Production method of glass fiber aerogel tube

Abstract

The invention discloses a production method of a glass fiber aerogel tube. The production method comprises the following steps: pretreating raw materials, preparing molten glass liquid, preparing glass fibers, cooling and cutting, preparing silicon dioxide liquid, preparing aerogel felt, cutting, rolling a tube and drying and forming. The method is simple in process, simple and convenient to operate and short in preparation period, meanwhile, raw materials in the preparation process of the glass fiber aerogel tube are low in cost, green and safe, and the internal structure is uniform and stable. According to the preparation method, a pipe orifice zero heat loss process is used for treatment, so that the energy-saving effect of the product is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation, cold insulation, energy saving and carbon reduction materials, specifically to a method for producing glass fiber aerogel tubes. Background Technology

[0002] Aerogel is a solid material with a nanoporous network structure. Due to its extremely low density, it is known as the lightest solid material in the world and is also called "frozen smoke," "a magical material that changes the world," and "the ultimate thermal insulation material." Because of its fine nanoporous structure and high surface area, aerogel exhibits outstanding properties in thermal insulation, fire resistance, sound insulation, optics, and mechanics. The production process of aerogel materials is safe, environmentally friendly, and non-toxic.

[0003] Aerogel materials began industrial production in the United States in 2002, mainly for use in the aerospace field; they were introduced to China in 2004, and research and development of aerogel products began in China in 2006, with industrial production and application starting in 2009.

[0004] Existing technologies for preparing aerogel materials mostly employ the following steps: raw material dispersion, synthesis and stirring, drying, cutting, and packaging. These methods suffer from the following technical problems: 1. Inadequate thermal conductivity, poor bonding strength, and poor water resistance; 2. Cumbersome construction and poor adhesion, unable to adhere tightly to pipes, resulting in poor safety; 3. The product itself has seams, and the fit between products also has seams, leading to significant heat loss; 4. Key performance indicators fail to meet standards. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a method for producing glass fiber aerogel tubes.

[0006] To solve the above-mentioned technical problems, the present invention provides a method for producing glass fiber aerogel tubes, comprising the following steps:

[0007] A method for producing glass fiber aerogel tubes includes the following steps:

[0008] S1. Raw material pretreatment

[0009] The glass raw materials are pretreated by screening, grinding, washing and drying to remove impurities and surface contaminants.

[0010] S2. Preparation of molten glass

[0011] The pretreated glass raw material is heated to 1100-1300℃ to form molten glass.

[0012] S3. Preparation of glass fibers

[0013] Molten glass is injected into a high-speed rotating centrifuge, and centrifugal force is used to form glass fibers from the molten glass.

[0014] S4. Cool and cut

[0015] The glass fiber is cooled to harden it; then the cooled glass fiber is cut into specified lengths for later use.

[0016] S5. Preparation of liquid silica

[0017] Silicon source, water, alcohol solvent, dispersant, thickener and stabilizer are mixed and stirred by a disperser to allow the solution to undergo a full polymerization reaction, thus preparing silica liquid;

[0018] S6. Preparation of aerogel felt

[0019] The glass fiber obtained from S4 is added to the silica liquid obtained from S5. After the two materials are thoroughly mixed, they are poured into a molding mold and the ambient temperature and pressure are raised to a supercritical state for drying, so that the solvent in the silica liquid evaporates. The temperature of the system and the molding time are controlled during the reaction to obtain a uniform and dense aerogel felt.

[0020] S7. Cutting

[0021] Remove the aerogel felt from the mold, perform preliminary cutting of the aerogel felt, and perform zero heat loss process treatment on the joints;

[0022] S8. Tube

[0023] Place the cut aerogel felt into a tube rolling machine and roll the aerogel felt into a tube for later use.

[0024] S9. Dry and shape

[0025] The aerogel tubes undergo a drying process, during which residual solvents and moisture are evaporated in a kiln. The dried aerogel tubes are then placed in a cutting machine for cutting, forming the final finished glass fiber aerogel tube.

[0026] As an improvement, the glass raw materials include: quartz sand, alumina, calcium oxide, magnesium carbonate, potassium hydrogen silicate, and sodium silicate.

[0027] As an improvement, the stirring in step S5 is carried out by mechanical stirring or peristaltic stirring, with a stirring speed of 3000-5000 r / min and a stirring time of 15-30 min.

[0028] As an improvement, the feeding ratio of glass fiber to silica liquid in step S6 is 1:1-20.

[0029] As an improvement, the cutting method in step S7 is to cut the aerogel felt into a rectangle and cut off a strip of aerogel at the diagonal position, which is half the length of the aerogel felt.

[0030] As an improvement, the width of the two aerogel strips cut in step S7 is 0.5mm-2mm, and the length is half the length of the aerogel felt.

[0031] As an improvement, the kiln journey in step S9 is 30-120 minutes and the temperature is 120±5℃.

[0032] The advantages of this invention are:

[0033] This invention discloses a method for preparing glass fiber aerogel tubes. This method is simple, easy to operate, and has a short preparation cycle. Furthermore, the raw materials used in the preparation of glass fiber aerogel tubes are low-cost, environmentally friendly, and safe, and the internal structure is uniform and stable. This invention employs a zero-heat-loss process at the tube opening in the preparation method, significantly improving the energy-saving effect of the product. It also addresses the pain points of existing technologies.

[0034] 1) Solves the safety hazards caused by the corrosion and damage of pipes due to the water resistance of traditional pipe insulation materials;

[0035] 2) It solves the problem of poor insulation performance of traditional pipe insulation materials, which leads to huge energy waste;

[0036] 3) Solves the problems of cumbersome construction, high labor costs and long construction period of traditional pipe insulation materials;

[0037] 4) It solves the problem of numerous joints between traditional pipe insulation materials, which leads to significant heat loss and waste;

[0038] 5) Fiberglass aerogel tubes offer a thin and lightweight insulation solution, reducing space waste and enhancing safety. Attached Figure Description

[0039] Figure 1 This is a diagram illustrating the cutting method in the cutting step of a glass fiber aerogel tube production method, as shown in the embodiment.

[0040] The image shows:

[0041] 1-Aerogel felt, 2-Aerogel strip. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Example 1

[0044] This embodiment discloses a method for producing glass fiber aerogel tubes, including the following steps:

[0045] S1. Raw material pretreatment

[0046] The glass raw materials are pretreated by screening, grinding, washing and drying to remove impurities and surface contaminants. The glass raw materials include: quartz sand, alumina, calcium oxide, magnesium carbonate, potassium hydrogen silicate and sodium silicate.

[0047] S2. Preparation of molten glass

[0048] The pretreated glass raw material is heated to 1100-1300℃ to form molten glass.

[0049] S3. Preparation of glass fibers

[0050] Molten glass is injected into a high-speed rotating centrifuge, and centrifugal force is used to form glass fibers from the molten glass.

[0051] S4. Cool and cut

[0052] The glass fiber is cooled to harden it; then the cooled glass fiber is cut into specified lengths for later use.

[0053] S5. Preparation of liquid silica

[0054] Silicon source, water, alcohol solvent, dispersant, thickener and stabilizer are mixed and stirred by a disperser to allow the solution to undergo a full polymerization reaction to prepare silica liquid. Stirring is carried out by mechanical stirring or peristaltic stirring at a speed of 3000-5000 r / min for 15-30 min.

[0055] S6. Preparation of aerogel felt

[0056] The glass fiber obtained in S4 was added to the silica liquid obtained in S5, with a glass fiber to silica liquid ratio of 1:4. After the two materials were thoroughly mixed, they were poured into a molding mold, and the ambient temperature and pressure were raised to a supercritical state for drying to evaporate the solvent in the silica liquid. The temperature of the system and the molding time were controlled during the reaction to obtain a uniform and dense aerogel felt.

[0057] S7. Cutting

[0058] Remove the aerogel felt from the mold, perform preliminary cutting of the aerogel felt, and perform zero heat loss process treatment on the joints;

[0059] Specific cutting methods are as follows: Figure 1 As shown: Cut the aerogel mat 1 into a rectangle, and cut two aerogel strips 2 at opposite corners of the aerogel mat 1. The width of the two cut aerogel strips 2 is 0.5mm-2mm, and the length is half the length of the aerogel mat 1.

[0060] S8. Tube

[0061] The cut aerogel felt is placed into a tube rolling machine and rolled into a tube for later use.

[0062] S9. Dry and shape

[0063] The aerogel tubes undergo a drying process, in which residual solvents and moisture are evaporated in a kiln for 30-120 minutes at a temperature of 120±5℃. The dried aerogel tubes are then placed in a cutting machine for cutting, forming the final finished glass fiber aerogel tube.

[0064] Commercially available glass fiber aerogel tubes were taken and compared with the indicators in Example 1. The test results are as follows:

[0065] Table 1. Physicochemical properties of commercially available glass fiber aerogel tubes

[0066] Serial Number Testing items Testing basis Indicator Requirements Test results One-way decision 1 Thermal conductivity / [W / (mK)] GB / T 25261-2018 ≤0.030 0.040 Unqualified 2 VOC content (g / L) GB / T 23986-2009 ≤100 88 qualified 3 Bond strength HG / T 4567-2013 ≥0.4 0.20 Unqualified 4 Alkali resistance (48h) GB / T 9265-2009 No abnormalities No abnormalities qualified 5 Water resistance (96h) GB / T 1733-1993 No abnormalities abnormal Unqualified

[0067] Table 2. Physicochemical properties of the glass fiber aerogel tubes prepared in Example 1

[0068] Serial Number Testing items Testing basis Indicator Requirements Test results One-way decision 1 Thermal conductivity - average temperature 0℃ GB / T 25261-2018 ≤0.03 0.025 qualified 2 VOC content (g / L) GB / T 23986-2009 ≤100 11 qualified 3 Bond strength HG / T 4567-2013 ≥0.4 1.0 qualified 4 Alkali resistance (48h) GB / T 9265-2009 No abnormalities No abnormalities qualified 5 Water resistance (96h) GB / T 1733-1993 No abnormalities No abnormalities qualified

[0069] Comparing Tables 1 and 2, it can be seen that the glass fiber aerogel tube prepared by this method has significantly improved thermal conductivity and bonding strength, and its internal VOC content is significantly reduced, exhibiting green and environmentally friendly characteristics. Furthermore, its water resistance and alkali resistance are also significantly improved compared to existing glass fiber aerogel tubes.

[0070] The specific embodiments of the present invention have been described in detail above, but they are merely examples, and the present invention is not equivalent to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A method for producing glass fiber aerogel tubes, characterized in that, Includes the following steps: S1. Raw material pretreatment The glass raw materials are pretreated by screening, grinding, washing and drying to remove impurities and surface contaminants. S2. Preparation of molten glass The pretreated glass raw material is heated to 1100-1300℃ to form molten glass. S3. Preparation of glass fibers Molten glass is injected into a high-speed rotating centrifuge, and centrifugal force is used to form glass fibers from the molten glass. S4. Cool and cut The glass fiber is cooled to harden it; then the cooled glass fiber is cut into specified lengths for later use. S5. Preparation of liquid silica Silicon source, water, alcohol solvent, dispersant, thickener and stabilizer are mixed and stirred by a disperser to allow the solution to undergo a full polymerization reaction, thus preparing silica liquid; S6. Preparation of aerogel felt The glass fiber obtained from S4 is added to the silica liquid obtained from S5. After the two materials are thoroughly mixed, they are poured into a molding mold and the ambient temperature and pressure are raised to a supercritical state for drying, so that the solvent in the silica liquid evaporates. The temperature of the system and the molding time are controlled during the reaction to obtain a uniform and dense aerogel felt. S7. Cutting Remove the aerogel felt from the mold, perform preliminary cutting of the aerogel felt, and perform zero heat loss process treatment on the joints; S8. Tube Place the cut aerogel felt into a tube rolling machine and roll the aerogel felt into a tube for later use. S9. Dry and shape The aerogel tubes undergo a drying process, during which residual solvents and moisture are evaporated in a kiln. The dried aerogel tubes are then placed in a cutting machine for cutting, forming the final finished glass fiber aerogel tube.

2. The method for producing glass fiber aerogel tubes according to claim 1, characterized in that, The glass raw materials include: quartz sand, alumina, calcium oxide, magnesium carbonate, potassium hydrogen silicate, and sodium silicate.

3. The method for producing glass fiber aerogel tubes according to claim 1, characterized in that, The stirring in step S5 is carried out by mechanical stirring or peristaltic stirring, with a stirring speed of 3000-5000 r / min and a stirring time of 15-30 min.

4. The method for producing glass fiber aerogel tubes according to claim 1, characterized in that, The feeding ratio of glass fiber to silica liquid in step S6 is 1:1-20.

5. The method for producing glass fiber aerogel tubes according to claim 1, characterized in that, The cutting method described in step S7 is to cut the aerogel felt into a rectangle and cut off a strip of aerogel at the diagonal position, which is half the length of the aerogel felt.

6. The method for producing glass fiber aerogel tubes according to claim 5, characterized in that, The width of the two aerogel strips cut in step S7 is 0.5mm-2mm, and the length is half the length of the aerogel felt.

7. The method for producing glass fiber aerogel tubes according to claim 1, characterized in that, The kiln journey in step S9 is 30-120 minutes, and the temperature is 120±5℃.

8. A glass fiber aerogel tube, characterized in that, The glass fiber aerogel tube is prepared by the method described in claims 1-7.

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