Cool-feeling anti-ultraviolet bio-based polyester fiber and application thereof in fabric

Abstract

The application discloses a cool and ultraviolet-resistant bio-based polyester fiber and application thereof in a fabric, and relates to the technical field of high-performance fibers.The cool and ultraviolet-resistant bio-based polyester fiber is obtained by melt spinning of cool and ultraviolet-resistant master batches and bio-based polyester chips; the cool and ultraviolet-resistant master batches are obtained by melt blending of cool and ultraviolet-resistant functional particles and bio-based polyester; and the cool and ultraviolet-resistant functional particles are core-shell particles with the cool particles as the core and a mesoporous silica-anti-ultraviolet agent hybrid shell layer deposited on the surface in situ.The cool and ultraviolet-resistant bio-based polyester fiber prepared in the application has the characteristics of high heat conduction efficiency and good ultraviolet resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-performance fibers, in particular to a cool and ultraviolet-resistant bio-based polyester fiber and its application in fabrics. BACKGROUND

[0002] With the increasing demand for spinnable fibers today, the production of natural fibers has not been enough to meet people's needs, and people have turned their attention to synthetic fibers, among which polyester fibers occupy a very large proportion. Polyester fiber is a synthetic fiber obtained by polymerizing organic diacid and diol and then spinning. The polyester fiber produced on a large scale in industry mainly uses petroleum-based raw materials to produce 1,3-propanediol. Since petroleum resources are non-renewable and have limited reserves, in order to respond to the transformation and upgrading development of the chemical fiber industry and reduce the consumption of petroleum resources, in recent years, bio-based fibers have gradually replaced petroleum-based fibers. Bio-based polytrimethylene terephthalate (PTT) is obtained by esterification and polycondensation of terephthalic acid and 1,3-propanediol. PTT fiber is a polyester fiber obtained by chemical spinning of PTT polymer. Compared with petroleum-based PTT fiber, the raw material 1,3-propanediol in PTT fiber is obtained by microbial fermentation, which meets the requirements of sustainable development and low-carbon economy compared with petroleum-based polyester. In recent years, with the industrialization of 1,3-propanediol prepared by microbial fermentation, PTT fiber with multiple excellent functions has also developed rapidly.

[0003] With the improvement of people's living standards and the enhancement of health consciousness, consumers' requirements for the performance of textiles are increasingly high, not just meeting the basic functions of covering and keeping warm, but also demanding green and environmentally friendly fibers and fabrics with both cool and ultraviolet-resistant functions. In outdoor sports, tourism, daily commuting and other scenarios, people hope that clothes can effectively block ultraviolet rays from harming the skin, prevent skin sunburn, aging and even disease, and keep cool and comfortable in hot weather, improving the wearing experience. PTT fiber has the properties of polyester, nylon, acrylic and spandex, with good stain resistance, easy dyeing, soft hand feeling, excellent elongation recovery and other advantages. However, it is obviously insufficient in terms of ultraviolet resistance and coolness. In recent years, the market size of functional textiles has continued to grow, and the market share of products with cool and ultraviolet-resistant functions has continued to expand. This change in market demand has had a significant impact on the development of the textile industry, becoming a key driving force for technological innovation and product upgrading in the industry. SUMMARY

[0004] The purpose of the present application is to provide a cool and ultraviolet-resistant bio-based polyester fiber and its application in fabrics, which solves the following technical problems:

[0005] The existing bio-based polyester is obviously insufficient in terms of ultraviolet resistance and coolness.

[0006] The object of the present application can be achieved by the following technical solutions.

[0007] The present application discloses a cool and ultraviolet-resistant bio-based polyester fiber, and a preparation method thereof.

[0008] The cool and ultraviolet-resistant master batch is obtained by melt blending and granulating cool and ultraviolet-resistant functional particles and bio-based polyester.

[0009] The cool and ultraviolet-resistant functional particles are core-shell particles with cool particles as the core and a mesoporous silica-anti-ultraviolet agent hybrid shell layer deposited in situ on the surface.

[0010] As a further scheme of the present application, the temperature for melt blending is 260-300 DEG C.

[0011] As a further scheme of the present application, the process parameters for spinning are as follows: the spinning temperature is 270-300 DEG C, the spinning speed is 800-1500 m / min, the drawing temperature is 90-110 DEG C, the pre-drawing ratio is 1.0-1.10, the one-way drawing ratio is 2.80-3.20, and the two-way drawing ratio is 1.0-1.15.

[0012] As a further scheme of the present application, the cool and ultraviolet-resistant master batch accounts for 1-5 wt% in the cool and ultraviolet-resistant bio-based polyester fiber.

[0013] As a further scheme of the present application, the cool and ultraviolet-resistant functional particles account for 10-20 wt% in the cool and ultraviolet-resistant master batch.

[0014] As a further scheme of the present application, the preparation method of the cool and ultraviolet-resistant functional particles comprises the following steps.

[0015] S1: cool particles, anhydrous ethanol, deionized water are mixed, heated to 50-60 DEG C, hexadecyl trimethyl ammonium bromide is added and uniformly dispersed, tetraethyl orthosilicate is added, the pH of the solution is adjusted to 9-10, heated to 60-70 DEG C, and incubated for 6-9 h, centrifuged, washed, and dried to obtain composite particles;

[0016] S2: the composite particles, deionized water, anhydrous ethanol, and KH570 are added to a reaction kettle and uniformly dispersed, the temperature is controlled at 60-70 DEG C, and incubated for 1-2 h, centrifuged, washed, and dried to obtain organic composite particles;

[0017] S3: under the nitrogen atmosphere, the organic compound particles, 2-hydroxy-4-acrylate benzophenone, N, N-dimethylformamide are added into the reaction kettle and dispersed, azobisisobutyronitrile is added, the temperature is controlled at 60-70 DEG C, and the reaction is kept for 8-12 hours, centrifuged, washed, and dried to obtain the cool feeling anti-ultraviolet functional particles.

[0018] As a further scheme of the application: the addition ratio of the cool feeling particles, anhydrous ethanol, deionized water, cetyltrimethylammonium bromide, and tetraethyl orthosilicate in S1 is 10g: 50-100mL: 50-100mL: 1-5g: 5-10mL.

[0019] As a further scheme of the application: the addition ratio of the composite particles, deionized water, anhydrous ethanol, and KH570 in S2 is 10g: 50-100mL: 50-100mL: 3-6g.

[0020] As a further scheme of the application: the addition ratio of the organic compound particles, 2-hydroxy-4-acrylate benzophenone, N, N-dimethylformamide, and azobisisobutyronitrile in S3 is 10g: 2-5g: 50-100mL: 0.1-0.25g.

[0021] As a further scheme of the application: the preparation method of the cool feeling particles comprises the following steps: blending zinc nitrate hexahydrate, cerium nitrate hexahydrate, urea, and deionized water, controlling the temperature at 90-95 DEG C, stirring for 9-12 hours, filtering, washing, drying, and calcining to obtain the cool feeling particles.

[0022] As a further scheme of the application: the addition ratio of zinc nitrate hexahydrate, cerium nitrate hexahydrate, urea, and deionized water is 30g: 4-8g: 12-18g: 100-200mL.

[0023] The cool anti-ultraviolet bio-based polyester fiber is applied in the fabric.

[0024] The application has the following beneficial effects:

[0025] (1) The cool anti-ultraviolet functional particles endow the fiber with cool feeling performance

[0026] The application utilizes zinc nitrate hexahydrate and cerium nitrate hexahydrate to perform hydrothermal reaction, generates Ce 3+ Doped ZnO-CeO2 solid solution, i.e. cool feeling particles; not only effectively reduces the interface thermal resistance of the crystal grains, strengthens the cool feeling conduction, and can quickly conduct the heat absorbed by the human body on the fiber surface; but also refines the crystal grains, increases the heat conduction contact area, and effectively improves the composite core heat conduction efficiency.

[0027] (2) Construct a mesoporous SiO2+2-hydroxy-4-acrylate benzophenone hybrid shell to impart UV resistance to the fiber.

[0028] This application constructs an ordered mesoporous silica layer on the surface of cooling particles, which not only increases the loading of 2-hydroxy-4-acrylate benzophenone but also reduces thermal conductivity. The 2-hydroxy-4-acrylate benzophenone absorbs UVA and forms full-band protection with the UVB shielding of the core layer. The mesoporous silica shell is semi-transparent and does not affect the light scattering performance of the core layer.

[0029] (3) Constructing core-shell structured functional particles to impart water-washing resistance to fibers

[0030] This application modifies the surface of the mesoporous silica shell with KH570, so that 2-hydroxy-4-acrylate benzophenone is bonded to the mesoporous silica layer through molecular bonds, which avoids high-temperature degradation and water migration of 2-hydroxy-4-acrylate benzophenone, and improves structural stability; moreover, it improves the compatibility of the cooling and UV-resistant functional particles with polyester, improves the dispersion uniformity, and inhibits particle migration during water washing. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1; The preparation method of the cooling and UV-resistant functional particles includes the following steps:

[0033] S1: Add 30g zinc nitrate hexahydrate, 4g cerium nitrate hexahydrate, 12g urea, and 100mL deionized water while stirring (magnetic stirring at 500rpm for 30min). Control the temperature at 90℃ and stir for 9h. Filter, wash, dry, and calcine (350℃ for 2h) to obtain cool-feeling granules.

[0034] S2: Mix 10g of cooling particles, 50mL of anhydrous ethanol and 50mL of deionized water, heat to 50℃, add 1g of cetyltrimethylammonium bromide and disperse evenly, add 5mL of tetraethyl orthosilicate, adjust the pH of the solution to 9, heat to 60℃, keep the reaction at this temperature for 6h, centrifuge, wash and dry to obtain composite particles.

[0035] S3: Add 10g of composite particles, 50mL of deionized water, 50mL of anhydrous ethanol and 3g of KH570 to the reaction vessel and disperse evenly. Control the temperature at 60℃ and keep the reaction at this temperature for 1h. Centrifuge, wash and dry to obtain organic composite particles.

[0036] S4: In a nitrogen atmosphere, 10g of organic composite particles, 2g of 2-hydroxy-4-acrylate benzophenone, and 50mL of N,N-dimethylformamide were added to a reaction vessel for dispersion. 0.1g of azobisisobutyronitrile was added, and the temperature was controlled at 60℃ for 8h. After centrifugation, washing, and drying, cooling and UV-resistant functional particles were obtained.

[0037] Example 2; The preparation method of the cooling and UV-resistant functional particles includes the following steps:

[0038] S1: Add 30g zinc nitrate hexahydrate, 6g cerium nitrate hexahydrate, 15g urea, and 150mL deionized water while stirring (magnetic stirring at 500rpm for 30min). Control the temperature at 90℃ and stir for 12h. Filter, wash, dry, and calcine (350℃ for 2h) to obtain cool-feeling granules.

[0039] S2: Mix 10g of cooling granules, 100mL of anhydrous ethanol, and 50mL of deionized water, heat to 55℃, add 3g of cetyltrimethylammonium bromide and disperse evenly, add 7mL of tetraethyl orthosilicate, adjust the pH of the solution to 9, heat to 65℃, keep the reaction at this temperature for 7.5h, centrifuge, wash, and dry to obtain composite particles;

[0040] S3: Add 10g of composite particles, 100mL of deionized water, 100mL of anhydrous ethanol and 4.5g of KH570 to the reaction vessel and disperse evenly. Control the temperature at 65℃ and keep the reaction at this temperature for 1.5h. Centrifuge, wash and dry to obtain organic composite particles.

[0041] S4: In a nitrogen atmosphere, 10g of organic composite particles, 3.5g of 2-hydroxy-4-acrylate benzophenone, and 70mL of N,N-dimethylformamide were added to a reaction vessel for dispersion. 0.2g of azobisisobutyronitrile was added, and the temperature was controlled at 65℃ for 9h. After centrifugation, washing, and drying, cooling and UV-resistant functional particles were obtained.

[0042] Example 3; The preparation method of the cooling and UV-resistant functional particles includes the following steps:

[0043] S1: Add 30g zinc nitrate hexahydrate, 8g cerium nitrate hexahydrate, 18g urea, and 200mL deionized water while stirring (magnetic stirring at 500rpm for 30min). Control the temperature at 95℃ and stir for 12h. Filter, wash, dry, and calcine (350℃ for 2h) to obtain cool-feeling granules.

[0044] S2: Mix 10g of cooling particles, 100mL of anhydrous ethanol and 100mL of deionized water, heat to 60℃, add 5g of cetyltrimethylammonium bromide and disperse evenly, add 10mL of tetraethyl orthosilicate, adjust the pH of the solution to 10, heat to 70℃, keep the reaction at this temperature for 9h, centrifuge, wash and dry to obtain composite particles.

[0045] S3: Add 10g of composite particles, 100mL of deionized water, 100mL of anhydrous ethanol and 6g of KH570 to the reaction vessel and disperse evenly. Control the temperature at 70℃ and keep the reaction at this temperature for 2 hours. Centrifuge, wash and dry to obtain organic composite particles.

[0046] S4: In a nitrogen atmosphere, 10g of organic composite particles, 5g of 2-hydroxy-4-acrylate benzophenone, and 100mL of N,N-dimethylformamide were added to a reaction vessel for dispersion. 0.25g of azobisisobutyronitrile was added, and the temperature was controlled at 70℃ for 12h. After centrifugation, washing, and drying, cooling and UV-resistant functional particles were obtained.

[0047] Example 4; A method for preparing a cooling, UV-resistant bio-based polyester fiber, comprising the following steps:

[0048] A1: 15wt% of the cooling and UV-resistant functional particles prepared in Example 1 were melt-blended and granulated with 85wt% of bio-based polyester (purchased from Shell, fiber-grade PTT chips, grade 509201) at 270°C to obtain a cooling and UV-resistant masterbatch.

[0049] A2: 95wt% bio-based polyester chips (purchased from Shell, fiber-grade PTT chips, grade 509201) were added to a twin-screw extruder and melt-plasticized at 270℃. 5wt% cooling-feeling UV-resistant masterbatch was injected into the melting section of the twin-screw extruder and blended with the molten PTT. The blended material was then filtered through a screen by the screw and entered the spinning box at a spinning speed of 1200 m / min. The material was extruded through the spinneret orifices. The extruded filaments were air-cooled and cured in the spinning tunnel, and then oiled (the oiling agent was an emulsion containing antistatic agents and lubricants, with an oiling rate of 0.4%). Finally, the fibers were stretched on a stretching machine with a pre-stretch ratio of 1, a first stretch ratio of 3, and a second stretch ratio of 1.1, at a stretching temperature of 100℃, yielding cooling-feeling UV-resistant bio-based polyester fibers.

[0050] The above-prepared cooling and UV-resistant bio-based polyester fiber was spun into a product with a unit mass of 155 g / m. 2 The fabric.

[0051] Example 5: A method for preparing a cooling and UV-resistant bio-based polyester fiber. Compared with Example 4, the only difference is that the cooling and UV-resistant functional particles prepared in Example 1 are replaced in equal amounts with the cooling and UV-resistant functional particles prepared in Example 2. The remaining components are completely consistent with the preparation method.

[0052] Example 6: A method for preparing a cooling and UV-resistant bio-based polyester fiber. Compared with Example 4, the only difference is that the cooling and UV-resistant functional particles prepared in Example 1 are replaced in equal amounts with the cooling and UV-resistant functional particles prepared in Example 3. The remaining components are completely consistent with the preparation method.

[0053] Comparative Example 1

[0054] The preparation method of cooling and UV-protective functional particles includes the following steps:

[0055] S1: Add 30g zinc nitrate hexahydrate, 15g urea, and 150mL deionized water while stirring (magnetic stirring at 500rpm for 30min). Control the temperature at 90℃ and stir for 12h. Filter, wash, dry, and calcine (350℃ for 2h) to obtain cool-feeling granules.

[0056] S2: Mix 10g of cooling granules, 100mL of anhydrous ethanol, and 50mL of deionized water, heat to 55℃, add 3g of cetyltrimethylammonium bromide and disperse evenly, add 7mL of tetraethyl orthosilicate, adjust the pH of the solution to 9, heat to 65℃, keep the reaction at this temperature for 7.5h, centrifuge, wash, and dry to obtain composite particles;

[0057] S3: Add 10g of composite particles, 100mL of deionized water, 100mL of anhydrous ethanol and 4.5g of KH570 to the reaction vessel and disperse evenly. Control the temperature at 65℃ and keep the reaction at this temperature for 1.5h. Centrifuge, wash and dry to obtain organic composite particles.

[0058] S4: In a nitrogen atmosphere, 10g of organic composite particles, 3.5g of 2-hydroxy-4-acrylate benzophenone, and 70mL of N,N-dimethylformamide were added to a reaction vessel for dispersion. 0.2g of azobisisobutyronitrile was added, and the temperature was controlled at 65℃ for 9h. After centrifugation, washing, and drying, cooling and UV-resistant functional particles were obtained.

[0059] Comparative Example 2

[0060] The preparation method of cooling and UV-protective functional particles includes the following steps:

[0061] S1: Add 30g zinc nitrate hexahydrate, 6g cerium nitrate hexahydrate, 15g urea, and 150mL deionized water while stirring (magnetic stirring at 500rpm for 30min). Control the temperature at 90℃ and stir for 12h. Filter, wash, dry, and calcine (350℃ for 2h) to obtain cool-feeling granules.

[0062] S2: Add 10g of cooling particles, 100mL of deionized water, 100mL of anhydrous ethanol and 4.5g of KH570 to the reaction vessel and disperse evenly. Control the temperature at 65℃ and keep the reaction at this temperature for 1.5h. Centrifuge, wash and dry to obtain organic composite particles.

[0063] S3: In a nitrogen atmosphere, 10g of organic composite particles, 3.5g of 2-hydroxy-4-acrylate benzophenone, and 70mL of N,N-dimethylformamide were added to a reaction vessel for dispersion. 0.2g of azobisisobutyronitrile was added, and the temperature was controlled at 65℃ for 9h. After centrifugation, washing, and drying, cooling and UV-resistant functional particles were obtained.

[0064] Comparative Example 3

[0065] The preparation method of cooling and UV-protective functional particles includes the following steps:

[0066] S1: Add 30g zinc nitrate hexahydrate, 6g cerium nitrate hexahydrate, 15g urea, and 150mL deionized water while stirring (magnetic stirring at 500rpm for 30min). Control the temperature at 90℃ and stir for 12h. Filter, wash, dry, and calcine (350℃ for 2h) to obtain cool-feeling granules.

[0067] S2: Mix 10g of cooling granules, 100mL of anhydrous ethanol and 50mL of deionized water, heat to 55℃, add 7mL of tetraethyl orthosilicate, adjust the pH of the solution to 9, heat to 65℃, keep the reaction at this temperature for 7.5h, centrifuge, wash and dry to obtain composite particles.

[0068] S3: Add 10g of composite particles, 100mL of deionized water, 100mL of anhydrous ethanol and 4.5g of KH570 to the reaction vessel and disperse evenly. Control the temperature at 65℃ and keep the reaction at this temperature for 1.5h. Centrifuge, wash and dry to obtain organic composite particles.

[0069] S4: In a nitrogen atmosphere, 10g of organic composite particles, 3.5g of 2-hydroxy-4-acrylate benzophenone, and 70mL of N,N-dimethylformamide were added to a reaction vessel for dispersion. 0.2g of azobisisobutyronitrile was added, and the temperature was controlled at 65℃ for 9h. After centrifugation, washing, and drying, cooling and UV-resistant functional particles were obtained.

[0070] Comparative Example 4

[0071] The preparation method of cooling and UV-protective functional particles includes the following steps:

[0072] S1: Add 30g zinc nitrate hexahydrate, 6g cerium nitrate hexahydrate, 15g urea, and 150mL deionized water while stirring (magnetic stirring at 500rpm for 30min). Control the temperature at 90℃ and stir for 12h. Filter, wash, dry, and calcine (350℃ for 2h) to obtain cool-feeling granules.

[0073] S2: Mix 10g of cooling granules, 100mL of anhydrous ethanol, and 50mL of deionized water, heat to 55℃, add 3g of cetyltrimethylammonium bromide and disperse evenly, add 7mL of tetraethyl orthosilicate, adjust the pH of the solution to 9, heat to 65℃, keep the reaction at this temperature for 7.5h, centrifuge, wash, and dry to obtain composite particles;

[0074] S3: 10g of composite particles and 3.5g of 2-hydroxy-4-acrylate benzophenone were blended to obtain cooling and UV-resistant functional particles.

[0075] Comparative Example 5

[0076] A method for preparing a cooling and UV-resistant bio-based polyester fiber, compared with Example 4, is that the cooling and UV-resistant functional particles prepared in Example 1 are replaced in equal amounts with the cooling and UV-resistant functional particles prepared in Comparative Example 1, and the remaining components are completely consistent with the preparation method.

[0077] Comparative Example 6

[0078] A method for preparing a cooling and UV-resistant bio-based polyester fiber, compared with Example 4, is that the cooling and UV-resistant functional particles prepared in Example 1 are replaced in equal amounts with the cooling and UV-resistant functional particles prepared in Comparative Example 2, and the remaining components are completely consistent with the preparation method.

[0079] Comparative Example 7

[0080] A method for preparing a cooling and UV-resistant bio-based polyester fiber, compared with Example 4, is that the cooling and UV-resistant functional particles prepared in Example 1 are replaced in equal amounts with the cooling and UV-resistant functional particles prepared in Comparative Example 3, and the remaining components are completely consistent with the preparation method.

[0081] Comparative Example 8

[0082] A method for preparing a cooling and UV-resistant bio-based polyester fiber, compared with Example 4, is that the cooling and UV-resistant functional particles prepared in Example 1 are replaced in equal amounts with the cooling and UV-resistant functional particles prepared in Comparative Example 4, and the remaining components are completely consistent with the preparation method.

[0083] Performance testing

[0084] (1) UV protection performance: UV protection performance was tested according to GB / T 18830-2009 "Evaluation of UV protection performance of textiles", and the test results are shown in Table 1;

[0085] (2) Cooling performance upon contact: The test was conducted according to GB / T 35263-2017 "Test and evaluation of instantaneous cooling performance of textiles upon contact". The test conditions were: 20.0℃, 65.0%, hot plate temperature: 35.0℃, cold plate temperature: 20.0℃. The test results are shown in Table 1.

[0086] Table 1: Statistical Table of Cooling and UV Protection Performance Test Data for Examples 4-6 and Comparative Examples 5-8

[0087]

[0088] As shown in Table 1, the experimental data show that the fabrics prepared in Examples 4-6 have excellent UV protection properties, with UPF values ​​all above 70, UVA transmittance below 2.5, and UVB transmittance below 1.25; they are significantly better than the fabrics in Comparative Examples 5-8, demonstrating excellent UV protection properties.

[0089] The fabrics prepared in Examples 4-6 have excellent thermal conductivity and cooling properties, with a contact cooling coefficient higher than 0.4 J / (cm·s), while the comparative examples are generally lower than 0.4 J / (cm·s), indicating that the cooling properties of the examples are significant.

[0090] (3) The tested fabric was washed and hung to dry in accordance with GB / T 8629-2017, 4N program, and repeated 20 times. The contact cooling performance and UV protection performance were tested, and the UPF retention rate and contact cooling coefficient retention rate were calculated after 20 washes. The test results are shown in Table 2.

[0091] Table 2: Statistical Table of Water Wash Resistance Test Data for Examples 4-6 and Comparative Examples 5-8

[0092]

[0093] As shown in Table 2, the fabric prepared in the embodiments of this application retains a contact cooling coefficient of over 95% and a UPF of over 90% after 20 washes. This indicates that the fabric prepared in the embodiments of this application maintains good cooling performance and UV protection performance even after multiple washes in actual application. In contrast, the fabrics prepared in Comparative Examples 5-8 show a significant decrease in cooling performance and UV protection performance after washing.

[0094] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A cooling, UV-resistant bio-based polyester fiber, characterized in that, The preparation method of the cooling and UV-resistant bio-based polyester fiber includes the following steps: melt spinning the cooling and UV-resistant masterbatch and bio-based polyester chips to obtain the cooling and UV-resistant bio-based polyester fiber. The cooling and UV-resistant masterbatch is obtained by melt blending and granulation of cooling and UV-resistant functional particles and bio-based polyester; The cooling and UV-resistant functional particles are core-shell particles with a cooling particle core and a surface-deposited mesoporous silica-UV-resistant hybrid shell. The preparation method of the cooling and UV-resistant functional particles includes the following steps: S1: Mix cooling particles, anhydrous ethanol, and deionized water, heat to 50-60℃, add hexadecyltrimethylammonium bromide and disperse evenly, add tetraethyl orthosilicate, adjust the pH of the solution to 9-10, heat to 60-70℃, keep the reaction at this temperature for 6-9 hours, centrifuge, wash, and dry to obtain composite particles; S2: Add the composite particles, deionized water, anhydrous ethanol, and KH570 to the reaction vessel and disperse them evenly. Control the temperature at 60-70℃ and keep the reaction at this temperature for 1-2 hours. Centrifuge, wash, and dry to obtain the organic composite particles. S3: In a nitrogen atmosphere, organic composite particles, 2-hydroxy-4-acrylate benzophenone, and N,N-dimethylformamide are added to a reaction vessel and dispersed. Azobisisobutyronitrile is added, and the temperature is controlled at 60-70℃. The reaction is kept at this temperature for 8-12 hours. After centrifugation, washing, and drying, cooling and UV-resistant functional particles are obtained. The preparation method of the cooling granules includes the following steps: zinc nitrate hexahydrate, cerium nitrate hexahydrate, urea, and deionized water are mixed, the temperature is controlled at 90-95℃, the mixture is stirred and reacted for 9-12 hours, and then filtered, washed, dried, and calcined to obtain cooling granules.

2. The cooling, UV-resistant bio-based polyester fiber according to claim 1, characterized in that, Cooling and UV-resistant bio-based polyester fibers contain 1-5 wt% cooling and UV-resistant masterbatch.

3. The cooling, UV-resistant bio-based polyester fiber according to claim 1, characterized in that, Cooling and UV-resistant masterbatch contains 10-20 wt% cooling and UV-resistant functional particles.

4. The cooling, UV-resistant bio-based polyester fiber according to claim 1, characterized in that, The addition ratio of cooling granules, anhydrous ethanol, deionized water, hexadecyltrimethylammonium bromide, and tetraethyl orthosilicate in S1 is 10g: 50-100mL: 50-100mL: 1-5g: 5-10mL.

5. The cooling, UV-resistant bio-based polyester fiber according to claim 1, characterized in that, The addition ratio of composite particles, deionized water, anhydrous ethanol, and KH570 in S2 is 10g: 50-100mL: 50-100mL: 3-6g.

6. The cooling, UV-resistant bio-based polyester fiber according to claim 1, characterized in that, The addition ratio of organic composite particles, 2-hydroxy-4-acrylate benzophenone, N,N-dimethylformamide, and azobisisobutyronitrile in S3 is 10g: 2-5g: 50-100mL: 0.1-0.25g.

7. The cooling, UV-resistant bio-based polyester fiber according to claim 1, characterized in that, The addition ratio of zinc nitrate hexahydrate, cerium nitrate hexahydrate, urea, and deionized water is 30g: 4-8g: 12-18g: 100-200mL.

8. The application of the cooling and UV-resistant bio-based polyester fiber as described in any one of claims 1-7 in fabrics.

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