Nano-silica aerogel glass fiber felt and its preparation method

Abstract

The present invention discloses a nano-silica aerogel glass fiber felt and a preparation method thereof. The nano-silica aerogel glass fiber felt is obtained by treating a glass fiber felt with a sizing agent and then laminating it with nano-silica aerogel. The nano-silica aerogel layer is formed by coating nano-silica aerogel on the surface of the glass fiber felt and then curing it. The nano-silica aerogel glass fiber felt prepared by the present invention combines a glass fiber felt and an aerogel through a three-layer and two-layer structure composite. The formed composite structure not only has excellent heat insulation and heat preservation performance, but also has excellent sound insulation and noise reduction performance. When applied to an environment with noise reduction requirements, it can greatly reduce the noise volume.

Description

Technical Field

[0001] The present invention belongs to the technical field of glass fiber mats, in particular to nano-silica aerogel glass fiber mats and their preparation methods. Background Art

[0002] Glass fiber mats, as a kind of thin sheet products formed by continuously oriented or chopped primary filaments combined by chemical binders or mechanical action, have become an indispensable important material in modern industry by virtue of their excellent properties and wide application fields.

[0003] The production processes of glass fiber mats mainly include two types: centrifugal spraying process and flame spraying process. In the centrifugal spraying process, the high-temperature molten glass liquid is evenly distributed on the inner surface of the centrifuge, and a uniform liquid film is formed by centrifugal force. After stretching and separating and spraying the binder, it is cured and dried. The glass fibers produced by this process have a relatively large diameter but are characterized by high energy consumption. The flame spraying process is relatively simple and requires less investment. It uses a high-speed high-temperature flame gas stream to further melt and separate the primary glass fibers, prepares glass fibers with a smaller diameter, and collects and cures them into a mat under the action of the spraying gas stream.

[0004] Glass fiber mats are widely used in the following fields:

[0005] 1. Construction industry, 2. Automobile industry, 3. Shipbuilding industry, 4. Electrical industry, 5. Packaging industry.

[0006] With the continuous progress of technology and the increasing requirements for the performance of glass fiber mats, especially when used in environments with noise reduction requirements, higher performance requirements are put forward for glass fiber mats.

[0007] Therefore, the present invention provides nano-silica aerogel glass fiber mats to solve the corresponding problems. Summary of the Invention

[0008] The purpose of the present invention is to provide nano-silica aerogel glass fiber mats to solve the deficiencies in the prior art.

[0009] The technical solution adopted by the present invention is as follows:

[0010] Nano-silica aerogel glass fiber mats, which are obtained by treating a glass fiber mat with a sizing agent and then laminating it with nano-silica aerogel;

[0011] Among them, the mixing ratio of the glass fiber mat to the sizing agent is 1:10 - 12;

[0012] The nano-silica aerogel layer is formed by coating nano-silica aerogel on the surface of the glass fiber mat and then curing it.

[0013] As a further technical solution: the thickness of the glass fiber mat layer is 0.2 - 0.3 mm; the thickness of the nano-silica aerogel layer is 0.1 - 0.2 mm.

[0014] As a further technical solution: the preparation method of the sizing agent is as follows:

[0015] Add deionized water and a composite emulsifier into the reaction kettle, and stir and mix for 15 min;

[0016] Add methyl methacrylate and isooctyl acrylate into the reaction kettle, adjust the temperature to 50 °C, keep warm, and stir for 30 min;

[0017] Mix lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water in sequence, and carry out high-speed stirring for 10 min to obtain a composite liquid;

[0018] Add the initiator to water to prepare an initiator solution;

[0019] Add the initiator solution to the composite liquid, and stir for 10 min to obtain a mixed liquid;

[0020] Drop the mixed liquid into the reaction kettle according to a volume ratio of 1:3, adjust the temperature to 80 °C, keep warm and stir for 4 hours, and then cool to room temperature to obtain the sizing agent.

[0021] As a further technical solution: the composite emulsifier is composed of alkylphenol polyoxyethylene ether and sodium dodecyl sulfate;

[0022] The mixing mass ratio of the alkylphenol polyoxyethylene ether and sodium dodecyl sulfate is 3:1 - 1.2;

[0023] The mixing mass ratio of the composite emulsifier and deionized water is 1:28.

[0024] As a further technical solution: the mixing mass ratio of methyl methacrylate and isooctyl acrylate is 2:1;

[0025] The mixing mass ratio of methyl methacrylate and the composite emulsifier is 42 - 45:1;

[0026] The mixing mass ratio of lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water is 10 - 14:1:3:30.

[0027] As a further technical solution: the mass fraction of the initiator solution is 3%;

[0028] The initiator is ammonium persulfate;

[0029] The mixing mass ratio of the initiator solution and the composite liquid is 1:40.

[0030] As a further technical solution: the preparation method of the nano-silica aerogel is as follows:

[0031] First, add deionized water, acetic acid and cetyltrimethylammonium bromide to the reaction kettle, stir for 15 min, and then perform ultrasonic dispersion for 10 min to obtain a mixed solution;

[0032] Among them, the stirring speed is 500 r / min;

[0033] Among them, the mass ratio of deionized water, acetic acid and cetyltrimethylammonium bromide is 55:6:2;

[0034] The molar ratio of the methyltriethoxysilane and diethoxydimethylsilane is 1:2;

[0035] Add methyltriethoxysilane and diethoxydimethylsilane to the mixed solution in sequence, adjust the temperature to 40 °C, keep warm and stir for 2 hours, and then add silica sol and continue to stir for 20 min to obtain.

[0036] As a further technical solution: the mass ratio of the deionized water and methyltriethoxysilane is 45:10;

[0037] The volume ratio of the deionized water and silica sol is 10:1;

[0038] Among them, the rotation speed for heat preservation and stirring is 250 r / min.

[0039] As a further technical solution: the nano-silica aerogel glass fiber mat comprises at least 3 layers of glass fiber mat layers and at least 2 layers of nano-silica aerogel layers.

[0040] The preparation method of the nano-silica aerogel glass fiber mat includes the following steps:

[0041] (1) Prepare a substrate: glass fiber mat;

[0042] (2) Prepare nano-silica aerogel;

[0043] (3) Coating:

[0044] Uniformly coat the nano-silica aerogel on the surface of the glass fiber mat, then cover it with a layer of glass fiber mat, and then repeat coating a layer of nano-silica aerogel on the surface of the new glass fiber mat, and then cover it with a layer of glass fiber mat to obtain a preliminary sample;

[0045] (4) Hot pressing and curing:

[0046] The obtained preliminary specimen is placed at a temperature of 60 - 65 °C and hot-pressed for 1 hour, where the hot-pressing pressure is 0.12 MPa;

[0047] (5) Aging:

[0048] After hot-pressing, it is then aged in an air atmosphere at 55 °C for 3 days to obtain the product.

[0049] Beneficial effects:

[0050] Properties:

[0051] The nano-silica aerogel glass fiber felt prepared by the present invention is compounded together through a structure of 3 layers and 2 layers of glass fiber felt and aerogel. The formed composite structure not only has excellent heat insulation and heat preservation performance, but also has excellent sound insulation and noise reduction performance. When applied to an environment with noise reduction requirements, it can significantly reduce the noise volume. Moreover, the nano-silica aerogel glass fiber felt prepared by the present invention also has excellent fireproof and flame-retardant properties.

[0052] By impregnating the glass fiber with an impregnating agent and then combining it with the aerogel layer, the present invention greatly improves the bonding strength between the two. When sound waves invade the nano-silica aerogel glass fiber felt, the sound waves will generate friction and cyclic rebound effects with the fibers, pores, etc. inside the nano-silica aerogel glass fiber felt, so that a large amount of sound waves are absorbed, thus achieving a significant noise reduction effect.

[0053] Since the glass fiber felt can withstand high temperatures, has good mechanical properties and high chemical stability, and is an excellent insulating material, the nano-silica aerogel glass fiber felt prepared by the present invention can be applied in the electrical field as an insulating material.

[0054] The nano-silica aerogel glass fiber felt prepared by the present invention adopts a multi-layer composite structure and contains fixed air cavities inside. Relying on the ultra-high tensile strength of the glass fiber felt substrate and the excellent elastic effect of the aerogel layer, it can better resist impact and vibration.

[0055] Compared with other materials, the nano-silica aerogel glass fiber felt prepared by the present invention has a small density, is light in weight and soft in texture, and can be applied to a variety of composite occasions. Description of the drawings

[0056] Figure 1 It is a structural diagram of the nano-silica aerogel glass fiber felt;

[0057] Among them, 1 is the glass fiber felt layer, and 2 is the nano-silica aerogel layer. Specific embodiments

[0058] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0059] The following are specific embodiments

[0060] Embodiment 1

[0061] A nano-silica aerogel glass fiber felt, which is obtained by treating a glass fiber felt with a sizing agent and then laminating it with a nano-silica aerogel;

[0062] Wherein, the mixing ratio of the glass fiber felt to the sizing agent is 1:10;

[0063] The nano-silica aerogel layer is formed by coating and curing nano-silica aerogel on the surface of the glass fiber felt.

[0064] The thickness of the glass fiber felt layer is 2 mm; the thickness of the nano-silica aerogel layer is 1 mm.

[0065] The preparation method of the sizing agent is as follows:

[0066] Add deionized water and a composite emulsifier into the reaction kettle, and stir and mix for 15 min;

[0067] Add methyl methacrylate and isooctyl acrylate into the reaction kettle, adjust the temperature to 50 °C, keep warm, and stir for 30 min;

[0068] Mix lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water in sequence, and perform high-speed stirring for 10 min to obtain a composite liquid;

[0069] Add the initiator to water to prepare an initiator solution;

[0070] Add the initiator solution to the composite liquid, and stir for 10 min to obtain a mixed liquid;

[0071] Drop the mixed liquid into the reaction kettle according to a volume ratio of 1:3, adjust the temperature to 80 °C, keep warm and stir for 4 hours, and then cool to room temperature to obtain the sizing agent.

[0072] The composite emulsifier is composed of alkylphenol polyoxyethylene ether and sodium dodecyl sulfate;

[0073] The mixing mass ratio of the alkylphenol polyoxyethylene ether and sodium dodecyl sulfate is 3:1;

[0074] The mass ratio of the composite emulsifier to deionized water in the mixture is 1:28.

[0075] The mass ratio of methyl methacrylate to isooctyl acrylate in the mixture is 2:1;

[0076] The mass ratio of methyl methacrylate to the composite emulsifier is 42:1;

[0077] The mass ratio of lauryl acrylate, sodium dodecyl sulfate, castor oil to deionized water in the mixture is 10:1:3:30.

[0078] The mass fraction of the initiator solution is 3%;

[0079] The initiator is ammonium persulfate;

[0080] The mass ratio of the initiator solution to the composite liquid in the mixture is 1:40.

[0081] The preparation method of nano-silica aerogel is as follows:

[0082] First, add deionized water, acetic acid and cetyltrimethylammonium bromide to the reaction kettle, stir for 15 min, and then perform ultrasonic dispersion for 10 min to obtain a mixed liquid;

[0083] Among them, the stirring speed is 500 r / min;

[0084] The mass ratio of deionized water, acetic acid and cetyltrimethylammonium bromide in the mixture is 55:6:2;

[0085] The molar ratio of methyltriethoxysilane to diethoxydimethylsilane is 1:2;

[0086] Add methyltriethoxysilane and diethoxydimethylsilane to the mixed liquid in sequence, adjust the temperature to 40 °C, keep stirring for 2 hours, and then add silica sol and continue stirring for 20 min to obtain.

[0087] The mass ratio of deionized water to methyltriethoxysilane in the mixture is 45:10;

[0088] The volume ratio of deionized water to silica sol is 10:1;

[0089] Among them, the stirring speed during heat preservation is 250 r / min.

[0090] The nano-silica aerogel glass fiber felt contains 3 layers of glass fiber felt layers and 2 layers of nano-silica aerogel layers.

[0091] The preparation method of the nano-silica aerogel glass fiber felt includes the following steps:

[0092] (1) Prepare the substrate: glass fiber felt;

[0093] (2) Prepare nano - silica aerogel;

[0094] (3) Coating:

[0095] Uniformly coat the nano - silica aerogel on the surface of the glass fiber mat, then cover it with another layer of glass fiber mat, and repeat the process of coating a layer of nano - silica aerogel on the surface of the new glass fiber mat and then covering it with another layer of glass fiber mat to obtain a preliminary sample;

[0096] (4) Hot - pressing and curing:

[0097] Place the obtained preliminary sample at a temperature of 60 °C and conduct hot - pressing for 1 hour, where the hot - pressing pressure is 0.12 MPa;

[0098] (5) Aging:

[0099] After hot - pressing, conduct aging treatment for 3 days in an air atmosphere at 55 °C to obtain the product.

[0100] Example 2

[0101] The nano - silica aerogel glass fiber mat is obtained by treating the glass fiber mat with a sizing agent and then laminating it with the nano - silica aerogel;

[0102] Among them, the mixing ratio of the glass fiber mat to the sizing agent is 1:11;

[0103] The nano - silica aerogel layer is formed by coating and curing the nano - silica aerogel on the surface of the glass fiber mat.

[0104] The thickness of the glass fiber mat layer is 2 mm; the thickness of the nano - silica aerogel layer is 1 mm.

[0105] The preparation method of the sizing agent is as follows:

[0106] Add deionized water and a composite emulsifier into the reaction kettle and stir - mix for 15 min;

[0107] Add methyl methacrylate and isooctyl acrylate into the reaction kettle, adjust the temperature to 50 °C, keep warm, and stir for 30 min;

[0108] Mix lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water in sequence, and conduct high - speed stirring for 10 min to obtain a composite liquid;

[0109] Add the initiator into water to prepare an initiator solution;

[0110] Add the initiator solution into the composite liquid and stir for 10 min to obtain a mixed liquid;

[0111] Add the mixed liquid to the reaction kettle according to a volume ratio of 1:3, adjust the temperature to 80 °C, keep warm and stir for 4 hours, and then cool to room temperature to obtain the sizing agent.

[0112] The composite emulsifier is composed of alkylphenol polyoxyethylene ether and sodium dodecyl sulfate;

[0113] The mixing mass ratio of the alkylphenol polyoxyethylene ether and sodium dodecyl sulfate is 3:1.2;

[0114] The mixing mass ratio of the composite emulsifier and deionized water is 1:28.

[0115] The mixing mass ratio of methyl methacrylate and isooctyl acrylate is 2:1;

[0116] The mixing mass ratio of the methyl methacrylate and the composite emulsifier is 45:1;

[0117] The mixing mass ratio of lauryl acrylate, sodium dodecyl sulfate, castor oil and deionized water is 12:1:3:30.

[0118] The mass fraction of the initiator solution is 3%;

[0119] The initiator is ammonium persulfate;

[0120] The mixing mass ratio of the initiator solution and the composite liquid is 1:40.

[0121] The preparation method of nano-silica aerogel is as follows:

[0122] First, add deionized water, acetic acid and cetyltrimethylammonium bromide to the reaction kettle, stir for 15 min, and then perform ultrasonic dispersion for 10 min to obtain a mixed liquid;

[0123] Among them, the stirring speed is 500 r / min;

[0124] Among them, the mixing mass ratio of deionized water, acetic acid and cetyltrimethylammonium bromide is 55:6:2;

[0125] The molar ratio of methyltriethoxysilane and diethoxydimethylsilane is 1:2;

[0126] Add methyltriethoxysilane and diethoxydimethylsilane to the mixed liquid in sequence, adjust the temperature to 40 °C, keep warm and stir for 2 hours, and then add silica sol and continue to stir for 20 min to obtain.

[0127] The mixing mass ratio of deionized water and methyltriethoxysilane is 45:10;

[0128] The volume ratio of the deionized water and the silica sol is 10:1;

[0129] Among them, the heat preservation stirring speed is 250 r / min.

[0130] The nano-silica aerogel glass fiber felt contains 3 layers of glass fiber felt layers and 2 layers of nano-silica aerogel layers.

[0131] The preparation method of the nano-silica aerogel glass fiber felt includes the following steps:

[0132] (1) Prepare the substrate: glass fiber felt;

[0133] (2) Prepare nano-silica aerogel;

[0134] (3) Coating:

[0135] Uniformly coat the nano-silica aerogel on the surface of the glass fiber felt, then cover it with another layer of glass fiber felt, and repeat coating a layer of nano-silica aerogel on the surface of the new glass fiber felt, and then cover it with another layer of glass fiber felt to obtain a preliminary sample;

[0136] (4) Hot pressing and curing:

[0137] Place the obtained preliminary sample at a temperature of 62 °C and carry out hot pressing for 1 hour. Among them, the hot pressing pressure is 0.12 MPa;

[0138] (5) Aging:

[0139] After hot pressing, carry out aging treatment for 3 days in an air atmosphere at 55 °C to obtain the product.

[0140] Example 3

[0141] The nano-silica aerogel glass fiber felt is obtained by treating the glass fiber felt with a sizing agent and then laminating it with the nano-silica aerogel;

[0142] Among them, the mixing ratio of the glass fiber felt to the sizing agent is 1:11;

[0143] The nano-silica aerogel layer is formed by coating and curing the nano-silica aerogel on the surface of the glass fiber felt.

[0144] The thickness of the glass fiber felt layer is 2 mm; the thickness of the nano-silica aerogel layer is 1 mm.

[0145] The preparation method of the sizing agent is as follows:

[0146] Add deionized water and a composite emulsifier into the reaction kettle and stir and mix for 15 min;

[0147] Add methyl methacrylate and isooctyl acrylate into the reaction kettle, adjust the temperature to 50 °C, keep the temperature, and stir for 30 min;

[0148] Mix lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water in sequence, and obtain a composite liquid after high-speed stirring for 10 min;

[0149] Add the initiator to water to prepare an initiator solution;

[0150] Add the initiator solution to the composite liquid, and obtain a mixed liquid after stirring for 10 min;

[0151] Drop the mixed liquid into the reaction kettle according to a volume ratio of 1:3, adjust the temperature to 80 °C, keep the temperature and stir for 4 hours, and then cool to room temperature to obtain a sizing agent.

[0152] The composite emulsifier is composed of alkylphenol polyoxyethylene ether and sodium dodecyl sulfate;

[0153] The mixing mass ratio of the alkylphenol polyoxyethylene ether and sodium dodecyl sulfate is 3:1;

[0154] The mixing mass ratio of the composite emulsifier and deionized water is 1:28.

[0155] The mixing mass ratio of methyl methacrylate and isooctyl acrylate is 2:1;

[0156] The mixing mass ratio of the methyl methacrylate and the composite emulsifier is 42:1;

[0157] The mixing mass ratio of lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water is 11:1:3:30.

[0158] The mass fraction of the initiator solution is 3%;

[0159] The initiator is ammonium persulfate;

[0160] The mixing mass ratio of the initiator solution and the composite liquid is 1:40.

[0161] The preparation method of nano-silica aerogel is as follows:

[0162] First, add deionized water, acetic acid, and cetyltrimethylammonium bromide into the reaction kettle, stir for 15 min, and then perform ultrasonic dispersion for 10 min to obtain a mixed liquid;

[0163] Among them, the stirring speed is 500 r / min;

[0164] Among them, the mixing mass ratio of deionized water, acetic acid, and cetyltrimethylammonium bromide is 55:6:2;

[0165] The molar ratio of methyltriethoxysilane to diethoxydimethylsilane is 1:2;

[0166] Methyltriethoxysilane and diethoxydimethylsilane are successively added to the mixed solution, the temperature is adjusted to 40 °C, and it is kept warm and stirred for 2 hours, and then silica sol is added, and stirring is continued for 20 min to obtain.

[0167] The mass ratio of deionized water to methyltriethoxysilane is 45:10;

[0168] The volume ratio of deionized water to silica sol is 10:1;

[0169] Among them, the rotation speed of heat preservation stirring is 250 r / min.

[0170] The nano-silica aerogel glass fiber felt contains 3 layers of glass fiber felt layers and 2 layers of nano-silica aerogel layers.

[0171] A preparation method of nano-silica aerogel glass fiber felt includes the following steps:

[0172] (1) Prepare the substrate: glass fiber felt;

[0173] (2) Prepare nano-silica aerogel;

[0174] (3) Coating:

[0175] The nano-silica aerogel is uniformly coated on the surface of the glass fiber felt, and then a layer of glass fiber felt is covered, and then a layer of nano-silica aerogel is repeatedly coated on the surface of the new glass fiber felt, and then a layer of glass fiber felt is covered to obtain a preliminary sample;

[0176] (4) Hot pressing and curing:

[0177] The obtained preliminary sample is placed at a temperature of 64 °C and hot pressed for 1 hour, wherein the hot pressing pressure is 0.12 MPa;

[0178] (5) Aging:

[0179] After hot pressing, it is aged in an air atmosphere at 55 °C for 3 days to obtain.

[0180] Example 4

[0181] The nano-silica aerogel glass fiber felt is obtained by treating the glass fiber felt with a sizing agent and then laminating it with a nano-silica aerogel layer;

[0182] Among them, the mixing ratio of the glass fiber felt to the sizing agent is 1:11;

[0183] The nano-silica aerogel layer is formed by coating nano-silica aerogel on the surface of a glass fiber felt and then curing it.

[0184] The thickness of the glass fiber felt layer is 2 mm; the thickness of the nano-silica aerogel layer is 1 mm.

[0185] The preparation method of the sizing agent is as follows:

[0186] Add deionized water and a composite emulsifier into the reaction kettle, and stir and mix for 15 min;

[0187] Add methyl methacrylate and isooctyl acrylate into the reaction kettle, adjust the temperature to 50 °C, keep warm, and stir for 30 min;

[0188] Mix lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water in sequence, and perform high-speed stirring for 10 min to obtain a composite liquid;

[0189] Add the initiator to water to prepare an initiator solution;

[0190] Add the initiator solution to the composite liquid, and stir for 10 min to obtain a mixed liquid;

[0191] Drop the mixed liquid into the reaction kettle according to a volume ratio of 1:3, adjust the temperature to 80 °C, keep warm and stir for 4 hours, and then cool to room temperature to obtain the sizing agent.

[0192] The composite emulsifier is composed of alkylphenol polyoxyethylene ether and sodium dodecyl sulfate;

[0193] The mixing mass ratio of the alkylphenol polyoxyethylene ether and sodium dodecyl sulfate is 3:1.1;

[0194] The mixing mass ratio of the composite emulsifier and deionized water is 1:28.

[0195] The mixing mass ratio of methyl methacrylate and isooctyl acrylate is 2:1;

[0196] The mass ratio of the methyl methacrylate to the composite emulsifier is 44:1;

[0197] The mixing mass ratio of lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water is 13:1:3:30.

[0198] The mass fraction of the initiator solution is 3%;

[0199] The initiator is ammonium persulfate;

[0200] The mixing mass ratio of the initiator solution and the composite liquid is 1:40.

[0201] The preparation method of the nano-silica aerogel is as follows:

[0202] First, add deionized water, acetic acid, and cetyltrimethylammonium bromide to the reaction kettle. After stirring for 15 minutes, then perform ultrasonic dispersion for 10 minutes to obtain a mixed solution;

[0203] Among them, the stirring speed is 500 r / min;

[0204] Among them, the mass ratio of deionized water, acetic acid, and cetyltrimethylammonium bromide in the mixture is 55:6:2;

[0205] The molar ratio of the methyltriethoxysilane and diethoxydimethylsilane is 1:2;

[0206] Add methyltriethoxysilane and diethoxydimethylsilane to the mixed solution in sequence, adjust the temperature to 40 °C, keep warm and stir for 2 hours, then add silica sol and continue to stir for 20 minutes to obtain.

[0207] The mass ratio of deionized water and methyltriethoxysilane in the mixture is 45:10;

[0208] The volume ratio of the deionized water and silica sol is 10:1;

[0209] Among them, the stirring speed during heat preservation is 250 r / min.

[0210] The nano-silica aerogel glass fiber mat contains 3 layers of glass fiber mat layers and 2 layers of nano-silica aerogel layers.

[0211] A preparation method of a nano-silica aerogel glass fiber mat, comprising the following steps:

[0212] (1) Prepare a substrate: glass fiber mat;

[0213] (2) Prepare nano-silica aerogel;

[0214] (3) Coating:

[0215] Uniformly coat the nano-silica aerogel on the surface of the glass fiber mat, then cover it with a layer of glass fiber mat, and then repeat coating a layer of nano-silica aerogel on the surface of the new glass fiber mat, and then cover it with a layer of glass fiber mat to obtain a preliminary sample;

[0216] (4) Hot pressing and curing:

[0217] Place the obtained preliminary sample at a temperature of 62 °C and perform hot pressing for 1 hour, wherein the hot pressing pressure is 0.12 MPa;

[0218] (5) Aging:

[0219] After hot pressing, it is then aged in an air atmosphere at 55 °C for 3 days to obtain the product.

[0220] Example 5

[0221] A nano-silica aerogel glass fiber felt, which is obtained by laminating a glass fiber felt with a nano-silica aerogel after the glass fiber felt is treated with a sizing agent.

[0222] Among them, the mixing ratio of the glass fiber felt to the sizing agent is 1:12.

[0223] The nano-silica aerogel layer is formed by coating and curing nano-silica aerogel on the surface of the glass fiber felt.

[0224] The thickness of the glass fiber felt layer is 2 mm; the thickness of the nano-silica aerogel layer is 1 mm.

[0225] The preparation method of the sizing agent is as follows:

[0226] Add deionized water and a composite emulsifier into the reaction kettle and stir and mix for 15 min.

[0227] Add methyl methacrylate and isooctyl acrylate into the reaction kettle, adjust the temperature to 50 °C, keep warm and stir for 30 min.

[0228] Mix lauryl acrylate, sodium dodecyl sulfate, castor oil and deionized water in sequence, and obtain a composite liquid after high-speed stirring for 10 min.

[0229] Add the initiator into water to prepare an initiator solution.

[0230] Add the initiator solution into the composite liquid and stir for 10 min to obtain a mixed liquid.

[0231] Drop the mixed liquid into the reaction kettle according to a volume ratio of 1:3, adjust the temperature to 80 °C, keep warm and stir for 4 hours, and then cool to room temperature to obtain the sizing agent.

[0232] The composite emulsifier is composed of alkylphenol polyoxyethylene ether and sodium dodecyl sulfate mixed.

[0233] The mixing mass ratio of the alkylphenol polyoxyethylene ether and sodium dodecyl sulfate is 3:1.2.

[0234] The mixing mass ratio of the composite emulsifier to deionized water is 1:28.

[0235] The mixing mass ratio of methyl methacrylate and isooctyl acrylate is 2:1.

[0236] The mass ratio of the methyl methacrylate to the composite emulsifier is 45:1.

[0237] The mixing mass ratio of lauryl acrylate, sodium dodecyl sulfate, castor oil and deionized water is 14:1:3:30.

[0238] The mass fraction of the initiator solution is 3%;

[0239] The initiator is ammonium persulfate;

[0240] The mixing mass ratio of the initiator solution and the composite liquid is 1:40.

[0241] The preparation method of nano-silica aerogel is as follows:

[0242] First, add deionized water, acetic acid and cetyltrimethylammonium bromide to the reaction kettle, stir for 15 min, and then perform ultrasonic dispersion for 10 min to obtain a mixed liquid;

[0243] Among them, the stirring speed is 500 r / min;

[0244] The mixing mass ratio of deionized water, acetic acid and cetyltrimethylammonium bromide is 55:6:2;

[0245] The molar ratio of methyltriethoxysilane and diethoxydimethylsilane is 1:2;

[0246] Add methyltriethoxysilane and diethoxydimethylsilane to the mixed liquid in sequence, adjust the temperature to 40 °C, keep warm and stir for 2 hours, and then add silica sol and continue to stir for 20 min to obtain.

[0247] The mixing mass ratio of deionized water and methyltriethoxysilane is 45:10;

[0248] The volume ratio of deionized water and silica sol is 10:1;

[0249] Among them, the rotation speed for keeping warm and stirring is 250 r / min.

[0250] The nano-silica aerogel glass fiber felt contains 3 layers of glass fiber felt layers and 2 layers of nano-silica aerogel layers.

[0251] The preparation method of the nano-silica aerogel glass fiber felt includes the following steps:

[0252] (1) Prepare the substrate: glass fiber felt;

[0253] (2) Prepare nano-silica aerogel;

[0254] (3) Coating:

[0255] The nano-silica aerogel is uniformly coated on the surface of the fiberglass mat, and then another layer of fiberglass mat is covered. Then, the process of coating a layer of nano-silica aerogel on the surface of the new fiberglass mat and then covering it with another layer of fiberglass mat is repeated to obtain a preliminary sample;

[0256] (4) Hot pressing and curing:

[0257] The obtained preliminary sample is placed at a temperature of 65 °C and hot pressed for 1 hour, where the hot pressing pressure is 0.12 MPa;

[0258] (5) Aging:

[0259] After hot pressing, it is aged in an air atmosphere at 55 °C for 3 days to obtain the product.

[0260] Comparative Example 1:

[0261] On the basis of the technical solution of Example 1, it is not treated with a sizing agent, and the other technical solutions remain unchanged.

[0262] Test:

[0263] The sound insulation performance of the samples of the example and the comparative example is detected, and it is carried out according to the standard of GB / Z22764-2011:

[0264] The test frequency is 4000 Hz;

[0265] 10 samples are measured in sequence for each group, and the average value is taken;

[0266] Table 1

[0267] Maximum sound insulation dB Example 1 16.32 Example 2 16.83 Example 3 16.57 Example 4 16.29 Example 5 16.78 Comparative Example 1 13.07

[0268] As can be seen from Table 1, the nano-silica aerogel fiberglass mat prepared by the present invention has excellent sound insulation performance.

[0269] Taking Example 1 as the basic sample, the influence of the sound insulation performance at different frequencies is compared. 5 samples are measured in sequence for each group, and the average value is taken. The results are shown in Table 2:

[0270] Table 2

[0271] Frequency Hz Maximum sound insulation dB 500 10.24 1000 12.17 2000 14.36 3000 15.87 4000 16.32 5000 16.88 6000 17.25

[0272] As can be seen from Table 2, with the increase of the frequency, the maximum sound insulation amount of the nano-silica aerogel fiberglass mat prepared by the present invention continuously increases.

[0273] The water absorption rates of each group of the example and the comparative example are detected:

[0274] Table 3

[0275]

[0276]

[0277] As can be seen from Table 3, the water absorption rate of the nano-silica aerogel glass fiber felt prepared by the present invention is relatively low and it is not easy to absorb water.

[0278] The above are only the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments shown. Any changes made according to the concept of the present invention, or equivalent embodiments modified into equivalent changes, still within the spirit covered by the specification, shall be within the protection scope of the present invention.

Claims

1. Nano-silica aerogel glass fiber felt, characterized in that, The nano-silica aerogel glass fiber felt is obtained by treating a glass fiber felt with a sizing agent and then laminating it with nano-silica aerogel; the nano-silica aerogel glass fiber felt contains at least 3 layers of glass fiber felt layers and at least 2 layers of nano-silica aerogel layers; Among them, the mixing ratio of the glass fiber felt to the sizing agent is 1:10 - 12; The nano-silica aerogel layer is formed by coating nano-silica aerogel on the surface of the glass fiber felt and then curing it; The preparation method of the sizing agent is as follows: Add deionized water and a composite emulsifier into the reaction kettle, and stir and mix for 15 minutes; the composite emulsifier is a mixture of alkylphenol polyoxyethylene ether and sodium dodecyl sulfate in a mass ratio of 3:1 - 1.2; the mixing mass ratio of the composite emulsifier to deionized water is 1:28; Add methyl methacrylate and isooctyl acrylate into the reaction kettle, adjust the temperature to 50 °C, keep warm, and stir for 30 minutes; Mix lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water in sequence, and perform high-speed stirring for 10 minutes to obtain a composite liquid; Add the initiator to water to prepare an initiator solution; Add the initiator solution to the composite liquid, and stir for 10 minutes to obtain a mixed liquid; Drop the mixed liquid into the reaction kettle according to a volume ratio of 1:3, adjust the temperature to 80 °C, keep warm and stir for 4 hours, and then cool to room temperature to obtain the sizing agent.

2. The nano-silica aerogel glass fiber felt according to claim 1, wherein: The thickness of the glass fiber felt layer is 0.2 - 0.3 mm; the thickness of the nano-silica aerogel layer is 0.1 - 0.2 mm.

3. The nano-silica aerogel glass fiber felt according to claim 1, wherein: The mixing mass ratio of methyl methacrylate and isooctyl acrylate is 2:1; The mixing mass ratio of methyl methacrylate and the composite emulsifier is 42 - 45:1; The mixing mass ratio of lauryl acrylate, sodium dodecyl sulfate, castor oil, and deionized water is 10 - 14:1:3:

30.

4. The nano-silica aerogel glass fiber felt according to claim 3, characterized in that: The mass fraction of the initiator solution is 3%; The initiator is ammonium persulfate; The mixing mass ratio of the initiator solution to the composite liquid is 1:

40.

5. The nano-silica aerogel glass fiber felt according to claim 1, characterized in that: The preparation method of the nano-silica aerogel is as follows: First, add deionized water, acetic acid, and cetyltrimethylammonium bromide into the reaction kettle, stir for 15 minutes, and then perform ultrasonic dispersion for 10 minutes to obtain a mixed liquid; Among them, the stirring speed is 500 r / min; Among them, the mixing mass ratio of deionized water, acetic acid, and cetyltrimethylammonium bromide is 55:6:2; The molar ratio of methyltriethoxysilane and diethoxydimethylsilane is 1:2; Add methyltriethoxysilane and diethoxydimethylsilane to the mixed liquid in sequence, adjust the temperature to 40 °C, keep warm and stir for 2 hours, and then add silica sol and continue to stir for 20 minutes to obtain.

6. The nano-silica aerogel glass fiber felt according to claim 5, characterized in that: The mixing mass ratio of deionized water and methyltriethoxysilane is 45:10; The volume ratio of deionized water to silica sol is 10:1; Among them, the keep-warm stirring speed is 250 r / min.

7. The preparation method of the nano-silica aerogel glass fiber felt according to any one of claims 1-6, characterized in that: It includes the following steps: (1) Prepare the substrate: glass fiber felt; (2) Prepare nano-silica aerogel; (3) Coating: Uniformly coat the surface of the glass fiber mat with nano-silica aerogel, then cover it with another layer of glass fiber mat, and repeat the process of coating a layer of nano-silica aerogel on the surface of the new glass fiber mat and then covering it with another layer of glass fiber mat to obtain a preliminary specimen; (4) Hot pressing and curing: Place the obtained preliminary specimen at a temperature of 60 - 65 °C and conduct hot pressing for 1 hour, where the hot pressing pressure is 0.12 MPa; (5) Aging: After hot pressing, conduct aging treatment for 3 days in an air atmosphere at 55 °C to obtain the product.

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