Preparation method of phase-change temperature-adjusting fiber

Abstract

The invention relates to the field of temperature-adjusting fibers, and particularly discloses a preparation method of a phase-change temperature-adjusting fiber. The phase-change temperature-adjusting fiber is of a core-shell composite structure, a core layer is a lyocell fiber with wood pulp as a raw material, phase-change microcapsules are arranged on the fiber, octadecane serves as a phase-change material, and the phase-change microcapsules are formed by wrapping melamine-formaldehyde resin formed by condensation of melamine and formaldehyde. The outer layer is a shell fiber which is formed by blending polyacrylonitrile and cellulose acetate, the surface of the shell fiber contains structures such as pores, micropores and cracks, and nano titanium dioxide particles capable of absorbing ultraviolet rays are attached to the shell fiber. Experiments prove that the phase-change temperature-regulating fiber not only has a phase-change temperature-regulating function, but also has the effects of ultraviolet resistance, moisture permeability and sweat releasing. The phase-change temperature-adjusting fiber is used as a raw material, and is blended and woven with other fibers to prepare the temperature-adjusting functional fabric.

Description

Technical Field

[0001] The invention relates to the field of temperature regulating fibers, in particular to a method for preparing phase-change temperature regulating fibers. Background Art

[0002] Fiber, as the basic material for making clothing, has a long history of application, and fabrics made of different fibers have different functions. With the development of science and technology and the improvement of the quality of social life, traditional fabrics can no longer meet people's needs. Phase change material is a material that can store and release latent heat by changing the state of matter within a certain temperature range to keep its own temperature constant. When it is arranged on the fiber, the fiber can have a temperature regulating function within a certain temperature range. However, during use, people found that the phase change temperature regulating fiber has a single function. Therefore, the present invention proposes a method for preparing a phase change temperature regulating fiber, and prepares a phase change temperature regulating fiber with anti-ultraviolet and moisture perspiration effects. Summary of the invention

[0003] The object of the present invention is to provide a method for preparing a phase-change temperature-regulating fiber to solve the problem that ordinary temperature-regulating fibers have a single function.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A method for preparing a phase-change temperature-regulating fiber, the method comprising:

[0006] 1) Using melamine and formaldehyde as wall materials and octadecane as core material to prepare phase change temperature regulating microcapsule emulsion;

[0007] 2) Phase change temperature regulating microcapsule emulsion and oxidized 4-methylmorpholine,

[0008] 3) mixing with deionized water and stirring evenly to obtain a methylmorpholine microcapsule dispersion, mixing the wood pulp with the methylmorpholine microcapsule dispersion, reacting at 50-70° C. for 1-3 hours to obtain a core layer spinning solution;

[0009] 4) mixing polyacrylonitrile and N,N-dimethylformamide, and obtaining a polyacrylonitrile solution after fully dissolving, and mixing the polyacrylonitrile solution, cellulose acetate, and Tween-80, and reacting at 60-80° C. and 100-140 rpm for 3-5 hours to obtain a shell spinning solution;

[0010] 5) using the core layer spinning solution and the shell layer spinning solution as raw materials, preparing the composite fiber by coaxial electrospinning;

[0011] 6) Prepare phase change temperature regulating fiber by using nano-titanium dioxide modified composite fiber.

[0012] In the embodiment of the present application, the preparation method of the phase change temperature regulating microcapsule emulsion is:

[0013] Mix urea, melamine, aqueous formaldehyde solution and deionized water in a mass ratio of 1:1:(4 - 6):(14 - 18), stir evenly, adjust the pH with triethanolamine, react at 65 - 75°C and 700 - 800 rpm for 20 - 40 min, end the reaction, cool, and obtain a prepolymer solution;

[0014] Mix octadecane, sodium dodecyl sulfate, deionized water, and the prepolymer solution in a mass ratio of (4 - 6):(0.1 - 0.2):(16 - 20):(20 - 26), react at 45 - 55°C and 3500 - 4500 rpm for 15 - 25 min, adjust the pH with citric acid after completion, continue to react at 55 - 65°C and 440 - 460 rpm for 1.5 - 2.5 h, adjust the pH with sodium hydroxide solution after completion to obtain a phase change temperature-regulating microcapsule emulsion.

[0015] In the embodiment of the present application, the mass ratio of the phase change temperature-regulating microcapsule emulsion, N-oxide-4-methylmorpholine, and deionized water is (16 - 17):1:(30 - 34).

[0016] In the embodiment of the present application, the mass ratio of the wood pulp and the N-methylmorpholine microcapsule dispersion is (3 - 4):(98 - 102).

[0017] In the embodiment of the present application, the mass ratio of the polyacrylonitrile solution, cellulose acetate, and Tween-80 is (43 - 47):(1 - 2):(1 - 3).

[0018] In the embodiment of the present application, the method for modifying the composite fiber is as follows:

[0019] Mix titanium sulfate and deionized water in a molar ratio of 1:(42 - 46), stir evenly to obtain a titanium sulfate solution, mix urea, the titanium sulfate solution, and the composite fiber, stir evenly, react at 130 - 150°C and 10 - 20 rpm for 1.5 - 2.5 h, cool after the reaction ends, wash with absolute ethanol and deionized water, and dry to obtain a phase change temperature-regulating fiber.

[0020] In the embodiment of the present application, the mass ratio of urea, the titanium sulfate solution, and the composite fiber is (18 - 22):(100 - 110):(6 - 10).

[0021] A temperature-regulating functional fabric is woven from a blended yarn spun from the phase change temperature-regulating fiber, modal fiber, outlast gel fiber, and spandex fiber in the embodiment of the present application through three processes of opening, carding, and drawing, and the fabric gram weight is 210 g / m 2, wherein the mass fraction of the phase change temperature - regulating fiber is 34%, the mass fraction of the modal fiber is 27%, the mass fraction of the outlast viscose fiber is 30%, and the mass fraction of the spandex is 9%.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: Using the micro - encapsulation method to wrap the phase - change material can prevent the liquid leakage of the phase - change material during the solid - liquid conversion process, and at the same time, its chemical properties can be retained, increasing its stability; The raw material of the lyocell fiber is taken from natural cellulose pulp, with a wide source. The production process is a direct dissolution physical process, the solvent is non - toxic and recyclable, and the temperature used in its processing process is relatively low, which can greatly reduce the influence on the performance of the phase - change micro - capsule material; In the electronic structure of nano - titanium dioxide, there is a valence band filled with electrons and a conduction band without electrons. When irradiated by ultraviolet light, electrons will be excited, and redox reactions will occur with holes, releasing the ultraviolet radiation in the form of light and heat; The polyacrylonitrile blended with cellulose acetate has good strength, elasticity and thermal stability, which can make the structure of the composite fiber more stable; Cellulose acetate itself has a certain number of hydroxyl groups and has hydrophilicity. Adding cellulose acetate to the polyacrylonitrile solution for co - spinning, applying the structures such as pores, micropores and cracks generated by the incompatibility of the two can not only increase the attachment sites of nano - titanium dioxide, but also absorb and transfer moisture through surface effect and capillary action. Detailed implementation manners

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Polyacrylonitrile (R006262) and Tween - 80 (R012660) are provided by Shanghai Yien Chemistry. Wood pulp (degree of polymerization 550) and modal fiber (1.3 dtex) are provided by Lenzing (Nanjing). Outlast viscose fiber (1.7 dtex) is provided by Shanghai Runlian Trading. Spandex fiber (1120D) is provided by Huaian Qiao Xin New Materials.

[0025] Example 1: A preparation method of a phase - change temperature - regulating fiber, comprising the following steps:

[0026] Step 1: Mix urea, melamine, aqueous formaldehyde solution and deionized water according to a mass ratio of 1:1:5:16, stir evenly, adjust the pH to 8 - 9 with triethanolamine, react at 70 °C and 750 rpm for 30 min. After the reaction ends, cool to obtain a prepolymer mixture.

[0027] Step 2: Mix octadecane, sodium dodecyl sulfate, deionized water, and the prepolymer solution in a mass ratio of 5:0.15:18:23, stir evenly, react at 50 °C and 4000 rpm for 20 min. After completion, adjust the pH to 4 - 5 with citric acid, and continue to react at 60 °C and 450 rpm for 2 h. After completion, adjust the pH to 8 - 9 with sodium hydroxide solution to obtain the phase change temperature-regulating microcapsule emulsion.

[0028] Step 3: Mix the phase change temperature-regulating microcapsule emulsion, N-oxide-4-methylmorpholine, and deionized water in a mass ratio of 16.5:1:32, stir evenly to obtain the N-methylmorpholine microcapsule dispersion. Mix wood pulp with the N-methylmorpholine microcapsule dispersion in a mass ratio of 3.5:100, and react at 60 °C and 250 rpm for 2 h to obtain the core layer spinning solution.

[0029] Step 4: Mix polyacrylonitrile and N,N-dimethylformamide in a mass ratio of 1:12, stir evenly, and fully dissolve to obtain the polyacrylonitrile solution. Mix the polyacrylonitrile solution, cellulose acetate, and Tween-80 in a mass ratio of 45:1.5:2, and react at 70 °C and 120 rpm for 4 h to obtain the shell layer spinning solution.

[0030] Step 5: Use the coaxial electrospinning method, connect the core layer spinning solution to the inner needle and the shell layer spinning solution to the outer needle to spin out composite fibers.

[0031] Step 6: Mix titanium sulfate and deionized water in a molar ratio of 1:44, stir evenly to obtain the titanium sulfate solution. Mix urea, the titanium sulfate solution, and the composite fibers in a mass ratio of 20:105:8, stir evenly, react at 140 °C and 15 rpm for 2 h. After the reaction is completed, wash with anhydrous ethanol and deionized water, and dry to obtain the phase change temperature-regulating fibers.

[0032] A temperature-regulating functional fabric, the preparation method is as follows:

[0033] Weigh the phase change temperature-regulating fibers, Modal fibers, Outlast gel fibers, and spandex fibers prepared in the above steps in a mass ratio of 34:27:30:9. Spin these four fibers into a blended yarn through processes such as opening, carding, and drawing, and then weave to make the temperature-regulating functional fabric. The fabric gram weight is 210 g / m 2 。

[0034] Example 2: A preparation method of phase change temperature-regulating fibers, including the following steps:

[0035] Step 1: Mix urea, melamine, formaldehyde aqueous solution, and deionized water in a mass ratio of 1:1:4:14, stir evenly, adjust the pH to 8 - 9 with triethanolamine, react at 70 °C and 750 rpm for 30 min. After the reaction is completed, cool to obtain the prepolymer mixture.

[0036] Step 2: Mix octadecane, sodium dodecyl sulfate, deionized water, and prepolymer solution in a mass ratio of 4:0.1:16:20, stir evenly, react at 50 °C and 4000 rpm for 20 min. After completion, adjust the pH to 4 - 5 with citric acid, continue to react at 60 °C and 450 rpm for 2 h. After completion, adjust the pH to 8 - 9 with sodium hydroxide solution to obtain the phase change temperature-regulating microcapsule emulsion.

[0037] Step 3: Mix the phase change temperature-regulating microcapsule emulsion, N-oxide-4-methylmorpholine, and deionized water in a mass ratio of 16.5:1:32, stir evenly to obtain the N-methylmorpholine microcapsule dispersion. Mix wood pulp with the N-methylmorpholine microcapsule dispersion in a mass ratio of 3:98, and react at 60 °C and 250 rpm for 2 h to obtain the core layer spinning solution.

[0038] Step 4: Mix polyacrylonitrile and N,N-dimethylformamide in a mass ratio of 1:12, stir evenly, and fully dissolve to obtain the polyacrylonitrile solution. Mix the polyacrylonitrile solution, cellulose acetate, and Tween-80 in a mass ratio of 43:1:1, and react at 70 °C and 120 rpm for 4 h to obtain the shell layer spinning solution.

[0039] Step 5: Use the coaxial electrospinning method to connect the core layer spinning solution to the inner needle and the shell layer spinning solution to the outer needle to spin out composite fibers.

[0040] Step 6: Mix titanium sulfate and deionized water in a molar ratio of 1:44, stir evenly to obtain the titanium sulfate solution. Mix urea, the titanium sulfate solution, and the composite fibers in a mass ratio of 18:100:6, stir evenly, react at 140 °C and 15 rpm for 2 h. After the reaction is completed, wash with absolute ethanol and deionized water, and dry to obtain the phase change temperature-regulating fibers.

[0041] A temperature-regulating functional fabric, the preparation method is as follows:

[0042] Weigh the phase change temperature-regulating fibers, modal fibers, outlast gel fibers, and spandex fibers prepared in the above steps in a mass ratio of 34:27:30:9. Spin these four fibers into a blended yarn through processes such as opening, carding, and drawing, and then weave to make the temperature-regulating functional fabric. The fabric weight per unit area is 210 g / m 2 .

[0043] Example 3: A preparation method of phase change temperature-regulating fibers, comprising the following steps:

[0044] Step 1: Mix urea, melamine, aqueous formaldehyde solution and deionized water in a mass ratio of 1:1:6:18, stir evenly, adjust the pH to 8 - 9 with triethanolamine, react at 70 °C and 750 rpm for 30 min. After the reaction ends, cool to obtain a prepolymer mixture.

[0045] Step 2: Mix octadecane, sodium dodecyl sulfate, deionized water and the prepolymer solution in a mass ratio of 6:0.2:20:26, stir evenly, react at 50 °C and 4000 rpm for 20 min. After the reaction ends, adjust the pH to 4 - 5 with citric acid, continue to react at 60 °C and 450 rpm for 2 h, and then adjust the pH to 8 - 9 with sodium hydroxide solution to obtain a phase change temperature regulating microcapsule emulsion.

[0046] Step 3: Mix the phase change temperature regulating microcapsule emulsion, N - oxide - 4 - methylmorpholine and deionized water in a mass ratio of 16.5:1:32, stir evenly to obtain a 4 - methylmorpholine microcapsule dispersion. Mix wood pulp with the 4 - methylmorpholine microcapsule dispersion in a mass ratio of 4:102, and react at 60 °C and 250 rpm for 2 h to obtain a core - layer spinning solution.

[0047] Step 4: Mix polyacrylonitrile and N,N - dimethylformamide in a mass ratio of 1:12, stir evenly, and fully dissolve to obtain a polyacrylonitrile solution. Mix the polyacrylonitrile solution, cellulose acetate and Tween - 80 in a mass ratio of 47:2:3, and react at 70 °C and 120 rpm for 4 h to obtain a shell - layer spinning solution.

[0048] Step 5: Use the coaxial electrospinning method, connect the core - layer spinning solution to the inner needle and the shell - layer spinning solution to the outer needle to spin out composite fibers.

[0049] Step 6: Mix titanium sulfate and deionized water in a molar ratio of 1:44, stir evenly to obtain a titanium sulfate solution. Mix urea, the titanium sulfate solution and the composite fibers in a mass ratio of 22:110:10, stir evenly, react at 140 °C and 15 rpm for 2 h. After the reaction ends, wash with anhydrous ethanol and deionized water, and dry to obtain phase change temperature regulating fibers.

[0050] A temperature - regulating functional fabric, the preparation method is as follows:

[0051] Weigh the phase change temperature regulating fibers, Modal fibers, Outlast gel fibers and spandex fibers prepared in the above steps in a mass ratio of 34:27:30:9. Spin these four kinds of fibers into a blended yarn through processes such as opening, carding and drawing, and then weave to make a temperature - regulating functional fabric. The fabric weight per unit area is 210 g / m 2 .

[0052] Comparative Example 1: Taking Example 1 as a control, in Comparative Example 1, no microcapsule emulsion is added, and the rest of the processes remain unchanged.

[0053] A preparation method of a phase change temperature regulating fiber, comprising the following steps:

[0054] Step 1: Mix N-oxide-4-methylmorpholine and deionized water in a mass ratio of 1:32, stir evenly to obtain a methylmorpholine dispersion liquid, mix wood pulp and the methylmorpholine dispersion liquid in a mass ratio of 3.5:100, and react at 60°C and 250 rpm for 2 h to obtain a core layer spinning solution.

[0055] Step 2: Mix polyacrylonitrile, N,N-dimethylformamide in a mass ratio of 1:32:12, stir evenly, and fully dissolve to obtain a polyacrylonitrile solution. Mix the polyacrylonitrile solution, cellulose acetate, and Tween-80 in a mass ratio of 45:1.5:2, and react at 70°C and 120 rpm for 4 h to obtain a shell layer spinning solution.

[0056] Step 3: Use the coaxial electrospinning method to connect the core layer spinning solution to the inner needle and the shell layer spinning solution to the outer needle to spin out composite fibers.

[0057] Step 4: Mix titanium sulfate and deionized water in a molar ratio of 1:44, stir evenly to obtain a titanium sulfate solution. Mix urea, the titanium sulfate solution, and the composite fibers in a mass ratio of 20:105:8, stir evenly, react at 140°C and 15 rpm for 2 h. After the reaction, wash with absolute ethanol and deionized water, and dry to obtain the phase change temperature regulating fiber.

[0058] A temperature regulating functional fabric, the preparation method is:

[0059] Weigh the phase change temperature regulating fiber, modal fiber, outlast gel fiber, and spandex fiber prepared in the above steps in a mass ratio of 34:27:30:9. Spin these four fibers into a blended yarn through processes such as opening, carding, and drawing, and then weave to make a temperature regulating functional fabric, and the fabric weight is 210 g / m 2 .

[0060] Comparative Example 2: Taking Example 1 as a control, Comparative Example 2 does not add nano-titanium dioxide, and the rest of the processes remain unchanged.

[0061] A preparation method of a phase change temperature regulating fiber, comprising the following steps:

[0062] Step 1: Mix urea, melamine, formaldehyde aqueous solution and deionized water in a mass ratio of 1:1:5:16, stir evenly, adjust the pH to 8-9 with triethanolamine, react at 70°C and 750 rpm for 30 min, and after the reaction, cool to obtain a prepolymer mixture.

[0063] Step 2: Mix octadecane, sodium dodecyl sulfate, deionized water, and the prepolymer solution in a mass ratio of 5:0.15:18:23, stir evenly, react at 50 °C and 4000 rpm for 20 min. After completion, adjust the pH to 4 - 5 with citric acid, continue to react at 60 °C and 450 rpm for 2 h. After completion, adjust the pH to 8 - 9 with sodium hydroxide solution to obtain the phase change temperature-regulating microcapsule emulsion.

[0064] Step 3: Mix the phase change temperature-regulating microcapsule emulsion, N-oxide-4-methylmorpholine, and deionized water in a mass ratio of 16.5:1:32, stir evenly to obtain the N-methylmorpholine microcapsule dispersion. Mix wood pulp with the N-methylmorpholine microcapsule dispersion in a mass ratio of 3.5:100, and react at 60 °C and 250 rpm for 2 h to obtain the core layer spinning solution.

[0065] Step 4: Mix polyacrylonitrile and N,N-dimethylformamide in a mass ratio of 1:32:12, stir evenly, and fully dissolve to obtain the polyacrylonitrile solution. Mix the polyacrylonitrile solution, cellulose acetate, and Tween-80 in a mass ratio of 45:1.5:2, and react at 70 °C and 120 rpm for 4 h to obtain the shell layer spinning solution.

[0066] Step 5: Use the coaxial electrospinning method to connect the core layer spinning solution to the inner needle and the shell layer spinning solution to the outer needle to spin out the phase change temperature-regulating fiber.

[0067] A temperature-regulating functional fabric, the preparation method is as follows:

[0068] Weigh the phase change temperature-regulating fiber, Modal fiber, Outlast gel fiber, and spandex fiber prepared in the above steps in a mass ratio of 34:27:30:9. Spin these four fibers into a blended yarn through processes such as opening, carding, and drawing, and then weave to make the temperature-regulating functional fabric. The fabric weight is 210 g / m 2 。

[0069] Comparative Example 3: Taking Example 1 as a control, in Comparative Example 3, cellulose acetate is not added, and the rest of the processes remain unchanged.

[0070] A preparation method of a phase change temperature-regulating fiber, comprising the following steps:

[0071] Step 1: Mix urea, melamine, aqueous formaldehyde solution, and deionized water in a mass ratio of 1:1:5:16, stir evenly, adjust the pH to 8 - 9 with triethanolamine, react at 70 °C and 750 rpm for 30 min. After the reaction is completed, cool to obtain the prepolymer mixture.

[0072] Step 2: Mix octadecane, sodium dodecyl sulfate, deionized water, and prepolymer solution in a mass ratio of 5:0.15:18:23, stir evenly, react at 50 °C and 4000 rpm for 20 min. After completion, adjust the pH to 4 - 5 with citric acid, continue to react at 60 °C and 450 rpm for 2 h. After completion, adjust the pH to 8 - 9 with sodium hydroxide solution to obtain the phase change temperature-regulating microcapsule emulsion.

[0073] Step 3: Mix the phase change temperature-regulating microcapsule emulsion, N-oxide-4-methylmorpholine, and deionized water in a mass ratio of 16.5:1:32, stir evenly to obtain the N-methylmorpholine microcapsule dispersion. Mix wood pulp with the N-methylmorpholine microcapsule dispersion in a mass ratio of 3.5:100, and react at 60 °C and 250 rpm for 2 h to obtain the core layer spinning solution.

[0074] Step 4: Mix polyacrylonitrile and N,N-dimethylformamide in a mass ratio of 1:12, stir evenly, and fully dissolve to obtain the polyacrylonitrile solution. Mix the polyacrylonitrile solution and Tween-80 in a mass ratio of 45:2, and react at 70 °C and 120 rpm for 4 h to obtain the shell layer spinning solution.

[0075] Step 5: Use the coaxial electrospinning method, connect the core layer spinning solution to the inner needle and the shell layer spinning solution to the outer needle to spin out composite fibers.

[0076] Step 6: Mix titanium sulfate and deionized water in a molar ratio of 1:44, stir evenly to obtain the titanium sulfate solution. Mix urea, the titanium sulfate solution, and the composite fibers in a mass ratio of 20:105:8, stir evenly, react at 140 °C and 15 rpm for 2 h. After the reaction is completed, wash with absolute ethanol and deionized water, and dry to obtain the phase change temperature-regulating fibers.

[0077] A temperature-regulating functional fabric, the preparation method is as follows:

[0078] Weigh the phase change temperature-regulating fibers, modal fibers, outlast gel fibers, and spandex fibers prepared in the above steps in a mass ratio of 34:27:30:9. Spin these four fibers into a blended yarn through processes such as opening, carding, and drawing, and then weave to make the temperature-regulating functional fabric. The fabric gram weight is 210 g / m 2 。

[0079] Detection experiment:

[0080] Respectively take 6 kinds of phase change temperature-regulating fibers prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3. Spin and weave these 6 kinds of phase change temperature-regulating fibers into 6 kinds of sample fabrics. The fabric gram weight is 210 g / m 2 。

[0081] Phase change temperature regulation function test: Take a 5 cm × 5 cm specimen from 6 kinds of sample fabrics. After keeping the 6 specimens in an incubator at 25°C for 12 h, lay them flat on a constant temperature heating plate at 40°C. Measure the surface temperature of the specimens every 10 s until the surface temperature of the specimens reaches 40°C, and evaluate its temperature regulation function.

[0082] Moisture permeability test: It is determined according to "Determination of Thermal Resistance and Moisture Resistance under Steady-State Conditions for Physiological Comfort of Textiles (Evaporative Hot Plate Method)" (GB / T 11048 - 2008).

[0083] Ultraviolet resistance performance test: It is determined according to "Evaluation of Ultraviolet Resistance of Textiles" (GB / T 18830 - 2009).

[0084] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Heating rate (℃ / min) 5.6 5.7 5.6 7.9 5.7 5.8 <![CDATA[Water vapor transmission rate (g / (m 2 ·h·Pa))]]> 0.51 0.50 0.51 0.49 0.48 0.39 UV transmittance (%) 2.8％ 2.7％ 2.8％ 3.1％ 4.1％ 3.0％

[0085] Conclusion: It can be seen from the experiment that the performance of Example 1 is better than that of Comparative Example 1, Comparative Example 2, and Comparative Example 3. Compared with Example 1, the phase change microcapsules were not added in Comparative Example 1, and it showed a faster heating rate than Example 1 in the detection experiment, indicating that the added phase change microcapsules can indeed slow down the heating rate and play a role in regulating temperature; in Comparative Example 2, the composite fiber was not modified with titanium dioxide, and it showed an increase in ultraviolet transmittance in the experiment, indicating that the nano-titanium dioxide on the fiber surface can indeed absorb ultraviolet rays; in Comparative Example 3, cellulose acetate was not blended with polyacrylonitrile, and it showed a decrease in moisture permeability in the experiment, indicating that the micropores and cracks that appeared on the fiber surface after adding cellulose acetate do have moisture permeability. Based on the above, it can be shown that the fabric specimens prepared in Examples 1, 2, and 3 have the functions of phase change temperature regulation, ultraviolet resistance, and moisture permeability and sweat discharge. The phase change temperature regulation fibers prepared by the present invention have the effects of phase change temperature regulation, ultraviolet resistance, and moisture permeability and sweat discharge.

[0086] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a phase change temperature regulating fiber, characterized in that: The preparation method of the phase change temperature regulating fiber comprises: 1) Phase change temperature regulating microcapsule emulsion was prepared using melamine and formaldehyde as wall materials and octadecane as core material; 2) mixing the phase change temperature regulating microcapsule emulsion, oxidized 4-methylmorpholine and deionized water, stirring evenly to obtain a methylmorpholine microcapsule dispersion, mixing the wood pulp with the methylmorpholine microcapsule dispersion, reacting at 50-70° C. for 1-3 hours, and obtaining a core layer spinning solution; 3) mixing polyacrylonitrile and N,N-dimethylformamide, and obtaining a polyacrylonitrile solution after fully dissolving, and mixing the polyacrylonitrile solution, cellulose acetate, and Tween-80, and reacting at 60-80° C. and 100-140 rpm for 3-5 hours to obtain a shell spinning solution; 4) using the core layer spinning solution and the shell layer spinning solution as raw materials to prepare composite fibers by coaxial electrospinning; 5) Prepare phase change temperature regulating fiber by using nano-titanium dioxide modified composite fiber.

2. The method for preparing a phase change temperature regulating fiber according to claim 1, characterized in that: The preparation method of phase change microcapsule emulsion is as follows: Mix urea, melamine, formaldehyde aqueous solution and deionized water in a mass ratio of 1:1:(4-6):(14-18), stir evenly, adjust the pH with triethanolamine, react at 65-75°C and 700-800 rpm for 20-40 minutes, and cool after the reaction is completed to obtain a prepolymer solution; Octadecane, sodium dodecyl sulfate, deionized water and prepolymer solution are mixed in a mass ratio of (4-6):(0.1-0.2):(16-20):(20-26), and reacted at 45-55°C and 3500-4500 rpm for 15-25 min. After reaction, the pH value is adjusted with citric acid. The reaction is continued at 55-65°C and 440-460 rpm for 1.5-2.5 h. After reaction, the pH value is adjusted with sodium hydroxide solution to obtain a phase change temperature regulating microcapsule emulsion.

3. The method for preparing a phase change temperature regulating fiber according to claim 1, characterized in that: The mass ratio of phase change temperature regulating microcapsule emulsion, 4-methylmorpholine oxide and deionized water is (16-17):1:(30-34).

4. The method for preparing a phase change temperature regulating fiber according to claim 1, characterized in that: The mass ratio of wood pulp to methylmorpholine microcapsule dispersion is (3-4):(98-102).

5. The method for preparing a phase change temperature regulating fiber according to claim 1, characterized in that: The mass ratio of polyacrylonitrile solution, cellulose acetate and Tween-80 is (43-47):(1-2):(1-3).

6. The method for preparing a phase change temperature regulating fiber according to claim 1, characterized in that: The method of modifying the composite fiber is: Mix titanium sulfate and deionized water in a molar ratio of 1:(42-46), stir evenly to obtain a titanium sulfate solution, mix urea, the titanium sulfate solution and the composite fiber, stir evenly, react at 130-150°C and 10-20rpm for 1.5-2.5h, cool after the reaction, wash with anhydrous ethanol and deionized water, and dry to obtain a phase change temperature regulating fiber.

7. The method for preparing a phase change temperature regulating fiber according to claim 6, characterized in that: The mass ratio of urea, titanium sulfate solution and composite fiber is (18-22):(100-110):(6-10).

8. A temperature regulating functional fabric, characterized in that: The phase change temperature regulating fiber and modal fiber, outlast gel fiber and spandex fiber described in any one of claims 1 to 7 are spun into blended yarn through three processes of opening, carding and drawing, and then woven into the blended yarn. The fabric has a gram weight of 210 g / m 2 Among them, the mass fraction of phase change temperature regulating fiber is 34%, the mass fraction of modal fiber is 27%, the mass fraction of outlast viscose fiber is 30%, and the mass fraction of spandex is 9%.