A kind of moisture-absorbing and moisture-conducting bio-based polyester fabric and preparation method thereof

Abstract

The present invention provides a moisture-absorbing and moisture-conducting bio-based polyester fabric and a preparation method thereof. The polyester fabric includes a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer. The composite moisture-absorbing and moisture-conducting layer is a gel layer with a composite gel structure. The pore size of the gel decreases from the fabric layer outward, and the gel layer includes a pectin layer and a pectin / silk layer. The average pore size of the pectin layer is 65-88 μm, and the average pore size of the pectin / silk layer is 40-55 μm. The present invention uses pectin and fibroin to prepare the composite gel structure. The composite gel structure uses pectin gel near the fabric and a pectin / silk composite gel layer away from the fabric. A certain amount of diatomaceous earth is added to form a moisture-absorbing and perspiration-wicking layer with large internal pores and small external pores, similar to a dendritic structure, so that the fabric achieves a moisture-absorbing and perspiration-wicking effect.

Description

Technical Field

[0001] The present invention relates to the field of functional fabrics, and in particular to a moisture-absorbing and moisture-conducting bio-based polyester fabric and a preparation method thereof. Background Art

[0002] Polyester fiber is one of the main types of synthetic fibers. Compared to other synthetic fibers, polyester fiber possesses outstanding physical and chemical properties such as excellent abrasion resistance, high breaking strength, and insect resistance. Furthermore, polyester fiber is relatively dyeable, making it widely used in clothing fabrics and other non-clothing applications. However, polyester fabrics have relatively poor moisture-wicking properties. When worn as clothing in hot and humid environments, sweat cannot be quickly excreted from the body, easily causing the clothing to stick to the skin, making people feel damp and giving them a clammy feeling. Therefore, the moisture-wicking properties of the fabric need to be improved. For the sake of comfort, people desire rapid absorption and transfer of sweat into clothing, as well as rapid evaporation from the surface of the clothing to maintain a dry microclimate between the skin surface and the inside of the clothing. This moisture-wicking function is particularly important in sportswear and summer clothing. In recent years, as consumers increasingly prioritize comfort when purchasing clothing, the demand for moisture-wicking fabrics has rapidly increased. This has also prompted the need to improve the moisture-wicking properties of polyester fabrics to ensure their widespread use.

[0003] Due to its gelling properties, pectin is used as a sizing agent in papermaking and textiles. Pectin can also be used to prepare ultracentrifuge membranes and electrodialysis membranes. In the wood processing industry, pectin can be used as an adhesive. In light industrial production, pectin can be used to make cosmetics and emulsifiers between oil and water. In the textile industry, pectin can replace starch without the need for other auxiliary agents. At present, some people have applied pectin to the finishing of textile fabrics to improve the fabric's anti-ultraviolet performance. However, pectin has excellent water absorption properties and can replace conventional moisture-absorbing and perspiration-wicking agents as a fabric finishing agent. Summary of the Invention

[0004] Technical problem to be solved: The purpose of the present invention is to provide a moisture-absorbing and moisture-conducting bio-based polyester fabric, and pectin and silk are used to prepare a composite gel structure. The composite gel structure uses pectin gel close to the fabric, and a pectin / silk composite gel layer is used away from the fabric, and a certain amount of diatomaceous earth is added to form a moisture-absorbing and perspiration-relieving layer with larger internal pores and smaller external pores, which is similar to a tree-like structure, so that the fabric can achieve the effect of moisture absorption and perspiration.

[0005] Technical solution: A moisture-absorbing and moisture-conducting bio-based polyester fabric, the polyester fabric comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, the composite moisture-absorbing and moisture-conducting layer being a gel layer with a composite gel structure, the pore size of the gel becoming smaller from the fabric layer to the outside, and the gel layer comprising a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 65-88um, and the average pore size of the pectin / silk layer is 40-55um.

[0006] Preferably, the method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0007] S1 according to the bath ratio of 1: 50 ~ 100, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 30 ~ 60min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0008] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a water bath at 60-70°C for 30-60 minutes and stir to fully dissolve it. A pectin solution with a mass fraction of 1.5-5.5% is obtained with good dispersion.

[0009] S3. Apply a certain tension to the polyester fabric and apply the pectin solution to the outer surface of the modified polyester fabric using a coating machine. The polyester fabric is freeze-dried. The surface density of the pectin layer after freeze-drying is 8-15g / m 2 ;

[0010] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution to the freeze-dried pectin layer again for a second freeze-drying. The surface density of the freeze-dried gel layer is 12-20 g / m 2 ;

[0011] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a sericin solution having a concentration of 3-5 wt %, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0012] Preferably, the preparation method of the oxidized pectin comprises the following steps:

[0013] S11. Reacting high-ester pectin in a hydrochloric acid solution at 80-100°C for 150-240 minutes to obtain hydrolyzed pectin;

[0014] S12. The hydrolyzed pectin is added to anhydrous ethanol, and a sodium periodate solution is added to oxidize the pectin. The mass ratio of pectin to sodium periodate is 10:1.2-1.8, to obtain oxidized pectin.

[0015] Preferably, the tension applied to the polyester fabric is 5-8N.

[0016] Preferably, the method for preparing the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0017] S21. Selecting diatomaceous earth with a particle size of 300-500 mesh, activating the diatomaceous earth at 300-500°C for 3-5 hours to obtain activated diatomaceous earth;

[0018] S22. Add oxidized pectin to a 3-5 wt% silk fibroin aqueous solution to achieve a concentration of 1.2-1.8 wt% oxidized pectin. Mix thoroughly. Then, add activated diatomaceous earth (diatomaceous earth to the mixed solution) at a mass ratio of 0.1-0.2 wt%. Ultrasonic stirring is performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

[0019] Preferably, the freeze-drying temperature in step S3 is -10 to -20°C, and the freeze-drying time is 5 to 8 hours.

[0020] Preferably, the freeze-drying temperature in step S4 is -15 to -30°C, and the freeze-drying time is 5 to 10 hours.

[0021] Beneficial effects: The preparation method of the present invention has the following advantages:

[0022] 1. The present invention uses pectin as a moisture absorption and perspiration agent for polyester fabrics. Pectin has an excellent water absorption effect and can quickly absorb and diffuse sweat on the surface of the fabric. In order to make the fabric have a better moisture conduction effect after moisture absorption, the present invention is optimized from two aspects. First, silk fibroin with better water absorption effect is mixed with oxidized pectin. After the pectin is oxidized, aldehyde groups are formed on the surface, and the silk fibroin contains a large number of amino groups. The aldehyde groups and the amino groups can react and are coated on the outside of the pectin layer again. The pectin / silk layer can quickly absorb sweat in the pectin layer; secondly, the pore size in the pectin layer is larger, while the pore size of the pectin / silk layer is smaller. The interface is similar to the shape of a branch diffusion, forming a gradient pore structure, so that the pectin / silk layer can quickly absorb sweat in the pectin layer, and the pectin-silk layer has a larger surface area, which is more conducive to the volatilization of sweat, thereby achieving a quick-drying effect, forming a complete set of moisture absorption-moisture conduction-quick-drying process;

[0023] 2. To enhance moisture conduction and quick-drying properties, activated diatomaceous earth is added to the pectin / silk layer to further enhance the fabric's moisture absorption and perspiration wicking properties.

[0024] 3. In order to make pectin adhere better to the fabric, a certain tension is applied to the fabric. Under the action of tension, the pores between fibers become larger, and the pectin finishing liquid can penetrate into the pores, which is conducive to the moisture absorption of pectin. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with examples, which are provided to explain the present invention and are not limited to the following examples:

[0026] Example 1

[0027] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a gel layer having a composite gel structure, wherein the pore size of the gel decreases from the fabric layer outward, and the gel layer comprises a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 66.7 μm, and the average pore size of the pectin / silk layer is 40.5 μm;

[0028] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0029] S1 according to the bath ratio of 1:50, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 60min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0030] S2. Weigh the oxidized pectin powder and add it to water to prepare a pectin solution. Heat it in a water bath at 60°C for 60 minutes and stir to fully dissolve it to obtain a pectin solution with a mass fraction of 1.5% with good dispersion.

[0031] S3. A pectin solution was applied to the outer surface of the modified polyester fabric using a coating machine while applying a 5N tension. The polyester fabric was then freeze-dried at -10°C for 8 hours. The surface density of the pectin layer after freeze-drying was 8 g / m 2 ;

[0032] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution to the pectin freeze-dried layer again for a second freeze-drying process. The freeze-drying temperature was -30°C and the freeze-drying time was 5 hours. The surface density of the freeze-dried gel layer was 12 g / m 2 ;

[0033] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a 3 wt % sericin solution, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0034] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0035] S11. Reacting high-ester pectin in a hydrochloric acid solution at 80°C for 240 minutes to obtain hydrolyzed pectin;

[0036] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.2 to obtain oxidized pectin.

[0037] The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0038] S21. Selecting diatomaceous earth with a particle size of 300 mesh, the diatomaceous earth was activated at 300 ° C for 5 h to obtain activated diatomaceous earth;

[0039] S22. Oxidized pectin was added to a 3 wt % silk fibroin aqueous solution to a concentration of 1.8 wt %. The mixture was mixed thoroughly. Activated diatomaceous earth was then added at a mass ratio of 0.2 wt % diatomaceous earth to the mixed solution. Ultrasonic stirring was performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

[0040] Example 2

[0041] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a gel layer having a composite gel structure, wherein the pore size of the gel decreases from the fabric layer outward, and the gel layer comprises a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 81.3 μm, and the average pore size of the pectin / silk layer is 52.3 μm;

[0042] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0043] S1 according to the bath ratio of 1:100, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 30min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0044] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a 70°C water bath for 60 min and stir to fully dissolve it. A pectin solution with a mass fraction of 5.5% is obtained with good dispersion.

[0045] S3. Applying 8N of tension to the polyester fabric, a pectin solution was applied to the outer surface of the modified polyester fabric using a coating machine. The polyester fabric was freeze-dried at -20°C for 5 hours. The surface density of the pectin layer after freeze-drying was 15g / m 2 ;

[0046] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution again on the outside of the freeze-dried pectin layer for a second freeze-drying process. The freeze-drying temperature is -15°C and the freeze-drying time is 10 hours. The surface density of the freeze-dried gel layer is 20 g / m 2 ;

[0047] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a 5 wt% sericin solution, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0048] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0049] S11. Reacting high-ester pectin in a hydrochloric acid solution at 100°C for 150 minutes to obtain hydrolyzed pectin;

[0050] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.8, thereby obtaining oxidized pectin.

[0051] The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0052] S21. Selecting diatomaceous earth with a particle size of 500 mesh, the diatomaceous earth was activated at 500 ° C for 3h to obtain activated diatomaceous earth;

[0053] S22. Oxidized pectin was added to a 5 wt% silk fibroin aqueous solution to a concentration of 1.2 wt% and mixed thoroughly. Activated diatomaceous earth was then added at a mass ratio of 0.1 wt% to the mixed solution. Ultrasonic stirring was performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

[0054] Example 3

[0055] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a gel layer having a composite gel structure, wherein the pore size of the gel decreases from the fabric layer outward, and the gel layer comprises a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 66.9 μm, and the average pore size of the pectin / silk layer is 42.3 μm;

[0056] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0057] S1 according to the bath ratio of 1:50, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 50min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0058] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a 40°C water bath for 60 min and stir to fully dissolve it. A 2.2% pectin solution with good dispersion is obtained.

[0059] S3. A pectin solution was applied to the outer surface of the modified polyester fabric using a coating machine while applying a 6N tension. The polyester fabric was then freeze-dried at -20°C for 8 hours. The surface density of the pectin layer after freeze-drying was 14 g / m 2 ;

[0060] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution again on the outside of the freeze-dried pectin layer for a second freeze-drying process. The freeze-drying temperature was -15°C and the freeze-drying time was 9 hours. The surface density of the freeze-dried gel layer was 18 g / m 2 ;

[0061] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a sericin solution having a concentration of 3.6 wt %, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0062] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0063] S11. Reacting high-ester pectin in a hydrochloric acid solution at 80°C for 180 minutes to obtain hydrolyzed pectin;

[0064] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.3, thereby obtaining oxidized pectin.

[0065] The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0066] S21. Diatomaceous earth with a particle size of 300 mesh was selected and activated at 350°C for 4h to obtain activated diatomaceous earth;

[0067] S22. Oxidized pectin was added to a 3.5 wt% silk fibroin aqueous solution to a concentration of 1.6 wt% and mixed thoroughly. Activated diatomaceous earth was then added at a mass ratio of 0.18 wt% to the mixed solution. Ultrasonic stirring was performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

[0068] Example 4

[0069] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a gel layer having a composite gel structure, wherein the pore size of the gel decreases from the fabric layer outward, and the gel layer comprises a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 78.5 μm, and the average pore size of the pectin / silk layer is 52.1 μm;

[0070] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0071] S1 according to the bath ratio of 1:100, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 40min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0072] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a 50°C water bath for 40 min and stir to fully dissolve it. A pectin solution with a mass fraction of 4.5% is obtained with good dispersion.

[0073] S3. A tension of 7 N was applied to the polyester fabric. The pectin solution was then applied to the outer surface of the modified polyester fabric using a coating machine. The polyester fabric was then freeze-dried at -10°C for 7 hours. The surface density of the pectin layer after freeze-drying was 10 g / m 2 ;

[0074] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution to the pectin freeze-dried layer again for a second freeze-drying process. The freeze-drying temperature was -30°C and the freeze-drying time was 6 hours. The surface density of the freeze-dried gel layer was 14 g / m 2 ;

[0075] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a 4.5 wt% sericin solution, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0076] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0077] S11. Reacting high-ester pectin in a hydrochloric acid solution at 100°C for 220 minutes to obtain hydrolyzed pectin;

[0078] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.6, to obtain oxidized pectin.

[0079] The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0080] S21. Select diatomaceous earth with a particle size of 450 mesh and activate the diatomaceous earth at 460°C for 5h to obtain activated diatomaceous earth;

[0081] S22. Oxidized pectin was added to a 4.5 wt% silk fibroin aqueous solution to a concentration of 1.4 wt% and mixed thoroughly. Activated diatomaceous earth was then added at a mass ratio of 0.12 wt% to the mixed solution. Ultrasonic stirring was performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

[0082] Example 5

[0083] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a gel layer having a composite gel structure, wherein the pore size of the gel decreases from the fabric layer outward, and the gel layer comprises a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 75.6 μm, and the average pore size of the pectin / silk layer is 46.9 μm;

[0084] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0085] S1 according to the bath ratio of 1:80, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 45min, the fabric was removed, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0086] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a 45°C water bath for 50 min and stir to fully dissolve it. A pectin solution with a mass fraction of 3.6% is obtained with good dispersion.

[0087] S3. A pectin solution was applied to the outer surface of the modified polyester fabric using a coating machine while applying a tension of 7 N. The polyester fabric was then freeze-dried at -15°C for 8 hours. The surface density of the pectin layer after freeze-drying was 12 g / m 2 ;

[0088] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution to the pectin freeze-dried layer again for a second freeze-drying process. The freeze-drying temperature was -20°C and the freeze-drying time was 8 hours. The surface density of the freeze-dried gel layer was 16 g / m 2 ;

[0089] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a 4 wt% sericin solution, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0090] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0091] S11. Reacting high-ester pectin in a hydrochloric acid solution at 90°C for 200 minutes to obtain hydrolyzed pectin;

[0092] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.4, to obtain oxidized pectin.

[0093] The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0094] S21. Diatomaceous earth with a particle size of 400 mesh was selected and activated at 420°C for 4.5h to obtain activated diatomaceous earth;

[0095] S22. Oxidized pectin was added to a 4.2 wt% silk fibroin aqueous solution to a concentration of 1.5 wt% and mixed thoroughly. Activated diatomaceous earth was then added at a mass ratio of 0.15 wt% to the mixed solution. Ultrasonic stirring was performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

[0096] Comparative Example 1

[0097] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a pectin gel layer, wherein the average pore size of the pectin layer is 81.3 μm;

[0098] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0099] S1 according to the bath ratio of 1:100, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 30min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0100] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a 70°C water bath for 60 min and stir to fully dissolve it. A pectin solution with a mass fraction of 5.5% is obtained with good dispersion.

[0101] S3. Applying 8N of tension to the polyester fabric, a pectin solution was applied to the outer surface of the modified polyester fabric using a coating machine. The polyester fabric was freeze-dried at -20°C for 5 hours. The surface density of the pectin layer after freeze-drying was 15g / m 2 ;

[0102] S4. The outer side of the gel layer of the fabric prepared in step S3 is coated with a 5 wt% sericin solution, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0103] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0104] S11. Reacting high-ester pectin in a hydrochloric acid solution at 100°C for 150 minutes to obtain hydrolyzed pectin;

[0105] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.8, thereby obtaining oxidized pectin.

[0106] Comparative Example 2

[0107] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a gel layer having a composite gel structure, wherein the pore size of the gel decreases from the fabric layer outward, and the gel layer comprises a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 78.5 μm, and the average pore size of the pectin / silk layer is 52.1 μm;

[0108] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0109] S1 according to the bath ratio of 1:100, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 40min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0110] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a 50°C water bath for 40 min and stir to fully dissolve it. A pectin solution with a mass fraction of 4.5% is obtained with good dispersion.

[0111] S3. A tension of 7 N was applied to the polyester fabric. The pectin solution was then applied to the outer surface of the modified polyester fabric using a coating machine. The polyester fabric was then freeze-dried at -10°C for 7 hours. The surface density of the pectin layer after freeze-drying was 10 g / m 2 ;

[0112] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin mixed solution again on the outside of the freeze-dried pectin layer for a second freeze-drying process. The freeze-drying temperature was -30°C and the freeze-drying time was 6 hours. The surface density of the freeze-dried gel layer was 14 g / m 2 ;

[0113] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a 4.5 wt% sericin solution, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0114] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0115] S11. Reacting high-ester pectin in a hydrochloric acid solution at 100°C for 220 minutes to obtain hydrolyzed pectin;

[0116] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.6, to obtain oxidized pectin.

[0117] The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0118] Oxidized pectin was added to a 4.5 wt % silk fibroin aqueous solution to make the concentration of the oxidized pectin in the solution 1.4 wt %, and the mixture was evenly mixed and ultrasonically stirred to obtain a silk fibroin / pectin mixed solution.

[0119] Comparative Example 3

[0120] A moisture-absorbing and moisture-conducting bio-based polyester fabric, comprising a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer, wherein the composite moisture-absorbing and moisture-conducting layer is a gel layer having a composite gel structure, and the gel layer comprises a pectin layer and a pectin / silk layer, wherein the average pore size of the pectin layer is 52.6 μm, and the average pore size of the pectin / silk layer is 49.9 μm;

[0121] The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric comprises the following steps:

[0122] S1 according to the bath ratio of 1:80, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 45min, the fabric was removed, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface;

[0123] S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a 45°C water bath for 50 min and stir to fully dissolve it. A pectin solution with a mass fraction of 6.8% was obtained with good dispersion.

[0124] S3. A pectin solution was applied to the outer surface of the modified polyester fabric using a coating machine while applying a tension of 7 N. The polyester fabric was then freeze-dried at -20°C for 8 hours. The surface density of the pectin layer after freeze-drying was 15.4 g / m 2 ;

[0125] S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution to the pectin freeze-dried layer again for a second freeze-drying process. The freeze-drying temperature was -20°C and the freeze-drying time was 8 hours. The surface density of the freeze-dried gel layer was 16 g / m 2 ;

[0126] S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a 4 wt% sericin solution, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

[0127] Wherein, the preparation method of the oxidized pectin comprises the following steps:

[0128] S11. Reacting high-ester pectin in a hydrochloric acid solution at 90°C for 200 minutes to obtain hydrolyzed pectin;

[0129] S12. The hydrolyzed pectin was added to anhydrous ethanol, and sodium periodate solution was added to oxidize the pectin. The mass ratio of pectin to sodium periodate was 10:1.4, to obtain oxidized pectin.

[0130] The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps:

[0131] S21. Diatomaceous earth with a particle size of 400 mesh was selected and activated at 420°C for 4.5h to obtain activated diatomaceous earth;

[0132] S22. Oxidized pectin was added to a 3.8 wt% silk fibroin aqueous solution to a concentration of 1.3 wt% and mixed thoroughly. Activated diatomaceous earth was then added at a mass ratio of 0.15 wt% to the mixed solution. Ultrasonic stirring was performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

[0133] The polyester fabrics of the same specifications are used in the embodiment of the present invention and the comparative example. The fabric structure is plain weave, the warp density is 44 threads / cm, the weft density is 36 threads / cm, and the gram weight is 132.3g / m 2 .

[0134] Water drop diffusion time and water evaporation rate: according to GB / T21655.1-2008 Evaluation test of moisture absorption and quick-drying properties of textiles.

[0135] Capillary effect: tested according to FZ / T01071-1999 Test method for capillary effect of textiles.

[0136] <![CDATA[Water evaporation rate (g•h -1 )]]> Droplet diffusion time (s) <![CDATA[Wicking effect (cm•min -1 )]]> Example 1 0.35 0 16.7 Example 2 0.36 0 16.9 Example 3 0.38 0 17.1 Example 4 0.35 0 16.6 Example 5 0.37 0 17.0 Comparative Example 1 0.28 0 14.3 Comparative Example 2 0.31 0 15.4 Comparative Example 3 0.31 0 15.5

[0137] From the data in the table, it can be found that the gradient pore structure and the addition of diatomaceous earth are beneficial to the conduction of water.

[0138] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A moisture-absorbing and moisture-conducting bio-based polyester fabric, characterized by: The polyester fabric includes a polyester fabric layer and a composite moisture-absorbing and moisture-conducting layer. The composite moisture-absorbing and moisture-conducting layer is a gel layer with a composite gel structure. The pore size of the gel becomes smaller from the fabric layer to the outside, and the gel layer includes a pectin layer and a pectin / silk fibroin / diatomaceous earth layer. The pectin layer is used close to the fabric, and the pectin / silk fibroin / diatomaceous earth layer is used far from the fabric. The average pore size of the pectin layer is 65-88 μm, and the average pore size of the pectin / silk fibroin / diatomaceous earth layer is 40-55 μm.

2. The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric according to claim 1, characterized in that: The following steps are involved: S1 according to the bath ratio of 1: 50 ~ 100, the polyester fabric was placed in a concentration of 200g / L of sodium hydroxide solution, treated for 30 ~ 60min, remove the fabric, washed and dried to obtain a polyester fabric containing hydroxyl groups on the surface; S2. Weigh oxidized pectin powder and add it to water to prepare a pectin solution. Heat in a water bath at 60-70°C for 30-60 minutes while stirring to fully dissolve the powder, obtaining a pectin solution with a mass fraction of 1.5-5.5%. S3. Apply a certain tension to the polyester fabric and apply the pectin solution to the outer surface of the modified polyester fabric using a coating machine. The polyester fabric is freeze-dried. The surface density of the pectin layer after freeze-drying is 8-15g / m 2 ; S4. Remove the freeze-dried fabric and apply the silk fibroin / pectin / diatomaceous earth mixed solution to the freeze-dried pectin layer again for a second freeze-drying. The surface density of the freeze-dried gel layer is 12-20 g / m 2 ; S5. The outer side of the gel layer of the fabric prepared in step S4 is coated with a sericin solution having a concentration of 3-5 wt %, and dried to obtain a moisture-absorbing and moisture-conducting bio-based polyester fabric.

3. The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric according to claim 2, characterized in that: The preparation method of the oxidized pectin comprises the following steps: S11. Add high-ester pectin to a hydrochloric acid solution and react at 80-100°C for 150-240 minutes to obtain hydrolyzed pectin. S12. The hydrolyzed pectin is added to anhydrous ethanol, and a sodium periodate solution is added to oxidize the pectin. The mass ratio of pectin to sodium periodate is 10:1.2-1.8, to obtain oxidized pectin.

4. The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric according to claim 2, characterized in that: The tension applied to the polyester fabric is 5-8N.

5. The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric according to claim 3, characterized in that: The preparation method of the silk fibroin / pectin / diatomaceous earth mixed solution comprises the following steps: S21. Selecting diatomaceous earth with a particle size of 300-500 mesh, activating the diatomaceous earth at 300-500°C for 3-5 hours to obtain activated diatomaceous earth; S22. Add oxidized pectin to a 3-5 wt% silk fibroin aqueous solution to a concentration of 1.2-1.8 wt% and mix thoroughly. Then, add activated diatomaceous earth (diatomaceous earth to the mixed solution) at a mass ratio of 0.1-0.2 wt%. Ultrasonic stirring is performed to obtain a silk fibroin / pectin / diatomaceous earth mixed solution.

6. The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric according to claim 2, characterized in that: In step S3, the freeze-drying temperature is -20 to -10°C, and the freeze-drying time is 5 to 8 hours.

7. The method for preparing the moisture-absorbing and moisture-conducting bio-based polyester fabric according to claim 2, characterized in that: In step S4, the freeze-drying temperature is -30 to -15°C, and the freeze-drying time is 5 to 10 hours.