Ceramic silica gel foam aerogel sheet and preparation method thereof

Abstract

The invention relates to the technical field of ceramic silica gel foam aerogel preparation, and discloses a ceramic silica gel foam aerogel sheet and a preparation method thereof. Comprising the following raw materials in parts by weight: 10-30 parts of aerogel powder, 10-30 parts of glass powder, 10-30 parts of one or a mixture of calcium silicate / mica powder / kaolin / wollastonite, 20-30 parts of aluminum hydroxide, 30-50 parts of hydroxyl silicone oil, 100 parts of organosiloxane, 0.1-0.5 part of a catalyst, 20-30 parts of hydrogen-containing silicone oil and 1-5 parts of color paste, the aerogel is silicon dioxide aerogel powder, the density is 1.5 MG / ML, the pore diameter is 10-50 NM, and the pore diameter is 10-50 NM. The glass powder is low-melting-point ceramic powder, and the particle size of the glass powder is 1-20 UM. The preparation method is simple, the process is easy to control, and the quality is stable. The prepared silica gel foam aerogel internally contains a uniform closed pore structure, so that the thermal insulation and sound insulation effects are greatly improved; the rebound resilience is good, and the gap filling effect of a current aerogel product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ceramicizable silica foam aerogel production, and in particular to a ceramicizable silica foam aerogel sheet and a preparation method thereof. Background Art

[0002] Aerogel thermal insulation sheets play the roles of thermal insulation, buffering, and noise reduction in aerospace, new energy thermal runaway protection, industrial insulation and other fields.

[0003] At present, aerogels mostly use ceramic glass fiber as a carrier, which will cause powder shedding during processing and use, reducing the thermal insulation effect and polluting the environment. In addition, the ceramic glass fiber carrier will collapse when exposed to high temperatures, resulting in a significant decrease in the thermal insulation effect. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a ceramicized silica foam aerogel sheet and a preparation method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A ceramicized silica gel foam aerogel sheet comprises the following raw materials in parts by weight: 10-30 parts of aerogel powder, 10-30 parts of glass powder, 10-30 parts of one or a mixture of calcium silicate / mica powder / kaolin / wollastonite, 20-30 parts of aluminum hydroxide, 30-50 parts of hydroxy silicone oil, 100 parts of organic siloxane, 0.1-0.5 parts of catalyst, 20-30 parts of hydrogenated silicone oil and 1-5 parts of color paste.

[0007] As a further technical solution of the present invention, the aerogel is a silica aerogel powder with a density of 1.5 MG / ML and a pore size of 10-50 NM.

[0008] As a further technical solution of the present invention, the glass powder is a low melting point ceramic powder with a particle size of 1-20 UM.

[0009] As a further technical solution of the present invention, the calcium silicate / mica powder / kaolin / wollastonite and the mixture thereof have a fineness of 500-3000 mesh, and the aluminum hydroxide is a powder with a fineness of 2000-3000 mesh.

[0010] As a further technical solution of the present invention, the hydroxy silicone oil is terminal hydroxyl polydimethylsiloxane with a viscosity of 100-500 CPS, and the catalyst is a platinum catalyst with a PT content of 500-1000 PPM.

[0011] As a further technical solution of the present invention, the organosiloxane is vinyl-terminated polydimethylsiloxane with a viscosity of 100,000 CPS and a hardness of 70 degrees Shore A.

[0012] As a further technical solution of the present invention, the hydrogen-containing silicone oil is methyl hydrogen-containing silicone oil with a viscosity of 50-200 CPS, and the color paste is a colorant prepared with hydroxy silicone oil with a viscosity of 5000-10000 CPS.

[0013] The present invention provides a method for preparing a ceramicized silica foam aerogel sheet, comprising the following steps:

[0014] S1: 10-30 parts of aerogel powder, 20-30 parts of aluminum hydroxide, 30-50 parts of hydroxy silicone oil, 100 parts of organosiloxane, 0.1-0.5 parts of catalyst. 1-5 parts of color paste are mixed and added into a kneader for kneading and stirring at a meshing speed of 50-100 rpm for 2-3 hours to obtain a toned mixture A, which is then put into a container for standby use;

[0015] S2: 20-30 parts of glass powder, 10-30 parts of one or a mixture of calcium silicate / mica powder / kaolin / wollastonite, and 20-30 parts of hydrogen-containing silicone oil are mixed and added into a kneader for kneading and stirring at a speed of 50-100 rpm for 2-3 hours to obtain a milky white mixture B, which is put into a container for standby use;

[0016] S3: The mixtures A and B obtained above are charged into a mixer and mixed in a ratio of 2:1 to obtain a mixture C;

[0017] S4: The mixture is coated on a Teflon release film and subjected to a high temperature of 100-150 degrees for 60 minutes to obtain a silicone foam aerogel sheet.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention has a simple production method, easy process control and stable quality. The prepared silica foam aerogel contains a uniform closed-cell structure inside, which greatly improves the thermal insulation and sound insulation effects; it has good rebound performance, which improves the gap filling effect of current aerogel products; it can work under high temperature conditions of 200°C for a long time, and after a 24-hour test at 100°C and 25% compression, the permanent compression deformation is less than 2%; under extreme conditions exceeding 600°C, the foam can be ceramicized, the internal closed-cell structure remains unchanged, and the aerogel is evenly distributed in its original state, and it can still exert a high thermal insulation effect. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0022] Example 1

[0023] A ceramicizable silica foam aerogel sheet and a preparation method thereof, comprising the following steps:

[0024] S1: Take 10 parts of aerogel powder, 20 parts of aluminum hydroxide, 50 parts of hydroxy silicone oil, 100 parts of organosiloxane, 0.3 parts of catalyst and 1 part of color paste, mix them and add them into a barrel, knead and stir, set the stirring speed to 100 rpm, vacuum the barrel to -0.5MP, set the barrel cooling cycle temperature to 10°C, and the time is 3 hours to obtain the toned mixture A, which is put into a container for standby use;

[0025] S2: 20 parts of glass powder, 20 parts of wollastonite and 30 parts of hydrogenated silicone oil are mixed and added into a barrel for kneading and stirring. The stirring speed is set to 100 rpm. The barrel is vacuumed to -0.5MP. The barrel cooling cycle temperature is set to 10°C for 3 hours to obtain a toned mixture B, which is then put into a container for standby use.

[0026] S3: The mixtures A and B obtained above are charged into a mixer and mixed in a ratio of 2:1 to obtain a mixture C;

[0027] S4: Place a roll of release film on the upper and lower sides of the coating machine, set the tension to 0.5N / M; set the speed to 1M / min; set the effective gap height of the calender roller to remove the release film thickness to 1MM;

[0028] S5: The mixture C is coated on the Teflon release film, and then the upper surface of the mixture C coating is covered with the release film, and after passing through the calender roller, a coating with an ideal thickness is obtained, and then placed in a drying oven;

[0029] S6: The drying tunnel uses 2M*30 sections, totaling 60M. The temperature of sections 1-14 is set at 100℃, sections 15-28 are set at 150℃, and sections 29-30 are not set to a temperature, and are cooled by blowing air. The belt running speed is set to 2M / min;

[0030] S7: After being heated and cured in a drying oven for 60 minutes, the upper and lower release films are peeled off and rolled up to obtain the ceramicizable silica foam aerogel sheet of the present invention.

[0031] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: through the above production test, a ceramicized silica gel foam aerogel sheet is obtained, the surface of the product is smooth and balanced, without openings; the cross-section pores are finely and evenly distributed, the thickness is 3.4-3.6MM, the foaming ratio is 3.4-3.6 times, and the density is 0.37G / CM 3 , the thermal conductivity is 0.025W / MK at room temperature.

[0032] Example 2

[0033] A ceramicizable silica foam aerogel sheet and a preparation method thereof, comprising the following steps:

[0034] S1: Take 30 parts of aerogel powder, 20 parts of aluminum hydroxide, 50 parts of hydroxy silicone oil, 100 parts of organosiloxane, 0.3 parts of catalyst and 1 part of color paste, mix them and add them into a barrel, knead and stir, set the stirring speed to 100 rpm, vacuum the barrel to -0.5MP, set the barrel cooling cycle temperature to 10°C, and the time is 3 hours to obtain the toned mixture A, which is put into a container for standby use;

[0035] S2: 20 parts of glass powder, 20 parts of wollastonite and 30 parts of hydrogenated silicone oil are mixed and added into a barrel for kneading and stirring. The stirring speed is set to 100 rpm. The barrel is vacuumed to -0.5MP. The barrel cooling cycle temperature is set to 10°C for 3 hours to obtain a toned mixture B, which is then put into a container for standby use.

[0036] S3: The mixtures A and B obtained above are charged into a mixer and mixed in a ratio of 2:1 to obtain a mixture C;

[0037] S4: Place a roll of release film on the upper and lower sides of the coating machine, set the tension to 0.5N / M; set the speed to 1M / min; set the effective gap height of the calender roller to remove the release film thickness to 1MM;

[0038] S5: The mixture C is coated on the Teflon release film, and then the upper surface of the mixture C coating is covered with the release film, and after passing through the calender roller, a coating with an ideal thickness is obtained, and then placed in a drying oven;

[0039] S6: The drying tunnel uses 2M*30 sections, totaling 60M. The temperature of sections 1-14 is set at 100℃, sections 15-28 are set at 150℃, and sections 29-30 are not set to a temperature, and are cooled by blowing air. The belt running speed is set to 2M / min;

[0040] S7: After being heated and cured in a drying oven for 60 minutes, the upper and lower release films are peeled off and rolled up to obtain the ceramicizable silica foam aerogel sheet of the present invention.

[0041] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the surface of the product is smooth and balanced, without openings; the pores on the cross section are finely and evenly distributed, the thickness is 3.1-3.4MM, the foaming ratio is 3.1-3.4 times, and the density is 0.4G / CM 3 , the thermal conductivity is 0.01W / MK at room temperature.

[0042] Example 3

[0043] A ceramicizable silica foam aerogel sheet and a preparation method thereof, comprising the following steps:

[0044] S1: Take 10 parts of aerogel powder, 20 parts of aluminum hydroxide, 40 parts of hydroxy silicone oil, 100 parts of organosiloxane, 0.3 parts of catalyst and 1 part of color paste, mix them and add them into a barrel, knead and stir, set the stirring speed to 100 rpm, vacuum the barrel to -0.5MP, set the barrel cooling cycle temperature to 10°C, and the time is 3 hours to obtain the toned mixture A, which is put into a container for standby use;

[0045] S2: 20 parts of glass powder, 20 parts of wollastonite and 30 parts of hydrogenated silicone oil are mixed and added into a barrel for kneading and stirring. The stirring speed is set to 100 rpm. The barrel is vacuumed to -0.5MP. The barrel cooling cycle temperature is set to 10°C for 3 hours to obtain a toned mixture B, which is then put into a container for standby use.

[0046] S3: The mixtures A and B obtained above are charged into a mixer and mixed in a ratio of 2:1 to obtain a mixture C;

[0047] S4: Place a roll of release film on the upper and lower sides of the coating machine, set the tension to 0.5N / M; set the speed to 1M / min; set the effective gap height of the calender roller to remove the release film thickness to 1MM;

[0048] S5: The mixture C is coated on the Teflon release film, and then the upper surface of the mixture C coating is covered with the release film, and after passing through the calender roller, a coating with an ideal thickness is obtained, and then placed in a drying oven;

[0049] S6: The drying tunnel uses 2M*30 sections, totaling 60M. The temperature of sections 1-14 is set at 100℃, sections 15-28 are set at 150℃, and sections 29-30 are not set to a temperature, and are cooled by blowing air. The belt running speed is set to 2M / min;

[0050] S7: After being heated and cured in a drying oven for 60 minutes, the upper and lower release films are peeled off and rolled up to obtain the ceramicizable silica foam aerogel sheet of the present invention.

[0051] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: the surface of the product is smooth and balanced, without openings; the cross-section pores are finely and evenly distributed, the thickness is 2.8-3.0MM, the foaming ratio is 2.8-3.0 times, and the density is 0.42G / CM 3 , the thermal conductivity is 0.03W / MK at room temperature.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ceramicizable silica foam aerogel sheet and a preparation method thereof, characterized in that: The invention comprises the following raw materials in parts by weight: 10-30 parts of aerogel powder, 10-30 parts of glass powder, 10-30 parts of one or a mixture of calcium silicate / mica powder / kaolin / wollastonite, 20-30 parts of aluminum hydroxide, 30-50 parts of hydroxy silicone oil, 100 parts of organic siloxane, 0.1-0.5 parts of catalyst, 20-30 parts of hydrogen-containing silicone oil and 1-5 parts of color paste.

2. The ceramicizable silica foam aerogel sheet according to claim 1, characterized in that: The aerogel is silicon dioxide aerogel powder with a density of 1.5 MG / ML and a pore size of 10-50 NM.

3. The ceramicizable silica foam aerogel sheet according to claim 2, characterized in that: The glass powder is a low melting point ceramic powder with a particle size of 1-20 um.

4. The ceramicizable silica foam aerogel sheet according to claim 3, characterized in that: The calcium silicate / mica powder / kaolin / wollastonite and the mixture thereof have a fineness of 500-3000 mesh, and the aluminum hydroxide is a powder with a fineness of 2000-3000 mesh.

5. The ceramicizable silica foam aerogel sheet according to claim 4, characterized in that: The hydroxy silicone oil is hydroxy-terminated polydimethylsiloxane with a viscosity of 100-500 CPS, and the catalyst is a platinum catalyst with a PT content of 500-1000 PPM.

6. The ceramicizable silica foam aerogel sheet according to claim 5, characterized in that: The organosiloxane is vinyl-terminated polydimethylsiloxane with a viscosity of 100,000 CPS and a hardness of 70 degrees Shore A.

7. The ceramicizable silica foam aerogel sheet according to claim 6, characterized in that: The hydrogen-containing silicone oil is methyl hydrogen-containing silicone oil with a viscosity of 50-200 CPS, and the color paste is a colorant prepared with hydroxy silicone oil with a viscosity of 5000-10000 CPS.

8. A method for preparing a ceramicized silica foam aerogel sheet, characterized in that: The following steps are involved: S1: 10-30 parts of aerogel powder, 20-30 parts of aluminum hydroxide, 30-50 parts of hydroxy silicone oil, 100 parts of organosiloxane, 0.1-0.5 parts of catalyst. 1-5 parts of color paste are mixed and added into a kneader for kneading and stirring at a meshing speed of 50-100 rpm for 2-3 hours to obtain a toned mixture A, which is then put into a container for standby use; S2: 20-30 parts of glass powder, 10-30 parts of one or a mixture of calcium silicate / mica powder / kaolin / wollastonite, and 20-30 parts of hydrogen-containing silicone oil are mixed and added into a kneader for kneading and stirring at a speed of 50-100 rpm for 2-3 hours to obtain a milky white mixture B, which is put into a container for standby use; S3: The mixtures A and B obtained above are charged into a mixer and mixed in a ratio of 2:1 to obtain a mixture C; S4: The mixture is coated on a Teflon release film and subjected to a high temperature of 100-150 degrees for 60 minutes to obtain a silicone foam aerogel sheet.