A thermal insulation basalt fiber core-spun yarn and its preparation method and application

Abstract

The present application relates to a thermal insulation basalt fiber core-spun yarn in the technical field of core-spun yarn, and its preparation method and application. The core yarn in the core-spun yarn is basalt fiber, and the outer fiber is a heat-regulating energy storage nanofiber with a skin / core structure; wherein the core material in the heat-regulating energy storage nanofiber is an alkyl acrylate polymer, and the skin material is an acrylonitrile-vinylidene chloride copolymer. The core material of the outer fiber in the thermal insulation basalt core-spun yarn provided in the present application is a phase change material alkyl acrylate polymer, which has excellent heat storage performance. Therefore, the prepared thermal insulation basalt fiber core-spun yarn has excellent still air adsorption capacity, good thermal insulation performance, and extended temperature adjustment time. At the same time, the preparation method of the core-spun yarn is simple to operate and low in cost. The prepared core-spun yarn has a feather-like structure, strong thermal insulation ability, and good application prospects.

Description

Technical Field

[0001] The present application relates to the technical field of core-spun yarns, and in particular to a thermal insulation basalt fiber core-spun yarn and a preparation method and application thereof. Background Art

[0002] Basalt fiber is a continuous fiber made from basalt (or diabase) rock through a melt-drawing process. It is widely used in daily life due to its excellent mechanical properties, electrical insulation, corrosion resistance, high-temperature resistance, and other excellent properties. However, little research has been conducted on the thermal insulation properties of basalt fiber. If its thermal insulation properties can be improved, it will have great application prospects in building insulation.

[0003] Previous studies on the thermal insulation properties of basalt fiber have used coating methods to prepare basalt fiber into insulation boards. For example, prior art discloses a basalt fiber interior wall insulation mesh fabric, which is made by coating and drying a basalt fiber mesh fabric. The basalt fiber mesh fabric is woven from continuous basalt fiber strands twisted into basalt fiber yarns. The coating slurry used for the surface coating contains the following components: 2.8-3.5% film-forming agent, 0.3-0.5% lubricant, 0.1-0.5% antistatic agent, and 0.3-0.7% coupling agent. This technology uses a coating slurry to coat the surface of basalt fiber mesh cloth made of basalt fiber raw yarn. The prepared basalt fiber mesh cloth not only has the characteristics of light weight, high strength, heat resistance, fire resistance, corrosion resistance, crack resistance, and dimensional stability, but also can effectively avoid the overall surface tension shrinkage of the plaster layer and cracking caused by external forces. It has strong tensile strength and fracture resistance and can be used in wall renovation and interior wall insulation. However, this technology is complicated to operate and is not conducive to its promotion and use.

[0004] Core-spun yarn is made by wrapping a core yarn with a covering fiber. It combines the excellent properties of the covering fiber, such as good texture, fluffiness, and high fullness, with the strength, elongation, shape retention, drape, and wrinkle resistance of the core yarn as a skeleton yarn. Therefore, wrapping a layer of fiber with thermal insulation properties around the outside of basalt fiber will help improve its thermal insulation performance. Summary of the Invention

[0005] In order to address the shortcomings of the existing technology, the present application provides a thermal insulation basalt fiber core-spun yarn, which uses basalt fiber as the core yarn and wraps heat-regulating and energy-storing nanofibers with a skin / core structure on it. The prepared thermal insulation basalt fiber core-spun yarn significantly improves the static air adsorption capacity of the basalt fiber, thereby improving its thermal insulation performance and extending the temperature regulation time.

[0006] To this end, the first aspect of the present application provides a thermal insulation basalt fiber core-spun yarn, wherein the core yarn in the core-spun yarn is basalt fiber, and the outer fiber is a thermal regulating energy storage nanofiber with a skin / core structure; wherein the core material in the thermal regulating energy storage nanofiber is an alkyl acrylate polymer, and the skin material is an acrylonitrile-vinylidene chloride copolymer.

[0007] In the present application, the core material of the outer fiber in the core-spun yarn is a phase change material n-alkyl acrylate polymer, the phase change temperature of the n-alkyl acrylate polymer is close to the human body temperature, and it has excellent heat storage performance; after the outer fiber is wrapped on the basalt fiber, the static air adsorption capacity of the basalt fiber can be significantly improved, thereby improving its thermal insulation performance and extending the temperature regulation time. It can be well used in temperature-regulating fibers and clothing and building energy-saving structures, and has good application prospects.

[0008] In some embodiments, the n-alkyl acrylate polymer is selected from at least one of poly-n-octadecyl acrylate, poly-n-hexadecyl acrylate, poly-n-tetradecyl acrylate, and poly(n-tetradecyl acrylate-n-hexadecyl acrylate).

[0009] In the present application, the phase transition temperature of the above-mentioned n-alkyl acrylate polymer is more suitable and the heat storage performance is better, thereby effectively improving the thermal insulation performance of the obtained thermal insulation basalt fiber core-spun yarn.

[0010] The n-alkyl acrylate polymer used in the present application can be prepared by a free radical polymerization method.

[0011] In some embodiments, the n-alkyl acrylate polymer is poly(n-tetradecyl acrylate-n-hexadecyl acrylate); and the molar ratio of n-tetradecyl acrylate monomer to n-hexadecyl acrylate monomer in the poly(n-tetradecyl acrylate-n-hexadecyl acrylate) is (0.5-1.5):(0.5-1.5).

[0012] In some preferred embodiments, the molar ratio of the n-tetradecyl acrylate monomer to the n-hexadecyl acrylate monomer in the poly(n-tetradecyl acrylate-n-hexadecyl acrylate) is 1:1.

[0013] The present application can help further improve the thermal insulation performance of the thermal insulation basalt fiber core-spun yarn by selecting a n-alkyl acrylate copolymer with a molar ratio of n-tetradecyl acrylate monomer to n-hexadecyl acrylate monomer of 1:1.

[0014] In some embodiments, graphene is added to the n-alkyl acrylate polymer, and the content of the graphene in the n-alkyl acrylate polymer is 0.5 to 2 wt %.

[0015] In some specific embodiments, the content of the graphene in the n-alkyl acrylate polymer is 0.5 wt%, 1.0 wt%, 1.5 wt% or 2.0 wt%, etc. In some preferred embodiments, the content of the graphene in the n-alkyl acrylate polymer is 1.0 wt%.

[0016] In the present application, graphene has very high thermal conductivity. Adding graphene to the n-alkyl acrylate polymer can improve the heat storage performance of the n-alkyl acrylate polymer, thereby further improving the thermal insulation performance of the obtained thermal insulation basalt core-spun yarn.

[0017] In some embodiments, the molar ratio of acrylonitrile monomer to vinylidene chloride monomer in the acrylonitrile-vinylidene chloride copolymer is (50-70):(50-30).

[0018] In some preferred embodiments, the molar ratio of acrylonitrile monomer to vinylidene chloride monomer in the acrylonitrile-vinylidene chloride copolymer is 70:30. The acrylonitrile-vinylidene chloride copolymer used in this application is a commercially available product, and its molecular weight can be 5,000 to 500,000.

[0019] The second aspect of the present application provides a method for preparing the core-spun yarn according to the first aspect of the present application, the method comprising the following steps:

[0020] S1, preparing a tetrahydrofuran solution of an n-alkyl acrylate polymer and a dimethylformamide solution of an acrylonitrile-vinylidene chloride copolymer;

[0021] S2, ejecting the tetrahydrofuran solution of the n-alkyl acrylate polymer and the dimethylformamide solution of the acrylonitrile-vinylidene chloride copolymer through a coaxial needle to prepare a thermally regulated energy storage nanofiber having a skin / core structure by electrospinning;

[0022] S3, collecting the heat-regulating and energy-storing nanofibers with a skin / core structure through a metal funnel, and then winding and coating the nanofibers on basalt fibers to form heat-insulating basalt fiber core-spun yarns.

[0023] This application uses a multi-nozzle coaxial electrospinning method to produce a core-spun basalt fiber yarn. Basalt fiber is used as the core yarn and coated with a heat-regulating and energy-storing nanofiber with a skin / core structure and a phase change material as the core. This method produces a thermal insulation basalt fiber core-spun yarn. The preparation method is simple and low-cost. The resulting thermal insulation basalt fiber core-spun yarn has a down-like fiber structure and strong thermal insulation capabilities. The coated phase change material, an n-alkyl acrylate polymer, can adjust the phase transition temperature and significantly improve the basalt fiber's still air adsorption capacity, resulting in excellent thermal insulation properties and greater ease of use.

[0024] In some embodiments, in step S1, the content of the n-alkyl acrylate polymer in the tetrahydrofuran solution is 20-60 wt %, and the content of the acrylonitrile-vinylidene chloride copolymer in the dimethylformamide solution is 10-20 wt %.

[0025] In some preferred embodiments, the content of the n-alkyl acrylate polymer in the tetrahydrofuran solution of the n-alkyl acrylate polymer is 50 wt %, and the content of the acrylonitrile-vinylidene chloride copolymer in the dimethylformamide solution of the acrylonitrile-vinylidene chloride copolymer is 15 wt %.

[0026] In this application, the prepared tetrahydrofuran (THF) solution of n-alkyl acrylate polymer is the core material solution of the heat-regulating energy storage nanofiber with a skin / core structure, and the prepared dimethylformamide (DMF) solution of acrylonitrile-vinylidene chloride copolymer is the skin material solution of the heat-regulating energy storage nanofiber with a skin / core structure. The core material solution and the skin material solution are sprayed through a coaxial needle, and the coaxial electrospinning technology is used to prepare the heat-regulating energy storage nanofiber with a skin / core structure. The schematic diagram of the coaxial electrospinning equipment principle is shown in FIG. Figure 1 Furthermore, by controlling the content of the n-alkyl acrylate polymer in the tetrahydrofuran solution of the n-alkyl acrylate polymer and the content of the acrylonitrile-vinylidene chloride copolymer in the dimethylformamide solution of the acrylonitrile-vinylidene chloride copolymer within the above-mentioned ranges, the thermal energy storage performance of the prepared thermal energy storage nanofiber having a sheath / core structure can be improved, thereby improving the thermal insulation performance of the thermal insulation basalt fiber core-spun yarn.

[0027] In some embodiments, in step S2, the ejection rate of the dimethylformamide solution of acrylonitrile-vinylidene chloride copolymer in the coaxial needle is 0.18 to 0.36 mL / h, the ejection rate of the tetrahydrofuran solution of n-alkyl acrylate polymer in the coaxial needle is 0.01 to 0.02 mL / h, and the electrospinning voltage is 15 to 20 kV.

[0028] In some preferred embodiments, the ejection rate of the dimethylformamide solution of acrylonitrile-vinylidene chloride copolymer in the coaxial needle is 0.36 mL / h, the ejection rate of the tetrahydrofuran solution of n-alkyl acrylate polymer in the coaxial needle is 0.01 mL / h, and the electrospinning voltage is 20 kV.

[0029] In this application, the structure and thermal energy storage performance of the obtained skin / core structured thermal energy storage nanofibers are not only related to the composition of the skin and core materials, but also to the ejection rate of the skin material solution and the core material solution (i.e., the feed rate or propulsion rate) and the electrospinning voltage. Through research, the inventors of this application found that by controlling the ejection rate of the skin material solution and the core material solution and the electrospinning voltage within the above range, it helps to further improve the thermal energy storage performance of the obtained skin / core structured thermal energy storage nanofibers.

[0030] In the present application, when the core material solution and the skin material solution are coaxially sprayed, the inclination angle of the coaxial needle can be 45-60°, and the distance between the spinneret of the coaxial needle and the receiver (such as a metal funnel) can be 15-20 cm.

[0031] In some embodiments, in step S3, the twisting speed during the winding and covering process is 140 to 200 r / min, and the winding speed is 1.5 to 3.0 m / min.

[0032] The present application can make the obtained thermal insulation basalt fiber core-spun yarn have better structural strength, elasticity, flexibility and hand feel characteristics by controlling the twisting speed and yarn collection speed during the winding and covering process.

[0033] The third aspect of the present application provides a use of the core-spun yarn described in the first aspect of the present application or the core-spun yarn prepared by the method described in the second aspect in the preparation of thermal insulation materials.

[0034] The thermal insulation basalt core-spun yarn in this application has excellent still air adsorption capacity, which makes its thermal insulation performance better and prolongs the temperature regulation time. Therefore, it can be well used in the preparation of thermal insulation materials, such as in temperature-regulating fibers and thermal insulation clothing and energy-saving building structures, and has good application prospects.

[0035] The beneficial technical effects of this application are as follows: the core material of the outer covering fiber in the thermal insulation basalt core-spun yarn provided in this application is a phase change material, an n-alkyl acrylate polymer, whose phase transition temperature is close to human body temperature and is adjustable, and has excellent heat storage performance; the thermal insulation basalt core-spun yarn produced by wrapping the outer covering fiber around basalt fiber has excellent still air adsorption capacity, better thermal insulation performance, and extended temperature regulation time. At the same time, the core-spun yarn preparation method is simple to operate and low in cost. The resulting thermal insulation basalt fiber core-spun yarn has a down-like fiber structure, strong thermal insulation capacity, and good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the coaxial electrospinning equipment principle used in the preparation of thermally regulated energy storage nanofibers with a skin / core structure in this application.

[0037] Figure 2 Schematic diagram of the equipment principle for preparing thermal insulation basalt fiber core-spun yarn in Example 1.

[0038] Figure 3 This is a scanning electron microscope image of the thermal insulation basalt fiber core-spun yarn prepared in Example 2.

[0039] Figure 4 This is a picture of the finished product of the thermal insulation basalt fiber core-spun yarn prepared in Example 2.

[0040] Figure 5 To compare the infrared response digital photos of the cloth strips made of basalt fiber and the cloth strips made of the thermal insulation basalt fiber core-spun yarn prepared in Example 1, Example 2 and Example 5 at different times. DETAILED DESCRIPTION

[0041] To make this application easier to understand, the following examples will be used to further illustrate this application. These examples are for illustrative purposes only and are not intended to limit the scope of application of this application. Unless otherwise specified, the raw materials or components used in this application can be obtained through commercial channels or conventional methods.

[0042] The acrylonitrile-vinylidene chloride copolymer used in the following examples was purchased. The molecular weight of the acrylonitrile-vinylidene chloride copolymer was 50,000, and the molar ratio of acrylonitrile monomer to vinylidene chloride monomer was 70:30.

[0043] Preparation Example 1: Preparation of poly(n-hexadecyl acrylate)

[0044] Hexadecyl acrylate (HDA) was added to a three-necked flask and mechanically stirred at 250 r / min in a 65°C oil bath until the system reached a constant temperature. 0.5 wt% of dodecyl mercaptan (NDM) as a reaction raw material was added and reacted for 4 h. The temperature was then gradually raised to 180°C and the reaction was terminated after 4 h to obtain hexadecyl polyacrylate.

[0045] Preparation Example 2: Preparation of poly(n-tetradecyl acrylate-n-hexadecyl acrylate) n-Tetradecyl acrylate (TDA) and n-hexadecyl acrylate (HDA) were added to a three-necked flask in a molar ratio of 1:1, and the mixture was mechanically stirred at 250 r / min in a 65°C oil bath until the system reached a constant temperature. 0.5 wt% of dodecyl mercaptan (NDM) as a reaction raw material was added and reacted for 4 hours. The temperature was then gradually raised to 180°C and the reaction was terminated after 4 hours to obtain poly(n-tetradecyl acrylate-n-hexadecyl acrylate). The molar ratio of TDA monomer to HDA ​​monomer in the obtained poly(n-tetradecyl acrylate-n-hexadecyl acrylate) was 1:1.

[0046] Preparation Example 3: Preparation of Poly(n-tetradecyl acrylate-n-hexadecyl acrylate) The preparation process was essentially the same as in Preparation Example 2, except that n-tetradecyl acrylate (TDA) and n-hexadecyl acrylate (HDA) were added to a three-necked flask at a molar ratio of 0.5:1. The resulting poly(n-tetradecyl acrylate-n-hexadecyl acrylate) had a molar ratio of TDA to HDA ​​of 0.5:1.

[0047] Preparation Example 4: Preparation of Poly(n-tetradecyl acrylate-n-hexadecyl acrylate) The preparation process was essentially the same as in Preparation Example 2, except that n-tetradecyl acrylate (TDA) and n-hexadecyl acrylate (HDA) were added to a three-necked flask at a molar ratio of 1:0.5. The resulting poly(n-tetradecyl acrylate-n-hexadecyl acrylate) had a molar ratio of TDA to HDA ​​of 1:0.5.

[0048] Preparation Example 5: Preparation of poly(n-tetradecyl acrylate-n-hexadecyl acrylate) added with graphene. Tetradecyl acrylate (TDA), hexadecyl acrylate (HDA) and graphene were added to a three-necked flask, wherein the molar ratio of n-tetradecyl acrylate (TDA) to n-hexadecyl acrylate (HDA) was 1:1, and the amount of graphene added was 1 wt% of the total weight of TDA and HDA. The mixture was mechanically stirred at 250 r / min in a 65°C oil bath until the system reached a constant temperature. 0.5 wt% of dodecyl mercaptan (NDM) as a reaction raw material was added and reacted for 4 h. The mixture was then gradually heated to 180°C and reacted for 4 h to obtain poly(n-tetradecyl acrylate-n-hexadecyl acrylate) added with graphene, wherein the molar ratio of TDA monomer to HDA ​​monomer was 1:1 and the content of graphene was 1 wt%.

[0049] Preparation Example 6: Preparation of Graphene-Added Poly(n-tetradecyl acrylate-n-hexadecyl acrylate) The preparation process was essentially the same as that of Preparation Example 5, except that the amount of graphene added was 0.5 wt % based on the total weight of TDA and HDA. The resulting graphene-added poly(n-tetradecyl acrylate-n-hexadecyl acrylate) had a molar ratio of TDA to HDA ​​of 1:1 and a graphene content of 0.5 wt %.

[0050] Preparation Example 7: Preparation of Graphene-Added Poly(n-tetradecyl acrylate-n-hexadecyl acrylate) The preparation process was essentially the same as that of Preparation Example 5, except that the amount of graphene added was 2.0 wt % based on the total weight of TDA and HDA. The resulting graphene-added poly(n-tetradecyl acrylate-n-hexadecyl acrylate) had a molar ratio of TDA to HDA ​​of 1:1 and a graphene content of 2.0 wt %.

[0051] Example 1: Preparation of thermal insulation basalt fiber core-spun yarn

[0052] The poly(n-hexadecyl acrylate) prepared in Preparation Example 1 was dissolved in tetrahydrofuran to prepare a tetrahydrofuran solution of poly(n-hexadecyl acrylate) (core material solution), wherein the poly(n-hexadecyl acrylate) content in the solution was 50 wt %. An acrylonitrile-vinylidene chloride copolymer was dissolved in dimethylformamide to prepare a dimethylformamide solution of acrylonitrile-vinylidene chloride copolymer (skin material solution), wherein the acrylonitrile-vinylidene chloride copolymer content in the solution was 15 wt %.

[0053] The prepared skin material solution and core material solution were sprayed out through a coaxial needle, and electrospinning was used to produce thermally regulated energy storage nanofibers with a skin / core structure; the spraying rate of the skin material solution was 0.36 mL / h, the spraying rate of the core material solution was 0.01 mL / h, the electrospinning voltage was 20 kV, the inclination angle of the coaxial needle could be 45°, and the distance between the spinneret of the coaxial needle and the receiver was 15 cm.

[0054] The ejected heat-regulating and energy-storing nanofibers with a skin / core structure are collected by a metal funnel and then wrapped around basalt fibers to form thermal insulation basalt fiber core-spun yarn; the twisting speed during wrapping is 140 r / min, and the yarn collection speed is 1.5 m / min. The schematic diagram of the equipment principle for preparing thermal insulation basalt fiber core-spun yarn in this embodiment is shown in the figure. Figure 2 shown.

[0055] Example 2-4: Preparation of thermal insulation basalt fiber core-spun yarn

[0056] The preparation process is basically the same as that of Example 1, except that the poly(n-tetradecyl acrylate-n-hexadecyl acrylate) prepared in Preparation Examples 2-4 is used to replace the poly(n-hexadecyl acrylate) prepared in Preparation Example 1. The scanning electron microscope image of the thermal insulation basalt fiber core-spun yarn prepared in Example 2 is as follows: Figure 3 As shown in the figure, the finished product of the prepared thermal insulation basalt fiber core-spun yarn is as shown in the figure Figure 4 shown.

[0057] Example 5-7: Preparation of thermal insulation basalt fiber core-spun yarn

[0058] The preparation process is basically the same as that of Example 1, except that the poly(n-tetradecyl acrylate-n-hexadecyl acrylate) prepared in Preparation Examples 5-7, which are added with graphene, is used to replace the poly(n-hexadecyl acrylate) prepared in Preparation Examples 1.

[0059] Example 8: Preparation of thermal insulation basalt fiber core-spun yarn

[0060] The preparation process is basically the same as that of Example 1, except that the content of n-hexadecyl polyacrylate in the tetrahydrofuran solution is 20 wt % when the core material solution is prepared.

[0061] Example 9: Preparation of thermal insulation basalt fiber core-spun yarn

[0062] The preparation process is basically the same as that of Example 1, except that the content of n-hexadecyl polyacrylate in the tetrahydrofuran solution is 60 wt % when the core material solution is prepared.

[0063] Example 10: Preparation of thermal insulation basalt fiber core-spun yarn

[0064] The preparation process was basically the same as that in Example 1, except that the ejection rate of the skin material solution was 0.36 mL / h, the ejection rate of the core material solution was 0.02 mL / h, and the electrospinning voltage was 15 kV.

[0065] Example 11: Preparation of thermal insulation basalt fiber core-spun yarn

[0066] The preparation process was basically the same as that of Example 1, except that the ejection rate of the skin material solution was 0.36 mL / h, the ejection rate of the core material solution was 0.005 mL / h, and the electrospinning voltage was 15 kV.

[0067] Example 12: Preparation of thermal insulation basalt fiber core-spun yarn

[0068] The preparation process was basically the same as that of Example 1, except that the ejection rate of the skin material solution was 0.18 mL / h, the ejection rate of the core material solution was 0.01 mL / h, and the electrospinning voltage was 15 kV.

[0069] Test Example 1: Thermal Insulation Performance Test

[0070] The thermal insulation basalt fiber core-spun yarns prepared in Examples 1-12 and the comparative basalt fibers of the same length were measured and woven into rectangular strips of about 10mm*5mm in size. The woven strips were placed in a 60°C blast oven for 2 minutes and then taken out. The thermal performance of the strips at different times was then recorded using an infrared thermal imager. The results were expressed using the temperatures of the strips after being placed for different times. The results are shown in Table 1. Among them, the infrared response digital photos of the comparative strips made of comparative basalt fibers, the strips made of the thermal insulation basalt fiber core-spun yarn prepared in Example 2, and the strips made of the thermal insulation basalt fiber core-spun yarn prepared in Example 5 at different times are shown in Table 1. Figure 5 shown.

[0071] Table 1: Temperature of the cloth strips after different periods of time

[0072]

[0073]

[0074] As can be seen from Table 1, compared with the thermal insulation performance of the cloth strips prepared from the comparative basalt fibers, the thermal insulation performance of the cloth strips prepared from the thermal insulation basalt fiber core-spun yarns prepared in Examples 1-12 of the present application is significantly improved.

[0075] From the test results of Examples 1-7 of the present application, it can be seen that when preparing thermal-regulating energy-storage nanofibers with a skin / core structure, the composition of the core material will have a significant effect on the thermal insulation performance of the thermal insulation basalt fiber core-spun yarn finally obtained. Compared with the phase-changing material poly(n-hexadecyl acrylate), the use of poly(n-tetradecyl acrylate-n-hexadecyl acrylate) (the molar ratio of TDA monomer to HDA ​​monomer is 1:1) as the core material can make the thermal insulation performance of the thermal insulation basalt fiber core-spun yarn better; at the same time, when graphene is added to poly(n-tetradecyl acrylate-n-hexadecyl acrylate), due to the high thermal conductivity of graphene, the thermal insulation basalt fiber core-spun yarn can have better heat transfer performance, which helps to further improve the thermal insulation performance of the thermal insulation basalt fiber core-spun yarn.

[0076] The test results of Examples 1 and 8-12 of the present application show that when preparing thermally regulated energy-storing nanofibers with a skin / core structure, the preparation of the core solution and the spraying rates of the core and skin solutions also affect the thermal insulation properties of the resulting thermal insulation basalt fiber core-spun yarn. When the content of n-alkyl acrylate polymer in the core solution is controlled at 50 wt%, the spraying rates of the core and skin solutions are controlled at 0.01 mL / h and 0.36 mL / h, respectively, and the electrospinning voltage is controlled at 20 kV, the thermal insulation properties of the thermal insulation basalt fiber core-spun yarn can be improved.

[0077] It should be noted that the embodiments described above are only used to explain the present application and do not constitute any limitation to the present application. The present application has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present application may be modified as specified within the scope of the claims of the present application, and the invention may be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and embodiments, it does not mean that the present application is limited to the specific examples disclosed therein. On the contrary, the present application can be extended to all other methods and applications with the same function.

Claims

1. A thermal insulation basalt fiber core-spun yarn, characterized in that: The core yarn in the core-spun yarn is basalt fiber, and the outer fiber is a thermal energy storage nanofiber with a skin / core structure; the core material in the thermal energy storage nanofiber is an n-alkyl acrylate polymer, and the skin material is an acrylonitrile-vinylidene chloride copolymer; the n-alkyl acrylate polymer is selected from at least one of poly n-octadecyl acrylate, poly n-hexadecyl acrylate, poly n-tetradecyl acrylate and poly(n-tetradecyl acrylate-n-hexadecyl acrylate); the n-alkyl acrylate polymer is poly(n-tetradecyl acrylate-n-hexadecyl acrylate); and the molar ratio of n-tetradecyl acrylate monomer to n-hexadecyl acrylate monomer in the poly(n-tetradecyl acrylate-n-hexadecyl acrylate) is (0.5~1.5):(0.5~1.5).

2. The core-spun yarn according to claim 1, characterized in that: Graphene is added to the n-alkyl acrylate polymer, and the content of the graphene in the n-alkyl acrylate polymer is 0.5-2 wt %.

3. The core-spun yarn according to claim 1, characterized in that: The molar ratio of acrylonitrile monomer to vinylidene chloride monomer in the acrylonitrile-vinylidene chloride copolymer is (50-70): (50-30).

4. A method for preparing a core-spun yarn according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: S1, preparing a tetrahydrofuran solution of an n-alkyl acrylate polymer and a dimethylformamide solution of an acrylonitrile-vinylidene chloride copolymer; S2, ejecting the tetrahydrofuran solution of the n-alkyl acrylate polymer and the dimethylformamide solution of the acrylonitrile-vinylidene chloride copolymer through a coaxial needle to prepare a thermally regulated energy storage nanofiber having a skin / core structure by electrospinning; S3, collecting the heat-regulating and energy-storing nanofibers with a skin / core structure through a metal funnel, and then winding and coating the nanofibers on basalt fibers to form heat-insulating basalt fiber core-spun yarns.

5. The method according to claim 4, characterized in that In step S1, the content of the n-alkyl acrylate polymer in the tetrahydrofuran solution of the n-alkyl acrylate polymer is 20-60 wt %, and the content of the acrylonitrile-vinylidene chloride copolymer in the dimethylformamide solution of the acrylonitrile-vinylidene chloride copolymer is 10-20 wt %.

6. The method according to claim 4 or 5, characterized in that In step S2, the ejection rate of the dimethylformamide solution of acrylonitrile-vinylidene chloride copolymer in the coaxial needle is 0.18~0.36mL / h, the ejection rate of the tetrahydrofuran solution of n-alkyl acrylate polymer in the coaxial needle is 0.01~0.02mL / h, and the electrospinning voltage is 15~20kV.

7. The method according to claim 4 or 5, characterized in that In step S3, the twisting speed during the winding and covering process is 140-200 r / min, and the winding speed is 1.5-3.0 m / min.

8. Use of the core-spun yarn according to any one of claims 1 to 3 or the core-spun yarn prepared by the method according to any one of claims 4 to 7 in preparing thermal insulation materials.

Images