Microcapsule melt-spun spandex fiber with deodorizing function and preparation method thereof

Abstract

The application discloses a kind of microcapsule melt spinning spandex fiber with deodorization function and preparation method thereof, belong to spandex fiber technical field.The application by the active substance with deodorization function is encapsulated in microcapsule, then these microcapsules are embedded in spandex fiber, realize the function of releasing deodorizing material when spandex fiber is rubbed or stressed.The microcapsule used in the application is composed of wall material and core material, the wall material is polyurethane type microcapsule, the core material is deodorizing active substance, the core material is wrapped in the wall material to form a small container by interfacial polymerization reaction, and the active substance with deodorization function is slowly released by rubbing or extrusion, so as to play the deodorization effect.

Description

Technical Field

[0001] This invention belongs to the field of spandex fiber technology, specifically relating to a microcapsule melt-spun spandex fiber with deodorizing function and its preparation method. Background Technology

[0002] As people's living standards improve and they pay increasing attention to health and cleanliness, the market demand for deodorizing functional fibers is growing daily. The manufacturing principle involves attaching deodorizing agents and polymers to the fibers through blending and spinning, chemical bonding, physical adsorption, and microencapsulation technology. While transition metals and their metal compounds have high public acceptance for their deodorizing effects, heavy metal ions are prone to leaching from the fiber surface, raising concerns about their ecotoxicity to humans. How to improve the deodorizing efficiency of fibers while achieving safety, environmental friendliness, and pollution-free production has always been a key research focus. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a microcapsule melt-spun spandex fiber with deodorizing function and its preparation method. By encapsulating deodorizing active substances in microcapsules and then embedding these microcapsules into spandex fibers, the deodorizing substances are released when the spandex fibers are subjected to friction or pressure. The microcapsules used in this invention consist of a wall material and a core material. The wall material is a polyurethane-type microcapsule, and the core material is the deodorizing active substance. The core material is encapsulated within the wall material through an interfacial polymerization reaction to form a tiny container. The deodorizing active substance is slowly released through friction or compression, thereby exerting a deodorizing effect.

[0004] To achieve the above objectives, the present invention provides the following technical solution: One of the technical solutions of this invention is to provide a method for preparing polyurethane microcapsules, comprising the following steps: Emulsifier A is dissolved in water to obtain an aqueous phase; deodorizing core material, polyether polyol with a functionality of 2-4 and polyisocyanate with a functionality of 2-4 are mixed evenly to obtain an oil phase; the aqueous phase, the oil phase and emulsifier B are mixed and emulsified, and then an amine crosslinking agent and a catalyst are added at 50-80°C, the temperature is raised to 90-150°C and kept at 2-7h for encapsulation, and the polyurethane microcapsules are obtained after separation and drying.

[0005] The microcapsules prepared by the above method have good compatibility with spandex and can be more uniformly embedded inside spandex molecules to achieve effective encapsulation and achieve a long-lasting sustained release effect in spandex fibers.

[0006] Preferably, the deodorizing core material is selected from one or more of activated carbon, bamboo charcoal, tea tree oil, chitosan, aminoglycosides and bentonite, accounting for 30-70% of the mass of the oil phase.

[0007] Preferably, the emulsifier A is selected from one or more of styrene-maleic anhydride copolymer, sodium dodecylbenzenesulfonate and polyethylene glycol ether 600, and the amount used is 0.1 to 5.0% of the mass of the aqueous phase.

[0008] Preferably, the polyether polyol with a functionality of 2 to 4 is selected from one or more of polypropylene glycol, polypropylene triol, polypropylene-ethylene triol, and polypropylene tetraol.

[0009] Preferably, the polyisocyanate with a functionality of 2 to 4 is selected from one or more of toluene diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, tri(4-phenylisocyanate) thiophosphate, and dimethyltriphenylmethane tetraisocyanate.

[0010] Preferably, the molar ratio of -OH in the polyether polyol with a functionality of 2-4 to -NCO in the polyisocyanate with a functionality of 2-4 is 1:(3-8).

[0011] Preferably, the amount of the polyether polyol with a functionality of 2 to 4 is 10 to 25% of the oil phase mass, and the amount of the polyisocyanate with a functionality of 2 to 4 is 15 to 40% of the oil phase mass.

[0012] Preferably, the emulsifier B is selected from one or more of sodium dodecyl sulfate and / or polyvinyl alcohol, and the amount used is 0.1-5% of the total mass of the aqueous phase and the oil phase.

[0013] Preferably, the catalyst is selected from one or more of dibutyltin dilaurate, stannous octoate, and bismuth isooctanoate, and the amount used is 0.01~0.1‰ of the oil phase mass.

[0014] Preferably, the amine crosslinking agent is selected from one or more of polyethyleneimine, diethylenetriamine and butanediamine, and the amount used is 1 to 20% of the oil phase mass.

[0015] Preferably, the mass ratio of the aqueous phase to the oil phase is (5~20):1.

[0016] The second technical solution of the present invention is to provide a polyurethane microcapsule prepared according to the above-mentioned method for preparing polyurethane microcapsules.

[0017] The third technical solution of this invention provides a method for preparing microcapsule melt-spun spandex fibers with deodorizing function, comprising the following steps: Polyether-type thermoplastic polyurethane elastomer (TPU) particles with a mass ratio of 100:7~20 and the above-mentioned polyurethane microcapsules are prepared into microcapsule melt-spun spandex fibers with deodorizing function through melt spinning process.

[0018] Preferably, the raw materials for the polyether-type thermoplastic polyurethane elastomer particles include polytetrahydrofuran ether polyol, diisocyanate and diol chain extender in a molar ratio of 2:3:1.

[0019] More preferably, the polytetrahydrofuran ether polyol (PTMEG) has a weight-average molecular weight of 1000-4000; the diisocyanate is selected from one or more of toluene diisocyanate, hexamethylene diisocyanate, and diphenylmethane diisocyanate; and the diol chain extender is selected from one or more of ethylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylpentanediol, spirodiol, dodecanecycloalkanediol, and ethylhexanediol.

[0020] Preferably, the microcapsule melt-spun spandex fiber with deodorizing function has a fineness of 30D.

[0021] The fourth technical solution of the present invention provides a microcapsule melt-spun spandex fiber with deodorizing function prepared according to the above-mentioned preparation method of microcapsule melt-spun spandex fiber with deodorizing function.

[0022] The beneficial technical effects of the present invention are as follows: (1) The present invention effectively encapsulates the deodorizing active substances through microcapsule technology, thereby achieving a long-lasting slow-release effect in spandex fibers, and can maintain the deodorizing effect even after multiple washes.

[0023] (2) The polyurethane microcapsules selected in this invention have good compatibility with spandex and can be embedded in spandex molecules in a long-lasting and uniform manner.

[0024] (3) The active sites on the surface of the microcapsules prepared by the present invention can be partially covalently grafted onto the spandex molecules, which can act as crosslinking points. When combined with spandex fibers, they will not cause a decrease in the performance of spandex fibers, but will also have a significant effect on the strength and elasticity of spandex fibers.

[0025] (4) The microcapsule melt-spun spandex fiber with deodorizing function prepared by the present invention has environmentally friendly, efficient and long-lasting deodorizing function, which enhances the added value and market competitiveness of spandex fiber. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a picture of a pure cotton fabric with 12% ordinary spandex fiber content after being sprayed with phenolphthalein ammonia and squeezed and rubbed.

[0028] Figure 2 This is a photograph of a pure cotton fabric with a 12% spandex fiber content after being sprayed with phenolphthalein ammonia and squeezed and rubbed for 60 seconds.

[0029] Figure 3 This is a photograph of a pure cotton fabric with a 12% spandex fiber content after being sprayed with phenolphthalein ammonia and squeezed and rubbed for 120 seconds.

[0030] Figure 4 This is a photograph of a pure cotton fabric with 12% functional spandex fiber content after being sprayed with phenolphthalein ammonia and then squeezed and rubbed.

[0031] Figure 5 This is a photograph of a pure cotton fabric with 12% functional spandex fiber content after being sprayed with phenolphthalein ammonia and squeezed and rubbed for 60 seconds.

[0032] Figure 6 This is a photograph of a pure cotton fabric with 12% functional spandex fiber content after being sprayed with phenolphthalein ammonia and squeezed and rubbed for 120 seconds. Detailed Implementation

[0033] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention. It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the present invention.

[0034] It should be noted that any aspects not described in detail in this invention are conventional practices in the field and are not the focus of this invention.

[0035] Furthermore, regarding the numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, are also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0036] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar to or equivalent to those described herein may be used in the implementation or testing of this invention.

[0037] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0038] In the embodiments and comparative examples of this invention, "parts" refers to "parts by weight".

[0039] The weight-average molecular weight of the 3% styrene-maleic anhydride copolymer used in the embodiments and comparative examples of this invention is 150,000 g / mol.

[0040] Example 1 (1) Preparation of aqueous phase: Weigh 42 parts of 3% styrene-maleic anhydride copolymer, add 5000 parts of deionized water, stir to completely dissolve the emulsifier, and obtain the aqueous phase.

[0041] (2) Preparation of oil phase: 300 parts of activated carbon, 50 parts of commercially available polyether 204 (hydroxyl value of 255 mg KOH / g) with a functionality of 2 and 50 parts of commercially available polyether 306 (hydroxyl value of 125 mg KOH / g) with a functionality of 3 were reacted with 165.89 parts of triphenylmethane triisocyanate for 4 h to obtain oil phase, wherein the molar ratio of -NCO and -OH was 4:1.

[0042] (3) Emulsification: The oil phase is dispersed in the water phase under high-speed stirring, and 5% of the total mass of the water and oil phases of polyvinyl alcohol is added. The emulsification time is 20 min and the temperature is 50℃.

[0043] (4) Encapsulation: Under stirring at 80°C, add 43.7 parts of polyethyleneimine and stir for 1 hour, then add 11.6 parts of diethylenetriamine and 0.5‰ of dibutyltin dilaurate in the oil phase, react for 0.5 hours, raise the temperature to 90°C and keep warm for 5 hours.

[0044] (5) The obtained microcapsules are washed, filtered and dried to obtain dried polyurethane urea shell microcapsule powder.

[0045] (6) PTMEG1000, diphenylmethane diisocyanate and 1,4-butanediol were metered and directly added to a twin-screw reactor in a molar ratio of 2:3:1. After mixing and slicing, polymer P1 (i.e. polyether type TPU) was obtained. After underwater pelleting, it was dried at 120°C for later use.

[0046] (7) Melt and extrude polymer P1, add microcapsule powder to the screw end area, the mass ratio of polymer P1 to microcapsule powder is 100:7, and distribute it to the spinneret via melt metering pump and distribution plate; spin the spinning box, side blowing cooling device, spinning channel, oiling, and guide roller to produce melt-spun elastic spandex fiber with deodorizing function with a fineness of 30D.

[0047] Example 2 (1) Preparation of aqueous phase: Weigh 42 parts of 3% styrene-maleic anhydride copolymer, add 5000 parts of deionized water, stir to completely dissolve the emulsifier, and obtain the aqueous phase.

[0048] (2) Preparation of oil phase: 350 parts of bamboo charcoal, 50 parts of commercially available polyether 204 (hydroxyl value of 255 mg KOH / g) with a functionality of 2, and 50 parts of commercially available polyether 306 (hydroxyl value of 125 mg KOH / g) with a functionality of 3 were reacted with 248.84 parts of triphenylmethane triisocyanate for 4 h to obtain oil phase, wherein the molar ratio of -NCO and -OH was 6:1.

[0049] (3) Emulsification: The oil phase is dispersed in the water phase under high-speed stirring, and 5% of the total mass of the water and oil phases of polyvinyl alcohol is added. The emulsification time is 20 min and the temperature is 50℃.

[0050] (4) Encapsulation: Under stirring at 80°C, add 65.6 parts of polyethyleneimine and stir for 1 hour, then add 17.5 parts of diethylenetriamine and 0.5‰ of dibutyltin dilaurate in the oil phase, react for 0.5 hours, raise the temperature to 90°C and keep warm for 5 hours.

[0051] (5) The obtained microcapsules are washed, filtered and dried to obtain dried polyurethane urea shell microcapsule powder.

[0052] (6) PTMEG1000, diphenylmethane diisocyanate and 1,4-butanediol were metered and directly added to a twin-screw reactor in a molar ratio of 2:3:1. After mixing and slicing, polymer P1 was obtained. After underwater pelleting, it was dried at 120°C for later use.

[0053] (7) Melt and extrude polymer P1, add microcapsule powder to the screw end area, the mass ratio of polymer P1 to microcapsule powder is 100:14, and distribute it to the spinneret via melt metering pump and distribution plate; spin the spinning box, side blowing cooling device, spinning channel, oiling, and guide roller to produce melt-spun elastic spandex fiber with deodorizing function with a fineness of 30D.

[0054] Example 3 (1) Preparation of aqueous phase: Weigh 42 parts of 3% styrene-maleic anhydride copolymer, add 5000 parts of deionized water, stir to completely dissolve the emulsifier, and obtain the aqueous phase.

[0055] (2) Preparation of oil phase: 285 parts of chitosan, 50 parts of commercially available polyether 204 (hydroxyl value of 255 mg KOH / g) with a functionality of 2 and 50 parts of commercially available polyether 306 (hydroxyl value of 125 mg KOH / g) with a functionality of 3 were reacted with 165.89 parts of triphenylmethane triisocyanate for 4 h to obtain oil phase, wherein the molar ratio of -NCO and -OH was 4:1.

[0056] (3) Emulsification: The oil phase is dispersed in the water phase under high-speed stirring, and 5% of the total mass of the water and oil phases of polyvinyl alcohol is added. The emulsification time is 20 min and the temperature is 50℃.

[0057] (4) Encapsulation: Add 50 parts of polyethyleneimine and stir for 1 hour at 80°C, then add 10 parts of diethylenetriamine and 0.5‰ of dibutyltin dilaurate in the oil phase, react for 0.5 hours, raise the temperature to 90°C and keep warm for 5 hours.

[0058] (5) The obtained microcapsules are washed, filtered and dried to obtain dried polyurethane urea shell microcapsule powder.

[0059] (6) PTMEG1000, diphenylmethane diisocyanate and 1,4-butanediol were metered and directly added to a twin-screw reactor in a molar ratio of 2:3:1. After mixing and slicing, polymer P1 was obtained. After underwater pelleting, it was dried at 120°C for later use.

[0060] (7) Melt and extrude polymer P1, add microcapsule powder to the screw end area, the mass ratio of polymer P1 to microcapsule powder is 100:17, and distribute it to the spinneret via melt metering pump and distribution plate; spin the spinning box, side blowing cooling device, spinning channel, oiling, and guide roller to produce melt-spun elastic spandex fiber with deodorizing function with a fineness of 30D.

[0061] Comparative Example 1 (1) Preparation of aqueous phase: Weigh 42 parts of 3% styrene-maleic anhydride copolymer, add 5000 parts of deionized water, stir to completely dissolve the emulsifier, and obtain the aqueous phase.

[0062] (2) Preparation of oil phase: 50 parts of commercially available polyether 204 (hydroxyl value of 255 mg KOH / g) with a functionality of 2 and 50 parts of commercially available polyether 306 (hydroxyl value of 125 mg KOH / g) with a functionality of 3 were reacted with 165.89 parts of triphenylmethane triisocyanate for 4 h to obtain oil phase, wherein the molar ratio of -NCO and -OH was 4:1.

[0063] (3) Emulsification: The oil phase is dispersed in the water phase under high-speed stirring, and 5% of the total mass of the water and oil phases of polyvinyl alcohol is added. The emulsification time is 20 min and the temperature is 50℃.

[0064] (4) Encapsulation: Under stirring at 80°C, add 43.7 parts of polyethyleneimine and stir for 1 hour, then add 11.6 parts of diethylenetriamine and 0.5‰ of dibutyltin dilaurate in the oil phase, react for 0.5 hours, raise the temperature to 90°C and keep warm for 5 hours.

[0065] (5) The obtained microcapsules are washed, filtered and dried to obtain dried polyurethane urea shell microcapsule powder.

[0066] (6) PTMEG1000, diphenylmethane diisocyanate and 1,4-butanediol were metered and directly added to a twin-screw reactor in a molar ratio of 2:3:1. After mixing and slicing, polymer P1 was obtained. After underwater pelleting, it was dried at 120°C for later use.

[0067] (7) Melt and extrude polymer P1, add microcapsule powder to the screw end area, the mass ratio of polymer P1 to microcapsule powder is 100:7, and distribute it to the spinneret via melt metering pump and distribution plate; spin the spinning box, side blowing cooling device, spinning channel, oiling, and guide roller to produce melt-spun elastic spandex fiber with a fineness of 30D.

[0068] Comparative Example 2 (1) PTMEG1000, diphenylmethane diisocyanate and 1,4-butanediol were metered and directly added to a twin-screw reactor in a molar ratio of 2:3:1. After mixing and slicing, polymer P1 was obtained. After underwater pelleting, it was dried at 120°C for later use.

[0069] (2) Melt and extrude polymer P1, add activated carbon to the end area of ​​the screw, the mass ratio of polymer P1 to activated carbon is 100:7, and after being fully mixed with conventional crosslinking agent in a multi-stage static mixer, it is distributed to the spinneret by melt metering pump and distribution plate; the spinning box, side blowing cooling device, spinning channel, oiling, and guide roller are spun into melt-spun elastic spandex fiber with a fineness of 30D.

[0070] Comparative Example 3 (1) PTMEG1000, diphenylmethane diisocyanate and 1,4-butanediol were metered and directly added to a twin-screw reactor in a molar ratio of 2:3:1. After mixing and slicing, polymer P1 was obtained. After underwater pelleting, it was dried at 120°C for later use.

[0071] (2) The polymer P1 is melted and extruded, and then distributed to the spinneret via a melt metering pump and a distribution plate. The spinning box, side blowing cooling device, spinning channel, oiling, and guide roller are used to spin the elastic spandex fiber with a fineness of 30D.

[0072] Comparative Example 4 (1) Preparation of melamine-formaldehyde resin wall material microcapsules: 300 parts of activated carbon were dispersed in an aqueous phase containing 42 parts of 3% styrene-maleic anhydride copolymer and 5000 parts of deionized water. 165.89 parts of melamine-formaldehyde prepolymer were added. The mixture was stirred and emulsified at 60°C for 30 min. The temperature was raised to 80°C and kept at 3 h for encapsulation. After washing and drying, melamine-formaldehyde resin wall material microcapsule powder was obtained.

[0073] (2) PTMEG1000, diphenylmethane diisocyanate and 1,4-butanediol were metered and directly added to a twin-screw reactor in a molar ratio of 2:3:1. After mixing and slicing, polymer P1 (i.e. polyether type TPU) was obtained. After underwater pelleting, it was dried at 120°C for later use.

[0074] (3) Melt and extrude polymer P1, add microcapsule powder to the screw end area, the mass ratio of polymer P1 to microcapsule powder is 100:7, and distribute it to the spinneret via melt metering pump and distribution plate; spin the spinning box, side blowing cooling device, spinning channel, oiling, and guide roller to produce melt-spun elastic spandex fiber with deodorizing function with a fineness of 30D.

[0075] The properties of the melt-spun elastic spandex fibers prepared in Examples 1-3 and Comparative Examples 1-3 were measured, and the results are shown in Table 1.

[0076] Table 1 Properties of various melt-spun elastic spandex fibers As can be seen from the basic mechanical properties data in Table 1, adding deodorizing active substances in the form of microcapsules can enhance the mechanical properties of fibers without losing mechanical properties due to poor compatibility.

[0077] In Comparative Example 1, the microcapsules did not contain a deodorizing core material; therefore, they only served as fillers and had no deodorizing effect. Comparative Example 4 used melamine-formaldehyde resin as the wall material. Due to its poor compatibility with the polyurethane matrix, the mechanical properties of the fibers significantly decreased, demonstrating the necessity of using a polyurethane-type microcapsule wall material in this invention.

[0078] The ordinary spandex fiber prepared in Comparative Example 3 or the functional spandex fiber prepared in Example 1 was blended with cotton fiber at a mass ratio of 12:88, and then ring spun and woven to produce a pure cotton fabric with a spandex fiber content of 12%.

[0079] A 0.5% phenolphthalein ammonia solution was sprayed onto a pure cotton fabric with a common spandex fiber content of 12%. See the image below for the actual product after squeezing and rubbing. Figure 1 See the actual product image after 60 seconds. Figure 2 See the actual product image after 120 seconds. Figure 3 .

[0080] A 0.5% phenolphthalein ammonia solution was sprayed onto a pure cotton fabric with a functional spandex fiber content of 12%, and the fabric was then squeezed and rubbed with the same force. (See attached image for the final product.) Figure 4 See the actual product image after 60 seconds. Figure 5 See the actual product image after 120 seconds. Figure 6 .

[0081] Figures 1-3 and Figures 4-6 They all have irregularly shaped markings to indicate that the front and back are made of the same piece of fabric.

[0082] from Figures 1-6 As can be seen, the unfunctionalized fabric cannot decompose phenolphthalein, while the functionalized fabric can rapidly decompose it. This result indicates that the functionalized fiber has deodorizing properties. The core material (activated carbon, bamboo charcoal, chitosan, etc.) in this invention has adsorption and catalytic decomposition capabilities. Activated carbon, through its porous structure and surface active sites, can adsorb and decompose phenolphthalein, and the fading reaction of phenolphthalein can serve as a visual indicator of its deodorizing function.

[0083] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for preparing polyurethane microcapsules, characterized in that, Includes the following steps: Emulsifier A is dissolved in water to obtain an aqueous phase; deodorizing core material, polyether polyol with a functionality of 2-4 and polyisocyanate with a functionality of 2-4 are mixed evenly to obtain an oil phase; the aqueous phase, the oil phase and emulsifier B are mixed and emulsified, and then an amine crosslinking agent and a catalyst are added at 50-80°C, the temperature is raised to 90-150°C and kept at 2-7h for encapsulation, and the polyurethane microcapsules are obtained after separation and drying.

2. The method for preparing polyurethane microcapsules according to claim 1, characterized in that, The deodorizing core material is selected from one or more of activated carbon, bamboo charcoal, tea tree oil, chitosan, aminoglycosides, and bentonite, accounting for 30-70% of the oil phase mass; And / or, the emulsifier A is selected from one or more of styrene-maleic anhydride copolymer, sodium dodecylbenzenesulfonate, and polyethylene glycol ether 600, and is used in an amount of 0.1-5.0% of the aqueous phase mass; And / or, the polyether polyol with a functionality of 2 to 4 is selected from one or more of polypropylene glycol, polypropylene triol, polypropylene-ethylene triol, and polypropylene tetraol; And / or, the polyisocyanate with a functionality of 2 to 4 is selected from one or more of toluene diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, tri(4-phenylisocyanate) thiophosphate and dimethyltriphenylmethane tetraisocyanate; And / or, the amount of the polyether polyol with a functionality of 2 to 4 is 10 to 25% of the oil phase mass, and the amount of the polyisocyanate with a functionality of 2 to 4 is 15 to 40% of the oil phase mass.

3. The method for preparing polyurethane microcapsules according to claim 1, characterized in that, The molar ratio of -OH in the polyether polyol with a functionality of 2 to 4 and -NCO in the polyisocyanate with a functionality of 2 to 4 is 1:(3 to 8).

4. The method for preparing polyurethane microcapsules according to claim 1, characterized in that, The emulsifier B is selected from sodium dodecyl sulfate and / or polyvinyl alcohol, and the amount used is 0.1-5% of the total mass of the aqueous phase and the oil phase; And / or, the catalyst is selected from one or more of dibutyltin dilaurate, stannous octoate and bismuth isooctanoate, and is used in an amount of 0.01 to 0.1‰ of the oil phase mass; And / or, the amine crosslinking agent is selected from one or more of polyethyleneimine, diethylenetriamine and butanediamine, and is used in an amount of 1 to 20% of the oil phase mass.

5. The method for preparing polyurethane microcapsules according to claim 1, characterized in that, The mass ratio of the aqueous phase to the oil phase is (5~20):

1.

6. A polyurethane microcapsule prepared by the method of preparing polyurethane microcapsules according to any one of claims 1 to 5.

7. A method for preparing microcapsule melt-spun spandex fibers with deodorizing function, characterized in that, Includes the following steps: Polyether-type thermoplastic polyurethane elastomer particles with a mass ratio of 100:7~20 and polyurethane-type microcapsules as described in claim 6 are melt-spun to prepare microcapsule melt-spun spandex fibers with deodorizing function.

8. The method for preparing microcapsule melt-spun spandex fiber with deodorizing function according to claim 7, characterized in that, The raw materials for the polyether-type thermoplastic polyurethane elastomer particles include polytetrahydrofuran ether polyol, diisocyanate, and diol chain extender in a molar ratio of 2:3:

1.

9. The method for preparing microcapsule melt-spun spandex fiber with deodorizing function according to claim 8, characterized in that, The polytetrahydrofuran ether polyol has a weight-average molecular weight of 1000-4000; the diisocyanate is selected from one or more of toluene diisocyanate, hexamethylene diisocyanate, and diphenylmethane diisocyanate; the diol chain extender is selected from one or more of ethylene glycol, 1,4-butanediol, 1,6-hexanediol, trimethylpentanediol, spirodiol, dodecanecycloalkanediol, and ethylhexanediol.

10. A microcapsule melt-spun spandex fiber with deodorizing function prepared by the method of preparing microcapsule melt-spun spandex fiber with deodorizing function according to any one of claims 7 to 9.

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