An ultralight tear-resistant outdoor fabric and a preparation method thereof

Abstract

The application relates to an ultralight tear-resistant outdoor fabric and a preparation method thereof, and relates to the technical field of garment fabrics.The fabric structure comprises a base cloth, a surface cloth and a nanofiber membrane compounded between the base cloth and the surface cloth; wherein the surface cloth is woven by taking 100% nylon 66 fibers as warp yarns and taking 84-89% nylon 66 fibers compounded with 11-16% polyarylate fibers as weft yarns according to the weight percentage; the base cloth is woven by taking 100% polypropylene fibers as warp yarns and weft yarns according to the weight percentage; and the nanofiber membrane is formed by dispersing surface-modified silicon dioxide aerogel in a polyurethane solution to obtain a spinning solution and then electrospinning the spinning solution on the upper surface of the base cloth. The fabric provided by the application has ultrahigh tear resistance, is light in weight and is more portable, in addition, the fabric has excellent air permeability, moisture permeability and waterproof performance, and has a good application prospect in the field of outdoor garments.

Description

Technical Field

[0001] This invention belongs to the field of clothing fabric technology, specifically relating to an ultralight tear-resistant outdoor fabric and its preparation method. Background Technology

[0002] Outdoor fabrics are generally made from synthetic fibers such as nylon and polyester through post-processing. In addition to meeting the requirements of comfort and durability, they should also have more functions, such as waterproofing, tear resistance, breathability, and lightweight.

[0003] To achieve waterproof properties, most of these clothing fabrics employ high-density weaving combined with coating processes. However, the coating process reduces the original comfort of the fabric, and consequently decreases its breathability and moisture permeability. Furthermore, to ensure the fabric has tear resistance, it is often necessary to develop new fiber materials with superior tear resistance, or to increase the fineness, weaving density, and weight of the fibers during processing. The latter, however, reduces the fabric's lightweight properties. Therefore, to improve the overall performance of outdoor fabrics while ensuring durability and comfort, and to endow outdoor fabrics with more functionality, this invention proposes an ultralight tear-resistant outdoor fabric and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide an ultralight tear-resistant outdoor fabric and its preparation method in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] As a first aspect of the present invention, the present invention provides an ultralight tear-resistant outdoor fabric, the structure of which includes a base fabric, an outer fabric, and a nanofiber membrane composited between the base fabric and the outer fabric.

[0007] The face fabric, by weight percentage, is woven from 100% nylon 66 fiber as warp and 84-89% nylon 66 fiber combined with 11-16% polyaramid fiber as weft; the base fabric, by weight percentage, is woven from 100% polypropylene fiber as both warp and weft; the nanofiber membrane is formed by first dispersing surface-modified silica aerogel in a polyurethane solution to obtain a spinning solution, and then electrospinning the spinning solution onto the upper surface of the base fabric.

[0008] As a further optimization of the present invention, the warp yarn weaving density is 90-110 yarns / cm, the weft yarn weaving density is 75-85 yarns / cm, and the weaving structure is a grid pattern with a width of 0.15cm.

[0009] As a further optimization of the present invention, the surface modifier is a trimethylchlorosilane-ethanol solution with a mass concentration of 0.1-0.5%, and the amount of the surface modifier is 1.5-2.0% of the mass of the silica aerogel.

[0010] As a further optimization of the present invention, the mass of the surface-modified silica aerogel is 10-15% of the mass of the polyurethane.

[0011] As a second aspect of the present invention, the present invention also provides a method for preparing an ultralight tear-resistant outdoor fabric as described in any of the above descriptions, comprising the following steps:

[0012] (1) Preparation of the face fabric: The face fabric is obtained by weaving nylon 66 fiber as warp yarn and nylon 66 fiber composite polyaramid fiber as weft yarn using a fabric weaving machine;

[0013] (2) Preparation of the base fabric: The base fabric is obtained by weaving polypropylene fiber as warp and weft yarns using a warp fabric weaving machine;

[0014] (3) After heat treatment of silica aerogel with surface modifier, surface modified silica aerogel is obtained. Silica aerogel is dispersed in polyurethane solution to obtain spinning solution. The spinning solution is spun onto the upper surface of the base fabric obtained in step (2) by electrospinning to form a nanofiber membrane.

[0015] (4) The bottom fabric with nanofiber membrane on the upper surface obtained in step (3) is laminated with the top fabric obtained in step (1) using a hot melt adhesive laminating machine to obtain the ultralight tear-resistant outdoor fabric.

[0016] As a further optimization of the present invention, step (3) specifically involves mixing the sprayed surface modifier with silica aerogel under vortexing conditions, with a heat treatment temperature of 80-100℃ and a heat treatment time of 30-60 min, and the spray rate of the surface modifier being 0.8-2 ml / s.

[0017] The beneficial effects of this invention are as follows:

[0018] The ultralight tear-resistant outdoor fabric provided by this invention includes a base fabric, an outer fabric, and a nanofiber membrane composited between the base fabric and the outer fabric. The outer fabric is made of nylon 66 warp yarns and nylon 66 weft yarns combined with polyaramid fiber, woven together. Polyaramid fiber has super tear resistance, and its interweaving with nylon 66 fiber gives it high tear strength while keeping the fabric weight low and lightweight. In addition, the nanofiber membrane gives the fabric excellent breathability, moisture permeability, and waterproof performance, making it a promising candidate for application in the field of outdoor clothing. Detailed Implementation

[0019] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Unless otherwise specified, all materials used in the following examples are commercially available.

[0021] Example 1

[0022] This embodiment provides an ultralight tear-resistant outdoor fabric. The structure of the composite fabric includes a base fabric, an outer fabric, and a nanofiber membrane composited between the base fabric and the outer fabric.

[0023] The face fabric is woven from 100% nylon 66 fiber as warp and 84% nylon 66 fiber combined with 16% polyaramid fiber as weft by weight percentage; the base fabric is woven from 100% polypropylene fiber as both warp and weft by weight percentage; the nanofiber membrane is formed by first dispersing surface-modified silica aerogel in a polyurethane solution to obtain a spinning solution, and then electrospinning it onto the upper surface of the base fabric.

[0024] The surface modifier is a 0.1% (w / w) trimethylchlorosilane-ethanol solution, the amount of the surface modifier is 2.0% of the mass of the silica aerogel, and the mass of the surface-modified silica aerogel is 10% of the mass of the polyurethane.

[0025] The preparation method of ultralight tear-resistant outdoor fabric includes the following steps:

[0026] (1) Preparation of the face fabric: By weight percentage, 100% 15D nylon 66 fiber is made into warp yarn, and 84% 15D nylon 66 fiber is combined with 16% 20D polyaramid fiber as weft yarn. The face fabric is obtained by weaving with a fabric weaving machine (the composite method is a common composite yarn preparation process in the field, which will not be described in detail here). The warp yarn weaving density is 90 yarns / cm, the weft yarn weaving density is 85 yarns / cm, and the weaving structure is a grid pattern with a width of 0.15cm.

[0027] (2) Preparation of the base fabric: The base fabric is obtained by weaving 100% 30D polypropylene fiber as warp and weft yarns on a warp fabric weaving machine. (In the preparation of the base fabric disclosed in this embodiment, the warp yarn weaving density is 110 yarns / cm, the weft yarn weaving density is 75 yarns / cm, and the weaving structure is plain weave).

[0028] (3) The sprayed surface modifier and silica aerogel are mixed under vortex conditions and heat-treated. The heat treatment temperature is 80℃ and the heat treatment time is 60min. The spray rate of the surface modifier is 2ml / s to obtain surface-modified silica aerogel. The surface-modified silica aerogel is dispersed in polyurethane solution to obtain spinning solution. The spinning solution is spun onto the upper surface of the base fabric obtained in step (2) to form a nanofiber membrane by electrospinning. The electrospinning pressure is 10kV, the spinning solution injection speed is 0.1mm / min, the collection speed is 50r / min, the temperature is 25℃, and the relative humidity is 40%. (The electrospinning process parameters of the spinning solution are those that can be adjusted by those skilled in the art according to conventional processes. This embodiment provides specific parameters for the preparation of the fabric in this application, but is not limited to these parameters.)

[0029] (4) The bottom fabric with nanofiber membrane on the upper surface obtained in step (3) is laminated with the top fabric obtained in step (1) using a PUR hot melt adhesive laminating machine to obtain the ultralight tear-resistant outdoor fabric.

[0030] Example 2

[0031] This embodiment provides an ultralight tear-resistant outdoor fabric. The structure of the composite fabric includes a base fabric, an outer fabric, and a nanofiber membrane composited between the base fabric and the outer fabric.

[0032] The face fabric is woven from 100% nylon 66 fiber as warp and 89% nylon 66 fiber combined with 11% polyaramid fiber as weft by weight percentage; the base fabric is woven from 100% polypropylene fiber as both warp and weft by weight percentage; the nanofiber membrane is formed by first dispersing surface-modified silica aerogel in a polyurethane solution to obtain a spinning solution, and then electrospinning it onto the upper surface of the base fabric.

[0033] The surface modifier is a 0.5% (w / w) trimethylchlorosilane-ethanol solution, the amount of the surface modifier is 1.5% of the mass of the silica aerogel, and the mass of the surface-modified silica aerogel is 15% of the mass of the polyurethane.

[0034] The preparation method of ultralight tear-resistant outdoor fabric includes the following steps:

[0035] (1) Preparation of the face fabric: 100% 15D nylon 66 fiber is made into warp yarn and 89% 15D nylon 66 fiber is combined with 11% 20D polyaramid fiber as weft yarn. The face fabric is obtained by weaving with a fabric weaving machine. The warp yarn weaving density is 110 yarns / cm and the weft yarn weaving density is 75 yarns / cm. The weaving structure is a grid pattern with a width of 0.15cm.

[0036] (2) Preparation of the base fabric is the same as in Example 1;

[0037] (3) The sprayed surface modifier and silica aerogel were mixed under vortex conditions and heat-treated. The heat treatment temperature was 100℃ and the heat treatment time was 30min. The spray rate of the surface modifier was 0.8ml / s to obtain surface-modified silica aerogel. The surface-modified silica aerogel was dispersed in a polyurethane solution to obtain a spinning solution. The spinning solution was spun onto the upper surface of the base fabric obtained in step (2) by electrospinning to form a nanofiber film. The electrospinning process parameters were the same as in Example 1.

[0038] (4) Same as Example 1.

[0039] Example 3

[0040] This embodiment provides an ultralight tear-resistant outdoor fabric. The structure of the composite fabric includes a base fabric, an outer fabric, and a nanofiber membrane composited between the base fabric and the outer fabric.

[0041] The face fabric is woven from 100% nylon 66 fiber as warp and 87% nylon 66 fiber combined with 13% polyaramid fiber as weft by weight percentage; the base fabric is woven from 100% polypropylene fiber as both warp and weft by weight percentage; the nanofiber membrane is formed by first dispersing surface-modified silica aerogel in a polyurethane solution to obtain a spinning solution, and then electrospinning it onto the upper surface of the base fabric.

[0042] The surface modifier is a 0.3% (w / w) trimethylchlorosilane-ethanol solution, and the amount of the surface modifier is 1.8% of the mass of the silica aerogel. The mass of the surface-modified silica aerogel is 12% of the mass of the polyurethane.

[0043] The preparation method of ultralight tear-resistant outdoor fabric includes the following steps:

[0044] (1) Preparation of the face fabric: By weight percentage, 100% 15D nylon 66 fiber is made into warp yarn, and 87% 15D nylon 66 fiber is combined with 13% 20D polyaramid fiber as weft yarn. The face fabric is obtained by weaving with a fabric weaving machine (the composite method is a common composite yarn preparation process in the field, which will not be described in detail here). The warp yarn weaving density is 90 yarns / cm, the weft yarn weaving density is 85 yarns / cm, and the weaving structure is a grid pattern with a width of 0.15cm.

[0045] (2) Preparation of the base fabric is the same as in Example 1;

[0046] (3) The sprayed surface modifier and silica aerogel were mixed under vortex conditions and heat-treated. The heat treatment temperature was 90℃ and the heat treatment time was 45min. The spray rate of the surface modifier was 1.4ml / s to obtain surface-modified silica aerogel. The surface-modified silica aerogel was dispersed in a polyurethane solution to obtain a spinning solution. The spinning solution was spun onto the upper surface of the base fabric obtained in step (2) by electrospinning to form a nanofiber film. The electrospinning process parameters were the same as in Example 1.

[0047] (4) Same as Example 1.

[0048] Comparative Example 1

[0049] This comparative example provides an ultralight tear-resistant outdoor fabric, the structure of which includes a base fabric, an outer fabric, and a nanofiber membrane composited between the base fabric and the outer fabric.

[0050] The face fabric is woven from 100% nylon 66 fiber as warp and 84% nylon 66 fiber combined with 16% polyaramid fiber as weft by weight percentage; the base fabric is woven from 100% polypropylene fiber as both warp and weft by weight percentage; the nanofiber membrane is formed by first dispersing silica aerogel in a polyurethane solution to obtain a spinning solution, and then electrospinning it onto the surface of the base fabric.

[0051] The preparation method differs from that in Example 1 in step (3): silica aerogel is dispersed in polyurethane solution to obtain spinning solution. The mass of silica aerogel is 10% of the mass of polyurethane. The spinning solution is spun onto the upper surface of the base fabric obtained in step (2) to form a nanofiber membrane by electrospinning. The electrospinning pressure is 10kV, the spinning solution injection speed is 0.1mm / min, the collection speed is 50r / min, the temperature is 25℃, and the relative humidity is 40%.

[0052] Comparative Example 2

[0053] This comparative example provides an ultralight tear-resistant outdoor fabric. The structure of the composite fabric includes a base fabric, an outer fabric laminated on the upper surface of the base fabric, and a nanofiber membrane laminated between the base fabric and the outer fabric.

[0054] The face fabric is woven from 100% nylon 66 fiber as warp and 84% nylon 66 fiber combined with 16% polyaramid fiber as weft by weight percentage; the base fabric is woven from 100% polypropylene fiber as both warp and weft by weight percentage; the nanofiber membrane is formed by first dispersing surface-modified silica aerogel in a polyurethane solution to obtain a spinning solution, and then electrospinning it onto the upper surface of the base fabric.

[0055] The surface modifier is a silane coupling agent-ethanol solution with a mass concentration of 0.1%, and the amount of the surface modifier is 2.0% of the mass of the silica aerogel. The mass of the surface-modified silica aerogel is 10% of the mass of the polyurethane.

[0056] The preparation method is the same as in Example 1.

[0057] Comparative Example 3

[0058] This comparative example provides an ultralight tear-resistant outdoor fabric. The composite fabric structure includes a base fabric, an outer fabric laminated on the upper surface of the base fabric, and a nanofiber membrane laminated on the upper surface of the outer fabric.

[0059] The face fabric, by weight percentage, is woven from 100% nylon 66 fiber as warp and 84% nylon 66 fiber combined with 16% polyaramid fiber as weft; the base fabric, by weight percentage, is woven from 100% polypropylene fiber as both warp and weft; the nanofiber membrane is formed by first dispersing surface-modified silica aerogel in a polyurethane solution to obtain a spinning solution, and then electrospinning it onto the surface of the face fabric.

[0060] The surface modifier is a 0.1% (w / w) trimethylchlorosilane-ethanol solution, the amount of the surface modifier is 2.0% of the mass of the silica aerogel, and the mass of the surface-modified silica aerogel is 10% of the mass of the polyurethane.

[0061] The preparation method of ultralight tear-resistant outdoor fabric includes the following steps:

[0062] (1) Preparation of the face fabric: By weight percentage, 100% 15D nylon 66 fiber is made into warp yarn, and 84% 15D nylon 66 fiber is combined with 16% 20D polyaramid fiber as weft yarn. The face fabric is obtained by weaving with a fabric weaving machine (the composite method is a common composite yarn preparation process in the field, which will not be described in detail here). The warp yarn weaving density is 90 yarns / cm, the weft yarn weaving density is 85 yarns / cm, and the weaving structure is a grid pattern with a width of 0.15cm.

[0063] (2) Preparation of the base fabric: The base fabric is obtained by weaving 100% 30D polypropylene fiber as warp and weft yarns on a warp fabric weaving machine. (In the preparation of the base fabric disclosed in this embodiment, the warp yarn weaving density is 110 yarns / cm, the weft yarn weaving density is 75 yarns / cm, and the weaving structure is plain weave).

[0064] (3) The sprayed surface modifier and silica aerogel are mixed under vortex conditions and heat-treated. The heat treatment temperature is 80℃ and the heat treatment time is 60min. The spray rate of the surface modifier is 2ml / s to obtain surface-modified silica aerogel. The surface-modified silica aerogel is dispersed in polyurethane solution to obtain spinning solution. The spinning solution is spun onto the upper surface of the fabric obtained in step (1) to form a nanofiber membrane by electrospinning. The electrospinning pressure is 10kV, the spinning solution injection speed is 0.1mm / min, the collection speed is 50r / min, the temperature is 25℃, and the relative humidity is 40%. (The electrospinning process parameters of the spinning solution are those that can be adjusted by those skilled in the art according to conventional processes. This embodiment provides specific parameters for the preparation of the fabric in this application, but is not limited to these parameters.)

[0065] (4) The fabric with nanofiber membrane on the upper surface obtained in step (3) is laminated with the base fabric obtained in step (2) using a PUR hot melt adhesive laminating machine to obtain the ultralight tear-resistant outdoor fabric.

[0066] Comparative Example 4

[0067] This comparative example provides an ultralight tear-resistant outdoor fabric, the structure of which includes a base fabric and an outer fabric laminated to the upper surface of the base fabric.

[0068] The face fabric is woven from 100% nylon 66 fiber as warp and 84% nylon 66 fiber combined with 16% polyaramid fiber as weft, by weight percentage; the base fabric is woven from 100% polypropylene fiber as both warp and weft, by weight percentage.

[0069] The base fabric and the outer fabric are laminated using a PUR-type hot melt adhesive laminating machine to obtain the ultralight tear-resistant outdoor fabric.

[0070] The following performance tests were performed on Examples 1-3 and Comparative Examples 1-4:

[0071] A. Tear resistance test: The test shall be conducted in accordance with GB / T3917-1:2009 "Tear resistance of fabrics - Part 1: Determination of tear strength by impact pendulum method".

[0072] B. Weigh the fabric, which measures 1m x 1m, and calculate the weight per unit area.

[0073] C. Air permeability test: Referring to the national standard (GB / T5433), the air permeability of the samples was tested using a YG461G fully automatic fabric air permeability meter. The specific experimental parameters were set as follows: ambient temperature 25℃, relative humidity 60%, pressure difference 100Pa, and air permeability area 20cm². 2The nozzle diameter is 0.8mm. Ten tests were conducted on different parts of the fabric sample, and the average value was taken as the final air permeability data.

[0074] D. Moisture permeability test: According to national standard GB / T12704.1-2009(a), the moisture permeability of the samples was tested using an FX3180 moisture permeability measuring instrument. During the test, the temperature was 38℃, the humidity was 90.0%, the airflow velocity was 0.5 m / s, and the test area was 28.3 cm². 2 Before testing, the test chamber needs to be pre-conditioned for humidity. After automatic humidity conditioning, the instrument begins the moisture permeability test, automatically recording moisture permeability data every hour for a total of two times. After the experiment is completed, the moisture permeability data of the samples are manually recorded, and the average of the five sets of experimental data for each sample is used as the final data.

[0075] E. Hydrostatic Pressure Resistance Test: The fabric was subjected to a hydrostatic pressure resistance test according to GB / T 4744-2013. Test method: The test water on the clamping surface was wiped clean, and the sample was clamped so that the front side of the sample was in contact with the water. A continuously increasing water pressure was applied to the sample at a water pressure increase rate of 60 cm H2O / min, and the water seepage phenomenon was observed. During the pressure increase, the pressure was stopped when the third water droplet appeared on the sample, and the hydrostatic pressure value at this time was recorded.

[0076] F. Waterproof performance test: In a standard laboratory, distilled water is sprayed onto the sample through a funnel, and the sample is rated according to the waterproof standard (European standard ISO 4920).

[0077] The results are shown in Table 1.

[0078] Table 1. Fabric Performance Statistics

[0079]

[0080]

[0081] As shown in Table 1, the fabrics prepared in Examples 1-3 exhibit strong tear strength in both the warp and weft directions, and have low basis weight and light weight. Furthermore, the fabrics possess excellent breathability, moisture permeability, and water resistance, achieving a water resistance rating of 5 and a hydrostatic pressure resistance of approximately 17000 mmH2O, demonstrating excellent overall performance.

[0082] Compared to Example 1, Comparative Example 1 uses unmodified silica aerogel in the nanofiber membrane preparation step, resulting in lower air permeability, moisture permeability, and hydrostatic pressure resistance of the fabric. This is because silica aerogel has a large number of hydroxyl groups on its surface, which easily aggregate, leading to poor dispersibility. This hinders the performance of the nanofiber membrane during preparation. Example 1 uses a surface modifier to treat the silica aerogel, improving its dispersibility and thus enhancing the fabric's air permeability, moisture permeability, and waterproof performance.

[0083] Compared to Comparative Example 1, Comparative Example 2 uses a conventional silane coupling agent instead of trimethylchlorosilane. According to the data comparison, trimethylchlorosilane performs better in the surface modification treatment of silica aerogel than the conventional silane coupling agent. Therefore, the overall performance of the fabric in Comparative Example 2 is better than that in Comparative Example 1.

[0084] Compared to Example 1, Comparative Example 3 has a nanofiber membrane placed on the upper surface of the fabric. Based on the data comparison, the tear resistance of Comparative Example 3 is significantly lower than that of Example 1. The air permeability, moisture permeability and hydrostatic pressure resistance of the fabric in Comparative Example 3 are lower than those in Example 1. Compared to Example 1, Comparative Example 4 does not have a nanofiber membrane, and the tear resistance of the fabric is significantly lower than that of Example 1.

[0085] To further verify the influence of the composition of the fabric on the fabric performance, based on Example 1, the composition of the fabric was adjusted according to Table 2, and then the fabric was prepared according to the preparation method disclosed in Example 1.

[0086] Table 2. Composition Design of the Fabric

[0087]

[0088]

[0089] Mechanical properties were tested on fabric samples 1-5. Tear strength was tested according to GB / T3917-1:2009 "Tear Properties of Fabrics - Part 1: Determination of Tear Strength by Impact Pendulum Method". Tensile strength was tested according to standard ASTM D5034-2017. The results are shown in Table 3.

[0090] Table 3. Results Statistics Table

[0091]

[0092] As can be seen from the results in Table 3, the fabric obtained by warp knitting using nylon 66 fiber as the warp and nylon 66 fiber composite polyaramid fiber as the weft exhibits both strong tear strength and tensile strength in both the warp and weft directions, resulting in high tear resistance. In addition, the table shows that when 13% polyester fiber is used instead of 13% polyaramid fiber, the tear strength and tensile strength of fabric 4 are significantly lower than those of fabrics 1-3. This indicates that polyaramid fiber has a significant advantage over commonly used polyester fiber in improving the tear resistance of fabrics. Furthermore, the tear resistance of fabric 5, which uses 100% nylon 66 fiber as both warp and weft, is also far inferior to that of fabrics 1-3.

[0093] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An ultralight, tear-resistant outdoor fabric, characterized in that: The structure of the fabric includes a base fabric, a face fabric, and a nanofiber membrane composited between the base fabric and the face fabric. The face fabric, by weight percentage, is woven from 100% nylon 66 fiber as warp and 84-89% nylon 66 fiber combined with 11-16% polyaramid fiber as weft; the base fabric, by weight percentage, is woven from 100% polypropylene fiber as both warp and weft; the nanofiber membrane is formed by first dispersing silica aerogel modified with a surface modifier in a polyurethane solution to obtain a spinning solution, and then electrospinning the spinning solution onto the surface of the base fabric; the surface modifier is a trimethylchlorosilane-ethanol solution with a mass concentration of 0.1-0.5%, and the amount of the surface modifier is 1.5-2.0% of the mass of the silica aerogel.

2. The ultralight tear-resistant outdoor fabric according to claim 1, characterized in that: The warp yarn density is 90-110 yarns / cm, the weft yarn density is 75-85 yarns / cm, and the weave structure is a checkered pattern with a width of 0.15cm.

3. The ultralight tear-resistant outdoor fabric according to claim 1, characterized in that: The mass of the surface-modified silica aerogel is 10-15% of the mass of the polyurethane.

4. A method for preparing an ultralight tear-resistant outdoor fabric as described in any one of claims 1-3, characterized in that: Includes the following steps: (1) Preparation of the face fabric: The face fabric is obtained by weaving with nylon 66 fiber as warp yarn and nylon 66 fiber composite polyaramid fiber as weft yarn using a fabric weaving machine; (2) Preparation of the base fabric: The base fabric is obtained by weaving polypropylene fiber as warp and weft yarns using a fabric weaving machine; (3) After heat treatment of silica aerogel and surface modifier, surface modified silica aerogel is obtained. Silica aerogel is dispersed in polyurethane solution to obtain spinning solution. The spinning solution is spun onto the upper surface of the base fabric obtained in step (2) by electrospinning to form a nanofiber membrane. (4) The bottom fabric with nanofiber membrane on the upper surface obtained in step (3) is laminated with the top fabric obtained in step (1) by using a hot melt adhesive laminating machine to obtain the ultralight tear-resistant outdoor fabric.

5. The method for preparing an ultralight tear-resistant outdoor fabric according to claim 4, characterized in that: Step (3) specifically involves mixing the sprayed surface modifier with silica aerogel under vortexing conditions, with a heat treatment temperature of 80-100℃ and a heat treatment time of 30-60 min, and the spray rate of the surface modifier being 0.8-2 ml / s.

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