Aerogel slurry, production method and application thereof

Abstract

The invention discloses aerogel slurry as well as a production method and application thereof. The production method comprises the following steps: firstly, preparing aerogel microsphere particles, silicon microsphere ink particles and polymer slurry step by step, and mixing the aerogel microsphere particles and the silicon microsphere ink particles with the polymer slurry to prepare the aerogel slurry. The prepared aerogel slurry is coated with multiple layers of aerogel slurry in the modes of brush coating, roll coating, spray coating and the like, and the aerogel coating is prepared. The preparation method of the aerogel slurry is scientific and reasonable in process, simple and convenient to operate and short in preparation period, meanwhile, only water is used as a solvent in the preparation process of the aerogel slurry, no organic solvent is used in the whole process, the cost is low, the aerogel slurry is green and safe, and a product is stable in structure, uniform in internal structure, lighter and more environmentally friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal insulation and cold insulation energy-saving and carbon reduction materials, in particular to an aerogel slurry, a production method and application thereof. BACKGROUND

[0002] Aerogel is a solid material with a nano-multiple aperture network structure. It is known as the world's lightest solid material due to its extremely small density, and is also known as "frozen smoke", "miraculous material changing the world" and "ultimate thermal insulation material". Aerogel has outstanding properties in thermal insulation, fire resistance, sound insulation, optics and mechanics due to its fine nano-porous structure and high specific surface area, and is one of the top ten new materials changing the world. The production process of aerogel material is safe, environmentally friendly and non-toxic.

[0003] At present, the general preparation process of ordinary aerogel is: raw material dispersion-synthesis stirring-automatic packaging. The preparation process is relatively simple, and the prepared aerogel has the problems of unqualified thermal conductivity, poor bonding strength and poor water resistance. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the defects of the above-mentioned technology, and to provide an aerogel slurry, a production method and application thereof.

[0005] To solve the above technical problems, the technical solution provided by the present application is an aerogel slurry, a production method and application thereof:

[0006] An aerogel slurry production method, comprising the following steps:

[0007] S1. Put the silica gel into a supercritical fluid drying dry compression container, reduce the temperature and make CO2 pass in to reach liquid-gas two-phase balance, then increase the temperature at a certain rate to reach the critical state, convert the liquid in the gel pores into critical liquid, slowly release CO2 fluid until it reaches room temperature at normal pressure, and obtain silica aerogel solid;

[0008] S2. Disperse the prepared silica aerogel solid to obtain aerogel microsphere particles with a diameter of less than 100 pm and silica microsphere particles with a diameter of less than 200 pm;

[0009] S3. According to the performance and application requirements of the storage tank special aerogel, mix acrylic ester emulsion, water-based resin, dispersing agent, thickening agent, adhesive and glass microbeads to prepare a polymer slurry;

[0010] S4. Mix the aerogel microsphere particles and silica microsphere particles with the polymer slurry to prepare an aerogel slurry.

[0011] Furthermore, the silica gel is placed in a supercritical fluid drying dry pressure vessel and dried using supercritical carbon dioxide at a temperature of 35℃-55℃ and a pressure of 7mp-20mp.

[0012] In the mixing step of preparing polymer slurry, the polymer slurry is mixed by mechanical stirring or peristaltic stirring, the stirring blade speed is 3000-5000 r / min, and the mechanical stirring or peristaltic stirring time is 15 min-30 min;

[0013] When the aerogel microspheres and silicon microspheres are mixed with the polymer slurry, mechanical stirring or peristaltic stirring is used. The stirring blade speed is 3000-5000 r / min, and the stirring time is 15-30 min.

[0014] Furthermore, before the step of mixing the aerogel microspheres and silicon microspheres with the polymer slurry using mechanical stirring or peristaltic stirring, the method further includes a step of adding the aerogel microspheres and silicon microspheres to the polymer slurry by direct addition or spraying.

[0015] Furthermore, after thoroughly mixing and stirring the aerogel microspheres and silicon microspheres with the polymer slurry, the mixture is added to a reaction vessel for further reaction and synthesis, with a reaction time of 2-4 hours.

[0016] Furthermore, the volume ratio of the polymer slurry, aerogel microspheres, and silicon microspheres is 1:(2-5).

[0017] Furthermore, it also includes a step of preparing aerogel powder, which includes: mixing a silicon source, water and an alcohol solvent to prepare a silicon gel, and then drying it to prepare an aerogel solid; dispersing the aerogel solid to prepare aerogel microspheres and silicon microspheres, wherein the silicon source, alcohol solvent and water are mixed in a molar ratio of 1:(5-10):(5-15).

[0018] Furthermore, before the step of dispersing the aerogel solid, the method further includes: heat-treating the aerogel solid at 450℃-750℃ for 1h-4h.

[0019] An aerogel slurry, said aerogel slurry being prepared by any of the aerogel slurry production methods described above.

[0020] An application of an aerogel slurry, wherein the aerogel slurry is the aforementioned aerogel slurry, and according to actual needs, the prepared aerogel slurry is coated in multiple layers by brushing, rolling, spraying or other methods to perform cold insulation, heat insulation and energy-saving carbon application, so that the aerogel slurry is uniformly adhered to the surface of the substrate to prepare an aerogel coating.

[0021] The advantages of this invention compared to existing technologies are as follows: the preparation method of the aerogel slurry in this invention is scientifically sound, simple to operate, and has a short preparation cycle. Furthermore, the aerogel slurry preparation process uses only water as a solvent, without the use of organic solvents, resulting in lower costs and greater environmental friendliness. The product also exhibits stable structure, uniform internal structure, and is lighter and more environmentally friendly. Therefore, it addresses several shortcomings of existing technologies: 1) it solves the problem of losses caused by frequent replacements of traditional tank-specific insulation materials due to poor water resistance and bonding strength; 2) it solves the problem of poor insulation performance in traditional tank-specific materials, leading to significant cooling or heat loss; 3) it solves the problem of poor insulation performance in traditional tank-specific materials, resulting in frequent tank breathing, significant oil and gas loss, and environmental pollution; 4) the aerogel slurry product has a very low thermal conductivity, allowing for thin and lightweight insulation solutions, reducing space waste and enhancing safety. Detailed Implementation

[0022] Example 1: An aerogel slurry, its production method, and its application:

[0023] A method for producing aerogel slurry includes the following steps:

[0024] S1. Place the silica gel in a supercritical fluid drying dry pressure container, lower its temperature and introduce CO2 to achieve liquid-gas two-phase equilibrium, then raise the temperature at a certain rate to reach the critical state, so that all the liquid in the gel pores is converted into the critical liquid, and slowly release the CO2 fluid until the ambient pressure and room temperature are reached to obtain silica aerogel solid.

[0025] S2. The prepared silica aerogel solid is dispersed to obtain aerogel microspheres with a diameter of less than 100 μm and silica microsphere ink particles with a diameter of less than 200 μm.

[0026] S3. Based on the required performance and application requirements of the storage tank-specific aerogel, an acrylic emulsion, an aqueous resin, a dispersant, a thickener, an adhesive, and glass microspheres are mixed to prepare a polymer slurry;

[0027] S4. The aerogel microspheres and silicon microspheres are mixed with polymer slurry to prepare aerogel slurry.

[0028] In this embodiment, the silica gel is placed in a supercritical fluid drying dry pressure vessel and dried using supercritical carbon dioxide. The temperature of supercritical carbon dioxide drying is 35℃-55℃ and the pressure is 7mp-20mp.

[0029] In the mixing step of preparing polymer slurry, the polymer slurry is mixed by mechanical stirring or peristaltic stirring, the stirring blade speed is 3000-5000 r / min, and the mechanical stirring or peristaltic stirring time is 15 min-30 min;

[0030] When the aerogel microspheres and silicon microspheres are mixed with the polymer slurry, mechanical stirring or peristaltic stirring is used. The stirring blade speed is 3000-5000 r / min, and the stirring time is 15-30 min.

[0031] In this embodiment, before the step of mixing the aerogel microspheres and silicon microspheres with the polymer slurry by mechanical stirring or peristaltic stirring, the method further includes a step of adding the aerogel microspheres and silicon microspheres to the polymer slurry by direct addition or spraying.

[0032] In this embodiment, after the aerogel microsphere particles and silicon microsphere ink particles are thoroughly mixed and stirred with the polymer slurry, they are put into the reaction vessel to continue the reaction and synthesis for 2-4 hours.

[0033] In this embodiment, the volume ratio of the polymer slurry, aerogel microspheres, and silicon microspheres is 1:(2-5).

[0034] In this embodiment, the preparation step of aerogel powder is also included. The preparation step of aerogel powder includes: mixing silicon source, water and alcohol solvent to prepare silicon gel, and then drying it to prepare aerogel solid; dispersing the aerogel solid to prepare aerogel microsphere particles and silicon microsphere ink particles, wherein the silicon source, alcohol solvent and water are mixed in a molar ratio of 1:(5-10):(5-15).

[0035] In this embodiment, before the step of dispersing the aerogel solid, the method further includes: heat-treating the aerogel solid at 450℃-750℃ for 1h-4h.

[0036] An aerogel slurry, said aerogel slurry being prepared by any of the methods described above. The aerogel slurry is suitable for a temperature range of -80°C to 200°C.

[0037] The relevant test parameters of the prepared aerogel slurry are shown in the table below:

[0038]

[0039]

[0040] The relevant testing parameters for common aerogels are shown in the table below:

[0041] Serial number Detection item Detection basis Index requirement Detection result One-way judgment 1 Thermal conductivity coefficient / [W / (m.K)] GB / T25261-2018 ≤0.03 0.045 Unqualified 2 VOC content / (g / L) GB / T23986-2009 ≤100 88 Qualified 3 Bonding strength HG / T4567-2013 ≥0.4 0.25 Unqualified 4 Alkali resistance (48h) GB / T9265-2009 No abnormality No abnormality Qualified 5 Water resistance (96h) GB / T1733-1993 No abnormality Abnormality Unqualified

[0042] In this embodiment, according to actual needs, the prepared aerogel slurry is coated in multiple layers by brushing, rolling, spraying, etc., for cold insulation, heat insulation and energy-saving carbon application, so that the aerogel slurry is uniformly attached to the surface of the substrate, and an aerogel coating can be prepared.

[0043] The present invention and its embodiments have been described above. This description is not restrictive. If any person skilled in the art is inspired by this description and designs similar embodiments and examples without departing from the spirit of the present invention, such embodiments and examples should be included within the protection scope of the present invention.

Claims

1. A method for producing aerogel slurry, characterized in that... Includes the following steps: S1. Place the silica gel in a supercritical fluid drying dry pressure container, lower its temperature and introduce CO2 to achieve liquid-gas two-phase equilibrium, then raise the temperature at a certain rate to reach the critical state, so that all the liquid in the gel pores is converted into the critical liquid, and slowly release the CO2 fluid until the ambient pressure and room temperature are reached to obtain silica aerogel solid. S2. The prepared silica aerogel solid is dispersed to obtain aerogel microspheres with a diameter of less than 100 μm and silica microsphere ink particles with a diameter of less than 200 μm. S3. Based on the required performance and application requirements of the storage tank-specific aerogel, an acrylic emulsion, an aqueous resin, a dispersant, a thickener, an adhesive, and glass microspheres are mixed to prepare a polymer slurry; S4. The aerogel microspheres and silicon microspheres are mixed with polymer slurry to prepare aerogel slurry.

2. The method for producing aerogel slurry according to claim 1, characterized in that: The silica gel was placed in a supercritical fluid drying dry pressure vessel and dried using supercritical carbon dioxide at a temperature of 35℃-55℃ and a pressure of 7mp-20mp. In the mixing step of preparing polymer slurry, the polymer slurry is mixed by mechanical stirring or peristaltic stirring, the stirring blade speed is 3000-5000 r / min, and the mechanical stirring or peristaltic stirring time is 15 min-30 min; When the aerogel microspheres and silicon microspheres are mixed with the polymer slurry, mechanical stirring or peristaltic stirring is used. The stirring blade speed is 3000-5000 r / min, and the stirring time is 15-30 min.

3. The method for producing aerogel slurry according to claim 2, characterized in that: Before the step of mixing the aerogel microspheres and silicon microspheres with the polymer slurry by mechanical stirring or peristaltic stirring, the method further includes a step of adding the aerogel microspheres and silicon microspheres to the polymer slurry by direct addition or spraying.

4. The method for producing aerogel slurry according to claim 1, characterized in that: After thoroughly mixing and stirring the aerogel microspheres and silicon microspheres with the polymer slurry, the mixture is added to a reactor for further reaction and synthesis, with a reaction time of 2-4 hours.

5. The method for producing aerogel slurry according to claim 1, characterized in that: The volume ratio of the polymer slurry, aerogel microspheres, and silicon microspheres is 1:(2-5).

6. The method for producing aerogel slurry according to claim 1, characterized in that: It also includes a step for preparing aerogel powder, which includes: mixing a silicon source, water and an alcohol solvent to prepare a silicon gel, and then drying it to prepare an aerogel solid; dispersing the aerogel solid to prepare aerogel microspheres and silicon microspheres, wherein the silicon source, alcohol solvent and water are mixed in a molar ratio of 1:(5-10):(5-15).

7. The method for producing an aerogel slurry according to claim 6, characterized in that: Before the step of dispersing the aerogel solid, the method further includes: heat-treating the aerogel solid at 450℃-750℃ for 1h-4h.

8. An aerogel slurry, characterized in that: The aerogel slurry is prepared by an aerogel slurry production method according to any one of claims 1-7.

9. An application of an aerogel slurry, characterized in that: The aerogel slurry is the aerogel slurry according to claim 8. According to actual needs, the prepared aerogel slurry is coated in multiple layers by brushing, rolling, spraying or other methods to carry out cold insulation, heat insulation and energy saving carbon application, so that the aerogel slurry is uniformly attached to the surface of the substrate to prepare an aerogel coating.

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