A glass fiber aerogel felt based on a high-hydrophobic low-thermal-conductive medium temperature zone and a preparation method thereof

Abstract

This invention belongs to the technical field of aerogel insulation materials, specifically relating to a glass fiber aerogel felt with high hydrophobicity and low thermal conductivity in the mid-temperature range and its preparation method. The invention involves first hydrolyzing a silicon source, then adding an organic phase and alkali solution to the hydrolysate to polymerize and obtain a sol. Finally, the glass fiber felt is impregnated with the sol, cured, aged, and dried under a gradient at atmospheric pressure to obtain the glass fiber aerogel felt with high hydrophobicity and low thermal conductivity in the mid-temperature range. This method uses readily available and simple raw materials, employs atmospheric pressure drying for post-processing, eliminates the need for post-modification processes, has a short process cycle, and high production efficiency, facilitating large-scale industrialization. The prepared glass fiber aerogel felt exhibits an average thermal conductivity ≤0.018 W / (m•K) at 25℃, ≤0.035 W / (m•K) at 300℃, and ≤0.08 W / (m•K) at 600℃; its hydrophobicity is ≥98%. The low thermal conductivity and high hydrophobicity broaden its applications in the mid-temperature range.

Description

Technical Field

[0001] This invention belongs to the technical field of aerogel thermal insulation materials, specifically relating to a glass fiber aerogel felt based on high hydrophobicity and low thermal conductivity in the mid-temperature range and its preparation method. Background Technology

[0002] Glass fiber is a high-performance inorganic non-metallic material with many varieties. Its advantages include good insulation, strong heat resistance, good corrosion resistance, and high mechanical strength, but its disadvantages include brittleness and poor wear resistance. Silica aerogel is a lightweight material with a three-dimensional network structure and a nanoporous structure, exhibiting extremely low solid-state and gaseous thermal conductivity. Low thermal conductivity glass fiber aerogel felt is a high-performance thermal insulation material that combines the nanoporous structure of aerogel with glass fiber reinforcement. The core principle is to retain the ultra-low thermal conductivity of aerogel while using glass fiber to address the shortcomings of pure aerogel, such as high brittleness, low strength, and easy powder shedding, making it suitable for the high-efficiency energy-saving needs of industrial pipelines, buildings, LNG, and new energy applications. Currently, much research focuses on the preparation of composite thermal insulation felt using glass fiber and silica aerogel.

[0003] Patent document CN108215372A discloses a method for preparing a nano-silica aerogel glass fiber composite felt. The method involves first preparing a slurry from 15-30 parts silica aerogel particles, 1-3 parts silane coupling agent, 3-6 parts sodium silicate, and 20-30 parts solvent, then laying this slurry onto a felt board. Next, glass fibers are laid on the surface of the silica aerogel slurry. This process is repeated, with the silica aerogel slurry then laid on the glass fiber surface. After the slurry is completed, it is extruded and dried to obtain the silica aerogel glass fiber composite felt. This composite felt comprises alternating layers of silica aerogel and glass fiber. The alternating arrangement of these layers structurally separates the silica aerogel and glass fiber, creating a continuous silica aerogel structure. This reduces the gaps between the silica aerogel particles, thereby lowering the thermal conductivity of the composite felt. Furthermore, the silica aerogel and glass fiber are separated, which avoids a large amount of glass fiber being interspersed within the silica aerogel, thus reducing the thermal conductivity of the composite felt. In addition, the layered structure allows the binder to exist only in the silica aerogel layer or only in the glass fiber layer, thereby avoiding continuous thermal conduction by the binder and reducing the thermal conductivity of the composite felt to between 0.007 and 0.010 W / (m•K).

[0004] Patent document CN109626955A discloses a method for preparing a high-temperature resistant glass fiber composite silica aerogel insulation felt. The method includes the following steps: 1) preparation of silica liquid, the raw materials of which include a silicon source precursor, solvent, hydrolysis catalyst, and additives; 2) molding of glass fiber felt alcohol gel; 3) aging and surface modification of the molded glass fiber felt alcohol gel; 4) drying of the aged and surface-modified glass fiber felt alcohol gel to obtain the high-temperature resistant glass fiber composite silica aerogel insulation felt; 5) performance testing of the high-temperature resistant glass fiber composite silica aerogel insulation felt. The high-temperature resistant glass fiber composite aerogel insulation felt produced by this method has a thermal conductivity of 0.016~0.022 W / (m•K) at room temperature and a hydrophobic failure temperature above 450℃, effectively improving the high-temperature performance of SiO2 aerogel composite materials.

[0005] The aforementioned existing patent documents indicate that the thermal conductivity of fiberglass aerogel felt at room temperature is approximately 0.015~0.021 W / (m•K), but its high-temperature stability in the medium temperature range (300℃~600℃) is poor, and the high thermal conductivity limits its practical application scenarios.

[0006] Patent document CN102964088A discloses an ultra-low thermal conductivity nano-aerogel insulation material, which is made from the following raw materials by weight percentage: nano-sized SiO2 powder 60~100%; infrared shading agent 0~30%; reinforcing fiber 0~10%; binder 0~5%. The ultra-low thermal conductivity nanoporous insulation material prepared in this technical solution has a thermal conductivity (hot surface 800℃) ≤0.040 W / (m•K), compressive strength ≥0.7MPa, and bulk density of 250~400 kg / m³. 3 .

[0007] Patent document CN115583829B discloses a low thermal conductivity fiber composite aerogel wet-laid felt and its preparation method. By weight percentage, it comprises 50%–80% fiber and 20%–50% aerogel. This aerogel wet-laid felt has a thermal conductivity ≤0.016 W / (m•K) at 25℃, ≤0.032 W / (m•K) at 300℃, and ≤0.064 W / (m•K) at 500℃. The preparation method involves first dispersing the fibers to form a fiber suspension; then conveying it to a nonwoven forming equipment screen, where it undergoes deposition and vacuum filtration treatment; next, a sol-gel solution is sprayed onto the suspension, and gelation occurs in a heated tunnel. After rolling, the suspension is placed in an aging tank; finally, supercritical drying is performed to obtain the finished fiber composite aerogel wet-laid felt.

[0008] The aforementioned existing patent documents indicate that current methods mainly involve adding light-blocking agents to the raw materials or improving the fiber felting and aerogel composite process to reduce the thermal conductivity at medium and high temperatures. However, there are technical challenges in achieving large-scale industrial production, including the difficulty in obtaining light-blocking raw materials and the high complexity and cost of the process.

[0009] Therefore, it is particularly important to develop a method for preparing low thermal conductivity glass fiber aerogel mat based on the mid-temperature range that uses readily available raw materials and has a simple process, so as to further reduce the high-temperature thermal conductivity of glass fiber aerogel mat and broaden its application fields. Summary of the Invention

[0010] Therefore, the purpose of this invention is to provide a glass fiber aerogel mat with high hydrophobicity and low thermal conductivity in the mid-temperature range and its preparation method. This method, through optimization of the aerogel mat process, can reduce the thermal conductivity of the aerogel mat product in the mid-temperature range, thereby broadening its application areas. This invention also provides a glass fiber aerogel mat with high hydrophobicity and low thermal conductivity in the mid-temperature range prepared by the above method.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a method for preparing a glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range, comprising the following steps: S1, mix silicon source, ethanol, water and acid in a certain proportion, and hydrolyze to obtain solution A; S2, add the organic phase to solution A in S1 according to the proportion and mix to obtain solution B; S3, add the alkaline solution to solution B described in S2 in a certain proportion, and the polymerization reaction yields a sol; S4. After immersing the fiberglass felt in the sol described in S3 for a period of time, remove it and heat it to solidify, thus obtaining a fiberglass aerogel felt composite. After aging and drying, the glass fiber aerogel felt composite described in S5 and S4 is obtained as a glass fiber aerogel felt with high hydrophobicity and low thermal conductivity in the mid-temperature range.

[0012] Further, the molar ratio of the silicon source, ethanol, water and acid in S1 is 5~15:10~25:1~5:0~2, the silicon source includes any one or more of tetraethoxysilane (Si-28), hexadecyltriethoxysilane, methyltriethoxysilane and dimethyldiethoxysilane; the acid includes hydrochloric acid, acetic acid, oxalic acid or sulfuric acid, and the mass solubility of the acid is 35~38%.

[0013] Furthermore, the hydrolysis described in S1 is carried out at a temperature of 75~85℃ for 5~7 hours.

[0014] Further, the volume ratio of the organic phase in S2 to the solution A is 1~5:10; the organic phase includes any one or more of n-hexane, isooctane, cyclohexane and n-heptane.

[0015] This invention introduces an organic phase (third phase), which acts as a reaction bridge between aerogel particles, facilitating the formation of a continuous and complete three-dimensional network structure and maintaining its porous structure. This significantly reduces its thermal conductivity. Simultaneously, it displaces water from the pores of the aerogel felt, enhancing the skeleton's strength and allowing for direct atmospheric pressure drying of the aerogel felt, thus reducing costs and increasing efficiency.

[0016] Furthermore, in S2, the mixing temperature of the organic phase and the solution A is 40~60℃, and the mixing time is 1~2 hours.

[0017] Furthermore, in S3, the volume ratio of the alkaline solution to the solution B is 1:30~40, and the alkaline solution includes a sodium hydroxide solution with a mass concentration of 5~7%; the polymerization reaction temperature is 20~35℃, and the time is 1~2 minutes.

[0018] Further, the fiberglass mat in S4 comprises glass fiber or aluminosilicate fiber; the fiber length of the fiberglass mat is 3-5 mm, the fiber diameter is 9-11 μm, the thickness of the fiberglass mat is 1-5 mm, and the basis weight is 80-150 kg / m³. 3 The weight gain of the fiberglass mat after immersion in the sol in S3 is 30~60 kg / m. 3 The heating and curing temperature is 75~85℃, and the time is 10~30 minutes.

[0019] Furthermore, the glass fiber aerogel felt composite described in S5 is aged in an organic solvent for 22-26 hours, and the organic solvent includes anhydrous ethanol.

[0020] Furthermore, the drying process employs atmospheric pressure gradient drying, with the following temperature gradients: 60±1℃ for 2 hours, 80±1℃ for 2 hours, and 120±1℃ for 4 hours. Atmospheric pressure drying results in a short process cycle and high efficiency.

[0021] The present invention further provides a glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range, which is prepared by the above-mentioned preparation method of glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range.

[0022] Furthermore, the glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range possesses low thermal conductivity and high hydrophobicity, with an average thermal conductivity of ≤0.018 W / (m•K) at 25℃, ≤0.035 W / (m•K) at 300℃, and ≤0.08 W / (m•K) at 600℃; and a hydrophobicity ≥98%.

[0023] Furthermore, the glass fiber aerogel felt based on high hydrophobicity and low thermal conductivity in the mid-temperature range can be widely used in petrochemical, new energy, and transportation fields.

[0024] The beneficial effects of this invention are: 1. The method for preparing glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range provided by the present invention does not use auxiliary components such as light-blocking agents in the raw materials, and the raw materials are simple and readily available; the glass fiber mat is impregnated in the process and dried at normal pressure in the post-treatment, without the need for post-modification process, the process cycle is short and the production efficiency is high, which is conducive to large-scale industrialization.

[0025] 2. The method for preparing glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range provided by this invention introduces a third phase into the silicon source hydrolysate before sol preparation. The introduction of the third phase serves two purposes: first, it acts as a reaction bridge between aerogel particles, facilitating the formation of a continuous and complete three-dimensional network structure and maintaining its porous structure, which significantly reduces its thermal conductivity; second, it replaces water in the pores of the aerogel mat, enhancing the skeleton strength and allowing the aerogel mat to be dried directly under normal pressure, thus reducing costs and increasing efficiency.

[0026] 3. The glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range provided by this invention has an average thermal conductivity of ≤0.018 W / (m•K) at 25℃, ≤0.035 W / (m•K) at 300℃, and ≤0.08 W / (m•K) at 600℃; and a hydrophobicity ≥98%. Its low thermal conductivity and high hydrophobicity broaden the application of aerogel mats in the mid-temperature range, making it widely applicable in fields such as petrochemicals, new energy, and transportation. Attached Figure Description

[0027] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a picture of the glass fiber aerogel mat product with high hydrophobicity and low thermal conductivity in the mid-temperature range prepared in Example 1 of the present invention. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. All mentioned embodiments are implemented based on the technical solutions of the present invention, and detailed implementation processes are given. However, it should be stated that the scope of protection of the present invention is not limited to the following embodiments.

[0030] The following embodiments provide detailed implementation procedures for the technical solutions of the present invention. Unless otherwise specified, the experimental methods used in the following experimental examples are conventional methods; unless otherwise specified, the materials and reagents used are commercially available.

[0031] Example 1

[0032] The following steps were taken to prepare a glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range: S1: Tetraethoxysilane, hexadecyltriethoxysilane, ethanol, water, and hydrochloric acid (mass concentration 38%) are mixed in a molar ratio of 10:1:20:2:0.1 and hydrolyzed at 80°C for 6 hours to obtain the hydrolysate for later use.

[0033] S2: At 45℃, isooctane (organic phase) is added dropwise to the hydrolysate and the mixture is stirred for 1 hour. The ratio of isooctane to hydrolysate is 1:10 (volume ratio).

[0034] S3: At 30°C, add a 6% sodium hydroxide aqueous solution to the solution in step S2 and carry out a rapid stirring reaction for 1 minute to obtain a mixed sol.

[0035] S4: Immerse the fiberglass mat in the mixed sol and cure it in an 80℃ oven for 10-30 minutes until the surface gel is complete; the fiberglass mat is made of wet-laid glass fiber with a fiber length of 4mm, a diameter of 10μm, a thickness of 2mm, and a basis weight of 100 kg / m². 3 The weight gain of the fiberglass mat after immersion in the mixed sol was 60 kg / m. 3 That is, the basis weight of the fiberglass mat after soaking is 160 kg / m. 3 .

[0036] S5: The cured fiberglass mat is placed in anhydrous ethanol and aged at 70℃ for 24 hours. After aging, it is removed and dried using a gradient drying method under normal pressure (60℃ / 2h~80℃ / 2h~120℃ / 4h) to finally obtain the aerogel composite mat product. Figure 1 ).

[0037] Example 2

[0038] The following steps were taken to prepare a glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range: S1: Tetraethoxysilane, methyltriethoxysilane, ethanol, water, and hydrochloric acid (mass concentration 38%) are mixed in a molar ratio of 4:2:20:3:0.05 and hydrolyzed at 80°C for 6 hours to obtain the hydrolysate for later use.

[0039] S2: At 45℃, isooctane (organic phase) is added dropwise to the hydrolysate and the mixture is stirred for 1 hour. The ratio of isooctane to hydrolysate is 1:10 (volume ratio).

[0040] S3: At 30°C, add a 6% sodium hydroxide aqueous solution to the solution in step S2 and carry out a rapid stirring reaction for 1 minute to obtain a mixed sol.

[0041] S4: Immerse the glass fiber mat in the mixed sol and cure it in an 80℃ oven for 10-30 minutes until the surface gel is complete; the glass fiber mat is a wet-laid glass fiber mat with a fiber length of 4mm, a diameter of 10μm, a thickness of 2mm, and a basis weight of 100kg / m². 3 The weight gain of the fiberglass mat after immersion in the mixed sol was 55 kg / m. 3 That is, the basis weight of the fiberglass mat after soaking is 155 kg / m. 3 .

[0042] S5: Place the cured fiberglass felt in anhydrous ethanol at 70℃ for 24 hours, remove it, and use atmospheric pressure gradient drying (60℃ / 2h~80℃ / 2h~120℃ / 4h) to finally obtain the aerogel composite felt product.

[0043] Example 3

[0044] A glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range was prepared. The difference between this embodiment and Example 1 is that cyclohexane was selected as the organic phase in step S2, and the ratio of organic phase to hydrolysate was 3:10 (volume ratio).

[0045] Example 4

[0046] A glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range was prepared. The difference between this embodiment and Example 1 is that the alkaline solution in step S3 is 5% sodium hydroxide. In this embodiment, the weight gain of the glass fiber mat after immersion in the mixed sol is 50 kg / m². 3 That is, the basis weight of the fiberglass mat after soaking is 150 kg / m. 3 .

[0047] Example 5

[0048] A glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range was prepared. The difference between this embodiment and Example 1 is that in step S4, the glass fiber mat is an aluminosilicate fiber mat, with a fiber length of 150 mm, a diameter of 3 μm, a thickness of 1 mm, and a basis weight of 110 kg / m³. 3 The weight gain of the fiberglass mat after immersion in the mixed sol was 30 kg / m. 3 That is, the basis weight of the fiberglass mat after soaking is 140 kg / m. 3 .

[0049] Comparative Example 1 A glass fiber aerogel mat was prepared. The difference between this comparative example and Example 1 is that step S2 was not used, that is, a third phase was not introduced into the silicon source hydrolysate before the sol preparation.

[0050] Comparative Example 2 A glass fiber aerogel mat was prepared. The difference between this comparative example and Example 1 is that atmospheric pressure gradient drying was not used in step S5. The drying process used in this comparative example was freeze-drying.

[0051] Comparative Example 3 A glass fiber aerogel mat was prepared. The difference between this comparative example and Example 1 is that step S2 was not used, i.e., a third phase was not introduced into the silicon source hydrolysate before sol preparation. Atmospheric pressure gradient drying was not used in step S5. The drying process used in this comparative example was freeze-drying.

[0052] Implementation effect analysis

[0053] The thermal conductivity and hydrophobicity of the glass fiber aerogel mats prepared in Examples 1-5 and Comparative Examples 1-3 were tested at different temperatures, and the test results are shown in Table 1 below.

[0054] Table 1. Summary of the properties of the glass fiber aerogel mats prepared in Examples 1-5 and Comparative Examples 1-3

[0055] The data in Table 1 show that the fiberglass aerogel felt products prepared in the embodiments of this invention possess both high hydrophobicity and excellent thermal insulation properties, and exhibit outstanding high-temperature thermal stability. In terms of average performance, the average thermal conductivity at room temperature for Examples 1-5 is 0.0178 W / (m•K), which is basically equivalent to the average thermal conductivity at room temperature of 0.0180 W / (m•K) for Comparative Examples 1-3, ensuring excellent basic thermal insulation performance at room temperature. At a medium temperature of 300℃, the average thermal conductivity of the examples is only 0.0336 W / (m•K), far lower than the 0.0390 W / (m•K) of the comparative examples, indicating a significant improvement in medium-temperature thermal insulation performance. At a high temperature of 600℃, the average thermal conductivity of the examples is 0.0780 W / (m•K), significantly better than the average level of 0.1073 W / (m•K) of the comparative examples, demonstrating even more pronounced high-temperature thermal insulation advantages. Meanwhile, the thermal conductivity of the embodiments increased much less with increasing temperature than that of the comparative examples. From room temperature to 600°C, the average increase in thermal conductivity of the embodiments was approximately 338%, while the average increase in the comparative examples was as high as 496%, fully demonstrating the superior high-temperature thermal insulation stability of the embodiments. Regarding hydrophobic properties, the embodiments achieved an average hydrophobicity of 98.56%, with a maximum of 99.9%, a significant improvement compared to the comparative examples' average hydrophobicity of 95.93%, indicating a substantial enhancement in hydrophobic effect. Furthermore, the performance of products dried at atmospheric pressure was superior to that of freeze-dried products.

[0056] In summary, the method for preparing glass fiber aerogel mat based on mid-temperature high hydrophobicity and low thermal conductivity provided by this invention does not use auxiliary components such as light-blocking agents in the raw materials, which are simple and readily available. A third phase is introduced into the silicon source hydrolysate before sol preparation. The introduction of the third phase serves two purposes: first, it acts as a reaction bridge between aerogel particles, facilitating the formation of a continuous and complete three-dimensional network structure and maintaining its porous structure, which significantly reduces its thermal conductivity; second, it replaces water in the pores of the aerogel mat, enhancing the skeleton strength and allowing the aerogel mat to be directly dried at atmospheric pressure, reducing costs and increasing efficiency. The process involves impregnation of the glass fiber mat, followed by atmospheric pressure drying, eliminating the need for post-modification processes. This results in a short process cycle, high production efficiency, and is conducive to large-scale industrialization. The glass fiber aerogel mat prepared in this invention, based on high hydrophobicity and low thermal conductivity in the mid-temperature range, has an average thermal conductivity of ≤0.018 W / (m•K) at 25℃, ≤0.035 W / (m•K) at 300℃, and ≤0.08 W / (m•K) at 600℃; its hydrophobicity is ≥98%. These characteristics of low thermal conductivity and high hydrophobicity broaden the application of aerogel mats in the mid-temperature range, making them widely applicable in fields such as petrochemicals, new energy, and transportation.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range, characterized in that, Includes the following steps: S1, mix silicon source, ethanol, water and acid in a certain proportion, and hydrolyze to obtain solution A; S2, add the organic phase to solution A in S1 according to the proportion and mix to obtain solution B; S3, add the alkaline solution to solution B described in S2 in a certain proportion, and the polymerization reaction yields a sol; S4. After immersing the fiberglass felt in the sol described in S3 for a period of time, remove it and heat it to solidify, thus obtaining a fiberglass aerogel felt composite. After aging and drying, the glass fiber aerogel felt composite described in S5 and S4 is obtained as a glass fiber aerogel felt with high hydrophobicity and low thermal conductivity in the mid-temperature range.

2. The method for preparing a glass fiber aerogel mat based on a mid-temperature range high hydrophobicity and low thermal conductivity according to claim 1, characterized in that, The molar ratio of silicon source, ethanol, water and acid in S1 is 5~15:10~25:1~5:0~2. The silicon source includes any one or more of tetraethoxysilane, hexadecyltriethoxysilane, methyltriethoxysilane and dimethyldiethoxysilane. The acid includes hydrochloric acid, acetic acid, oxalic acid or sulfuric acid, and the mass solubility of the acid is 35~38%.

3. The method for preparing a glass fiber aerogel mat based on a mid-temperature range high hydrophobicity and low thermal conductivity according to claim 1, characterized in that, The hydrolysis temperature described in S1 is 75~85℃, and the time is 5~7 hours.

4. The method for preparing a glass fiber aerogel mat based on a mid-temperature range high hydrophobicity and low thermal conductivity according to claim 1, characterized in that, The volume ratio of the organic phase in S2 to the solution A is 1~5:10; the organic phase includes any one or more of n-hexane, isooctane, cyclohexane and n-heptane.

5. The method for preparing a glass fiber aerogel mat based on a mid-temperature range high hydrophobicity and low thermal conductivity according to claim 1, characterized in that, The mixing temperature of the organic phase and the solution A in S2 is 40~60℃, and the mixing time is 1~2 hours.

6. The method for preparing a glass fiber aerogel mat based on a mid-temperature-range high hydrophobicity and low thermal conductivity material according to claim 1, characterized in that, The volume ratio of the alkaline solution to solution B in S3 is 1:30~40, and the alkaline solution includes a sodium hydroxide solution with a mass concentration of 5~7%; the polymerization reaction temperature is 20~35℃, and the time is 1~2 minutes.

7. The method for preparing a glass fiber aerogel mat based on a mid-temperature-range high hydrophobicity and low thermal conductivity material according to claim 1, characterized in that, The fiberglass mat described in S4 comprises glass fiber or aluminum silicate fiber; the fiber length of the fiberglass mat is 3-5 mm, the fiber diameter is 9-11 μm, the thickness of the fiberglass mat is 1-5 mm, and the basis weight is 80-150 kg / m². 3 The weight gain of the fiberglass mat after immersion in the sol in S3 is 30~60 kg / m. 3 The heating and curing temperature is 75~85℃, and the time is 10~30 minutes.

8. The method for preparing a glass fiber aerogel mat based on a mid-temperature-range high hydrophobicity and low thermal conductivity material according to claim 1, characterized in that, The glass fiber aerogel felt composite described in S5 is aged in an organic solvent for 22-26 hours, and the organic solvent includes anhydrous ethanol.

9. The method for preparing a glass fiber aerogel mat based on a mid-temperature range high hydrophobicity and low thermal conductivity according to claim 1, characterized in that, The drying process employs atmospheric pressure gradient drying, with the following temperature gradients: 60±1℃ for 2 hours, 80±1℃ for 2 hours, and 120±1℃ for 4 hours.

10. A glass fiber aerogel mat based on high hydrophobicity and low thermal conductivity in the mid-temperature range, characterized in that, It was prepared using the glass fiber aerogel mat preparation method based on high hydrophobicity and low thermal conductivity in the mid-temperature range as described in any one of claims 1 to 9.

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