A light and thin thermal knitted fabric and a preparation method thereof

Abstract

The present application provides a kind of light and thin thermal knitted fabric, the light and thin thermal knitted fabric includes knitted layer, thermal layer and breathable layer, the breathable layer is used to bond composite knitted layer and thermal layer, the knitted layer is pad organization, the pad organization is constituted by ground yarn and two pad yarns, the thermal layer is loaded double-layer hollow particle electrostatic spinning film, and the breathable layer is resin finishing agent layer.The knitted fabric of the present application is formed by special processing, and the fabric has the characteristics of light and thin, fluffy, moisture absorption and thermal insulation.

Description

Technical Field

[0001] This invention relates to the field of knitted fabrics, specifically to a lightweight, heat-insulating knitted fabric and its preparation method. Background Technology

[0002] As people's demands for clothing and aesthetics increase, the requirements for intimate apparel go beyond basic coverage and protection; they also demand greater comfort, fashionable appearance, and functionality. Therefore, in the entire garment design and production process, the style and structure of the fabric are crucial to the design, playing a decisive role in the overall shape and performance of the garment.

[0003] The application of high-tech, novel, warm, and healthy textile materials is constantly emerging, such as graphene fabrics, German fleece fabrics, camellia oil napped fabrics, and coffee charcoal fabrics, all of which are widely used in the field of thermal fabrics. Currently, most thermal fabrics on the market are three-layered, making them bulky and inconvenient to wear. To address this, our company has developed a lightweight fabric that possesses warmth and moisture-wicking properties. Furthermore, the fabric is thin, lightweight, and comfortable to wear, allowing people to say goodbye to bulky winter attire. It achieves a perfect combination of technology and fashion, function and aesthetics. Summary of the Invention

[0004] The technical problem to be solved: The purpose of this invention is to provide a lightweight and heat-insulating knitted fabric and its preparation method. Through special processing, the fabric has the characteristics of being lightweight, fluffy, moisture-absorbing and heat-insulating.

[0005] Technical solution: A lightweight and thermally insulating knitted fabric, comprising a knitted layer, a thermal insulation layer, and a breathable layer, wherein the breathable layer is used to bond the composite knitted layer and the thermal insulation layer, the knitted layer is a padding structure consisting of a ground yarn and two padding yarns, the thermal insulation layer is a loaded double-layer hollow particle electrospun film, and the breathable layer is a resin finishing agent layer.

[0006] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0007] S1. Preparation of the knitted layer: Wool is used as the ground yarn, wool-polyester blended yarn is used as the first interlining yarn, and wool-polyester-nylon blended yarn is used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 1:1 or 2:2, and the interlining ratio of the second interlining yarn to the ground yarn is 1:3-5, thus obtaining the knitted layer.

[0008] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0009] S3. Preparation of electrospun film: Add double-layer hollow particles to EVA spinning solution and prepare electrospun film loaded with double-layer hollow particles by electrospinning. Spray moisture-absorbing and perspiration-wicking resin on one side of the obtained electrospun film.

[0010] S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the side of the electrospinning film coated with resin with the side of the knitted layer that has been napped by hot pressing to obtain a lightweight and heat-insulating knitted fabric.

[0011] Preferably, the first lining yarn is a blend of polyester filament and wool, and the second lining yarn is a blend of polyester filament and 70 / 30 wool / acrylic yarn.

[0012] Preferably, the method for preparing the double-layer hollow particles in step S3 includes the following steps:

[0013] S11. Preparation of hollow TiO2: Using washed pollen as a template, it was dispersed in a mixed solution of anhydrous ethanol and acetonitrile. Then, 30wt% ammonia water was added and stirred evenly. A mixed solution of tetrabutyl titanate, triethanolamine and anhydrous ethanol in a mass ratio of 15:1:250 was added dropwise to the pollen solution. The mixture was stirred continuously for 2-4 hours. After the reaction was complete, the precipitate was separated, washed and calcined to obtain hollow TiO2 microspheres.

[0014] S12. Preparation of silk fibroin aqueous solution: Degummed silk is dissolved in a ternary solution of calcium chloride / ethanol / water and then dialyzed to obtain silk fibroin aqueous solution. The silk fibroin aqueous solution is concentrated to a concentration of 10-15 wt%.

[0015] S13. Preparation of aerogel-coated hollow TiO2: After drying the TiO2 hollow microspheres prepared in step S1, they are coated with high-concentration chitosan. After drying, a silk fibroin aqueous solution is sprayed onto the surface of the TiO2 hollow microspheres. Then, the microspheres are freeze-dried. The microspheres are taken out and the spraying of silk fibroin aqueous solution and freeze-drying are repeated several times to obtain aerogel-coated hollow TiO2.

[0016] S14. Graphene oxide and aerogel-coated hollow TiO2 are dispersed separately in deionized water, the pH is adjusted to 3 with acid, and the mixture is ultrasonically dispersed to obtain a suspension. The two suspensions are mixed and added to a high-pressure reactor, and hydrazine hydrate is added to react, thus obtaining the graphene-coated TiO2 hollow sphere composite material.

[0017] Preferably, in step S3, the concentration of the EVA spinning solution is 4.5-6.2 wt%, the content of double-layer hollow particles in the spinning solution is 3.5-6 wt%, the application rate of the moisture-wicking resin is 12-17 mg / m2, and the moisture-wicking resin is used as a finishing agent. FINISHHPX.

[0018] Preferably, in step S4, the hot pressing pressure is 3-8N, the temperature is 120-160℃, and the time is 12-18s.

[0019] Preferably, in step S11, the mass ratio of tetrabutyl titanate to pollen is 1:6-10; the calcination temperature is 650℃, the calcination holding time is 2-3h, and the calcination heating rate is 5-10℃ / min.

[0020] Preferably, in step S13, the ratio of the thickness of the aerogel layer to the diameter of the TiO2 hollow microspheres is 1:1-2.

[0021] Preferably, in step S14, the mass ratio of graphene oxide, aerogel-coated hollow TiO2, and hydrazine hydrate is 1:5-10:0.1-0.2, the reaction temperature is 100-130℃, and the reaction time is 2-4h.

[0022] Beneficial effects: The lightweight and thermally insulating knitted fabric of this invention has the following advantages:

[0023] 1. The thermal insulation knitted fabric of the present invention is composed of a knitted layer, a thermal insulation layer and a breathable layer. The knitted layer is made of a padding fabric, which is formed by combining the padding fabric with an electrostatic spinning film. At the same time, a breathable layer is added between the thermal insulation layer and the breathable layer, so that the fabric has the function of moisture absorption and warmth retention.

[0024] 2. In this invention, a padding structure is used to weave the fabric, with the padding yarn exposed on the reverse side of the fabric. The reverse side is then napped. Since the first and second padding yarns are wool blend yarns, and wool is a short fiber, the short fibers will be napped during the napping process, increasing the air layer between the knitted layer and the electrospun film layer, thus improving the heat preservation effect.

[0025] 3. In this invention, the first lining yarn is a wool-polyester blended yarn, and the second lining yarn is a wool-polyester-nylon blended yarn. When the short-fiber wool is napped, it will be fuzzy. Polyester and nylon play the role of ensuring mechanical function. However, the hydrophilicity of polyester, nylon and EVA is not strong. After being combined with wool knitted fabric, the moisture permeability decreases. Therefore, before hot pressing, moisture-absorbing and perspiration-wicking resin is sprayed on the electrostatic spinning film. The fabric can keep warm while also having a moisture-permeable effect.

[0026] 4. In this invention, a double-layer hollow particle is added to the electrospun film layer. First, hollow titanium dioxide particles are prepared, and then a gel layer is formed on the surface of the titanium dioxide particles. After freeze-drying, the gel layer has a porous structure. Finally, a layer of graphene is coated on the outside of the gel layer. Since the gel layer is made of protein, its surface contains abundant amino groups. In addition to amino groups, the surface also contains a large number of negatively charged groups such as hydroxyl and carboxyl groups. Graphene oxide achieves coating of the gel layer through electrostatic attraction. The double-layer design and the composite effect of titanium dioxide and graphene enhance the heat preservation effect of the knitted fabric. Detailed Implementation

[0027] The present invention will be further described below with reference to embodiments. These embodiments are illustrative of the present invention, but the present invention is not limited to these embodiments:

[0028] Example 1

[0029] The preparation method of double-layer hollow particles includes the following steps:

[0030] S11. Preparation of hollow TiO2: Using washed pollen as a template, it was dispersed in a mixed solution of anhydrous ethanol and acetonitrile. Then, 30wt% ammonia water was added, with a pollen to ammonia water mass-volume ratio of 1g:1mL. After stirring evenly, a mixed solution of tetrabutyl titanate, triethanolamine and anhydrous ethanol in a mass ratio of 15:1:250 was added dropwise to the pollen solution, with a tetrabutyl titanate to pollen mass ratio of 1:6. The mixture was stirred continuously for 4h. After the reaction was complete, the precipitate was separated, washed and calcined at a temperature of 650℃ for 2h at a heating rate of 5℃ / min to obtain hollow TiO2 microspheres.

[0031] S12. Preparation of silk fibroin aqueous solution: Degummed silk is dissolved in a ternary solution of calcium chloride / ethanol / water and then dialyzed to obtain a silk fibroin aqueous solution. The silk fibroin aqueous solution is concentrated to a concentration of 10 wt%.

[0032] S13. Preparation of aerogel-coated hollow TiO2: After drying the TiO2 hollow microspheres prepared in step S1, they were coated with high-concentration chitosan. After drying, a silk fibroin aqueous solution was sprayed onto the surface of the TiO2 hollow microspheres. Then, the microspheres were freeze-dried. The microspheres were taken out and the spraying of silk fibroin aqueous solution and freeze-drying were repeated several times to obtain aerogel-coated hollow TiO2. The ratio of the thickness of the aerogel layer to the diameter of the TiO2 hollow microspheres was 1:1.2.

[0033] S14. Graphene oxide and aerogel-coated hollow TiO2 were separately dispersed in deionized water, the pH was adjusted to 3 with acid, and the mixture was ultrasonically dispersed to obtain a suspension. The two suspensions were mixed and added to a high-pressure reactor. Hydrazine hydrate was added to carry out the reaction. The mass ratio of graphene oxide, aerogel-coated hollow TiO2 and hydrazine hydrate was 1:5:0.1. The reaction temperature was 130℃ and the reaction time was 2h to obtain the graphene-coated TiO2 hollow sphere composite material.

[0034] Example 2

[0035] The preparation method of double-layer hollow particles includes the following steps:

[0036] S11. Preparation of hollow TiO2: Using washed pollen as a template, it was dispersed in a mixed solution of anhydrous ethanol and acetonitrile. Then, 30wt% ammonia water was added, with a pollen to ammonia water mass-volume ratio of 1g:1mL. After stirring evenly, a mixed solution of tetrabutyl titanate, triethanolamine and anhydrous ethanol in a mass ratio of 15:1:250 was added dropwise to the pollen solution, with a tetrabutyl titanate to pollen mass ratio of 1:10. The mixture was stirred continuously for 2h. After the reaction was complete, the precipitate was separated, washed and calcined at a temperature of 650℃ for 3h at a heating rate of 10℃ / min to obtain hollow TiO2 microspheres.

[0037] S12. Preparation of silk fibroin aqueous solution: Degummed silk is dissolved in a ternary solution of calcium chloride / ethanol / water and then dialyzed to obtain a silk fibroin aqueous solution. The silk fibroin aqueous solution is concentrated to a concentration of 15 wt%.

[0038] S13. Preparation of aerogel-coated hollow TiO2: After drying the TiO2 hollow microspheres prepared in step S1, they were coated with high-concentration chitosan. After drying, a silk fibroin aqueous solution was sprayed onto the surface of the TiO2 hollow microspheres. Then, the microspheres were freeze-dried. The microspheres were taken out and the spraying of silk fibroin aqueous solution and freeze-drying were repeated several times to obtain aerogel-coated hollow TiO2. The ratio of the thickness of the aerogel layer to the diameter of the TiO2 hollow microspheres was 1:1.5.

[0039] S14. Graphene oxide and aerogel-coated hollow TiO2 were separately dispersed in deionized water, the pH was adjusted to 3 with acid, and the mixture was ultrasonically dispersed to obtain a suspension. The two suspensions were mixed and added to a high-pressure reactor, and hydrazine hydrate was added to carry out the reaction. The mass ratio of graphene oxide, aerogel-coated hollow TiO2 and hydrazine hydrate was 1:10:0.2. The reaction temperature was 100℃ and the reaction time was 4h to obtain the graphene-coated TiO2 hollow sphere composite material.

[0040] Example 3

[0041] The preparation method of double-layer hollow particles includes the following steps:

[0042] S11. Preparation of hollow TiO2: Using washed pollen as a template, it was dispersed in a mixed solution of anhydrous ethanol and acetonitrile. Then, 30wt% ammonia water was added, with a pollen to ammonia water mass-volume ratio of 1g:1mL. After stirring evenly, a mixed solution of tetrabutyl titanate, triethanolamine and anhydrous ethanol in a mass ratio of 15:1:250 was added dropwise to the pollen solution, with a tetrabutyl titanate to pollen mass ratio of 1:7. The mixture was stirred continuously for 4h. After the reaction was complete, the precipitate was separated, washed and calcined at a temperature of 650℃ for 2h at a heating rate of 6℃ / min to obtain hollow TiO2 microspheres.

[0043] S12. Preparation of silk fibroin aqueous solution: Degummed silk was dissolved in a ternary solution of calcium chloride / ethanol / water and then dialyzed to obtain a silk fibroin aqueous solution. The silk fibroin aqueous solution was concentrated to a concentration of 14 wt%.

[0044] S13. Preparation of aerogel-coated hollow TiO2: After drying the TiO2 hollow microspheres prepared in step S1, they were coated with high-concentration chitosan. After drying, a silk fibroin aqueous solution was sprayed onto the surface of the TiO2 hollow microspheres. Then, the microspheres were freeze-dried. The microspheres were taken out and the spraying of silk fibroin aqueous solution and freeze-drying were repeated several times to obtain aerogel-coated hollow TiO2. The ratio of the thickness of the aerogel layer to the diameter of the TiO2 hollow microspheres was 1:1.4.

[0045] S14. Graphene oxide and aerogel-coated hollow TiO2 were separately dispersed in deionized water, the pH was adjusted to 3 with acid, and the mixture was ultrasonically dispersed to obtain a suspension. The two suspensions were mixed and added to a high-pressure reactor. Hydrazine hydrate was added to carry out the reaction. The mass ratio of graphene oxide, aerogel-coated hollow TiO2 and hydrazine hydrate was 1:6:0.1. The reaction temperature was 110℃ and the reaction time was 3.5h to obtain the graphene-coated TiO2 hollow sphere composite material.

[0046] Example 4

[0047] The preparation method of double-layer hollow particles includes the following steps:

[0048] S11. Preparation of hollow TiO2: Using washed pollen as a template, it was dispersed in a mixed solution of anhydrous ethanol and acetonitrile. Then, 30wt% ammonia water was added, with a pollen to ammonia water mass-volume ratio of 1g:1mL. After stirring evenly, a mixed solution of tetrabutyl titanate, triethanolamine and anhydrous ethanol in a mass ratio of 15:1:250 was added dropwise to the pollen solution, with a tetrabutyl titanate to pollen mass ratio of 1:9. The mixture was stirred continuously for 3h. After the reaction was complete, the precipitate was separated, washed and calcined at a temperature of 650℃ for 3h at a heating rate of 9℃ / min to obtain hollow TiO2 microspheres.

[0049] S12. Preparation of silk fibroin aqueous solution: Degummed silk is dissolved in a ternary solution of calcium chloride / ethanol / water and then dialyzed to obtain a silk fibroin aqueous solution. The silk fibroin aqueous solution is concentrated to a concentration of 12wt%.

[0050] S13. Preparation of aerogel-coated hollow TiO2: After drying the TiO2 hollow microspheres prepared in step S1, they were coated with high-concentration chitosan. After drying, a silk fibroin aqueous solution was sprayed onto the surface of the TiO2 hollow microspheres. Then, the microspheres were freeze-dried. The microspheres were taken out and the spraying of silk fibroin aqueous solution and freeze-drying were repeated several times to obtain aerogel-coated hollow TiO2. The ratio of the thickness of the aerogel layer to the diameter of the TiO2 hollow microspheres was 1:1.5.

[0051] S14. Graphene oxide and aerogel-coated hollow TiO2 were separately dispersed in deionized water, the pH was adjusted to 3 with acid, and the mixture was ultrasonically dispersed to obtain a suspension. The two suspensions were mixed and added to a high-pressure reactor. Hydrazine hydrate was added to carry out the reaction. The mass ratio of graphene oxide, aerogel-coated hollow TiO2 and hydrazine hydrate was 1:9:0.2. The reaction temperature was 130℃ and the reaction time was 2.5h to obtain the graphene-coated TiO2 hollow sphere composite material.

[0052] Example 1 55.6um Example 2 60.2um Example 3 61.1um Example 4 59.8um

[0053] Example 5

[0054] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0055] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0056] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 1:1, and the interlining ratio of the second interlining yarn to the ground yarn is 1:3, thus obtaining the knitted layer;

[0057] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0058] S3. Preparation of electrospun film: The double-layer hollow particles prepared in Example 1 were added to an EVA spinning solution with a concentration of 4.5 wt%, and the content of the double-layer hollow particles in the spinning solution was 3.5 wt%. An electrospun film loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun film was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 12 mg / m³ 2 ;

[0059] S4. Composite: Apply tension to the knitted layer prepared in step S1, and combine the side of the electrospinning film coated with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 8N, the temperature is 120℃, and the time is 18s to obtain a lightweight and heat-insulating knitted fabric.

[0060] Example 6

[0061] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0062] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0063] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 2:2, and the interlining ratio of the second interlining yarn to the ground yarn is 1:5 to obtain the knitted layer.

[0064] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0065] S3. Preparation of electrospun film: The double-layer hollow particles prepared in Example 2 were added to an EVA spinning solution with a concentration of 6.2 wt%, and the content of the double-layer hollow particles in the spinning solution was 6 wt%. An electrospun film loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun film was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 17 mg / m³ 2 ;

[0066] S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the side of the electrospinning film coated with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 3N, the temperature is 160℃, and the time is 12s to obtain a lightweight and heat-insulating knitted fabric.

[0067] Example 7

[0068] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0069] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0070] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 1:1, and the interlining ratio of the second interlining yarn to the ground yarn is 1:3, thus obtaining the knitted layer;

[0071] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0072] S3. Preparation of electrospun film: The double-layer hollow particles prepared in Example 3 were added to an EVA spinning solution with a concentration of 4.5 wt%, and the content of the double-layer hollow particles in the spinning solution was 4.2 wt%. An electrospun film loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun film was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 13 mg / m³ 2 ;

[0073] S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the side of the electrospun film coated with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 5N, the temperature is 130℃, and the time is 13s to obtain a lightweight and heat-insulating knitted fabric.

[0074] Example 8

[0075] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0076] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0077] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 2:2, and the interlining ratio of the second interlining yarn to the ground yarn is 1:4 to obtain the knitted layer.

[0078] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0079] S3. Preparation of electrospun film: The double-layer hollow particles prepared in Example 4 were added to an EVA spinning solution with a concentration of 5.5 wt%, and the content of the double-layer hollow particles in the spinning solution was 5.5 wt%. An electrospun film loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun film was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 16 mg / m³ 2 ;

[0080] S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the side of the electrospinning film coated with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 7N, the temperature is 140℃, and the time is 17s to obtain a lightweight and heat-insulating knitted fabric.

[0081] Example 9

[0082] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0083] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0084] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 2:2, and the interlining ratio of the second interlining yarn to the ground yarn is 1:4 to obtain the knitted layer.

[0085] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0086] S3. Preparation of electrospun film: The double-layer hollow particles prepared in Example 4 were added to an EVA spinning solution with a concentration of 5 wt%, and the content of the double-layer hollow particles in the spinning solution was 4.8 wt%. An electrospun film loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun film was sprayed with... FINISHHPX moisture-wicking resin, application rate: 15 mg / m³ 2 ;

[0087] S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the side of the electrospun film coated with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 6N, the temperature is 130℃, and the time is 15s to obtain a lightweight and heat-insulating knitted fabric.

[0088] Comparative Example 1

[0089] A lightweight, heat-insulating knitted fabric includes a knitted layer and an insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The insulating layer is a double-layered hollow particle electrospun film. The preparation method of the above-mentioned lightweight, heat-insulating knitted fabric includes the following steps:

[0090] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 1:1, and the interlining ratio of the second interlining yarn to the ground yarn is 1:3, thus obtaining the knitted layer;

[0091] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0092] S3. Preparation of electrospun film: The double-layer hollow particles prepared in Example 3 were added to an EVA spinning solution with a concentration of 4.5 wt%, and the content of the double-layer hollow particles in the spinning solution was 4.2 wt%. An electrospun film loaded with double-layer hollow particles was prepared by electrospinning.

[0093] S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the electrospun film with the napped side of the knitted layer by hot pressing. The hot pressing pressure is 5N, the temperature is 130℃, and the time is 13s to obtain a lightweight and heat-insulating knitted fabric.

[0094] Comparative Example 2

[0095] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0096] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0097] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 2:2, and the interlining ratio of the second interlining yarn to the ground yarn is 1:4 to obtain the knitted layer.

[0098] S2. Preparation of electrospun film: The double-layer hollow particles prepared in Example 4 were added to an EVA spinning solution with a concentration of 5.5 wt%, and the content of the double-layer hollow particles in the spinning solution was 5.5 wt%. An electrospun film loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun film was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 16 mg / m³2 ;

[0099] S3. Composite: Apply tension to the knitted layer prepared in step S1, and combine the side of the electrospun film coated with resin with the side of the knitted layer with the exposed padding yarn by hot pressing. The hot pressing pressure is 7N, the temperature is 140℃, and the time is 17s to obtain a lightweight and heat-insulating knitted fabric.

[0100] Comparative Example 3

[0101] A lightweight, heat-insulating knitted fabric includes a knitted layer, an insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The insulating layer is an electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0102] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0103] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 2:2, and the interlining ratio of the second interlining yarn to the ground yarn is 1:5 to obtain the knitted layer.

[0104] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0105] S3. Preparation of electrospun film: An electrospun film was prepared by electrospinning in a 6.2 wt% EVA spinning solution. One side of the obtained electrospun film was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 17 mg / m³ 2 ;

[0106] S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the side of the electrospinning film coated with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 3N, the temperature is 160℃, and the time is 12s to obtain a lightweight and heat-insulating knitted fabric.

[0107] Comparative Example 4

[0108] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0109] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0110] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 1:1, and the interlining ratio of the second interlining yarn to the ground yarn is 1:3, thus obtaining the knitted layer;

[0111] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0112] S3. Preparation of electrospun membrane: TiO2 hollow microspheres were added to an EVA spinning solution with a concentration of 4.5 wt%, and the content of double-layer hollow particles in the spinning solution was 4.2 wt%. An electrospun membrane loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun membrane was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 13 mg / m³ 2 ;

[0113] S4. Composite: Apply tension to the knitted layer prepared in step S1, and combine the side of the electrospinning film sprayed with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 5N, the temperature is 130℃, and the time is 13s to obtain a lightweight and heat-insulating knitted fabric.

[0114] The preparation method of TiO2 hollow microspheres is as follows: using washed pollen as a template, it is dispersed in a mixed solution of anhydrous ethanol and acetonitrile, and then 30wt% ammonia water is added. The mass-volume ratio of pollen to ammonia water is 1g:1mL. After stirring evenly, a mixed solution of tetrabutyl titanate, triethanolamine and anhydrous ethanol with a mass ratio of 15:1:250 is added dropwise to the pollen solution. The mass ratio of tetrabutyl titanate to pollen is 1:9. The mixture is stirred continuously for 3h. After the reaction is complete, the precipitate is separated, washed and calcined at a temperature of 650℃ for 3h at a heating rate of 9℃ / min to obtain TiO2 hollow microspheres.

[0115] Comparative Example 5

[0116] A lightweight, heat-insulating knitted fabric includes a knitted layer, a heat-insulating layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the heat-insulating layer. The knitted layer is a padding structure composed of a ground yarn and two padding yarns. The heat-insulating layer is a double-layered hollow particle electrospun film. The breathable layer is... FINISHHPX resin finishing layer;

[0117] The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps:

[0118] S1. Preparation of the knitted layer: 60s wool is used as the ground yarn, 4tex polyester filament and 20tex wool-polyester blended yarn are used as the first interlining yarn, and 4tex polyester filament and 20tex 70 / 30 wool / acrylic blended yarn are used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 1:1, and the interlining ratio of the second interlining yarn to the ground yarn is 1:3, thus obtaining the knitted layer;

[0119] S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer;

[0120] S3. Preparation of electrospun membrane: TiO2 / graphene composite hollow microspheres were added to an EVA spinning solution with a concentration of 4.5 wt%, and the content of double-layer hollow particles in the spinning solution was 4.2 wt%. An electrospun membrane loaded with double-layer hollow particles was prepared by electrospinning. One side of the obtained electrospun membrane was sprayed with... FINISHHPX moisture-wicking resin, with an application rate of 13 mg / m³ 2 ;

[0121] S4. Composite: Apply tension to the knitted layer prepared in step S1, and combine the side of the electrospinning film sprayed with resin with the side of the knitted layer that has been napped by hot pressing. The hot pressing pressure is 5N, the temperature is 130℃, and the time is 13s to obtain a lightweight and heat-insulating knitted fabric.

[0122] The preparation method of TiO2 hollow microspheres is as follows: Washed pollen is used as a template and dispersed in a mixed solution of anhydrous ethanol and acetonitrile. Then, 30wt% ammonia water is added, with a pollen to ammonia water mass-volume ratio of 1g:1mL. After stirring evenly, a mixed solution of tetrabutyl titanate, triethanolamine, and anhydrous ethanol in a mass ratio of 15:1:250 is added dropwise to the pollen solution, with a tetrabutyl titanate to pollen mass ratio of 1:9. The mixture is stirred continuously for 3 hours. After the reaction is complete, the precipitate is separated, washed, and calcined at 650℃ for 3 hours at a heating rate of 9℃ / min to obtain TiO2 hollow microspheres. The TiO2 hollow microspheres are then dispersed in anhydrous ethanol, sonicated, and 3-aminopropyltrihydroxysilane is added. The mixture is stirred to obtain TiO2 hollow microspheres with amino groups on the surface.

[0123] Graphene oxide and amino-containing TiO2 hollow microspheres were separately dispersed in deionized water, and the pH was adjusted to 3 with acid. The microspheres were then ultrasonically dispersed to obtain a suspension. The two suspensions were mixed and added to a high-pressure reactor. Hydrazine hydrate was added to carry out the reaction. The mass ratio of graphene oxide, amino-containing TiO2 hollow microspheres and hydrazine hydrate was 1:10:0.3. The reaction temperature was 125℃ and the reaction time was 3h to obtain TiO2 / graphene composite hollow microspheres.

[0124] Performance testing:

[0125] The thermal insulation performance of the fabric was tested in accordance with GB / T 11048-2018 "Determination of thermal and moisture resistance of textiles under steady-state conditions for physiological comfort (evaporative hot plate method)", using a flat-plate fabric thermal insulation tester to test the thermal insulation rate, heat transfer coefficient and clo value of the fabric.

[0126] The moisture permeability of the fabric was tested in accordance with GB / T 12704.1-2009 "Textiles - Test Methods for Moisture Permeability of Fabrics - Part 1: Moisture Absorption Method", using a fabric moisture permeability meter.

[0127] Example 5 75.2 2.13 5.21 8127 Example 6 74.6 2.09 5.18 8023 Example 7 74.5 2.12 4.99 7965 Example 8 76.1 1.98 5.06 8231 Example 9 77.4 2.03 5.23 7825 Comparative Example 1 74.9 2.08 5.16 6689 Comparative Example 2 68.1 2.48 4.78 7956 Comparative Example 3 62.3 3.11 4.56 8109 Comparative Example 4 65.1 2.88 4.69 8156 Comparative Example 5 66.9 2.45 4.85 7998

[0128] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A lightweight, heat-insulating knitted fabric, characterized in that: The lightweight thermal knitted fabric includes a knitted layer, a thermal insulation layer, and a breathable layer. The breathable layer is used to bond the composite knitted layer and the thermal insulation layer. The knitted layer is a padding structure, which consists of a ground yarn and two padding yarns. The thermal insulation layer is a loaded double-layer hollow particle electrospun film. The breathable layer is a resin finishing agent layer. The above-mentioned method for preparing lightweight and thermally insulating knitted fabric includes the following steps: S1. Preparation of the knitted layer: Wool is used as the ground yarn, wool-polyester blended yarn is used as the first interlining yarn, and wool / polyester / acrylic blended yarn is used as the second interlining yarn. The interlining ratio of the first interlining yarn to the ground yarn is 1:1 or 2:2, and the interlining ratio of the second interlining yarn to the ground yarn is 1:3-5, to obtain the knitted layer. S2. Fluffing treatment of the knitted layer: Fluffing treatment is performed on one side of the padding yarn of the knitted layer to obtain a fluffed knitted layer; S3. Preparation of electrospun film: Add double-layer hollow particles to EVA spinning solution and prepare electrospun film loaded with double-layer hollow particles by electrospinning. Spray moisture-absorbing and perspiration-wicking resin on one side of the obtained electrospun film. S4. Composite: Apply tension to the knitted layer prepared in step S1, and composite the side of the electrospinning film sprayed with resin with the side of the knitted layer that has been napped by hot pressing to obtain a lightweight and heat-insulating knitted fabric. The preparation method of the double-layer hollow particles in step S3 includes the following steps: S11. Preparation of hollow TiO2: Using washed pollen as a template, it was dispersed in a mixed solution of anhydrous ethanol and acetonitrile. Then, 30wt% ammonia water was added and stirred evenly. A mixed solution of tetrabutyl titanate, triethanolamine and anhydrous ethanol in a mass ratio of 15:1:250 was added dropwise to the pollen solution. The mixture was stirred continuously for 2-4 hours. After the reaction was complete, the precipitate was separated, washed and calcined to obtain hollow TiO2 microspheres. S12. Preparation of silk fibroin aqueous solution: Degummed silk is dissolved in a ternary solution of calcium chloride / ethanol / water and then dialyzed to obtain a silk fibroin aqueous solution. The silk fibroin aqueous solution is concentrated to a concentration of 10-15 wt%. S13. Preparation of aerogel-coated hollow TiO2: After drying the TiO2 hollow microspheres prepared in step S11, they are coated with chitosan. After drying, a silk fibroin aqueous solution is sprayed onto the surface of the TiO2 hollow microspheres. Then, the microspheres are freeze-dried. The microspheres are taken out and the spraying of silk fibroin aqueous solution and freeze-drying are repeated several times to obtain aerogel-coated hollow TiO2. S14. Graphene oxide and aerogel-coated hollow TiO2 are dispersed separately in deionized water, the pH is adjusted to 3 with acid, and the mixture is ultrasonically dispersed to obtain a suspension. The two suspensions are mixed and added to a high-pressure reactor, and hydrazine hydrate is added to react, thus obtaining the graphene-coated TiO2 hollow sphere composite material.

2. The lightweight, heat-insulating knitted fabric according to claim 1, characterized in that: In step S3, the concentration of the EVA spinning solution is 4.5-6.2 wt%, the content of double-layer hollow particles in the spinning solution is 3.5-6 wt%, and the sizing amount of moisture-wicking resin is 12-17 mg / m³. 2 .

3. The lightweight, heat-insulating knitted fabric according to claim 1, characterized in that: The temperature for compounding in step S4 is 120-160℃, and the time is 12-18s.

4. The lightweight, heat-insulating knitted fabric according to claim 1, characterized in that: In step S11, the mass ratio of tetrabutyl titanate to pollen is 1:6-10; the calcination temperature is 650℃, the calcination holding time is 2-3h, and the calcination heating rate is 5-10℃ / min.

5. The lightweight, heat-insulating knitted fabric according to claim 1, characterized in that: In step S13, the ratio of the thickness of the aerogel layer to the diameter of the TiO2 hollow microspheres is 1:1-2.

6. The lightweight, heat-insulating knitted fabric according to claim 1, characterized in that: In step S14, the mass ratio of graphene oxide, aerogel-coated hollow TiO2, and hydrazine hydrate is 1:5-10:0.1-0.2, the reaction temperature is 100-130℃, and the reaction time is 2-4h.