Method for producing a mite-proof inlaid spun yarn

Abstract

The present application relates to a kind of preparation methods of anti-mite mosaic spinning yarn, the particle size of traditional microcapsule is micron level, sub-micron fiber is difficult to completely cover it, by adjusting various process parameters, the effective control of microcapsule particle size is realized, a kind of anti-mite microcapsule with particle size of nanometer scale 200-700nm is prepared, sub-micron fiber wrapped anti-mite microcapsule is obtained by electrostatic forming technology, to prevent anti-mite microcapsule from falling off.Subsequently, it is used in mosaic spinning and is combined with cotton fiber.The anti-mite microcapsule prepared in the present application is regulated and controlled, so that it is suitable for mosaic spinning, and comfortable durable anti-mite effect lasting cotton yarn is obtained.

Description

Technical Field

[0001] This invention belongs to the field of textile manufacturing, and specifically relates to a method for preparing mite-proof inlaid yarn. Background Technology

[0002] Dust mite secretions, feces, and dead mites are among the most significant allergens causing allergic diseases. Of all the types of mites, the most numerous and widely distributed is the house dust mite. House dust mites thrive in warm, humid environments, and their dead bodies, feces, and other excrement harm human skin health and can easily trigger diseases such as asthma, allergic rhinitis, and dermatitis. In the home environment, upholstered furniture, bedding, and other household textiles are loose and porous, and often contain residual human skin flakes. This provides suitable living conditions for house dust mites, making them a primary vector for disease transmission. Therefore, the development of mite-proof home textiles is of great significance.

[0003] Microcapsules can store functional substances, allowing anti-mite agents to be stored internally and released when needed. Currently, most anti-mite textiles use impregnation or spraying finishing agents to attach microcapsules to cotton yarn or fabric. However, these microcapsules are prone to detachment or breakage, leading to a sudden release of the anti-mite agent and failing to achieve a long-lasting effect. The development of inlaid spun anti-mite composite yarns can not only effectively prevent the growth of mites on the surface of skin-friendly home textiles and reduce the number of related allergens, but also maintain the comfort of cotton fabrics and improve the user experience. However, the anti-mite auxiliaries required for inlaid spinning have a small particle size, while traditional microcapsules have a particle size in the micrometer range. The particle size of microcapsules prepared using traditional methods does not match the fiber fineness.

[0004] Patent CN103147409B discloses an antibacterial and anti-mite microcapsule and its preparation method. The antibacterial and anti-mite microcapsule is prepared by using polymethyl methacrylate with added silver ions as the wall material and antibacterial and anti-mite liquid as the core material. The process is relatively complex and the cost is high.

[0005] Patent CN110205827B discloses a method for manufacturing a natural antibacterial, anti-mite, and odor-eliminating red pine microcapsule mattress. The antibacterial and anti-mite mattress is obtained by spraying a microcapsule finishing agent. However, the mattress has poor water resistance and the functional finishing agent sprayed on the fabric surface will affect the comfort during use.

[0006] Patent CN111270327A discloses a mosquito-repellent and mite-repellent functional fiber and its preparation method. The mosquito-repellent and mite-repellent fiber is prepared by preparing mosquito-repellent and mite-repellent microcapsules and blending them with other components to obtain the fiber. The average particle size of the microcapsules is 10μm. After the blending and spinning is completed, some microcapsules will be exposed on the fiber surface, which will affect the durability. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a method for preparing highly efficient and durable anti-mite inlaid spun yarn. This invention prepares a nanoscale microcapsule with adjustable particle size specifically for inlaid spinning to achieve highly efficient and durable anti-mite effect on the fabric. This invention prepares anti-mite microcapsules and controls the particle size to make them suitable for inlaid spinning, resulting in comfortable, durable cotton yarn with a long-lasting anti-mite effect.

[0008] The present invention provides a method for preparing an anti-mite inlaid yarn, comprising:

[0009] (1) Prepare anti-mite microcapsules, wherein the core material of the anti-mite microcapsules contains an oily anti-mite agent and the wall material is calcium alginate;

[0010] (2) Mix the polymer, solvent and anti-mite microcapsules to obtain a spinning solution. According to the spinning quality requirements, cotton is blended, carded, drawn and spun. In the carding stage, an electrospinning device is installed between the cotton stripping and sliver forming device to perform electrospinning, so as to complete the embedding of anti-mite submicron fibers carrying microcapsules in the cotton web and obtain anti-mite embedded yarn.

[0011] The preferred embodiment of the above preparation method is as follows:

[0012] The microcapsule wall material is made of calcium alginate, which has a cross-linked network structure, good chemical stability and encapsulation efficiency. When made into anti-mite microcapsules, it can form a sustained-release system, prolong the action time, and also help the submicron fibers to load the anti-mite agent.

[0013] The preparation method of the microcapsule wall material is one of the following: sharp-hole coagulation bath method, spray drying method, complex coagulation method, interfacial polymerization method, and in-situ polymerization method.

[0014] Preferably, the calcium alginate wall material of the anti-mite microcapsules is prepared from sodium alginate and calcium chloride via a sharp-pore coagulation bath method. The principle of microcapsule formation is as follows: calcium ions in the calcium chloride solution are used as cross-linking agents, and a cross-linking network is formed between the sodium alginate molecular chains using the principle of ionic cross-linking reaction, causing a structural transformation to achieve encapsulation of the anti-mite agent in the core material.

[0015] More preferably, the preparation method of the anti-mite microcapsules in step (1) includes: adding an emulsifier, a co-emulsifier and an aqueous sodium alginate solution to an oily anti-mite agent for pre-emulsification to obtain a pre-emulsion, and then performing ice bath emulsification to obtain an emulsion; adding the emulsion dropwise to a crosslinking agent stirred in a water bath for reaction to obtain an anti-mite microcapsule suspension, and then stirring to solidify, centrifuging and washing, and freeze-drying to obtain anti-mite microcapsules.

[0016] The oily anti-mite agent is one or more of the following: natural plant essential oils (such as clove essential oil, lavender essential oil, eucalyptus oil, cypress oil, citrus essential oil), eugenol (such as methyl eugenol, isoeugenol), and aromatic carboxylic acid esters (such as benzoic acid methyl ester, methyl phenylacetate, isoamyl salicylate).

[0017] The emulsifier is Tween-80; the co-emulsifier is anhydrous ethanol; the amount of oily anti-mite agent added to the emulsion is 0.4-1.4 wt%, the concentration range of sodium alginate aqueous solution is 0.02-0.1 wt%, the mass of emulsifier is 1 / 30-1 / 6 of the mass of oily anti-mite agent, and the mass ratio of co-emulsifier to emulsifier is 1:2.

[0018] The ice bath emulsification time is 5–20 min;

[0019] The crosslinking agent is a calcium chloride solution with a concentration of 0.06–0.2 wt%; the emulsion droplet acceleration rate is 0.1–0.5 mL / min; the water bath stirring rate is 600–1400 rpm; and the reaction temperature is 15–60 °C.

[0020] In step (1), the particle size of the anti-mite microcapsules is 200-700 nm.

[0021] In step (1), if the microcapsule particle size is too large, the submicron fiber coating effect will be poor, causing the microcapsules to be exposed outside the fiber, which will easily cause damage or detachment and poor durability. If the particle size is too small, the process requirements will be high and it will not be conducive to production.

[0022] In step (2), the polymer is one or more of polyacrylonitrile (PAN), polyurethane (PU), cellulose acetate (CA), polylactic acid (PLA), and polyvinyl alcohol (PVA); the solvent is one or more of N,N-dimethylformamide (DMF), acetone, acetic acid, and deionized water.

[0023] In step (2), the mass ratio of polymer to solvent is 1:6 to 1:12.

[0024] Furthermore, in step (2), the mass ratio of polymer to solvent is one of 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, or 1:12; the amount of anti-mite microcapsules added is 1 / 12 to 1 / 4 of the mass of PAN.

[0025] The electrospinning process parameters in step (2) are as follows: ambient temperature is 18-28℃, relative humidity is 35%-70%, vertical distance between the electrospinning nozzle and the cotton web is 15-30cm, and applied voltage is 40-65kV.

[0026] An anti-mite inlaid yarn prepared by the method of the present invention.

[0027] Traditional microcapsules have a particle size in the micrometer range, making it difficult for submicron fibers to completely encapsulate them. By adjusting various process parameters, the particle size of the microcapsules can be effectively controlled, resulting in the preparation of anti-mite microcapsules with a particle size in the nanometer range (200–700 nm). Submicron fibers encapsulating the anti-mite microcapsules are then obtained using electrostatic forming technology to prevent the microcapsules from falling off. Subsequently, these fibers are used in inlay spinning to composite with cotton fibers.

[0028] Beneficial effects

[0029] Microencapsulation of anti-mite agents prevents burst release and achieves long-lasting stability of the anti-mite effect. By adjusting different process parameters, the particle size of the microcapsules is effectively controlled within the nanoscale range (200-700 nm) to match the fineness of submicron fibers, achieving complete fiber encapsulation of the microcapsules. This method can be applied to inlay spinning, utilizing the difference in diameter between submicron fibers and cotton fibers to further encapsulate the anti-mite microcapsules within the cotton fibers. By preparing nanocapsules with controllable particle size and using them in inlay spinning, the final product's wash resistance, controlled release of the anti-mite agent, and durability are enhanced, resulting in better anti-mite effects, while maintaining the softness and skin-friendly comfort of the cotton fabric itself. Attached Figure Description

[0030] Figure 1 These are the morphology and diameter distribution diagrams of the microcapsules in Example 4, where (a) is the morphology diagram at a magnification of 9k; (b) is the morphology diagram at a magnification of 100k; and (c) is the diameter distribution diagram of the microcapsules.

[0031] Figure 2 The morphology of the submicron fibers loaded with microcapsules is shown in (a) and (b) respectively.

[0032] Figure 3 These are the apparent morphology images of the inlaid spun anti-mite yarn prepared in Example 4, wherein (a) is the apparent morphology image of the yarn at a magnification of 150, and (b) is the apparent morphology image of the yarn at a magnification of 700.

[0033] Figure 4 This refers to the mite-retention rate of the benzoic acid ester / calcium alginate microcapsules and inlaid spun yarn prepared in Example 4 over 21 days. Detailed Implementation

[0034] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0035] Benzyl benzoate (Beijing Innocare Technology Co., Ltd.); Tween-80 (Sinopharm Chemical Reagent Co., Ltd.); Sodium alginate (Shanghai Aladdin Biochemical Technology Co., Ltd.); Calcium chloride (Sinopharm Chemical Reagent Co., Ltd.); Polyacrylonitrile (PAN, Mw=85000, Shanghai Jinshan Petrochemical Co., Ltd.); N,N-Dimethylformamide (DMF, Sinopharm Chemical Reagent Co., Ltd.); Deionized water

[0036] Example 1

[0037] S1: Prepare a sodium alginate aqueous solution with a concentration of 0.4 mg / mL, and then stir the sodium alginate aqueous solution at room temperature for 10 h until completely dissolved. Weigh 0.6 g of benzyl benzoate, add the emulsifier Tween-80 and the co-emulsifier anhydrous ethanol, then add 100 mL of sodium alginate aqueous solution as the aqueous phase and stir for 30 min for pre-emulsification. The mass of the emulsifier is 1 / 10 of the mass of benzyl benzoate, and the mass ratio of anhydrous ethanol to Tween-80 is 1:2.

[0038] S2: Place the pre-emulsion of benzyl benzoate in a cell disruptor and emulsify it in an ice bath, adjusting the emulsification time to 10 min.

[0039] S3: Prepare a CaCl2 aqueous solution with a concentration of 1.2 mg / mL, and weigh an equal volume of CaCl2 aqueous solution to the benzyl benzoate emulsion into a beaker and stir in a water bath. Then, add the emulsified white benzyl benzoate emulsion dropwise into the CaCl2 aqueous solution at a certain rate. The reaction temperature is 45℃, the stirring rate is 1200 rpm, and the dropping rate is controlled at 0.2 mL / min to obtain an anti-mite microcapsule suspension.

[0040] S4: Stir and solidify the solution for 30 minutes. After solidification, transfer the product suspension into a centrifuge tube, set the rotation speed to 6000 rpm, wash and centrifuge 3 times, take the bottom precipitate and freeze-dry it. After 24 hours, benzyl benzoate / calcium alginate microcapsule powder with a particle size of 251 nm is obtained.

[0041] S5: Dissolve 7.2g PAN in 51.6g DMF, add 1.2g of the anti-mite microcapsules prepared in step S4, and stir the mixture evenly on a magnetic stirrer to obtain a polyelectrospinning solution. The anti-mite inlaid yarn is prepared through cotton blending, carding, drawing, roving, and ring spinning processes. In the carding process, the cotton web is used as a receiving device for electrospinning. The spinning process parameters are: ambient temperature 25℃, relative humidity 55%, and spinning voltage 45kV. The anti-mite inlaid yarn is then prepared through subsequent processes.

[0042] Example 2

[0043] S1: Prepare a sodium alginate aqueous solution with a concentration of 0.2 mg / mL, and then stir the sodium alginate aqueous solution at room temperature for 10 h until completely dissolved. Weigh 0.6 g of benzyl benzoate, add the emulsifier Tween-80 and the co-emulsifier anhydrous ethanol, then add 100 mL of sodium alginate aqueous solution as the aqueous phase and stir for 30 min for pre-emulsification. The mass of the emulsifier is 1 / 10 of the mass of benzyl benzoate, and the mass ratio of anhydrous ethanol to Tween-80 is 1:2.

[0044] S2: Place the pre-emulsion of benzyl benzoate in a cell disruptor and emulsify it in an ice bath, adjusting the emulsification time to 10 min.

[0045] S3: Prepare a 0.6 mg / mL CaCl2 aqueous solution, and weigh an equal volume of CaCl2 aqueous solution to the benzyl benzoate emulsion into a beaker and stir in a water bath. Then, add the emulsified white benzyl benzoate emulsion dropwise into the CaCl2 aqueous solution at a certain rate. The reaction temperature is 45℃, the stirring rate is 1200 rpm, and the dropping rate is controlled at 0.2 mL / min to obtain an anti-mite microcapsule suspension.

[0046] S4: Stir and solidify the solution for 30 minutes. After solidification, transfer the product suspension into a centrifuge tube, set the rotation speed to 6000 rpm, wash and centrifuge 3 times, take the bottom precipitate and freeze-dry it. After 24 hours, benzyl benzoate / calcium alginate microcapsule powder with a particle size of 385 nm is obtained.

[0047] S5: Dissolve 7.2g PAN in 51.6g DMF, add 1.2g of the anti-mite microcapsules prepared in step S4, and stir the mixture evenly on a magnetic stirrer to obtain a polyelectrospinning solution. The anti-mite inlaid yarn is prepared through cotton blending, carding, drawing, roving, and ring spinning processes. In the carding process, the cotton web is used as a receiving device for electrospinning. The spinning process parameters are: ambient temperature 25℃, relative humidity 55%, and spinning voltage 45kV. The anti-mite inlaid yarn is then prepared through subsequent processes.

[0048] Example 3

[0049] S1: Prepare a sodium alginate aqueous solution with a concentration of 0.4 mg / mL, and then stir the sodium alginate aqueous solution at room temperature for 10 h until completely dissolved. Weigh 0.6 g of benzyl benzoate, add the emulsifier Tween-80 and the co-emulsifier anhydrous ethanol, then add 100 mL of sodium alginate aqueous solution as the aqueous phase and stir for 30 min for pre-emulsification. The mass of the emulsifier is 1 / 6 of the mass of benzyl benzoate, and the mass ratio of anhydrous ethanol to Tween-80 is 1:2.

[0050] S2: Place the pre-emulsion of benzyl benzoate in a cell disruptor and emulsify it in an ice bath, adjusting the emulsification time to 5 minutes.

[0051] S3: Prepare a CaCl2 aqueous solution with a concentration of 1.2 mg / mL, and weigh an equal volume of CaCl2 aqueous solution to the benzyl benzoate emulsion into a beaker and stir in a water bath. Then, add the emulsified white benzyl benzoate emulsion dropwise into the CaCl2 aqueous solution at a certain rate. The reaction temperature is 45℃, the stirring rate is 1200 rpm, and the dropping rate is controlled at 0.2 mL / min to obtain an anti-mite microcapsule suspension.

[0052] S4: Stir and solidify the solution for 30 minutes. After solidification, transfer the product suspension into a centrifuge tube, set the rotation speed to 6000 rpm, wash and centrifuge 3 times, take the bottom precipitate and freeze-dry it. After 24 hours, benzyl benzoate / calcium alginate microcapsule powder with a particle size of 305 nm is obtained.

[0053] S5: Dissolve 7.2g PAN in 51.6g DMF, add 1.2g of the anti-mite microcapsules prepared in step S4, and stir the mixture evenly on a magnetic stirrer to obtain a polyelectrospinning solution. The anti-mite inlaid yarn is prepared through cotton blending, carding, drawing, roving, and ring spinning processes. In the carding process, the cotton web is used as a receiving device for electrospinning. The spinning process parameters are: ambient temperature 25℃, relative humidity 55%, and spinning voltage 45kV. The anti-mite inlaid yarn is then prepared through subsequent processes.

[0054] Example 4

[0055] S1: Prepare a sodium alginate aqueous solution with a concentration of 0.4 mg / mL, and then stir the sodium alginate aqueous solution at room temperature for 10 h until completely dissolved. Weigh 0.6 g of benzyl benzoate, add the emulsifier Tween-80 and the co-emulsifier anhydrous ethanol, then add 100 mL of sodium alginate aqueous solution as the aqueous phase and stir for 30 min for pre-emulsification. The mass of the emulsifier is 1 / 10 of the mass of benzyl benzoate, and the mass ratio of anhydrous ethanol to Tween-80 is 1:2.

[0056] S2: Place the pre-emulsion of benzyl benzoate in a cell disruptor and emulsify it in an ice bath, adjusting the emulsification time to 10 min.

[0057] S3: Prepare a CaCl2 aqueous solution with a concentration of 1.2 mg / mL, and weigh an equal volume of CaCl2 aqueous solution to the benzyl benzoate emulsion into a beaker and stir in a water bath. Then, add the emulsified white benzyl benzoate emulsion dropwise into the CaCl2 aqueous solution at a certain rate. The reaction temperature is 30℃, the stirring rate is 1400 rpm, and the dropping rate is controlled at 0.1 mL / min to obtain an anti-mite microcapsule suspension.

[0058] S4: Stir and solidify the solution for 30 minutes. After solidification, transfer the product suspension into a centrifuge tube, set the rotation speed to 6000 rpm, wash and centrifuge 3 times, take the bottom precipitate and freeze-dry it. After 24 hours, benzyl benzoate / calcium alginate microcapsule powder with a particle size of 432 nm is obtained.

[0059] S5: Dissolve 7.2g PAN in 51.6g DMF, add 1.2g of the anti-mite microcapsules prepared in step S4, and stir the mixture evenly on a magnetic stirrer to obtain a polyelectrospinning solution. The anti-mite inlaid yarn is prepared through cotton blending, carding, drawing, roving, and ring spinning processes. In the carding process, the cotton web is used as a receiving device for electrospinning. The spinning process parameters are: ambient temperature 25℃, relative humidity 55%, and spinning voltage 45kV. The anti-mite inlaid yarn is then prepared through subsequent processes.

[0060] Example 5

[0061] S1: Prepare a sodium alginate aqueous solution with a concentration of 0.4 mg / mL, and then stir the sodium alginate aqueous solution at room temperature for 10 h until completely dissolved. Weigh 0.6 g of benzyl benzoate, add the emulsifier Tween-80 and the co-emulsifier anhydrous ethanol, then add 100 mL of sodium alginate aqueous solution as the aqueous phase and stir for 30 min for pre-emulsification. The mass of the emulsifier is 1 / 30 of the mass of benzyl benzoate, and the mass ratio of anhydrous ethanol to Tween-80 is 1:2.

[0062] S2: Place the pre-emulsion of benzyl benzoate in a cell disruptor and emulsify it in an ice bath, adjusting the emulsification time to 20 min.

[0063] S3: Prepare a CaCl2 aqueous solution with a concentration of 1.2 mg / mL, and weigh an equal volume of CaCl2 aqueous solution to the benzyl benzoate emulsion into a beaker and stir in a water bath. Then, add the emulsified white benzyl benzoate emulsion dropwise into the CaCl2 aqueous solution at a certain rate. The reaction temperature is 60℃, the stirring rate is 600 rpm, and the dropping rate is controlled at 0.5 mL / min to obtain an anti-mite microcapsule suspension.

[0064] S4: Stir and solidify the solution for 30 min. After solidification, transfer the product suspension into a centrifuge tube, set the speed to 6000 rpm, wash and centrifuge 3 times, take the bottom precipitate and freeze-dry it. After 24 h, benzyl benzoate / calcium alginate microcapsule powder with a particle size of 2.9 μm is obtained.

[0065] S5: Dissolve 7.2g PAN in 51.6g DMF, add 1.2g of the anti-mite microcapsules prepared in step S4, and stir the mixture evenly on a magnetic stirrer to obtain a polyelectrospinning solution. The anti-mite inlaid yarn is prepared through cotton blending, carding, drawing, roving, and ring spinning processes. In the carding process, the cotton web is used as a receiving device for electrospinning. The spinning process parameters are: ambient temperature 25℃, relative humidity 55%, and spinning voltage 45kV. The anti-mite inlaid yarn is then prepared through subsequent processes.

[0066] Performance tests were conducted on Examples 1 through 4 respectively. The surface morphology of the yarn was observed using a scanning electron microscope, such as... Figure 3 As shown, submicron fibers exist in the yarn in the form of adhering to the surface of cotton fibers and filling the pores of cotton fibers. Due to the size difference between the two, the effect on the macroscopic morphology of the yarn is not significant. Microcapsules and mite-resistant inlaid yarn were placed in a constant temperature environment of 25°C for 21 days. One-sixth of the yarn was taken out on days 1, 3, 5, 7, 14, and 21, and immersed in an ethanol solution for ultrasonic extraction to extract the mite-resistant agent into the ethanol. The mite-resistant agent content was then tested. Measurements showed that the mite-resistant agent retention rate in both microcapsules and mite-resistant inlaid yarn was above 90%, but the mite-resistant inlaid yarn had a higher retention rate than the microcapsules. Taking the specific data from Example 4 as an example... Figure 4As shown, after being placed at 25°C for 21 days, the retention rates of the anti-mite agent in the microcapsules and the anti-mite inlaid yarn were 93.5% and 96.2%, respectively. This indicates that through multiple encapsulations, the anti-mite agent in the inlaid yarn can achieve long-term retention. Furthermore, the mite repellency performance of the yarn was tested according to GB / T 24253-2009 "Evaluation of Anti-mite Performance of Textiles". The mite repellency rates of the anti-mite inlaid yarns prepared in Examples 1-4 were all above 90%. Taking Example 4 as an example, its mite repellency rate reached 97.79%, resulting in a better anti-mite effect.

Claims

1. A method for preparing a mite-proof inlaid spun yarn, comprising: Step (1) preparing a mite-proof microcapsule, wherein the core material of the mite-proof microcapsule contains an oily mite-proof agent, and the wall material is calcium alginate; wherein the method for preparing the mite-proof microcapsule comprises: adding an emulsifier, a co-emulsifier and an aqueous sodium alginate solution into the oily mite-proof agent, pre-emulsifying to obtain a pre-emulsion, then ice-bath emulsifying to obtain an emulsion; dropping the emulsion into a crosslinking agent stirred in a water bath, reacting to obtain a mite-proof microcapsule suspension, then stirring and solidifying, centrifugal washing and freeze-drying to obtain the mite-proof microcapsule; wherein the oily mite-proof agent is one or more of natural plant essential oil, eugenol and aromatic carboxylic acid ester; the emulsifier is Tween-80; the co-emulsifier is anhydrous ethanol; the addition amount of the oily mite-proof agent in the emulsion is 0.4-1.4 wt%, the concentration of the aqueous sodium alginate solution is 0.02-0.1 wt%, the mass of the emulsifier is 1 / 30-1 / 6 of the mass of the oily mite-proof agent, and the mass ratio of the co-emulsifier to the emulsifier is 1:2; the particle size of the mite-proof microcapsule is 200-700 nm; Step (2) mixing a polymer, a solvent and the mite-proof microcapsule to obtain a spinning solution, and according to the quality requirements of spinning, blending, carding and spinning, an electrospinning device is installed between the cotton stripping and the slivering device in the carding stage to perform electrospinning, thereby obtaining the mite-proof inlaid spun yarn.

2. The preparation method according to claim 1, characterized in that, The method for preparing the wall material of the microcapsule is one of sharp-hole-coagulation-bath method, spray drying method, complex coacervation method, interfacial polymerization method and in-situ polymerization method.

3. The preparation method according to claim 1, characterized in that, The ice-bath emulsifying time in step (1) is 5-20 min; the crosslinking agent is a calcium chloride solution with a concentration of 0.06-0.2 wt%; the dropping speed of the emulsion is 0.1-0.5 mL / min; the stirring speed of the water bath is 600-1400 rpm; and the reaction temperature is 15-60℃.

4. The preparation method according to claim 1, characterized in that, The polymer in step (2) is one or more of polyacrylonitrile (PAN), polyurethane (PU), cellulose acetate (CA), polylactic acid (PLA) and polyvinyl alcohol (PVA); and the solvent is one or more of N, N-dimethylformamide (DMF), acetone, acetic acid and deionized water.

5. The method of claim 1, wherein the step of forming the first and second layers is performed by a process selected from the group consisting of: sputtering, evaporation, and chemical vapor deposition. The mass ratio of the polymer to the solvent in step (2) is 1:6-1:12; and the addition amount of the mite-proof microcapsule is 1 / 12-1 / 4 of the mass of PAN.

6. The preparation method according to claim 1, characterized in that, The electrospinning process parameters in step (2) are as follows: the ambient temperature is 18-28℃, the ambient relative humidity is 35%-70%, the vertical distance between the electrospinning nozzle and the cotton web is 15-30 cm, and the applied voltage is 40-65 kV. 7.A mite-proof inlaid spun yarn prepared by the method of claim 1.

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