Flame-retardant fluffy warm-keeping nanofiber blended cotton hydroentangled filling and production process thereof

Abstract

The present application relates to the technical field of filling, in particular to a kind of flame-retardant fluffy warm nanofiber mixed cotton hydroentangled filling and its production process.The application discloses a kind of flame-retardant fluffy warm nanofiber mixed cotton hydroentangled filling, including the PPSU / PU / PAI single fiber layer of overlapping spread net;The PPSU / PU / PAI single fiber layer is obtained by embedding PPSU / PU / PA micro-nanofiber into cotton fiber web.The flame-retardant fluffy warm nanofiber mixed cotton hydroentangled filling described in the application overcomes the defects of the water-jet cotton filling prepared by the prior art, such as light and thin, low bulkiness, poor resilience, poor warm-keeping property and poor washability.

Description

Technical Field

[0001] This invention relates to the technical field of filling materials, and in particular to a flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling material and its production process. Background Technology

[0002] Traditional all-cotton fillings are relatively thick and heavy, and are highly flammable when exposed to sparks. Their heat retention performance drops sharply in high-humidity environments, and they are prone to clumping and deformation after high-temperature washing, resulting in lower loft and affecting the product's lifespan and quality.

[0003] Current methods for preparing washable spunlace cotton filling involve mixing cotton and PLA fibers through 12 steps to achieve uniform blending. Vacuum drying further enhances the bulk, warmth, and washability of the two-component PLA fiber blended spunlace cotton filling, while also providing some flame retardancy. However, the mixing process is complex, and increasing the cotton content to over 90% significantly reduces its bulk and washability.

[0004] Electrospinning technology has been used to prepare various 3D fibrous aggregate materials with small pore size, high porosity, and light weight. For example, PS / PUFS fiber sponge, but it is highly flammable and prone to causing fires. Another method involves introducing organophosphate flame retardants into PSU / PU fiber sponge, but this fiber sponge has weak mechanical properties and a high thermal conductivity, requiring further improvement in its heat retention performance.

[0005] Therefore, this application provides a flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling and its production process. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling and its production process, which overcomes the defects of the spunlace cotton filling prepared by the prior art, such as being thin, having low fluffiness, poor resilience, low warmth retention, and poor washability.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] The primary objective of this application is to provide a flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling material, comprising overlapping and webbed PPSU / PU / PAI monofiber layers.

[0009] The PPSU / PU / PAI single fiber layer is obtained by embedding PPSU / PU / PA micro / nano fibers into a cotton fiber web.

[0010] Furthermore, the mass ratio of the PPSU / PU / PA micro / nanofibers to the cotton fiber web is 1:15-1:20.

[0011] Furthermore, the weight of the PPSU / PU / PAI single fiber layer is 10-20g, and the number of overlapping web layers is 4-6.

[0012] Furthermore, the method for preparing the PPSU / PU / PAI monofiber layer includes the following steps:

[0013] PPSU and PU were dissolved in an organic solvent, and BIP was added and stirred until dissolved to obtain spinning solution A; LiCl was added to the organic solvent under a low-humidity environment and stirred until dissolved, and then PAI was added and stirred at room temperature to obtain spinning solution B; spinning solution A and spinning solution B were mixed to obtain spinning solution C.

[0014] During the web-laying stage, an electrospinning device is installed above the cross-web-laying machine to electrospin the spinning solution C in a high-humidity environment. The electrospinning device produces PPSU / PU / PA micro / nano fibers.

[0015] Furthermore, the method for preparing the cotton fiber web includes the following steps:

[0016] The prepared pure cotton raw materials are combed to form a cotton fiber web.

[0017] Furthermore, the concentration of spinning solution A is 18-22 wt%; the concentration of spinning solution B is 16-20 wt%, and the mass ratio of PPSU to PU is 4:1; the mass ratio of spinning solution A to spinning solution B in spinning solution C is 1.5-0.7:1.

[0018] Furthermore, the electrospinning voltage is 30-50KV, the receiving distance is 20-30cm, the spinning temperature is 20-30℃, and the relative humidity is 70-80%.

[0019] Furthermore, a carding machine is used for carding, wherein the cylinder speed of the carding machine is 50-60 Hz, the linear speed of the cylinder and doffer is 1.52, and the roller speed is 25 Hz.

[0020] The second objective of this application is to provide a production process for the aforementioned flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling, comprising the following steps:

[0021] S1. Dissolve PPSU and PU in an organic solvent, add BIP and stir until dissolved to obtain spinning solution A; add LiCl to the organic solvent under low humidity and stir until dissolved, then add PAI and stir at room temperature to obtain spinning solution B; mix spinning solution A and spinning solution B to obtain spinning solution C.

[0022] S2. The prepared pure cotton raw materials are combed to form a cotton fiber web for output;

[0023] S3. Lay the cotton fiber web;

[0024] S4. During the web laying stage, an electrospinning device is installed above the cross-web laying machine to perform electrospinning in a high-humidity environment, embedding PPSU / PU / PA micro / nano fibers into the cotton fiber web to obtain a PPSU / PU / PAI single fiber layer.

[0025] S5. Overlap the PPSU / PU / PAI single fiber layers to form an overlapping fiber web layer;

[0026] S6. The fiber web layer laid in step S3 is stretched.

[0027] S7. The fiber web layer that has undergone stretching in step S4 is subjected to hydroentangling to obtain the primary filler.

[0028] S8. The primary filler is subjected to heat crosslinking treatment to obtain the intermediate filler;

[0029] S9. The intermediate filler that has been heat-crosslinked in step S7 is dried to obtain nanofiber blended cotton spunlace filler.

[0030] Furthermore, in step S6, when hydroentanglement is performed on the product after web laying, four hydroentanglement heads are used to hydroentangle the product after web laying, and the hydroentanglement pressures of the four hydroentanglement heads are 5 bar, 5 bar, 15 bar, and 15 bar respectively.

[0031] The heating crosslinking temperature is 130-150℃, and the time is 2-6 minutes.

[0032] The beneficial effects of this invention are:

[0033] 1. In this application, PPSU / PU / PA micro / nano fibers are mixed into spunlace cotton filling, which improves the flammability of spunlace cotton filling, reduces the weight of spunlace cotton, and can also insulate the infrared heat emitted by the human body in the form of thermal radiation, reduce heat loss, and thus improve the heat insulation performance of the filling.

[0034] 2. In this application, by combining electrospinning technology with hydroentangling process, fine nanofibers are distributed in the hydroentangling cotton filling, which makes the pore size of the hydroentangling cotton filling smaller, increases the proportion of internal still air, reduces the thermal conductivity, and increases the static water contact angle. Therefore, there are fewer water molecules inside the hydroentangling cotton with nanofiber blend, and the thermal conductivity of water is much higher than that of still air, which greatly improves its heat retention performance.

[0035] 3. In this application, a high-temperature cross-linking treatment is used to fix the nanofiber blended cotton spunlace filler, so that a micro-bonded structure is formed on the outside and an interlocking fiber network structure is formed on the inside. This effectively fixes and supports the cotton fiber web, improves the fluffiness and resilience of the filler, improves the situation where cotton fibers are displaced and entangled during washing, and enhances the wash resistance of the spunlace cotton filler. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Figure 1 This is a process flow diagram of the production process of the flame-retardant, fluffy, warm nanofiber blended cotton spunlace filling material described in this application;

[0038] Figure 2 This is a schematic diagram of the structure of the PPSU / PU / PAI monofiber layer described in this application;

[0039] Figure 3 A schematic diagram of the structure of the web-laying machine described in this application with an electrostatic spinning machine added. Detailed Implementation

[0040] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0041] As used herein, “and / or” includes all combinations of any and one or more of the associated listed items. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. Further understanding is needed; when used in this specification, “comprising” designates the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0042] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Further understanding is that terms, such as those defined in common dictionaries, are interpreted in accordance with their meaning in the context of the relevant field and are not idealized or overly formal, unless expressly defined herein.

[0043] The exemplary invention described herein may suitably omit any one or more limiting elements, which are not specifically disclosed herein. Therefore, terms such as “comprising,” “including,” “containing,” etc., should be interpreted broadly and non-limitingly. Furthermore, the terminology used herein is for descriptive purposes without limitation, and it is unintentional to use terms that do not include any equivalent characteristics, but only to describe a portion of their characteristics; however, various modifications are possible within the scope of the invention according to the claims. Therefore, while the invention has been specifically disclosed through preferred embodiments and optional features, variations of the invention embodied by the modifications disclosed herein may be noted by those skilled in the art, and such modifications and variations are considered to be within the scope of the invention.

[0044] All raw materials or reagents used in the embodiments and comparative examples of this invention were purchased from mainstream manufacturers on the market. Those without specified manufacturers or concentrations are all analytical grade raw materials or reagents that are routinely available. There are no particular restrictions as long as they achieve the expected effect. The reaction vessels and rotary evaporators used in this embodiment were all purchased from major manufacturers on the market. There are no particular limitations as long as they achieve the expected effect. Where specific techniques or conditions are not specified in this embodiment, they should be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions.

[0045] In order to overcome the defects of existing spunlace cotton filling materials, such as thinness, low fluffiness, poor resilience, low warmth retention, and poor washability, this application provides a flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling material, including overlapping web-laid PPSU / PU / PAI monofiber layers.

[0046] The PPSU / PU / PAI single fiber layer is obtained by embedding PPSU / PU / PA micro / nano fibers into a cotton fiber web.

[0047] Specifically, the mass ratio of the PPSU / PU / PA micro / nanofibers to the cotton fiber web is 1:15-1:20; the diameter of the PPSU / PU / PA micro / nanofibers is 1-100nm, preferably 50nm.

[0048] Among PPSU / PU / PA micro / nanofibers, PAI nanofibers have excellent flame retardancy. Adding some PAI to PPSU / PU nanofiber sponge can improve its flammability and enhance its warmth retention.

[0049] The weight of the PPSU / PU / PAI single fiber layer is 10-20g, and the number of overlapping web layers is 4-6.

[0050] The spunlace cotton filling is mixed with PPSU / PU / PA micro / nano fibers, which improves the flammability of the spunlace cotton filling, reduces the weight of the spunlace cotton, and can also insulate the infrared heat emitted by the human body in the form of thermal radiation, reducing heat loss and thus improving the warmth retention performance of the filling.

[0051] The second objective of this application is to provide a production process for the aforementioned flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling, comprising the following steps:

[0052] S1. Dissolve PPSU and PU in an organic solvent, add BIP and stir until dissolved to obtain spinning solution A; add LiCl to the organic solvent under low humidity and stir until dissolved, then add PAI and stir at room temperature to obtain spinning solution B; mix spinning solution A and spinning solution B to obtain spinning solution C.

[0053] S2. The prepared pure cotton raw materials are combed to form a cotton fiber web for output;

[0054] S3. Lay the cotton fiber web;

[0055] S4. During the web laying stage, an electrospinning device is installed above the cross-web laying machine to perform electrospinning in a high-humidity environment, embedding PPSU / PU / PA micro / nano fibers into the cotton fiber web to obtain a PPSU / PU / PAI single fiber layer.

[0056] S5. Overlap the PPSU / PU / PAI single fiber layers to form an overlapping fiber web layer;

[0057] S6. The fiber web layer laid in step S3 is stretched.

[0058] S7. The fiber web layer that has undergone stretching in step S4 is subjected to hydroentangling to obtain the primary filler.

[0059] S8. The primary filler is subjected to heat crosslinking treatment to obtain the intermediate filler;

[0060] S9. The intermediate filler that has been heat-crosslinked in step S7 is dried and wound up to obtain nanofiber blended cotton spunlace filler.

[0061] Specifically, in step S1, the organic solvent is one or more of formic acid, tetrahydrofuran, dimethylformamide, dimethylacetamide, acetone, chloroform, cresol, methanol, ethanol, isobutanol, and toluene.

[0062] Specifically, in step S1, the relative molecular mass of PU is 9300.

[0063] Specifically, in step S1, the concentration of spinning solution A is 18-22 wt%; the concentration of spinning solution B is 16-20 wt%; the mass ratio of PPSU to PU is 4:1; and the mass ratio of spinning solution A to spinning solution B in spinning solution C is 1.5-0.7:1.

[0064] Specifically, in step S2, the cylinder speed of the carding machine is 50-60 Hz, the linear speed of the cylinder and doffer is 1.5-2, and the roller speed is 25 Hz.

[0065] Specifically, in step S4, the electrospinning process parameters are as follows: the applied voltage for electrospinning is 30-50KV, the receiving distance is 20-30cm, the spinning temperature is 20-30℃, and the relative humidity is 70-80%.

[0066] Specifically, in step S4, the mass ratio of PPSU / PU / PA micro / nanofibers to cotton fibers is 1:15-1:20.

[0067] Specifically, in step S5, the weight of a single layer of fiber web is 10-20g, and the number of web layers is 4-6.

[0068] Specifically, in step S7, when hydroentanglement is performed on the product after web laying, four hydroentanglement heads are used to hydroentangle the product after web laying, and the hydroentanglement pressures of the four hydroentanglement heads are 5 bar, 5 bar, 15 bar and 15 bar respectively.

[0069] Specifically, in step S8, the heating crosslinking temperature is 130-150℃, and the time is 2-6 min. In step S8, the drying temperature is 110-130℃, and the time is 1-3 min; the winding speed is 20 m / min.

[0070] Meanwhile, the following embodiments further illustrate the flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling material of the present invention.

[0071] I. Sources of raw materials used in the examples:

[0072] Polyphenylene sulfone resin (PPSU, D-3000) Solvay, Inc., USA; Polyurethane (PU, Mw = 93,000) Huntsman Polyurethanes (China) Co., Ltd.; End-capped isocyanate (BIP) Shanghai Zelong Chemical Co., Ltd.; N,N-dimethylacetamide (DMAc) Aladdin Co., Ltd., China; Polyamide-imide (PAI, Mw = 100,000) Huntsman Polyurethanes (China) Co., Ltd.; Lithium chloride (LiCl) Aladdin Co., Ltd., China.

[0073] II. Testing Standards and Methods

[0074] (1) Thermal insulation performance test: Thermal insulation performance can be characterized by the magnitude of thermal conductivity. The test was conducted using a TPS-2500S thermal constant analyzer.

[0075] (2) Vertical burning test: The vertical burning test was carried out in accordance with the method specified in standard GB / T 5455-2014. The instrument used was model M601-Ⅱ.

[0076] (3) Wash resistance test: Refer to standard GB / T 3921-2008.

[0077] III. Specific Production Process

[0078] Example 1:

[0079] A production process for a flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling includes the following steps:

[0080] S1. Dissolve PPSU and PU (PU relative molecular mass is 9300, PPSU to PU feed mass ratio is 4:1) in tetrahydrofuran, add BIP and stir until dissolved to obtain spinning solution A (concentration is 18wt%); under low humidity environment (e.g., humidity is 25%), add LiCl to tetrahydrofuran and stir until dissolved, then add PAI and stir at room temperature to obtain spinning solution B (concentration is 16wt%); mix spinning solution A and spinning solution B in a certain proportion to obtain spinning solution C;

[0081] S2. The prepared pure cotton raw material is combed using a carding machine to form a cotton fiber web output; the cylinder speed of the carding machine is 50-60 Hz, the linear speed of the cylinder and doffer is 1.5-2, and the roller speed is 25 Hz.

[0082] S3. Lay the cotton fiber web;

[0083] S4. During the web-laying stage, an electrospinning device is installed above the cross-laying machine to perform electrospinning in a high-humidity environment, embedding PPSU / PU / PA micro / nanofibers into the cotton fiber web to obtain a PPSU / PU / PAI monofiber layer. The electrospinning operating parameters are: applied voltage of 30-50KV, receiving distance of 20-30cm, spinning temperature of 20-30℃, and relative humidity of 70-80%. The mass ratio of PPSU / PU / PA micro / nanofibers to cotton monofibers is 1:15, and the diameter of the PPSU / PU / PA micro / nanofibers is 50nm.

[0084] S5. Overlap the PPSU / PU / PAI single fiber layers to form an overlapping fiber web layer;

[0085] S6. The fiber web layer laid in step S3 is stretched.

[0086] S7. The fiber web layer that has been stretched in step S4 is subjected to hydroentangling to obtain the primary filler. During the hydroentangling process, four hydroentangling heads are used to hydroentangle the web-laid product. The hydroentangling pressures of the four hydroentangling heads are 5 bar, 5 bar, 15 bar, and 15 bar, respectively.

[0087] S8. The primary filler is subjected to a heating crosslinking treatment at a temperature of 130-150℃ for 2-6 minutes to obtain the intermediate filler.

[0088] S9. The intermediate filler that has been heat-crosslinked in step S7 is dried at a temperature of 110-130℃ for 1-3 minutes; then it is wound up at a speed of 20m / min to obtain nanofiber blended cotton spunlace filler.

[0089] IV. Test Results

[0090] Example 1

[0091] The ratio of spinning solution A to spinning solution B is 1.5:1. Other steps and parameters are performed according to Example 1.

[0092] Example 2

[0093] The ratio of spinning solution A to spinning solution B is 0.7:1. Other steps and parameters are performed according to Example 1.

[0094] In the above embodiments, the PPSU material has a melting point of 180-220℃, and the PAI material has a melting point of 250-300℃;

[0095] Comparative Example 1

[0096] There is no electrospinning device. The steps are S2, S3, S5, S6, S7, and S9. Steps S5 and S7 remove the micro / nanofibers (PPSU / PU / PA micro / nanofibers are not added). Other steps and parameters are performed according to Example 1.

[0097] Comparative Example 2: An electrospinning device was used, but PAI was not added. The steps were the same as in Example 2.

[0098] Comparative Example 3: An electrospinning device was used, PAI was added, and the steps were the same as in Example 2, with a crosslinking temperature of 180-220℃.

[0099] The fillers prepared in Examples 1-2 and Comparative Examples 1-3 were subjected to performance testing, and the test results are summarized in Tables 1, 2, and 3 below.

[0100] (1) Wash fastness test and post-wash condition test

[0101] Table 1

[0102] Example 1 Level 4-5 No abnormal changes Example 2 Level 4-5 No abnormal changes Comparative Example 1 Level 1-2 Fiber clumps, yellow water after washing Comparative Example 2 Level 4-5 No abnormal changes Comparative Example 3 Level 1-2 The fiber clumps are compacted and hardened in some areas.

[0103] (2) Vertical burning test (flame retardancy)

[0104] Table 2

[0105]

[0106] As can be seen from Table 2 above, Example 2 exhibits excellent flame retardant performance. Within the ignition time (12s), the flame will quickly self-extinguish and will not spread. The afterflame time and smoldering time are both short, and the combustion process will not produce a large amount of smoke particles. The final average damage length is 75mm, which has good safety.

[0107] (3) Thermal conductivity test (heat retention rate)

[0108] Table 3

[0109]

[0110] As shown in Table 3 above, Example 1 exhibits excellent thermal insulation performance. For the same volume, Example 1 has a lower bulk density, higher porosity, and lowest thermal conductivity, demonstrating lightweight and thermal insulation properties. Comparing Example 1 with Comparative Example 2 reveals that the addition of PAI to the micro / nanofiber has little impact on the thermal insulation rate of the filler.

[0111] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A flame-retardant, fluffy, and warm nanofiber blended with spunlace cotton filling, characterized in that, Including overlapping PPSU / PU / PAI monofiber layers; The PPSU / PU / PAI single fiber layer is obtained by embedding PPSU / PU / PAI micro / nano fibers into a cotton fiber web; the mass ratio of the PPSU / PU / PAI micro / nano fibers to the cotton fiber web is 1:

15. The production process of the flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling includes the following steps: S1. Dissolve PPSU and PU in an organic solvent, add BIP and stir until dissolved to obtain spinning solution A; add LiCl to the organic solvent under low humidity and stir until dissolved, then add PAI and stir at room temperature to obtain spinning solution B; mix spinning solution A and spinning solution B to obtain spinning solution C. S2. The prepared pure cotton raw materials are combed to form a cotton fiber web for output; S3. Lay the cotton fiber web; S4. During the web laying stage, an electrospinning device is installed above the cross-web laying machine to perform electrospinning in a high-humidity environment, embedding PPSU / PU / PAI micro / nano fibers into the cotton fiber web to obtain a PPSU / PU / PAI single fiber layer. S5. Overlap the PPSU / PU / PAI single fiber layers to form an overlapping fiber web layer; S6. The fiber web layer laid in step S5 is stretched. S7. The fiber web layer that has undergone stretching in step S6 is subjected to hydroentangling to obtain the primary filler. S8. The primary filler is subjected to a heat crosslinking treatment to obtain the intermediate filler; the heat crosslinking temperature is 130-150℃ and the time is 2-6 min. S9. The intermediate filler that has been heat-crosslinked in step S8 is dried to obtain nanofiber blended cotton spunlace filler. The concentration of spinning solution A is 18 wt%; the concentration of spinning solution B is 16 wt%; the mass ratio of PPSU to PU is 4:1; the mass ratio of spinning solution A to spinning solution B in spinning solution C is 1.5:

1.

2. The flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling material according to claim 1, characterized in that, The weight of the PPSU / PU / PAI single fiber layer is 10-20g, and the number of overlapping web layers is 4-6.

3. The flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling material according to claim 1, characterized in that, The electrospinning voltage is 30-50KV, the receiving distance is 20-30cm, the spinning temperature is 20-30℃, and the relative humidity is 70-80%.

4. The flame-retardant, fluffy, and warm nanofiber blended cotton spunlace filling material according to claim 1, characterized in that, In step S2, a carding machine is used for carding, and the roller speed of the carding machine is 25 Hz.

5. The production process of the flame-retardant, fluffy, warm nanofiber blended cotton spunlace filling material according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Dissolve PPSU and PU in an organic solvent, add BIP and stir until dissolved to obtain spinning solution A; add LiCl to the organic solvent under low humidity and stir until dissolved, then add PAI and stir at room temperature to obtain spinning solution B; mix spinning solution A and spinning solution B to obtain spinning solution C. S2. The prepared pure cotton raw materials are combed to form a cotton fiber web for output; S3. Lay the cotton fiber web; S4. During the web laying stage, an electrospinning device is installed above the cross-web laying machine to perform electrospinning in a high-humidity environment, embedding PPSU / PU / PAI micro / nano fibers into the cotton fiber web to obtain a PPSU / PU / PAI single fiber layer. S5. Overlap the PPSU / PU / PAI single fiber layers to form an overlapping fiber web layer; S6. The fiber web layer laid in step S5 is stretched. S7. The fiber web layer that has undergone stretching in step S6 is subjected to hydroentangling to obtain the primary filler. S8. The primary filler is subjected to a heat crosslinking treatment to obtain the intermediate filler; the heat crosslinking temperature is 130-150℃ and the time is 2-6 min. S9. The intermediate filler that has been heat-crosslinked in step S8 is dried to obtain nanofiber blended cotton spunlace filler.

6. The production process according to claim 5, characterized in that, In step S7, when hydroentanglement is performed on the drawn product, four hydroentanglement heads are used to hydroentangle the web-laid product. The hydroentanglement pressures of the four hydroentanglement heads are 5 bar, 5 bar, 15 bar, and 15 bar, respectively.

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