Low-odor polyester staple fiber and preparation method thereof

Abstract

The invention relates to the technical field of functional polyester staple fibers, in particular to a low-odor polyester staple fiber and a preparation method thereof. The invention relates to a low-odor polyester staple fiber. The low-odor polyester staple fiber is a polyester staple fiber loaded with ZnO / ZnFe2O4. The low-odor polyester staple fiber can effectively adsorb peculiar smell gas, has an excellent antibacterial effect, and still has extremely low odor after production and long-time use.

Description

Technical Field

[0001] The present application relates to the technical field of functionalized polyester staple fibers, and more specifically, to low-odor polyester staple fibers and a preparation method thereof. Background Art

[0002] Polyester, also known as polyester fiber, is a synthetic fiber made from organic dibasic acids and diols through chemical condensation. It is widely used in various textiles and industrial products. It has the advantages of high strength, wear resistance, corrosion resistance, good elasticity, wrinkle resistance and bright colors. Therefore, it is widely used in civil and industrial fields.

[0003] Among them, after dyeing and textile processing, polyester staple fibers can be made into various home decoration products, such as carpets, sofa fabrics, etc. However, the presence of additives in polyester production can easily produce odors, and for the comfort of home, people usually walk barefoot on carpets or sofa fabrics, which makes it easy for human metabolites such as sweat to remain on carpets or sofa fabrics. Sweat can also easily produce odors under the action of microorganisms, thus affecting the normal use of carpets or sofa fabrics. Summary of the invention

[0004] In order to improve the defects of conventional polyester staple fibers, such as odor and easy microbial reproduction after long-term use, the present application provides a low-odor polyester staple fiber and a preparation method thereof.

[0005] In the first aspect, the present application provides a low-odor polyester staple fiber, which adopts the following technical solution: A low-odor polyester staple fiber, wherein the low-odor polyester staple fiber is a polyester staple fiber loaded with ZnO / ZnFe2O4.

[0006] ZnO / ZnFe2O4 is a porous and high specific surface area metal organic framework heterostructure with a regular cubic morphology and a size of about 1-2μm. The interior of the cubic particles is hollow and the outer wall is a porous structure. Therefore, it has excellent adsorption effects on gases such as benzene, toluene, ammonia, formaldehyde, and acetone, thereby adsorbing the additive odor generated by polyester itself and the microbial growth odor generated by the long-term use of polyester, thereby making the polyester have a lower odor or even no odor.

[0007] In addition, ZnO / ZnFe2O4 also contains a large amount of Zn ions, which can bind to the negative charge on the bacterial cell membrane, change the structure and permeability of the membrane, and thus cause the bacterial cell membrane to rupture, causing the bacteria to lose their normal functions. Moreover, Zn ions can also interfere with the activity of key enzymes in bacteria, thereby inhibiting the growth and reproduction of bacteria. Zn ions can induce oxidative stress in bacteria, leading to oxidative damage to cells and further destroying bacterial biomolecules. Zn ions can also regulate bacterial gene expression, interfering with their growth and reaction. In summary, ZnO / ZnFe2O4 can also inhibit the growth and reproduction of microorganisms, thereby inhibiting the generation of microbial reproduction odor at the root.

[0008] Preferably, TiO2 is compounded on ZnO / ZnFe2O4.

[0009] Preferably, the operation steps of the ZnO / ZnFe2O4 composite TiO2 are: dispersing ZnO / ZnFe2O4 in excess methanol, then adding TiO2 and continuously stirring to make it evenly mixed, and then drying the resulting solution at a temperature of 80-100°C for 10-14h to finally obtain a ZnO / ZnFe2O4@TiO2 composite material.

[0010] Although ZnO / ZnFe2O4 can adsorb gases such as benzene, toluene, ammonia, formaldehyde, and acetone, the above gases will not be eliminated or degraded. As a result, after the polyester staple fiber is used for a long time, the odorous gas will still escape and emit.

[0011] TiO2 can oxidize and decompose odor pollutants into harmless and odorless small molecules. Specifically, after being excited by light, the electrons in TiO2 cross the forbidden band from the valence band and migrate to the conduction band, generating electron-hole pairs. The photogenerated electrons reduce the original electron acceptors (O2), and the photogenerated holes oxidize the electron donors (odorous gases) to form hydroxyl radicals and superoxide radicals with strong oxidizing properties, thereby degrading odor pollutants into harmless small molecules such as CO2 or H2O.

[0012] In addition, compared with simply blending ZnO / ZnFe2O4 and TiO2, the present application prepares the two to form a ZnO / ZnFe2O4@TiO2 composite material, so that ZnO / ZnFe2O4 and TiO2 are loaded on the surface of polyester staple fibers as a whole. When ZnO / ZnFe2O4 adsorbs odorous gases, TiO2 can degrade odorous gases in time, thereby obtaining a better odor treatment effect.

[0013] Preferably, the mass ratio of ZnO / ZnFe2O4 to TiO2 is (2-4):1.

[0014] When ZnO / ZnFe2O4 and TiO2 adopt the above mass ratio, the prepared ZnO / ZnFe2O4@TiO2 composite material will have a better odor gas treatment effect.

[0015] Preferably, the ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and an impregnation process.

[0016] Preferably, the impregnation process of the ZnO / ZnFe2O4@TiO2 composite material comprises the following steps: Preparation of ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion: Disperse the ZnO / ZnFe2O4@TiO2 composite material in pure water at an addition amount of 1% to 2%, and continue stirring until stable to obtain a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion; Polyester fiber pretreatment: Under stirring conditions at 40-60°C, the polyester fiber is immersed in an aqueous solution of surfactant 9801, the concentration of surfactant 9801 is 2-4g / L, the immersion time is 20-40min, and finally washed and dried to obtain pretreated polyester fiber; Dyeing loading: The pretreated polyester fiber was immersed in the ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion at a mass ratio of 1: (40-50), and then slowly heated from room temperature to 90-100°C at a rate of 2-4°C / min, and then heated to 120-140°C at a rate of 1-2°C / min, and then kept warm for 20-40 minutes, and finally cooled to room temperature, and finally immersed in a surfactant 9801 aqueous solution, washed at 40-60°C for 10-16 minutes, and finally washed and dried to obtain polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material.

[0017] Although the ZnO / ZnFe2O4@TiO2 composite material can degrade odorous gases while adsorbing them, the ZnO / ZnFe2O4@TiO2 composite material has a poor connection with polyester fibers. After long-term use, the ZnO / ZnFe2O4@TiO2 composite material can easily separate from the polyester fibers, thereby affecting its odor adsorption and degradation effect.

[0018] When the ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and a dyeing process, the ZnO / ZnFe2O4@TiO2 composite material will be firmly attached to the surface of the polyester, and the polyester fiber can also resist high-temperature washing. That is to say, when the ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and a dyeing process, the prepared polyester fiber will have more lasting odor absorption and odor degradation properties.

[0019] Preferably, the ZnO / ZnFe2O4 comprises the following raw materials in parts by mass: 3-4 parts of zinc nitrate, 0.5-0.8 parts of NH2-BDC, 12-16 parts of PVP and 4-5 parts of Fe(acac)3.

[0020] Preferably, the preparation method of ZnO / ZnFe2O4 is: At room temperature, zinc nitrate, NH2-BDC, PVP and Fe(acac)3 are added in sequence to a mixed solution of 480 ml of DMF and ethanol, with a mass ratio of DMF to ethanol of 5:3. The mixture is stirred until completely dissolved, and then reacted at 90-110°C for 5-10 hours. The mixture is then washed with ethanol, dried, and calcined at 500-600°C for 1-3 hours to obtain ZnO / ZnFe2O4.

[0021] In a second aspect, the present application provides a method for preparing low-odor polyester staple fibers, using the following technical solution: A method for preparing low-odor polyester staple fibers comprises the following steps: S1. At room temperature, zinc nitrate, NH2-BDC, PVP and Fe(acac)3 are added to a mixed solution of 480 ml DMF and ethanol in a mass ratio of 5:3, and stirred until completely dissolved. Then, the mixture is reacted at 90-110°C for 5-10 hours, washed with ethanol, dried, and calcined at 500-600°C for 1-3 hours to obtain ZnO / ZnFe2O4. S2, dispersing ZnO / ZnFe2O4 in excess methanol, then adding TiO2 and stirring continuously to make it uniformly mixed, and then drying the resulting solution at a temperature of 80-100°C for 10-14h to finally obtain a ZnO / ZnFe2O4@TiO2 composite material; S3, dispersing the ZnO / ZnFe2O4@TiO2 composite material in pure water at an addition amount of 1% to 2%, and continuously stirring until stable to obtain a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion; S4, soaking the polyester fiber in an aqueous solution of surfactant 9801 at a temperature of 40-60° C. under stirring, wherein the concentration of surfactant 9801 is 2-4 g / L, and the soaking time is 20-40 min, and finally washing and drying to obtain pretreated polyester fiber; S5, immersing the pretreated polyester fiber in a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion at a mass ratio of 1: (40-50), then slowly heating from room temperature to 90-100°C at a rate of 2-4°C / min, and then heating to 120-140°C at a rate of 1-2°C / min, and then keeping warm for 20-40 minutes, and finally cooling to room temperature, and finally immersing in a surfactant 9801 aqueous solution, washing at 40-60°C for 10-16 minutes, and finally washing and drying to obtain polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material; S6. Cut the polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material to a length of 35 mm to obtain low-odor polyester staple fibers.

[0022] In summary, this application has the following beneficial effects: 1. ZnO / ZnFe2O4 is a porous and high specific surface area metal organic framework heterogeneous structure. It has a regular cubic morphology and a size of about 1-2μm. The interior of the cubic particles is hollow and the outer wall is a porous structure. Therefore, it has excellent adsorption effect on gases such as benzene, toluene, ammonia, formaldehyde, acetone, etc., thereby adsorbing the additive odor generated by polyester itself and the microbial growth odor generated by long-term use of polyester, thereby making the odor of polyester lower or even odorless; In addition, since ZnO / ZnFe2O4 also contains a large amount of Zn ions, Zn ions can combine with the negative charge on the bacterial cell membrane, change the structure and permeability of the membrane, thereby causing the bacterial cell membrane to rupture and causing the bacteria to lose their normal functions. Moreover, Zn ions can also interfere with the activity of key enzymes in bacteria, thereby inhibiting the growth and reproduction of bacteria. Zn ions can induce oxidative stress in bacteria, leading to oxidative damage to cells and further destroying bacterial biomolecules. Zn ions can also regulate bacterial gene expression and interfere with their growth and reaction. In summary, ZnO / ZnFe2O4 can also inhibit the growth and reproduction of microorganisms, thereby inhibiting the generation of microbial reproduction odor at the root.

[0023] 2. TiO2 can oxidize and decompose odor pollutants into harmless and odorless small molecules. Specifically, after being excited by light, the electrons in TiO2 cross the forbidden band from the valence band and migrate to the conduction band, generating electron-hole pairs. The photogenerated electrons reduce the original electron acceptors (O2), and the photogenerated holes oxidize the electron donors (odorous gases) to form hydroxyl radicals and superoxide radicals with strong oxidizing properties, thereby degrading odor pollutants into harmless small molecules such as CO2 or H2O.

[0024] 3. Compared with simply blending ZnO / ZnFe2O4 and TiO2, the present application prepares the two to form a ZnO / ZnFe2O4@TiO2 composite material, thereby loading ZnO / ZnFe2O4 and TiO2 as a whole on the surface of polyester staple fibers. While ZnO / ZnFe2O4 adsorbs odorous gases, TiO2 can degrade odorous gases in a timely manner, thereby obtaining a better odor treatment effect.

[0025] 4. The connection effect between ZnO / ZnFe2O4@TiO2 composite material and polyester fiber is not good. After long-term use, ZnO / ZnFe2O4@TiO2 composite material is easy to separate from polyester fiber, thus affecting its odor adsorption and degradation effect; When the ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and a dyeing process, the ZnO / ZnFe2O4@TiO2 composite material will be firmly attached to the surface of the polyester, and the polyester fiber can also resist high-temperature washing. That is to say, when the ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and a dyeing process, the prepared polyester fiber will have more lasting odor absorption and odor degradation properties. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with Examples 1-8 and Comparative Example 1.

[0027] raw material

[0028] Polyester fiber Qingdao Xinwei; Zinc nitrate CAS: 7779-88-6; NH2-BDC CAS: 10312-55-7; PVPCAS: 9003-39-8; Fe(acac)3CAS: 14024-18-1; DMF CAS: 68-12-2; Ethanol CAS: 64-17-5; Methanol CAS: 67-56-1; TiO2CAS: 13463-67-7; Surfactant 9801 Haian Petrochemical. Example

[0029] Example 1

[0030] A low-odor polyester staple fiber, which is a polyester staple fiber loaded with ZnO / ZnFe2O4@TiO2.

[0031] The method for preparing low-odor polyester staple fibers comprises the following steps: S1. At room temperature, 3.34 g zinc nitrate, 0.68 g NH2-BDC, 14.2 g PVP and 4.32 g Fe(acac)3 were added to a mixed solution of 480 ml DMF and ethanol in a mass ratio of 5:3. The mixture was stirred until completely dissolved, and then reacted at 100 °C for 8 h. The mixture was then washed with ethanol, dried and calcined at 550 °C for 2 h to obtain ZnO / ZnFe2O4. S2, dispersing ZnO / ZnFe2O4 in excess methanol, then adding TiO2 and stirring continuously to make it uniformly mixed, the mass ratio of ZnO / ZnFe2O4 to TiO2 is 3:1, and then drying the obtained solution at a temperature of 90°C for 12h, and finally obtaining a ZnO / ZnFe2O4@TiO2 composite material; S3, dispersing the ZnO / ZnFe2O4@TiO2 composite material in pure water at an addition amount of 1.5%, and continuously stirring until stable to obtain a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion; S4, soaking the polyester fiber in an aqueous solution of surfactant 9801 at 50° C. under stirring conditions, wherein the concentration of surfactant 9801 is 3 g / L, the soaking time is 30 min, and finally washing and drying are performed to obtain pretreated polyester fiber; S5, immersing the pretreated polyester fiber in a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion at a mass ratio of 1:50, then slowly heating from room temperature to 90-100°C at a rate of 3°C / min, and then heating to 130°C at a rate of 2°C / min, and then keeping warm for 30 minutes, and finally cooling to room temperature, and finally immersing in a surfactant 9801 aqueous solution, the concentration of surfactant 9801 is 3g / L, washing at 50°C for 14 minutes, and finally washing and drying to obtain polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material; S6. Cut the polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material to a length of 35 mm to obtain low-odor polyester staple fibers.

[0032] Example 2-3 The difference from Example 1 is that the mass ratio of ZnO / ZnFe2O4 to TiO2 is different, as shown in Table 1.

[0033] Table 1 The mass ratio of ZnO / ZnFe2O4 to TiO2 in Examples 1-3 Example 1 Example 2 Example 3 <![CDATA[ZnO / ZnFe2O4]]> 3 2 4 <![CDATA[TiO2]]> 1 1 1 Example 4

[0034] The difference from Example 1 is that in S2, ZnO / ZnFe2O4 and TiO2 are directly mixed.

[0035] Example 5

[0036] The difference from Example 1 is that TiO2 is no longer added to ZnO / ZnFe2O4@TiO2.

[0037] Embodiment 6-7 The difference from Example 1 is that the addition amounts of the various components of ZnO / ZnFe2O4 are different, as shown in Table 2.

[0038] Table 2 Addition amount of each component of ZnO / ZnFe2O4 in Example 1 and Examples 6-7 / g Example 1 Example 6 Example 7 Zinc nitrate 3.34 3 4 <![CDATA[NH2-BDC]]> 0.68 0.8 0.5 PVP 14.2 12 16 <![CDATA[Fe(acac)3]]> 4.32 5 4 Example 8

[0039] The difference from Example 1 is that in S4-S5, the surfactant 9801 aqueous solution is no longer used.

[0040] Comparative Example

[0041] Comparative Example 1 A polyester staple fiber is obtained by directly cutting polyester fibers, and the cutting length is 35 mm.

[0042] Performance testing Detection Methods

[0043] 1. Odor removal performance test Examples 1-8 and Comparative Example 1 were all prepared into blankets, which were then cut into samples of 10 cm×10 cm. Three pieces were cut out for each example.

[0044] Then, the samples of Examples 1-8 and Comparative Example 1 were placed in 9 vacuum boxes, each with a volume of 1 m 3 Then fill the vacuum box with ammonia, and continuously detect the ammonia concentration in the vacuum box with the ammonia detector HR100L-NH3-W. Stop filling ammonia when the ammonia concentration reaches 100ppm. After that, let it stand for 24 hours, and measure the concentration in the vacuum box again to calculate the adsorption percentage, which is (1-current ammonia concentration / original ammonia concentration)*100%, and take the average value.

[0045] The test was performed three times and the average value was taken.

[0046] The test data are shown in Table 3.

[0047] Table 3 Deodorization performance of Examples 1-8 and Comparative Example 1 Ammonia adsorption percentage / % Ammonia adsorption percentage / % Example 1 93.7% Example 6 91.5% Example 2 88.9% Example 7 92.1% Example 3 91.0% Example 8 63.3% Example 4 80.2% Comparative Example 1 8.9% Example 5 74.6% With reference to Example 1 and Comparative Example 1 and in combination with Table 3, it can be seen that, relative to Comparative Example 1, the ammonia adsorption percentage of Example 1 is significantly improved, which indicates that the low-odor polyester staple fiber of the present application has a good adsorption and degradation effect on odorous gases.

[0048] Referring to Examples 1-3 and in combination with Table 3, it can be seen that, relative to Example 1, the ammonia adsorption percentages of Examples 2-3 are significantly reduced, which indicates that when the mass ratio of ZnO / ZnFe2O4 and TiO2 is the same as that of Example 1, the prepared ZnO / ZnFe2O4@TiO2 composite material will enable the polyester fiber to have a better odor gas adsorption effect.

[0049] With reference to Example 1 and Examples 4-5 and in combination with Table 3, it can be seen that the ammonia adsorption percentage of Example 4 is significantly reduced compared with that of Example 1. This indicates that, compared with directly mixing ZnO / ZnFe2O4 and TiO2, preparing ZnO / ZnFe2O4 and TiO2 into a ZnO / ZnFe2O4@TiO2 composite material can further enhance the adsorption and degradation effect of odorous gases of low-odor polyester staple fibers.

[0050] The reason is that, compared with simply blending ZnO / ZnFe2O4 and TiO2, the present application prepares the two to form a ZnO / ZnFe2O4@TiO2 composite material, so that ZnO / ZnFe2O4 and TiO2 are loaded on the surface of polyester staple fibers as a whole. Therefore, while ZnO / ZnFe2O4 adsorbs odorous gases, TiO2 can degrade odorous gases in time, thereby obtaining a better odor treatment effect.

[0051] Compared with Example 4, the ammonia adsorption percentage of Example 5 is further reduced, which shows that the addition of TiO2 can further improve the odor gas adsorption and degradation effect of the low-odor polyester staple fiber.

[0052] The reason is that TiO2 can oxidize and decompose odor pollutants into harmless and odorless small molecules. Specifically, after being excited by light, the electrons in TiO2 cross the forbidden band from the valence band and migrate to the conduction band, generating electron-hole pairs. The photogenerated electrons reduce the original electron acceptors (O2), and the photogenerated holes oxidize the electron donors (odorous gases) to form hydroxyl radicals and superoxide radicals with strong oxidizing properties, thereby degrading odor pollutants into harmless small molecules such as CO2 or H2O.

[0053] At the same time, compared with comparative example 1, the ammonia adsorption percentage of embodiment 5 is still relatively higher, which shows that ZnO / ZnFe2O4 itself has a very good odor gas adsorption and degradation effect.

[0054] The reason is that ZnO / ZnFe2O4 is a porous and high specific surface area metal organic framework heterostructure with a regular cubic morphology and a size of about 1-2μm. The interior of the cubic particles is hollow and the outer wall is a porous structure. Therefore, it has excellent adsorption effects on gases such as benzene, toluene, ammonia, formaldehyde, and acetone, thereby adsorbing the additive odor generated by polyester itself and the microbial growth odor generated by the long-term use of polyester, thereby making the polyester have lower odor or even no odor.

[0055] In addition, ZnO / ZnFe2O4 also contains a large amount of Zn ions, which can bind to the negative charge on the bacterial cell membrane, change the structure and permeability of the membrane, and thus cause the bacterial cell membrane to rupture, causing the bacteria to lose their normal functions. Moreover, Zn ions can also interfere with the activity of key enzymes in bacteria, thereby inhibiting the growth and reproduction of bacteria. Zn ions can induce oxidative stress in bacteria, leading to oxidative damage to cells and further destroying bacterial biomolecules. Zn ions can also regulate bacterial gene expression, interfering with their growth and reaction. In summary, ZnO / ZnFe2O4 can also inhibit the growth and reproduction of microorganisms, thereby inhibiting the generation of microbial reproduction odor at the root.

[0056] With reference to Example 1 and Examples 6-7 and in combination with Table 3, it can be seen that the ammonia adsorption percentage of Examples 6-7 is slightly lower than that of Example 1, which indicates that when the components of ZnO / ZnFe2O4 are formulated in the same proportion as in Example 1, the low-odor polyester staple fiber prepared will have a better odor gas adsorption and degradation effect.

[0057] With reference to Example 1 and Example 8 and in combination with Table 3, it can be seen that the ammonia adsorption percentage of Example 8 is significantly reduced compared with that of Example 1, which indicates that the addition of surfactant 9801 aqueous solution can significantly enhance the adsorption and degradation effect of odorous gases of low-odor polyester staple fibers.

[0058] The reason is that the ZnO / ZnFe2O4@TiO2 composite material has poor connection with polyester fiber. After long-term use, the ZnO / ZnFe2O4@TiO2 composite material can easily separate from the polyester fiber, thus affecting its odor adsorption and degradation effect.

[0059] When the ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and a dyeing process, the ZnO / ZnFe2O4@TiO2 composite material will be firmly attached to the surface of the polyester, and the polyester fiber can also resist high-temperature washing. That is to say, when the ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and a dyeing process, the prepared polyester fiber will have more lasting odor absorption and odor degradation properties.

[0060] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A low-odor polyester staple fiber, characterized in that: The low-odor polyester staple fiber is a polyester staple fiber loaded with ZnO / ZnFe2O4.

2. The low-odor polyester staple fiber according to claim 1, characterized in that: TiO2 is also compounded on the ZnO / ZnFe2O4.

3. The low-odor polyester staple fiber according to claim 2, characterized in that: The operation steps of the ZnO / ZnFe2O4 composite TiO2 are: dispersing ZnO / ZnFe2O4 in excess methanol, then adding TiO2 and stirring continuously to make it evenly mixed, and then drying the resulting solution at a temperature of 80-100°C for 10-14h to finally obtain a ZnO / ZnFe2O4@TiO2 composite material.

4. The low-odor polyester staple fiber according to claim 3, characterized in that: The mass ratio of ZnO / ZnFe2O4 to TiO2 is (2-4):

1.

5. The low-odor polyester staple fiber according to claim 2, characterized in that: The ZnO / ZnFe2O4@TiO2 composite material is loaded on the surface of the polyester fiber through a surfactant and an impregnation process.

6. The low-odor polyester staple fiber according to claim 5, characterized in that: The impregnation process of the ZnO / ZnFe2O4@TiO2 composite material comprises the following steps: Preparation of ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion: Disperse the ZnO / ZnFe2O4@TiO2 composite material in pure water at an addition amount of 1% to 2%, and continue stirring until stable to obtain a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion; Polyester fiber pretreatment: Under stirring conditions at 40-60°C, the polyester fiber is immersed in an aqueous solution of surfactant 9801, the concentration of surfactant 9801 is 2-4g / L, the immersion time is 20-40min, and finally washed and dried to obtain pretreated polyester fiber; Dyeing loading: The pretreated polyester fiber was immersed in the ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion at a mass ratio of 1: (40-50), and then slowly heated from room temperature to 90-100°C at a rate of 2-4°C / min, and then heated to 120-140°C at a rate of 1-2°C / min, and then kept warm for 20-40 minutes, and finally cooled to room temperature, and finally immersed in a surfactant 9801 aqueous solution, washed at 40-60°C for 10-16 minutes, and finally washed and dried to obtain polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material.

7. The low-odor polyester staple fiber according to claim 1, characterized in that: The ZnO / ZnFe2O4 comprises the following raw materials in parts by weight: 3-4 parts of zinc nitrate, 0.5-0.8 parts of NH2-BDC, 12-16 parts of PVP and 4-5 parts of Fe(acac)3.

8. The low-odor polyester staple fiber according to claim 7, characterized in that: The preparation method of the ZnO / ZnFe2O4 is: At room temperature, zinc nitrate, NH2-BDC, PVP and Fe(acac)3 are added in sequence to a mixed solution of 480 ml of DMF and ethanol, with a mass ratio of DMF to ethanol of 5:

3. The mixture is stirred until completely dissolved, and then reacted at 90-110°C for 5-10 hours. The mixture is then washed with ethanol, dried, and calcined at 500-600°C for 1-3 hours to obtain ZnO / ZnFe2O4.

9. A low-odor polyester staple fiber according to any one of claims 5 to 8, characterized in that: The following steps are involved: S1. At room temperature, zinc nitrate, NH2-BDC, PVP and Fe(acac)3 are added to a mixed solution of 480 ml DMF and ethanol in a mass ratio of 5:3, and stirred until completely dissolved. Then, the mixture is reacted at 90-110°C for 5-10 hours, washed with ethanol, dried, and calcined at 500-600°C for 1-3 hours to obtain ZnO / ZnFe2O4. S2, dispersing ZnO / ZnFe2O4 in excess methanol, then adding TiO2 and stirring continuously to make it uniformly mixed, and then drying the resulting solution at a temperature of 80-100°C for 10-14h to finally obtain a ZnO / ZnFe2O4@TiO2 composite material; S3, dispersing the ZnO / ZnFe2O4@TiO2 composite material in pure water at an addition amount of 1% to 2%, and continuously stirring until stable to obtain a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion; S4, soaking the polyester fiber in an aqueous solution of surfactant 9801 at a temperature of 40-60° C. under stirring, wherein the concentration of surfactant 9801 is 2-4 g / L, and the soaking time is 20-40 min, and finally washing and drying to obtain pretreated polyester fiber; S5, immersing the pretreated polyester fiber in a ZnO / ZnFe2O4@TiO2 composite material aqueous dispersion at a mass ratio of 1: (40-50), then slowly heating from room temperature to 90-100°C at a rate of 2-4°C / min, and then heating to 120-140°C at a rate of 1-2°C / min, and then keeping warm for 20-40 minutes, and finally cooling to room temperature, and finally immersing in a surfactant 9801 aqueous solution, washing at 40-60°C for 10-16 minutes, and finally washing and drying to obtain polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material; S6. Cut the polyester fiber loaded with ZnO / ZnFe2O4@TiO2 composite material to a length of 35 mm to obtain low-odor polyester staple fibers.