Preparation method of a fabric containing kapok fiber

Abstract

The present invention relates to a preparation method of a fabric containing kapok fiber. First, the kapok blended yarn is successively treated through a supercritical carbon dioxide system, soaked in a solution containing polycarboxylic acid, soaked in a cellulose treatment agent, and subjected to steam explosion treatment. Then, it is woven with hollow cellulose as the weft yarn and warp yarn respectively to form a fabric containing kapok fiber. After the fabric is subjected to a finishing process, a fabric containing kapok fiber is obtained. The hydrophilicity and dye accessibility of the kapok yarn are improved through supercritical carbon dioxide; the polycarboxylic acid treatment improves the fiber-to-fiber binding force and solves the problem of easy detachment due to short length. At the same time, NMMO improves the processing performance and usage effect of kapok fiber, and steam explosion increases the fiber roughness and cohesion, improving the air permeability and softness of the fabric, and finally solving the problems of fluff generation of kapok fiber and unstable yarn structure.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, and particularly relates to a preparation method of a fabric containing kapok fiber. Background Art

[0002] Kapok, as a natural seed fiber, shows extraordinary potential in the textile field due to its unique physical structure and chemical composition. Its fibers are hollow inside, light in weight, and have a smooth surface covered with fine pores, which not only endows the fabric with excellent heat preservation performance but also makes the fabric have good air permeability and humidity regulation ability. More rarely, the flavonoids and triterpenoids contained in kapok fibers endow it with 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, has been significantly limited. This is mainly due to several inherent defects of kapok fiber itself: First, the relative torsional stiffness of kapok fiber is large and the fiber length is relatively short, resulting in insufficient cohesion between fibers and making it difficult to effectively form a stable yarn structure; Second, during the spinning and subsequent weaving processes, kapok fiber is easily affected by friction and generates fluff, which not only affects the appearance quality of the fabric but also may cause frequent yarn breakage and machine stoppage in the loom, seriously reducing production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to modify the kapok blended yarn on the premise of maintaining the heat preservation, 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 machine stoppage.

[0005] To achieve the above purpose, the present application is realized through the following technical solutions:

[0006] The present application provides a preparation method of a fabric containing kapok fiber, including the following steps:

[0007] S1. Place the kapok blended yarn in supercritical carbon dioxide for treatment;

[0008] S2. Immerse and roll the kapok blended yarn treated in step S1 in a solution containing polycarboxylic acid, perform the first-stage baking reaction, the second-stage baking reaction, wash, and dry;

[0009] S3. First immerse the kapok blended yarn treated in step S2 in a cellulose treatment agent, then perform steam explosion treatment, wash, and dry;

[0010] S4. Use hollow cellulose as the warp yarn and the kapok blended yarn after being processed in step S3 as the weft yarn for weaving to obtain a fabric containing kapok fibers, and then perform a finishing process on the fabric to obtain a fabric containing kapok fibers.

[0011] 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 under a preset pressure. The injection rate of the carbon dioxide is 2 - 4 ml / min, and the preset pressure is 15 - 25 MPa.

[0012] As a further improvement of the present application, it further includes a step of simultaneously injecting a co - solvent into the container. The injection rate of the co - solvent is 0.5 - 1.5 ml / min.

[0013] As a further improvement of the present application, the co - solvent simultaneously includes a polar co - solvent and a non - polar or weakly polar co - solvent. The co - solvent can be but is not limited to combinations such as anhydrous ethanol, acetone, methanol, n - heptane, n - hexane, etc.

[0014] As a further improvement of the present application, 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 liquor - pickup rate after padding is 60% - 100%. The temperature of the first - stage baking reaction is 50 - 85 °C, and 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. Preferably, the padding is carried out by two impregnations and two rollings using a padding mangle.

[0015] As a further improvement of the present application, the polycarboxylic acid can be but is not limited to any one of butanetetracarboxylic acid, maleic acid, tartaric acid, etc. The catalyst is sodium hypophosphite.

[0016] As a further improvement of the present application, in step S3, in terms of mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:10 - 1:20. The temperature of the soaking is 20 °C - 85 °C, and the time of the soaking is 5 - 30 min. The cellulose treatment agent is N - methylmorpholine - N - oxide.

[0017] As a further improvement of the present application, the mass percentage of N - methylmorpholine - N - oxide is 20% - 80%.

[0018] As a further improvement of the present application, in step S3, the pressure of the steam flash - explosion treatment is 0.5 MPa - 5 MPa, and the time of the steam flash - explosion treatment is 1 - 10 min.

[0019] 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.

[0020] The beneficial effects of the present application are as follows: The present application provides a method for preparing a fabric containing kapok fiber. First, the kapok blended yarn is sequentially treated through a supercritical carbon dioxide system, soaked in a solution containing polycarboxylic acid, soaked in a cellulose treatment agent, and subjected to steam explosion treatment. Then, it is woven with hollow cellulose as the weft yarn and warp yarn respectively to form a fabric containing kapok fiber. After the fabric is subjected to a finishing process, a fabric containing kapok fiber is obtained.

[0021] The supercritical carbon dioxide penetrates the yarn to dissolve wax and pectin, improving the hydrophilicity and dye accessibility of the yarn. Polycarboxylic acid is used as a crosslinking agent to undergo an esterification reaction with cellulose fibers to form a stable crosslinked structure, improving the problem that kapok fibers are prone to slipping out and forming fluff due to their large torsional stiffness, short length, and smooth surface, and also having a positive impact on improving weaving efficiency, fabric wrinkle resistance, and dimensional stability. The physical properties are optimized through an NMMO aqueous solution. The NMMO aqueous solution can break the hydrogen bonds on the surface of cellulose and release the active group - hydroxyl, thereby improving the processing performance and usage effect of kapok fibers. Steam explosion destroys the cellulose structure by instantaneously releasing pressure, increasing the surface roughness, volume, and cohesion of the fibers, while also increasing the micro pore diameter and improving the air permeability and softness of the fabric. Specific embodiments

[0022] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0023] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with specific embodiments.

[0024] A method for preparing a fabric containing kapok fiber, comprising the following steps:

[0025] S1. Place the kapok blended yarn in a supercritical carbon dioxide system for treatment; wherein: the kapok blended yarn is blended from kapok fibers and at least one of cotton, wool, and acrylic; 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 - 4 ml / min, and the preset pressure is 15 - 25 MPa. In an alternative embodiment, it further includes the step of injecting a cosolvent into the container simultaneously, the injection rate of the cosolvent is 0.5 - 1.5 ml / min, and the cosolvent can be but not limited to at least one of absolute ethanol, n-heptane, acetone, and methanol.

[0026] S2. Immerse and pad the kapok blended yarn treated in step S1 in a solution containing polycarboxylic acid, conduct the first-stage baking reaction, the second-stage baking reaction, wash, and dry; by 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 carried out twice by a padding machine for impregnation and twice for rolling, the liquor pickup rate after padding 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 alternative 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.

[0027] S3. First immerse the kapok blended yarn treated in step S2 in a cellulose treatment agent and then conduct steam explosion treatment, wash, and dry; wherein: by mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:10 - 1:20, the temperature of the immersion is 20 °C - 85 °C, the time of the immersion is 5 - 30 min, the cellulose treatment agent is N-methylmorpholine-N-oxide, preferably, the mass percentage of N-methylmorpholine-N-oxide is 20% - 80%. In an alternative embodiment, the pressure of the steam explosion treatment is 0.5 MPa - 5 MPa, and the time of the steam explosion treatment is 1 - 10 min.

[0028] S4. Use hollow cellulose as the warp yarn and the kapok blended yarn after being processed in step S3 as the weft yarn for weaving to obtain a fabric containing kapok fibers, and then perform finishing operations on the fabric to obtain a fabric containing kapok fibers. In an alternative embodiment, in step S1, the kapok blended yarn is spun from kapok fibers and at least one of cotton, wool, and acrylic. Kapok fibers are light in weight, short in length, smooth on the surface, high in stiffness, and poor in cohesion. Without treatment, pure spinning is very difficult. In the kapok blended yarn, other fibers will wrap the kapok fibers to form yarns for subsequent weaving. Preferably, the mass percentage of the kapok fibers 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, acting quickly and evenly on the surface and inside of the yarn. It can not only dissolve waxes and pectins but also break the intermolecular forces of these hydrophobic substances, causing them to detach from the yarn surface, significantly enhancing the hydrophilicity of the yarn and the accessibility of dye molecules, creating favorable conditions for subsequent dyeing and finishing operations.

[0029] The addition of co-solvents, such as absolute ethanol and n-heptane, further enhances the dissolving ability of supercritical carbon dioxide, promotes the dissolution of substances such as waxes and pectins, and improves the treatment efficiency and effect. Therefore, the co-solvent and supercritical carbon dioxide act synergistically to jointly improve the treatment quality of the kapok blended yarn.

[0030] Polycarboxylic acids mainly act as crosslinking agents in textile treatment. Through multiple carboxyl groups in their molecules, they undergo esterification crosslinking reactions with cellulose fibers, thereby reducing the problem of broken yarns during weaving. The reaction principle is roughly as follows: polycarboxylic acids dehydrate at high temperatures to form anhydride intermediates, and then under the action of a catalyst, the anhydride reacts with the hydroxyl groups on the cellulose fibers to form a stable crosslinked structure, reducing the probability of single fiber slippage. The crosslinking between each other forms a fiber barrier network. This can not only improve the weaving efficiency, reduce fiber loss, but also improve the wrinkle resistance of the fabric and enhance its dimensional stability.

[0031] An aqueous solution of N-methylmorpholine-N-oxide (NMMO), as an efficient cellulose treatment agent, its core function is to break the hydrogen bond structure between cellulose molecules, release the originally bound active groups, and provide more reaction sites for subsequent treatment. It increases the amorphous region of cellulose and improves its moisture regain, causing the fiber to expand moderately and enhancing the flexibility of the fiber.

[0032] Steam flash explosion treatment mainly uses high-temperature and high-pressure steam to instantaneously relieve pressure on the cellulose in kapok blended yarn. Under high temperature and high pressure, part of the hemicellulose degrades, part of the lignin softens or degrades, the roughness of the fiber surface increases. When instantaneously relieving pressure, the water vapor that penetrates into the interior of the cellulose rapidly expands and breaks through the cellulose structure, generating frictional collisions between microfibrils and unit cells, reducing the fiber crystallinity, and causing swelling as well as a large number of cracks and holes. That is, through high temperature, high pressure and rapid pressure release, steam flash explosion causes physical and chemical changes in the fiber, including hemicellulose degradation, lignin softening, as well as roughening of the fiber surface and reduction of crystallinity. These changes not only promote the penetration of the solution into the fiber during subsequent treatment or dyeing, but also enhance the cohesion between fibers by increasing the roughness of the fiber surface. At the same time, the swollen fiber also increases the fine pore diameter.

[0033] Example 1

[0034] This example provides a method for preparing a fabric containing kapok fiber, including the following steps:

[0035] S1. Place the kapok blended yarn in a high-pressure vessel with a pressure of 15 MPa, inject carbon dioxide into the high-pressure vessel at a speed of 2 ml / min, and at the same time inject anhydrous ethanol and n-heptane into the high-pressure vessel at a speed of 0.5 ml / min, and the treatment time is 300 min. Among them: in the selected kapok blended yarn, by mass percentage, the kapok fiber is 50% and the cotton is 50%.

[0036] S2. Immerse and pad the kapok blended yarn treated in step S1 in a solution containing polycarboxylic acid, carry out the first-stage baking reaction, the second-stage baking reaction, wash, and dry; by mass percentage, the bath ratio of the kapok blended yarn to the solution containing polycarboxylic acid is 1:10, the solution containing polycarboxylic acid contains poly maleic acid with a concentration of 20 g / L and sodium hypophosphite with a concentration of 4 g / L, the padding is carried out twice by a padding machine for impregnation and rolling, the liquid pickup rate after padding is 60%, the temperature of the first-stage baking reaction is 50 °C, the time of the first-stage baking reaction is 1 min, the temperature of the second-stage baking reaction is 80 °C, and the time of the second-stage baking reaction is 3 min.

[0037] S3. First immerse the kapok blended yarn treated in step S2 in a cellulose treatment agent, and then carry out steam flash explosion treatment, wash, and dry; among them: by 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 N-methylmorpholine-N-oxide is 20%. The pressure of the steam flash explosion treatment is 0.5 MPa, and the time of the steam flash explosion treatment is 1 min.

[0038] S4. Using hollow cellulose as the warp yarn and the kapok blended yarn after being processed in step S3 as the weft yarn, perform weaving to obtain a fabric containing kapok fibers, and then perform a finishing process on the fabric to obtain a fabric containing kapok fibers, where: The finishing process includes singeing, enzyme desizing, scouring and bleaching, and dyeing steps, and the singeing, enzyme desizing, scouring and bleaching, and dyeing steps all adopt conventional technical means in the textile field. Specifically,

[0039] In the singeing step: Adopt a singeing method of two positives and two negatives, the speed of the singeing machine is 90 m / min, and steam fire extinguishing is adopted after singeing.

[0040] In the enzyme desizing step: The enzyme working solution used contains amylase with 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 h.

[0041] In the scouring and bleaching step: The scouring and bleaching working solution contains 6 g / L of refining agent, 5 g / L of hydrogen peroxide, 2 g / L of hydrogen peroxide stabilizer, and 1 g / L of caustic soda, the temperature of the scouring and bleaching working solution is 95 °C, and the time of the scouring and bleaching treatment is 4 h.

[0042] In the dyeing step: By mass percentage, the bath ratio of the fabric to the dyeing solution is 1:10, and the dyeing solution contains 15 g / L of anhydrous sodium sulfate and 3 g / L of soda ash.

[0043] Example 2

[0044] This example provides a method for preparing a fabric containing kapok fibers, including the following steps:

[0045] 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 speed of 4 ml / min, and at the same time inject anhydrous ethanol and n-heptane into the high-pressure container at a speed of 1.5 ml / min, and the treatment time is 300 min. Among them: In the selected kapok blended yarn, by mass percentage, kapok fibers are 50% and cotton is 50%.

[0046] S2. Immerse the kapok blended yarn treated in step S1 in a solution containing polycarboxylic acid, followed by padding, the first baking reaction, the second baking reaction, washing, and drying. By mass percentage, the bath ratio of the kapok blended yarn to the solution containing polycarboxylic acid is 1:20. The solution containing polycarboxylic acid contains 50 g / L of polymaleic acid and 12 g / L of sodium hypophosphite. The padding is carried out twice by a padding machine for impregnation and two rolling operations, and the liquor pickup rate after padding is 100%. The temperature of the first baking reaction is 85 °C, and the time of the first baking reaction is 10 min. The temperature of the second baking reaction is 100 °C, and the time of the second baking reaction is 8 min.

[0047] S3. Immerse the kapok blended yarn treated in step S2 in a cellulose treatment agent first, and then carry out steam explosion treatment, followed by washing and drying. Among them: By mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:20. The temperature of the immersion is 85 °C, and the time of the immersion is 30 min. The cellulose treatment agent is N-methylmorpholine-N-oxide, and the mass percentage of 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.

[0048] S4. Use hollow cellulose as the warp yarn and the kapok blended yarn treated in step S3 as the weft yarn for weaving to obtain a fabric containing kapok fibers, and then carry out finishing processes on the fabric to obtain a fabric containing kapok fibers. Among them: The finishing processes include singeing, enzymatic desizing, scouring and bleaching, and dyeing steps, and the singeing, enzymatic desizing, scouring and bleaching, and dyeing steps all adopt conventional technical means in the textile field. Specifically,

[0049] In the singeing step: Adopt a singeing method of two positives and two negatives, the speed of the singeing machine is 110 m / min, and steam fire extinguishing is used after singeing.

[0050] In the enzymatic desizing step: The enzymatic working solution used contains 3 g / L of amylase, the pH value of the enzymatic working solution is 5.5, the temperature of the enzymatic desizing treatment is 55 °C, and the time of the enzymatic desizing treatment is 20 h.

[0051] In the scouring and bleaching step: The scouring and bleaching working solution contains 8 g / L of scouring agent, 6 g / L of hydrogen peroxide, 3 g / L of hydrogen peroxide stabilizer, and 2 g / L of caustic soda. The temperature of the scouring and bleaching working solution is 100 °C, and the time of the scouring and bleaching treatment is 4 h.

[0052] In the dyeing step: By mass percentage, the bath ratio of the fabric to the dyeing solution is 1:10, and the dyeing solution contains 40 g / L of anhydrous sodium sulfate and 6 g / L of soda ash.

[0053] Example 3

[0054] This example provides a method for preparing a fabric containing kapok fiber, which includes the following steps:

[0055] S1. Place the kapok blended yarn in a high-pressure vessel with a pressure of 20 MPa, inject carbon dioxide into the high-pressure vessel at a speed of 3 ml / min, and at the same time inject anhydrous ethanol and n-heptane into the high-pressure vessel at a speed of 1 ml / min, with a treatment time of 300 min. Among them: in the selected kapok blended yarn, by mass percentage, the kapok fiber is 50% and the cotton is 50%.

[0056] S2. Immerse and pad the kapok blended yarn treated in step S1 in a solution containing polycarboxylic acid, conduct the first-stage baking reaction, the second-stage baking reaction, wash, and dry; by mass percentage, the bath ratio of the kapok blended yarn to the solution containing polycarboxylic acid is 1:20, the solution containing polycarboxylic acid contains poly maleic acid with a concentration of 50 g / L and sodium hypophosphite with a concentration of 5 g / L, the immersion and padding are carried out twice by an impregnating and padding machine, the liquid holding rate after immersion and padding is 80%, the temperature of the first-stage baking reaction is 80 °C, the time of the first-stage baking reaction is 3 min, the temperature of the second-stage baking reaction is 90 °C, and the time of the second-stage baking reaction is 4 min.

[0057] S3. First soak the kapok blended yarn treated in step S2 in a cellulose treatment agent, then conduct steam explosion treatment, wash, and dry; among them: by 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-methyl morpholine-N-oxide, and the mass percentage of N-methyl morpholine-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.

[0058] S4. Use hollow cellulose as the warp yarn and the kapok blended yarn treated in step S3 as the weft yarn for weaving to obtain a fabric containing kapok fiber, and then perform a finishing process on the fabric to obtain a fabric containing kapok fiber, where: the finishing process includes singeing, enzyme desizing, scouring and bleaching, and dyeing steps, and the singeing, enzyme desizing, scouring and bleaching, and dyeing steps all adopt conventional technical means in the textile field. Specifically,

[0059] In the singeing step: adopt a singeing method of two positives and two negatives, the vehicle speed of the singeing machine is 100 m / min, and steam extinguishing is used after singeing.

[0060] In the enzymatic desizing step: The enzymatic working solution used contains amylase at a concentration of 2 g / L, the pH value of the enzymatic working solution is 5.5, the temperature for enzymatic desizing treatment is 55 °C, and the time for enzymatic desizing treatment is 18 h.

[0061] In the scouring and bleaching step: The scouring and bleaching working solution contains 7 g / L of scouring agent, 5.5 g / L of hydrogen peroxide, 2.5 g / L of hydrogen peroxide stabilizer, and 1.5 g / L of caustic soda. The temperature of the scouring and bleaching working solution is 100 °C, and the time for scouring and bleaching treatment is 4 h.

[0062] In the dyeing step: By mass percentage, the bath ratio of the fabric to the dyeing solution is 1:10. The dyeing solution contains 25 g / L of anhydrous sodium sulfate and 5 g / L of sodium carbonate.

[0063] Comparative Example 1

[0064] The difference between this comparative example and Example 3 is that the treatment in step S1 is not carried out.

[0065] Comparative Example 2

[0066] The difference between this comparative example and Example 3 is that the treatment in step S2 is not carried out.

[0067] Comparative Example 3

[0068] The difference between this comparative example and Example 3 is that the treatment in step S3 is not carried out.

[0069] Comparative Example 4

[0070] The difference between this comparative example and Example 3 is that the treatments in steps S1 - S3 are not carried out.

[0071] The weaving efficiency, deodorizing, and heat - retaining properties of Examples 1 - 3 and Comparative Examples 1 - 4 were tested. The test methods are as follows:

[0072] (1) Weaving efficiency:

[0073] After the yarn is woven on the loom, the loom automatically counts the running efficiency.

[0074] (2) Deodorizing:

[0075] Refer to GB / T 33610.1 - 2019 "Textiles - Determination of deodorizing performance - Part 1: General principles" to determine the concentration reduction rate.

[0076] (3) Heat - retaining:

[0077] Refer to GB / T 35762 - 2017 "Textiles - Test method for heat transfer properties - Plate method" for determination.

[0078] The test results are shown in Table 1.

[0079] Table 1:

[0080]

[0081] From the data comparison in Table 1, it can be seen that after the kapok blended yarn is successively treated with a supercritical carbon dioxide system, soaked in a solution containing polycarboxylic acid, soaked in a cellulose treatment agent, and steam exploded, while maintaining the excellent antibacterial effect of the kapok blended yarn, the weaving efficiency and thermal insulation performance of the kapok blended yarn are improved.

[0082] In summary, by treating the kapok blended yarn with a supercritical carbon dioxide solvent system, the hydrophobic substances such as wax and pectin on the surface of the kapok blended yarn are reduced, the accessibility of its aqueous solution is increased, and the subsequent treatment effect and dyeing effect are improved.

[0083] The soaking treatment with polycarboxylic acid can increase the connection between fibers, reduce the slippage of the kapok blended yarn during weaving or use, reduce the loss of kapok during weaving or use, improve the weaving efficiency, help save costs, and a high content of kapok fibers in the fabric helps to retain static air. Although the cross-linking treatment of polycarboxylic acid on cellulose fibers reduces the deodorizing effect of the fabric, it increases the thermal insulation effect.

[0084] The crystallinity of kapok fibers is 33%, lower than 54% of cotton fibers, and the fiber has many pores. Compared with cotton, it is more effective to treat the kapok blended yarn containing kapok fibers with a cellulose treatment agent, which can increase the active groups and the amorphous region of the kapok blended yarn. The steam explosion treatment increases the roughness of the fiber surface, increases the fiber diameter and surface roughness in the kapok blended yarn, thereby enhancing the bonding force between fibers and reducing fiber loss. At the same time, the steam explosion treatment can generate a large number of micropores, enhancing the ability of the kapok blended yarn to adsorb odors.

[0085] Although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0086] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of this application, and they are not used to limit the protection scope of this application. Any equivalent embodiments or changes made without departing from the technical spirit of this application should be included in the protection scope of this application.

Claims

1. A preparation method of a fabric containing kapok fiber, characterized in that, It includes the following steps: S1. Place the kapok blended yarn in a supercritical carbon dioxide system for treatment; S2. Immerse and pad the kapok blended yarn treated in step S1 in a solution containing polycarboxylic acid, carry out the first-stage baking reaction, the second-stage baking reaction, wash, and dry; S3. First soak the kapok blended yarn treated in step S2 in a cellulose treatment agent, then carry out steam explosion treatment, wash, and dry, and the cellulose treatment agent is N-methylmorpholine-N-oxide; S4. Use hollow cellulose as the warp yarn and the kapok blended yarn treated in step S3 as the weft yarn for weaving to obtain a fabric containing kapok fibers, and then carry out a finishing process on the fabric to obtain a fabric containing kapok fibers.

2. The preparation method of the 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 under 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 preparation method of the fabric containing kapok fiber according to claim 2, characterized in that, It also includes the step of injecting a co-solvent into the container simultaneously, and the injection rate of the co-solvent is 0.5-1.5 ml / min.

4. The preparation method of 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 preparation method of the fabric containing kapok fiber according to claim 1, characterized in that, In step S2, by 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 liquid pickup rate after padding is 60%-100%. The temperature of the first-stage baking reaction is 50-85 °C, and 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.

6. The preparation method of 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 preparation method of the fabric containing kapok fiber according to claim 1, characterized in that, In step S3, by mass percentage, the bath ratio of the kapok blended yarn to the cellulose treatment agent is 1:10-1:

20. The temperature of the soaking is 20 °C-85 °C, and the time of the soaking is 5-30 min.

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

9. The preparation method of the 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-5 MPa, and the time of the steam explosion treatment is 1-10 min.

10. The preparation method of the fabric containing kapok fiber according to claim 1, characterized in that, In step S1, the kapok blended yarn is blended by kapok fibers and at least one of cotton, wool, and acrylic.

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