JP2024502911A - Heat-retaining felt with thermal shock resistance and method for manufacturing the same - Google Patents

Abstract

The present application relates to a thermal insulation felt having thermal shock resistance and a method for manufacturing the same. The thermal insulation felt has a layered structure and consists of a filled glass fiber layer and a thermal shock resistant coating layer, the thermal shock resistant coating layer being applied on one or both sides of the filled glass fiber layer, The filler is hollow glass beads or airgel SiO2, and the thermal shock resistant coating layer is obtained by applying a thermal shock resistant coating material on one or both sides of the glass fiber layer with the filler, and then drying and curing. The raw material composition and content of the thermal shock resistant coating material are, in weight percent, 10 to 50% SiO2, 5 to 60% ZnO, 5 to 40% Al2O3, and 5 to 15% polytetrafluorocarbon. Ethylene, 5-35% silane coupling agent, 15-50% phosphate. The thermal felt felt, ie, the glass fiber layer, produced in the present invention has better thermal shock resistance performance after filling with filler and applying a thermal shock resistant coating layer. [Selection diagram] None

Description

TECHNICAL FIELD The present application relates to the field of insulation material technology, and more specifically, to a insulation felt having thermal shock resistance and a method for manufacturing the same.

An electric vehicle (BEV) is powered by an on-board power source, drives wheels with a motor, and is formed by integrating cutting-edge technologies related to vehicle power control and drive. It refers to a car with technology, new structure, and due to its environmentally friendly characteristics, it is also considered as a development trend of the future car industry.The most important component of this type of car is the storage battery, so The material covers the outside of the battery to provide thermal protection for the battery or insulation between lithium battery cells.

Related art discloses a thermal felt that is a glass fiber felt composite material, the glass fiber felt composite material includes an airgel felt and a polyethylene layer, the polyethylene layer is provided between two layers of airgel felt, and the above-mentioned The composite thermal insulation felt has excellent thermal insulation performance and can achieve the purpose of thermal protection for batteries. However, the thermal shock resistance of the above-mentioned composite thermal insulation felt is weak, and after the thermal insulation felt experiences severe temperature changes or alternately experiences low and high temperatures within a certain initial temperature range, its airgel felt and polyethylene The structure of both layers is easily destroyed, and the thermal protection effect is greatly reduced, so the thermal felt needs to be regularly inspected or replaced, which brings great inconvenience to the user.

In summary, existing thermal felts have very good thermal protection functions, but have poor thermal shock resistance.

In order to solve the above technical problems, the present application provides a thermal shock-resistant felt and a method for producing the same, which ensures that the thermal felt has thermal protection performance and very good thermal shock-resistant performance. do.

In a first aspect, the present application provides a thermal insulation felt with thermal shock resistance performance, and adopts the following technical solution.

The thermal shock resistant felt has a layered structure and is composed of a glass fiber layer with a filler and a thermal shock resistant coating layer, and the thermal shock resistant coating layer is a thermal shock resistant felt. , applied to one or both sides of the filled glass fiber layer;
The filler is hollow glass beads or airgel _SiO2 ,
The thermal shock resistant coating layer is obtained by applying a thermal shock resistant coating material on one or both sides of a glass fiber layer with a filler, and then drying and curing it,
The raw material composition and content of the thermal shock resistant coating material are, in weight percent, 10 to 50% SiO ₂ , 5 to 60% ZnO, 5 to 40% Al ₂ O ₃ , and 5 to 15% polytetrafluorocarbon. Ethylene (hereinafter abbreviated as PTFE), 5-35% silane coupling agent, and 15-50% phosphate.

By adopting the above-mentioned technical proposal, the heat-retaining felt with the glass fiber layer as the base layer retains heat by the filler filled inside the glass fiber layer and the thermal shock-resistant coating layer applied to both sides of the glass fiber. In addition to providing protection, the insulation felt has excellent thermal shock resistance.

The use of filler material not only strengthens the mechanical performance of the glass fiber layer through filling, but also strengthens the high temperature resistance performance of the entire glass fiber layer due to the high temperature resistance of the material itself, which in turn prevents the thermal insulation felt from experiencing severe temperature changes. It is difficult to deform even when exposed to heat, has high structural stability, and guarantees the high temperature resistance and heat insulation performance of the insulation felt.

The thermal shock-resistant coating layer protects and reinforces the glass fiber layer from the outside, thereby reducing the effects of temperature on the glass fiber layer and making the internal structure of the glass fiber layer less likely to be destroyed by severe temperature changes. Compared to thermal felt without a thermal shock-resistant coating layer, the thermal conductivity is reduced by 35-85% at 25°C, and the time to failure at 1000°C and 5 Bar air pressure is extended by 77-210%. However, it can be seen from this that by applying the thermal shock resistant coating layer, the heat retaining performance and thermal shock resistant performance of the thermal insulation felt are significantly improved.

Preferably, the coating thickness is controlled to be 0.02 to 1.5 mm, and the drying and curing is performed at a temperature of 250 to 500° C. for 1 to 5 hours.

By adopting the above technical scheme, the thermal shock resistant coating layer cured at the above temperature and heating time has a good composite effect with the glass fiber layer, and the reason is that the thermal shock resistant coating layer is cured under the above process conditions. It is speculated that it may be able to penetrate into the fiber layer and thus effectively reduce the effect of temperature on the glass fiber layer after curing is completed.
If the temperature and heating time exceed the above process conditions, the heat insulation effect will be lost, and the reason is that most of the thermal shock-resistant coating layer will penetrate into the glass fiber layer, which will reduce the heat resistance of the surface of the glass fiber layer. It is speculated that the impact coating layer cannot effectively block the influence of temperature on the glass fiber layer, and under the above temperature conditions, the glass fiber may be slightly softened and the internal structure changed. .

It should also be noted that generally speaking, the higher the thickness of the coating layer, the better its performance, but based on the actual usage requirements and production costs, the preferred coating thickness is 0.02 ~ 1.5 mm, higher thicknesses may be selected in applications and should not be considered as limiting to the present application.

Preferably, the phosphate in the thermal shock-resistant coating material is one or more of dihydrogen phosphate, hydrogen phosphate, orthophosphate, and metaphosphate.

By adopting the above technical proposal, the phosphate of the above component is a fire-resistant material whose main compound is acidic orthophosphate or condensed phosphate and has gelation performance, and after heating, the phosphate component can react and combine with alkali metals or amphoteric oxides and their hydroxides, play a setting hardening role, thereby imparting excellent thermal shock resistance performance to the thermal shock resistant coating layer,
When multiple phosphates are combined and used, the three-dimensional cross-linked structure formed by them crosses and connects to each other, which significantly improves the adhesive strength and can effectively play a role in setting and hardening. Therefore, the thermal shock resistant performance of the thermal shock resistant coating layer is guaranteed.

Preferably, the glass fiber layer is a glass fiber cloth or glass fiber felt made from glass fibers, the thickness of the glass fiber layer is 1.0 to 3.0 mm, and the weaving density of the warp or weft is The number is 15 to 30 lines/cm.

By adopting the above technical scheme, the above glass fiber cloth and glass fiber felt, when used as a glass fiber layer, both have excellent usage effects, and the thicker the thickness, the better its heat retention performance. If the weave density is too loose, there will be few bonding sites for glass beads, and if the weave density is too dense, it will affect the injection of glass beads, which will eventually reduce the heat retention and heat resistance performance of the insulation felt. Compared to glass fiber cloth, fiber felt has a more disordered distribution of gaps between fibers, so it has an advantage in heat retention performance and is lighter, but has lower tensile strength.

Preferably, the glass fibers are continuous glass fibers with a diameter of 6 to 24 μm, and the glass fibers are of the Z-Tex Series: Z-Tex ^™ , Z-Tex plus ^™ , Z-Tex super ^™ , Z-Tex One or more types selected from ultra ^TM .

By adopting the above technical proposal, the glass fiber layer formed by spinning the glass fibers of the above model becomes dense and strong after being filled with glass beads, and does not deform due to heat etc. It can provide more bonding sites to the thermal shock resistant coating layer, making the bonding of the thermal shock resistant coating layer stronger and denser, and in time, the performance will be improved when using Z-Tex ultra. Best of all, the glass fiber has high tensile strength, high temperature withstand, and is more resistant to thermal shock.

Preferably, the raw material composition and content of the hollow glass beads are 50-80% SiO ₂ , 10-70% Al ₂ O ₃ , and 10-30% ZrO ₂ in weight percent.

By adopting the above technology, the above fillers not only have excellent filling bond with the glass fiber layer, but also provide excellent high temperature resistance and heat insulation performance to the glass fiber layer due to their own high temperature resistance. It can also be done.

Preferably, the particle size of the hollow glass beads is ≦100 μm, and the amount of the hollow glass beads used is such that the weight ratio of hollow glass beads to glass fiber cloth or glass fiber felt is 1:(3 to 7). .

By adopting the above technical solution, the hollow glass beads with the above specific gravity can not only further ensure the density and strength of the glass fiber layer filled with hollow glass beads, but also have no effect on the uniformity and bonding strength of the coating layer. This ensures the high temperature resistance and heat insulation performance of the glass fiber layer.

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

By adopting the above technical proposal, the silane coupling agent of the above components can effectively improve the connection strength between the thermal shock resistant coating layer and the glass fiber layer, and as a result, the thermal shock resistant coating layer It is strongly bonded to both sides of the fiber layer and can play the role of protection and insulation for the glass fiber layer, and when multiple sets are combined, a three-dimensional spatial structure cross-connection can be formed, making the structure stronger. Better adhesion.

In a second aspect, the present application provides a method for manufacturing a thermal felt with thermal shock resistance performance, and adopts the following technical scheme.

A method for producing a heat-retaining felt having thermal shock resistance, the method comprising:
S1, a step of adjusting the glass fiber layer;
1) When the glass fiber layer is a glass fiber cloth, the glass fiber cloth is manufactured by a spinning method,
2) when the glass fiber layer is glass fiber felt, manufacturing the glass fiber felt using any one of needling, wet method, and dry method;
S2, manufacturing a glass fiber layer with a filler to obtain a glass fiber layer with a filler by injecting a filler into the glass fiber layer;
S3. First, use one of roller coating, rolling, and blade coating to apply thermal shock-resistant coating material on both sides of the glass fiber layer with filler, and the coating thickness is 0.02~1. 0 mm, and then curing for 1 to 5 hours at a temperature of 250 to 500° C. to obtain a thermal shock resistant felt.

By adopting the above technical scheme, the thermal insulation felt produced by the above process has stable and uniform performance, all have excellent thermal insulation performance, meet the downstream application requirements, and can be used throughout the process. Easy to manufacture and suitable for large scale industrial production.

In a third aspect, the present application provides a thermal shock resistant coating material, which adopts the following technical scheme.

A thermal shock-resistant coating material, the raw material composition and content of which is, in weight percent, 10-50% SiO ₂ , 5-60% ZnO, 5-40% Al ₂ O ₃ , 5-15% PTFE , 5-35% silane coupling agent, 15-50% phosphate.

By adopting the above technical proposal, the thermal shock resistant coating material of the above components is dried and hardened on the outside of the glass fiber layer to form a thermal shock resistant coating layer that protects the glass fiber layer, thereby forming a heat insulation felt. In addition to imparting thermal shock resistance, the influence of temperature on the glass fiber layer is reduced, and the internal structure of the glass fiber layer is less likely to be destroyed by severe temperature changes.

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

1. The present application provides that the thermal insulation felt has excellent mechanical performance and heat resistance performance by filling the filler and applying it in accordance with the thermal shock resistant coating layer, and that the internal structure of the thermal insulation felt is maintained after experiencing severe temperature changes or high temperatures. Damage due to deformation is less likely to occur.

2. The manufacturing method of the present application is simple and applicable to industrialized large-scale production, and the manufactured products have both good heat retention performance and mechanical performance, which can meet the practical requirements of downstream applications.

3. The thermal shock resistant coating material of the present invention has excellent thermal shock resistance and can effectively ensure heat retention performance and thermal shock resistance after being dried and cured on the surface of the glass fiber layer.

4. The final thermal insulation felt of the present application can be applied to the field of thermal insulation materials such as thermal insulation protection of storage batteries of new energy vehicles, thermal insulation protection of national defense aviation materials, storage of medical and sanitary products, and building thermal insulation materials, and has excellent properties in all of them. Demonstrates heat retention and insulation performance.

Hereinafter, the present application will be described in more detail with reference to Examples.

The raw materials used in each example of this application are commercially available unless otherwise specified below.
SiO ₂ , ZnO, and Al ₂ O ₃ had particle sizes of 2 to 10 μm, and were all purchased from Sinopharm Chemical Reagent Co., Ltd.
PTFE had a polymerization degree of 60 to 200* ¹⁰⁴ and was purchased from Sinopharm Chemical Reagent Co.
Hollow glass beads had a particle size ≦100 μm and were purchased from Minnesota Mining and Machinery Manufacturing Company;
Z-Tex Series: Z-Tex ^TM , Z-Tex plus ^TM , Z-Tex super ^TM , and Z-Tex ultra ^TM are all manufactured by Shanghai Guobo Automotive Science Co., Ltd. and Technology Co., Ltd. ) and its performance is as follows.

Performance Detection Test The thermal insulation felts manufactured in the Examples and Comparative Examples were selected as detection objects, and the thermal insulation performance and thermal shock resistance performance of each set were tested respectively, and the detection steps were as follows.

1) Heat insulation performance test The heat insulation felt of the detection target group was processed into 5 samples of 50 mm * 50 mm * 2.5 mm, and measured using a thermal conductivity meter (model Hot Disk TPS 2500S, purchased from the Swedish Hot Disk company). test and
Detection step: First take 5 samples, stack them, put them in the sample holder, clamp them, then click "Confirm" and "Disclose detection" on the device operation screen to start the test and detect The average value is taken as the result.

2) Thermal shock resistance test The heat insulating felt of the detection target set was processed into 5 samples of 50 mm * 50 mm * 2.5 mm, and the thermal shock resistance was tested using a pneumatic flame spray gun to determine the flame temperature. Adjust the temperature to 1000°C and the air pressure to 5 Bar, perform the test on the side of the sample coated with the thermal shock resistant coating layer, and record the time when the sample expires, i.e. the time when a hole appears in the sample. , take the average value.

Example Example 1
A thermal insulation felt having thermal shock resistance, comprising a glass fiber layer with a filler and a thermal shock resistant coating layer applied on both sides of the glass fiber layer with a filler,
The filler is a hollow glass bead with a particle size of 50 μm, and the raw material composition and content in weight percent are 80% SiO ₂ , 10% Al ₂ O ₃ , 10% ZrO ₂ ,
The thermal shock resistant coating layer is obtained by applying a thermal shock resistant coating material on both sides of the filled glass fiber layer and then drying and curing it.
The raw material composition and content of the thermal shock-resistant coating material are, in weight percent, 25% SiO ₂ , 30% ZnO, 5% Al ₂ O ₃ , 5% PTFE, 15% silane coupling agent, 20% is a phosphate of
Here, the silane coupling agent is KH-550, and the phosphate is dihydrogen phosphate.

Specifically, the method for manufacturing a heat-retaining felt having thermal shock resistance described above includes steps S1 to S3.

S1, Adjustment of glass fiber layer The glass fiber layer is a glass fiber cloth manufactured by a spinning method, and the glass fiber cloth is manufactured by glass fibers being manufactured through initial twisting, batch warping, drawing, and spinning on a loom. It's something you get,
The glass fibers used here are Z-Tex ^TM , with a length of 25 mm and a diameter of 10 μm, the thickness of the obtained glass fiber cloth is 2.0 mm, and the weave density of the warp or weft is 15 book/cm.

S2, Production of glass fiber layer with filler Firstly, the glass fiber layer was placed in a closed circular mold with pipes, the air pressure was controlled at 10 Bar, and the weight ratio of 1:5 was determined through 8 sets of evenly installed pipes. The filler is filled into the gaps between the glass fiber layers at a ratio of 1 to 3 to obtain a glass fiber layer with the filler, that is, a glass fiber layer with the filler.

S3. Production of thermal shock-resistant coating layer A thermal shock-resistant coating material is applied on both sides of the filled glass fiber layer by any one of roller coating, rolling, and blade coating. In this example, roller coating is used. Taking as an example, the specific steps are as follows.
Each raw material of the thermal shock resistant coating material is mixed uniformly to obtain the thermal shock resistant coating material, placed on the slurry disk of the roller coating equipment, then the equipment is started, and on both sides of the glass fiber layer with filler, The same coating thickness of 0.3 mm was applied, and after the coating was completed, the temperature was controlled at 250°C and cured for 1 h to obtain a thermal felt with thermal shock resistance performance, and the thermal shock resistance coating layer was determined by measurement. The actual thickness of is 0.15 mm.

Examples 2-8
The thermal shock-resistant felt is different from Example 1 in that each component and corresponding weight of the thermal shock-resistant coating material are different, and the components and corresponding weight per 100 kg are as shown in Table 1. All other aspects are the same as in Example 1.

Comparative example 1
The insulation felt is the same as Example 1 except that it does not include a thermal shock resistant coating layer applied on both sides of the filled glass fiber layer.

Comparative example 2
The heat-insulating felt is the same as Example 1 except that an equal amount of B ₂ O ₃ is used instead of ZnO in the thermal shock-resistant coating material.

Comparative example 3
The heat-insulating felt is the same as Example 1 except that an equal amount of B ₂ O ₃ is used instead of Al ₂ O ₃ in the thermal shock-resistant coating material.

Comparative example 4
The thermal shock resistant coating material for producing the thermal shock resistant coating layer is a thermal insulation felt, and the thermal shock resistant coating material is 5% SiO ₂ , 10% ZnO, 10% Al ₂ O ₃ , 20% PTFE, 45% silane coupling. All other components were the same as in Example 1 except for the composition of agent and 10% phosphate.

Comparative example 5
The thermal shock resistant coating material for producing the thermal shock resistant coating layer comprises 5% SiO ₂ , 20% Al ₂ O ₃ , 20% PTFE, 45% silane coupling agent and 10% thermal shock resistant felt. Other than the phosphate, everything else is the same as in Example 1.

The heat retention performance and thermal shock resistance of the heat insulation felts obtained in Examples 1 to 8 and Comparative Examples 1 to 5 were detected, and the measurement results are shown in the table below.

From the table, it can be seen that the thermal shock-resistant felts obtained in Examples 1 to 8 all have excellent heat-retaining performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.03 to 0. It was found that with only 13 W/(K m), the time until failure at 1000°C and 5 Bar air pressure reaches 53 to 93 min. It was shown that the presence of the impact layer ensures the heat retention performance of the insulation felt and can effectively improve the thermal shock resistance performance of the insulation felt.The reason for this was analyzed and found that A thermal shock-resistant coating material is applied to both sides of the glass fiber layer to form both inner and outer layers with a dense structure and high strength, which can effectively protect and reinforce the glass fiber layer. This may be due to the fact that the structure of the glass fiber layer is not easily affected by temperature.

In particular, the thermal shock resistant felt produced in Example 4 has excellent heat retention and thermal shock resistance, and has a thermal conductivity of only 0.03 W/(K m) at 25°C. The time to failure at 5 Bar air pressure reaches 93 min.

Furthermore, from the above table, compared to Example 1, Comparative Example 1 has a thermal conductivity of 0.20 W/(K - m), which increased by 566% compared to Example 1, and the time until failure at 1000° C. and 5 Bar air pressure was only 30 min, which was 68% shorter than Example 1.

From now on, when providing sealing and strength support in the situation where both the inner and outer thermal shock-resistant layers are missing, the thermal felt still has a certain thermal insulation performance and thermal shock-resistant performance, but the effects of thermal insulation and thermal shock resistance are both It can be seen that this is inferior to the heat-retaining felt having thermal shock resistance performance of the present application.

Furthermore, from the above table, compared to Example 1 in Comparative Examples 2 and 3, the thermal conductivity of the obtained thermal felts at 25°C reached 0.16 to 0.21 W/(K m), It can be seen that the increase is 357 to 500% compared to Example 1, and the time until failure at 1000° C. and 5 Bar air pressure is only 32 to 35 minutes, which is a 62 to 66% reduction compared to Example 1. Furthermore, from the above table, Comparative Examples 4 and 5 have thermal conductivities of 0.18 to 0.25 W/(K m) at 25°C compared to Example 1, and 414 W/(K m) compared to Example 1. -614% increase, and the time to failure at 1000° C. and 5 Bar air pressure was only 30-33 min, a 65-68% reduction compared to Example 1.

This means that only when a thermal shock resistant coating material with a specific composition and content is applied to both sides of the glass fiber layer with filler material can a dense and strong thermal shock resistant layer be formed on both the inner and outer layers. , differences in components or differences in content all affect the dense structure and impact strength of the thermal shock-resistant layer, and as a result, the thermal insulation performance and thermal shock-resistant performance of the thermal insulation felt are significantly reduced.

In summary, the glass fiber layer with a filler is used as a heat-insulating felt with a glass fiber layer with a filler, and the glass beads as a filler are filled inside the glass fiber layer and the thermal shock resistant coating layer is applied on both the inside and outside. In addition to thermal protection, the insulation felt also has excellent thermal shock resistance, where the filler glass beads can improve the performance of the glass fiber layer itself by its high temperature resistance and strength, making it both internal and external. The thermal shock-resistant coating layer on both sides protects and reinforces the glass fiber layer, reducing damage to the internal structure of the glass fiber layer due to severe temperature changes.

Example 9
This is a thermal insulation felt having thermal shock resistance performance, and all other aspects are the same as in Example 1 except that the thermal shock resistant coating layer is applied only to one side of the filled glass fiber layer.

The performance of the heat-retaining felt obtained in Example 9 was detected, and the heat-retaining performance and thermal shock resistance were tested respectively, and the average values were taken and recorded as the measurement results, as shown in the table below.

From the table above, the thermal insulation felt obtained in Example 9 still has excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.038 W/(K m). It decreased by only 0.003 W/(K・m) compared to Example 1, and the time until failure at 1000°C and 5 Bar air pressure reached 75 min, which was only 10 min shorter than the time in Example 1. It was found that the thermal shock resistant coating layer on one side can also effectively improve the thermal insulation performance and thermal shock resistant performance of the thermal insulation felt, and its application situation mainly depends on the actual application environment, that is, the protection target. may be adjusted based on actual usage requirements and production costs, and should not be considered as a limitation on the present application.

Example 10
It is a heat-retaining felt having thermal shock resistance performance, and except for the coating process of the thermal shock resistance coating layer of S3 being different, everything else is the same as in Example 1, specifically,
The coating thickness of the thermal shock resistant coating layer was 0.1 mm. After applying the thermal shock resistant coating material on both sides of the glass fiber layer, it was cured at 250°C for 1 hour, and the drying and curing of the thermal shock resistant coating layer was determined by measurement. The final actual thickness is 0.05 mm.

Example 11
It is a heat-retaining felt having thermal shock resistance performance, and except for the coating process of the thermal shock resistance coating layer of S3 being different, everything else is the same as in Example 1, specifically,
The coating thickness of the thermal shock resistant coating layer is 1.0 mm, and after coating the thermal shock resistant coating material on both sides of the glass fiber layer, it is cured at 250°C for 1 hour, and the drying and curing of the thermal shock resistant coating layer is determined by measurement. The actual thickness at the end is 0.5 mm.

Example 12
It is a heat-retaining felt having thermal shock resistance performance, and except for the coating process of the thermal shock resistance coating layer of S3 being different, everything else is the same as in Example 1, specifically,
The coating thickness of the thermal shock resistant coating layer was 2.0 mm, and after applying the thermal shock resistant coating material on both sides of the glass fiber layer, it was cured at 250°C for 1 hour, and the drying and curing of the thermal shock resistant coating layer was determined by measurement. The final actual thickness is 1.0 mm.

Example 13
The heat-retaining felt has thermal shock resistance, and the difference from Example 1 is that the coating process of the thermal shock-resistant coating layer of S3 is different, and everything else is the same as Example 1. for,
The coating thickness of the thermal shock resistant coating layer is 0.3 mm, and after coating the thermal shock resistant coating material on both sides of the glass fiber layer, it is cured at 250°C for 5 hours, and the drying and curing of the thermal shock resistant coating layer is determined by measurement. The actual thickness at the end is 0.15 mm.

Example 14
It is a heat-retaining felt having thermal shock resistance performance, and except for the coating process of the thermal shock resistance coating layer of S3 being different, everything else is the same as in Example 1, specifically,
The coating thickness of the thermal shock resistant coating layer is 0.3 mm, and after coating the thermal shock resistant coating material on both sides of the glass fiber layer, it is cured at 500°C for 5 hours, and the drying and curing of the thermal shock resistant coating layer is determined by measurement. The actual thickness at the end is 0.15 mm.

Example 15
It is a heat-retaining felt having thermal shock resistance performance, and except for the coating process of the thermal shock resistance coating layer of S3 being different, everything else is the same as in Example 1, specifically,
The coating thickness of the thermal shock resistant coating layer is 0.3 mm, and after coating the thermal shock resistant coating material on both sides of the glass fiber layer, it is cured at 600°C for 6 hours, and the drying and curing of the thermal shock resistant coating layer is determined by measurement. The actual thickness at the end is 0.15 mm.

The performance of the thermal insulation felts obtained in Examples 10 to 15 was detected, and the thermal insulation performance and thermal shock resistance were tested respectively, and the average values were taken and recorded as the measurement results, as shown in the table below.

From the table above, all of the thermal insulation felts obtained in Examples 10 to 14 have excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.028 to 0.060 W/( It was found that the time to failure at 1000°C and 5 Bar air pressure reached 50 to 95 min, which means that the thermal shock resistant coating layer cured with the above coating thickness, temperature and heating time is , showed that the composite effect with the glass fiber layer was good, and the reason was analyzed, and it was found that under the above process conditions, the thermal shock-resistant coating material could partially penetrate into the glass fiber layer, and then the curing was completed. After that, the influence of temperature on the glass fiber layer can be effectively reduced.

In particular, when the temperature exceeds 500°C and the heating time exceeds 5 hours, the insulation effect decreases significantly, and referring to Example 15, the thermal conductivity at 25°C reaches 0.11 W/(K m). , the time to failure at 1000°C and 5 Bar air pressure is only 38 minutes, and the reason for this is that most of the thermal shock-resistant coating layer penetrates into the glass fiber layer, causing the surface of the glass fiber layer to deteriorate. The thermal shock-resistant coating layer cannot effectively block the influence of temperature on the glass fiber layer, and under the above temperature conditions, the glass fiber may be slightly softened and the internal structure may change. Guessed.

Furthermore, from the above table, the thermal insulation felt manufactured in Example 12 has excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.028W/(K・m), and the thermal conductivity of 1000 The time to failure at ℃ and 5 Bar air pressure reached 95 min, indicating that Example 12 was the optimal example, and the thermal shock resistant coating layer applied under the process conditions was less affected by the external temperature on the glass fiber layer. This resulted in a significant improvement in the performance of the insulation felt.

In summary, the thermal shock-resistant coating layer cured at the above temperature and heating time has a good composite effect with the glass fiber layer, and protects and reinforces the glass fiber layer from the outside of the glass fiber layer. In addition to reducing the influence of temperature, the internal structure of the glass fiber layer becomes less likely to be destroyed by drastic temperature changes, which in turn gives the insulation felt excellent heat retention performance and thermal shock resistance.

Example 16
A heat-retaining felt having thermal shock-resistant performance, in which the phosphate in the thermal shock-resistant coating material is composed of dihydrogen phosphate and hydrogen phosphate at a weight ratio of 1:1, and all other elements are implemented. Same as example 1.

Example 17
A heat-retaining felt having thermal shock-resistant performance, except that the phosphate in the thermal shock-resistant coating material consists of dihydrogen phosphate and orthophosphate in a weight ratio of 1:1. is the same as

Example 18
A heat-retaining felt having thermal shock resistance, except that the phosphate in the thermal shock-resistant coating material is composed of dihydrogen phosphate, hydrogen phosphate, and orthophosphate in a weight ratio of 1:1:1. The other aspects are the same as in Example 1.

Example 19
A heat-retaining felt having thermal shock-resistant performance, wherein the phosphates in the thermal shock-resistant coating material include dihydrogen phosphate, hydrogen phosphate, and orthophosphate in a weight ratio of 1:1:1:1; Other than the metaphosphate, everything else is the same as in Example 1.

The performance of the thermal insulation felts obtained in Examples 16 to 19 was detected, and the thermal insulation performance and thermal shock resistance were tested respectively, and the average values were taken and recorded as the measurement results, as shown in the table below.

From the table above, all of the thermal insulation felts obtained in Examples 16 to 19 have excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.031-0.035 W/( It was found that the time until failure reached 85 to 91 min at 1000°C and 5 Bar air pressure, which means that the above components of phosphate ensure the strength and density of the coating layer. This shows that the thermal shock resistant coating layer has excellent thermal shock resistance.

Furthermore, from the above table, the thermal insulation felt manufactured in Example 19 has excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.031 W/(K・m), and the thermal conductivity of 1000 ℃ and 5 Bar air pressure reached 91 min, indicating that Example 19 is the optimal example, and from this it can be seen that the phosphate in the thermal shock resistant coating layer was in a weight ratio of 1:1:1:1. It can be seen that the thermal shock-resistant coating layer has the best performance when it is composed of dihydrogen phosphate, hydrogen phosphate, orthophosphate, and metaphosphate.

In summary, after compounding different types of phosphates, the compounding cooperation between different phosphate molecules is to some extent advantageous, and the three-dimensional cross-linked structure formed by compounding can significantly improve its adhesion force. , can also promote its setting and hardening role, thereby ensuring the strength and density of the coating layer, and providing the thermal shock-resistant coating layer with excellent thermal shock-resistant performance.

Example 20
The heat-retaining felt has thermal shock resistance, and the thickness of the obtained glass fiber cloth is 1.0 mm, and the weaving density of warp or weft is 15 threads/cm, and all other conditions are not met. Same as example 1.

Example 21
The heat-retaining felt has thermal shock resistance, and the thickness of the obtained glass fiber cloth is 3.0 mm, and the weaving density of warp or weft is 15 threads/cm, and all other conditions are not met. Same as example 1.

Example 22
The heat-retaining felt has thermal shock resistance, and the thickness of the obtained glass fiber cloth is 2.0 mm, and the weaving density of the warp or weft is 25 threads/cm, and all other conditions are not met. Same as example 1.

Example 23
The heat-retaining felt has thermal shock resistance, and the thickness of the obtained glass fiber cloth is 2.0 mm, and the weaving density of the warp or weft is 30 threads/cm, and all other conditions are not met. Same as example 1.

Example 24
Thermal insulation felt has thermal shock resistance, and the glass fiber layer is formed by a needling method, that is, cutting the glass fibers into single fiber filaments, agglomerating the fiber filaments to obtain a glass fiber network, and then needling. Glass fiber felt is produced by using a machine to puncture the glass fiber net up and down, intertwining the fibers with each other, and reinforcing it to obtain glass fiber felt, and the thickness of the resulting glass fiber cloth is The length is 2.0 mm, and the weaving density of the warp or weft is 15 threads/cm, but everything else is the same as in Example 1.

The performance of the heat insulation felts obtained in Examples 20 to 24 was detected, and the heat retention performance and thermal shock resistance performance were tested respectively, and the average values were taken and recorded as the measurement results, as shown in the table below.

From the table above, the thermal insulation felts obtained in Examples 20 to 24 all have excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.027-0.043 W/( It was found that the time to failure at 1000°C and 5 Bar air pressure reached 73 to 92 minutes, which means that the glass fiber layer with the above thickness and weaving density has excellent usage effects. and when the weaving density is constant, the higher the thickness, the better the heat retention performance.

From the above table, it can be further seen that the thermal felt produced in Example 21 has excellent heat retention performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.029 W/(K m), and the thermal conductivity of 1000 It was found that the time to breakage reached 92 min at ℃ and 5 Bar air pressure. From this, it can be seen that Example 21 is the optimum example, the thickness of the glass fiber cloth is 3.0 mm, and the weave density of the warp or weft is It can be seen that when the number of fibers/cm is 15, the heat-insulating and heat-insulating performance of the heat-insulating felt is the best.

From the above table, it can be seen that when the glass fiber layer is glass fiber felt, its heat retention performance is improved to some extent, and the thermal shock resistance performance is slightly decreased. is only 0.027 W/(K・m), and the time until failure at 1000°C and 5 Bar air pressure reaches 83 min. From this, it can be seen that Example 24 is the optimum example, and the glass fiber layer is made of glass fiber felt. In this case, it was found that the thermal insulation performance of the thermal felt is superior.The reason for this was analyzed and it was found that the distribution of the gaps between the fibers is more disordered in the glass fiber felt compared to the glass fiber cloth. Further improvements are advantageous, but may be due to the fact that the structure is lighter and sparser, and its tensile strength and thermal shock performance are slightly reduced.

In summary, when the above glass fiber cloth and glass fiber felt are used as a glass fiber layer, they both have excellent usage effects, the thicker the thickness, the better the heat retention performance, and if the weave density is too loose, If the number of bonding sites for glass beads is too small and the weave density is too dense, the injection of glass beads will be affected, and the heat retention and heat resistance performance of the insulation felt will be reduced.

Example 25
Other conditions were the same as in Example 1 except that the insulation felt had thermal shock resistance and the glass fiber was Z-Tex plus ^™ .

Example 26
All other conditions were the same as in Example 1 except that the insulating felt had thermal shock resistance and the glass fiber was Z-Tex super ^TM .

Example 27
All other conditions were the same as in Example 1 except that the insulating felt had thermal shock resistance and the glass fiber was Z-Tex ultra ^™ .

Example 28
This is a heat-retaining felt having thermal shock resistance, and except for using Z-Tex plus ^TM and Z-Tex ultra ^TM as glass fibers in a weight ratio of 1:1, all other conditions are as in Example. Same as 1.

Example 29
It is a thermal insulation felt with thermal shock resistance performance, the glass fiber is commercially available glass fiber, the length is 25 mm, the diameter is 10 μm, the trademark is CR21-2400, and it is manufactured by Wuhu Baiyun Fiber Co., Ltd. All other conditions were the same as in Example 1 except that the fibers were purchased from Baiyun Glass Fiber Co., Ltd.).

The performance of the thermal insulation felts obtained in Examples 25 to 29 was detected, and the thermal insulation performance and thermal shock resistance performance were tested respectively, and the average value was taken and recorded as the measurement results, as shown in the table below.

From the table above, the thermal insulation felts obtained in Examples 25 to 28 all have excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.029 to 0.035 W/( It was found that the time to failure at 1000°C and 5 Bar air pressure reached 85-93 min, which means that all the above glass fibers have excellent application effects, and the It was shown that the glass fiber layer can effectively guarantee the heat retention performance and thermal shock resistance of the insulation felt.
Here, the heat resistance and heat retention performance of the glass fibers of Examples 25 to 28 increased in order, and from this it was found that Z-Tex ultra ^TM is a preferable glass fiber. It is advantageous to increase the number and disorder of the insulation felt, so that with the same weaving density, there are more bonding sites for glass beads, which is advantageous for filling glass beads, which improves the thermal insulation performance and thermal shock resistance of the insulation felt. Guaranteed performance.

From the above table, compared to Example 1, Example 29 has a thermal conductivity of 0.13 W/(K m) at 25°C, which is a 271% increase compared to Example 1, and at 1000°C and 5 Bar. It was found that the time until failure under air pressure was only 67 min, which was 21% shorter than in Example 1, and from this it can be concluded that the glass fibers used in this application can effectively guarantee the performance of the final product. I understand.

In summary, the selection of glass fibers is closely related to the final performance of the product, and the glass fiber layer formed by spinning the glass fibers of the above model has a dense and strong structure after being filled with glass beads. At the same time, deformation due to heat or the like is less likely to occur, and more bonding sites can be provided to the thermal shock resistant coating layer, thereby making the bonding of the thermal shock resistant coating layer stronger and denser.

Example 30
It is a thermal insulation felt having thermal shock resistance performance, and the raw material composition and content of the hollow glass beads are, in weight percent, 60% SiO ₂ , 10% Al ₂ O ₃ , and 30% ZrO ₂ . All other conditions are the same as in Example 1.

Example 31
It is a thermal insulation felt having thermal shock resistance performance, and the raw material composition and content of the hollow glass beads are, in weight percent, 60% SiO ₂ , 30% Al ₂ O ₃ , and 10% ZrO ₂ . All other conditions are the same as in Example 1.

Example 32
It is a thermal insulation felt having thermal shock resistance performance, and the raw material composition and content of the hollow glass beads are, in weight percent, 40% SiO ₂ , 50% Al ₂ O ₃ , and 10% ZrO ₂ . All other conditions are the same as in Example 1.

Example 33
This is a heat-retaining felt having thermal shock resistance, and the filler is airgel SiO ₂ with a particle size of 0.5 mm, and all other conditions are the same as in Example 1.

The performance of the thermal insulation felts obtained in Examples 30 to 33 was detected, and the thermal insulation performance and thermal shock resistance were tested respectively, and the average values were taken and recorded as the measurement results, as shown in the table below.

From the above table, the thermal insulation felts obtained in Examples 30 to 33 all have excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.029 to 0.035 W/( It was found that the time until failure reached 85 to 89 min at 1000°C and 5 Bar air pressure, indicating that the hollow glass beads of the above composition have an excellent filling effect in the glass fiber layer. In addition, it is shown that the glass fiber layer itself has excellent high temperature resistance and heat insulation performance.

From the above table, it can be seen that when the filler is airgel _SiO2 , it still has excellent heat retention performance and thermal shock resistance, but compared to the case of using hollow glass beads, both of them are degraded to different degrees, and Example 32 is As a reference, it is found that the thermal conductivity at 25℃ is only 0.039W/(K・m), and the time to failure at 1000℃ and 5Bar air pressure reaches 80min. It was found to be an excellent filler, and after analyzing the causes, it was found that the glass beads with the above components have a denser structure, higher hardness, and lower thermal conductivity, which in turn combined with the glass fiber layer system. This may be due to the fact that it can efficiently exhibit its heat retention performance and thermal shock resistance, and when airgel _SiO2 is used, excellent heat retention performance can be obtained, but the structural characteristics of the airgel filler itself This is disadvantageous to the thermal shock resistance and mechanical performance of the insulation felt.

Example 34
The heat-insulating felt has thermal shock resistance, and the hollow glass beads have a particle size of 50 μm and are injected at a weight ratio of 1:3, but all other conditions are the same as in Example 1.

Example 35
The heat-retaining felt has thermal shock resistance, and the hollow glass beads have a particle size of 50 μm and are injected at a weight ratio of 1:7, but all other conditions are the same as in Example 1.

Example 36
The heat-retaining felt has thermal shock resistance, and the hollow glass beads have a particle size of 10 μm and are injected at a weight ratio of 1:5, but all other conditions are the same as in Example 1.

Example 37
The heat-retaining felt has thermal shock resistance, and the hollow glass beads have a particle size of 100 μm and are injected at a weight ratio of 1:5, but all other conditions are the same as in Example 1.

The performance of the thermal insulation felts obtained in Examples 34 to 37 was detected, and the thermal insulation performance and thermal shock resistance were tested respectively, and the average value was recorded as the measurement results, as shown in the table below.

From the table above, it can be seen that the thermal insulation felts obtained in Examples 34 to 37 all have excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.029-0.041W/( It was found that the time until failure reached 83 to 89 min at 1000°C and 5 Bar air pressure. The performance and thermal shock resistance performance can be effectively improved, and when the particle size is constant, the more filling proportion, the better the heat preservation performance, but based on the actual usage requirements and production cost, 1:(3~ 7) is indicated as preferred; in other embodiments, higher proportions may be chosen and should not be considered as limiting the present application.

From the table above, referring to Example 1 and Examples 36-37, when the particle size of glass beads changes, its heat retention performance and thermal shock resistance performance also change correspondingly, and the thermal conductivity at 25°C is slightly 0.029~0.041W/(K・m), and the time to failure at 1000℃ and 5Bar air pressure reaches 83~89min.From this, it can be seen that if other conditions are the same, hollow It has been found that the smaller the particle size of the glass beads, the better their performance, and the reason for this can be attributed to the fact that when the particle size is small, both its packing density and strength are higher.

In summary, the hollow glass beads with the above particle size and specific gravity can not only further ensure the packing density and strength of the hollow glass beads and glass fiber layer, but also have less effect on the uniformity and bonding strength of the coating layer, thereby , ensuring the high temperature resistance and insulation performance of the glass fiber layer.

Example 38
The heat-retaining felt has thermal shock resistance and the coupling agent is KH-570, but all other conditions are the same as in Example 1.

Example 39
The heat-retaining felt has thermal shock resistance, and the coupling agent is KH-602, but all other conditions are the same as in Example 1.

Example 40
The heat-retaining felt has thermal shock resistance and the coupling agent is KH-792, but all other conditions are the same as in Example 1.

Example 41
This is a heat-retaining felt having thermal shock resistance, and except that the coupling agent is Sj-42, all other conditions are the same as in Example 1.

Example 42
This is a heat-retaining felt having thermal shock resistance, and the other conditions are the same as in Example 1 except that the coupling agent is composed of KH-602 and KH-792 in a weight ratio of 1:1.

Example 43
This is a heat-retaining felt having thermal shock resistance, and all other conditions are the same as in Example 1 except that the coupling agent is composed of KH-550 and KH-570 in a weight ratio of 1:1.

The performance of the thermal insulation felts obtained in Examples 38-43 was detected, and the thermal insulation performance and thermal shock resistance were tested respectively, and the average values were taken and recorded as the measurement results, as shown in the table below.

From the table above, the thermal insulation felts obtained in Examples 38 to 43 all have excellent thermal insulation performance and thermal shock resistance, and the thermal conductivity at 25°C is only 0.032 to 0.036 W/( K・m), and it was found that the time to failure at 1000°C and 5 Bar air pressure reached 84 to 87 min. This shows that the performance can be effectively improved, and that the improvement in performance is even more remarkable when multiple coupling agents are used in combination at the same time.

From the above table, it can be seen that the thermal felt produced in Example 43 has excellent heat retention performance and thermal shock resistance, and has a thermal conductivity of only 0.032 W/(K m) at 25°C, and a thermal conductivity of 1000 It was found that the time to failure reached 87 min at ℃ and 5 Bar air pressure, and from this it was found that Example 43 is a preferred example, and the coupling agent was KH-550 and KH-570 in a weight ratio of 1:1. In the case of , the thermal insulation performance of the thermal insulation felt is the best.

In summary, the above component silane coupling agent can effectively improve the connection strength between the thermal shock resistant coating layer and the glass fiber layer, and in turn the thermal shock resistant coating layer can be firmly attached to both sides of the glass fiber layer. It can play the role of protection and heat insulation for the glass fiber layer, and when multiple sets are combined, it can form a three-dimensional spatial structure cross-connection, and the structure is stronger and the adhesion is better.

The specific examples are only an interpretation of the present application, and are not intended to limit the present application, and those skilled in the art may, after reading this specification, make any creative contributions to the examples as needed. Although changes may be made, any changes within the scope of the claims of this application are protected by patent law.

Claims (11)

It has a layered structure and consists of a filled glass fiber layer and a thermal shock resistant coating layer, the thermal shock resistant coating layer being applied on one or both sides of the filled glass fiber layer,
The filler is hollow glass beads or airgel _SiO2 ,
The thermal shock resistant coating layer is obtained by applying a thermal shock resistant coating material on one or both sides of a glass fiber layer with a filler, and then drying and curing it,
The raw material composition and content of the thermal shock resistant coating material are, in weight percent, 10 to 50% SiO ₂ , 5 to 60% ZnO, 5 to 40% Al ₂ O ₃ , and 5 to 15% polytetrafluorocarbon. Ethylene, 5-35% silane coupling agent, 15-50% phosphate,
A heat-retaining felt with thermal shock resistance. The coating thickness is 0.02 to 1.5 mm, and the drying and curing includes curing for 1 to 5 hours at a temperature of 250 to 500°C.
The heat-retaining felt having thermal shock resistance according to claim 1. The phosphate in the thermal shock-resistant coating material is one or more of dihydrogen phosphate, hydrogen phosphate, orthophosphate, and metaphosphate.
The heat-retaining felt having thermal shock resistance according to claim 1. The glass fiber layer is a glass fiber cloth or glass fiber felt made from glass fibers,
The thickness of the glass fiber layer is 1.0 to 3.0 mm, and the weaving density of warp or weft is 15 to 30 threads/cm.
The heat-retaining felt having thermal shock resistance according to claim 1. The glass fibers are continuous glass fibers with a diameter of 6 to 24 μm, and the glass fibers are made from Z-Tex Series: Z-Tex ^™ , Z-Tex plus ^™ , Z-Tex super ^™ , Z-Tex ultra ^™. One or more selected types,
The heat-retaining felt having thermal shock resistance according to claim 4. The raw material composition and content of the hollow glass beads are, in weight percent, 50 to 80% SiO ₂ , 10 to 70% Al ₂ O ₃ , and 10 to 30% ZrO ₂ .
The heat-retaining felt having thermal shock resistance according to claim 1. The particle size of the hollow glass beads is ≦100 μm, and the amount of the hollow glass beads used is a weight ratio of hollow glass beads:glass fiber cloth or glass fiber felt of 1:(3 to 7).
The heat-retaining felt having thermal shock resistance according to claim 6. The silane coupling agent is one or more of KH-550, KH-570, KH602, KH792, and Sj-42,
The heat-retaining felt having thermal shock resistance according to claim 1. S1, manufacturing step of glass fiber layer;
S2, manufacturing a glass fiber layer with a filler to obtain a glass fiber layer with a filler by injecting a filler into the glass fiber layer;
S3. First, use one of roller coating, rolling, and blade coating to apply thermal shock-resistant coating material on both sides of the glass fiber layer with filler, and the coating thickness is 0.02~1. 0mm, and then curing for 1 to 5 hours at a temperature of 250 to 500°C to obtain a thermal shock resistant felt.
The method for producing a heat-retaining felt having thermal shock resistance according to any one of claims 1 to 8. The glass fiber layer is a glass fiber cloth manufactured by a spinning method, or a glass fiber felt manufactured using any one of needling, wet method, and dry method.
The method for producing a heat-retaining felt having thermal shock resistance according to claim 9. The raw material composition and content are 10 to 50% SiO ₂ , 5 to 60% ZnO, 5 to 40% Al ₂ O ₃ , 5 to 15% PTFE, and 5 to 35% silane cup. ring agent, 15-50% phosphate;
A thermal shock-resistant coating material characterized by: