A low bulk density glass fiber cotton felt and its preparation method

Abstract

The present invention belongs to the technical field of cotton felts, and relates to a low bulk density glass fiber cotton felt and a preparation method thereof. The preparation is as follows: Set the reserved space for the three-layer structure of the glass fiber cotton felt, with modified non-woven fabrics placed in the upper and lower layer structures, and a modified cotton felt placed in the middle layer structure; Laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both side surfaces of the modified cotton felt; Wherein the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5; After the protective agent is dried, penetrate the modified non-woven fabrics into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85 °C for 25-35 min, then it is ready. It is found through testing that this material has excellent noise reduction performance, can meet the noise reduction requirements of the aircraft cabin, and has excellent flame retardant performance, meeting the flame retardant requirements of the cabin.

Description

Technical Field

[0001] The present invention belongs to the technical field of cotton felts, and specifically relates to a low bulk density glass fiber cotton felt and a preparation method thereof. Background Art

[0002] Glass fiber cotton felt is a porous felt-like inorganic material formed by laminating and winding glass fibers and fixed by an adhesive. By collecting, homogenizing, spraying glue, curing, and pressing glass fibers, various types of porous felts such as plates and pipes can be made and used as thermal insulation and sound absorption materials. Compared with organic fibers, it has stable chemical properties, is resistant to acids and alkalis, is not easy to age, has the advantages of high temperature resistance, non-combustibility, good heat insulation and sound insulation performance, and good electrical insulation performance, becoming a substitute for traditional organic fiber materials. Moreover, compared with inorganic thermal insulation materials such as carbon fiber felts and aluminum silicate ceramic fiber felts, glass fiber felts are of small mass, which can reduce the overall weight of the carrier, thereby saving the energy consumption of the carrier. In addition, the cotton felt has a low dust generation rate, is environmentally friendly and pollution-free, and has rich sources of production raw materials and low manufacturing costs. Therefore, it is widely used in the fields of construction, chemical industry, petroleum, shipbuilding, aerospace, etc.

[0003] Chinese Patent No. CN 204249476 U provides a basalt waterproof composite felt, belonging to the field of waterproof materials, including a basalt non-woven thin felt and a basalt mesh cloth. The basalt non-woven thin felt is adhered to the upper part of the basalt mesh cloth through an adhesive. The basalt non-woven thin felt has a fiber diameter of 13μm and a thickness of 3mm - 4mm, presenting a thin felt shape; the basalt mesh cloth is treated with a special resin, and its specification is a surface density of 180g / m 2 -220g / m 2 , and the mesh size is 5×5 meshes. The mechanical properties of this utility model are 30% - 50% higher than those of ordinary organic fiber non-woven fabric substrates. At the same time, basalt fibers have the advantages of being resistant to high temperatures of 650°C and strong heat shrinkage resistance. At the same time, they have better impregnation compatibility with asphalt and are more suitable as the substrate of waterproof materials for pipelines transporting media such as asphalt, petroleum, and natural gas, having extremely high economic value and social benefits. However, the surface density of this basalt waterproof composite felt is relatively large, which is not very convenient in practical applications.

[0004] US Patent US2005 / 0086977A1 discloses a glass fiber manufacturing equipment and preparation method. The glass fiber described in the invention is prepared into centrifugal glass fiber with a diameter of 6.5μm to 7.5μm through the process of melting high-temperature glass liquid of raw materials, homogenizing the material channel, draining the leaking plate, centrifugal drawing of centrifugal disk, and secondary drawing fiberization by burner. The document Platinum / rhodium Alloy Bushing for Drawing Glass Fibers in Centrifugal-spinneret-blowProcess (Precious Metals, 33 (2012) 66-70) proposes that in the process of preparing fibers by centrifugal blowing high-temperature glass liquid, the centrifuge drawing process parameters play a decisive role in the quality of centrifugal glass fiber and the performance of its fiber products. At present, the diameter of domestic centrifugal glass fiber is generally above 7μm, and contains more slag ball impurities. Summary of the invention

[0005] The present invention provides the following technical solutions:

[0006] A method for preparing a low bulk density glass fiber felt comprises the following steps:

[0007] (1) First, a reserved space for a three-layer structure of glass fiber cotton felt is set, wherein the upper and lower layers are placed with modified non-woven fabrics, and the middle layer is placed with modified cotton felt;

[0008] (2) Next, the modified cotton felt is inserted laterally at the position of the intermediate layer structure, and a protective agent is evenly sprayed on both sides of the modified cotton felt; wherein the protective agent is a mixture of benzophenone and polyethylene glycol, and the volume ratio of benzophenone to polyethylene glycol is 3:5;

[0009] (3) Finally, after the protective agent is dried, the modified non-woven fabric is inserted into the upper and lower layers respectively, and a curing machine is used to cure and dry at 85°C for 25-35 minutes.

[0010] The preparation method of the low bulk density glass fiber felt described above,

[0011] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0012] Prepare non-woven fabric raw materials;

[0013] The non-woven fabric raw material and the modifier are mixed at a mass ratio of 1:0.06, transferred to a magnetic stirrer for thorough stirring and mixing, and heated to 85° C. to obtain a molten liquid;

[0014] The molten liquid is vacuum dried at a temperature of 60°C.

[0015] The preparation method of the low bulk density glass fiber cotton felt described above

[0016] Among them, the non-woven fabric raw material, by weight, includes the following components:

[0017] 70 parts - 90 parts of polypropylene

[0018] 15 parts - 25 parts of acrylic acid

[0019] 3 parts - 8 parts of β-acryloyloxypropionic acid;

[0020] Among them, the modifier, by weight, includes the following components:

[0021] 20 parts - 30 parts of dodecyl mercaptan

[0022] 5 parts - 15 parts of absolute ethanol

[0023] 5 parts - 10 parts of maleic anhydride

[0024] The preparation method of the low bulk density glass fiber cotton felt described above

[0025] Among them, the non-woven fabric raw material, by weight, includes the following components:

[0026] 75 parts - 85 parts of polypropylene

[0027] 17 parts - 22 parts of acrylic acid

[0028] 3 parts - 8 parts of β-acryloyloxypropionic acid;

[0029] Among them, the modifier, by weight, includes the following components:

[0030] 25 parts - 30 parts of dodecyl mercaptan

[0031] 5 parts - 15 parts of absolute ethanol

[0032] 5 parts - 10 parts of maleic anhydride

[0033] The preparation method of the low bulk density glass fiber cotton felt described above

[0034] Among them, the non-woven fabric raw material, by weight, includes the following components:

[0035] 80 parts of polypropylene

[0036] 20 parts of acrylic acid

[0037] 5 parts of β-acryloyloxypropionic acid;

[0038] Among them, the modifier, by weight, includes the following components:

[0039] 28 parts of dodecanethiol,

[0040] 10 parts of absolute ethanol,

[0041] 8 parts of maleic anhydride.

[0042] The preparation method of the low bulk density glass fiber cotton felt described above,

[0043] Among them, the preparation method of the modified cotton felt described in step (1) is as follows:

[0044] Prepare the cotton felt raw materials;

[0045] Mix the above-mentioned cotton felt raw materials with the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0046] Carry out ultraviolet curing on the above-mentioned molten liquid, and that's it.

[0047] The preparation method of the low bulk density glass fiber cotton felt described above,

[0048] Among them, the cotton felt raw materials, in parts by weight, include the following components:

[0049] 50 - 70 parts of cotton felt,

[0050] 15 - 25 parts of glass fiber,

[0051] 2 - 6 parts of melamine;

[0052] Among them, the modifier, in parts by weight, includes the following components:

[0053] 10 - 20 parts of calcium oxide,

[0054] 5 - 15 parts of urea,

[0055] 5 - 8 parts of phenol.

[0056] The preparation method of the low bulk density glass fiber cotton felt described above,

[0057] Among them, the cotton felt raw materials, in parts by weight, include the following components:

[0058] 55 - 70 parts of cotton felt,

[0059] 15 - 22 parts of glass fiber,

[0060] 2 - 6 parts of melamine;

[0061] Among them, the modifier, in parts by weight, includes the following components:

[0062] 15 to 20 parts of calcium oxide,

[0063] 5 to 15 parts of urea,

[0064] 5 to 8 parts of phenol.

[0065] The preparation method of the low bulk density glass fiber cotton felt described above,

[0066] Among them, the raw materials of the cotton felt, in parts by weight, include the following components:

[0067] 65 parts of cotton felt,

[0068] 18 parts of glass fiber,

[0069] 4 parts of melamine;

[0070] Among them, the modifier, in parts by weight, includes the following components:

[0071] 18 parts of calcium oxide,

[0072] 12 parts of urea,

[0073] 7 parts of phenol.

[0074] A low bulk density glass fiber cotton felt obtained by the preparation method described above. Beneficial effects

[0075] This application designs a three-component structure of the glass fiber cotton felt, in which a protective agent is designed. The protective agent can achieve the compatibility between the cotton felt and the non-woven fabric, improve the stability between the cotton felt and the non-woven fabric, and meet the use of auxiliary materials for airplanes. At the same time, β-acryloyloxypropionic acid is first applied to the modification treatment of the non-woven fabric to achieve the phase change transformation during the synthesis of the non-woven fabric, reduce the surface free energy, improve the heat insulation and noise reduction effect of the non-woven fabric, and reduce the internal voids of the non-woven fabric, thereby providing overall stability. And dodecyl mercaptan and maleic anhydride further play a comprehensive flame retardant effect; for the cotton felt, the addition of glass fiber can enhance the flame retardant and noise reduction performance, but melamine can interact with calcium oxide particles to form an interpenetrating three-dimensional interlocking network structure. The interlocking structure increases the flow resistance and improves the overall porosity and action strength of the cotton felt. Generally speaking, this material is found to have excellent noise reduction performance through testing, which can meet the noise reduction requirements of the aircraft cabin, and has excellent flame retardant performance, meeting the flame retardant requirements of the cabin. Specific embodiments Example 1

[0076] The preparation method of the low bulk density glass fiber cotton felt includes the following steps:

[0077] (1)First, set aside the space for the three-layer structure of the fiberglass batt. Place the modified non-woven fabric in the upper and lower layers, and place the modified batt in the middle layer;

[0078] (2)Next, laterally insert the modified batt at the position of the middle layer structure, and evenly spray a protective agent on both sides of the modified batt; the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0079] (3)Finally, after the protective agent dries, insert the modified non-woven fabric into the upper and lower layers respectively, and use a curing machine to cure and dry at 85 °C for 25 min, then it is ready.

[0080] The preparation method of the low bulk density fiberglass batt described above,

[0081] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0082] Prepare non-woven fabric raw materials;

[0083] Mix the above non-woven fabric raw materials and the modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer and stir evenly, and heat up to 85 °C to obtain a molten liquid;

[0084] Vacuum dry the above molten liquid, and the drying temperature is 60 °C, then it is ready.

[0085] The preparation method of the low bulk density fiberglass batt described above,

[0086] The non-woven fabric raw materials, by weight, include the following components:

[0087] 70 parts of polypropylene fiber,

[0088] 25 parts of acrylic acid,

[0089] 3 parts of β-acryloyloxypropionic acid;

[0090] The modifier, by weight, includes the following components:

[0091] 20 parts of dodecyl mercaptan,

[0092] 15 parts of absolute ethanol,

[0093] 5 parts of maleic anhydride.

[0094] The preparation method of the low bulk density fiberglass batt described above,

[0095] The preparation method of the modified batt described in step (1) is as follows:

[0096] Prepare the raw materials for the cotton felt;

[0097] Mix the above-mentioned raw materials for the cotton felt with the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0098] Carry out ultraviolet curing on the above-mentioned molten liquid, and that's it.

[0099] The preparation method of the low bulk density glass fiber cotton felt described above,

[0100] Among them, the raw materials for the cotton felt, by weight, include the following components:

[0101] 50 parts of cotton felt,

[0102] 25 parts of glass fiber,

[0103] 2 parts of melamine;

[0104] Among them, the modifier, by weight, includes the following components:

[0105] 10 parts of calcium oxide,

[0106] 15 parts of urea,

[0107] 5 parts of phenol.

[0108] The low bulk density glass fiber cotton felt obtained by the preparation method described above. Example 2

[0109] The preparation method of the low bulk density glass fiber cotton felt includes the following steps:

[0110] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, where the upper and lower layer structures are filled with modified non-woven fabrics, and the middle layer structure is filled with unmodified cotton felt;

[0111] (2) Then, laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both sides of the modified cotton felt; among them, the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0112] (3) Finally, after the protective agent dries, penetrate the modified non-woven fabrics into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85 °C for 35 min, and that's it.

[0113] The preparation method of the low bulk density glass fiber cotton felt described above,

[0114] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0115] Prepare the raw materials for the non-woven fabric;

[0116] Mix the above non-woven fabric raw materials and modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer, stir and mix well, and heat up to 85 °C to obtain a molten liquid;

[0117] Vacuum dry the above molten liquid, where the drying temperature is 60 °C, and that's it.

[0118] The preparation method of the low bulk density glass fiber cotton felt described above,

[0119] Among them, the non-woven fabric raw materials, by weight, include the following components:

[0120] 90 parts of polypropylene fiber,

[0121] 15 parts of acrylic acid,

[0122] 8 parts of β-acryloyloxypropionic acid;

[0123] Among them, the modifier, by weight, includes the following components:

[0124] 30 parts of dodecyl mercaptan,

[0125] 5 parts of absolute ethanol,

[0126] 10 parts of maleic anhydride.

[0127] The preparation method of the low bulk density glass fiber cotton felt described above,

[0128] Among them, the preparation method of the modified cotton felt described in step (1) is as follows:

[0129] Prepare the cotton felt raw materials;

[0130] Mix the above cotton felt raw materials and modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0131] Carry out ultraviolet curing on the above molten liquid, and that's it.

[0132] The preparation method of the low bulk density glass fiber cotton felt described above,

[0133] Among them, the cotton felt raw materials, by weight, include the following components:

[0134] 70 parts of cotton felt,

[0135] 15 parts of glass fiber,

[0136] 6 parts of melamine;

[0137] Among them, the modifier, by weight, includes the following components:

[0138] 20 parts of calcium oxide,

[0139] 5 parts of urea,

[0140] 8 parts of phenol.

[0141] The low bulk density glass fiber cotton felt obtained by the preparation method as described above. Example 3

[0142] A preparation method of a low bulk density glass fiber cotton felt, comprising the following steps:

[0143] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, wherein the upper and lower layer structures are placed with modified non-woven fabrics, and the middle layer structure is placed with a modified cotton felt;

[0144] (2) Then, laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both side surfaces of the modified cotton felt; wherein the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0145] (3) Finally, after the protective agent is dried, penetrate the modified non-woven fabrics into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85 °C for 25 min, then it is ready.

[0146] The preparation method of the low bulk density glass fiber cotton felt as described above,

[0147] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0148] Prepare non-woven fabric raw materials;

[0149] Mix the above non-woven fabric raw materials with a modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer, fully stir and mix them, and heat up to 85 °C to obtain a molten liquid;

[0150] Perform vacuum drying on the above molten liquid, wherein the drying temperature is 60 °C, then it is ready.

[0151] The preparation method of the low bulk density glass fiber cotton felt as described above,

[0152] The non-woven fabric raw materials, in parts by weight, include the following components:

[0153] 75 parts of polypropylene,

[0154] 22 parts of acrylic acid,

[0155] 3 parts of β-acryloyloxypropionic acid;

[0156] The modifier, in parts by weight, includes the following components:

[0157] 25 parts of dodecyl mercaptan,

[0158] 15 parts of absolute ethanol,

[0159] 5 parts of maleic anhydride.

[0160] The preparation method of the low bulk density glass fiber cotton felt described above,

[0161] Among them, the preparation method of the modified cotton felt described in step (1) is as follows:

[0162] Prepare the cotton felt raw materials;

[0163] Mix the above-mentioned cotton felt raw materials with the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir well and uniformly, and heat up to 110 °C to obtain a molten liquid;

[0164] Carry out ultraviolet curing on the above-mentioned molten liquid, and that's it.

[0165] The preparation method of the low bulk density glass fiber cotton felt described above,

[0166] Among them, the cotton felt raw materials, in parts by weight, include the following components:

[0167] 55 parts of cotton felt,

[0168] 22 parts of glass fiber,

[0169] 2 parts of melamine;

[0170] Among them, the modifier, in parts by weight, includes the following components:

[0171] 15 parts of calcium oxide,

[0172] 15 parts of urea,

[0173] 5 parts of phenol.

[0174] The low bulk density glass fiber cotton felt obtained by the preparation method described above. Example 4

[0175] The preparation method of the low bulk density glass fiber cotton felt includes the following steps:

[0176] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, where the upper and lower layer structures are placed with modified non-woven fabrics, and the middle layer structure is placed with modified cotton felt;

[0177] (2) Next, insert the modified cotton felt laterally at the position of the middle layer structure, and evenly spray a protective agent on both side surfaces of the modified cotton felt; wherein the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0178] (3) Finally, after the protective agent dries, insert the modified non-woven fabric into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85°C for 35 minutes, then it is ready.

[0179] The preparation method of the low bulk density glass fiber cotton felt described above,

[0180] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0181] Prepare non-woven fabric raw materials;

[0182] Mix the above non-woven fabric raw materials and the modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer and stir evenly, and heat up to 85°C to obtain a molten liquid;

[0183] Vacuum dry the above molten liquid, where the drying temperature is 60°C, then it is ready.

[0184] The preparation method of the low bulk density glass fiber cotton felt described above,

[0185] The non-woven fabric raw materials described above, by weight, include the following components:

[0186] Polypropylene 85 parts,

[0187] Acrylic acid 17 parts,

[0188] β-Acryloyloxypropionic acid 8 parts;

[0189] The modifier described above, by weight, includes the following components:

[0190] Dodecyl mercaptan 30 parts,

[0191] Absolute ethanol 5 parts,

[0192] Maleic anhydride 10 parts.

[0193] The preparation method of the low bulk density glass fiber cotton felt described above,

[0194] The preparation method of the modified cotton felt described in step (1) is as follows:

[0195] Prepare cotton felt raw materials;

[0196] Mix the above-mentioned cotton felt raw material and the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0197] Subject the above-mentioned molten liquid to ultraviolet curing, and that's it.

[0198] The preparation method of the low bulk density glass fiber cotton felt described above,

[0199] Among them, the cotton felt raw material, by weight, includes the following components:

[0200] 70 parts of cotton felt,

[0201] 15 parts of glass fiber,

[0202] 6 parts of melamine;

[0203] Among them, the modifier, by weight, includes the following components:

[0204] 20 parts of calcium oxide,

[0205] 5 parts of urea,

[0206] 8 parts of phenol.

[0207] The low bulk density glass fiber cotton felt obtained by the preparation method described above. Example 5

[0208] The preparation method of the low bulk density glass fiber cotton felt includes the following steps:

[0209] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, where the modified non-woven fabric is placed in the upper and lower layers, and the modified cotton felt is placed in the middle layer;

[0210] (2) Then, laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both sides of the modified cotton felt; the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0211] (3) Finally, after the protective agent dries, penetrate the modified non-woven fabric into the upper and lower layers respectively, and use a curing machine to cure and dry at 85 °C for 30 min, and that's it.

[0212] The preparation method of the low bulk density glass fiber cotton felt described above,

[0213] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0214] Prepare non-woven fabric raw materials;

[0215] Mix the above non-woven fabric raw materials and the modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer, stir and mix well, and heat up to 85 °C to obtain a molten liquid;

[0216] Vacuum dry the above molten liquid, and the drying temperature is 60 °C, that's all.

[0217] The preparation method of the low bulk density glass fiber cotton felt described above,

[0218] Among them, the non-woven fabric raw materials, by weight, include the following components:

[0219] 80 parts of polypropylene,

[0220] 20 parts of acrylic acid,

[0221] 5 parts of β-acryloyloxypropionic acid;

[0222] Among them, the modifier, by weight, includes the following components:

[0223] 28 parts of dodecyl mercaptan,

[0224] 10 parts of absolute ethanol,

[0225] 8 parts of maleic anhydride.

[0226] The preparation method of the low bulk density glass fiber cotton felt described above,

[0227] Among them, the preparation method of the modified cotton felt described in step (1) is as follows:

[0228] Prepare the cotton felt raw materials;

[0229] Mix the above cotton felt raw materials and the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0230] Carry out ultraviolet curing on the above molten liquid, that's all.

[0231] The preparation method of the low bulk density glass fiber cotton felt described above,

[0232] Among them, the cotton felt raw materials, by weight, include the following components:

[0233] 65 parts of cotton felt,

[0234] 18 parts of glass fiber,

[0235] 4 parts of melamine;

[0236] Among them, the modifier, by weight, includes the following components:

[0237] 18 parts of calcium oxide,

[0238] 12 parts of urea,

[0239] 7 parts of phenol.

[0240] The low bulk density glass fiber cotton felt obtained by the preparation method as described above.

[0241] Comparative Example 1

[0242] A preparation method of a low bulk density glass fiber cotton felt, comprising the following steps:

[0243] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, where the modified non-woven fabric is placed in the upper and lower layers, and the modified cotton felt is placed in the middle layer;

[0244] (2) Then, laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both side surfaces of the modified cotton felt; wherein the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0245] (3) Finally, after the protective agent dries, penetrate the modified non-woven fabric into the upper and lower layers respectively, and use a curing machine to cure and dry at 85 °C for 30 min, then it is ready.

[0246] The preparation method of the low bulk density glass fiber cotton felt as described above,

[0247] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0248] Prepare non-woven fabric raw materials;

[0249] Mix the above non-woven fabric raw materials and a modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer, stir and mix well, and heat up to 85 °C to obtain a molten liquid;

[0250] Perform vacuum drying on the above molten liquid, where the drying temperature is 60 °C, then it is ready.

[0251] The preparation method of the low bulk density glass fiber cotton felt as described above,

[0252] The non-woven fabric raw materials, in parts by weight, include the following components:

[0253] 80 parts of polypropylene,

[0254] 20 parts of acrylic acid;

[0255] The modifier, in parts by weight, includes the following components:

[0256] 28 parts of dodecyl mercaptan,

[0257] 10 parts of absolute ethanol,

[0258] 8 parts of maleic anhydride.

[0259] The preparation method of the low bulk density glass fiber cotton felt described above,

[0260] Among them, the preparation method of the modified cotton felt described in step (1) is as follows:

[0261] Prepare the cotton felt raw materials;

[0262] Mix the above-mentioned cotton felt raw materials with the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0263] Carry out ultraviolet curing on the above-mentioned molten liquid, and that's it.

[0264] The preparation method of the low bulk density glass fiber cotton felt described above,

[0265] Among them, the cotton felt raw materials, in parts by weight, include the following components:

[0266] 65 parts of cotton felt,

[0267] 18 parts of glass fiber,

[0268] 4 parts of melamine;

[0269] Among them, the modifier, in parts by weight, includes the following components:

[0270] 18 parts of calcium oxide,

[0271] 12 parts of urea,

[0272] 7 parts of phenol.

[0273] The low bulk density glass fiber cotton felt obtained by the preparation method described above.

[0274] Comparative Example 2

[0275] The preparation method of the low bulk density glass fiber cotton felt includes the following steps:

[0276] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, where the upper and lower layer structures are placed with modified non-woven fabrics, and the middle layer structure is placed with unmodified cotton felt;

[0277] (2) Then, laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both sides of the modified cotton felt; among them, the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0278] (3) Finally, after the protective agent dries, insert the modified non-woven fabric into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85 °C for 30 min to complete.

[0279] The preparation method of the low bulk density glass fiber cotton felt described above

[0280] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0281] Prepare non-woven fabric raw materials;

[0282] Mix the above non-woven fabric raw materials and the modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer, stir and mix well, and heat up to 85 °C to obtain a molten liquid;

[0283] Vacuum dry the above molten liquid, where the drying temperature is 60 °C to complete.

[0284] The preparation method of the low bulk density glass fiber cotton felt described above

[0285] The non-woven fabric raw materials described therein, in parts by weight, include the following components:

[0286] 80 parts of polypropylene

[0287] 20 parts of acrylic acid

[0288] 5 parts of β-acryloyloxypropionic acid;

[0289] The modifier described therein, in parts by weight, includes the following components:

[0290] 10 parts of absolute ethanol

[0291] 8 parts of maleic anhydride.

[0292] The preparation method of the low bulk density glass fiber cotton felt described above

[0293] The preparation method of the modified cotton felt described in step (1) is as follows:

[0294] Prepare cotton felt raw materials;

[0295] Mix the above cotton felt raw materials and the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0296] Ultraviolet cure the above molten liquid to complete.

[0297] The preparation method of the low bulk density glass fiber cotton felt described above

[0298] The cotton felt raw materials described therein, in parts by weight, include the following components:

[0299] 65 parts of cotton felt,

[0300] 18 parts of glass fiber,

[0301] 4 parts of melamine;

[0302] The modifier described above, by weight, includes the following components:

[0303] 18 parts of calcium oxide,

[0304] 12 parts of urea,

[0305] 7 parts of phenol.

[0306] The low bulk density glass fiber cotton felt obtained by the preparation method described above.

[0307] Comparative Example 3

[0308] A preparation method of low bulk density glass fiber cotton felt, comprising the following steps:

[0309] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, where the upper and lower layer structures are placed with modified non-woven fabrics, and the middle layer structure is placed with unmodified cotton felt;

[0310] (2) Then, laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both side surfaces of the modified cotton felt; the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0311] (3) Finally, after the protective agent is dried, penetrate the modified non-woven fabrics into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85°C for 30 min, then it is ready.

[0312] The preparation method of the low bulk density glass fiber cotton felt described above,

[0313] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0314] Prepare non-woven fabric raw materials;

[0315] Mix the above non-woven fabric raw materials with the modifier at a mass ratio of 1:0.06, transfer them to a magnetic stirrer and stir evenly, and heat up to 85°C to obtain a molten liquid;

[0316] Perform vacuum drying on the above molten liquid, where the drying temperature is 60°C, then it is ready.

[0317] The preparation method of the low bulk density glass fiber cotton felt described above,

[0318] The non-woven fabric raw material described above, by weight, includes the following components:

[0319] 80 parts of polypropylene fiber,

[0320] 20 parts of acrylic acid,

[0321] 5 parts of β-acryloyloxypropionic acid;

[0322] The modifier described above, by weight, includes the following components:

[0323] 28 parts of dodecyl mercaptan,

[0324] 10 parts of absolute ethanol,

[0325] 8 parts of maleic anhydride.

[0326] The preparation method of the low bulk density glass fiber cotton felt described above,

[0327] The preparation method of the modified cotton felt described in step (1) is as follows:

[0328] Prepare the cotton felt raw material;

[0329] Mix the above-mentioned cotton felt raw material and the modifier at a mass ratio of 1:0.02, transfer it to a magnetic stirrer, stir and mix well, and heat up to 110 °C to obtain a molten liquid;

[0330] Carry out ultraviolet curing on the above-mentioned molten liquid, and that's it.

[0331] The preparation method of the low bulk density glass fiber cotton felt described above,

[0332] The cotton felt raw material described above, by weight, includes the following components:

[0333] 65 parts of cotton felt,

[0334] 18 parts of glass fiber;

[0335] The modifier described above, by weight, includes the following components:

[0336] 18 parts of calcium oxide,

[0337] 12 parts of urea,

[0338] 7 parts of phenol.

[0339] The low bulk density glass fiber cotton felt obtained by the preparation method described above.

[0340] Comparative Example 4

[0341] The preparation method of the low bulk density glass fiber cotton felt includes the following steps:

[0342] (1)First, set aside the space for the three-layer structure of the glass fiber cotton felt, with the modified non-woven fabric placed in the upper and lower layers and the modified cotton felt placed in the middle layer;

[0343] (2)Next, laterally insert the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both sides of the modified cotton felt; the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5;

[0344] (3)Finally, after the protective agent dries, insert the modified non-woven fabric into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85 °C for 30 min, then it is ready.

[0345] The preparation method of the low bulk density glass fiber cotton felt described above,

[0346] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0347] Prepare the non-woven fabric raw material;

[0348] Mix the above non-woven fabric raw material and the modifier in a mass ratio of 1:0.06, transfer it to a magnetic stirrer, stir and mix well, and heat up to 85 °C to obtain a molten liquid;

[0349] Vacuum dry the above molten liquid, and the drying temperature is 60 °C, then it is ready.

[0350] The preparation method of the low bulk density glass fiber cotton felt described above,

[0351] The non-woven fabric raw material, by weight, includes the following components:

[0352] 80 parts of polypropylene fiber,

[0353] 20 parts of acrylic acid,

[0354] 5 parts of β-acryloyloxypropionic acid;

[0355] The modifier, by weight, includes the following components:

[0356] 28 parts of dodecyl mercaptan,

[0357] 10 parts of absolute ethanol,

[0358] 8 parts of maleic anhydride.

[0359] The preparation method of the low bulk density glass fiber cotton felt described above,

[0360] The preparation method of the modified cotton felt described in step (1) is as follows:

[0361] Prepare the raw materials for the cotton felt;

[0362] Mix the above-mentioned raw materials for the cotton felt with the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir well and mix evenly, and heat up to 110 °C to obtain a molten liquid;

[0363] Carry out ultraviolet curing on the above-mentioned molten liquid, and that's it.

[0364] The preparation method of the low bulk density glass fiber cotton felt described above,

[0365] Among them, the raw materials for the cotton felt, by weight, include the following components:

[0366] 65 parts of cotton felt,

[0367] 18 parts of glass fiber,

[0368] 4 parts of melamine;

[0369] Among them, the modifier, by weight, includes the following components:

[0370] 18 parts of calcium oxide,

[0371] 7 parts of phenol.

[0372] The low bulk density glass fiber cotton felt obtained by the preparation method described above.

[0373] Comparative Example 5

[0374] The preparation method of the low bulk density glass fiber cotton felt includes the following steps:

[0375] (1) First, set the reserved space for the three-layer structure of the glass fiber cotton felt, where the modified non-woven fabric is placed in the upper and lower layers, and the modified cotton felt is placed in the middle layer;

[0376] (2) Then, laterally penetrate the modified cotton felt at the position of the middle layer structure, and evenly spray a protective agent on both sides of the modified cotton felt; the protective agent is polyethylene glycol;

[0377] (3) Finally, after the protective agent dries, penetrate the modified non-woven fabric into the upper and lower layers respectively, and use a curing machine to cure and dry at 85 °C for 30 min, and that's it.

[0378] The preparation method of the low bulk density glass fiber cotton felt described above,

[0379] The preparation method of the modified non-woven fabric described in step (1) is as follows:

[0380] Prepare the raw materials for the non-woven fabric;

[0381] Mix the above non-woven fabric raw materials and the modifier in a mass ratio of 1:0.06, transfer them to a magnetic stirrer, stir well and mix evenly, and heat up to 85 °C to obtain a molten liquid;

[0382] Vacuum dry the above molten liquid, where the drying temperature is 60 °C, that's all.

[0383] The preparation method of the low bulk density glass fiber cotton felt described above,

[0384] Among them, the non-woven fabric raw materials, by weight, include the following components:

[0385] 80 parts of polypropylene,

[0386] 20 parts of acrylic acid,

[0387] 5 parts of β-acryloyloxypropionic acid;

[0388] Among them, the modifier, by weight, includes the following components:

[0389] 28 parts of dodecyl mercaptan,

[0390] 10 parts of absolute ethanol,

[0391] 8 parts of maleic anhydride.

[0392] The preparation method of the low bulk density glass fiber cotton felt described above,

[0393] Among them, the preparation method of the modified cotton felt described in step (1) is as follows:

[0394] Prepare cotton felt raw materials;

[0395] Mix the above cotton felt raw materials and the modifier in a mass ratio of 1:0.02, transfer them to a magnetic stirrer, stir well and mix evenly, and heat up to 110 °C to obtain a molten liquid;

[0396] Carry out ultraviolet curing on the above molten liquid, that's all.

[0397] The preparation method of the low bulk density glass fiber cotton felt described above,

[0398] Among them, the cotton felt raw materials, by weight, include the following components:

[0399] 65 parts of cotton felt,

[0400] 18 parts of glass fiber,

[0401] 4 parts of melamine;

[0402] Among them, the modifier, by weight, includes the following components:

[0403] 18 parts of calcium oxide,

[0404] 12 parts of urea,

[0405] 7 parts of phenol.

[0406] The low bulk density glass fiber cotton felt obtained by the preparation method as described above.

[0407] Test Example

[0408] Select the materials prepared in Examples 1-5 and the materials prepared in Comparative Examples 1-5, and conduct noise reduction performance and flame retardancy performance tests respectively.

[0409] (1) Noise reduction performance

[0410] After making the material with a thickness of 20 mm and drying it, take 2 frequencies in the range of 0 - 5000 Hz of the octave band for test comparison, and take the arithmetic mean of the sound absorption coefficients at 1000 and 2000 Hz to calculate the noise reduction coefficient.

[0411] Table 1 Noise reduction performance

[0412] Noise reduction coefficient NRC Average sound absorption coefficient α Example 1 0.68 0.58 Example 2 0.69 0.62 Example 3 0.69 0.64 Example 4 0.71 0.64 Example 5 0.74 0.68 Comparative Example 1 0.60 0.51 Comparative Example 2 0.55 0.50 Comparative Example 3 0.52 0.45 Comparative Example 4 0.50 0.43 Comparative Example 5 0.47 0.40

[0413] (2) Flame retardancy performance

[0414] Test the limiting oxygen index (LOI) of the material according to GB / T 2406—2009.

[0415] Table 2 Flame retardancy performance

[0416] Oxygen index % Example 1 30.8 Example 2 31.2 Example 3 31.5 Example 4 31.9 Example 5 32.3 Comparative Example 1 26.0 Comparative Example 2 22.1 Comparative Example 3 20.7 Comparative Example 4 19.7 Comparative Example 5 13.2

[0417] To sum up, this application designs a three-component structure of glass fiber cotton felt, in which a protective agent is designed. The protective agent can achieve the compatibility between the cotton felt and the non-woven fabric, improve the stability between the cotton felt and the non-woven fabric, and meet the use requirements of auxiliary materials for airplanes. At the same time, β-acryloyloxypropionic acid is first applied to the modification treatment of the non-woven fabric to realize the phase change transformation in the synthesis process of the non-woven fabric, reduce the surface free energy, improve the heat insulation and noise reduction effect of the non-woven fabric, and reduce the internal voids of the non-woven fabric, thereby providing overall stability. Moreover, dodecyl mercaptan and maleic anhydride further play a comprehensive flame retardant effect; for the cotton felt, the addition of glass fiber can enhance the flame retardancy and noise reduction performance, but melamine can interact with calcium oxide particles to form an interpenetrating three-dimensional interlocked network structure. The interlocked structure increases the flow resistance and improves the overall porosity and action strength of the cotton felt. Generally speaking, through testing, it is found that this material has excellent noise reduction performance, can meet the noise reduction requirements of the aircraft cabin, and has excellent flame retardancy, meeting the flame retardant requirements of the cabin.

[0418] The above content is a further detailed description of the present invention in combination with specific embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as falling within the protection scope determined by the claims submitted for the present invention.

Claims

1. A preparation method of a low bulk density glass fiber cotton felt, characterized in that, It includes the following steps: (1) First, set the reserved space for the three-layer structure of the fiberglass batt. The modified non-woven fabric is placed in the upper and lower layer structures, and the modified batt is placed in the middle layer structure; (2) Then, laterally insert the modified batt at the position of the middle layer structure, and evenly spray a protective agent on both sides of the modified batt; the protective agent is a mixed solution of benzophenone and polyethylene glycol, and the volume ratio between benzophenone and polyethylene glycol is 3:5; (3) Finally, after the protective agent dries, insert the modified non-woven fabric into the upper and lower layer structures respectively, and use a curing machine to cure and dry at 85 °C for 25 - 35 min, then it is done; The preparation method of the modified non-woven fabric described in step (1) is as follows: Prepare the non-woven fabric raw material; Mix the above non-woven fabric raw material and modifier I in a mass ratio of 1:0.06, transfer it to a magnetic stirrer, stir and mix thoroughly, and heat up to 85 °C to obtain a molten liquid; Vacuum-dry the above molten liquid, where the drying temperature is 60 °C, then it is done; The non-woven fabric raw material, by weight, includes the following components: Polypropylene 70 - 90 parts, Acrylic acid 15 - 25 parts, β-acryloyloxypropionic acid 3 - 8 parts; The modifier I, by weight, includes the following components: Dodecyl mercaptan 20 - 30 parts, Absolute ethanol 5 - 15 parts, Maleic anhydride 5 - 10 parts; The preparation method of the modified batt described in step (1) is as follows: Prepare the batt raw material; Mix the above batt raw material and modifier II in a mass ratio of 1:0.02, transfer it to a magnetic stirrer, stir and mix thoroughly, and heat up to 110 °C to obtain a molten liquid; Ultraviolet-cure the above molten liquid, then it is done; The batt raw material, by weight, includes the following components: Batt 50 - 70 parts, Glass fiber 15 - 25 parts, Melamine 2 - 6 parts; The modifier II, by weight, includes the following components: Calcium oxide 10 - 20 parts, Urea 5 - 15 parts, Phenol 5 - 8 parts.

2. The preparation method of the low bulk density fiberglass batt according to claim 1, characterized in that The non-woven fabric raw material, by weight, includes the following components: Polypropylene 75 - 85 parts, Acrylic acid 17 - 22 parts, β-acryloyloxypropionic acid 3 - 8 parts; The modifier I, by weight, includes the following components: Dodecyl mercaptan 25 - 30 parts, Absolute ethanol 5 - 15 parts, Maleic anhydride 5 - 10 parts.

3. The preparation method of the low bulk density fiberglass batt according to claim 2, characterized in that The non-woven fabric raw material, by weight, includes the following components: Polypropylene 80 parts, Acrylic acid 20 parts, β-acryloyloxypropionic acid 5 parts; The modifier II, by weight, includes the following components: Dodecyl mercaptan 28 parts, Absolute ethanol 10 parts, Maleic anhydride 8 parts.

4. The preparation method of the low bulk density fiberglass batt according to claim 1, characterized in that The cotton felt raw materials mentioned above, by weight, include the following components: Cotton felt: 55 parts - 70 parts, Glass fiber: 15 parts - 22 parts, Melamine: 2 parts - 6 parts; The modifier II mentioned above, by weight, includes the following components: Calcium oxide: 15 parts - 20 parts, Urea: 5 parts - 15 parts, Phenol: 5 parts - 8 parts.

5. The method for preparing the low bulk density glass fiber cotton felt according to claim 4, wherein The cotton felt raw materials mentioned above, by weight, include the following components: Cotton felt: 65 parts, Glass fiber: 18 parts, Melamine: 4 parts; The modifier II mentioned above, by weight, includes the following components: Calcium oxide: 18 parts, Urea: 12 parts, Phenol: 7 parts.

6. A low bulk density glass fiber cotton felt obtained by the preparation method according to any one of claims 1 - 5.