Device for improving hydrophobicity of silicon dioxide aerogel

Abstract

The utility model relates to the field of aerogel production and processing, in particular to a silicon dioxide aerogel hydrophobicity improving device which comprises a reaction kettle, a plurality of supporting legs are fixedly connected to the surface of the reaction kettle, and the supporting legs are annularly and uniformly distributed along the surface of the reaction kettle; the mixing mechanism is mounted in the reaction kettle, and the upper end of the mixing mechanism extends to the upper part of the reaction kettle; wherein the mixing mechanism comprises a servo motor mounted at the upper end of the reaction kettle, and an output shaft of the servo motor penetrates into the reaction kettle and is connected with a material stirring assembly; materials at the bottom of the reaction kettle are guided to the upper part through the guide round pipe, and are guided out to the rotating rod through the guide outlet under the guide action of the guide arc plate, so that the materials at the bottom are turned to the upper part of a mixed liquid level in the reaction kettle, the mixing effect is improved in an auxiliary manner, and the mixing effect of modification treatment is guaranteed; the processing efficiency of hydrophobic modification of the aerogel is improved.

Description

Technical Field

[0001] This utility model relates to the field of aerogel production and processing, and in particular to a device for improving the hydrophobicity of silica aerogel. Background Technology

[0002] Silica (SiO2) aerogel is a material with unique properties, one of which is hydrophobicity. The hydrophobicity of SiO2 aerogel mainly comes from its surface modification treatment. During the preparation process, hydrophobic groups are attached to the surface of the aerogel through chemical reaction, thereby eliminating the hydroxyl groups (-OH) on its surface and endowing it with hydrophobicity.

[0003] Surface post-treatment is a common technique for improving the hydrophobicity of silica aerogels. It involves selecting dried hydrophilic silica aerogels as the modification target and choosing appropriate hydrophobic modifiers based on the modification requirements. Commonly used hydrophobic modifiers include methyltrimethoxysilane, trimethylchlorosilane, dimethylchlorosilane, and hexamethyldisilazane. These modifiers possess hydrophobic groups capable of reacting with hydroxyl groups on the aerogel surface.

[0004] The pretreated aerogel sample is placed in a sealed container, and then the selected hydrophobic modifier is injected into the container. Under appropriate temperature and humidity conditions, the modifier reacts with the hydroxyl groups on the surface of the aerogel. This step requires control of the reaction time and temperature to ensure that the reaction proceeds fully. After the reaction is complete, the aerogel sample is removed and dried.

[0005] A search of existing technology revealed a "reactor for producing silica aerogel" (publication number CN220715849U). This device scrapes away the raw materials adhering to the inner wall and bottom of the reaction vessel, thereby achieving thorough mixing and enhancing the strength and brittleness of the subsequent silica aerogel. However, when modifying aerogel raw materials with low density, the aerogel floats above the modifier, causing stratification, which affects the mixing effect of the modification process and reduces the processing efficiency of hydrophobic modification of the aerogel.

[0006] Therefore, a device for improving the hydrophobicity of silica aerogel is proposed to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a device for improving the hydrophobicity of silica aerogel in order to solve the above-mentioned problems. This device improves the problem that when modifying aerogel raw materials with low density, the aerogel will float on top of the modifier and cause stratification, which affects the mixing effect of the modification process and reduces the processing efficiency of hydrophobic modification of aerogel.

[0008] This utility model achieves the above-mentioned objective through the following technical solution: a device for improving the hydrophobicity of silica aerogel, comprising: a reaction vessel, wherein multiple support legs are fixedly connected to the surface of the reaction vessel, and the multiple support legs are uniformly distributed in a ring along the surface of the reaction vessel; a mixing mechanism, wherein the mixing mechanism is installed inside the reaction vessel, and the upper end of the mixing mechanism extends above the reaction vessel; wherein the mixing mechanism includes a servo motor installed at the upper end of the reaction vessel, the output shaft of the servo motor passing through the interior of the reaction vessel and connected to a material actuating component, the material actuating component being installed inside the reaction vessel, and multiple material guiding components being installed on the surface of the material actuating component. Silica aerogel itself is a porous solid material. During surface post-treatment, modifiers are usually coated or impregnated onto the surface of the aerogel in the form of a solution. At this time, the modifier is in a liquid state, while the silica aerogel maintains its solid state.

[0009] Preferably, the material guiding assembly includes a fluid guiding protrusion fixedly connected to the inner wall of the reactor. A guide tube is embedded in the surface of the fluid guiding protrusion away from the inner wall of the reactor. A guide arc plate is fixedly connected to the inner wall of the guide arc plate, and a rotating shaft is fixedly connected to the inner wall of the guide arc plate. A blade is fixedly connected to the lower end of the rotating shaft. When the blade rotates, it can guide the material at the bottom of the reactor upward through the guide tube.

[0010] Preferably, the upper end of the rotating shaft extends through the top of the guide tube and is fixedly connected to a spur gear, which meshes with the surface of the material actuation assembly.

[0011] Preferably, the material actuation assembly includes a partition fixedly connected to the inner wall of the reactor, the partition fixedly connected to the upper end of a guide tube, a rotating rod rotatably connected to the inner wall of the partition, and a gear disk fixedly connected to the surface of the rotating rod, the gear disk being located above the partition. As the reaction proceeds, the active ingredients in the modifier react with active groups such as hydroxyl groups on the aerogel surface, forming chemical bonds or undergoing physical adsorption, thereby altering the properties of the aerogel surface. During this process, the aerogel retains its solid state, while the modifier may gradually transform into a solid coating or attachment, or be partially absorbed by the aerogel and become part of its interior.

[0012] Preferably, an air bladder is fixedly connected to the inner wall of the guide tube near the blade, and the inner wall of the air bladder is in contact with the surface of the blade. The air bladder can reduce the wear of the blade by solid materials when the blade rotates.

[0013] Preferably, the guide tube has an outlet on its surface, which is located below the guide arc plate and communicates with the guide tube. Under the guiding action of the guide arc plate, the material is discharged through the outlet to the rotating rod.

[0014] Preferably, a toggle block is fixedly connected to the lower end of the rotating rod, and two sets of toggle plates fixedly connected to the surface of the rotating rod are provided above the toggle block.

[0015] The beneficial effects of this utility model are:

[0016] 1. The above-mentioned silica aerogel hydrophobicity improvement device can perform mixing operation on the material inside the reactor under the action of the material guiding component. The device guides the material at the bottom of the reactor to the top through the guide tube, and under the guidance of the guide arc plate, the material is discharged to the rotating rod through the outlet. This allows the material at the bottom to turn over to the top of the mixed liquid inside the reactor, which helps to improve the mixing effect, ensures the mixing effect of the modification treatment, and improves the processing efficiency of aerogel hydrophobicity modification.

[0017] 2. By setting up a material actuation component, the material inside the reactor can be mixed in a gel-plate manner under the action of the material actuation component. When the bottom block rotates, the device can actuate the material at the bottom of the reactor to assist the material guide component in mixing. When the rotating rod rotates, the two sets of actuation plates are spirally distributed on the surface of the rotating rod, and the angle between the actuation plates and the horizontal plane is acute, which can form an auxiliary guiding effect on the liquid during rotation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the hybrid mechanism structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the material moving component structure of this utility model;

[0021] Figure 4 This is a partial cross-sectional view of the material guide assembly of this utility model;

[0022] Figure 5 This is a schematic diagram showing the position of the airbag in this utility model.

[0023] In the diagram: 1. Reactor; 2. Support leg; 3. Mixing mechanism; 31. Material guide assembly; 311. Fluid guide protrusion; 312. Guide tube; 313. Guide arc plate; 314. Rotating shaft; 315. Spur gear; 316. Outlet; 317. Airbag; 318. Blade; 32. Material actuation assembly; 321. Partition plate; 322. Rotating rod; 323. Gear disk; 324. Actuation base block; 325. Actuation plate; 33. Servo motor. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In practical implementation: such as Figure 1-5 As shown, the device for improving the hydrophobicity of silica aerogel includes: a reactor 1, with multiple support legs 2 fixedly connected to the surface of the reactor 1, the multiple support legs 2 being evenly distributed in a ring along the surface of the reactor 1; a mixing mechanism 3, which is installed inside the reactor 1, with its upper end extending above the reactor 1; wherein, the mixing mechanism 3 includes a servo motor 33 installed at the upper end of the reactor 1, the output shaft of the servo motor 33 penetrating into the interior of the reactor 1 and connected to a material actuation component 32, the material actuation component 32 being installed inside the reactor 1, and multiple material guide components 31 being installed on the surface of the material actuation component 32;

[0026] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the material guiding assembly 31 includes a fluid guiding protrusion 311 fixedly connected to the inner wall of the reactor 1. A guide tube 312 is embedded in the surface of the fluid guiding protrusion 311 away from the inner wall of the reactor 1. A guide arc plate 313 is fixedly connected to the inner wall of the guide tube 312. A rotating shaft 314 is fixedly connected to the inner wall of the guide arc plate 313. A blade 318 is fixedly connected to the lower end of the rotating shaft 314. The upper end of the rotating shaft 314 extends through to the top of the guide tube 312 and is fixedly connected to a spur gear 315. The spur gear 315 meshes with the surface of the material agitation assembly 32.

[0027] An airbag 317 is fixedly connected to the inner wall of the guide tube 312 near the blade 318. The inner wall of the airbag 317 is in contact with the surface of the blade 318. An outlet 316 is provided on the surface of the guide tube 312. The outlet 316 is located below the guide arc plate 313 and is connected to the guide tube 312.

[0028] When the device is in use, the gear disk 323 rotates, driving the three spur gears 315 meshing with it to rotate synchronously. At this time, the rotating shaft 314 drives the blade 318 to rotate inside the guide tube 312. When the blade 318 rotates, it can guide the material at the bottom of the reactor 1 to the top through the guide tube 312, and under the guidance of the guide arc plate 313, the material is discharged through the outlet 316 to the rotating rod 322. This allows the material at the bottom to be turned up to the top of the mixed liquid inside the reactor 1, which helps to improve the mixing effect and improve the modification effect of the hydrophobicity of silica aerogel.

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, the material actuation assembly 32 includes a partition 321 fixedly connected to the inner wall of the reactor 1, the partition 321 fixedly connected to the upper end of the guide tube 312, a rotating rod 322 rotatably connected to the inner wall of the partition 321, a gear disk 323 fixedly connected to the surface of the rotating rod 322, the gear disk 323 being located above the partition 321, an actuation base block 324 fixedly connected to the lower end of the rotating rod 322, and two sets of actuation plates 325 fixedly connected to the surface of the rotating rod 322 above the actuation base block 324.

[0030] The servo motor 33 drives the rotating rod 322 to rotate synchronously. When the rotating rod 322 rotates, it drives the gear disk 323 and the actuating base block 324 to rotate synchronously. When the actuating base block 324 rotates, it can actuate the material auxiliary material guide component 31 at the bottom of the reactor 1 to mix. When the rotating rod 322 rotates, the two sets of actuating plates 325 are spirally distributed on the surface of the rotating rod 322, and the actuating plates 325 form an acute angle with the horizontal plane, which can form an auxiliary guiding effect on the liquid when rotating.

[0031] In use, the servo motor 33 drives the rotating rod 322 to rotate. The rotation of the rotating rod 322 drives the gear disk 323 and the actuating block 324 to rotate synchronously. When the actuating block 324 rotates, it actuates the material at the bottom of the reactor 1 to mix with the material guide assembly 31. When the rotating rod 322 rotates, the two sets of actuating plates 325 are spirally distributed on the surface of the rotating rod 322. The rotation of the gear disk 323 drives the three spur gears 315 meshing with it to rotate synchronously. The rotating shaft 314 drives the blade 318 to rotate inside the guide tube 312. When the blade 318 rotates, it guides the material at the bottom of the reactor 1 to the top through the guide tube 312. Under the guidance of the guide arc plate 313, the material is discharged through the outlet 316 to the rotating rod 322. The material at the bottom is turned over inside the reactor 1 to the top of the mixed liquid surface, which improves the modification effect of the hydrophobicity of silica aerogel.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for improving the hydrophobicity of silica aerogel, characterized in that, include: A reaction vessel (1) is provided with a plurality of support legs (2) fixedly connected to its surface. The plurality of support legs (2) are evenly distributed in a ring along the surface of the reaction vessel (1). A mixing mechanism (3) is installed inside the reactor (1), and the upper end of the mixing mechanism (3) extends above the reactor (1); The mixing mechanism (3) includes a servo motor (33) installed on the upper end of the reactor (1). The output shaft of the servo motor (33) passes through the interior of the reactor (1) and is connected to a material actuation assembly (32). The material actuation assembly (32) is installed inside the reactor (1), and multiple material guide assemblies (31) are installed on the surface of the material actuation assembly (32).

2. The device for improving the hydrophobicity of silica aerogel according to claim 1, characterized in that: The material guiding assembly (31) includes a fluid guiding protrusion (311) fixedly connected to the inner wall of the reactor (1). A guide tube (312) is embedded in the surface of the fluid guiding protrusion (311) away from the inner wall of the reactor (1). A guide arc plate (313) is fixedly connected to the inner wall of the guide arc plate (313). A rotating shaft (314) is fixedly connected to the inner wall of the guide arc plate (313). A blade (318) is fixedly connected to the lower end of the rotating shaft (314).

3. The device for improving the hydrophobicity of silica aerogel according to claim 2, characterized in that: The material actuation assembly (32) includes a partition (321) fixedly connected to the inner wall of the reactor (1). The partition (321) is fixedly connected to the upper end of the guide tube (312). A rotating rod (322) is rotatably connected to the inner wall of the partition (321). A gear disk (323) is fixedly connected to the surface of the rotating rod (322). The gear disk (323) is located above the partition (321).

4. The device for improving the hydrophobicity of silica aerogel according to claim 2, characterized in that: The upper end of the rotating shaft (314) extends through the top of the guide tube (312) and is fixedly connected to a spur gear (315), which meshes with the surface of the material actuation assembly (32).

5. The device for improving the hydrophobicity of silica aerogel according to claim 2, characterized in that: An airbag (317) is fixedly connected to the inner wall of the guide tube (312) near the blade (318), and the inner wall of the airbag (317) is in contact with the surface of the blade (318).

6. The device for improving the hydrophobicity of silica aerogel according to claim 2, characterized in that: The guide tube (312) has an outlet (316) on its surface. The outlet (316) is located below the guide arc plate (313) and is connected to the guide tube (312).

7. The device for improving the hydrophobicity of silica aerogel according to claim 3, characterized in that: The lower end of the rotating rod (322) is fixedly connected to a toggle block (324), and two sets of toggle plates (325) are fixedly connected to the surface of the rotating rod (322) above the toggle block (324).

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