core material in Examples 1 to 8 to make a vacuum insulation panel, the thermal conductivity of this vacuum insulation panel is less than 5.5 mw / m.k, and the heat insulation effect of the vacuum insulation panel is good.

[0083] Compared with Example 1, in Comparative Example 1, polyacrylamide is used to replace sesbania gum, and the compressive strength of the composite core material made is 0.12 MPa, and the compressive strength is relatively low, resulting in the situation of cracking during the transfer or bagging of this composite core material.

[0084] Compared with Example 1, in Comparative Example 2, no gas releasing agent is added, so that when the composite core material is prepared, there is no oxygen to react with the oxidized vegetable adhesive, resulting in a relatively large number of closed pores in the made composite core material. After using this composite core material to make a vacuum insulation panel, the thermal conductivity of the vacuum insulation panel is 8.9 mw / m.k, and the thermal conductivity is relatively high, and the heat insulation effect is relatively poor.

[0085] Comparative Example 3 is compared with Example 1. In Comparative Example 3, sodium silicate is used to replace sesbania gum. Oxygen does not react with sodium silicate, resulting in a larger number of closed pores in the composite core material. After using this composite core material to make a vacuum insulation panel, the thermal conductivity of the vacuum insulation panel is 12.6 mw / m.k, which is relatively high and the heat insulation effect is poor.

[0086] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent transformations made by using the content of the specification of the present invention, directly or indirectly applied in the related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A method for preparing a composite core material, characterized in that: The following steps are involved: Step 1, placing expanded perlite, adhesive, gas release agent and water in a mixing device in proportion, mixing them thoroughly and stirring them evenly; Step 2, placing the material obtained in step 1 in a molding device, and controlling the material to enter a molding cavity of the molding device according to the density and volume of the core material; Step three, according to the density and volume of the core material, the pressing pressure of the pressing plate of the molding equipment is set, and the pressing plate of the molding equipment presses and shapes the material in the molding cavity to form a semi-finished composite core material; Step 4, demoulding the semi-finished composite core material made in step 3 and taking it out for use; Step 5: Place the semi-finished core material in a baking device for baking to dehydrate it and form a finished composite core material.

2. The method for preparing a composite core material according to claim 1, characterized in that: In step 1, the ratio of expanded perlite, adhesive, gas release agent and water is 100:2.5-7.5:15-30:100-250.

3. The method for preparing a composite core material according to claim 1, characterized in that: The gas release agent is an oxygen gas release agent.

4. The method for preparing a composite core material according to claim 1, characterized in that: The gas release agent is hydrogen peroxide or potassium permanganate.

5. The method for preparing a composite core material according to claim 1, characterized in that: The adhesive is a plant-based adhesive.

6. The method for preparing a composite core material according to claim 1, characterized in that: The baking time of the baking equipment is 2h-12h, and the baking temperature is 100℃-300℃.

7. The method for preparing a composite core material according to claim 1, characterized in that: The mesh number of expanded perlite is 70 mesh to 120 mesh.

8. The method for preparing a composite core material according to claim 1, characterized in that: The holding time when the pressing plate of the molding equipment presses down to pressurize the material in the molding cavity is 2min-4min.

9. A composite core material, characterized in that: The method is prepared according to any one of claims 1 to 8.

10. A vacuum insulation panel, comprising a composite core material, an adsorbent and a barrier bag, characterized in that: The composite core material is made by the preparation method described in any one of claims 1 to 8, and the adsorbent and the composite core material are arranged together in the vacuum cavity of the barrier bag.

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