A kind of sound insulation cotton for anti-mildew and antibacterial of automobile interior and preparation method thereof

Abstract

The invention relates to the technical field of automobile materials, and specifically discloses a kind of mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration and a preparation method thereof. The sound-insulating cotton comprises: kapok fiber, antibacterial plant fiber, flax fiber, polylysine, acrylate, propylene fiber and a negative ion reactant; wherein the antibacterial plant fiber is prepared, the plant fiber is mixed and ground with an antibacterial electrolyte to increase the antibacterial activity of the plant fiber, active antibacterial particles are loaded to form an antibacterial structure, and the mixed fiber is mixed with other fibers to form a mixed fiber, and then subjected to silane composite electrostatic treatment to promote the fiber structure to form more closed cavities, and fatty acid ester is beneficial to increase the processing performance and moisture-proof performance of the fiber, and then mixed with the negative ion reactant to perform pore expansion treatment to increase and optimize the pores, thereby hindering the passage of sound waves and providing negative ion release channels; the sound-insulating cotton prepared by the invention has strong sound absorption performance and can effectively resist bacteria and remove mildew.

Description

Technical Field

[0001] The invention relates to the technical field of automobile materials, and in particular to a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration and a preparation method thereof. Background Art

[0002] Since the running of automobile components such as the engine, fan, brake, etc., as well as the driving environment, easily generate noise during driving, which affects the driving experience, it is generally necessary to install sound insulation cotton on the engine hood, seats and other places in the car to reduce noise by eliminating resonance and absorbing noise. At the same time, the sound insulation cotton also has the function of absorbing heat and keeping warm, which can maintain the temperature in the car stable; but cotton products are porous materials and easily absorb moisture. In humid weather, they are easy to absorb moisture and mold. At the same time, due to moisture, pollution and other reasons, it is easy to breed bacteria. In such a confined space in the car, mold and bacteria will have an impact on human health;

[0003] In order to produce sound insulation cotton with other functions, it will be designed as a composite structure, and the functionality of the sound insulation cotton is given by adding a functional layer. Patent CN106863972B discloses a composite sound insulation cotton, including an upper waterproof layer, a middle sound insulation layer, and a lower flame retardant layer. It has both waterproof and heat insulation functions, but once the functional layer is damaged, it will affect the performance of the entire sound insulation cotton; the current antibacterial and mildew-proof sound insulation cotton generally achieves antibacterial and mildew-proof by adding antibacterial ingredients and preparing an antibacterial layer, but it still does not improve its easy moisture absorption and dampness, and the problem that the antibacterial and mildew-proof effect is not long-lasting. Summary of the invention

[0004] In view of the above problems, the object of the present invention is to provide a sound insulation cotton for automobile interior decoration to prevent mildew and inhibit bacteria.

[0005] The technical contents of the present invention are as follows:

[0006] The present invention provides a method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration, comprising the following steps:

[0007] Step 1): soaking reed straw, bamboo fiber and chitin fiber in an antibacterial electrolyte solution in an equal mass ratio, grinding under negative pressure, and drying to obtain antibacterial fiber;

[0008] The antibacterial electrolyte solution is prepared by mixing 0.8-1.2 mg / mL cysteine, 0.8-1.2 mg / mL sodium borate, 1-1.6 mg / mL polyimide and 5-10% phosphate buffer;

[0009] The pressure of the negative pressure grinding is -0.1 to -0.4 MPa, and the time is 20 to 40 minutes;

[0010] The antibacterial plant fiber is subjected to negative pressure grinding by adding amphoteric electrolytes. Grinding can reduce the plant fiber to small molecules and promote a certain polymerization of the electrolyte under pressure. The anionic amine substances in the electrolyte can modify the side chains of the cationic fiber to increase the antibacterial effect. The amino acid structure can form hydrogen bonds with the fiber grafting, electrostatically adsorb antibacterial active particles, and increase its antibacterial activity by enriching its carbon-oxygen bonds.

[0011] Step 2): Mix the antibacterial plant fiber with kapok fiber, flax fiber and polypropylene fiber to obtain mixed fiber, spray (2-mercaptoethyl) triethoxysilane at a solid-liquid ratio of 3-5:11-15 g / mL under an electrostatic field for electrostatic treatment for 15-25 minutes, then add 24-28 wt% of hot-melt fatty acid ester, stir and mix them to obtain composite fiber;

[0012] The mixed fiber comprises the following components by weight: 20-30 parts of kapok fiber, 5-8 parts of antibacterial plant fiber, 1-3 parts of flax fiber, and 20-40 parts of polypropylene fiber;

[0013] The electrostatic field strength of the electrostatic treatment is 0.01-0.04V / m;

[0014] The fatty acid ester is one of zinc stearate and magnesium stearate;

[0015] Step 3): After the composite fiber and the negative ion reactant are stirred, a pore expansion treatment is performed, and then a web is formed and combed, and then dried, and then the polylysine and acrylate are mixed and kneaded in a banbury mixer for 40-80 minutes, sprayed on the upper and lower surfaces, covered with a non-woven fabric, and hot-pressed to prepare a sound insulation cotton;

[0016] The preparation process of the sound insulation cotton comprises the following components by weight: 18-28 parts of composite fiber, 2-5 parts of polylysine, 4-7 parts of acrylate, and 1-3 parts of negative ion reactant;

[0017] Among them, polylysine can enhance the viscosity and elasticity of acrylate through amidation reaction, and at the same time, the positive electrical properties of its rich amino structure promote a higher negative ion release rate on the surface of the sound insulation cotton;

[0018] The negative ion reactant is a blend of tourmaline and sodium humate, and the tourmaline is one or more of lithium tourmaline and chrome-magnesium tourmaline;

[0019] The amount of sodium humate added is 35-45wt% of the anion reactant;

[0020] The tourmaline containing negative ions in the negative ion reactant and the phenolic hydroxyl groups in the sodium humate can promote the migration and release of negative ions after being treated with pulsed ultrasound, and synergistically reduce and generate oxygen negative ion free radicals;

[0021] The pore expansion treatment is to subject the mixed material to pulse ultrasonic treatment;

[0022] The pulse ultrasonic treatment conditions are: temperature 40-70° C., frequency 20-40 kHz, power 100 W-600 W, and duty / interval ratio 5 s / 5 s to 0 s.

[0023] Beneficial effects: The preparation method of the sound insulation cotton for anti-mildew and antibacterial of automobile interior provided by the present invention adopts an integrated preparation process, prepares antibacterial plant fibers, mixes and grinds the plant fibers with antibacterial electrolytes, increases the antibacterial activity of the plant fibers, loads antibacterial active particles and forms an antibacterial structure, can effectively prevent bacteria and is mixed with other fibers to form mixed fibers, and then treated with silane composite electrostatic treatment to promote the fiber structure to form more closed cavities, fatty acid esters are beneficial to increase the processing performance and moisture resistance of the fibers, and then mixed with the negative ion reactant therein and then subjected to pore expansion treatment, thereby increasing the negative ion release channel while optimizing the pores, hindering the passage of sound waves while providing negative ion release channels, and the sound insulation cotton obtained has strong sound absorption performance and can effectively prevent bacteria and remove mildew;

[0024] The present invention also provides a sound insulation cotton for automobile interior decoration to prevent mildew and inhibit bacteria. The cotton has rich fibers inside, uniform pores, and both long channels and micro channels, which can absorb and insulate sound and has excellent noise reduction effect. At the same time, the fiber material used is hydrophobic, which overcomes the characteristic of easy moisture absorption of fiber materials and has moisture-proof, antibacterial and mildew-removing effects. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below through specific implementation cases. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of protection of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art are all within the scope of the claims attached to this application.

[0026] Unless otherwise specified, all raw materials and reagents of the present invention are raw materials and reagents from the conventional market.

[0027] The length of the antibacterial plant fiber used in the test is 30-40 mm, the length of the kapok fiber is 15-25 mm, the length of the flax fiber is 25-35 mm, and the length of the polypropylene fiber is 40-50 mm.

[0028] Example 1

[0029] A method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration comprises the following steps:

[0030] Step 1: After soaking reed straw, bamboo fiber and chitin fiber in an antibacterial electrolyte solution of equal mass ratio, negative pressure grinding is performed at a pressure of -0.3 MPa for 30 minutes, and then drying is performed to obtain antibacterial fiber; the antibacterial electrolyte solution is a mixture of 1 mg / mL cysteine, 1 mg / mL sodium borate and 1.3 mg / mL polyimide and 8% phosphate buffer;

[0031] Step 2: 22 parts of mixed fibers obtained by mixing 6 parts of antibacterial plant fibers with 25 parts of kapok fibers, 2 parts of flax fibers, and 30 parts of polypropylene fibers are sprayed with (2-mercaptoethyl) triethoxysilane at a solid-liquid ratio of 4:13 g / mL under an electrostatic field strength of 0.02 V / m for 20 minutes, and then 26 wt% of hot-melt zinc stearate is added to the mixture for heat preservation and stirring to obtain composite fibers;

[0032] Step 3: After the composite fiber is stirred with 2 parts of a blend consisting of lithium tourmaline and 40wt% sodium humate, pulse ultrasonic treatment is performed at a temperature of 55°C, a frequency of 30kHz, a power of 300W, and a working / intermittent ratio of 5s / 5s to 0s, followed by web combing and drying. Then, 3 parts of polylysine and 6 parts of acrylate are mixed and kneaded in a banbury mixer for 60 minutes, sprayed on the upper and lower surfaces, covered with non-woven fabric, and hot-pressed to prepare sound insulation cotton.

[0033] Example 2

[0034] A method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration comprises the following steps:

[0035] Step 1: After impregnating reed straw, bamboo fiber and chitin fiber in an equal mass ratio with an antibacterial electrolyte solution, the solution is subjected to negative pressure grinding at a pressure of -0.1 MPa for 20 minutes, and then dried to obtain antibacterial fiber; the antibacterial electrolyte solution is a mixture of 0.8 mg / mL cysteine, 0.8 mg / mL sodium borate and 1 mg / mL polyimide and 5% phosphate buffer;

[0036] Step 2: 18 parts of mixed fibers obtained by mixing 5 parts of antibacterial plant fibers with 20 parts of kapok fibers, 1 part of flax fibers, and 20 parts of polypropylene fibers are sprayed with (2-mercaptoethyl) triethoxysilane at a solid-liquid ratio of 3:11 g / mL under an electrostatic field strength of 0.01 V / m for 15 minutes, and then 24 wt% of hot-melt magnesium stearate is added for heat preservation and stirring to obtain composite fibers;

[0037] Step 3: After the composite fiber is stirred with 1 part of a blend consisting of lithium tourmaline and 35wt% of sodium humate, pulse ultrasonic treatment is performed at a temperature of 40°C, a frequency of 20kHz, a power of 100W, and a working / intermittent ratio of 5s / 5s to 0s, followed by web combing and drying. Then, 2 parts of polylysine and 4 parts of acrylate are mixed and kneaded in a banbury mixer for 40 minutes, sprayed on the upper and lower surfaces, covered with non-woven fabric, and hot-pressed to prepare sound insulation cotton.

[0038] Example 3

[0039] A method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration comprises the following steps:

[0040] Step 1: After impregnating reed straw, bamboo fiber and chitin fiber in an equal mass ratio with an antibacterial electrolyte solution, the solution is subjected to negative pressure grinding for 40 minutes at a pressure of -0.4 MPa, and then dried to obtain antibacterial fiber; the antibacterial electrolyte solution is a mixture of 1.2 mg / mL cysteine, 1.2 mg / mL sodium borate and 1.6 mg / mL polyimide and 10% phosphate buffer;

[0041] Step 2: 28 parts of mixed fibers obtained by mixing 8 parts of antibacterial plant fibers with 30 parts of kapok fibers, 1-3 parts of flax fibers, and 40 parts of polypropylene fibers are sprayed with (2-mercaptoethyl) triethoxysilane at a solid-liquid ratio of 5:15 g / mL under an electrostatic field strength of 0.04 V / m for 25 minutes, and then 28 wt% of hot-melt zinc stearate is added to the mixture for heat preservation and stirring to obtain composite fibers;

[0042] Step 3: After the composite fiber is stirred with 3 parts of a blend consisting of chrome magnesium tourmaline and 45wt% sodium humate, pulse ultrasonic treatment is performed at a temperature of 70°C, a frequency of 40kHz, a power of 600W, and a working / intermittent ratio of 5s / 5s to 0s, followed by web combing and drying. Then, 5 parts of polylysine and 7 parts of acrylate are mixed and kneaded in a banbury mixer for 80 minutes, sprayed on the upper and lower surfaces, covered with non-woven fabric, and hot-pressed to prepare sound insulation cotton.

[0043] Example 4

[0044] A method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration comprises the following steps:

[0045] Step 1: After impregnating reed straw, bamboo fiber and chitin fiber in an equal mass ratio with an antibacterial electrolyte solution, the solution is subjected to negative pressure grinding for 40 minutes at a pressure of -0.1 MPa, and then dried to obtain antibacterial fiber; the antibacterial electrolyte solution is a mixture of 0.8 mg / mL cysteine, 1.2 mg / mL sodium borate and 1 mg / mL polyimide and 5% phosphate buffer;

[0046] Step 2: 20 parts of mixed fibers obtained by mixing 6 parts of antibacterial plant fibers with 22 parts of kapok fibers, 2 parts of flax fibers, and 22 parts of polypropylene fibers are sprayed with (2-mercaptoethyl) triethoxysilane at a solid-liquid ratio of 3:12 g / mL under an electrostatic field strength of 0.01-0.04 V / m for 18 minutes, and then 25 wt% of hot-melt magnesium stearate is added for heat preservation and stirring to obtain composite fibers;

[0047] Step 3: After the composite fiber is stirred with 1 part of a blend consisting of lithium tourmaline and 38wt% sodium humate, pulse ultrasonic treatment is performed at a temperature of 50°C, a frequency of 25kHz, a power of 200W, and a working / intermittent ratio of 5s / 5s to 0s, and then the web is combed and dried. Then, 4 parts of polylysine and 4 parts of acrylate are mixed and kneaded in a banbury mixer for 50 minutes, sprayed on the upper and lower surfaces, covered with non-woven fabric, and hot-pressed to prepare sound insulation cotton.

[0048] Example 5

[0049] A method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration comprises the following steps:

[0050] Step 1: After impregnating reed straw, bamboo fiber and chitin fiber in an equal mass ratio with an antibacterial electrolyte solution, the solution is subjected to negative pressure grinding for 35 minutes at a pressure of -0.3 MPa, and then dried to obtain antibacterial fiber; the antibacterial electrolyte solution is a mixture of 1.1 mg / mL cysteine, 1.1 mg / mL sodium borate and 1.5 mg / mL polyimide and 8% phosphate buffer;

[0051] Step 2: 26 parts of mixed fibers obtained by mixing 5 parts of antibacterial plant fibers with 30 parts of kapok fibers, 1 part of flax fibers, and 30 parts of polypropylene fibers are sprayed with (2-mercaptoethyl) triethoxysilane at a solid-liquid ratio of 4:14 g / mL under an electrostatic field strength of 0.03 V / m for 15 minutes, and then 27 wt % of hot-melt magnesium stearate is added to the mixture for heat preservation and stirring to obtain composite fibers;

[0052] Step 3: After the composite fiber is stirred with 1-3 parts of a blend consisting of chrome magnesium tourmaline and 42wt% sodium humate, pulse ultrasonic treatment is performed at a temperature of 60°C, a frequency of 40kHz, a power of 500W, and a working / intermittent ratio of 5s / 5s to 0s, followed by web combing and drying. Then, 5 parts of polylysine and 4 parts of acrylate are mixed and kneaded in a banbury mixer for 70 minutes, sprayed on the upper and lower surfaces, covered with non-woven fabric, and hot-pressed to prepare sound insulation cotton.

[0053] Example 6

[0054] A method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration comprises the following steps:

[0055] Step 1: After impregnating reed straw, bamboo fiber and chitin fiber in an equal mass ratio with an antibacterial electrolyte solution, the solution is subjected to negative pressure grinding at a pressure of -0.4 MPa for 30 minutes, and then dried to obtain antibacterial fiber; the antibacterial electrolyte solution is a mixture of 1.1 mg / mL cysteine, 1.2 mg / mL sodium borate and 1.5 mg / mL polyimide and 10% phosphate buffer;

[0056] Step 2: 25 parts of mixed fibers obtained by mixing 5 parts of antibacterial plant fibers with 25 parts of kapok fibers, 2 parts of flax fibers, and 40 parts of polypropylene fibers are sprayed with (2-mercaptoethyl) triethoxysilane at a solid-liquid ratio of 3:15 g / mL under an electrostatic field strength of 0.04 V / m for 20 minutes, and then 24 wt% of hot-melt magnesium stearate is added for heat preservation and stirring to obtain composite fibers;

[0057] Step 3: After the composite fiber is stirred with 1 part of a blend consisting of lithium tourmaline and 45wt% of sodium humate, pulse ultrasonic treatment is performed at a temperature of 70°C, a frequency of 30kHz, a power of 300W, and a working / intermittent ratio of 5s / 5s to 0s, and then the web is combed and dried. Then, 2 parts of polylysine and 7 parts of acrylate are mixed and kneaded in a banbury mixer for 80 minutes, sprayed on the upper and lower surfaces, covered with non-woven fabric, and hot-pressed to prepare sound insulation cotton.

[0058] Comparative Example 1

[0059] The difference between Comparative Example 1 and Example 1 is that the antibacterial fiber of Comparative Example 1 is not impregnated with the antibacterial electrolyte solution, but is directly subjected to negative pressure grinding, and the other conditions remain unchanged.

[0060] Comparative Example 2

[0061] The difference between Comparative Example 2 and Example 1 is that step 2 is not performed during the preparation of the sound insulation cotton in Comparative Example 2, and various fiber raw materials are directly mixed, while other aspects remain unchanged.

[0062] Comparative Example 3

[0063] The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not undergo hole expansion treatment, and the other aspects remain unchanged.

[0064] Comparative Example 4

[0065] The difference between Comparative Example 4 and Example 1 is that the negative ion reactant in Comparative Example 4 is only an equal amount of tourmaline, and the other parts remain unchanged.

[0066] 1. The sound insulation cotton prepared in the embodiment and the comparative example was tested for sound insulation performance, and the results are shown in Table 1.

[0067] Table 1 Sound insulation performance

[0068]

[0069] It can be seen from Table 1 that the sound insulation cotton of the present invention has a large sound transmission loss and a good sound insulation effect.

[0070] 2. The sound insulation cotton prepared in the embodiment and the comparative example was subjected to antibacterial and bactericidal tests. The test results are shown in Table 2.

[0071] Table 2 Antibacterial and anti-mildew performance

[0072]

[0073]

[0074] It can be seen from Table 2 that the sound insulation cotton prepared by the present invention has strong inhibitory effects on Staphylococcus aureus, Escherichia coli and , and has both antibacterial and anti-mildew properties.

[0075] 3. Moisture-proof performance test of sound insulation cotton

[0076] After the sound insulation cotton was placed in an environment with a humidity of 60% rh for 24 hours and 48 hours, the moisture absorption rate of the sound insulation cotton was tested. The test results are shown in Table 3.

[0077] Table 3 Moisture absorption rate of sound insulation cotton

[0078]

[0079]

[0080] It can be seen from Table 3 that the sound insulation cotton prepared by the present invention has a small moisture absorption rate and good moisture-proof performance.

[0081] 4. Determine the amount of negative ions generated using GBT 30128-2013 Testing and evaluation of negative ion generation in textiles

[0082] Table 4 Negative ion generation test data table

[0083]

[0084]

[0085] It can be seen from Table 4 that the sound insulation cotton prepared by the present invention can effectively release negative ions and has a high concentration of negative ions.

[0086] In summary, from Comparative Example 1, it can be seen that in the preparation process of the sound insulation cotton of the present invention, antibacterial plant fibers that react with electrolytes under pressure to enrich antibacterial groups are added to increase the antibacterial activity;

[0087] It can be seen from Comparative Example 2 that the sound insulation cotton prepared by the present invention is mixed with various fibers, firstly treated with alkali and physically to improve the cavity structure of the fibers, and then fatty acid ester is used to optimize the processing performance of the fibers, thereby improving the comprehensive performance of the sound insulation cotton;

[0088] It can be seen from Comparative Example 3 that the sound insulation cotton prepared by the present invention also adopts physical treatment to optimize and increase the fiber pores through physical energy, improve the sound insulation, antibacterial and moisture-proof functions, and increase the channels for releasing negative ions;

[0089] It can be seen from Comparative Example 4 that the sound insulation cotton prepared by the present invention also contains a composite negative ion generator, which can mutually excite to generate negative ions. Compared with a single tourmaline raw material, it has stronger mildew and antibacterial functions.

Claims

1. A method for preparing mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration, characterized in that: The following steps are involved: Step 1): Reed straw, bamboo fiber and chitin fiber in equal mass ratio are immersed in an antibacterial electrolyte solution, then ground under negative pressure, and then dried to obtain antibacterial fiber; The antibacterial electrolyte solution is prepared by mixing 0.8-1.2 mg / mL cysteine, 0.8-1.2 mg / mL sodium borate, 1-1.6 mg / mL polyimide and 5-10% phosphate buffer; Step 2): The antibacterial fiber is mixed with kapok fiber, flax fiber and polypropylene fiber to obtain mixed fiber, and (2-mercaptoethyl) triethoxysilane is sprayed at a solid-liquid ratio of 3-5:11-15g / mL under the condition of an electrostatic field for electrostatic treatment for 15-25min, and then 24-28wt% of hot-melt fatty acid ester is added for heat preservation and stirring to obtain composite fiber; Step 3): After the composite fiber is stirred with the negative ion reactant, a pore expansion treatment is performed, and then a web is formed and combed, and dried. Then, the polylysine and acrylate are mixed and kneaded in a banbury mixer for 40-80 minutes, sprayed on the upper and lower surfaces, covered with non-woven fabric, and hot-pressed to prepare sound insulation cotton.

2. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 1, characterized in that: Step 1) The pressure of the negative pressure grinding is -0.1~-0.4MPa, and the time is 20-40min.

3. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 1, characterized in that: Step 2) The electrostatic field strength of the electrostatic treatment is 0.01-0.04 V / m.

4. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 1, characterized in that: Step 2) The fatty acid ester is one of zinc stearate and magnesium stearate.

5. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 1, characterized in that: Step 3) The negative ion reactant is a mixture of tourmaline and sodium humate, and the tourmaline is one or more of lithium tourmaline and chrome-magnesium tourmaline.

6. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 5, characterized in that: The addition amount of the sodium humate is 35-45wt% of the anion reactant.

7. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 1, characterized in that: Step 3) The pore expansion treatment is to subject the mixed material to pulse ultrasonic treatment; the pulse ultrasonic treatment conditions are: temperature 40-70°C, frequency 20-40kHz, power 100W-600W, working / interval ratio 5s / 5s~0s.

8. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 1, characterized in that: Step 2) The mixed fiber comprises the following components in parts by weight: 20-30 parts of kapok fiber, 5-8 parts of antibacterial fiber, 1-3 parts of flax fiber, and 20-40 parts of polypropylene fiber.

9. The method for preparing a mildew-proof and antibacterial sound-insulating cotton for automobile interior decoration according to claim 1, characterized in that: Step 3) The preparation process of the sound insulation cotton comprises the following components in parts by weight: 18-28 parts of composite fiber, 2-5 parts of polylysine, 4-7 parts of polyacrylate, and 1-3 parts of negative ion reactant.

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