DE112022000025T5 - Thermal insulation felt with thermal shock resistance and manufacturing method therefor - Google Patents

Abstract

The present invention relates to a thermal shock resistant thermal insulation felt and a manufacturing method thereof. The thermal insulation felt has a layered structure and consists of a filled glass fiber layer and a thermal shock resistant coating, wherein the thermal shock resistant coating is applied on one side or both sides of the filled glass fiber layer; wherein the filler is hollow glass microbeads or SiO2 airgel; the thermal shock resistant coating being obtained by drying and curing a thermal shock resistant paint applied on one side or both sides of the filled glass fiber layer; wherein the composition and content of raw materials of the thermal shock resistant paint in weight percent are as follows: 10 to 50% of SiO2, 5 to 60% of ZnO, 5 to 40% of Al2O3, 5 to 15% of polytetrafluoroethylene, 5 to 35% of Silane coupling agent, 15 to 50% of phosphate. The thermal insulation felt produced according to the present application, after the glass fiber layer is filled with filler and coated with a thermal shock resistant coating, exhibits even more excellent thermal shock resistance.

Description

TECHNICAL AREA

The present application relates to the technical field of thermal insulation materials, and more particularly to a thermal insulation felt having thermal shock resistance and a manufacturing method thereof.

STATE OF THE ART

A battery electric vehicle (BEV) refers to a vehicle with advanced technical principles, new technology and new structure, which uses an on-board power supply as an energy source, whose wheels are driven by a motor, through the combination of the advanced technologies in the Vehicle power control and is formed in the vehicle drive. Due to the eco-friendly characteristics of the electric vehicle, it as a development trend of the future automobile industry. The most important part of this type of vehicle is its battery. Therefore, it is often necessary to cover the outside of the battery pack with materials such as thermal insulation felt for thermal insulation protection or for thermal insulation between lithium cells.

In related art, a thermal insulation felt is disclosed as a fiberglass felt composite, the fiberglass felt composite comprising layers of airgel felt and a layer of polyethylene, wherein the layer of polyethylene is sandwiched between two layers of airgel felt. The thermal insulation felt having the above-mentioned composite structure has better thermal insulation performance and can achieve the purpose of thermal insulation protection for the battery. However, the thermal insulation felt having the above-mentioned composite structure is poor in thermal shock resistance. After this thermal insulation felt is subjected to sharp temperature changes or cold-heat change within a certain initial temperature range, the structures of its airgel felt layer and polyethylene layer are easily damaged, which in turn leads to a significant reduction in its thermal insulation and protective effect. Therefore, it is necessary to periodically check or replace the thermal insulation felt, which brings great inconvenience to the user.

In summary, the current thermal insulation felt has poor thermal shock resistance despite its good thermal insulation and protective function.

CONTENTS OF THIS APPLICATION

In order to solve the above technical problem, the present application provides a thermal insulation felt having thermal shock resistance and a manufacturing method thereof, thereby ensuring that the thermal insulation felt has thermal insulation and protective performance and good thermal shock resistance at the same time.

In a first aspect, the present application provides a thermal shock resistant thermal insulation felt adopting the following technical solution: A thermal shock resistant thermal insulation felt having a layered structure and consisting of a glass fiber layer with filler and a thermal shock resistant coating, the thermal shock resistant coating on one side or both sides the fiberglass layer is applied with filler;
wherein the filler is hollow glass microbeads or SiO ₂ airgel; the thermal shock resistant coating being obtained by drying and curing a thermal shock resistant paint applied on one side or both sides of the filled glass fiber layer;
the composition and content of raw materials of the thermal shock resistant paint in percentage by weight are as follows: 10 to 50% of SiO ₂ , 5 to 60% of ZnO, 5 to 40% of Al ₂ O ₃ , 5 to 15% of polytetrafluoroethylene (im hereinafter referred to as PTFE), 5 to 35% of silane coupling agent, 15 to 50% of phosphate.

In the above technical solution, thermal insulation felt with the glass fiber layer as the base layer can be protected by the filler filled in the glass fiber layer and the thermal shock resistant coating applied on both sides of the glass fiber
provide thermal insulation protection and on this basis have excellent thermal shock resistance.

The use of the filler not only strengthens the mechanical properties of the fiberglass layer by filling, but also improves the overall high-temperature resistance of the fiberglass layer through the high-temperature resistance of the filler itself, so that the thermal insulation felt is not easily deformed in the event that it is subjected to a sharp temperature change and has strong structural stability, ensuring the high temperature resistance and thermal insulation performance of the thermal insulation felt.

The thermal shock resistant coating is on the outside of the fiberglass layer and protects and reinforces the fiberglass layer, reducing the temperature impact on the fiberglass layer and making its internal structure less susceptible to damage from drastic temperature changes. Compared to the thermal insulation felt without a thermal shock-resistant coating, the thermal conductivity value of the thermal insulation felt according to the invention is reduced by 35 to 85% at 25° C., with the rupture time of the thermal insulation felt according to the invention at 1000° C. and an air pressure of 5 bar being increased by 77 to 210%. From this, it can be seen that the thermal shock resistant coating significantly improves the thermal insulation performance and thermal shock resistance of the thermal insulation felt.

During application, the layer thickness applied is preferably regulated to 0.02 to 1.5 mm, with the temperature for curing being regulated to 250 to 500° C. for 1 to 5 hours during drying and curing.

In the above technical solution, the composite effect of the thermal shock resistant coating cured at the above temperature and heating time and that of the glass fiber layer is better; the reason could be that under the above process conditions, the thermal shock resistant coating can penetrate into the glass fiber layer, and then after curing, it can effectively reduce the temperature influence on the glass fiber layer.

If the temperature and heating time are higher than the above process conditions, the heat insulation effect will be lost; the reason for this could be that: since most of the thermal shock resistant coating penetrates into the glass fiber layer, the thermal shock resistant coating on the surface of the glass fiber layer cannot effectively isolate the temperature influence on the glass fiber layer, and under the above temperature conditions, the glass fiber is easily softened and its inner structure changes.

It should also be noted that, in general, the higher the coating thickness, the better the performance. However, based on actual usage requirements and manufacturing costs, the preferred applied layer thickness is 0.02 to 1.5 mm, although higher thicknesses may be selected for applications, which should not be construed as a limitation of the present application.

It is preferably provided that the phosphate in the thermal shock resistant paint is one or more of dihydrogen phosphate, hydrogen phosphate, orthophosphate and metaphosphate.

In the above technical solution, the phosphate of the above components is a refractory material whose main compound is acid orthophosphate or condensed phosphate and which has gelling properties. After the phosphate is heated, the phosphoric acid component can react and combine with alkali metals or amphoteric oxides and their hydroxides, and play a role in coagulation and hardening, thereby imparting excellent thermal shock resistance to the thermal shock resistant coating.

And when a variety of phosphates are used in combination, the three-dimensional crosslinked structure formed by them is crosslinked, which greatly improves its cohesion, and effectively contribute to coagulation and hardening, thereby ensuring the thermal shock resistance of the thermal shock resistant coating.

It is preferably provided that the glass fiber layer is a glass fiber fabric or a glass fiber felt, the glass fiber fabric or the glass fiber felt being produced from glass fibers; wherein the glass fiber layer has a thickness of 1.0 to 3.0 mm and a weaving density of warp and weft of 15 to 30 pieces/cm.

In the above technical solution, the above-mentioned glass fiber cloth and glass fiber felt used as the glass fiber sheet exhibit better performance.

The higher the thickness, the better the thermal insulation performance. If the weave density is too low, glass microbeads have fewer binding sites. If the weaving density is too large, the injection of glass microbeads will be affected, resulting in deterioration of the thermal insulation performance and temperature resistance of the thermal insulation felt. In this case, the interfiber space of the glass fiber felt is more disordered than the glass fiber fabric, which is advantageous for the thermal insulation performance; and the glass fiber felt is lighter than the glass fiber cloth, but the tensile strength is reduced.

It is preferably provided that the glass fiber is a continuous glass fiber with a diameter of 6 to 24 μm, the glass fiber comprising one or more fibers selected from the “Z-Tex Series”: Z-Tex™, Z-Tex plus™, Z-Tex super™, Z-Tex ultra™ is.

In the above technical solution, it is envisaged that the glass fiber sheet woven from the above types of glass fibers after filling with glass microbeads will have a compact and stable structure, not easily deformed due to heat and other reasons, and can provide more bonding sites for the thermal shock resistant coating, so that the bonding of the thermal shock resistant coating becomes more stable and compact. The performance is best when using Z-Tex ultra fiberglass, which has high tensile strength, high temperature resistance and better resistance to thermal shock.

Preferably, it is envisaged that the composition and content of raw materials of the hollow glass microbeads in weight percent are as follows: 50 to 80% of SiO ₂ , 10 to 70% of Al ₂ O ₃ , 10 to 30% of ZrO ₂ .

In the above technical solution, it is envisaged that the above fillers can not only bond with the glass fiber layer, but also impart excellent high temperature resistance and thermal insulation performance to the glass fiber layer with their own high temperature resistance.

It is preferably provided that the particle size of the hollow glass microbeads is less than or equal to 100 μm, the weight ratio of the hollow glass microbeads used to the glass fiber fabric or glass fiber felt being used being 1:(3 to 7).

In the above technical solution, it is intended that the hollow glass microbeads with the above specific gravity fraction not only continue to ensure the filling density and strength of the glass fiber layer filled with the hollow glass microbeads, but also cannot easily affect the uniformity and bonding strength of the coating, thereby increasing the high temperature resistance and ensure the thermal insulation performance of the fiberglass layer.

Preferably, it is contemplated that the silane coupling agent is one or more of KH-550, KH-570, KH602, KH792, Sj-42.

In the above technical solution, the silane coupling agent of the above components is designed to effectively improve the bonding strength between the thermal shock resistant coating and the glass fiber layer. Then the thermal shock resistant coating can be bonded on both sides of the glass fiber layer and exert a protective and heat insulating effect on the glass fiber layer. When a plurality of silane coupling agents are used in combination, a cross-linkage of the three-dimensional structure, which has a stronger structure and is more sticky, can be formed.

• Ein Herstellungsverfahren für Wärmedämmfilz mit Thermoschockbeständigkeit, umfassend folgende Schritte:
  • S1: Herstellen einer Glasfaserschicht;
    • 1) Wenn die Glasfaserschicht ein Glasfasergewebe ist, wird das Glasfasergewebe durch ein Webverfahren erhalten;
    • 2) Wenn die Glasfaserschicht ein Glasfaserfilz ist, kann der Glasfaserfilz durch ein beliebiges Verfahren des Nadelstanzens, Nassverfahrens und Trockenverfahrens erhalten werden;
  • S2: Herstellen einer Glasfaserschicht mit Füllstoff: Einspritzen eines Füllstoffs in die Glasfaserschicht, um die Glasfaserschicht mit Füllstoff zu erhalten;
  • S3: Herstellen einer thermoschockbeständigen Beschichtung: Auftragen einer thermoschockbeständigen Farbe auf beiden Seiten der Glasfaserschicht mit Füllstoff unter Verwendung eines Walzenbeschichtungs-, Kalandrier- und Rakelbeschichtungsprozesses, wobei die aufgetragene Schichtdicke auf 0,02 bis 1,0 mm geregelt wird, wonach die aufgetragene thermoschockbeständige Farbe bei einer kontrollierten Temperatur von 250 bis 500°C für 1 bis 5 Stunden ausgehärtete wird, um einen Wärmedämmfilz mit Thermoschockbeständigkeit zu erhalten.

In a second aspect, the present application provides a manufacturing method for thermal insulation felt with thermal shock resistance, adopting the following technical solution:

• A manufacturing process for thermal insulation felt with thermal shock resistance, comprising the following steps:
  • S1: Production of a glass fiber layer;
    • 1) When the glass fiber layer is a glass fiber cloth, the glass fiber cloth is obtained by a weaving process;
    • 2) When the glass fiber layer is a glass fiber felt, the glass fiber felt can be obtained by any of needle punching, wet process and dry process;
  • S2: Making a filled glass fiber layer: injecting a filler into the glass fiber layer to obtain the filled glass fiber layer;
  • S3: Making a thermal shock resistant coating: Applying a thermal shock resistant paint on both sides of the glass fiber layer with filler using roll coating, calendering and knife coating process, controlling the applied layer thickness to 0.02~1.0mm, after which the applied thermal shock resistant paint curing at a controlled temperature of 250 to 500°C for 1 to 5 hours to obtain a thermal insulation felt with thermal shock resistance.

In the above technical solution, the thermal insulation felt produced by the above process is intended to have stable and uniform performance and excellent thermal insulation performance, which can meet the needs of downstream applications and at the same time is easy to manufacture in terms of the overall process, and thus suitable for industrial mass production is.

• Eine thermoschockbeständige Farbe, deren Zusammensetzung und Gehalt von Rohstoffen in Gewichtsprozent wie folgt sind: 10 bis 50 % von SiO₂, 5 bis 60 % von ZnO, 5 bis 40 % von Al₂O₃, 5 bis 15 % von PTFE, 5 bis 35 % von Silan-Haftvermittler, 15 bis 50 % von Phosphat.

In a third aspect, the present application provides a thermal shock resistant paint that adopts the following technical solution:

• A thermal shock resistant paint, the composition and content of raw materials in weight percent are as follows: 10 to 50% of SiO ₂ , 5 to 60% of ZnO, 5 to 40% of Al ₂ O ₃ , 5 to 15% of PTFE, 5 bis 35% of silane coupling agent, 15 to 50% of phosphate.

In the above technical solution, it is envisaged that the thermal shock resistant paint of the above components can be dried and cured on the outside of the fiberglass layer to form a thermal shock resistant coating that protects the fiberglass layer. This imparts the thermal shock resistance to the thermal insulation felt while reducing the influence of temperature on the glass fiber layer, which in turn makes the internal structure of the glass fiber layer not easily damaged by drastic temperature changes.

1. 1. Bei der vorliegenden Anmeldung werden durch das Einfüllen von Füllstoffen und das Beschichten mit thermoschockbeständiger Beschichtung dem Wärmedämmfilz hervorragende mechanische Eigenschaften und eine Wärmebeständigkeit verliehen, wobei der Wärmedämmfilz im Fall, dass er starken Temperaturänderungen oder hohen Temperaturen ausgesetzt wird, aufgrund der Verformung der inneren Struktur nicht leicht beschädigt wird.
2. 2. Das Herstellungsverfahren der vorliegenden Anmeldung ist relativ einfach. Dieses Herstellungsverfahren ist für die industrielle Massenproduktion geeignet, während ein durch dieses Herstellungsverfahren hergestelltes Produkts eine hervorragende Wärmeisolationsleistung sowie eine hervorragende mechanische Eigenschaft aufweist, die die tatsächlichen Anforderungen nachgeschalteter Anwendungen erfüllen können.
3. 3. Die thermoschockbeständige Farbe der vorliegenden Anmeldung hat eine bessere Thermoschockbeständigkeit, und kann nach ihrem Trocknen und Aushärten auf der Oberfläche der Glasfaserschicht die Wärmeisolationsleistung und Thermoschockbeständigkeit der Glasfaserschicht wirksam sicherstellen.
4. 4. Der schließlich in der vorliegenden Anmeldung erhaltene Wärmedämmfilz kann zum Wärmedämmschutz von Akkus von Fahrzeugen mit neuer Energie, zum Wärmedämmschutz von Materialien der nationalen Verteidigungsluftfahrt, zur Konservierung von medizinischen und sanitären Produkten und von Wärmedämmmaterialien für Gebäude verwendet werden, und kann eine bessere Wärmeisolationsleistung ausüben.

In summary, the present application has the following beneficial effects:

1. 1. In the present application, by filling fillers and coating with thermal shock resistant coating, excellent mechanical properties and heat resistance are imparted to the thermal insulation felt, in the case of being exposed to sharp temperature changes or high temperatures, the thermal insulation felt due to the deformation of the internal structure not easily damaged.
2. 2. The manufacturing process of the present application is relatively simple. This manufacturing method is suitable for industrial mass production, while a product manufactured by this manufacturing method has excellent thermal insulation performance as well as excellent mechanical property, which can meet the actual needs of downstream applications.
3. 3. The thermal shock resistant paint of the present application has better thermal shock resistance, and after drying and curing it on the glass fiber layer surface, it can effectively ensure the thermal insulation performance and thermal shock resistance of the glass fiber layer.
4. 4. The thermal insulation felt finally obtained in the present application can be used for thermal insulation protection of batteries of new energy vehicles, thermal insulation protection of national defense aviation materials, preservation of medical and sanitary products and thermal insulation materials for buildings, and can exert better thermal insulation performance .

DETAILED EMBODIMENTS

Hereinafter, the present application will be detailed with reference to working examples.

• SiO₂, ZnO und Al₂O₃, jeweils mit einer Partikelgröße von 2 bis 10 µm, bezogen von Sinopharm Chemical Reagent Co., Ltd.;
• PTFE, mit einem Polymerisationsgrad von 60 bis 200 * 104, bezogen von Sinopharm Chemical Reagent Co., Ltd.;
• hohle Glasmikroperlen, mit einer Partikelgröße von ≤ 100 µm, bezogen von Minnesota Mining & Manufacturing Company;
• Z-Tex-Serie: Z-Tex™, Z-Tex plus™, Z-Tex super™, Z-Tex ultra™, bezogen von Shanghai Guobo Automotive Science and Technology Co., Ltd., mit folgenden Leistungen:

Z-Tex Series Z-Tex™ Z-Tex plus™ Z-Tex super™ Z-Tex ultra™ Länge (mm) Endlosgarn, schneidbar Durchmesser (µm) 6-24 6-24 6-24 6-24 Erweichungstemperatur (°C) 905-915 920-930 945-950 1500 Dauertemperaturbeständigkeit (°C) 760 790 820 1000 The raw materials used in individual exemplary embodiments of the present application are commercially available, with the exception of the raw materials specified below:

• SiO ₂ , ZnO and Al ₂ O ₃ each having a particle size of 2 to 10 µm, purchased from Sinopharm Chemical Reagent Co., Ltd.;
• PTFE having a degree of polymerization of 60 to 200*10 4 supplied by Sinopharm Chemical Reagent Co., Ltd.;
• hollow glass microbeads, having a particle size of ≤ 100 µm, obtained from Minnesota Mining & Manufacturing Company;
• Z-Tex Series: Z-Tex™, Z-Tex plus™, Z-Tex super™, Z-Tex ultra™, sourced from Shanghai Guobo Automotive Science and Technology Co., Ltd., with the following features:

Z-Tex Series Z-Tex™ Z-Tex plus™ Z-Tex super™ Z-Tex ultra™ length (mm) Endless yarn, cuttable Diameter (µm) 6-24 6-24 6-24 6-24 softening point (°C) 905-915 920-930 945-950 1500 Continuous temperature resistance (°C) 760 790 820 1000

Tests to check performance

Thermal insulation felts, which are manufactured in working examples and comparative examples, respectively, are selected as test items. Each group of thermal insulation felts is tested for thermal insulation performance and thermal shock resistance, respectively. The exam steps are as follows:

1) Thermal insulation performance test

A heat insulating felt of the group to be tested is made into five samples of 50mm*50mm*2.5mm, which are tested with a thermal conductivity meter (Model: Hot Disk TPS 2500S, purchased from Sweden Hot Disk Company).

Test steps: The five samples are stacked and then placed in a sample holder and clamped there. Then click on the "Confirm" and "Start Test" icons on the operation interface of the thermal conductivity meter to start the test; and the test results are averaged.

2) Thermal shock resistance test

A heat insulating felt of the group to be tested is made into five samples of 50mm*50mm*2.5mm, and thermal shock resistance is tested by using an air pressure flame spray gun. The flame temperature is set to 1000 °C and the air pressure to 5 bar. The side of the samples applied with the thermal shock resistant coating is tested, with the time to sample failure, i. H. Length of time for pinholes to appear on the sample is recorded and its average value taken.

exemplary embodiments

Example 1

A thermal shock resistant insulating felt consisting of a filled glass fiber layer and a thermal shock resistant coating applied to each side of the filled glass fiber layer;
the filler being hollow glass microbeads or whose composition and content of raw materials in weight percent are as follows: 50 to 80% of SiO ₂ , 10 to 70% of Al ₂ O ₃ , 10 to 30% of ZrO ₂ ;
the thermal shock resistant coating being obtained by drying and curing a thermal shock resistant paint applied on both sides of the filled fiberglass layer;
the composition and content of raw materials of the thermal shock resistant paint in weight percent are as follows: 25% of SiO ₂ , 30% of ZnO, 5% of Al ₂ O ₃ , 5% of PTFE, 15% of silane coupling agent, 20% of phosphate;
wherein the silane coupling agent is KH-550 and wherein the phosphate is dihydrogen phosphate.

• S1: Herstellen einer Glasfaserschicht; Die Glasfaserschicht ist ein durch ein Webverfahren hergestelltes Glasfasergewebe. Nachdem Glasfasern anfänglich verdrillt, chargenweise verzogen, verzogen und durch einen Webstuhl gewebt wurden, kann das Glasfasergewebe erhalten werden; wobei die verwendete Glasfaser Z-Tex™ ist, deren Länge 25 mm beträgt und deren Durchmesser 10 µm beträgt, wobei das erhaltene Glasfasergewebe eine Dicke von 2,0 mm und eine Webdichte der Kette oder des Schusses von 15 Stück/cm aufweist.
• S2: Herstellen einer Glasfaserschicht mit Füllstoff: Zunächst wird die Glasfaserschicht in eine geschlossene kreisförmige Form mit Rohren gelegt, wonach der Luftdruck auf 10 Bar geregelt wird, wobei der Füllstoff in einem Gewichtsverhältnis von 1:5 durch acht gleichmäßig angeordnete Gruppen von Rohren in die Hohlräume der Glasfaserschicht eingefüllt wird, um eine Glasfaserschicht mit Füllstoff zu erhalten.
• S3: Herstellen einer thermoschockbeständigen Beschichtung: Auftragen einer thermoschockbeständigen Farbe auf beiden Seiten der Glasfaserschicht mit Füllstoff unter Verwendung eines Walzenbeschichtungs-, Kalandrier- und Rakelbeschichtungsprozesses, wobei das vorliegende Ausführungsbeispiel am Beispiel des Walzenbeschichtungsprozesses beschrieben wird, wobei die spezifischen Schritte wie folgt sind:

A manufacturing process for the above thermal shock resistant insulating felt includes the following steps:

• S1: Production of a glass fiber layer; The glass fiber layer is a glass fiber fabric produced by a weaving process. After glass fibers are initially twisted, batch-drafted, warped and woven by a loom, the glass fiber fabric can be obtained; the glass fiber used is Z-Tex™, the length of which is 25 mm and the diameter of which is 10 µm, the glass fiber fabric obtained having a thickness of 2.0 mm and a warp or weft weave density of 15 pieces/cm.
• S2: Making a fiberglass layer with filler: First, the fiberglass layer is placed in a closed circular mold with tubes, after which the air pressure is regulated to 10 bar, with the filler being injected into the cavities in a weight ratio of 1:5 through eight evenly spaced groups of tubes of the glass fiber layer is filled to obtain a glass fiber layer with filler.
• S3: Making a thermal shock resistant coating: Applying a thermal shock resistant paint to both sides of the filled glass fiber layer using a roll coating, calendering and blade coating process, the present embodiment will be described taking the roll coating process as an example, the specific steps are as follows:

The individual raw materials of the thermal shock resistant paint are mixed uniformly to obtain the thermal shock resistant paint, which is then placed in a slurry tray of a roller coating device, after which the device is started to carry out the application of both sides of the glass fiber layer with filler, with the applied layer thickness is the same on both sides and is 0.3 mm; after the application is completed, the temperature for curing is controlled at 250°C for 1 hour to obtain a thermal insulation felt having thermal shock resistance, the measured actual thickness of the thermal shock resistant coating being 0.15 mm.

Examples 2 to 8

A heat-insulating felt having thermal shock resistance, which differs from Embodiment 1 in that the components and respective weights of the thermal shock resistant paint based on 100 kg are different as shown in Table 1, with other aspects being the same as Embodiment 1.

Comparative example 1

A thermal insulation felt is the same as in embodiment 1 except that it does not have a thermal shock resistant coating applied to both sides of the filled fiberglass layer, respectively.

Comparative example 2

A thermal insulation felt is the same as in Embodiment 1 except that the ZnO in the thermal shock resistant paint is replaced with the same amount of B ₂ O ₃ .

Comparative example 3

A thermal insulation felt is the same as in embodiment 1 except that the Al ₂ O ₃ in the thermal shock resistant paint is replaced with the same amount of B ₂ O ₃ .

Comparative example 4

A thermal insulation felt is the same as in embodiment 1, except that the thermal shock resistant paint for making the thermal shock resistant coating is composed of the following components in weight percent: 5% of SiO ₂ , 10% of ZnO, 10% of Al ₂ O ₃ , 20% of PTFE, 45% of silane coupling agent, 10% of phosphate.

Comparative example 5

A thermal insulation felt is the same as in embodiment 1, except that the thermal shock resistant paint for making the thermal shock resistant coating is composed of the following components in weight percent: 5% of SiO ₂ , 20% of Al ₂ O ₃ , 20% of PTFE, 45% of silane coupling agent, 10% of phosphate.

The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 1 to 8 and Comparative Examples 1 to 5 were tested. The test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts with thermal shock resistance obtained in Working Examples 1 to 8 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25°C being only 0.03 to 0.13W/(K·m) and their rupture time at 1000 °C and at an air pressure of 5 bar is 53 to 93 minutes. This shows that the thermal-shock resistant felt of the present application can ensure the thermal insulation performance of the thermal-insulating felt while effectively improving the thermal-shock resistance of the thermal-insulating felt due to the presence of two thermal shock-resistant layers, namely an inner and an outer thermal shock-resistant layer. The reason for this could be that the two thermal shock resistant layers, inner and outer thermal shock resistant layers, with the above-mentioned special components, have a more compact structure and higher strength due to their application on both sides of the glass fiber filled layer, and thus the Glass fiber layer can effectively protect and reinforce, with the glass fiber layer structure in between not easily affected by temperature.

In particular, the thermal insulation felt with thermal shock resistance obtained in Embodiment 4 has superior thermal insulation performance and thermal shock performance, with its thermal conductivity being improved 25°C is only 0.03 W/(K m) and its rupture time at 1000 °C and at air pressure of 5 bar is up to 93 minutes.

Further, it can be seen from the above table that compared to Embodiment 1, the thermal conductivity of the thermal insulation felt of Comparative Example 1 is up to 0.20 W/(K·m) at 25°C and 566% higher than that due to the absence of a thermal shock resistant coating of embodiment 1, the rupture time at 1000°C and at air pressure of 5 bar is only 30 minutes, which is 68% shorter than that of embodiment 1.

It can be seen that in the absence of the sealing and strength support provided by the inner and outer thermal shock resistant layers, the thermal insulation performance and thermal shock resistance of the thermal insulation felt is not as good as a thermal insulation felt of the present application, although the thermal insulation felt still has some thermal insulation performance and thermal shock resistance.

Further, as can be seen from the above table, compared to Embodiment 1, the thermal conductivity of the thermal insulation felt of Comparative Examples 2 to 3 at 25°C is up to 0.16 to 0.21 W/(K·m) and 357 to 500% higher than that of embodiment 1, the rupture time at 1000°C and at air pressure of 5 bar is only 32 to 35 minutes, which is 62 to 66% shorter than that of embodiment 1. Further, it can be seen from the above table that compared to Embodiment 1, the thermal conductivity of the thermal insulation felt of Comparative Examples 4 to 5 at 25°C is up to 0.18 to 0.25 W/(K·m) and 414 to 614% higher than that of embodiment 1, the rupture time at 1000°C and at air pressure of 5 bar is only 30 to 33 minutes, which is 65 to 68% shorter than that of embodiment 1.

This shows that the two thermal shock resistant layers, namely an inner and an outer thermal shock resistant layer, with a more compact structure and higher strength can be obtained only by applying the thermal shock resistant paint with specific components and contents on both sides of the filled glass fiber layer , where different components or different contents affect the compact structure and impact resistance of the thermal shock resistant layers, which in turn leads to a significant decrease in the thermal insulation performance and thermal shock resistance of the thermal insulation felt.

In summary, the thermal insulation felt, which has a glass fiber layer with filler, is given excellent thermal shock resistance by the glass microbeads filled in the glass fiber layer and the two thermal shock resistant coatings, namely the inner and outer thermal shock resistant coatings, on the basis that the thermal insulation felt has a thermal insulation line. Thereby, the filled glass microbeads can improve the performance of the glass fiber layer by its own high temperature resistance and strength, while the two thermal shock resistant coatings, namely inner and outer thermal shock resistant coating, protect and strengthen the glass fiber layer, and reduce the damage of the inner structure of the glass fiber layer by drastic temperature changes.

Example 9

A thermal insulation felt is the same as in embodiment 1 except that it has the thermal shock resistant coating applied to only one side of the filled glass fiber layer.

Aus der vorstehenden Tabelle ist ersichtlich, dass der im Ausführungsbeispiel 9 erhaltene Wärmedämmfilz immer noch eine bessere Wärmeisolationsleistung und Thermoschockbeständigkeit aufweist, wobei seine Wärmeleitfähigkeit bei 25°C nur 0,038 W/(K·m) beträgt und nur 0,003 W/(K·m) niedriger als die vom Ausführungsbeispiel 1 ist, wobei die Bruchzeit bei 1000 °C und bei Luftdruck von 5 Bar bis zu 75 Minuten beträgt und nur 10 min kürzer als die vom Ausführungsbeispiel 1 ist. Dies zeigt, dass die einseitige thermoschockbeständigen Beschichtung auch die Wärmeisolationsleistung und die Thermoschockbeständigkeit des Wärmedämmfilzes effektiv verbessern kann, wobei das Auftragen thermoschockbeständiger Beschichtung hauptsächlich von der tatsächlichen Anwendungsumgebung, d.h., der Position des zu schützenden Akkus, abhängt und basierend auf dem tatsächlichen Nutzungsbedarf und den Produktionskosten angepasst werden kann, was nicht als Einschränkung der vorliegenden Anmeldung angesehen werden sollte.The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above working example 9 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felt obtained in Working Example 9 still has superior thermal insulation performance and thermal shock resistance, with its thermal conductivity at 25°C being as low as 0.038 W/(K m) and as low as 0.003 W/(K m) is lower than that of embodiment 1, the rupture time at 1000°C and at air pressure of 5 bar is up to 75 minutes and is only 10 minutes shorter than that of embodiment 1. This shows that the single-side thermal shock resistant coating can also effectively improve the thermal insulation performance and thermal shock resistance of the thermal insulation felt, applying thermal shock resistant coating mainly depends on the actual application environment, that is, the location of the battery to be protected, and based on the actual use needs and production costs can be customized, which should not be construed as a limitation of the present application.

Example 10

• Die aufgetragene Schichtdicke der thermoschockbeständigen Beschichtung beträgt 0,1 mm. Nachdem die thermoschockbeständige Farbe auf beide Seiten der Glasfaserschicht aufgetragen wurde, wird sie 1 Stunde lang bei 250°C ausgehärtet. Die gemessene tatsächliche Dicke der thermoschockbeständigen Beschichtung nach dem Trocknen und Aushärten beträgt 0,05 mm.

A thermal insulation felt is the same as in Embodiment 1 except that the process of applying the thermal shock resistant coating in step S3 is different as follows:

• The applied layer thickness of the thermal shock resistant coating is 0.1 mm. After the thermal shock resistant paint is applied to both sides of the fiberglass layer, it is cured at 250°C for 1 hour. The measured actual thickness of the thermal shock resistant coating after drying and curing is 0.05 mm.

Example 11

• Die aufgetragene Schichtdicke der thermoschockbeständigen Beschichtung beträgt 1,0mm. Nachdem die thermoschockbeständige Farbe auf beide Seiten der Glasfaserschicht aufgetragen wurde, wird sie 1 Stunde lang bei 250°C ausgehärtet. Die gemessene tatsächliche Dicke der thermoschockbeständigen Beschichtung nach dem Trocknen und Aushärten beträgt 0,5mm.

A thermal insulation felt is the same as in Embodiment 1 except that the process of applying the thermal shock resistant coating in step S3 is different as follows:

• The applied layer thickness of the thermal shock resistant coating is 1.0mm. After the thermal shock resistant paint is applied to both sides of the fiberglass layer, it is cured at 250°C for 1 hour. The measured actual thickness of the thermal shock resistant coating after drying and curing is 0.5mm.

Example 12

• Die aufgetragene Schichtdicke der thermoschockbeständigen Beschichtung beträgt 2,0mm. Nachdem die thermoschockbeständige Farbe auf beide Seiten der Glasfaserschicht aufgetragen wurde, wird sie 1 Stunde lang bei 250°C ausgehärtet. Die gemessene tatsächliche Dicke der thermoschockbeständigen Beschichtung nach dem Trocknen und Aushärten beträgt 1,0mm.

A thermal insulation felt is the same as in Embodiment 1 except that the process of applying the thermal shock resistant coating in step S3 is different as follows:

• The applied layer thickness of the thermal shock resistant coating is 2.0mm. After the thermal shock resistant paint is applied to both sides of the fiberglass layer, it is cured at 250°C for 1 hour. The measured actual thickness of the thermal shock resistant coating after drying and curing is 1.0mm.

Example 13

• Die aufgetragene Schichtdicke der thermoschockbeständigen Beschichtung beträgt 0,3mm. Nachdem die thermoschockbeständige Farbe auf beide Seiten der Glasfaserschicht aufgetragen wurde, wird sie 5 Stunde lang bei 250°C ausgehärtet. Die gemessene tatsächliche Dicke der thermoschockbeständigen Beschichtung nach dem Trocknen und Aushärten beträgt 0,15mm.

A thermal insulation felt is the same as in Embodiment 1 except that the process of applying the thermal shock resistant coating in step S3 is different as follows:

• The applied layer thickness of the thermal shock resistant coating is 0.3mm. After the thermal shock resistant paint is applied to both sides of the fiberglass layer, it is 5 Cured at 250°C for 1 hour. The measured actual thickness of the thermal shock resistant coating after drying and curing is 0.15mm.

Example 14

• Die aufgetragene Schichtdicke der thermoschockbeständigen Beschichtung beträgt 0,3mm. Nachdem die thermoschockbeständige Farbe auf beide Seiten der Glasfaserschicht aufgetragen wurde, wird sie 5 Stunde lang bei 500°C ausgehärtet. Die gemessene tatsächliche Dicke der thermoschockbeständigen Beschichtung nach dem Trocknen und Aushärten beträgt 0,15mm.

A thermal insulation felt is the same as in Embodiment 1 except that the process of applying the thermal shock resistant coating in step S3 is different as follows:

• The applied layer thickness of the thermal shock resistant coating is 0.3mm. After the thermal shock resistant paint is applied to both sides of the fiberglass layer, it is cured at 500°C for 5 hours. The measured actual thickness of the thermal shock resistant coating after drying and curing is 0.15mm.

Example 15

• Die aufgetragene Schichtdicke der thermoschockbeständigen Beschichtung beträgt 0,3mm. Nachdem die thermoschockbeständige Farbe auf beide Seiten der Glasfaserschicht aufgetragen wurde, wird sie 6 Stunde lang bei 600°C ausgehärtet. Die gemessene tatsächliche Dicke der thermoschockbeständigen Beschichtung nach dem Trocknen und Aushärten beträgt 0,15mm.

A thermal insulation felt is the same as in Embodiment 1 except that the process of applying the thermal shock resistant coating in step S3 is different as follows:

• The applied layer thickness of the thermal shock resistant coating is 0.3mm. After the thermal shock resistant paint is applied to both sides of the fiberglass layer, it is cured at 600°C for 6 hours. The measured actual thickness of the thermal shock resistant coating after drying and curing is 0.15mm.

The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 10 to 15 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts obtained in Working Examples 10 to 14 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25°C being only 0.028 to 0.060 W/(K m) and their breaking time at 1000°C and at an air pressure of 5 bar is 50 to 95 minutes. This shows that the composite effect of the thermal shock resistant coating having the above applied layer thickness cured under the above temperature and heating time and the glass fiber layer is good. The reason for this could be that the thermal shock resistant coating breaks down under the above process conditions wise can penetrate into the glass fiber layer and then after curing can effectively reduce the temperature influence on the glass fiber layer.

In particular, when the temperature is higher than 500°C and the heating time is longer than 5 hours, the heat insulation effect is significantly reduced. Reference is made to embodiment 15, wherein the thermal conductivity at 25°C is 0.11 W/(K·m) and the rupture time at 1000°C and air pressure of 5 bar is only 38 minutes. The reason for this may be as follows: since most of the thermal shock resistant coating penetrates into the glass fiber layer, the thermal shock resistant coating on the surface of the glass fiber layer cannot effectively isolate the temperature influence on the glass fiber layer, and under the above temperature conditions, the glass fiber is easily softened and its inner structure changes.

Further, it can be seen from the above table that the thermal insulation felt manufactured in working example 12 has superior thermal insulation performance and thermal shock performance, with its thermal conductivity at 25°C being as low as 0.028W/(K m) and its rupture time at 1000°C and at atmospheric pressure of 5 bar is up to 95 minutes. From this, it can be seen that Embodiment 12 is the best embodiment, and the thermal shock resistant coating applied under this process condition can effectively reduce the influence of the outside temperature on the glass fiber layer, thereby achieving a significant improvement in the performance of the thermal insulation felt.

In summary, the thermal shock resistant coating cured at the above temperature and heating time has a good bonding effect with the glass fiber layer and is applied on the outside of the glass fiber layer to protect and reinforce the glass fiber layer. This reduces the temperature influence on the glass fiber layer and at the same time makes the glass fiber layer less prone to damage the internal structure by drastic temperature changes, and then gives the thermal insulation felt excellent thermal insulation performance and thermal shock resistance.

Example 16

A heat-insulating felt having thermal shock resistance is the same as in embodiment 1 except that the phosphate of the thermal shock resistant coating consists of dihydrogen phosphate and hydrogen phosphate in a weight ratio of 1:1.

Example 17

A thermal shock resistant thermal insulation felt is the same as in embodiment 1 except that the phosphate of the thermal shock resistant coating consists of dihydrogen phosphate and orthophosphate in a weight ratio of 1:1.

Example 18

A heat-insulating felt having thermal shock resistance is the same as in Embodiment 1 except that the phosphate of the thermal shock resistant coating consists of dihydrogen phosphate, hydrogen phosphate and orthophosphate in a weight ratio of 1:1:1.

Example 19

A heat-insulating felt having thermal shock resistance is the same as Embodiment 1 except that the phosphate of the thermal shock resistant coating consists of dihydrogen phosphate, hydrogen phosphate, orthophosphate and metaphosphate in a weight ratio of 1:1:1:1.

The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 16 to 19 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts obtained in Working Examples 16 to 19 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25°C being only 0.031 to 0.035 W/(K m) and their breaking time at 1000°C and at an air pressure of 5 bar is 85 to 95 minutes. This shows that the phosphates of the above components can ensure the strength and compactness of the coating, thereby imparting excellent thermal shock resistance to the thermal shock resistant coating.

Further, it can be seen from the above table that the thermal insulation felt manufactured in working example 19 has superior thermal insulation performance and thermal shock performance, with its thermal conductivity at 25°C being as low as 0.031W/(K m) and its rupture time at 1000°C and at atmospheric pressure of 5 Bar is up to 91 minutes. Thus, embodiment 19 is the best embodiment. When the phosphate of the thermal shock resistant coating consists of dihydrogen phosphate, hydrogen phosphate, orthophosphate and metaphosphate in a weight ratio of 1:1:1:1, the performance of the thermal shock resistant coating is best.

In summary, the combining use of different kinds of phosphates is to some extent beneficial for the synergy of the combining use between different phosphate molecules. The three-dimensional crosslinked structure formed by such combined use can not only greatly improve cohesion and effectively contribute to coagulation and hardening, thereby ensuring the strength and compactness of the coating and imparting excellent thermal shock resistance to the thermal shock resistant coating.

Example 20

A thermal insulation felt having thermal shock resistance is the same as in Working Example 1 except that the thickness of the obtained glass fiber cloth is 1.0 mm and the weaving density of warp or weft is 15 pieces/cm.

Example 21

A thermal insulation felt having thermal shock resistance is the same as in Working Example 1 except that the thickness of the obtained glass fiber cloth is 3.0mm and the weaving density of warp or weft is 15 pieces/cm.

Example 22

A thermal insulation felt having thermal shock resistance is the same as in Working Example 1 except that the thickness of the obtained glass fiber cloth is 2.0mm and the weaving density of the warp or weft is 25 pieces/cm.

Example 23

A heat-insulating felt having thermal shock resistance is the same as in Working Example 1 except that the thickness of the glass fiber fabric obtained is 2.0 mm and the weaving density of warp or weft is 30 pieces/cm.

Example 24

In the thermal shock resistant thermal insulation felt, the glass fiber layer is a glass fiber felt made by needle punching. In needle punching, the glass fiber is cut into individual fiber filaments, with the fiber filaments being gathered to obtain a glass fiber mesh, after which a needle punching machine is used to pierce the glass fiber mesh up and down, so that the fibers are intertwined and reinforced, resulting in the glass fiber felt can be obtained. The heat-insulating felt having thermal shock resistance is the same as in Working Example 1 except that the thickness of the glass fiber fabric obtained is 2.0 mm and the weaving density of warp or weft is 15 pieces/cm.

Aus der obigen Tabelle ist ersichtlich, dass die in den Ausführungsbeispielen 20 bis 24 erhaltenen Wärmedämmfilze eine bessere Wärmeisolationsleistung und Thermoschockbeständigkeit aufweisen, wobei ihre Wärmeleitfähigkeit bei 25 °C nur 0,027 bis 0,043 W /(K·m) beträgt und ihre Bruchzeit bei 1000 °C und bei Luftdruck von 5 Bar 73 bis 92 Minuten beträgt.The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 20 to 24 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts obtained in Working Examples 20 to 24 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25 °C is only 0.027 to 0.043 W/(K m) and its rupture time at 1000 °C and at air pressure of 5 bar is 73 to 92 minutes.

This shows that the glass fiber sheet having the above thickness and weaving density has better performance effects; and when the weaving density is fixed, the higher the thickness, the better the thermal insulation performance.

Further, it can be seen from the above table that the thermal insulation felt manufactured in working example 21 has better thermal insulation performance and thermal shock performance, with its thermal conductivity at 25°C being as low as 0.029W/(K m) and its rupture time at 1000°C and at atmospheric pressure of 5 bar is up to 92 minutes. Thus, embodiment 21 is the best embodiment. When the thickness of the fiberglass fabric is 3.0mm and the weaving density of the warp or weft is 15pcs/cm, the thermal insulation performance of the thermal insulation felt is best.

It can also be seen from the above table that when the glass fiber layer is a glass fiber felt, its thermal insulation performance is somewhat improved and its thermal shock resistance is slightly reduced. Reference is made to embodiment 24, in which the thermal conductivity at 25°C is only 0.027 W/(K·m) and the rupture time at 1000°C and air pressure of 5 bar is 83 minutes. Thus, embodiment 24 is the best embodiment. When the glass fiber layer is a glass fiber felt, the thermal insulation performance of the thermal insulation felt is better. The reason for this could be that the distribution of voids between the fibers of the glass fiber felt is more disordered than that of the glass fiber fabric, resulting in a further improvement in the thermal insulation performance; that the corresponding structure is lighter and looser, resulting in a slight decrease in tensile strength and thermal shock resistance.

In summary, as the glass fiber layer, the above-mentioned glass fiber cloth and glass fiber felt have better performances. The higher the thickness, the better the thermal insulation performance. If the weave density is too low, glass microbeads have fewer binding sites. If the weaving density is too large, the injection of glass microbeads will be affected, resulting in deterioration of the thermal insulation performance and temperature resistance of the thermal insulation felt.

Example 25

A thermal shock resistant felt is the same as embodiment 1 except that the glass fiber is Z-Tex plus™.

Example 26

A thermal insulation felt with thermal shock resistance is the same as in embodiment 1 except that the glass fiber is Z-Tex super™.

Example 27

A thermal shock resistant thermal insulation felt is the same as embodiment 1 except that the glass fiber is Z-Tex ultra™.

Example 28

A thermal insulation felt with thermal shock resistance is the same as in working example 1 except that the glass fiber uses Z-Tex plus™ and Z-Tex ultra™ in a weight ratio of 1:1.

Example 29

A thermal insulation felt with thermal shock resistance is the same as in Embodiment 1 except that the glass fiber is a commercially available glass fiber with a length of 25 mm, a diameter of 10 µm and a grade of CR21-2400 purchased from Wuhu Baiyun Glass Fiber Co.,Ltd. is.

The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 25 to 29 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts obtained in Working Examples 25 to 28 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25°C being only 0.029 to 0.035 W/(K m) and their breaking time at 1000°C and at an air pressure of 5 bar is 85 to 93 minutes. This shows that the above-mentioned glass fibers have better performances in use, and the glass fiber sheets made with them can effectively ensure the thermal insulation performance and the thermal shock resistance of the thermal insulation felt.

At this time, the temperature resistance and the heat insulating performance of the glass fibers in Working Examples 25 to 28 sequentially increase. This makes Z-Tex ultra™ the preferred glass fiber. When assembling multiple groups of glass fibers, it is advantageous to increase the number and disorder of voids so that there are more bonding sites for glass microbeads under the same weave density, which is conducive to filling glass microbeads. This ensures the thermal insulation performance and thermal shock resistance of the thermal insulation felt.

Further, it can be seen from the above table that, compared to Embodiment 1, the thermal conductivity of the thermal insulation felt of Comparative Example 29 at 25°C has a thermal conductivity of up to 0.13W/(K·m), which is 271% higher than that of Embodiment 1 where the rupture time at 1000°C and at air pressure of 5 bar is only 67 minutes, which is 21% shorter than that of Embodiment 1. From this it can be seen that the glass fibers used in the present application can effectively guarantee the performance of the final product.

In summary, the choice of optical fiber is closely related to the final performance of the product. The glass fiber layer woven from the above types of glass fiber has a compact and stable structure after filling with glass microbeads, not easily deformed due to heat and other reasons, and can provide more bonding sites for the thermal shock resistant coating, so that the bonding of the thermal shock resistant coating is more stable and becomes more compact.

Example 30

A thermal insulation felt with thermal shock resistance is the same as in Working Example 1, except that the composition and content of raw materials of the hollow glass microbeads in weight percent are as follows: 60% of SiO ₂ , 10% of Al ₂ O ₃ , 30% of ZrO ₂ .

Example 31

A thermal insulation felt with thermal shock resistance is the same as in Example 1, except that the composition and content of raw materials of the hollow glass microbeads in weight percent are as follows: 60% of SiO ₂ , 30% of Al ₂ O ₃ , 10% of ZrO ₂ .

Example 32

A thermal insulation felt with thermal shock resistance is the same as in Embodiment 1, except that the composition and content of raw materials of the hollow glass microbeads in weight percent are as follows: 40% of SiO ₂ , 50% of Al ₂ O ₃ , 10% of ZrO ₂ .

Example 33

A thermal insulation felt having thermal shock resistance is the same as in Embodiment 1 except that the filler is SiO ₂ airgel having a particle size of 0.5 mm

The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 30 to 33 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts obtained in Working Examples 30 to 33 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25°C being only 0.029 to 0.035 W/(K m) and their breaking time at 1000°C and at an air pressure of 5 bar is 85 to 89 minutes. This shows that the above composition of the hollow glass microbeads has a better filling effect with the glass fiber layer, while the hollow glass microbeads, due to their own high temperature resistance, impart excellent high temperature resistance and thermal insulation performance to the glass fiber layer.

It can also be seen from the above table that when the filler is SiO2 airgel, it still has better thermal insulation performance and thermal shock resistance, but these are reduced to different degrees compared with the case of using hollow glass microbeads. Reference is made to example 32, in which the thermal conductivity at 25°C is only 0.039 W/(K·m) and the rupture time at 1000°C and air pressure of 5 bar is 80 minutes. Thus, the hollow glass microbead is the best filler. The reason could be that the glass microbeads of the above components have a more compact structure, higher hardness and lower thermal conductivity, and thus after bonding with the glass fiber layer system, effectively exert the heat insulation performance and thermal shock resistance of the glass fiber layer system. Although the SiO2 airgel can also bring better thermal insulation performance, the SiO2 airgel, limited by the structural properties of the airgel filler itself, is not conducive to thermal shock resistance and mechanical properties of thermal insulation felt

Example 34

A thermal insulation felt having thermal shock resistance is the same as in Embodiment 1 except that the hollow glass microbeads have a particle size of 50 µm and are filled at a weight ratio of 1:3.

Working example 35

A thermal insulation felt having thermal shock resistance is the same as in Embodiment 1 except that the hollow glass microbeads have a particle size of 50 µm and are filled in a weight ratio of 1:7.

Example 36

A thermal insulation felt having thermal shock resistance is the same as in Embodiment 1 except that the hollow glass microbeads have a particle size of 10 µm and are filled at a weight ratio of 1:5.

Example 37

A thermal insulation felt having thermal shock resistance is the same as in Embodiment 1 except that the hollow glass microbeads have a particle size of 100 µm and are filled at a weight ratio of 1:5.

The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 34 to 37 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts obtained in Working Examples 34 to 37 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25°C being only 0.029 to 0.041 W/(K m) and their breaking time at 1000°C and at an air pressure of 5 bar is 83 to 89 minutes. This shows that the above glass microbeads having the above filling ratio and having the above particle size can effectively improve the thermal insulation performance and the thermal shock performance of the thermal insulation felt. And in the case of a certain particle size, the higher the filling ratio, the better the thermal insulation performance. But based on actual use requirements and production costs, the filling ratio is preferably 1:(3 to 7). In other exemplary embodiments, a higher filling ratio can also be selected, which is not to be regarded as a limitation of the present application.

It can also be seen from the above table that, with reference to Embodiment 1 and Embodiments 36 and 37, in the case that the particle size of glass microbeads is changed, the thermal insulation performance and thermal shock resistance are changed accordingly, with the thermal conductivity at 25°C being only 0.029 to 0.041 W/(K m) and the rupture time at 1000 °C and at air pressure of 5 bar is 83 to 89 minutes. Therefore, other things being equal, the smaller the particle size of the vacuum glass microbeads, the better the performance of the vacuum glass microbeads. This could be because the bulk density and strength are higher when the particle size is smaller.

In summary, the hollow glass microbeads with the above particle size and weight fraction not only continue to ensure the filling density and strength of the glass fiber layer filled with the hollow glass microbeads, but also cannot easily affect the uniformity and bonding strength of the coating, thereby increasing the high temperature resistance and the thermal insulation performance of the glass fiber layer can be ensured.

Example 38

A thermal insulation felt having thermal shock resistance is the same as in Working Example 1 except that the coupling agent is KH-570.

Example 39

A thermal insulation felt having thermal shock resistance is the same as Working Example 1 except that the coupling agent is KH-602.

Example 40

A thermal insulation felt having thermal shock resistance is the same as in Working Example 1 except that the coupling agent is KH-792.

Example 41

A thermal insulation felt having thermal shock resistance is the same as Embodiment 1 except that the coupling agent is Sj-42.

Example 42

A thermal insulation felt having thermal shock resistance is the same as in Working Example 1 except that the coupling agent consists of KH-602 and KH-792 in a weight ratio of 1:1.

Example 43

A thermal insulation felt having thermal shock resistance is the same as in Working Example 1 except that the coupling agent consists of KH-550 and KH-570 in a weight ratio of 1:1.

The thermal insulation performance and thermal shock resistance of the thermal insulation felts obtained in the above Working Examples 38 to 43 were tested. The average test results are shown in the following table:

From the above table, it can be seen that the thermal insulation felts obtained in Working Examples 38 to 43 have better thermal insulation performance and thermal shock resistance, with their thermal conductivity at 25°C being only 0.032 to 0.036 W/(K m) and their breaking time at 1000°C and at an air pressure of 5 bar is 84 to 87 minutes. This shows that the adhesives of the above components can effectively improve the thermal insulation performance and the thermal shock resistance of the thermal insulation felt, and in the case where multi-components of the adhesive are used in combination at the same time, the improvement in performance becomes more remarkable.

Further, it can be seen from the above table that the thermal insulation felt manufactured in working example 43 has better thermal insulation performance and thermal shock performance, with its thermal conductivity at 25°C being as low as 0.032W/(K m) and its breaking time at 1000°C and at atmospheric pressure of 5 bar is up to 87 minutes. Thus, embodiment 43 is the best embodiment. When the adhesion promoter consists of KH-550 and KH-570 in a weight ratio of 1:1, the thermal insulation performance of the thermal insulation felt is best.

In summary, the silane coupling agent of the above components is effective in improving the bond strength between the thermal shock resistant coating and the glass fiber layer. Then the thermal shock resistant coating can be bonded on both sides of the glass fiber layer and exert a protective and heat insulating effect on the glass fiber layer. When a plurality of silane coupling agents are used in combination, a cross-linkage of the three-dimensional structure, which has a stronger structure and is more sticky, can be formed. The present specific embodiment is provided for explanation of the present application only and does not constitute a limitation of the present application. After reading the present description, those skilled in the art can make modifications to the present embodiment as needed without using the inventive contribution. As long as these modifications are within the scope of the claims of the present application, they are protected by patents.

Claims (11)

A thermal shock resistant thermal insulation felt, characterized in that the thermal shock resistant thermal insulation felt has a layered structure and consists of a filled glass fiber layer and a thermal shock resistant coating, wherein the thermal shock resistant coating is coated on one side or both sides of the filled glass fiber layer; wherein the filler is hollow glass microbeads or SiO ₂ airgel; the thermal shock resistant coating being obtained by drying and curing a thermal shock resistant paint applied on one side or both sides of the filled glass fiber layer; wherein the composition and content of raw materials of the thermal shock resistant paint in weight percent are as follows: 10 to 50% of SiO ₂ , 5 to 60% of ZnO, 5 to 40% of Al ₂ O ₃ , 5 to 15% of polytetrafluoroethylene, 5 to 35% of silane coupling agent, 15 to 50% of phosphate. Thermal insulation felt with thermal shock resistance claim 1 , characterized in that the thickness applied is in the range 0.02 to 1.5 mm, the drying and curing comprising curing at a controlled temperature of 250 to 500°C for 1 to 5 hours. Thermal insulation felt with thermal shock resistance claim 1 characterized in that the phosphate in the thermal shock resistant paint is one or more of dihydrogen phosphate, hydrogen phosphate, orthophosphate and metaphosphate. Thermal insulation felt with thermal shock resistance claim 1 , characterized in that the glass fiber layer is a glass fiber fabric or glass fiber felt, wherein the glass fiber fabric or glass fiber felt is made of glass fibers; wherein the glass fiber layer has a thickness of 1.0 to 3.0 mm and a weaving density of warp and weft of 15 to 30 pieces/cm. Thermal insulation felt with thermal shock resistance claim 4 , characterized in that the glass fiber is a continuous glass fiber with a diameter of 6 to 24 µm, the glass fiber being one or more fibers selected from "Z-Tex Series" comprising: Z-Tex™, Z-Tex plus™, Z-Tex super™, Z-Tex ultra™ is. Thermal insulation felt with thermal shock resistance claim 1 , characterized in that the composition and content of raw materials of the hollow glass microbeads in weight percent are as follows: 50 to 80% of SiO ₂ , 10 to 70% of Al ₂ O ₃ , 10 to 30% of ZrO ₂ . Thermal insulation felt with thermal shock resistance claim 6 , characterized in that the particle size of the hollow glass microbeads is less than or equal to 100 µm, the weight ratio of the hollow glass microbeads used to the glass fiber fabric or glass fiber felt used being 1: (3 to 7). Thermal insulation felt with thermal shock resistance claim 1 characterized in that the silane coupling agent is one or more of KH-550, KH-570, KH602, KH792, Sj-42. Manufacturing process for a thermal insulation felt with thermal shock resistance according to one of Claims 1 until 8th , characterized in that it comprises the following steps: S1: producing a glass fiber layer; S2: Making a filled glass fiber layer: injecting a filler into the glass fiber layer to obtain the filled glass fiber layer; S3: Making a thermal shock resistant coating: Applying a thermal shock resistant paint on both sides of the glass fiber layer with filler using roll coating, calendering and knife coating process, controlling the applied layer thickness to 0.02~1.0mm, after which the applied thermal shock resistant paint curing at a controlled temperature of 250 to 500°C for 1 to 5 hours to obtain a thermal insulation felt with thermal shock resistance. Manufacturing process for a thermal insulation felt with thermal shock resistance claim 9 , characterized in that the glass fiber layer is a glass fiber fabric made by a weaving process or a glass fiber felt made by any of needle punching, wet process and dry process. Thermal shock resistant paint, characterized in that the composition and content of raw materials of the thermal shock resistant paint in weight percent are as follows: 10 to 50% of SiO ₂ , 5 to 60% of ZnO, 5 to 40% of Al ₂ O ₃ , 5 bis 15% of PTFE, 5 to 35% of silane coupling agent, 15 to 50% of phosphate.