Flame-retardant sound-insulation cotton for household appliances and production method
By mixing modified polyurethane fiber with glass fiber to form a porous fiber layer and setting a waterproof layer on the fiber layer, the problem of poor flame retardant performance of sound insulation cotton for household appliances is solved, achieving efficient flame retardant and sound insulation effects, and improving the safety and comfort of household appliances.
Patent Information
- Application Number
- CN202511171226.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-21
- Publication Date
- 2025-11-28
AI Technical Summary
Existing sound insulation materials for household appliances have poor flame retardant properties, making them prone to spontaneous combustion at high temperatures and potentially causing fires during use. They also fail to effectively reduce noise diffusion.
A porous fiber layer is made by mixing modified polyurethane fiber with glass fiber, and a waterproof layer is set on the fiber layer. The modified polyurethane fiber has good flame retardant properties. Tributyl phosphate is grafted through transesterification to improve the flame retardant properties, and a sound-absorbing coating is formed in the fiber layer to enhance the sound insulation effect.
It achieves highly efficient flame retardant and sound insulation properties of flame-retardant sound insulation cotton, avoiding the risk of spontaneous combustion due to high temperature, while significantly reducing noise transmission and improving the safety and comfort of household appliances.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of sound insulation cotton technology, specifically to a flame-retardant sound insulation cotton for household appliances and its production method. Background Technology
[0002] With rapid economic development, the number of household appliances in residents' homes has also increased. However, the operation of components such as motors, compressors, and fans in household appliances generates mechanical vibrations and aerodynamic noise, such as the "humming" sound of a refrigerator compressor and the spinning sound of a washing machine. These noises can cause irritability due to their sharp tones or low-frequency resonance, thus affecting people's sleep. Therefore, it is necessary to prevent the spread of noise by inserting sound insulation cotton inside household appliances.
[0003] Most existing sound insulation cotton is made of polyester material, but polyester material has poor flame retardant properties. Household appliances such as air conditioners and refrigerators generate a lot of heat during use. As the usage time increases, the components may overheat or leak electricity, causing the sound insulation cotton to be ignited and thus causing a fire. Summary of the Invention
[0004] To address the aforementioned problems, this invention provides a flame-retardant and sound-insulating cotton for household appliances and a method for producing it.
[0005] The technical solution of the present invention is: a flame-retardant and sound-insulating cotton for household appliances, comprising a fiber layer and a waterproof layer disposed on the fiber layer; by weight, the fiber layer comprises: 30-40 parts modified polyurethane fiber, 40-50 parts glass fiber, 8-10 parts adhesive, 5-10 parts stearyl alcohol, 3-5 parts 3-aminopropyltriethoxysilane, and 15-20 parts water; the waterproof layer comprises: 20-30 parts acrylate, 5-10 parts petroleum resin, 1-5 parts perfluorooctyltriethoxysilane, 6-10 parts polyethylene glycol, 3-5 parts nano-graphene, and 30-40 parts water.
[0006] Note: The above-mentioned flame-retardant sound insulation cotton is made by mixing modified polyurethane fibers with glass fibers to form a porous fiber layer, which hinders the diffusion of sound. The modified polyurethane fibers have good flame-retardant properties, which can effectively prevent the flame-retardant sound insulation cotton from spontaneously combusting due to high temperature. In addition, the modified polyurethane fibers can absorb stearyl alcohol to form a sound-absorbing coating, further improving the sound insulation performance of the flame-retardant sound insulation cotton.
[0007] Furthermore, the method for preparing the modified polyurethane fiber includes the following steps:
[0008] S1. Add tributyl phosphate and maleic anhydride to N-methylpyrrolidone and stir for 10-20 min. Then react at 70-80℃ for 2-3 hours to obtain an intermediate. The mass ratio of tributyl phosphate, maleic anhydride and N-methylpyrrolidone is 1:0.5-0.8:1-2.
[0009] S2. Dissolve polyurethane and stannous octoate in N-methylpyrrolidone, then heat to 70-90°C under nitrogen atmosphere and hold for 1-1.5 h to obtain a mixture; wherein the mass ratio of polyurethane, stannous octoate and N-methylpyrrolidone is 1:0.01-0.03:1.5-2.
[0010] S3. Lower the temperature of the mixture to 0-5℃, then heat the mixture. Add an intermediate to the mixture every 20-25℃ increase in temperature. Stop heating after each addition of the intermediate. After the temperature of the mixture drops by 5-10℃, adjust the pH of the mixture to 5-6 using dilute hydrochloric acid. Then continue heating the mixture until all the intermediate has been added. Let it stand for 2-3 hours, then distill under reduced pressure to obtain the polyurethane masterbatch. The total volume ratio of the mixture to the intermediate is 3-4:1, and the amount of the intermediate added at one time accounts for 15-25% of its total volume.
[0011] S4. Dissolve the polyurethane masterbatch in a solvent, then add polyvinyl alcohol to the solvent and ultrasonically disperse for 20-30 minutes to obtain the spinning solution; wherein, the mass ratio of polyurethane masterbatch, polyvinyl alcohol and solvent is 1:0.1-0.2:5-7.
[0012] S5. Using a spinning machine, the spinning solution is injected into the coagulation bath at a speed of 8-12 mL / min. Then, the fibers are stretched, heat-set, and wound in sequence to obtain long fibers. The long fibers are cut into short fibers with a length of 1-3 mm to obtain modified polyurethane fibers.
[0013] Note: The above method uses maleic anhydride as an intermediate to graft tributyl phosphate onto polyurethane through transesterification, which gives the prepared polyurethane fiber good flame retardant properties. Furthermore, the phosphate groups of tributyl phosphate can combine with stearyl alcohol in the fiber layer to form a sound-absorbing coating in the fiber layer, further improving the sound insulation performance of the flame-retardant sound insulation cotton.
[0014] Furthermore, in step S3, the mass concentration of the dilute hydrochloric acid is 5-10%.
[0015] Note: The above-mentioned concentration of dilute hydrochloric acid can accurately adjust the pH, and is safe to use and easy to prepare.
[0016] Further, in step S4, the solvent is prepared by mixing lithium chloride and dimethylacetamide in a mass ratio of 1:8 to 10.
[0017] Note: The solvents of the above components have good solubility and can fully dissolve polyurethane fibers, ensuring the uniformity of the fibers after spinning.
[0018] Furthermore, in step S5, the coagulation bath is prepared by mixing water and acetone in a mass ratio of 1:4 to 6.
[0019] Note: The above coagulation bath can rapidly shape the fibers, ensuring the surface quality of the fibers and preventing defects from appearing on the fiber surface.
[0020] Furthermore, the adhesive is a water-based polyurethane.
[0021] Note: The above adhesive can penetrate into the fiber layer, enabling the fibers within the fiber layer to bond quickly and improving the structural strength of the fiber layer.
[0022] On the other hand, the present invention also provides a method for preparing flame-retardant sound-insulating cotton for household appliances, comprising the following steps:
[0023] 1) According to the composition and weight parts of the fiber layer, the adhesive, stearyl alcohol, 3-aminopropyltriethoxysilane and water are mixed and stirred for 10-15 minutes to obtain an adhesive solution; according to the composition and weight parts of the waterproof layer, acrylate, petroleum resin, perfluorooctyltriethoxysilane, polyethylene glycol, nano-graphene and water are mixed and ultrasonically dispersed for 20-25 minutes to obtain a waterproof coating.
[0024] 2) Mix the modified polyurethane fiber and glass fiber evenly to obtain a mixed fiber. After cross-laying the mixed fiber, spray the adhesive onto the mixed fiber and place it in a mold. Hot press for 6-8 minutes to obtain a fiber layer.
[0025] 3) Apply the waterproof coating evenly to the fiber layer. After coating, cure for 24-48 hours to obtain flame-retardant sound insulation cotton.
[0026] Note: The above preparation method involves spraying the adhesive onto the mixed fibers and then hot-pressing it to form a fiber layer, which gives the fiber layer good structural strength. Furthermore, the phosphate groups on the modified polyurethane fibers can adsorb stearyl alcohol to form a sound-absorbing coating inside the fibers, further improving the sound insulation performance of the flame-retardant sound insulation cotton.
[0027] Furthermore, the hot pressing temperature is 180–200°C, and the pressure is 2.7–3.3 MPa.
[0028] Note: The above hot pressing parameters allow the adhesive to fully solidify, ensuring the structural strength of the fiber layer.
[0029] The beneficial effects of this invention are:
[0030] (1) The flame-retardant sound insulation cotton of the present invention is made by mixing modified polyurethane fiber with glass fiber to form a porous fiber layer to hinder the diffusion of sound. The modified polyurethane fiber has good flame-retardant properties, which can effectively prevent the flame-retardant sound insulation cotton from spontaneously combusting due to high temperature. The modified polyurethane fiber can adsorb stearyl alcohol to form a sound-absorbing coating, further improving the sound insulation performance of the flame-retardant sound insulation cotton.
[0031] (2) The preparation method of the present invention involves spraying the adhesive onto the mixed fibers and hot-pressing it to form a fiber layer, which gives the fiber layer good structural strength. Furthermore, the phosphate groups on the modified polyurethane fibers can adsorb stearyl alcohol to form a sound-absorbing coating inside the fibers, which further improves the sound insulation performance of the flame-retardant sound insulation cotton. Detailed Implementation
[0032] To further illustrate the methods and effects of this invention, the technical solution of this invention will be clearly and completely described below in conjunction with experiments.
[0033] Example 1: A flame-retardant and sound-insulating cotton for household appliances, comprising a fiber layer and a waterproof layer disposed on the fiber layer; by weight, the fiber layer comprises: 35 parts modified polyurethane fiber, 45 parts glass fiber, 9 parts adhesive, 8 parts stearyl alcohol, 4 parts 3-aminopropyltriethoxysilane, and 18 parts water; the waterproof layer comprises: 25 parts acrylate, 8 parts petroleum resin, 3 parts perfluorooctyltriethoxysilane, 8 parts polyethylene glycol, 4 parts nano-graphene, and 35 parts water; wherein, the adhesive is waterborne polyurethane;
[0034] The preparation method of modified polyurethane fibers includes the following steps:
[0035] S1. Tributyl phosphate and maleic anhydride were added to N-methylpyrrolidone and stirred for 15 min. Then, the mixture was reacted at 75 °C for 2.5 hours to obtain an intermediate. The mass ratio of tributyl phosphate, maleic anhydride and N-methylpyrrolidone was 1:0.6:1.5.
[0036] S2. Dissolve polyurethane and stannous octoate in N-methylpyrrolidone, then heat to 80°C under nitrogen atmosphere and hold for 1.2 h to obtain a mixture; wherein the mass ratio of polyurethane, stannous octoate and N-methylpyrrolidone is 1:0.02:1.8.
[0037] S3. Lower the temperature of the mixture to 2℃, then heat the mixture. Add an intermediate to the mixture every 22℃ increase in temperature. Stop heating after each addition of intermediate. After the temperature of the mixture drops by 8℃, adjust the pH of the mixture to 5.5 with dilute hydrochloric acid. Then continue heating the mixture until all the intermediate has been added. Let it stand for 2.5 hours, then distill under reduced pressure to obtain polyurethane masterbatch. The total volume ratio of the mixture to the intermediate is 3.5:1, the single addition amount of the intermediate is 20% of its total volume, and the mass concentration of dilute hydrochloric acid is 8%.
[0038] S4. Dissolve the polyurethane masterbatch in the solvent, then add polyvinyl alcohol to the solvent and ultrasonically disperse for 25 minutes to obtain the spinning solution; wherein, the mass ratio of polyurethane masterbatch, polyvinyl alcohol and solvent is 1:0.15:6, and the solvent is prepared by mixing lithium chloride and dimethylacetamide in a mass ratio of 1:9.
[0039] S5. The spinning solution is injected into the coagulation bath at a speed of 10 mL / min using a spinning machine. Then, the spinning solution is stretched, heat-set and wound in sequence to obtain long fibers. The long fibers are cut into short fibers with a length of 2 mm to obtain modified polyurethane fibers. The coagulation bath is prepared by mixing water and acetone in a mass ratio of 1:5.
[0040] The preparation method of the above-mentioned flame-retardant sound-insulating cotton includes the following steps:
[0041] 1) According to the composition and weight parts of the fiber layer, the adhesive, stearyl alcohol, 3-aminopropyltriethoxysilane and water are mixed and stirred for 12 minutes to obtain an adhesive solution; according to the composition and weight parts of the waterproof layer, acrylate, petroleum resin, perfluorooctyltriethoxysilane, polyethylene glycol, nano-graphene and water are mixed and ultrasonically dispersed for 22 minutes to obtain a waterproof coating.
[0042] 2) Mix the modified polyurethane fiber and glass fiber evenly to obtain the mixed fiber. After the mixed fiber is cross-laid, the adhesive is sprayed onto the mixed fiber and placed in a mold. It is hot-pressed for 7 minutes to obtain the fiber layer. The hot-pressing temperature is 190℃, the pressure is 3.0MPa, and the fiber layer thickness is 10mm.
[0043] 3) Apply the waterproof coating evenly to the fiber layer. After coating, cure for 36 hours to obtain flame-retardant sound insulation cotton.
[0044] Example 2: This example is basically the same as Example 1, except that, by weight, the fiber layer comprises: 30 parts modified polyurethane fiber, 40 parts glass fiber, 8 parts adhesive, 5 parts stearyl alcohol, 3 parts 3-aminopropyltriethoxysilane, and 15 parts water; the waterproof layer comprises: 20 parts acrylate, 5 parts petroleum resin, 1 part perfluorooctyltriethoxysilane, 6 parts polyethylene glycol, 3 parts nano-graphene, and 30 parts water.
[0045] Example 3: This example is basically the same as Example 1, except that, by weight, the fiber layer comprises: 40 parts modified polyurethane fiber, 50 parts glass fiber, 10 parts adhesive, 10 parts stearyl alcohol, 5 parts 3-aminopropyltriethoxysilane, and 20 parts water; the waterproof layer comprises: 30 parts acrylate, 10 parts petroleum resin, 5 parts perfluorooctyltriethoxysilane, 10 parts polyethylene glycol, 5 parts nano-graphene, and 40 parts water.
[0046] Example 4: This example is basically the same as Example 1, except that the mass ratio of tributyl phosphate, maleic anhydride and N-methylpyrrolidone is 1:0.5:1.
[0047] Example 5: This example is basically the same as Example 1, except that the mass ratio of tributyl phosphate, maleic anhydride and N-methylpyrrolidone is 1:0.8:2.
[0048] Example 6: This example is basically the same as Example 1, except that the mass ratio of polyurethane, stannous octoate and N-methylpyrrolidone is 1:0.01:1.5.
[0049] Example 7: This example is basically the same as Example 1, except that the mass ratio of polyurethane, stannous octoate and N-methylpyrrolidone is 1:0.03:2.
[0050] Example 8: This example is basically the same as Example 1, except that an intermediate is added to the mixture every time the temperature of the mixture increases by 20°C.
[0051] Example 9: This example is basically the same as Example 1, except that an intermediate is added to the mixture every time the temperature of the mixture increases by 25°C.
[0052] Example 10: This example is basically the same as Example 1, except that after the temperature of the mixture drops by 5°C, the pH value of the mixture is adjusted to 5.5 using dilute hydrochloric acid, and then the mixture is heated.
[0053] Example 11: This example is basically the same as Example 1, except that after the temperature of the mixture drops by 10°C, the pH value of the mixture is adjusted to 5.5 using dilute hydrochloric acid, and then the mixture is heated.
[0054] Example 12: This example is basically the same as Example 1, except that the total volume ratio of the mixture to the intermediate is 3:1.
[0055] Example 13: This example is basically the same as Example 1, except that the total volume ratio of the mixture to the intermediate is 4:1.
[0056] Example 14: This example is basically the same as Example 1, except that the amount of intermediate added at one time accounts for 15% of its total volume.
[0057] Example 15: This example is basically the same as Example 1, except that the amount of intermediate added at one time accounts for 25% of its total volume.
[0058] Example 16: This example is basically the same as Example 1, except that the mass ratio of polyurethane masterbatch, polyvinyl alcohol and solvent is 1:0.1:5.
[0059] Example 17: This example is basically the same as Example 1, except that the mass ratio of polyurethane masterbatch, polyvinyl alcohol and solvent is 1:0.2:7.
[0060] Example 18: This example is basically the same as Example 1, except that a spinning machine is used to inject the spinning solution into the coagulation bath at a speed of 8 mL / min.
[0061] Example 19: This example is basically the same as Example 1, except that a spinning machine is used to inject the spinning solution into the coagulation bath at a rate of 12 mL / min.
[0062] Example 20: This example is basically the same as Example 1, except that the hot pressing temperature is 180℃ and the pressure is 2.7MPa.
[0063] Example 21: This example is basically the same as Example 1, except that the hot pressing temperature is 200℃ and the pressure is 3.3MPa.
[0064] Comparative Example 1: Referring to Example 1, the modified polyurethane fiber was replaced with unmodified polyurethane fiber.
[0065] Comparative Example 2: Using Example 1 as a reference, water was used instead of stearyl alcohol.
[0066] Comparative Example 3: Referring to Example 1, the intermediate was added to the mixture all at once.
[0067] Comparative Example 4: Referring to Example 1, after each addition of the intermediate, without waiting for the temperature of the mixture to drop, the pH of the mixture was adjusted to 5.5 with dilute hydrochloric acid and then heating continued.
[0068] Experimental Example: To investigate the performance of the flame-retardant sound-insulating cotton prepared in each embodiment, the sound insulation performance of the flame-retardant sound-insulating cotton prepared in each embodiment was tested using the reverberation chamber method, and the flame-retardant performance of the flame-retardant sound-insulating cotton prepared in each embodiment was also tested. The specific investigation is as follows:
[0069] Experiment Example 1: Investigating the effect of flame-retardant sound insulation cotton composition on its properties.
[0070] Using Examples 1-3 and Comparative Examples 1-2 as experimental comparisons, the performance of flame-retardant sound-insulating cotton with different compositions is shown in Table 1 below:
[0071] Table 1 Performance of Flame-Retardant Sound Insulation Cotton with Different Compositions
[0072]
[0073] As shown in Table 1, compared with Examples 1, 2 and 3, the flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. Therefore, the flame-retardant sound insulation cotton fiber layer composition selected in Example 1 is optimal.
[0074] Compared with Comparative Examples 1 and 2, in Example 1, the sound insulation and flame retardant properties of the flame-retardant sound insulation cotton decreased significantly after the modified polyurethane fiber was replaced with unmodified polyurethane fiber or water was used instead of stearyl alcohol. This indicates that the modified polyurethane fiber can effectively improve the sound insulation and flame retardant properties of the flame-retardant sound insulation cotton by combining with stearyl alcohol. Therefore, the flame-retardant sound insulation cotton composition selected in Example 1 is optimal.
[0075] Experiment Example 2: Investigating the effect of intermediate components on the performance of flame-retardant sound insulation cotton.
[0076] Using Examples 1 and 4-5 as experimental comparisons, the flame-retardant and sound-insulating cotton properties with different intermediate components are shown in Table 2 below:
[0077] Table 2. Performance of flame-retardant and sound-insulating cotton with different intermediate components.
[0078]
[0079] As shown in Table 2, compared with Examples 1, 4, and 5, the flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. This may be because the intermediate component of Example 1, tributyl phosphate, can fully react with maleic anhydride. Therefore, the intermediate component selected in Example 1 is the optimal one.
[0080] Experiment Example 3: Investigating the effect of mixture composition on the performance of flame-retardant sound insulation cotton.
[0081] Using Examples 1 and 6-7 as experimental comparisons, the flame-retardant and sound-insulating cotton performance under different mixture compositions is shown in Table 3 below:
[0082] Table 3. Performance of flame-retardant and sound-insulating cotton with different mixture compositions.
[0083]
[0084] As shown in Table 3, compared with Examples 1, 6, and 7, the flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. This may be because the intermediate in the mixture of Example 1 can fully react with the mixture, so the mixture composition selected in Example 1 is optimal.
[0085] Experiment Example 4: Investigating the Influence of Polyurethane Masterbatch Preparation Parameters on the Performance of Flame-Retardant Sound Insulation Cotton
[0086] Using Examples 1, 8-15, and Comparative Examples 3-4 as experimental comparisons, the flame-retardant sound insulation cotton performance under different polyurethane masterbatch preparation parameters is shown in Table 4 below:
[0087] Table 4. Flame-retardant and sound-insulating cotton performance under different polyurethane masterbatch preparation parameters.
[0088]
[0089]
[0090] As shown in Table 4, compared with Examples 1, 8, 9, 10, and 11, Example 1 has the highest sound insulation and oxygen index for flame-retardant sound insulation cotton, indicating that Example 1 has the best sound insulation and flame-retardant performance. This may be because the tributyl phosphate can be fully grafted onto the polyurethane at the mixing temperature selected in Example 1. Therefore, the mixing temperature and the amount of change selected in Example 1 are the best.
[0091] Compared with Examples 1, 12, and 13: The flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. This may be because the polyurethane masterbatch has a stable internal structure and fewer defects under the ratio of mixture to intermediate selected in Example 1. Therefore, the ratio of mixture to intermediate selected in Example 1 is the optimal.
[0092] Compared with Examples 1, 14, and 15: The flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. This may be because the reaction between tributyl phosphate and polyurethane is the most complete under the single addition amount of the intermediate selected in Example 1. Therefore, the single addition amount of the intermediate selected in Example 1 is optimal.
[0093] Compared with Comparative Examples 3 and 4, Example 1 shows that adding all the intermediates to the mixture at once or adding the intermediates without waiting for the temperature of the mixture to drop will cause a decrease in the sound insulation and flame retardant properties of the flame-retardant sound insulation cotton. This may be because the intermediates cannot react fully with the mixture, resulting in the polyurethane failing to be effectively grafted with tributyl phosphate. Therefore, the polyurethane masterbatch preparation method selected in Example 1 is optimal.
[0094] Experiment Example 5: Investigating the Influence of Spinning Parameters on the Performance of Flame-Retardant Sound Insulation Cotton
[0095] Using Examples 1 and 16-19 as comparative experiments, the flame-retardant and sound-insulating cotton properties under different spinning parameters are shown in Table 5 below:
[0096] Table 5. Performance of flame-retardant and sound-insulating cotton under different spinning parameters
[0097]
[0098] As shown in Table 5, compared with Examples 1, 16, and 17, the flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. This may be because the polyurethane masterbatch can be fully dispersed under the spinning solution composition selected in Example 1, and the spinning solution composition is uniform. Therefore, the spinning solution composition selected in Example 1 is the optimal one.
[0099] Compared with Examples 1, 18, and 19, the flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. This may be because at the spinning solution injection speed selected in Example 1, the surface defects of the modified polyurethane fiber are the fewest and the internal structure is more uniform. Therefore, the spinning solution injection speed selected in Example 1 is the optimal one.
[0100] Experiment Example 6: Investigating the Influence of Hot-Pressure Parameters on the Performance of Flame-Retardant Sound Insulation Cotton
[0101] Using Examples 1 and 20-21 as comparative experiments, the flame-retardant and sound-insulating cotton performance under different hot-pressing parameters is shown in Table 6 below:
[0102] Table 6. Performance of flame-retardant and sound-insulating cotton under different hot-pressing parameters
[0103]
[0104] As shown in Table 6, compared with Examples 1, 20, and 21, the flame-retardant sound insulation cotton of Example 1 has the highest sound insulation and oxygen index, indicating that the flame-retardant sound insulation cotton of Example 1 has the best sound insulation and flame-retardant performance. This may be because the internal structure of the fiber layer is the most dense under the selected hot-pressing parameters in Example 1, so the selected hot-pressing parameters in Example 1 are optimal.
Claims
1. A flame-retardant and sound-insulating cotton for household appliances, characterized in that, Includes a fiber layer and a waterproof layer disposed on the fiber layer; By weight, the fiber layer comprises: 30-40 parts modified polyurethane fiber, 40-50 parts glass fiber, 8-10 parts adhesive, 5-10 parts stearyl alcohol, 3-5 parts 3-aminopropyltriethoxysilane, and 15-20 parts water; the waterproof layer comprises: 20-30 parts acrylate, 5-10 parts petroleum resin, 1-5 parts perfluorooctyltriethoxysilane, 6-10 parts polyethylene glycol, 3-5 parts nano-graphene, and 30-40 parts water.
2. The flame-retardant and sound-insulating cotton for household appliances according to claim 1, characterized in that, The method for preparing the modified polyurethane fiber includes the following steps: S1. Add tributyl phosphate and maleic anhydride to N-methylpyrrolidone and stir for 10-20 min. Then react at 70-80℃ for 2-3 hours to obtain an intermediate. The mass ratio of tributyl phosphate, maleic anhydride and N-methylpyrrolidone is 1:0.5-0.8:1-2. S2. Dissolve polyurethane and stannous octoate in N-methylpyrrolidone, then heat to 70-90°C under nitrogen atmosphere and hold for 1-1.5 h to obtain a mixture; wherein the mass ratio of polyurethane, stannous octoate and N-methylpyrrolidone is 1:0.01-0.03:1.5-2. S3. Lower the temperature of the mixture to 0-5℃, then heat the mixture. Add an intermediate to the mixture every 20-25℃ increase in temperature. Stop heating after each addition of the intermediate. After the temperature of the mixture drops by 5-10℃, adjust the pH of the mixture to 5-6 using dilute hydrochloric acid. Then continue heating the mixture until all the intermediate has been added. Let it stand for 2-3 hours, then distill under reduced pressure to obtain the polyurethane masterbatch. The total volume ratio of the mixture to the intermediate is 3-4:1, and the amount of the intermediate added at one time accounts for 15-25% of its total volume. S4. Dissolve the polyurethane masterbatch in a solvent, then add polyvinyl alcohol to the solvent and ultrasonically disperse for 20-30 minutes to obtain the spinning solution; wherein, the mass ratio of polyurethane masterbatch, polyvinyl alcohol and solvent is 1:0.1-0.2:5-7. S5. Using a spinning machine, the spinning solution is injected into the coagulation bath at a speed of 8-12 mL / min. Then, the fibers are stretched, heat-set, and wound in sequence to obtain long fibers. The long fibers are cut into short fibers with a length of 1-3 mm to obtain modified polyurethane fibers.
3. The flame-retardant and sound-insulating cotton for household appliances according to claim 2, characterized in that, In step S3, the mass concentration of the dilute hydrochloric acid is 5-10%.
4. The flame-retardant and sound-insulating cotton for household appliances according to claim 2, characterized in that, In step S4, the solvent is prepared by mixing lithium chloride and dimethylacetamide in a mass ratio of 1:8 to 10.
5. The flame-retardant and sound-insulating cotton for household appliances according to claim 2, characterized in that, In step S5, the coagulation bath is prepared by mixing water and acetone in a mass ratio of 1:4 to 6.
6. The flame-retardant and sound-insulating cotton for household appliances according to claim 1, characterized in that, The adhesive is water-based polyurethane.
7. A method for preparing flame-retardant sound-insulating cotton for household appliances as described in any one of claims 1 to 6, characterized in that, Includes the following steps: 1) According to the composition and weight parts of the fiber layer, the adhesive, stearyl alcohol, 3-aminopropyltriethoxysilane and water are mixed and stirred for 10-15 minutes to obtain an adhesive solution; according to the composition and weight parts of the waterproof layer, acrylate, petroleum resin, perfluorooctyltriethoxysilane, polyethylene glycol, nano-graphene and water are mixed and ultrasonically dispersed for 20-25 minutes to obtain a waterproof coating. 2) Mix the modified polyurethane fiber and glass fiber evenly to obtain a mixed fiber. After cross-laying the mixed fiber, spray the adhesive onto the mixed fiber and place it in a mold. Hot press for 6-8 minutes to obtain a fiber layer. 3) Apply the waterproof coating evenly to the fiber layer. After coating, cure for 24-48 hours to obtain flame-retardant sound insulation cotton.
8. The method for preparing flame-retardant and sound-insulating cotton for household appliances according to claim 7, characterized in that, The hot pressing temperature is 180–200℃, and the pressure is 2.7–3.3 MPa.