A method for preparing modified polyester fiber and a mask base fabric containing the polyester fiber.

Abstract

This invention provides a method for preparing modified polyester fiber and a mask base fabric containing the polyester fiber. First, an amino-protecting agent is used to amino-protect a diolamine compound. Then, a modified polyester is prepared using dialkyl terephthalate, a diol, and the amino-protected diolamine compound as raw materials. The surface of the fiber obtained by melt spinning is deprotected to obtain a fiber with active amino groups on the surface. Finally, a hydrophilic modified polyethylene terephthalate is obtained by grafting a glucosamine derivative onto a diglycidyl ether compound. The mask base fabric prepared with this and viscose fiber has good hydrophilicity and hydrophilicity retention ability.

Description

Technical Field

[0001] This invention belongs to the field of polyester fiber nonwoven technology, specifically relating to a method for preparing modified polyester fiber and a mask base fabric containing the polyester fiber. Background Technology

[0002] With the improvement of people's living standards and changes in climate and environment, people's understanding of face masks has been deepening. They are no longer limited to beauty and have gradually become an essential product for daily basic skin care, becoming the fourth largest daily skin care consumer product after lotion, cleanser, and skin cream.

[0003] Polyester fiber (PET fiber) is one of the basic materials for manufacturing sheet masks. In my country, polyester fiber has not only solved the clothing problem for over a billion people, but has also made significant progress in the fields of home textiles and industrial textiles, meeting and driving the development of many industrial and defense sectors. However, polyester does not contain hydrophilic groups and has extremely strong hydrophobicity, which greatly limits its application in the sheet mask field. Therefore, hydrophilic modification is a major task in expanding the application fields of polyester fiber. For example, patent CN105544193B discloses a method for hydrophilic modification of polyester fiber using bromoethane and PVA. The method involves adding sodium hydroxide solution to the polyester fiber for pretreatment by stirring and heating to damage the surface of the polyester fiber, facilitating subsequent modification. Bromoethane solution is then added to the polyester fiber for modification by stirring and heating. Finally, a 4-5.5% PVA solution is added to the polyester fiber, and the mixture is stirred and heated to obtain the hydrophilically modified polyester fiber. Patent CN105431470B discloses hydrophilic polyester fibers. The method includes treating polyester fibers with a mixture for a predetermined time to obtain treated polyester fibers, the mixture comprising at least one alkali and at least one hydrophilic polymer in a predetermined weight ratio; and curing the treated polyester fibers in a heated environment to obtain hydrophilic polyester fibers. The above describes a common hydrophilic modification of polyester fibers. The modified polyester fiber surface becomes hydrophilic and has a certain water absorption capacity. However, sheet masks need to have good water absorption properties and maintain high moisture retention capacity during long-term use. Although the fibers obtained by the above modification method have improved hydrophilicity, their long-term water retention performance is still unsatisfactory, resulting in poor adsorption and moisture retention capacity of the mask during use. Furthermore, the hydroentangling process causes the loss of some hydrophilic substances, which also reduces the water absorption and water retention of the polyester fibers.

[0004] Therefore, it is necessary to further study and improve the water absorption and water retention properties of polyester fibers in order to expand the application range of polyester fibers. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method for preparing modified polyester fibers and a mask base fabric containing the polyester fibers. The invention first uses an amino protectant to amino-protect a diolamine compound. Then, a modified polyester is prepared using dialkyl terephthalate, a diol, and the amino-protected diolamine compound as raw materials. The surface of the fiber obtained by melt spinning is deprotected to obtain fibers with active amino groups on the surface. Finally, a hydrophilic modified polyethylene terephthalate is obtained by grafting a glucosamine derivative onto a diglycidyl ether compound. The mask base fabric prepared from this modified polyethylene terephthalate and viscose fiber exhibits good hydrophilicity and hydrophilicity retention.

[0006] To achieve the above objectives, the following technical solution is adopted:

[0007] A method for preparing modified polyester fiber includes the following steps:

[0008] 1) Add diolamine compounds to an alcohol solvent, add a catalyst and an amino protectant, and react at a constant temperature. After the reaction is completed, cool, stir, filter, wash and dry to obtain diol derivatives for later use.

[0009] 2) Modified polyethylene terephthalate was prepared by sequentially passing dialkyl terephthalate, diol, and diol derivative obtained in step 1) through transesterification and polycondensation reactions. After the reaction was completed, the mixture was cooled, discharged, extruded by a twin-screw extruder, and granulated to obtain modified polyethylene terephthalate.

[0010] 3) The modified polyethylene terephthalate obtained in step 2) is melt-spun, cooled, shaped, drawn, and wound for later use;

[0011] 4) Immerse the fibers obtained in step 3) in a carbonate solution, heat to reflux under ultrasonic vibration and soak for reaction. After the reaction is complete, filter, wash and dry for later use.

[0012] 5) The fiber obtained in step 4) is soaked in a solution of diglycidyl ether compounds for a preliminary reaction. After the reaction is complete, it is filtered, washed, and then soaked in a solution of glucosamine derivatives for a preliminary reaction. After the reaction is complete, it is filtered, washed, and then placed in a drying oven for a constant temperature final curing to obtain the modified polyester fiber.

[0013] Further, the diolamine compound in step 1) is selected from one or a combination of two or more of 2-(aminomethyl)-1,3-propanediol, 2-amino-2-methyl-1,3-propanediol, 2-aminobutane-1,4-diol, 2-aminobutane-1,3-diol, 3-amino-1,5-pentanediol, 2-amino-2-ethyl-1,3-propanediol, 4-amino-1,2-butanediol, and threonine; the alcohol solvent is selected from at least one of methanol, ethanol, and isopropanol; and the catalyst is a tertiary amine. The compound is selected from one or a combination of two of triethylamine and benzyldimethylamine. The molar ratio of the catalyst to the amino group in the diolamine compound is 1-1.1:1. The amino protecting agent is selected from one of ethyl trifluoroacetate and methyl trifluoroacetate. The isothermal reaction temperature is 20-25℃, the reaction time is 12-48h, the cooling is to 5-10℃, the stirring time is 10-15min, and the molar ratio of the diolamine compound to the amino protecting agent is 1:1.08-1.15.

[0014] Further, in step 2), the dialkyl terephthalate is selected from at least one of dimethyl terephthalate, diethyl terephthalate, and dipropyl terephthalate; the diol is selected from at least one of ethylene glycol, propylene glycol, butanediol, polyethylene glycol, and trimethylene glycol.

[0015] Further, in step 2), the transesterification reaction conditions are: temperature 220-250℃, pressure 0-0.4MPa, reaction time 2-5h, and the transesterification catalyst is acetate, selected from one or more combinations of zinc acetate, manganese acetate, and magnesium acetate, with a catalyst dosage of 0.5-1wt% of dialkyl terephthalate; the conversion of the transesterification reaction to a polycondensation reaction is determined by the amount of methanol distilled from the transesterification reaction, and when the distillate amount is greater than 90% of the theoretical yield, the polycondensation reaction begins; the catalyst for the polycondensation reaction is Sb. The catalyst dosage is 0.5-1 wt% of dialkyl terephthalate; the polycondensation reaction conditions are: temperature 260-280℃, time 1-6h (until no more bubbles are generated), and vacuum degree 0.01-0.05MPa; the molar ratio of dialkyl terephthalate, diol, and diol derivative obtained in step 1) is 1:0.4-0.6:0.6-0.4, wherein the molar ratio of ester group to hydroxyl group is 1:1.0-1.1; the temperature of the twin-screw extruder is 190-230℃.

[0016] Further, in step 3), the melt spinning temperature is 290-310℃, the cooling and setting temperature is 140-160℃, the POY spinning speed is 2600-3000m / min, the POY draw ratio is 1.5-2 times, the FDY spinning speed is 4200-4600m / min, the FDY draw ratio is 3-3.5 times, and the winding speed is 3000-3500r / min.

[0017] Further, in step 4), the carbonate is selected from one or a combination of sodium carbonate and potassium carbonate, the carbonate solution concentration is 5-10 wt%, the solvent of the carbonate solution is selected from one or a combination of methanol and water, the temperature is raised to reflux, and the reaction time is 6-12 h.

[0018] Further, in step 5), the glucosamine derivative is selected from one or a combination of two or more of 2-amino-2-deoxy-D-glucopyranose, N-methyl-D-glucosamine, and N-ethyl-D-glucosamine; the diglycidyl ether compound is selected from one or a combination of two or more of diglycidyl ether, butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, and polypropylene glycol diglycidyl ether, preferably selected from one or a combination of two or more of diglycidyl ether, butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and ethylene glycol diglycidyl ether; the solvent for the diglycidyl ether compound solution is selected from chloroform, methanol, ethanol, and acetone. The solvent of the diolamine derivative solution is selected from one or a combination of two of the following: DMF, methanol, ethanol, n-butanol, n-propanol, and ethyl acetate, with a concentration of 0.15-0.50 mol / L. The initial reaction temperature of the immersion in the diglycidyl ether compound solution is 25-60℃, and the immersion reaction time is 6-24 h. The solvent of the glucosamine derivative solution is selected from one or a combination of two of the following: DMF, methanol, ethanol, n-butanol, n-propanol, and ethyl acetate, with a concentration of 0.15-0.50 mol / L. The initial reaction temperature of the immersion in the glucosamine derivative solution is 25-60℃, and the immersion reaction time is 6-24 h. The isothermal final curing temperature is 80-100℃, and the time is 1-3 h. The molar ratio of the diolamine compound: diglycidyl ether compound: glucosamine derivative is 1:0.20-0.25:0.20-0.25.

[0019] The present invention also provides a mask base fabric containing modified polyester fibers, comprising a polyester fiber layer and a viscose fiber layer, wherein the polyester fiber layer is made from the above-mentioned modified polyester fibers.

[0020] The viscose fiber has a fineness of 1.0-1.5 dtex and a length of 20-50 μm.

[0021] This invention also provides a method for preparing a mask base fabric containing modified polyester fibers, comprising the following steps:

[0022] Modified polyester fiber and viscose fiber are respectively processed by adding cotton, opening, carding, forming web and laying web to form modified polyester fiber layer and viscose fiber layer; the modified polyester fiber layer and viscose fiber layer are compounded in sequence, and the above-mentioned mask base fabric is obtained by pre-wetting, compacting, hydroentangling reinforcement, drying and winding.

[0023] The areal density of the modified polyester fiber layer before lamination is 30-50 g / m³. 2 20-35g / m² before viscose fiber layer lamination 2 .

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] This invention first uses an amino protectant to protect diolamine compounds. Then, a modified polyester is prepared using dialkyl terephthalate, diol, and the amino-protected diolamine compounds as raw materials. The surface of the fiber obtained by melt spinning is deprotected to obtain fibers with active amino groups on the surface. Finally, a hydrophilic modified polyethylene terephthalate is obtained by grafting a glucosamine derivative onto a diglycidyl ether compound. The mask base fabric prepared with this and viscose fiber has good hydrophilicity and hydrophilicity retention ability.

[0026] In addition, the modified polyethylene terephthalate (PET) prepared from amino-protected diolamine compounds has reduced molecular symmetry and regularity, and its crystallinity is reduced, which improves the softness of the resulting mask base fabric. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments, but is not limited to the contents of the specification. Unless otherwise specified, all "parts" mentioned in the embodiments of the present invention are parts by weight. All reagents used are commercially available in the art.

[0028] The viscose fiber was purchased from Hangzhou Youbiao Textile Co., Ltd., with a fineness of 1.2 dtex and a length of 32 μm.

[0029] Polyethylene glycol diglycidyl ether was purchased from Guangzhou Yinghong Chemical Co., Ltd., with an epoxy value of 0.56-0.67.

[0030] The polyester fiber was purchased from Shanghai Hengyi Polyester Fiber Co., Ltd., with a fineness of 1.5 dtex.

[0031] Preparation of modified polyester fibers

[0032] Preparation Example 1

[0033] 1) Add 1 mol of 2-(aminomethyl)-1,3-propanediol to methanol, add 1 mol of triethylamine, add 1.15 mol of ethyl trifluoroacetate, and react at 25°C for 14 h. After the reaction is completed, cool to 10°C, stir for 10 min, filter, wash with ethanol, and dry to obtain the diol derivative for later use.

[0034] 2) Add 1 mol of dimethyl terephthalate, 0.4 mol of ethylene glycol, 0.6 mol of the diol derivative obtained in step 1), and 0.97 g of zinc acetate, a catalyst for transesterification, to a reaction vessel and stir until homogeneous. First, carry out the transesterification reaction at 235℃ and 0.4 MPa for 5 hours. At this time, the methanol distillation amount is equal to 95% of the theoretical amount and enters the polycondensation reaction. Add 0.97 g of Sb2O3, a catalyst for polycondensation reaction, and stir until homogeneous. After reacting for 5 hours at 280℃ and a vacuum degree of 0.01 MPa, no more bubbles are generated. Stop the reaction, cool to room temperature, discharge the material, and extrude and granulate it through a twin-screw extruder to obtain modified polyethylene terephthalate. The temperatures of zones 1-6 of the twin-screw extruder are 190℃, 200℃, 210℃, 220℃, 230℃, and 220℃, respectively.

[0035] 3) The modified polyethylene terephthalate obtained in step 2) is melt-spun, cooled, drawn, and wound to obtain a ready-to-use product. The melt spinning temperature is 300℃, the cooling and setting temperature is 150℃, the POY spinning speed is 2800m / min, the POY draw ratio is 2, the FDY spinning speed is 4200m / min, the FDY draw ratio is 3.5, and the winding speed is 3000r / min.

[0036] 4) Immerse the fibers obtained in step 3) in a 5 wt% potassium carbonate solution, a mixture of methanol and water in a volume ratio of 1:1-3, and heat to reflux under ultrasonic vibration for 10 hours. After the reaction is complete, filter, wash, and dry for later use.

[0037] 5) The fiber obtained in step 4) is immersed in 1.25L of 0.2mol / L butanediol diglycidyl ether solution (the solvent is a mixture of ethanol and acetone in a volume ratio of 2.5:4) and heated to 60℃ for a preliminary reaction for 12h. After the reaction is completed, it is filtered, washed three times with ethanol, and immersed in 1L of 0.2mol / L 2-amino-2-deoxy-D-pyranose solution (the solvent is n-butanol) and heated to 60℃ for a preliminary reaction for 12h. After the reaction is completed, it is filtered, washed three times with n-butanol, and placed in a drying oven for a final curing at 90℃ for 3h to obtain the modified polyester fiber.

[0038] Preparation Example 2

[0039] The rest is the same as in Preparation Example 1, except that in step 1), 2-(aminomethyl)-1,3-propanediol is replaced with an equimolar amount of 3-amino-1,5-pentanediol.

[0040] Preparation Example 3

[0041] The rest is the same as in Preparation Example 1, except that the amount of ethylene glycol used in step 2) is 0.6 mol and the amount of the diol derivative used in step 1) is 0.4 mol.

[0042] Preparation Example 4

[0043] The rest is the same as in Preparation Example 1, except that in step 5), the amount of butanediol diglycidyl ether solution is 1 L, that is, the amount of butanediol diglycidyl ether used is 0.2 mol.

[0044] Preparation Example 5

[0045] The rest is the same as in Preparation Example 1, except that in step 5), the amount of butanediol diglycidyl ether solution is 0.75 L, that is, the amount of butanediol diglycidyl ether used is 0.15 mol.

[0046] Preparation Example 6

[0047] The rest is the same as in Preparation Example 1, except that in step 5), the amount of butanediol diglycidyl ether solution is 2L, that is, the amount of butanediol diglycidyl ether is 0.4mol, and the amount of 0.2mol / L 2-amino-2-deoxy-D-pyranose solution is 2L.

[0048] Preparation Example 7

[0049] The rest is the same as in Preparation Example 1, except that in step 5), equimolar amounts of polyethylene glycol diglycidyl ether are used instead of butylene glycol diglycidyl ether.

[0050] Preparation Example 8

[0051] The rest is the same as in Preparation Example 1, except that in step 5), 2-amino-2-deoxy-D-glucosamine is replaced with an equimolar amount of N-ethyl-D-glucosamine.

[0052] Comparative Preparation Example 1

[0053] The rest is the same as in Preparation Example 1, except that 2-amino-2-deoxy-D-glucopyranose is not grafted, i.e., step 5 is not performed.

[0054] Preparation of mask base fabric

[0055] Example 1

[0056] The modified polyester fiber and viscose fiber prepared in Example 1 were respectively subjected to processes such as cottoning, opening, carding, web forming, and web laying to form a surface density of 50 g / m². 2 Modified polyester fiber layer, 35g / m 2 The viscose fiber layer is compounded with a modified polyester fiber layer and a viscose fiber layer in sequence, and then pre-wetted, compacted, reinforced by high-pressure water jet puncture (water jet pressure is 50 bar), dried and wound to obtain the above-mentioned mask base fabric.

[0057] Examples 2-7

[0058] The rest is the same as in Example 1, except that the modified polyester fibers used correspond to those obtained in Preparation Examples 2-5.

[0059] Comparative Example 1

[0060] The rest is the same as in Example 1, except that the polyester fiber used is the same as that in Comparative Preparation Example 1.

[0061] Comparative Example 2

[0062] The rest is the same as in Example 1, except that the polyester fiber used is commercially available polyester fiber.

[0063] The mask base fabrics prepared in the above embodiments and comparative examples were subjected to the following performance tests:

[0064] Softness: Refer to GB / T18318-2001 Textiles - Determination of bending length of fabrics. The equipment is an LLY-01 electronic hardness tester. The sample strip is 30cm long and 6cm wide. Place one end of the narrow strip on a horizontal wooden board and measure the vertical distance from the protruding edge to the wooden board. Under the same protrusion length (9cm), the shorter the vertical distance, the smaller the bending stiffness, that is, the better the softness. Conversely, under the same protrusion length, the longer the vertical distance, the greater the bending stiffness, that is, the greater the hardness.

[0065] Antibacterial properties: Tested according to standard GB / T 20944.3-2008 Evaluation of antibacterial properties of textiles - Part 3: Vibration method.

[0066] Water absorption and water retention: The water absorption and water retention of the mask substrate were tested in accordance with GB / T24218.6-2010 Absorbency Determination. The mask substrate was cut into 10cm×10cm pieces.

[0067] Water absorption is expressed as liquid absorption S (g / g), where S = (m1-m0) / m0, m1 represents the mass of the mask substrate after it has been soaked in distilled water for 10 minutes, taken out, suspended vertically on a copper mesh, and left to stand for 1 minute to drain excess water, m0 represents the mass of the mask substrate before immersion in water, and S represents the maximum amount of water that a unit mass of mask substrate can absorb.

[0068] The water retention test was conducted at an ambient temperature of 25°C, a relative humidity of 60%, and standard atmospheric pressure, measuring the amount of liquid absorbed (S) by the mask substrate at regular intervals. t S t =(m t -m0) / m0, m t The mass of the mask substrate at time t is expressed in S. t The value is calculated as / S0, which represents the retention rate of water absorption over time. The higher the percentage, the better the water retention.

[0069] Table 1

[0070]

[0071] The water absorption and water retention test results of Examples 1, 4, and 5 show that increasing the amount of butylene glycol diglycidyl ether within a certain range can improve the water absorption and water retention of the mask. When the amount of butylene glycol diglycidyl ether exceeds the appropriate range, there are no more groups on the mask surface that can react with excess butylene glycol diglycidyl ether, and glucosamine derivatives cannot be grafted onto the mask to improve its water absorption and water retention. The water absorption and water retention test results of Example 7 show that macromolecular polyethylene glycol diglycidyl ether is less conducive to the grafting of glucosamine derivatives onto the mask compared to butylene glycol diglycidyl ether.

[0072] The antibacterial performance test results show that the grafted glucosamine derivative has a certain antibacterial effect on the film.

[0073] The above detailed description is a specific description of one of the feasible embodiments of the present invention. This embodiment is not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included within the scope of the technical solution of the present invention.

Claims

1. A method for producing a modified polyester fiber, characterized by, The method comprises the following steps: 1) adding a dihydric alcohol amine compound into an alcohol solvent, adding a catalyst, adding an amino protecting agent, and performing a reaction at a constant temperature, cooling after the reaction, filtering, washing, and drying after stirring to obtain a dihydric alcohol derivative for standby; 2) using dialkyl terephthalate, dihydric alcohol, and the dihydric alcohol derivative obtained in step 1) as raw materials, preparing modified polyethylene terephthalate by sequentially performing an ester exchange reaction and a polycondensation reaction, cooling and discharging after the reaction, and performing extrusion and granulation by a double-screw extruder to obtain the modified polyethylene terephthalate; 3) performing melt spinning on the modified polyethylene terephthalate obtained in step 2), and performing cooling and setting, drafting, and winding for standby; 4) immersing the fiber obtained in step 3) in a carbonate solution, heating to a reflux state under ultrasonic oscillation, and performing a soaking reaction, filtering, washing, and drying after the reaction to obtain a standby product; 5) immersing the fiber obtained in step 4) in a diglycidyl ether compound solution to perform a preliminary reaction, filtering and washing after the reaction, immersing in a glucosamine derivative solution to perform a preliminary reaction, filtering and washing after the reaction, and performing constant-temperature final curing in a drying box to obtain the modified polyester fiber; the dihydric alcohol amine compound is selected from one or a combination of two or more of 2-(aminomethyl)-1,3-propanediol, 2-amino-2-methyl-1,3-propanediol, 2-amino butane-1,4-diol, 2-amino butane-1,3-diol, 3-amino-1,5-pentanediol, 2-amino-2-ethyl-1,3-propanediol, 4-amino-1,2-butanediol, and threonine alcohol.

2. The method of claim 1, wherein the modified polyester fiber is prepared by the steps of: (a) preparing a polyester fiber; (b) applying a solution of a polyfunctional compound to the surface of the polyester fiber; and (c) drying the polyester fiber. In step 2), the molar ratio of the dialkyl terephthalate, dihydric alcohol, and the dihydric alcohol derivative obtained in step 1) is 1:0.4-0.6:0.6-0.4, and the molar ratio of the ester group to the hydroxyl group is 1:1.0-1.

1. The dialkyl terephthalate is at least one selected from dimethyl terephthalate, diethyl terephthalate, and dipropyl terephthalate; and the dihydric alcohol is at least one selected from ethylene glycol, propylene glycol, butanediol, and diethylene glycol.

3. The method of claim 1, wherein the modified polyester fiber is prepared by the steps of: (a) preparing a polyester fiber; (b) applying a solution of a polyfunctional compound to the surface of the polyester fiber; and (c) drying the polyester fiber. In step 1), the molar ratio of the dihydric alcohol amine compound, the diglycidyl ether compound in step 5), and the glucosamine derivative is 1:0.20-0.25:0.20-0.

25.

4. The method of claim 1, wherein the modified polyester fiber is prepared by the steps of: (a) preparing a polyester fiber; (b) applying a solution of a polyfunctional compound to the surface of the polyester fiber; and (c) drying the polyester fiber. In step 4), the carbonate is selected from one or a combination of two of sodium carbonate and potassium carbonate, the concentration of the carbonate solution is 5-10 wt%, the solvent of the carbonate solution is selected from one or a combination of two of methanol and water, the heating is to a reflux state, and the reaction time is 6-12 h.

5. The method of claim 1, wherein the modified polyester fiber is prepared by the steps of: (a) preparing a polyester fiber; (b) applying a solution of a polyfunctional compound to the surface of the polyester fiber; and (c) drying the polyester fiber. Step 5) the glucosamine derivative is selected from one or more than two combinations of 2-amino-2-deoxy-D-glucopyranose, N-methyl-D-glucosamine, N-ethyl-D-glucosamine; the diglycidyl ether compound is selected from one or more than two combinations of diglycidyl ether, butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether.

6. The method of producing a modified polyester fiber according to claim 5, characterized by, Step 5) the glucosamine derivative is 2-amino-2-deoxy-D-glucopyranose; the diglycidyl ether compound is selected from one or more than two combinations of diglycidyl ether, butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, ethylene glycol diglycidyl ether.

7. The method of claim 1, wherein the modified polyester fiber is prepared by the steps of: (a) preparing a polyester fiber; (b) applying a solution of a polyfunctional compound to the surface of the polyester fiber; and (c) drying the polyester fiber. Step 5) the solvent of the diglycidyl ether compound solution is selected from one or a combination of two of chloroform, methanol, ethanol, acetone, with a concentration of 0.15-0.50 mol / L, the preliminary reaction temperature of the soaking in the diglycidyl ether compound solution is 25-60°C, and the soaking reaction time is 6-24 h; the solvent of the glucosamine derivative solution is selected from one or a combination of two of DMF, methanol, ethanol, n-butanol, n-propanol, ethyl acetate, with a concentration of 0.15-0.50 mol / L, the preliminary reaction temperature of the soaking in the glucosamine derivative solution is 25-60°C, and the soaking reaction time is 6-24 h.

8. The method for preparing modified polyester fiber according to claim 1, characterized in that, The constant temperature final curing temperature is 80-100°C, and the time is 1-3 h.

9. A method for producing a mask base fabric containing the modified polyester fiber according to any one of claims 1 to 8, characterized by, The method comprises the following steps: The modified polyester fibers and the viscose fibers are respectively cottonized, opened, carded, formed into a layer, and laid into a layer to form a modified polyester fiber layer and a viscose fiber layer; the modified polyester fiber layer and the viscose fiber layer are sequentially compounded, pre-wetted, compacted, hydroentangled, dried, and wound to obtain the above-mentioned facial mask substrate.

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