Preparation method of fabric containing kapok fibers

Abstract

The invention relates to a preparation method of a fabric containing kapok fibers, which comprises the following steps: firstly, sequentially treating kapok blended yarns by a supercritical carbon dioxide system, soaking the kapok blended yarns in a solution containing polycarboxylic acid, soaking the kapok blended yarns in a cellulose treating agent, carrying out steam explosion treatment, and then spinning the kapok blended yarns and hollow cellulose which are respectively weft yarns and warp yarns into a fabric containing the kapok fibers, and finishing the fabric to obtain the fabric containing the kapok fibers. The hydrophilicity and dye accessibility of the kapok yarn are improved through supercritical carbon dioxide; the polybasic carboxylic acid treatment improves the binding force between the fibers, and improves the problem that the fibers are short and easy to fall off. Meanwhile, the NMMO improves the processability and the using effect of the kapok fibers, steam explosion increases the roughness and the cohesion of the fibers, the air permeability and the softness of the fabric are improved, and finally the problems that the kapok fibers generate fluff and the yarn structure is unstable are solved.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a method for preparing a fabric containing kapok fibers. Background Art

[0002] Kapok, as a seed fiber derived from nature, has shown extraordinary potential in the textile field due to its unique physical structure and chemical composition. The fiber is hollow inside and lightweight, and its surface is smooth and covered with micropores, which not only gives the fabric excellent warmth retention properties, but also makes the fabric have good air permeability and humidity regulation capabilities. What is even more rare is that the flavonoids and triterpenoids contained in kapok fibers give it natural antibacterial properties, providing valuable resources for the development of functional textiles.

[0003] However, despite the many advantages of kapok fiber, its wide application in textile processing, especially in the field of home textile fabrics, is significantly limited. This is mainly due to several inherent defects of kapok fiber itself: first, the relative torsional stiffness of kapok fiber is relatively large, and the fiber length is relatively short, resulting in insufficient cohesion between fibers, making it difficult to effectively form a stable yarn structure; second, during the spinning and subsequent weaving process, kapok fiber is easily affected by friction and produces lint, which not only affects the appearance quality of the fabric, but also may cause frequent yarn breakage and shutdown of the loom, seriously reducing production efficiency. Summary of the invention

[0004] The purpose of the invention is to modify the kapok blended yarn while maintaining the warmth, lightness and antibacterial properties of the kapok blended yarn itself, so as to solve the problems of unstable yarn structure, easy yarn breakage and weaving stoppage.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions: The present application provides a method for preparing a fabric containing kapok fibers, comprising the following steps: S1, treating the kapok blended yarn in supercritical carbon dioxide; S2, placing the kapok blended yarn treated in step S1 in a solution containing a polycarboxylic acid for padding, a first-stage baking reaction, a second-stage baking reaction, washing, and drying; S3, soaking the kapok blended yarn after the treatment in step S2 in a cellulose treatment agent, and then performing a steam flash explosion treatment, washing, and drying; S4, using the hollow cellulose as the warp yarn and the kapok blended yarn treated in step S3 as the weft yarn to weave to obtain a fabric containing kapok fibers, and then subjecting the fabric to a finishing process to obtain a fabric containing kapok fibers.

[0006] As a further improvement of the present application, in step S1, the supercritical carbon dioxide system is achieved by injecting carbon dioxide into a container at a preset pressure, the injection rate of the carbon dioxide is 2 to 4 ml / min, and the preset pressure is 15 to 25 MPa.

[0007] As a further improvement of the present application, the method further comprises the step of simultaneously injecting a co-solvent into the container, wherein the injection speed of the co-solvent is 0.5 to 1.5 ml / min.

[0008] As a further improvement of the present application, the co-solvent comprises both a polar co-solvent and a non-polar or weakly polar co-solvent, and the co-solvent can be, but is not limited to, a combination of anhydrous ethanol, acetone, methanol, n-heptane, n-hexane, and the like.

[0009] As a further improvement of the present application, the bath ratio of the kapok blended yarn to the solution containing polycarboxylic acid is 1:10 to 1:20 in terms of mass percentage, the solution containing polycarboxylic acid contains polycarboxylic acid with a concentration of 20 to 50 g / L and a catalyst with a concentration of 4 to 12 g / L, the liquid rate after the dipping is 60% to 100%, the temperature of the first stage baking reaction is 50 to 85°C, the time of the first stage baking reaction is 1 to 10 minutes, the temperature of the second stage baking reaction is 120 to 170°C, and the time of the second stage baking reaction is 1 to 10 minutes. Preferably, the dipping and rolling is performed twice by using a dipping machine.

[0010] As a further improvement of the present application, the polycarboxylic acid may be but is not limited to any one of butanetetracarboxylic acid, maleic acid, tartaric acid, etc., and the catalyst is sodium hypophosphite.

[0011] As a further improvement of the present application, in step S3, the bath ratio of the kapok blended yarn to the cellulose treating agent is 1:10 to 1:20, measured in percentage by mass, the immersion temperature is 20°C to 85°C, the immersion time is 5 to 30 minutes, and the cellulose treating agent is N-methylmorpholine-N-oxide.

[0012] As a further improvement of the present application, the mass percentage of the N-methylmorpholine-N-oxide is 20% to 80%.

[0013] As a further improvement of the present application, in step S3, the pressure of the steam flash explosion treatment is 0.5 MPa to 5 MPa, and the time of the steam flash explosion treatment is 1 to 10 min.

[0014] As a further improvement of the present application, in step S1, the kapok blended yarn is blended with kapok fiber and at least one of cotton, wool and acrylic fiber.

[0015] The beneficial effects of the present application are as follows: The present application provides a method for preparing a fabric containing kapok fiber, wherein the kapok blended yarn is sequentially treated with a supercritical carbon dioxide system, soaked in a solution containing a polycarboxylic acid, soaked in a cellulose treating agent, and treated with steam flash explosion, and then woven with hollow cellulose as weft yarn and warp yarn, respectively, to form a fabric containing kapok fiber, and then the fabric is subjected to a finishing process to obtain a fabric containing kapok fiber.

[0016] Supercritical carbon dioxide is used to penetrate the yarn to dissolve wax and pectin, thereby improving the hydrophilicity and dye accessibility of the yarn. Polycarboxylic acid is used as a cross-linking agent to react with cellulose fibers to form a stable cross-linked structure, which improves the problem of kapok fibers being easily detached due to their large torsional stiffness, short length, and smooth surface, forming fluff. It also has a positive effect on improving weaving efficiency, fabric wrinkle resistance, and dimensional stability. The physical properties are optimized by NMMO aqueous solution, which can open the hydrogen bonds on the surface of cellulose and release the active group-hydroxyl, thereby improving the processing performance and use effect of kapok fibers. Steam flash explosion destroys the cellulose structure through instantaneous pressure relief, increases the roughness, volume, and cohesion of the fiber surface, and increases the micropore size, thereby improving the air permeability and softness of the fabric. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solution of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with specific implementation methods.

[0019] A method for preparing a fabric containing kapok fiber comprises the following steps: S1. Treat the kapok blended yarn in a supercritical carbon dioxide system; wherein: the kapok blended yarn is blended with kapok fiber and at least one of cotton, wool, and acrylic fiber; the supercritical carbon dioxide system is achieved by injecting carbon dioxide into a container under a preset pressure, the injection rate of the carbon dioxide is 2 to 4 ml / min, and the preset pressure is 15 to 25 MPa. In an optional embodiment, it also includes the step of injecting a co-solvent into the container at the same time, the injection rate of the co-solvent is 0.5 to 1.5 ml / min, and the co-solvent can be but is not limited to at least one of anhydrous ethanol, n-heptane, acetone, and methanol.

[0020] S2, placing the kapok blended yarn treated in step S1 in a solution containing polycarboxylic acid for padding, first stage baking reaction, second stage baking reaction, washing, and drying; in terms of mass percentage, the bath ratio of the kapok blended yarn to the solution containing polycarboxylic acid is 1:10-1:20, the solution containing polycarboxylic acid contains polycarboxylic acid with a concentration of 20-50 g / L and a catalyst with a concentration of 4-12 g / L, the padding is performed twice by dipping and rolling using a dipping machine, the liquid rate after dipping is 60%-100%, the temperature of the first stage baking reaction is 50-85°C, the time of the first stage baking reaction is 1-10 min, the temperature of the second stage baking reaction is 120-170°C, and the time of the second stage baking reaction is 1-10 min. In an optional embodiment, the polycarboxylic acid can be but not limited to any one of butanetetracarboxylic acid, maleic acid, and tartaric acid, and the catalyst can be but not limited to sodium hypophosphite.

[0021] S3, soaking the kapok blended yarn after the treatment in step S2 in a cellulose treatment agent, and then steam flash explosion treatment, washing, and drying; wherein: in terms of mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:10 to 1:20, the soaking temperature is 20°C to 85°C, the soaking time is 5 to 30 minutes, the cellulose treatment agent is N-methylmorpholine-N-oxide, and preferably, the mass percentage of the N-methylmorpholine-N-oxide is 20% to 80%. In an optional embodiment, the pressure of the steam flash explosion treatment is 0.5MPa to 5MPa, and the time of the steam flash explosion treatment is 1 to 10 minutes.

[0022] S4, using hollow cellulose as warp yarn and kapok blended yarn treated in step S3 as weft yarn, weaving to obtain a fabric containing kapok fiber, and then subjecting the fabric to a finishing process to obtain a fabric containing kapok fiber. In an optional embodiment, in step S1, the kapok blended yarn is blended from kapok fiber and at least one of cotton, wool, and acrylic. Kapok fiber is light in weight, short in length, smooth in surface, large in rigidity, and poor in cohesion. Without treatment, pure spinning is very difficult. In the kapok blended yarn, other fibers will wrap the kapok fiber into yarn for subsequent weaving. Preferably, the mass percentage of the kapok fiber in the kapok blended yarn is 50%. The high density and low viscosity characteristics of supercritical carbon dioxide enable it to penetrate the yarn like a liquid, while maintaining the diffusivity of the gas, and quickly and evenly acting on the surface and interior of the yarn. It can not only dissolve wax and pectin, but also break the intermolecular forces of these hydrophobic substances, causing them to detach from the yarn surface, significantly improving the hydrophilicity of the yarn and the accessibility of dye molecules, creating favorable conditions for subsequent dyeing and finishing processes.

[0023] The addition of cosolvents, such as anhydrous ethanol and n-heptane, further enhances the solubility of supercritical carbon dioxide, promotes the dissolution of wax, pectin and other substances, and improves the processing efficiency and effect. Therefore, the cosolvent and supercritical carbon dioxide work together to improve the processing quality of kapok blended yarn.

[0024] Polycarboxylic acids are mainly used as crosslinking agents in textile processing. They react with cellulose fibers through esterification and crosslinking through multiple carboxyl groups in their molecules, thereby reducing the problem of yarn breakage during weaving. The reaction principle is roughly as follows: polycarboxylic acids dehydrate at high temperatures to form anhydride intermediates. Subsequently, under the action of a catalyst, the anhydride reacts with the hydroxyl groups on the cellulose fibers to form a stable crosslinking structure, reducing the chance of single fiber slippage. The crosslinking between them forms a fiber barrier. This can not only improve weaving efficiency and reduce fiber loss, but also improve the wrinkle resistance of the fabric and enhance its dimensional stability.

[0025] As a highly effective cellulose treatment agent, N-methylmorpholine-N-oxide (NMMO) aqueous solution has the core function of destroying the hydrogen bond structure between cellulose molecules, releasing the originally bound active groups, and providing more reaction sites for subsequent treatment. It increases the amorphous area of ​​cellulose and improves its regain, causing the fiber to swell moderately and enhancing the fiber's flexibility.

[0026] Steam explosion treatment mainly uses high-temperature and high-pressure steam to instantly release the pressure on the cellulose in the kapok blended yarn. Under high temperature and high pressure, part of the hemicellulose is degraded, part of the lignin is softened or degraded, and the roughness of the fiber surface increases. When the pressure is released instantly, the water vapor that penetrates into the cellulose rapidly expands and breaks through the cellulose structure, causing friction and collision between the microfibrils and crystal cells, reducing the crystallinity of the fibers, and causing swelling and a large number of cracks and holes. In other words, steam explosion causes physical and chemical changes in the fibers through high temperature, high pressure and rapid pressure release, including hemicellulose degradation, lignin softening, and roughening of the fiber surface and reduced crystallinity. These changes not only promote the penetration of the solution into the fibers in subsequent treatment or dyeing, but also increase the roughness of the fiber surface, thereby enhancing the cohesion between the fibers. At the same time, the expanded fibers also increase the micropore size.

[0027] Example 1 This embodiment provides a method for preparing a fabric containing kapok fibers, comprising the following steps: S1. Place the kapok blended yarn in a high-pressure container with a pressure of 15 MPa, inject carbon dioxide into the high-pressure container at a rate of 2 ml / min, and inject anhydrous ethanol and n-heptane into the high-pressure container at a rate of 0.5 ml / min, and the treatment time is 300 minutes. Among them: in the selected kapok blended yarn, the kapok fiber is 50% and the cotton is 50% by mass percentage.

[0028] S2. The kapok blended yarn treated in step S1 is placed in a solution containing a polycarboxylic acid for immersion and rolling, a first stage of baking reaction, a second stage of baking reaction, washing, and drying; in terms of mass percentage, the bath ratio of the kapok blended yarn to the solution containing a polycarboxylic acid is 1:10, the solution containing a polycarboxylic acid contains polymaleic acid with a concentration of 20 g / L and sodium hypophosphite with a concentration of 4 g / L, the immersion and rolling is performed twice by a immersion and rolling machine, the liquid carrying rate after the immersion and rolling is 60%, the temperature of the first stage of baking reaction is 50° C., the time of the first stage of baking reaction is 1 min, the temperature of the second stage of baking reaction is 80° C., and the time of the second stage of baking reaction is 3 min.

[0029] S3, soaking the kapok blended yarn treated in step S2 in a cellulose treatment agent, and then performing steam explosion treatment, washing, and drying; wherein: in terms of mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:10, the soaking temperature is 20° C., the soaking time is 5 min, the cellulose treatment agent is N-methylmorpholine-N-oxide, and the mass percentage of the N-methylmorpholine-N-oxide is 20%. The pressure of the steam explosion treatment is 0.5 MPa, and the time of the steam explosion treatment is 1 min.

[0030] S4, using hollow cellulose as warp yarn and kapok blended yarn treated in step S3 as weft yarn to weave to obtain kapok fiber-containing fabric, and then subjecting the fabric to a finishing process to obtain kapok fiber-containing fabric, wherein the finishing process includes singeing, enzyme desizing, scalding and bleaching, and dyeing steps, and the singeing, enzyme desizing, scalding and bleaching, and dyeing steps all adopt conventional technical means in the textile field. Specifically, In the singeing step: two positive and two negative singeing methods are adopted, the speed of the singeing machine is 90m / min, and steam fire extinguishing is adopted after burning.

[0031] In the enzyme desizing step: the enzyme working solution used contains amylase at a concentration of 1 g / L, the pH value of the enzyme working solution is 5.5, the temperature of the enzyme desizing treatment is 55° C., and the time of the enzyme desizing treatment is 16 hours.

[0032] In the scouring and bleaching step: the scouring and bleaching working solution contains a refining agent with a concentration of 6g / L, a hydrogen peroxide with a concentration of 5g / L, a hydrogen peroxide stabilizer with a concentration of 2g / L, and a caustic soda with a concentration of 1g / L. The temperature of the scouring and bleaching working solution is 95°C, and the scouring and bleaching treatment time is 4h.

[0033] In the dyeing step: the bath ratio of the fabric to the dyeing solution is 1:10, based on the mass percentage, and the dyeing solution contains anhydrous sodium sulfate with a concentration of 15 g / L and soda ash with a concentration of 3 g / L.

[0034] Example 2 This embodiment provides a method for preparing a fabric containing kapok fibers, comprising the following steps: S1. Place the kapok blended yarn in a high-pressure container with a pressure of 25 MPa, inject carbon dioxide into the high-pressure container at a rate of 4 ml / min, and inject anhydrous ethanol and n-heptane into the high-pressure container at a rate of 1.5 ml / min, and the treatment time is 300 minutes. Among them: in the selected kapok blended yarn, the kapok fiber is 50% and the cotton is 50% by mass percentage.

[0035] S2. The kapok blended yarn treated in step S1 is placed in a solution containing a polycarboxylic acid for immersion and rolling, a first stage of baking reaction, a second stage of baking reaction, washing, and drying; in terms of mass percentage, the bath ratio of the kapok blended yarn to the solution containing a polycarboxylic acid is 1:20, the solution containing a polycarboxylic acid contains polymaleic acid with a concentration of 50 g / L and sodium hypophosphite with a concentration of 12 g / L, the immersion and rolling is performed twice by a immersion and rolling machine, the liquid carrying rate after the immersion and rolling is 100%, the temperature of the first stage of baking reaction is 85° C., the time of the first stage of baking reaction is 10 min, the temperature of the second stage of baking reaction is 100° C., and the time of the second stage of baking reaction is 8 min.

[0036] S3, soaking the kapok blended yarn treated in step S2 in a cellulose treatment agent, and then performing steam explosion treatment, washing, and drying; wherein: in terms of mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:20, the soaking temperature is 85° C., the soaking time is 30 min, the cellulose treatment agent is N-methylmorpholine-N-oxide, and the mass percentage of the N-methylmorpholine-N-oxide is 80%. The pressure of the steam explosion treatment is 5 MPa, and the time of the steam explosion treatment is 10 min.

[0037] S4, using hollow cellulose as warp yarn and kapok blended yarn treated in step S3 as weft yarn to weave to obtain kapok fiber-containing fabric, and then subjecting the fabric to a finishing process to obtain kapok fiber-containing fabric, wherein the finishing process includes singeing, enzyme desizing, scalding and bleaching, and dyeing steps, and the singeing, enzyme desizing, scalding and bleaching, and dyeing steps all adopt conventional technical means in the textile field. Specifically, In the singeing step: two positive and two negative singeing methods are adopted, the speed of the singeing machine is 110m / min, and steam fire extinguishing is adopted after burning.

[0038] In the enzyme desizing step: the enzyme working solution used contains amylase at a concentration of 3 g / L, the pH value of the enzyme working solution is 5.5, the temperature of the enzyme desizing treatment is 55° C., and the time of the enzyme desizing treatment is 20 h.

[0039] In the scouring and bleaching step: the scouring and bleaching working solution contains a refining agent with a concentration of 8g / L, a hydrogen peroxide with a concentration of 6g / L, a hydrogen peroxide stabilizer with a concentration of 3g / L, and a caustic soda with a concentration of 2g / L. The temperature of the scouring and bleaching working solution is 100°C, and the scouring and bleaching treatment time is 4h.

[0040] In the dyeing step: the bath ratio of the fabric to the dyeing solution is 1:10, based on the mass percentage, and the dyeing solution contains 40 g / L of anhydrous sodium sulfate and 6 g / L of soda ash.

[0041] Example 3 This embodiment provides a method for preparing a fabric containing kapok fibers, comprising the following steps: S1. Place the kapok blended yarn in a high-pressure container with a pressure of 20 MPa, inject carbon dioxide into the high-pressure container at a rate of 3 ml / min, and inject anhydrous ethanol and n-heptane into the high-pressure container at a rate of 1 ml / min, and the treatment time is 300 minutes. Among them: in the selected kapok blended yarn, the kapok fiber is 50% and the cotton is 50% by mass percentage.

[0042] S2. The kapok blended yarn treated in step S1 is placed in a solution containing a polycarboxylic acid for immersion and rolling, a first stage of baking reaction, a second stage of baking reaction, washing, and drying; in terms of mass percentage, the bath ratio of the kapok blended yarn to the solution containing a polycarboxylic acid is 1:20, the solution containing a polycarboxylic acid contains polymaleic acid with a concentration of 50 g / L and sodium hypophosphite with a concentration of 5 g / L, the immersion and rolling are performed twice by a immersion and rolling machine, the liquid carrying rate after the immersion and rolling is 80%, the temperature of the first stage of baking reaction is 80° C., the time of the first stage of baking reaction is 3 min, the temperature of the second stage of baking reaction is 90° C., and the time of the second stage of baking reaction is 4 min.

[0043] S3, soaking the kapok blended yarn treated in step S2 in a cellulose treatment agent, and then performing steam explosion treatment, washing, and drying; wherein: in terms of mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:20, the soaking temperature is 55° C., the soaking time is 10 min, the cellulose treatment agent is N-methylmorpholine-N-oxide, and the mass percentage of the N-methylmorpholine-N-oxide is 70%. The pressure of the steam explosion treatment is 1.5 MPa, and the time of the steam explosion treatment is 1 min.

[0044] S4, using hollow cellulose as warp yarn and kapok blended yarn treated in step S3 as weft yarn to weave to obtain kapok fiber-containing fabric, and then subjecting the fabric to a finishing process to obtain kapok fiber-containing fabric, wherein the finishing process includes singeing, enzyme desizing, scalding and bleaching, and dyeing steps, and the singeing, enzyme desizing, scalding and bleaching, and dyeing steps all adopt conventional technical means in the textile field. Specifically, In the singeing step: two positive and two negative singeing methods are adopted, the speed of the singeing machine is 100m / min, and steam fire is extinguished after burning.

[0045] In the enzyme desizing step: the enzyme working solution used contains amylase at a concentration of 2 g / L, the pH value of the enzyme working solution is 5.5, the temperature of the enzyme desizing treatment is 55° C., and the time of the enzyme desizing treatment is 18 hours.

[0046] In the scouring and bleaching step: the scouring and bleaching working solution contains a refining agent with a concentration of 7g / L, a hydrogen peroxide with a concentration of 5.5g / L, a hydrogen peroxide stabilizer with a concentration of 2.5g / L, and a caustic soda with a concentration of 1.5g / L. The temperature of the scouring and bleaching working solution is 100°C, and the scouring and bleaching treatment time is 4h.

[0047] In the dyeing step: the bath ratio of the fabric to the dyeing solution is 1:10, based on the mass percentage, and the dyeing solution contains anhydrous sodium sulfate with a concentration of 25 g / L and soda ash with a concentration of 5 g / L.

[0048] Comparative Example 1 The difference between this comparative example and Example 3 is that the processing of step S1 is not performed.

[0049] Comparative Example 2 The difference between this comparative example and Example 3 is that the processing of step S2 is not performed.

[0050] Comparative Example 3 The difference between this comparative example and Example 3 is that the processing of step S3 is not performed.

[0051] Comparative Example 4 The difference between this comparative example and Example 3 is that the processing of steps S1 to S3 is not performed.

[0052] The weaving efficiency, deodorization and warmth retention performance of Examples 1-3 and Comparative Examples 1-4 were tested in the following manner: (1) Weaving efficiency: After the yarn is put on the weaving machine, the loom will automatically calculate the operating efficiency.

[0053] (2) Deodorization: The concentration reduction rate was determined with reference to GB / T 33610.1-2019 “Determination of deodorizing properties of textiles Part 1: General principles”.

[0054] (3) Keep warm: The determination was carried out with reference to GB / T 35762-2017 “Test method for thermal transfer properties of textiles - Flat plate method”.

[0055] The test results are shown in Table 1.

[0056] Table 1:

[0057] Through the comparison of the data in Table 1, it can be seen that after the kapok blended yarn is treated with a supercritical carbon dioxide system, immersed in a solution containing a polycarboxylic acid, immersed in a cellulose treating agent, and treated with a steam flash explosion, the weaving efficiency and thermal insulation performance of the kapok blended yarn are improved while maintaining the excellent antibacterial effect of the kapok blended yarn.

[0058] In summary, the kapok blended yarn was treated with a supercritical carbon dioxide solvent system to reduce the hydrophobic substances such as wax and pectin on the surface of the kapok blended yarn, increase the accessibility of its aqueous solution, and improve the subsequent treatment and dyeing effects.

[0059] The immersion treatment of polycarboxylic acids can increase the connection between fibers, reduce the disengagement of kapok blended yarn during weaving or use, reduce the loss of kapok during weaving or use, improve weaving efficiency, and help save costs. The high content of kapok fibers in the fabric helps to retain still air. Although the cross-linking treatment of cellulose fibers by polycarboxylic acids reduces the deodorizing effect of the fabric, it increases the warmth retention effect.

[0060] The crystallinity of kapok fiber is 33%, which is lower than the 54% of cotton fiber, and the fiber has more pores. Compared with cotton, it is more effective to treat kapok blended yarn containing kapok fiber with cellulose treatment agent, which can increase the active groups and amorphous areas of kapok blended yarn. Steam flash treatment increases the roughness of the fiber surface, increases the fiber diameter and surface roughness in kapok blended yarn, thereby enhancing the holding force between fibers and reducing fiber loss. At the same time, steam flash treatment can produce a large number of micropores, which enhances the ability of kapok blended yarn to absorb odor.

[0061] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0062] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.

Claims

1. A method for preparing a fabric containing kapok fiber, characterized in that: The steps include: S1. treating the kapok blended yarn in a supercritical carbon dioxide system; S2, placing the kapok blended yarn treated in step S1 in a solution containing a polycarboxylic acid for padding, a first-stage baking reaction, a second-stage baking reaction, washing, and drying; S3, soaking the kapok blended yarn after the treatment in step S2 in a cellulose treatment agent, and then performing steam flash explosion treatment, washing, and drying; S4, using the hollow cellulose as the warp yarn and the kapok blended yarn treated in step S3 as the weft yarn to weave to obtain a fabric containing kapok fibers, and then subjecting the fabric to a finishing process to obtain a fabric containing kapok fibers.

2. The method for preparing a fabric containing kapok fiber according to claim 1, characterized in that: In step S1, the supercritical carbon dioxide system is achieved by injecting carbon dioxide into a container at a preset pressure, the injection rate of the carbon dioxide is 2-4 ml / min, and the preset pressure is 15-25 MPa.

3. The method for preparing the fabric containing kapok fiber according to claim 2, characterized in that: The method also includes the step of injecting a co-solvent into the container at the same time, wherein the injection speed of the co-solvent is 0.5 to 1.5 ml / min.

4. The method for preparing the fabric containing kapok fiber according to claim 3, characterized in that: The co-solvent is a combination of a polar co-solvent and a non-polar or weakly polar co-solvent.

5. The method for preparing the fabric containing kapok fiber according to claim 1, characterized in that: In step S2, the bath ratio of the kapok blended yarn to the solution containing polycarboxylic acid is 1:10 to 1:20, measured in percentage by mass, the solution containing polycarboxylic acid contains polycarboxylic acid with a concentration of 20 to 50 g / L and a catalyst with a concentration of 4 to 12 g / L, the liquid rate after impregnation is 60% to 100%, the temperature of the first stage baking reaction is 50 to 85°C, the time of the first stage baking reaction is 1 to 10 min, the temperature of the second stage baking reaction is 120 to 170°C, and the time of the second stage baking reaction is 1 to 10 min.

6. The method for preparing the fabric containing kapok fiber according to claim 5, characterized in that: The polycarboxylic acid is any one of butanetetracarboxylic acid, maleic acid and tartaric acid, and the catalyst is sodium hypophosphite.

7. The method for preparing a fabric containing kapok fiber according to claim 1, characterized in that: In step S3, the bath ratio of the kapok blended yarn to the cellulose treating agent is 1:10-1:20, measured in percentage by mass, the immersion temperature is 20° C.-85° C., the immersion time is 5-30 min, and the cellulose treating agent is N-methylmorpholine-N-oxide.

8. The method for preparing the fabric containing kapok fiber according to claim 7, characterized in that: The mass percentage of the N-methylmorpholine-N-oxide is 20% to 80%.

9. The method for preparing a fabric containing kapok fiber according to claim 1, characterized in that: In step S3, the pressure of the steam explosion treatment is 0.5 MPa to 5 MPa, and the time of the steam explosion treatment is 1 to 10 minutes.

10. The method for preparing a fabric containing kapok fiber according to claim 1, characterized in that: In step S1, the kapok blended yarn is blended with kapok fiber and at least one of cotton, wool and acrylic fiber.

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