Preparation process of nanopore aerogel heat insulation coating

Abstract

The invention relates to the technical field of thermal insulation coatings, and discloses a preparation process of a nanopore aerogel thermal insulation coating, which comprises the following steps: S1, preparing materials: 10-15 parts of modified silicon dioxide aerogel, 2-8 parts of deionized water, 3-6 parts of absolute ethyl alcohol, 8-12 parts of a catalyst, 5-7 parts of an n-hexane solvent, 2-6 parts of a dispersing agent and 2-4 parts of a defoaming agent. According to the preparation method, structural collapse of the silicon dioxide aerogel in the application process can be avoided, the heat insulation and heat preservation performance and mechanical performance of the aerogel heat insulation and heat preservation coating are remarkably improved, the heat insulation and heat preservation performance and mechanical performance of the aerogel heat insulation and heat preservation coating can be further improved, and the adhesion capacity of the coating is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation coatings, in particular to a preparation process of a nanoporous aerogel thermal insulation coating. Background Art

[0002] Thermal insulation coatings achieve thermal insulation through coatings with low thermal conductivity and high thermal resistance. Building insulation mainly takes measures on the interior and exterior protective structures of the building to reduce the amount of indoor heat dissipated to the outdoors, which plays an important role in creating a suitable indoor thermal environment and saving energy.

[0003] Aerogel is a lightweight nanoporous material. Its internal nanoporous network structure enables it to effectively limit solid-state heat conduction and gaseous heat conduction, so it has excellent thermal insulation properties. As a lightweight and efficient thermal insulation material, it has a wide range of applications in aerospace, chemical industry, metallurgy, energy-saving construction and other fields.

[0004] However, due to the fragility and poor continuity of the nano-skeleton of aerogel, its mechanical properties are poor and the network structure is prone to collapse, which affects the thermal insulation effect and greatly limits its application scope, resulting in poor aerogel use effect. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the shortcomings of the prior art, the present invention provides a preparation process for a nanoporous aerogel thermal insulation coating, which is mainly used to solve the problem that the nano-skeleton of the existing aerogel is fragile and has poor continuity, resulting in poor mechanical properties and easy collapse of the network structure, which affects the thermal insulation effect, greatly limits its application scope, and leads to poor aerogel use effect.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A preparation process of a nanoporous aerogel thermal insulation coating comprises the following steps:

[0010] S1: Prepare materials, including 10-15 parts of modified silica aerogel, 2-8 parts of deionized water, 3-6 parts of anhydrous ethanol, 8-12 parts of catalyst, 5-7 parts of n-hexane solvent, 2-6 parts of dispersant and 2-4 parts of defoamer;

[0011] S2: mixing, adding the modified silica aerogel, deionized water and anhydrous ethanol into a mixer and stirring and mixing to obtain a mixed solution;

[0012] S3: Catalysis, adding the catalyst, dispersant and defoamer into the mixed solution, mixing them evenly, and then standing at room temperature for 30-40 minutes to obtain an aerogel piece;

[0013] S4: Aging, heating the gel piece in S3 to 70-75°C for 30-60 hours to obtain an aged aerogel piece;

[0014] S5: crushing, adding the aged aerogel pieces into a crusher, crushing at a speed of 1200-1600 r / min for 10-15 min to obtain aerogel particles;

[0015] S6: Fusion, adding the aerogel particles and n-hexane solvent in S5 into a mixing drum for stirring and mixing, and dispersing the free gel particles in the crushed aerogel in the n-hexane solvent to obtain an aerogel mixed liquid;

[0016] S7: spraying, spraying the aerogel mixture in S6 on the object to be sprayed, and after combustion, the aerogel particles will be deposited on the object to be sprayed to form a nanoporous aerogel thermal insulation coating.

[0017] Furthermore, the modified silica aerogel is boron oxide modified silica aerogel, and the precursor of the boron oxide is boron carbonate.

[0018] On the basis of the above scheme, the preparation method of the modified silica aerogel is: mixing the precursor of boron oxide and the silica aerogel, calcining, crushing, mixing with a polyvinyl alcohol aqueous solution, and drying to obtain the modified silica aerogel.

[0019] As a further embodiment of the present invention, the catalyst includes an acidic catalyst and an alkaline catalyst, and when the catalyst is added to the mixed solution, the pH value of the mixed solution needs to be adjusted to neutral.

[0020] Furthermore, the acidic catalyst is any one of hydrochloric acid, sulfuric acid, nitric acid, acetic acid, and oxalic acid.

[0021] Based on the above scheme, the alkaline catalyst is any one of ammonia water, lithium hydroxide and sodium hydroxide.

[0022] As a further solution of the present invention, the dispersant is one or more of BYK162, BYK190, and BYK110, and the defoaming agent is silicone defoaming agent.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the present invention provides a preparation process of a nanoporous aerogel thermal insulation coating, which has the following beneficial effects:

[0025] 1. The present invention wraps boron oxide on the surface of silica aerogel to increase the structural stability of silica aerogel and avoid structural collapse of silica aerogel during application. At the same time, boron oxide has low thermal conductivity and excellent high-temperature stability. Boron oxide and silica aerogel work together to significantly improve the thermal insulation and mechanical properties of the aerogel thermal insulation coating.

[0026] 2. The nanoporous aerogel thermal insulation coating prepared by the present invention has a simple process, a high degree of automation, and is easy to use. At the same time, the prepared nanoporous aerogel thermal insulation coating has the advantages of high viscosity and stability.

[0027] 3. The present invention increases the dispersibility and bonding degree of the aerogel and the epoxy acrylate resin matrix by mixing the boron oxide-modified silica aerogel and the polyvinyl alcohol aqueous solution, further improves the thermal insulation and mechanical properties of the aerogel thermal insulation coating, and also improves the adhesion ability of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the process structure of a preparation process of a nanoporous aerogel thermal insulation coating proposed in the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] Reference Figure 1 A process for preparing a nanoporous aerogel thermal insulation coating comprises the following steps:

[0032] S1: Prepare materials, including 10 parts of modified silica aerogel, 2 parts of deionized water, 3 parts of anhydrous ethanol, 8 parts of catalyst, 5 parts of n-hexane solvent, 2 parts of dispersant and 2 parts of defoamer. By wrapping boron oxide on the surface of silica aerogel, the structural stability of silica aerogel is increased to avoid structural collapse of silica aerogel during application. Meanwhile, boron oxide has low thermal conductivity and excellent high-temperature stability. Boron oxide and silica aerogel work together to significantly improve the thermal insulation and mechanical properties of aerogel thermal insulation coating.

[0033] S2: mixing, adding the modified silica aerogel, deionized water and anhydrous ethanol into a mixer and stirring and mixing to obtain a mixed solution;

[0034] S3: Catalysis, adding the catalyst, dispersant and defoamer into the mixed solution, mixing them evenly, and then standing at room temperature for 30 minutes to obtain an aerogel piece;

[0035] S4: Aging, heating the gel piece in S3 to 75°C for 30 hours to obtain an aged aerogel piece;

[0036] S5: crushing, adding the aged aerogel pieces into a crusher, crushing at a speed of 1200 r / min for 15 min to obtain aerogel particles;

[0037] S6: Fusion, adding the aerogel particles and n-hexane solvent in S5 into a mixing drum for stirring and mixing, and dispersing the free gel particles in the crushed aerogel in the n-hexane solvent to obtain an aerogel mixed liquid;

[0038] S7: spraying, spraying the aerogel mixture in S6 on the object to be sprayed, and after combustion, the aerogel particles will be deposited on the object to be sprayed to form a nanoporous aerogel thermal insulation coating. The prepared nanoporous aerogel thermal insulation coating has a simple process, a high degree of automation, and is easy to use. At the same time, the prepared nanoporous aerogel thermal insulation coating has the advantages of high viscosity and stability.

[0039] In the present invention, the modified silica aerogel is boron oxide modified silica aerogel, the precursor of boron oxide is boron carbonate, and the preparation method of the modified silica aerogel is: the precursor of boron oxide and silica aerogel are mixed, calcined, crushed, mixed with polyvinyl alcohol aqueous solution, and dried to obtain modified silica aerogel, and the dispersibility and bonding degree of aerogel and epoxy acrylate resin matrix are increased by mixing the boron oxide modified silica aerogel and polyvinyl alcohol aqueous solution, so as to further improve the thermal insulation and mechanical properties of the aerogel thermal insulation coating, and also improve the adhesion ability of the coating, and the catalyst includes an acidic catalyst and an alkaline catalyst, and when the catalyst is added to the mixed solution, the pH value of the mixed solution needs to be adjusted to neutral, the acidic catalyst is oxalic acid, the alkaline catalyst is sodium hydroxide, the dispersant is BYK162, BYK110, and the defoamer is silicone defoamer.

[0040] Example 2

[0041] Reference Figure 1 A process for preparing a nanoporous aerogel thermal insulation coating comprises the following steps:

[0042] S1: Prepare materials, including 12 parts of modified silica aerogel, 7 parts of deionized water, 4 parts of anhydrous ethanol, 9 parts of catalyst, 6 parts of n-hexane solvent, 5 parts of dispersant and 3 parts of defoamer. By wrapping boron oxide on the surface of silica aerogel, the structural stability of silica aerogel is increased to avoid structural collapse of silica aerogel during application. Meanwhile, boron oxide has low thermal conductivity and excellent high-temperature stability. Boron oxide and silica aerogel work together to significantly improve the thermal insulation and mechanical properties of aerogel thermal insulation coating.

[0043] S2: mixing, adding the modified silica aerogel, deionized water and anhydrous ethanol into a mixer and stirring and mixing to obtain a mixed solution;

[0044] S3: Catalysis, adding the catalyst, dispersant and defoamer into the mixed solution and mixing them evenly, and then standing at room temperature for 35 minutes to obtain an aerogel piece;

[0045] S4: Aging, heating the gel piece in S3 to 73°C for 50 hours to obtain an aged aerogel piece;

[0046] S5: crushing, adding the aged aerogel pieces into a crusher, crushing at a speed of 1500 r / min for 13 min to obtain aerogel particles;

[0047] S6: Fusion, adding the aerogel particles and n-hexane solvent in S5 into a mixing drum for stirring and mixing, and dispersing the free gel particles in the crushed aerogel in the n-hexane solvent to obtain an aerogel mixed liquid;

[0048] S7: spraying, spraying the aerogel mixture in S6 on the object to be sprayed, and after combustion, the aerogel particles will be deposited on the object to be sprayed to form a nanoporous aerogel thermal insulation coating. The prepared nanoporous aerogel thermal insulation coating has a simple process, a high degree of automation, and is easy to use. At the same time, the prepared nanoporous aerogel thermal insulation coating has the advantages of high viscosity and stability.

[0049] In the present invention, the modified silica aerogel is boron oxide modified silica aerogel, the precursor of boron oxide is boron carbonate, and the preparation method of the modified silica aerogel is: the precursor of boron oxide and silica aerogel are mixed, calcined, crushed, mixed with polyvinyl alcohol aqueous solution, and dried to obtain modified silica aerogel, and the dispersibility and bonding degree of aerogel and epoxy acrylate resin matrix are increased by mixing the boron oxide modified silica aerogel and polyvinyl alcohol aqueous solution, so as to further improve the thermal insulation and mechanical properties of the aerogel thermal insulation coating, and also improve the adhesion ability of the coating, and the catalyst includes an acidic catalyst and an alkaline catalyst, and when the catalyst is added to the mixed solution, the pH value of the mixed solution needs to be adjusted to neutral, the acidic catalyst is nitric acid, the alkaline catalyst is lithium hydroxide, the dispersant is BYK162, BYK190, and the defoamer is silicone defoamer.

[0050] Example 3

[0051] Reference Figure 1 A process for preparing a nanoporous aerogel thermal insulation coating comprises the following steps:

[0052] S1: Prepare materials, including 15 parts of modified silica aerogel, 8 parts of deionized water, 6 parts of anhydrous ethanol, 12 parts of catalyst, 7 parts of n-hexane solvent, 6 parts of dispersant and 4 parts of defoamer. By wrapping boron oxide on the surface of silica aerogel, the structural stability of silica aerogel is increased to avoid structural collapse of silica aerogel during application. Meanwhile, boron oxide has low thermal conductivity and excellent high-temperature stability. Boron oxide and silica aerogel work together to significantly improve the thermal insulation and mechanical properties of aerogel thermal insulation coating.

[0053] S2: mixing, adding the modified silica aerogel, deionized water and anhydrous ethanol into a mixer and stirring and mixing to obtain a mixed solution;

[0054] S3: Catalysis, adding the catalyst, dispersant and defoamer into the mixed solution, mixing them evenly, and then standing at room temperature for 40 minutes to obtain an aerogel piece;

[0055] S4: Aging, heating the gel piece in S3 to 70°C for 60 hours to obtain an aged aerogel piece;

[0056] S5: crushing, adding the aged aerogel pieces into a crusher, crushing at a speed of 1600 r / min for 10 min to obtain aerogel particles;

[0057] S6: Fusion, adding the aerogel particles and n-hexane solvent in S5 into a mixing drum for stirring and mixing, and dispersing the free gel particles in the crushed aerogel in the n-hexane solvent to obtain an aerogel mixed liquid;

[0058] S7: spraying, spraying the aerogel mixture in S6 on the object to be sprayed, and after combustion, the aerogel particles will be deposited on the object to be sprayed to form a nanoporous aerogel thermal insulation coating. The prepared nanoporous aerogel thermal insulation coating has a simple process, a high degree of automation, and is easy to use. At the same time, the prepared nanoporous aerogel thermal insulation coating has the advantages of high viscosity and stability.

[0059] In the present invention, the modified silica aerogel is boron oxide modified silica aerogel, the precursor of boron oxide is boron carbonate, and the preparation method of the modified silica aerogel is: the precursor of boron oxide and silica aerogel are mixed, calcined, crushed, mixed with polyvinyl alcohol aqueous solution, and dried to obtain modified silica aerogel, and the dispersibility and bonding degree of aerogel and epoxy acrylate resin matrix are increased by mixing the silica aerogel modified by boron oxide with the polyvinyl alcohol aqueous solution, so as to further improve the thermal insulation and mechanical properties of the aerogel thermal insulation coating, and also improve the adhesion ability of the coating, and the catalyst includes an acidic catalyst and an alkaline catalyst, and when the catalyst is added to the mixed solution, the pH value of the mixed solution needs to be adjusted to neutral, the acidic catalyst is hydrochloric acid, the alkaline catalyst is ammonia water, the dispersant is BYK162, BYK190, BYK110, and the defoamer is silicone defoamer.

[0060] In the description of this article, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A process for preparing a nanoporous aerogel thermal insulation coating, characterized in that: The following steps are involved: S1: Prepare materials, including 10-15 parts of modified silica aerogel, 2-8 parts of deionized water, 3-6 parts of anhydrous ethanol, 8-12 parts of catalyst, 5-7 parts of n-hexane solvent, 2-6 parts of dispersant and 2-4 parts of defoamer; S2: mixing, adding the modified silica aerogel, deionized water and anhydrous ethanol into a mixer and stirring and mixing to obtain a mixed solution; S3: Catalysis, adding the catalyst, dispersant and defoamer into the mixed solution, mixing them evenly, and then standing at room temperature for 30-40 minutes to obtain an aerogel piece; S4: Aging, heating the gel piece in S3 to 70-75°C for 30-60 hours to obtain an aged aerogel piece; S5: crushing, adding the aged aerogel pieces into a crusher, crushing at a speed of 1200-1600 r / min for 10-15 min to obtain aerogel particles; S6: Fusion, adding the aerogel particles and n-hexane solvent in S5 into a mixing drum for stirring and mixing, and dispersing the free gel particles in the crushed aerogel in the n-hexane solvent to obtain an aerogel mixed liquid; S7: spraying, spraying the aerogel mixture in S6 on the object to be sprayed, and after combustion, the aerogel particles will be deposited on the object to be sprayed to form a nanoporous aerogel thermal insulation coating.

2. The process for preparing a nanoporous aerogel thermal insulation coating according to claim 1, characterized in that: The modified silica aerogel is boron oxide modified silica aerogel, and the precursor of the boron oxide is boron carbonate.

3. The preparation process of a nanoporous aerogel thermal insulation coating according to claim 1, characterized in that: The preparation method of the modified silica aerogel comprises: mixing a boron oxide precursor and silica aerogel, calcining, crushing, mixing with a polyvinyl alcohol aqueous solution, and drying to obtain the modified silica aerogel.

4. The process for preparing a nanoporous aerogel thermal insulation coating according to claim 1, characterized in that: The catalyst includes an acidic catalyst and an alkaline catalyst. When the catalyst is added to the mixed solution, the pH value of the mixed solution needs to be adjusted to neutral.

5. The process for preparing a nanoporous aerogel thermal insulation coating according to claim 1, characterized in that: The acidic catalyst is any one of hydrochloric acid, sulfuric acid, nitric acid, acetic acid, and oxalic acid.

6. The process for preparing a nanoporous aerogel thermal insulation coating according to claim 5, characterized in that: The alkaline catalyst is any one of ammonia water, lithium hydroxide and sodium hydroxide.

7. The process for preparing a nanoporous aerogel thermal insulation coating according to claim 1, characterized in that: The dispersant is one or more of BYK162, BYK190, and BYK110, and the defoamer is an organic silicon defoamer.

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