Cool fabric and preparation method thereof

Abstract

The invention discloses a cool fabric and a preparation method thereof, and belongs to the technical field of fabrics, the key point of the technical scheme is that the cool fabric comprises cotton fibers and cool spinning fibers adsorbed on the cotton fibers under negative pressure, the cool spinning fibers are mainly composed of mica powder and acrylic fibers, and the preparation method of the cool fabric is characterized in that the cool spinning fibers are prepared from the mica powder and the acrylic fibers. Comprising the following preparation steps: S1, carrying out electrostatic spinning on a cool spinning solution, and stretching to form superfine fibers; s2, adsorbing the superfine fibers on the surfaces of the cotton fibers in a negative pressure adsorption manner to form nano inlaid spinning card slivers; s3, the nanometer inlaid spinning card slivers are sequentially subjected to blowing, cotton carding, drawing, roving and spinning procedures to form cool-feeling yarns, spinning liquid containing cool-feeling components is adsorbed to common cotton fibers through negative pressure, the nanometer inlaid spinning card slivers are formed, the cool-feeling effect of the fabric is guaranteed, and meanwhile it is guaranteed that the fabric has good air permeability.

Description

Technical Field

[0001] The present application relates to the technical field of fabrics, and particularly to a cool - feeling fabric and a preparation method thereof. Background Art

[0002] A cool - feeling fabric is a fabric with a cool feeling woven by a unique process design. When it comes into direct contact with the human skin, it can quickly absorb and conduct the sweat on the skin surface, and can rapidly dissipate the heat generated by the human body in a hot environment, so as to keep the skin surface dry. There is a cool feeling at the moment of contact, and it can maintain cool comfort for a long time, playing a role in regulating the microclimate on the human skin surface.

[0003] At present, the common cool - feeling fabrics on the market mostly use chemical synthetic fibers or blended materials to achieve the cool - feeling effect. Although these fabrics can improve the comfort to a certain extent, they perform poorly in terms of breathability and skin - friendliness; there are also natural mineral fibers such as mica and bamboo charcoal incorporated into the fabric to enhance the thermal conductivity and moisture absorption of the fabric. Although it is more environmentally friendly and friendly to the human body, the processing difficulty is large, the cost is high, and the cool - feeling effect is not as obvious as that of chemical synthetic fibers; to solve the cool - feeling problem of the fabric, micro - capsules are also coated on the fiber surface. When the human body sweats, the micro - capsules release a coolant, thus generating a cool feeling. Its advantage is that the cool - feeling intensity can be accurately regulated, and the disadvantage is that the cost of the micro - capsules is high, and they are easy to fall off after long - term use, affecting the service life. Therefore, the existing preparation methods of cool - feeling fabrics generally have high costs, unstable cool - feeling effects, are difficult to balance comfort, and cannot meet the market demand. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present application provides a cool - feeling fabric and a preparation method thereof. By negatively adsorbing a spinning solution containing a cool - feeling component on ordinary cotton fibers to form a nano - inlaid roving, the cool - feeling effect of the fabric is ensured, and at the same time, the fabric has good breathability.

[0005] The first aspect of the present application is to provide a cool - feeling fabric, adopting the following technical solution: A cool - feeling fabric includes cotton fibers and cool - feeling spun fibers negatively adsorbed on the cotton fibers. The raw materials of the cool - feeling spun fibers mainly consist of mica powder and acrylic fibers.

[0006] By adopting the above - mentioned technical solution, when the cool - feeling fabric of the present application is composed of cotton fibers and cool - feeling spun fibers, it will neither damage the breathable and skin - friendly properties of the cotton fibers, and at the same time, the addition of the cool - feeling spun fibers can ensure the cool - feeling effect of the yarn. The textile fabric prepared with this yarn takes into account both the breathability and the cool - feeling effect. In addition, after the cool - feeling spun fibers are negatively adsorbed on the cotton fibers, it can also ensure the lasting performance of the cool - feeling of the textile fabric made from this yarn, and ensure the service life of the cool - feeling function of the textile.

[0007] The second aspect of the present application is to provide a preparation method of a cool-sensation fabric, including the following preparation steps: S1. Electrospinning the cool-sensation spinning solution and then stretching it to form ultrafine fibers; S2. Adsorbing the ultrafine fibers on the surface of cotton fibers by means of negative pressure adsorption to form a nano-inlaid spinning sliver; S3. Passing the nano-inlaid spinning sliver through the processes of blowing-carding, carding, drawing, roving, and spinning in sequence to form a cool-sensation yarn, and then knitting to obtain the cool-sensation fabric.

[0008] By adopting the above technical solution, after the ultrafine fibers obtained by stretching electrospinning are directly adsorbed on cotton fibers by means of negative pressure adsorption in the present application, the production process is simplified, the energy consumption is reduced, the overall production efficiency is improved, and the nano-inlaid spinning sliver formed by the adsorption of the ultrafine fibers and cotton fibers enhances the overall performance of the fabric.

[0009] In a preferred embodiment, the cool-sensation spinning solution is obtained by the following preparation method: (1) Dissolving 8.5-9.5 parts by weight of acrylic fiber in dimethylformamide to form a solution with a concentration of 10-15 wt%; (2) Adding 1-1.5 parts by weight of mica powder and 0.02-0.09 parts by weight of a dispersant to step (1), ultrasonically dispersing for 50-60 min, and then performing vacuum degassing to obtain the cool-sensation spinning solution.

[0010] In a preferred embodiment, the dispersant is composed of polyvinylpyrrolidone and BYK-168 in a weight ratio of 1:(0.8-1.2).

[0011] By adopting the above technical solution, the mica powder and the dispersant are ultrasonically dispersed in the acrylic fiber solution, effectively ensuring the strength of the ultrafine fibers and avoiding breakage during the stretching process. Moreover, the combined use of the two dispersants can effectively improve the dispersion effect of the mica powder in the acrylic fiber solution. The reason may be that the long-chain molecules of polyvinylpyrrolidone are adsorbed on the surface of the mica powder, preventing the agglomeration between mica powder particles through a physical barrier method. Moreover, the polar amide groups of polyvinylpyrrolidone form hydrogen bonds with the hydroxyl groups on the mica surface, enhancing the compatibility between the mica powder and the acrylic fiber. The hydrophobic chain segments of BYK-168 are anchored on the surface of the mica powder. Therefore, the combined use of the two dispersants forms a multi-layer protection barrier on the surface of the mica powder, avoiding the agglomeration between the mica powders, effectively improving the dispersion effect of the mica powder in the acrylic fiber, and thus ensuring the mechanical properties of the ultrafine fibers.

[0012] In a preferred embodiment, during the electrospinning in step S1, the diameter of the nozzle is 5-10 μm. After spinning, it is stretched at 120-130 °C to obtain ultrafine fibers with a diameter of 1-3 μm.

[0013] By adopting the above technical solution, when the fibers after electrospinning are stretched under the condition of 120-130 °C, it promotes the molecular chains of acrylic fibers to arrange along a specific direction under the action of external force to coat the mica particles, avoiding a large amount of mica powder particles falling off after long-term use, so that the cool feeling performance of the ultrafine fibers is more durable.

[0014] In a preferred embodiment, in the initial stage of the negative pressure adsorption in step S2, the negative pressure is 20-25 kPa, the adsorption time is 40-50 s, and the air flow rate is 0.5-1 m / min. In the final stage, the negative pressure is 35-40 kPa, the adsorption time is 20-30 s, and the air flow rate is 3 m / min.

[0015] By adopting the above technical solution, when the present application adopts two-stage negative pressure adsorption operation, in the initial stage, the ultrafine fibers can be evenly dispersed on the cotton fibers. After increasing the negative pressure intensity in the final stage, the embedding depth of the ultrafine fibers in the cotton fibers can be increased, making the bonding strength between the ultrafine fibers and the cotton fibers higher and avoiding separation during subsequent operations.

[0016] In a preferred embodiment, the environmental humidity during the negative pressure adsorption is 60-70%.

[0017] By adopting the above technical solution, when the environmental humidity is 60-70%, the cotton fibers have a certain degree of swelling when absorbing moisture, making it easier to capture the ultrafine fibers. However, when the environmental humidity is too high, the ultrafine fibers are prone to agglomeration on the cotton fibers, which instead affects the uniform dispersion of the ultrafine fibers on the cotton fibers.

[0018] In a preferred embodiment, the diameter of the ultrafine fibers during the negative pressure adsorption is ≤ 1 / 5 of the diameter of the cotton fibers.

[0019] By adopting the above technical solution, when the diameter of the ultrafine fibers is ≤ 1 / 5 of the diameter of the cotton fibers, the ultrafine fibers can be more easily attached to the cotton fibers. Otherwise, the ultrafine fibers are prone to falling off from the cotton fibers. At the same time, after further defining the diameters of the ultrafine fibers and the cotton fibers, the skin-friendly moisture-permeable performance of the cotton fibers can also be ensured.

[0020] In a preferred embodiment, during the negative pressure adsorption, the surrounding temperature is controlled at 25-30 °C through a water-cooled pipe.

[0021] By adopting the above technical solution, since the ultrafine fibers are obtained under the stretching condition of 120-150°C, in order to avoid the problem of softening of the ultrafine fibers due to friction or too high environmental temperature during subsequent operations, when the environmental temperature is controlled within the range of 25-30°C, it can not only ensure the problem of heat shrinkage of the ultrafine fibers, but also enable the ultrafine fibers to be stably fixed on the cotton fibers and enhance the bonding strength.

[0022] In summary, the present application has the following beneficial effects: The present application obtains cool-sensation spun ultrafine fibers by electrospinning and then fixes them on cotton fibers by negative pressure adsorption, which not only ensures the skin-friendly and breathable performance of the cotton fibers, but also improves the cool-sensation effect of the cotton fibers. Moreover, through the optimized design of the diameter of the ultrafine fibers, the diameter of the cotton fibers and various process parameters, the adhesion effect of the ultrafine fibers on the cotton fibers is improved, thereby enhancing the long-lasting cool-sensation effect of the cool-sensation fabric. Specific embodiments

[0023] The following further details the present application with reference to embodiments. All reagents without indicating the manufacturer are conventional reagent products that can be obtained through commercial purchase.

[0024] Example 1 A preparation method of a cool-sensation fabric includes the following preparation steps: S1. Preparation of the cool-sensation spinning solution S1.1. Dissolve 8.5 kg of acrylic fiber in dimethylformamide to form a solution with a concentration of 10 wt%. S1.2. Add 1 kg of mica powder and 0.02 kg of dispersant to step S1.1, then ultrasonically disperse for 50 min, and then vacuum degas to obtain the cool-sensation spinning solution, where the dispersant is composed of polyvinylpyrrolidone and BYK-168 with a weight ratio of 1:0.8. S2. Electrospin the cool-sensation spinning solution obtained in step S1 and stretch it at 120°C to form ultrafine fibers with a diameter of 1 μm, where the nozzle diameter during electrospinning is 5 μm. S3. Select cotton fibers with a diameter of 5 μm, and adsorb the ultrafine fibers obtained in step S2 on the surface of the cotton fibers by negative pressure adsorption to form a nano-inlaid spun sliver. Specifically, adsorb for 40 s under the conditions of a negative pressure of 20 kPa and an air flow rate of 0.5 m / min, and then adsorb for 20 s under the conditions of a negative pressure of 35 kPa and an air flow rate of 3 m / min. The environmental humidity during negative pressure adsorption is controlled within the range of 60-70%, and the surrounding environmental temperature during negative pressure adsorption is controlled between 25-30°C through a water-cooling pipe. S4. Pass the nano-inlaid spun sliver through the processes of opening, carding, drawing, roving, and spinning to form cool-sensation yarns, and then knit the cool-sensation yarns to obtain the cool-sensation fabric.

[0025] Example 2 A preparation method of a cool feeling fabric, comprising the following preparation steps: S1. Prepare the cool feeling spinning solution S1.1. Dissolve 9.5 kg of acrylic fiber in dimethylformamide to form a solution with a concentration of 15 wt%; S1.2. Add 1.5 kg of mica powder and 0.09 kg of dispersant to step S1.1, ultrasonically disperse for 60 min, and then perform vacuum degassing to obtain the cool feeling spinning solution, where the dispersant is composed of polyvinylpyrrolidone and BYK-168 with a weight ratio of 1:0.8; S2. Electrospin the cool feeling spinning solution obtained in step S1 and stretch it at 120 °C to form ultrafine fibers with a diameter of 1 μm, where the nozzle diameter during electrospinning is 5 μm; S3. Select cotton fibers with a diameter of 6 μm, and adsorb the ultrafine fibers obtained in step S2 on the surface of the cotton fibers by negative pressure adsorption to form a nano-embedded spinning sliver. Specifically, adsorb for 40 s under the conditions of a negative pressure of 20 kPa and an air flow rate of 0.5 m / min, and then adsorb for 20 s under the conditions of a negative pressure of 35 kPa and an air flow rate of 3 m / min. The environmental humidity during negative pressure adsorption is 60-70%, and the surrounding environmental temperature during negative pressure adsorption is controlled between 25-30 °C through a water-cooled pipe; S4. Pass the nano-embedded spinning sliver through the processes of blowing, carding, drawing, roving, and spinning to form a cool feeling yarn, and then knit the cool feeling yarn to obtain the cool feeling fabric.

[0026] Example 3 A preparation method of a cool feeling fabric, comprising the following preparation steps: S1. Prepare the cool feeling spinning solution S1.1. Dissolve 8.5 kg of acrylic fiber in dimethylformamide to form a solution with a concentration of 10 wt%; S1.2. Add 1 kg of mica powder and 0.02 kg of dispersant to step S1.1, ultrasonically disperse for 50 min, and then perform vacuum degassing to obtain the cool feeling spinning solution, where the dispersant is composed of polyvinylpyrrolidone and BYK-168 with a weight ratio of 1:1.2; S2. Electrospin the cool feeling spinning solution obtained in step S1 and stretch it at 130 °C to form ultrafine fibers with a diameter of 3 μm, where the nozzle diameter during electrospinning is 10 μm; S3. Select cotton fibers with a diameter of 16 μm, and adsorb the ultrafine fibers obtained in step S2 on the surface of the cotton fibers by means of negative pressure adsorption to form a nano-embedded spun sliver. Specifically, after adsorbing for 50 s under the conditions of a negative pressure of 25 kPa and an air flow rate of 1 m / min, adsorb for 30 s under the conditions of a negative pressure of 40 kPa and an air flow rate of 3 m / min. The environmental humidity during negative pressure adsorption is controlled within the range of 60 - 70%, and the ambient temperature during negative pressure adsorption is controlled between 25 - 30 °C through a water-cooled pipe; S4. Pass the nano-embedded spun sliver through the processes of blowing, carding, drawing, roving, and spinning in sequence to form a cool-sensation yarn, and then knit the cool-sensation yarn to obtain a cool-sensation fabric.

[0027] Example 4 A preparation method of a cool-sensation fabric, which is different from Example 1 in that only polyvinylpyrrolidone is used as the dispersant in step S1.1, and the others are the same as in Example 1.

[0028] Example 5 A preparation method of a cool-sensation fabric, which is different from Example 1 in that only BYK-168 is used as the dispersant in step S1.1, and the others are the same as in Example 1.

[0029] Example 6 A preparation method of a cool-sensation fabric, which is different from Example 1 in that only one pressure adsorption is used for the negative pressure adsorption in step S3. Specifically, after adsorbing for 50 s under the conditions of a negative pressure of 20 kPa and an air flow rate of 0.5 m / min, a nano-embedded spun sliver is obtained, and the others are the same as in Example 1.

[0030] Example 7 A preparation method of a cool-sensation fabric, which is different from Example 1 in that only one pressure adsorption is used for the negative pressure adsorption in step S3. Specifically, after adsorbing for 20 s under the conditions of a negative pressure of 35 kPa and an air flow rate of 3 m / min, a nano-embedded spun sliver is obtained, and the others are the same as in Example 1.

[0031] Example 8 A preparation method of a cool-sensation fabric, which is different from Example 1 in that the diameter of the cotton fibers is 4 μm, and the others are the same as in Example 1.

[0032] Performance detection Perform cool-sensation performance, hygroscopicity, air permeability, and washability performance tests on the cool-sensation fabrics obtained in the above examples. The test results are shown in Table 1.

[0033] Among them, the detection of the air permeability of the fabric is based on GB / T5453-1997 "Determination of Air Permeability of Textiles Fabrics". An automatic air permeability tester is used to test the air permeability of the fabric. The air permeability test result is measured by the air permeability rate. The larger the air permeability rate, the better the air permeability. The test pressure difference set during the test process is 100Pa, and the test area is 20cm 2 , and 10 different parts are selected from each sample for the air permeability test, and then the average value is taken.

[0034] The detection of the moisture permeability of the fabric is based on GB / T12704.1-2009 "Textiles Test Method for Moisture Permeability of Fabrics Part 1: Moisture Absorption Method". A fabric moisture permeability tester is used to test the moisture permeability of the fabric. The test result is measured by the moisture permeability rate. During the measurement, the fabric is cut into circular specimens with a diameter of about 7cm, and the skin-facing side is placed face down on the moisture permeability cup. Without adding a cup lid, it is placed in a test chamber with a temperature of 38±2°C and a relative humidity of 90±2%. After 60 minutes, take it out, put on the lid, and quickly put it into a drying oven for 30 minutes. Then, without covering the lid, place it on an electronic balance with an accuracy of 0.001g for the first weighing. Repeat the above operation steps for the second weighing, and then calculate the moisture permeability rate through the formula. The moisture permeability rate = 24×Δm / S×t, where Δm is the difference in weight before and after weighing, the unit is g, S is the specimen area, and t is the test time.

[0035] The cool feeling test is based on GB / T35263-2017 "Detection and Evaluation of the Instant Cool Feeling Performance of Textiles in Contact". A fabric cool feeling performance tester is used to test the contact cool feeling of the fabric specimen. The contact cool feeling test result is measured by the contact cool feeling coefficient. The larger the measured contact cool feeling coefficient, the stronger the cool feeling degree of the fabric specimen felt by the skin.

[0036] The cool feeling persistence is to test the loss rate of the cool feeling coefficient by the same method after washing the fabric 100 times.

[0037] Table 1 Test Results of the Performance of Each Fabric The control example is a fabric prepared from 100% cotton fiber.

[0038] It can be seen from the above table that: The fabrics obtained in Examples 1-3 of this application all have good moisture permeability and air permeability. In addition, the fabric also has a good cool feeling effect. After 100 washes, the cool feeling loss rate ≤ 1.2%, indicating that the mica powder in this application has a good dispersion effect in acrylic fiber. After electrospinning, the adhesion between it and acrylic fiber is strong, effectively reducing the shedding of mica powder. And after the negative pressure operation, the ultrafine fibers have a good embedding depth in the cotton fiber, thus ensuring the bonding effect between the ultrafine fibers and the cotton fiber and reducing the cool feeling loss rate of the fabric.

[0039] Compared with Example 1, in Examples 4 - 5, when only polyvinylpyrrolidone or BYK - 168 is used as the dispersant in the cool - feeling spinning solution, the moisture permeability and air permeability of the fabric obtained in Examples 4 - 5 are the same as those in Example 1. However, the cool - feeling coefficient is significantly lower than that in Example 1, and the cool - feeling loss rate is much higher than that in Example 1. The reason may be that when only polyvinylpyrrolidone or BYK - 168 is used as the dispersant, its action form on mica powder is single and fails to achieve a good dispersion effect. Therefore, when the two dispersants are used in combination, the dispersion effect of mica powder in acrylic fiber can be effectively improved, thereby effectively ensuring the cool - feeling effect and cool - feeling persistence of the fabric.

[0040] Compared with Example 1, in Example 6, when only low negative pressure is used for negative - pressure adsorption, the moisture - permeability and air - permeability of the fabric obtained in Example 6 are basically the same as those in Example 1. The cool - feeling coefficient is lower than that in Example 1, but the wash - resistance performance is significantly reduced. The reason may be that when low negative pressure is used for adsorption, the adhesion between ultrafine fibers and cotton fibers is not strong. However, when low negative pressure is used for adsorption, the ultrafine fibers are evenly dispersed on the cotton fibers, so it has little impact on the moisture - permeability and air - permeability of the fabric. However, due to the weak adhesion between ultrafine fibers and cotton fibers, the cool - feeling persistence will be reduced.

[0041] Compared with Example 1, in Example 7, when only high negative pressure is used for negative - pressure adsorption, the distribution of ultrafine fibers on cotton fibers is uneven. And due to the too high initial negative pressure, the ultrafine fibers are embedded in the pores of cotton fibers before being evenly dispersed, compressing the pores of cotton fibers, thus affecting the air - permeability and moisture - permeability of the fabric. Moreover, the cool - feeling loss rate of the fabric is also significantly higher than that in Example 1, indicating that the cool - feeling persistence of the fabric is reduced.

[0042] Compared with Example 1, in Example 8, when the diameter ratio of ultrafine fibers to cotton fibers is greater than one - fifth, it is equivalent to an excessive proportion of ultrafine fibers, which will affect the pores of cotton fibers and lead to a reduction in the moisture - permeability and air - permeability of the fabric. However, the cool - feeling performance is basically the same as that in Example 1. Thus, it can be seen that after further limiting the diameters of ultrafine fibers and cotton fibers, the moisture - permeability, air - permeability and cool - feeling performance of the fabric can be effectively balanced.

[0043] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.

Claims

1. A cool-sensation fabric, characterized in that: It includes cotton fibers and cool-sensation spinning fibers adsorbed on the cotton fibers by negative pressure. The raw materials of the cool-sensation spinning fibers are mainly composed of mica powder and acrylic fibers.

2. A preparation method of the cool feeling fabric as described in claim 1, characterized in that: It includes the following preparation steps: S1. Electrospinning the cool-sensation spinning solution and then stretching it to form ultrafine fibers; S2. Adsorbing the ultrafine fibers on the surface of cotton fibers by negative pressure to form a nano-embedded spinning sliver; S3. Passing the nano-embedded spinning sliver through the processes of blowing-carding, carding, drawing, roving, and spinning in sequence to form a cool-sensation yarn, and then knitting to obtain a cool-sensation fabric.

3. The preparation method of a cool-sensation fabric according to claim 2, wherein: The cool-sensation spinning solution is obtained by the following preparation method: (1) Dissolve 8.5-9.5 parts by weight of acrylic fibers in dimethylformamide to form a solution with a concentration of 10-15 wt%; (2) Add 1-1.5 parts by weight of mica powder and 0.02-0.09 parts by weight of a dispersant to step (1), then perform ultrasonic dispersion for 50-60 min, and then perform vacuum degassing to obtain the cool-sensation spinning solution.

4. The preparation method of a cool feeling fabric according to claim 3, characterized in that: The dispersant is composed of polyvinylpyrrolidone and BYK-168 in a weight ratio of 1:(0.8-1.2).

5. The preparation method of a cool-sensation fabric according to claim 2, characterized in that: In step S1, when electrospinning, the nozzle diameter is 5-10 μm, and after spinning, it is stretched at 120-130 °C to obtain ultrafine fibers with a diameter of 1-3 μm.

6. The preparation method of a cool feeling fabric according to claim 2, characterized in that: In the initial stage of negative pressure adsorption in step S2, the negative pressure is 20-25 kPa, the adsorption time is 40-50 s, the air flow rate is 0.5-1 m / min, in the final stage, the negative pressure is 35-40 kPa, the adsorption time is 20-30 s, and the air flow rate is 3 m / min.

7. The preparation method of a cool feeling fabric according to claim 2, characterized in that: The environmental humidity during negative pressure adsorption is 60-70%.

8. The preparation method of a cool-sensation fabric according to claim 2, characterized in that: During negative pressure adsorption, the diameter of the ultrafine fibers ≤ 1 / 5 of the diameter of the cotton fibers.

9. The preparation method of a cool-sensation fabric according to claim 2, characterized in that: During negative pressure adsorption, the surrounding temperature is controlled at 25-30 °C through a water-cooled pipe.

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