Down feather warm-keeping filling sheet and preparation method thereof

Abstract

The invention provides a down warm-keeping filling sheet and a preparation method thereof, the preparation method adopts acrylic fibers as an inner layer fabric and an outer layer fabric, the two layers of acrylic fibers are subjected to hot pressing to form a pocket, the pocket is filled with a mixture of duck down and aerogel powder as a filling layer, and the down warm-keeping flocculus is obtained. Then, firstly, the aerogel powder is uniformly dispersed into down flowers and among the down flowers through roller rotation treatment; then, a corona polarization method is adopted, the down feather warm-keeping flocculus is treated through a high-voltage electrostatic electret, the aerogel powder is charged, after the aerogel powder approaches down filaments of the down feather, the down filaments are induced to be electrified, and the internal aerogel powder is adsorbed into the down feather, namely the surfaces of the down filaments under the action of an electrostatic field; and finally, carrying out frictional electrification on the down feather warm-keeping flocculus by utilizing an electrostatic roller friction machine. The down feather is stable in structure and can support the effective space in the down jacket, the aerogel powder is adsorbed into down flowers of the down feather under the electrostatic action, and the heat preservation performance of the clothes is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation textiles, and in particular to a down thermal insulation filling sheet and a preparation method thereof. Background Art

[0002] Down jackets are one of the most commonly used winter clothing. They are usually divided into two types: light down jackets and extreme cold down jackets. Down jackets are often made thicker to increase their warmth retention, so they cannot meet people's current demand for lightweight, simple and convenient clothing.

[0003] Aerogel is a three-dimensional nanoporous material with a porosity of more than 90% and a density as low as 0.002 g / cm 3 , is the lowest density solid so far. Its thermal conductivity is as low as 0.013-0.018W / (m·K), close to the thermal conductivity of still air. It is a solid material with good warmth retention effect, and its powder is light and fine.

[0004] The patent with application number CN 202211172008.7 discloses an aerogel modified down fabric. The solution mixes crushed silica aerogel, nano-silicon dioxide and adhesive to obtain a coating, and then applies the coating to the surface of modified glass fiber through a textile coating finishing machine to obtain a filling layer of down fabric, and then uses nylon and polyester to coat the filling layer. The mechanical properties of the aerogel are improved by modifying the glass fiber. According to the international standard test of ASTMD1518-2014 "Cotton System Thermal Resistance Test Method (Hot Plate Method)", the thermal conductivity is 1.5W / m 2 ·K, the warmth retention of the test sample before and after washing. However, the glass fiber is hard and has poor comfort when used in clothing. The preparation method is too complicated and not suitable for large-scale production and actual use.

[0005] The patent with application number CN 202211113065.8 discloses a down jacket with aerogel thermal shell fluff fabric and its preparation method. The preparation method adds aerogel powder to the modified porous fiber spinning solution, and then obtains aerogel thermal insulation fiber through the spinneret, and then soaks the fabric woven from the aerogel thermal insulation fiber in a phenolic resin solution, and then naturally dries to obtain an aerogel thermal insulation fiber layer, thereby fully utilizing the aerogel powder. The disadvantage is that the mechanical properties of the fabric are poor, the moisture permeability and air permeability of the clothing are poor, and it is difficult to avoid a certain degree of damage to the aerogel during the spinning process.

[0006] The patent with application number CN 201910217734.8 discloses an aerogel-modified down material and its products. The aerogel-modified down material includes down, aerogel powder and an anti-powder-dropping structure. The anti-powder-dropping structure confines the aerogel powder on the down, avoiding the aerogel powder from dropping during use. The disadvantage is that the use of adhesives will affect the fluffiness of the down and the use of adhesives will cause the infiltration of polymer macromolecules in some aerogel pores, thereby affecting the air content inside the aerogel and reducing its warmth-keeping effect.

[0007] In view of this, it is necessary to design a down thermal insulation filling sheet and a preparation method thereof to solve the above problems. Summary of the invention

[0008] In view of the technical problems existing in the background technology, the present application provides a down thermal insulation filling sheet and a preparation method thereof. The preparation method uses acrylic as the inner and outer fabrics, hot presses the two layers of acrylic fabrics to form pockets, and fills the pockets with a mixture of duck down and aerogel powder as a filling layer to obtain a down thermal insulation wadding. Then, the aerogel powder is evenly dispersed into the interior and between the down tufts by roller rotation treatment; then, the corona polarization method is used to treat the down thermal insulation wadding by high-voltage electrostatic electret treatment to charge the aerogel powder. After it approaches the down tufts, the tufts are inductively charged, so that the internal aerogel powder is adsorbed to the interior of the down, that is, the surface of the tufts under the action of the electrostatic field; finally, the down thermal insulation wadding is frictionally charged by an electrostatic roller friction machine. The aerogel powder is light in weight and small in particle size. Under the action of electrostatics, it will be adsorbed into the tufts of the down by the down. The structure of the down is stable and can support the effective space in the down jacket. The aerogel powder can be evenly dispersed and adsorbed by static electricity, thereby providing the clothing with better thermal insulation performance.

[0009] In a first aspect, an embodiment of the present application provides a method for preparing a down thermal insulation filling sheet, comprising the following steps:

[0010] S1, hot pressing two layers of acrylic fabric to form a plurality of pocket-shaped filling areas arranged in a grid pattern; gaps are reserved in the filling areas for filling duck down and aerogel powder, and after the duck down and aerogel powder are filled, the gaps are hot pressed and sealed to obtain down warming flakes for standby use;

[0011] S2, putting the down warming flakes obtained in step S1 into a drum, and rotating the drum to evenly disperse the aerogel powder inside and between the down tufts; wherein the rotation speed is 45-50r / min, and the rotation time is 15-30min;

[0012] S3, using a high-voltage electrostatic electret device to process the down warming flakes obtained in step S2, with the charging voltage set to 2-6 kV; so that the aerogel powder carries an electric charge, and when the aerogel powder approaches the down fibers, the down fibers are inductively charged, so that the aerogel powder is adsorbed to the inside of the down, i.e., the surface of the down fibers, under the action of the electrostatic field;

[0013] S4, using an electrostatic drum friction machine to frictionally charge the down thermal insulation flocculant obtained in step S3, setting the temperature to 45-60°C, the time to 15-30min, and the speed to 45-50r / min; through the action of external force, the down and acrylic fiber are efficiently rubbed, thereby quickly generating an electrostatic field, and enhancing the adsorption and dispersion of the aerogel powder inside the down thermal insulation filling sheet.

[0014] Furthermore, the mass ratio of the down to the aerogel powder is 4:(1-5).

[0015] Furthermore, the aerogel powder is made of hydrophobic silica aerogel, with a particle size range of 0.1-10 μm, a porosity of 90%-95%, and a pore size range of 15nm-30nm.

[0016] Furthermore, in step S1, the hot pressing temperature is 320°C.

[0017] Furthermore, the down is made of white duck down, with a fluffiness of 16-17 cm and a down content of 95%.

[0018] In the second aspect, an embodiment of the present application also provides a down thermal filling sheet, which is prepared by the preparation method described in the aforementioned technical scheme, wherein the down thermal filling sheet comprises an inner layer, an outer layer, and a filling layer, wherein the filling layer is located in a cavity between the outer layer and the inner layer, and the filling layer is a mixture of down and aerogel powder, and the charge of the down thermal filling sheet is 0.13-0.17 μC.

[0019] Furthermore, the mass ratio of the down to the aerogel powder is 4:(1-5).

[0020] Furthermore, the fabrics of the inner layer and the outer layer are both acrylic.

[0021] The beneficial effects of the present invention are:

[0022] 1. In the present invention, in the filling layer, the outermost surface of the down fiber is a cell membrane, which is composed of a bilayer membrane of sterol and triphosphate, both of which are difficult to dissolve in water. Therefore, the down has excellent hydrophobic properties and is prone to lose electrons and is positively charged in the electrostatic sequence table; the outer and inner acrylic fabrics are distributed on the right side of the down in the electrostatic sequence table, and the difference in the ability to gain and lose charge between the two is large. Friction will definitely occur during the wearing and use of the clothes. The friction between the down fiber and the outer and inner acrylic fabrics will generate static electricity to continuously provide a stable static source.

[0023] 2. In the present invention, high-voltage electret treatment is used to treat the sample, so that it actively generates charges and initially forms an electrostatic field. The sample is then treated by friction charging. Through the synergistic effect of the above two forms, the aerogel powder is adsorbed on the surface of the down fibers under the action of the electrostatic field and thus evenly dispersed. In addition, the static electricity generated by the friction between the acrylic fiber and the down during subsequent use is used to maintain the stability of the electrostatic field, thereby maintaining the stable thermal insulation structure formed by the combination of the aerogel powder and the down.

[0024] 3. In the present invention, the aerogel powder is light in weight and small in particle size. It will be adsorbed into the down clumps by the down under the action of static electricity. The structure of the down is stable and can support the effective space in the down jacket. The aerogel powder can be evenly dispersed and adsorbed by static electricity, thereby providing the clothing with better thermal insulation performance. On this basis, the amount of down can be reduced, the thickness of the down jacket can be reduced, and the aerogel powder distributed in the aerogel powder can be used to make up for the reduced warmth retention effect due to the reduction of down.

[0025] 4. In the present invention, the filling area is sealed by hot pressing. The melting point of acrylic fiber is 317°C. The hot pressing temperature of 320°C can effectively ensure the bonding of the two fibers, thereby effectively ensuring that the aerogel powder does not leak.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic structural diagram of the down thermal insulation filling sheet prepared in the present invention.

[0029] Figure 2 This is a diagram showing the state of aerogel powder electrostatically adsorbing down.

[0030] Figure 3 Schematic diagram of the distribution of filling area and hot pressing area. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] Although the aerogel powder is confined to the down using an adhesive, it can avoid the aerogel powder from falling off during use. However, the use of adhesive will affect the fluffiness of the down and cause the infiltration of polymer macromolecules in some aerogel pores, thereby affecting the air content inside the aerogel and reducing its warmth retention effect.

[0039] See also Figures 1 to 3 As shown, the embodiment of the present application provides a method for preparing a down thermal insulation filling sheet, comprising the following steps:

[0040] S1, hot pressing two layers of acrylic fabric to form a plurality of pocket-shaped filling areas arranged in a grid pattern; gaps are reserved in the filling areas for filling duck down and aerogel powder, and after the duck down and aerogel powder are filled, the gaps are hot pressed and sealed to obtain down warming flakes for standby use;

[0041] The mass ratio of down to aerogel powder is 4:(1-5).

[0042] The hot pressing temperature is 320°C. The hot pressing method is used to seal the filling area. The melting point of acrylic fiber is 317°C. The hot pressing temperature of 320°C can effectively ensure the bonding of the two fibers, thereby effectively ensuring that the aerogel powder does not leak.

[0043] The down is made of white duck down with a fluffiness of 16-17cm and a down content of 95%.

[0044] The aerogel powder adopts hydrophobic silica aerogel, with a particle size range of 0.1-10 μm, a porosity of 90%-95%, and a pore size range of 15nm-30nm.

[0045] S2, putting the down warm-keeping flakes obtained in step S1 into a drum, rotating the drum, and using mechanical force to ensure that the aerogel powder is evenly dispersed inside and between the down tufts, and the two are evenly mixed; wherein the rotation speed is 45-50r / min, and the rotation is 15-30min;

[0046] S3, using a high-voltage electrostatic electret device to process the down warming wadding obtained in step S2, with the charging voltage set to 2-6 kV; the high-voltage charging stage charges the aerogel powder, and when it approaches the down fibers, the down fibers are inductively charged, so that the aerogel powder is adsorbed to the inside of the down, i.e., the surface of the down fibers, under the action of the electrostatic field;

[0047] S4, using an electrostatic drum friction machine to frictionally charge the down thermal insulation flocculant obtained in step S3, setting the temperature to 45-60°C, the time to 15-30min, and the speed to 45-50r / min; through the action of external force, the down and acrylic fiber are efficiently rubbed, thereby quickly generating an electrostatic field, and enhancing the adsorption and dispersion of the aerogel powder inside the down thermal insulation filling sheet.

[0048] In the present application, the outermost surface of the down fiber is a cell membrane, which is composed of a bilayer membrane of sterol and triphosphate, both of which are insoluble in water. Therefore, the down has excellent hydrophobic properties and is prone to losing electrons and is positively charged in the electrostatic sequence table. Acrylic fiber is selected as the outer and inner layer fabrics. The acrylic fiber fabric is distributed on the right side of the down in the electrostatic sequence table. The two have a large difference in their ability to gain and lose charge. Friction will definitely occur during the wearing and use of the clothes, and friction will definitely generate static electricity, thereby providing a stable source of static electricity.

[0049] In the present application, the mechanical force of the drum rotation is first used to ensure that the aerogel powder is evenly dispersed inside and between the down tufts, and the two are evenly mixed; then the corona polarization method is used to treat the down thermal insulation flakes through a high-voltage electrostatic electret device, so that the aerogel powder carries an electric charge. When it approaches the down filaments, the down filaments are inductively charged, so that the internal aerogel powder is adsorbed to the inside of the down, that is, the surface of the down filaments under the action of the electrostatic field; finally, the down thermal insulation flakes are frictionally charged using an electrostatic drum friction machine. The aerogel powder is light in weight and small in particle size. Under the action of static electricity, it will be adsorbed into the down tufts of the down. The structure of the down is stable and can support the effective space in the down jacket. The aerogel powder can be evenly dispersed and adsorbed by static electricity, thereby providing the clothing with better thermal insulation performance.

[0050] In the second aspect, the embodiment of the present application provides a down thermal insulation filling sheet, which is prepared by the above-mentioned preparation method, and the prepared down thermal insulation filling sheet includes an inner layer 1, an outer layer 2 and a filling layer. The filling layer 5 is located in the cavity between the outer layer 2 and the inner layer 1, and the filling layer is a mixture of down 6 and aerogel powder 3. The inner layer 1 and the outer layer 2 fabrics are hot pressed to form a plurality of pocket-shaped filling areas arranged in a grid shape. Adjacent filling areas are connected by hot pressing strips 4.

[0051] The mass ratio of down 6 to aerogel powder 3 is 4:(1-5).

[0052] The down is made of white duck down with a fluffiness of 16-17cm and a down content of 95%.

[0053] The aerogel powder adopts hydrophobic silicon dioxide aerogel, the particle size range is 0.1-10 μm, and the porosity reaches 90% to 95%.

[0054] The charge of the down thermal insulation filling sheet is 0.13-0.17 μC; after being washed five times, the clo value of the down thermal insulation filling sheet is 1.57 clo, which is only reduced by 0.01 clo.

[0055] Some specific embodiments are listed below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0056] Example 1

[0057] This embodiment provides a method for preparing a down thermal insulation filling sheet, comprising the following steps:

[0058] S1, hot pressing two layers of acrylic fabric to form a number of pocket-shaped filling areas arranged in a grid pattern; gaps are reserved in the filling areas for filling with duck down and aerogel powder, and after the duck down and aerogel powder are filled, the gaps are hot pressed and sealed to obtain down thermal insulation flakes for use; wherein the mass ratio of down to aerogel powder is 4:2.

[0059] The down is made of white duck down with a fluffiness of 17cm and a down content of 95%. The aerogel powder is made of hydrophobic silica aerogel with a particle size of 0.1-10μm, a porosity of 90% to 95%, and a pore size of 15nm to 30nm.

[0060] The filling area was sealed by hot pressing, and the hot pressing temperature was set to 320°C.

[0061] S2, putting the down warm-keeping flakes obtained in step S1 into a drum, and rotating the drum to evenly disperse the aerogel powder inside and between the down tufts; wherein the rotation speed is 50 r / min, and the drum rotates for 30 min;

[0062] S3, using a high-voltage electrostatic electret device to process the down warming wadding obtained in step S2, with the charging voltage set to 4kV; the high-voltage charging stage charges the aerogel powder, and when it approaches the down fibers, the down fibers are inductively charged, so that the aerogel powder is adsorbed to the inside of the down, i.e., the surface of the down fibers, under the action of the electrostatic field;

[0063] S4, using an electrostatic drum friction machine to frictionally charge the down thermal insulation flocculant obtained in step S3, setting the temperature to 60°C, the time to 30 minutes, and the speed to 50 r / min; through the action of external force, the down and acrylic fiber are efficiently rubbed, thereby quickly generating an electrostatic field, and enhancing the adsorption and dispersion of the aerogel powder inside the down thermal insulation filling sheet.

[0064] Examples 2-5 and Comparative Example 1

[0065] Examples 2-5 and Comparative Example 1 provide a method for preparing a down thermal insulation filling sheet, which is different from Example 1 in that the mass ratio of down to aerogel powder in step S1 is changed, as shown in the following table. The rest is roughly the same as Example 1 and will not be repeated here.

[0066] Mass ratio of down to aerogel powder Example 1 4：2 Example 2 4：1 Example 3 4：3 Example 4 4：4 Example 5 4：5 Comparative Example 1 4：6

[0067] Example 6

[0068] Example 6 provides a method for preparing a down thermal filling sheet. Compared with Example 1, the difference is that the fluffiness of the down used is 16 cm, and the rest is roughly the same as Example 1, which will not be repeated here.

[0069] Comparative Example 2

[0070] Comparative Example 2 provides a method for preparing a down thermal filling sheet. Compared with Example 1, the difference is that no aerogel powder is used, that is, the filling area is not filled with aerogel powder, only down, and the rest is roughly the same as Example 1, which will not be repeated here.

[0071] Comparative Example 3

[0072] Comparative Example 3 provides a method for preparing a down thermal filling sheet. Compared with Example 1, the difference is that the fabric is replaced by nylon instead of acrylic fiber, and the rest is roughly the same as Example 1, which will not be repeated here.

[0073] Comparative Example 4

[0074] Comparative Example 4 provides a method for preparing a down thermal filling sheet. Compared with Example 1, the difference is that the down is replaced by a cotton sheet, and the rest is roughly the same as Example 1, which will not be repeated here.

[0075] Comparative Example 5

[0076] Comparative Example 5 provides a method for preparing a down thermal insulation filling sheet. Compared with Example 1, the difference is that step S2 is not performed, and the rest is roughly the same as Example 1, which will not be repeated here.

[0077] Comparative Example 6

[0078] Comparative Example 6 provides a method for preparing a down thermal filling sheet. Compared with Example 1, the difference is that step S3 is not performed, and the rest is roughly the same as Example 1, which will not be repeated here.

[0079] Comparative Example 7

[0080] Comparative Example 7 provides a method for preparing a down thermal insulation filling sheet. Compared with Example 1, the difference is that step S4 is not performed, and the rest is roughly the same as Example 1, which will not be repeated here.

[0081] The following performance tests were performed on the down thermal insulation filling sheet samples of each embodiment and comparative example. The test results are shown in Table 1. The specific test steps are as follows:

[0082] Referring to the relevant standards in GB / T 3820-1997, "Determination of thickness of textiles and textile products", the thickness of the samples was tested using a nonwoven fabric thickness tester (Ningbo Textile Instrument Co., Ltd.), with a relative humidity of 65±4.0% and a temperature of 20±2.0°C. The reading was to 0.5mm during the test, and each sample was tested 10 times to take the average value.

[0083] According to the relevant standards in GB / T 11048-2018 "Determination of thermal resistance and moisture resistance of textiles under steady-state conditions of physiological comfort (evaporative hot plate method)", the YG-606D flat-plate fabric insulation instrument (Ningbo Textile Instrument Co., Ltd.) was used to test the thermal insulation performance of the sample. The humidity was adjusted for 24 hours in a climate room with an air humidity of 65±3.0%, a temperature of 20±0.5℃, and an air flow rate of no more than 0.1m / s. Each sample was tested 3 times in this climate room using the flat plate method, and the average value was taken to test the Krogh value of the sample.

[0084] Referring to the relevant standards in GB / T 8629-2017 "Household Washing and Drying Procedures for Textile Testing", all samples were tested for washing using a Y(B)089E fully automatic shrinkage testing machine (Wenzhou Darong Textile Instrument Co., Ltd.). The washing program was set to 4N standard washing mode, the number of washing cycles was 1, the dehydration rate was set to 500 rpm, 100% polyester fiber fabric was selected as the wash fabric, the mass ratio of the sample to the wash fabric was 1:1, and the detergent was standard detergent 3 (ECE standard detergent 98).

[0085] Refer to the relevant standards in JJF (Textile) 071-2016 "Textile Friction Charge Density Tester (Faraday Cylinder Method)". The sample is humidified for 24 hours under the environmental conditions of relative humidity 35±5.0% and temperature 20±2.0℃, and the test is carried out in this environment. After the sample friction is completed, it is immediately put into the Faraday cylinder. Each sample is tested 5 times and the average value is taken.

[0086]

[0087] As can be seen from Table 1, the down thermal insulation filling sheet of the embodiment of the present invention has better thermal insulation performance than the comparative product. Compared with comparative example 2, Examples 1-6 have a thinner thickness, a more stable electrostatic field, and better water washability than comparative example 3. This shows that the electrostatic field generated by the friction between acrylic fiber and down has a significant dispersion effect on the aerogel powder, and the hydrophobic aerogel powder makes full use of the internal space of the filling sheet, improving the thermal insulation effect per unit space. At the same time, its hydrophobic property improves the water washability of the down thermal insulation filling sheet.

[0088] Specifically, when the mass ratio of down to aerogel powder exceeds the range of 4:(1-5) and is 4:6 (Comparative Example 1), the sample's Crowe value decreases, the thermal insulation performance decreases, and the thickness decreases. This is because the continuous increase in the amount of aerogel powder filling causes excessive aerogel powder to fill a limited space, causing the entire down to be squeezed, the amount of static air contained to decrease, and the Crowe value decreases accordingly.

[0089] When aerogel powder is not added (Comparative Example 2), the sample has a smaller Kroger value, a larger thickness, and a significantly reduced thermal insulation performance after five washes. This is because the down is fluffy and a large number of down is filled in a confined space, resulting in a higher overall thickness of the sample. However, due to the large gaps between the down and the down fibers, air molecules can move normally, resulting in increased thermal convection, and a smaller overall Kroger value. After multiple washes, the hydrophobic lipids on the surface of the down are destroyed, the hydrophobic performance is reduced, and the fluffy effect is affected, resulting in a reduction in thermal insulation performance.

[0090] When the fabric is replaced with nylon (Comparative Example 3), the sample has a lower charge and the overall electrostatic field is unstable. This is because nylon and down are close in the electrostatic sequence table, and the friction between the two cannot effectively generate electric charge, which leads to the inability of aerogel powder to disperse evenly and effectively, and is not conducive to its stable adsorption on the down.

[0091] When the down is replaced with cotton wool (Comparative Example 4), the sample has a lower Kroger value, a lower charge, and a significantly reduced Kroger value after 5 washes. This is because cotton fibers are long strips, have a higher thermal conductivity, and are not as good as down in terms of warmth retention, have a higher moisture regain, are easy to shrink after washing, and have a reduced fluffiness after multiple washes. In addition, cotton and acrylic fibers are close in the electrostatic sequence table, so friction is not easy to charge, the electrostatic field is unstable, and cannot effectively adsorb and disperse with aerogel powder, so the overall warmth retention effect is poor.

[0092] When rolling mixing is not performed (Comparative Example 5), the down and aerogel powder inside the sample are not pre-dispersed, resulting in aggregation of the aerogel powder inside the sample. The agglomeration phenomenon between the powders leads to poor overall uniformity of the sample, a low Crowe value, and poor thermal insulation.

[0093] When electrostatic charging treatment is not performed (Comparative Example 6), the acrylic fiber on the surface of the sample and the down and aerogel powder inside cannot be charged by high voltage, and the aerogel powder cannot be electrostatically adsorbed by a stable electrostatic field, and is unevenly dispersed. Therefore, the thermal convection of the sample increases, the Crowe value is small, and the warmth retention is poor.

[0094] When friction charging treatment is not performed (Comparative Example 7), the charge carried by the sample through the high-voltage charging stage is not further continued, resulting in the inability of the electrostatic field inside the sample to function stably, the overall charge of the sample is reduced, the Crowe value is reduced, and the warming effect is poor.

[0095] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and the same effect as the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for preparing a down thermal insulation filling sheet, characterized in that: The following steps are involved: S1, hot pressing two layers of acrylic fabric to form a plurality of pocket-shaped filling areas arranged in a grid pattern; gaps are reserved in the filling areas for filling duck down and aerogel powder, and after the duck down and aerogel powder are filled, the gaps are hot pressed and sealed to obtain down warming flakes for standby use; S2, putting the down warming flakes obtained in step S1 into a drum, and rotating the drum to evenly disperse the aerogel powder inside and between the down tufts; wherein the rotation speed is 45-50r / min, and the rotation time is 15-30min; S3, using a high-voltage electrostatic electret device to process the down warming flakes obtained in step S2, with the charging voltage set to 2-6 kV; so that the aerogel powder carries an electric charge, and when the aerogel powder approaches the down fibers, the down fibers are inductively charged, so that the aerogel powder is adsorbed to the inside of the down, i.e., the surface of the down fibers, under the action of the electrostatic field; S4, using an electrostatic drum friction machine to frictionally charge the down thermal insulation flocculant obtained in step S3, setting the temperature to 45-60°C, the time to 15-30min, and the speed to 45-50r / min; through the action of external force, the down and acrylic fiber are efficiently rubbed, thereby quickly generating an electrostatic field, and enhancing the adsorption and dispersion of the aerogel powder inside the down thermal insulation filling sheet.

2. The method for preparing the down thermal insulation filling sheet according to claim 1, characterized in that: The mass ratio of the down to the aerogel powder is 4:(1-5).

3. The method for preparing the down thermal insulation filling sheet according to claim 1, characterized in that: The aerogel powder is made of hydrophobic silicon dioxide aerogel, with a particle size range of 0.1-10 μm, a porosity of 90%-95%, and a pore size range of 15nm-30nm.

4. The method for preparing the down thermal insulation filling sheet according to claim 1, characterized in that: In step S1, the hot pressing temperature is 320°C.

5. The method for preparing the down thermal insulation filling sheet according to claim 1, characterized in that: The down is white duck down with a fluffiness of 16-17 cm and a down content of 95%.

6. A down warm filling sheet, characterized in that: The down thermal insulation filling sheet is prepared by the preparation method described in any one of claims 1-5, comprising an inner layer, an outer layer, and a filling layer, wherein the filling layer is located in a cavity between the outer layer and the inner layer, and the filling layer is a mixture of down and aerogel powder, and the charge of the down thermal insulation filling sheet is 0.13-0.17 μC.

7. The down thermal insulation filling sheet according to claim 6, characterized in that: The mass ratio of the down to the aerogel powder is 4:(1-5).

8. The down thermal insulation filling sheet according to claim 6, characterized in that: The fabrics of the inner layer and the outer layer are both acrylic.

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