TW202221193A - Manufacturing method of aerogel felt - Google Patents

Manufacturing method of aerogel felt Download PDF

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TW202221193A
TW202221193A TW110109854A TW110109854A TW202221193A TW 202221193 A TW202221193 A TW 202221193A TW 110109854 A TW110109854 A TW 110109854A TW 110109854 A TW110109854 A TW 110109854A TW 202221193 A TW202221193 A TW 202221193A
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aerogel
parts
glass fiber
fiber mat
manufacturing
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TWI765609B (en
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王澤金
王翩
徐小明
王作勤
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大陸商國佳新材湖北環保凝膠產業園有限公司
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
    • D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/227—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated
    • D06M15/233—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated aromatic, e.g. styrene
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/327—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated alcohols or esters thereof
    • D06M15/333—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated alcohols or esters thereof of vinyl acetate; Polyvinylalcohol
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/356—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of other unsaturated compounds containing nitrogen, sulfur, silicon or phosphorus atoms
    • D06M15/3568—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of other unsaturated compounds containing nitrogen, sulfur, silicon or phosphorus atoms containing silicon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
    • Y02B80/10—Insulation, e.g. vacuum or aerogel insulation

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention relates to a manufacturing method of an aerogel felt. The manufacturing method of the aerogel felt has the beneficial effects that the aerogel slurry is firstly injected into the glass fiber felt, and a closed coating is formed on the surface of the glass fiber felt by using the soaking solution, so that the powder falling phenomenon of the aerogel felt in the storage, transportation and use processes is avoided, the aerogel amount in the aerogel felt is not reduced, and the thermal insulation property of the aerogel felt is not influenced.

Description

一種氣凝膠氈的製造方法A kind of manufacturing method of aerogel felt

本發明涉及氣凝膠氈的技術領域，尤其涉及一種氣凝膠氈的製造方法。The present invention relates to the technical field of aerogel felt, in particular to a manufacturing method of aerogel felt.

氣凝膠氈是以奈米二氧化矽氣凝膠為主體材料，通過特殊工藝，同玻璃纖維棉或預氧化纖維氈複合而成的柔性保溫氈。其特點是導熱係數低，有一定的抗拉及抗壓強度，便於保溫施工應用，屬於保溫材料。Aerogel felt is a flexible thermal insulation felt that is made of nano-silica aerogel as the main material and is compounded with glass fiber wool or pre-oxidized fiber felt through a special process. It is characterized by low thermal conductivity and certain tensile and compressive strength, which is convenient for thermal insulation construction and application, and belongs to thermal insulation materials.

但是，現有技術中，氣凝膠氈容易出現掉粉，不僅造成粉塵污染，還會降低氣凝膠氈的保溫性能。However, in the prior art, the aerogel felt is prone to powder falling, which not only causes dust pollution, but also reduces the thermal insulation performance of the aerogel felt.

本發明的目的在於克服現有技術存在的以上問題，提供一種氣凝膠氈的製造方法。The purpose of the present invention is to overcome the above problems existing in the prior art, and to provide a method for manufacturing an aerogel felt.

為實現上述技術目的，達到上述技術效果，本發明通過以下技術方案實現：In order to realize the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

一種氣凝膠氈製造方法，包括以下步驟： S10、氣凝膠粉體加入含有潤濕劑的水中，經攪拌，成氣凝膠漿料； S20、使用注射槍頭，把氣凝膠漿料注入到玻璃纖維氈中； S30、經過烘乾器烘乾玻璃纖維氈； S40、將水、丙烯酸類乳液、滑石粉、VAE乳液和水性固化劑混合後，攪拌均勻，配製成浸泡液； S50、將浸泡液倒入浸泡槽內，將烘乾的玻璃纖維氈放入浸泡槽中浸泡，當玻璃纖維氈表面附著有浸泡液後，將玻璃纖維氈通過烘乾機烘乾，製成氣凝膠氈。 A method for manufacturing an aerogel felt, comprising the following steps: S10, adding the aerogel powder to water containing a wetting agent, and stirring to form an aerogel slurry; S20. Use the injection gun head to inject the aerogel slurry into the glass fiber mat; S30, drying the glass fiber mat through a dryer; S40. After mixing water, acrylic emulsion, talcum powder, VAE emulsion and water-based curing agent, stir evenly to prepare a soaking solution; S50. Pour the soaking liquid into the soaking tank, and put the dried glass fiber mat into the soaking tank for soaking. When the soaking liquid is attached to the surface of the glass fiber mat, dry the glass fiber mat with a dryer to make air Gel felt.

其中，所述步驟S10中各組分按重量份數計算如下：氣凝膠粉體25~40份，潤濕劑5~10份，水72~98份。Wherein, each component in the step S10 is calculated in parts by weight as follows: 25-40 parts of aerogel powder, 5-10 parts of wetting agent, and 72-98 parts of water.

其中，所述步驟S40中各組分按重量份數計如下：水20~50份，丙烯酸類乳液20~55份，滑石粉5~10份，VAE乳液8~15份，水性固化劑0.5~1份。Wherein, each component in the step S40 is as follows in parts by weight: 20-50 parts of water, 20-55 parts of acrylic emulsion, 5-10 parts of talc, 8-15 parts of VAE emulsion, and 0.5-15 parts of water-based curing agent 1 serving.

其中，所述丙烯酸類乳液為純丙乳液、矽丙乳液和苯丙乳液中的一種。Wherein, the acrylic emulsion is one of pure acrylic emulsion, silicone-acrylic emulsion and styrene-acrylic emulsion.

其中，所述烘乾機的烘乾溫度為50~80℃。Wherein, the drying temperature of the dryer is 50-80°C.

本發明的有益效果是：先將氣凝膠漿料注入玻璃纖維氈中，然後用浸泡液在玻璃纖維氈表面形成一層封閉塗層，避免氣凝膠氈在儲運和使用過程中出現掉粉的現象，避免掉粉造成的粉塵污染，保證氣凝膠氈中的氣凝膠量不減少，進而不影響氣凝膠氈的保溫性能。The beneficial effect of the invention is that: firstly inject the aerogel slurry into the glass fiber mat, and then use the soaking liquid to form a layer of sealing coating on the surface of the glass fiber mat, so as to avoid the aerogel mat from falling off during storage, transportation and use. It can avoid dust pollution caused by powder drop, ensure that the amount of aerogel in the aerogel felt does not decrease, and thus does not affect the thermal insulation performance of the aerogel felt.

下面將參考附圖並結合實施例，來詳細說明本發明。The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

實施例一、一種氣凝膠氈的製造方法，包括以下步驟：Embodiment 1, a manufacturing method of aerogel felt, comprising the following steps:

S10、25份氣凝膠粉體加入含有5份潤濕劑的72份水中，經攪拌，成氣凝膠漿料；S10. Add 25 parts of aerogel powder to 72 parts of water containing 5 parts of wetting agent, and stir to form aerogel slurry;

S20、使用注射槍頭把氣凝膠漿料注入到玻璃纖維氈中；S20, inject the aerogel slurry into the glass fiber mat using an injection gun tip;

S30、經過烘乾器烘乾玻璃纖維氈；S30, drying the glass fiber mat through a dryer;

S40、將20份水、20份丙烯酸類乳液、5份滑石粉、8份VAE乳液和0.5份水性固化劑混合後，攪拌均勻，配製成浸泡液；S40. After mixing 20 parts of water, 20 parts of acrylic emulsion, 5 parts of talc, 8 parts of VAE emulsion and 0.5 part of water-based curing agent, stir evenly to prepare a soaking solution;

S50、將浸泡液倒入浸泡槽內，將烘乾的玻璃纖維氈放入浸泡槽中浸泡。當玻璃纖維氈表面附著有浸泡液後，將玻璃纖維氈通過烘乾機烘乾，製成氣凝膠氈。S50, pour the soaking liquid into the soaking tank, and soak the dried glass fiber mat into the soaking tank. After the soaking liquid is attached to the surface of the glass fiber mat, the glass fiber mat is dried by a dryer to make the aerogel mat.

丙烯酸類乳液為純丙乳液。Acrylic emulsion is pure acrylic emulsion.

烘乾機的烘乾溫度為50℃。The drying temperature of the dryer is 50°C.

水性固化劑具體的選用封閉型異氰酸酯固化劑。The water-based curing agent is specifically a blocked isocyanate curing agent.

實施例二、一種氣凝膠氈的製造方法，包括以下步驟：Embodiment 2, a manufacturing method of aerogel felt, comprising the following steps:

S10、32份氣凝膠粉體加入含有7份潤濕劑的82份水中，經攪拌，成氣凝膠漿料；S10. Add 32 parts of aerogel powder to 82 parts of water containing 7 parts of wetting agent, and stir to form aerogel slurry;

S20、使用注射槍頭把氣凝膠漿料注入到玻璃纖維氈中；S20, inject the aerogel slurry into the glass fiber mat using an injection gun tip;

S30、經過烘乾器烘乾玻璃纖維氈；S30, drying the glass fiber mat through a dryer;

S40、將37份水、41份丙烯酸類乳液、7份滑石粉、11份VAE乳液和0.7份水性固化劑混合後，攪拌均勻，配製成浸泡液；S40, after mixing 37 parts of water, 41 parts of acrylic emulsion, 7 parts of talc, 11 parts of VAE emulsion and 0.7 part of water-based curing agent, stir evenly to prepare a soaking solution;

S50、將浸泡液倒入浸泡槽內，將烘乾的玻璃纖維氈放入浸泡槽中浸泡。當玻璃纖維氈表面附著有浸泡液後，將玻璃纖維氈通過烘乾機烘乾，製成氣凝膠氈。S50, pour the soaking liquid into the soaking tank, and soak the dried glass fiber mat into the soaking tank. After the soaking liquid is attached to the surface of the glass fiber mat, the glass fiber mat is dried by a dryer to make the aerogel mat.

丙烯酸類乳液為矽丙乳液。The acrylic emulsion is a silicone-acrylic emulsion.

烘乾機的烘乾溫度為70℃。The drying temperature of the dryer is 70°C.

水性固化劑具體的選用封閉型異氰酸酯固化劑。The water-based curing agent is specifically a blocked isocyanate curing agent.

實施例三、一種氣凝膠氈的製造方法，包括以下步驟：Embodiment 3, a kind of manufacture method of aerogel felt, comprising the following steps:

S10、40份氣凝膠粉體加入含有10份潤濕劑的98份水中，經攪拌，成氣凝膠漿料；S10. Add 40 parts of aerogel powder to 98 parts of water containing 10 parts of wetting agent, and stir to form aerogel slurry;

S20、使用注射槍頭把氣凝膠漿料注入到玻璃纖維氈中；S20, inject the aerogel slurry into the glass fiber mat using an injection gun tip;

S30、經過烘乾器烘乾玻璃纖維氈；S30, drying the glass fiber mat through a dryer;

S40、將50份水、55份丙烯酸類乳液、10份滑石粉、15份VAE乳液和1份水性固化劑混合後，攪拌均勻，配製成浸泡液；S40. After mixing 50 parts of water, 55 parts of acrylic emulsion, 10 parts of talc, 15 parts of VAE emulsion and 1 part of water-based curing agent, stir evenly to prepare a soaking solution;

S50、將浸泡液倒入浸泡槽內，將烘乾的玻璃纖維氈放入浸泡槽中浸泡。當玻璃纖維氈表面附著有浸泡液後，將玻璃纖維氈通過烘乾機烘乾，製成氣凝膠氈。S50, pour the soaking liquid into the soaking tank, and soak the dried glass fiber mat into the soaking tank. After the soaking liquid is attached to the surface of the glass fiber mat, the glass fiber mat is dried by a dryer to make the aerogel mat.

丙烯酸類乳液為苯丙乳液。The acrylic emulsion is a styrene-acrylic emulsion.

烘乾機的烘乾溫度為80℃。The drying temperature of the dryer is 80°C.

水性固化劑具體的選用封閉型異氰酸酯固化劑。The water-based curing agent is specifically a blocked isocyanate curing agent.

發明原理：先將氣凝膠漿料注入玻璃纖維氈中，然後用浸泡液在玻璃纖維氈表面形成一層封閉塗層，避免氣凝膠氈在儲運和使用過程中出現掉粉的現象，避免掉粉造成的粉塵污染，保證氣凝膠氈中的氣凝膠量不減少，進而不影響氣凝膠氈的保溫性能。The principle of the invention: First inject the aerogel slurry into the glass fiber mat, and then use the soaking liquid to form a closed coating on the surface of the glass fiber mat to avoid the phenomenon of powder falling off during the storage, transportation and use of the aerogel mat. Dust pollution caused by falling powder ensures that the amount of aerogel in the aerogel felt does not decrease, thereby not affecting the thermal insulation performance of the aerogel felt.

對實施例一至實施例三中制得的氣凝膠氈進行導熱性檢測，檢測結果如表1。 表1 氣凝膠氈樣品 導熱係數 實施例一 0.02418 W/(m.k)，25℃ 實施例二 0.02407 W/(m.k)，25℃ 實施例三 0.02436 W/(m.k)，25℃ The thermal conductivity of the aerogel felts prepared in Examples 1 to 3 was tested, and the test results are shown in Table 1. Table 1 Aerogel Felt Sample Thermal Conductivity Example 1 0.02418 W/(mk), 25℃ Embodiment 2 0.02407 W/(mk), 25℃ Embodiment 3 0.02436 W/(mk), 25℃

從表1得知，本發明製備而得的氣凝膠氈導熱係數低，保溫性好。It is known from Table 1 that the aerogel felt prepared by the present invention has low thermal conductivity and good thermal insulation.

在本說明書的描述中，參考術語「一個實施例」、「示例」、「具體示例」等的描述意指結合該實施例或示例描述的具體特徵、結構、材料或者特點包含于本發明的至少一個實施例或示例中。在本說明書中，對上述術語的示意性表述不一定指的是相同的實施例或示例。而且，描述的具體特徵、結構、材料或者特點可以在任何的一個或多個實施例或示例中以合適的方式結合。In the description of this specification, description with reference to the terms "one embodiment," "example," "specific example," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention. in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

以上顯示和描述了本發明的基本原理、主要特徵和本發明的優點。本行業的技術人員應該瞭解，本發明不受上述實施例的限制，上述實施例和說明書中描述的只是說明本發明的原理，在不脫離本發明精神和範圍的前提下，本發明還會有各種變化和改進，這些變化和改進都落入要求保護的本發明範圍內。The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and modifications fall within the scope of the claimed invention.

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Claims (5)

一種氣凝膠氈的製造方法，包括以下步驟： S10、氣凝膠粉體加入含有潤濕劑的水中，經攪拌，成氣凝膠漿料； S20、使用注射槍頭，把氣凝膠漿料注入到玻璃纖維氈中； S30、經過烘乾器烘乾玻璃纖維氈； S40、將水、丙烯酸類乳液、滑石粉、VAE乳液和水性固化劑混合後，攪拌均勻，配製成浸泡液； S50、將浸泡液倒入浸泡槽內，將烘乾的玻璃纖維氈放入浸泡槽中浸泡，當玻璃纖維氈表面附著有浸泡液後，將玻璃纖維氈通過烘乾機烘乾，製成氣凝膠氈。 A manufacturing method of aerogel felt, comprising the following steps: S10, adding the aerogel powder to water containing a wetting agent, and stirring to form an aerogel slurry; S20. Use the injection gun head to inject the aerogel slurry into the glass fiber mat; S30, drying the glass fiber mat through a dryer; S40. After mixing water, acrylic emulsion, talcum powder, VAE emulsion and water-based curing agent, stir evenly to prepare a soaking solution; S50. Pour the soaking liquid into the soaking tank, and put the dried glass fiber mat into the soaking tank for soaking. When the soaking liquid is attached to the surface of the glass fiber mat, dry the glass fiber mat with a dryer to make air Gel felt. 根據請求項1所述氣凝膠氈的製造方法，其中所述步驟S10中各組分按重量份數計算如下：氣凝膠粉體25~40份，潤濕劑5~10份，水72~98份。According to the manufacturing method of the aerogel felt according to claim 1, wherein the components in step S10 are calculated as follows in parts by weight: 25-40 parts of aerogel powder, 5-10 parts of wetting agent, 72 parts of water ~98 servings. 根據請求項1所述氣凝膠氈的製造方法，其中所述步驟S40中各組分按重量份數計如下：水20~50份，丙烯酸類乳液20~55份，滑石粉5~10份，VAE乳液8~15份，水性固化劑0.5~1份。According to the manufacturing method of the aerogel felt according to claim 1, wherein the components in the step S40 are as follows in parts by weight: 20-50 parts of water, 20-55 parts of acrylic emulsion, and 5-10 parts of talcum powder , 8~15 parts of VAE emulsion, 0.5~1 part of water-based curing agent. 根據請求項1所述氣凝膠氈的製造方法，其中所述丙烯酸類乳液為純丙乳液、矽丙乳液和苯丙乳液中的一種。The manufacturing method of the aerogel felt according to claim 1, wherein the acrylic emulsion is one of pure acrylic emulsion, silicone-acrylic emulsion and styrene-acrylic emulsion. 根據請求項1所述氣凝膠氈的製造方法，其中所述烘乾機的烘乾溫度為50~80℃。The method for manufacturing an aerogel felt according to claim 1, wherein the drying temperature of the dryer is 50-80°C.
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