A high moisture-absorbing polyester composite material and a method for manufacturing the same

Abstract

The application relates to the technical field of high polymer materials, and discloses a high-hygroscopic polyester composite material and a preparation method thereof. The polyester composite material prepared by the application is prepared by taking PTT polyester and hygroscopic modified polyester as main raw materials and adding a toughening agent, an antioxidant, an ultraviolet absorber and a lubricant, and the fiber yarn prepared by using the polyester composite material has high hygroscopicity while keeping the breaking strength and elongation at break. Therefore, the fabric prepared by taking the composite material as raw material has excellent moisture regain and hygroscopicity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a high-hygroscopic polyester composite material and a preparation method thereof. BACKGROUND

[0002] Polyesters (such as PET, PBT, etc.) are widely used in the fields of fibers, films, engineering plastics, etc. due to their excellent mechanical properties, chemical resistance and processing performance. However, the traditional polyester materials have the following problems: (1) the polyester molecular chain is mainly composed of benzene ring, ester bond and methylene, and lacks strong polar groups, resulting in poor hygroscopicity (usually moisture regain <0.4%); (2) in the textile field, poor hydrophobicity leads to poor moisture absorption and perspiration performance, and strong hot feeling when wearing; (3) in the composite material, the polyester is well combined with non-polar fillers (such as carbon fibers, glass fibers), but the interfacial adhesion with hydrophilic substances (such as cellulose, protein fibers) is weak.

[0003] To improve the hygroscopicity of polyester, the traditional modification methods are: (1) increasing the surface hydrophilicity by plasma, alkali treatment or coating, but the effect is short-term, easy to wear and tear, and only improves the surface, without improving the overall hygroscopicity; (2) blending with hydrophilic polymers (such as polyvinyl alcohol, polyacrylic acid), but the compatibility is poor, easy to separate, and the mechanical properties decrease significantly after absorbing moisture; (3) adding hydrophilic nanomaterials (such as SiO2, montmorillonite), but the nanomaterials are difficult to disperse in the matrix, and the hygroscopicity is limited. Therefore, researchers need to develop a polyester composite material with high hygroscopicity without sacrificing mechanical properties to meet the application of the material in the fields of sportswear, medical dressings or antistatic materials, etc. SUMMARY

[0004] To solve the above technical problems, the present application provides a high-hygroscopic polyester composite material and a preparation method thereof.

[0005] The object of the present application can be achieved by the following technical solutions:

[0006] A high-hygroscopic polyester composite material, comprising the following raw materials by weight: PTT polyester 40-50 parts, hygroscopic modified polyester 35-55 parts, toughening agent 15-25 parts, antioxidant 0.5-2 parts, ultraviolet absorber 1.5-3.5 parts, lubricant 1-2 parts;

[0007] Further, the toughening agent is one of maleic anhydride grafted ethylene-propylene-diene copolymer and glycidyl methacrylate grafted ethylene-butene copolymer;

[0008] Further, the antioxidant is one of antioxidant 1010, antioxidant DLTP or antioxidant 168;

[0009] Further, the ultraviolet absorber is one of ultraviolet absorber UV329 or ultraviolet absorber UV-234;

[0010] Further, the lubricant is one of zinc stearate or polyethylene wax;

[0011] The moisture absorption modified polyester is prepared by the following steps:

[0012] Step A1, mixing p-phenylene diisocyanate, sodium hydroxide and toluene uniformly, adding 2,2'-oxo-bisethylamine dihydrochloride, and heating to 70℃, stirring under nitrogen protection for 16-20h, rotary evaporation, drying, to obtain an amino-terminated ether derivative;

[0013] Further, in step A1, the amount ratio of p-phenylene diisocyanate, sodium hydroxide, toluene and 2,2'-oxo-bisethylamine dihydrochloride is 0.01-0.02mol:2-5g:50mL:0.021-0.042mol;

[0014] Step A2, adding 2-chloro-5-hydroxypyridine, amino-terminated ether derivative and cesium carbonate into dimethyl sulfoxide, stirring at 105℃ for 24h, then adding saturated ammonium chloride solution and stirring for 10min, extracting, washing, drying, column chromatography purification, to obtain a hydroxyl-terminated pyridine-ether derivative;

[0015] Further, in step A2, the amount ratio of 2-chloro-5-hydroxypyridine, amino-terminated ether derivative, cesium carbonate, dimethyl sulfoxide and saturated ammonium chloride solution is 0.02-0.04mol:0.01-0.02mol:6.5-13g:50mL:100mL;

[0016] Step A3, stirring the hydroxyl-terminated pyridine-ether derivative in methanol at room temperature and under nitrogen condition, then adding 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution, and heating to 35-45℃ for 3.5-4.5h, rotary evaporation, drying, to obtain a modifier;

[0017] Further, in step A3, the amount ratio of hydroxyl-terminated pyridine-ether derivative, methanol and 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution is 0.01mol:50mL:50mL;

[0018] Further, the 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution in step A3 is prepared by mixing 3-prop-2-enoyloxypropane-1-sulfonic acid sodium and methanol with an amount ratio of 0.02-0.025mol:50mL;

[0019] Step A4, terephthalic acid, 1,3-propanediol and modifier are added into a reaction kettle according to a molar ratio of 1:0.8:0.3-0.5, 45-55 ppm of thermal stabilizer triethyl phosphate and 150-250 ppm of antimony trioxide are added, vacuum is drawn and replaced with nitrogen twice, esterification is carried out under nitrogen at 230-250 DEG C, when the water output reaches 90% of the theoretical value, the fine tuning valve is slowly opened, and the pressure is released to normal pressure, and then the temperature is increased to 270 DEG C, vacuum pre-polycondensation is carried out for 50 min, the kettle temperature is controlled at 275 DEG C, and the polycondensation reaction is carried out for 3 h, the material is discharged, cooled and pelletized, and a hygroscopic modified polyester is obtained.

[0020] A preparation method of a high-hygroscopic polyester composite material comprises the following steps:

[0021] The raw materials are weighed, the PTT polyester, the hygroscopic modified polyester, the toughening agent, the antioxidant, the ultraviolet absorber and the lubricant are added into a stirring machine and stirred uniformly, transferred into a double-screw extruder, extruded, pelletized, dried, and a high-hygroscopic polyester composite material is obtained.

[0022] Further, the extrusion temperature in the double-screw extruder is 260-270 DEG C, and the screw rotation speed is 350-550 rpm / min.

[0023] The polyester composite material prepared by the method has the following beneficial effects:

[0024] The polyester composite material prepared by the method is prepared by taking PTT polyester and hygroscopic modified polyester as main raw materials, and adding a toughening agent, an antioxidant, an ultraviolet absorber and a lubricant, the fiber yarn made of the polyester composite material has high hygroscopicity while maintaining the breaking strength and elongation at break, and therefore, the fabric made of the composite material has excellent moisture regain and hygroscopicity.

[0025] The hygroscopic modified polyester introduced into the polyester composite material is prepared by taking terephthalic acid, 1,3-propanediol and a modifier as main raw materials, and adding a thermal stabilizer and a catalyst; the terminal hydroxyl group contained in the modifier can participate in esterification, and then the ether bond, the sodium sulfonate structure and the pyridine structure contained in the modifier are introduced into the polyester molecular chain, the three structures synergistically improve the hygroscopicity of the polyester composite material, because the ether bond can increase the flexibility and free volume of the molecular chain, facilitate the diffusion of water molecules into the composite material, the nitrogen atom in the pyridine structure contains a lone pair of electrons, can form a hydrogen bond with water molecules, improve the hygroscopicity, and the pyridine is weakly alkaline, can weakly protonate with acidic water molecules in the environment, promote the water absorption of the composite material, and the sodium sulfonate is a strong hydrophilic group, located in the side chain of the polyester molecular chain, the group is dissociated into -SO3 - and Na + in water, significantly enhances the polarity, and attracts water molecules, Na +The amine group is easy to combine with water molecules to form a hydrated ion, further improving the moisture absorption. In addition, the introduction of ether bond or pyridine ring in the rigid polyester chain will disturb the regular arrangement of the molecular chain, reduce the crystallinity, and the flexibility of the ether bond and the rigid heterocyclic structure of the pyridine ring can also increase the molecular chain spacing, form more pores, facilitate the diffusion of water molecules, and further improve the moisture absorption. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0027] Embodiment 1: The modifier is prepared by the following steps:

[0028] Step A1, 0.01 mol of p-phenylene diisocyanate, 2 g of sodium hydroxide and 50 mL of toluene are uniformly mixed, 0.021 mol of 2,2'-oxobisethylamine dihydrochloride is added, and heated to 70°C, stirred for 16 h under nitrogen protection, rotary evaporation, drying, to obtain an amino-ether-containing derivative;

[0029] Step A2, 0.02 mol of 2-chloro-5-hydroxypyridine, 0.01 mol of amino-ether-containing derivative and 6.5 g of cesium carbonate are added to 50 mL of dimethyl sulfoxide, stirred at 105°C for 24 h, then 100 mL of saturated ammonium chloride solution is added and stirred for 10 min, extracted, washed, dried, column chromatography purification, to obtain a hydroxyl pyridine-ether-containing derivative;

[0030] Step A3, 0.01 mol of the hydroxyl pyridine-ether-containing derivative is uniformly stirred in 50 mL of methanol at room temperature and under nitrogen, then 50 mL of 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution is added, and the temperature is raised to 35°C for reaction for 3.5 h, rotary evaporation, drying, to obtain the modifier, wherein the 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution is prepared by mixing 3-prop-2-enoyloxypropane-1-sulfonic acid sodium and methanol at a ratio of 0.02 mol:50 mL;

[0031] Step A4, p-Phthalic acid, 1,3-propanediol and the modifier are added into the reaction kettle according to the molar ratio of 1:0.8:0.3, 45 ppm of thermal stabilizer triethyl phosphate and 150 ppm of antimony trioxide are added, vacuum and nitrogen replacement are carried out twice, esterification is carried out under nitrogen at 230℃, when the water output reaches 90% of the theoretical value, the fine tuning valve is slowly opened, and it is unloaded to normal pressure, and then it is heated to 270℃, vacuum pre-polycondensation reaction is carried out for 50 min, the temperature in the kettle is controlled at 275℃, polycondensation reaction is carried out for 3h, and then it is discharged, cooled and granulated, thereby obtaining the moisture absorption modified polyester.

[0032] Example 2: The modifier is prepared by the following steps:

[0033] Step A1, 0.015 mol of p-phenylene diisocyanate, 3.5 g of sodium hydroxide and 50 mL of toluene are uniformly mixed, 0.036 mol of 2,2'-oxobisethylamine dihydrochloride is added, and heated to 70℃, and stirred for 18h under nitrogen protection, rotary evaporation and drying, thereby obtaining the amino-terminated ether derivative;

[0034] Step A2, 0.03 mol of 2-chloro-5-hydroxypyridine, 0.015 mol of amino-terminated ether derivative and 9.5 g of cesium carbonate are added into 50 mL of dimethyl sulfoxide, stirred at 105℃ for 24h, then 100 mL of saturated ammonium chloride solution is added and stirred for 10 min, extracted, washed, dried, column chromatography purification, thereby obtaining the hydroxyl-terminated pyridine-ether derivative;

[0035] Step A3, 0.01 mol of the hydroxyl-terminated pyridine-ether derivative is uniformly stirred in 50 mL of methanol at room temperature and under nitrogen, 50 mL of 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution is added, and heated to 40℃ for 4h, rotary evaporation and drying, thereby obtaining the modifier, wherein the 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution is prepared by mixing 3-prop-2-enoyloxypropane-1-sulfonic acid sodium and methanol at a ratio of 0.022 mol:50 mL;

[0036] Step A4, p-Phthalic acid, 1,3-propanediol and the modifier are added into the reaction kettle according to the molar ratio of 1:0.8:0.4, 50 ppm of thermal stabilizer triethyl phosphate and 200 ppm of antimony trioxide are added, vacuum and nitrogen replacement are carried out twice, esterification is carried out under nitrogen at 240℃, when the water output reaches 90% of the theoretical value, the fine tuning valve is slowly opened, and it is unloaded to normal pressure, and then it is heated to 270℃, vacuum pre-polycondensation reaction is carried out for 50 min, the temperature in the kettle is controlled at 275℃, polycondensation reaction is carried out for 3h, and then it is discharged, cooled and granulated, thereby obtaining the moisture absorption modified polyester.

[0037] Example 3: The modifier is prepared by the following steps:

[0038] Step A1, 0.02 mol of p-phenylenediisocyanate, 5 g of sodium hydroxide and 50 mL of toluene were mixed uniformly, 0.042 mol of 2,2'-oxobisethylamine dihydrochloride was added, and heated to 70°C, stirred for 20 h under nitrogen protection, rotary evaporation, drying, to obtain an amino-ether derivative;

[0039] Step A2, 0.04 mol of 2-chloro-5-hydroxypyridine, 0.02 mol of amino-ether derivative and 13 g of cesium carbonate were added to 50 mL of dimethyl sulfoxide, stirred at 105°C for 24 h, then 100 mL of saturated ammonium chloride solution was added and stirred for 10 min, extracted, washed, dried, column chromatography purification, to obtain a hydroxyl pyridine-ether derivative;

[0040] Step A3, 0.01 mol of hydroxyl pyridine-ether derivative was stirred uniformly in 50 mL of methanol at room temperature and under nitrogen, then 50 mL of 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution was added, and the temperature was raised to 45°C for reaction for 4.5 h, rotary evaporation, drying, to obtain a modifier, wherein the 3-prop-2-enoyloxypropane-1-sulfonic acid sodium methanol solution was prepared by mixing 3-prop-2-enoyloxypropane-1-sulfonic acid sodium and methanol at a ratio of 0.025 mol:50 mL;

[0041] Step A4, terephthalic acid, 1,3-propanediol and the modifier were added to the reaction kettle at a molar ratio of 1:0.8:0.5, 55 ppm of thermal stabilizer triethyl phosphate and 250 ppm of antimony trioxide were added, vacuumed and replaced with nitrogen twice, then esterified at 250°C under nitrogen, when the water output reached 90% of the theoretical value, the fine tuning valve was slowly opened to release to normal pressure, then the temperature was raised to 270°C, vacuum pre-polycondensation reaction was carried out for 50 min, the temperature in the kettle was controlled at 275°C, and the polycondensation reaction was carried out for 3 h, then the material was discharged, cooled and pelletized, to obtain a hygroscopic modified polyester.

[0042] Example 4: A method for preparing a high-hygroscopic polyester composite material includes the following steps:

[0043] PTT polyester 40 parts, hygroscopic modified polyester prepared in Example 1 35 parts, maleic anhydride grafted ethylene-propylene-diene copolymer 15 parts, antioxidant DLTP 0.5 parts, ultraviolet absorber UV329 1.5 parts, zinc stearate 1-2 parts;

[0044] The raw materials are weighed by parts by weight, the PTT polyester, the moisture absorption modified polyester prepared in Example 1, the maleic anhydride grafted ethylene-propylene-diene copolymer, the antioxidant DLTP, the ultraviolet absorber UV329 and the zinc stearate are stirred uniformly in a blender, and then are transferred to a twin-screw extruder for extrusion, granulation and drying, thereby obtaining a high moisture absorption polyester composite material, wherein the extrusion temperature in the twin-screw extruder is 260°C, and the screw rotation speed is 350 rpm / min.

[0045] Example 5: A method for preparing a high moisture absorption polyester composite material includes the following steps:

[0046] The PTT polyester is 45 parts by weight, the moisture absorption modified polyester prepared in Example 2 is 45 parts by weight, the maleic anhydride grafted ethylene-propylene-diene copolymer is 20 parts by weight, the antioxidant 1010 is 1 part by weight, and the ultraviolet absorber UV-234 is 2.5 parts by weight.

[0047] The raw materials are weighed by parts by weight, the PTT polyester, the moisture absorption modified polyester prepared in Example 2, the maleic anhydride grafted ethylene-propylene-diene copolymer, the antioxidant 1010, the ultraviolet absorber UV-234 and the polyethylene wax are stirred uniformly in a blender, and then are transferred to a twin-screw extruder for extrusion, granulation and drying, thereby obtaining a high moisture absorption polyester composite material, wherein the extrusion temperature in the twin-screw extruder is 265°C, and the screw rotation speed is 450 rpm / min.

[0048] Example 6: A method for preparing a high moisture absorption polyester composite material includes the following steps:

[0049] The PTT polyester is 50 parts by weight, the moisture absorption modified polyester prepared in Example 3 is 55 parts by weight, the glycidyl methacrylate grafted ethylene-butene copolymer is 25 parts by weight, the antioxidant 168 is 2 parts by weight, and the ultraviolet absorber UV-234 is 3.5 parts by weight.

[0050] The raw materials are weighed by parts by weight, the PTT polyester, the moisture absorption modified polyester prepared in Example 3, the glycidyl methacrylate grafted ethylene-butene copolymer, the antioxidant 168, the ultraviolet absorber UV-234 and the polyethylene wax are stirred uniformly in a blender, and then are transferred to a twin-screw extruder for extrusion, granulation and drying, thereby obtaining a high moisture absorption polyester composite material, wherein the extrusion temperature in the twin-screw extruder is 270°C, and the screw rotation speed is 550 rpm / min.

[0051] Comparative Example 1: This comparative example is a polyester composite material, which is different from Example 6 in that the moisture absorption modified polyester prepared in Example 3 is replaced by PTT polyester, and the rest are the same.

[0052] Comparative Example 2: This comparative example is a polyester composite material, which is different from Example 6 in that the moisture absorption modified polyester prepared in Example 3 is replaced by polyester, and the rest are the same.

[0053] The polyester is prepared by the following steps: terephthalic acid, 1,3-propanediol and hydroxyl-terminated pyridine-ether derivative are added into a reaction kettle according to a molar ratio of 1:0.8:0.5, 55 ppm of thermal stabilizer triethyl phosphate and 250 ppm of antimony trioxide are added, vacuumizing and replacing with nitrogen twice, esterification is carried out under nitrogen at 250 ℃, when the water output reaches 90% of the theoretical value, the fine tuning valve is slowly opened, and the pressure is released to normal pressure, and then the temperature is increased to 270 ℃, vacuum pre-polycondensation is carried out for 50 min, the temperature in the kettle is controlled at 275 ℃, and the polycondensation reaction is carried out for 3 h, the material is discharged, cooled and granulated, and the polyester is obtained.

[0054] The polyester FDY yarns are prepared by adopting H-shaped spinneret according to the FDY process, the polyester FDY yarns are spun to prepare warp yarns with a linear density of 28 tex and weft yarns with a linear density of 22 tex, and then a fabric is woven, and the polyester FDY yarns and the fabric are tested.

[0055] Tensile breaking property test: The polyester FDY yarns are tested according to the standard of GB / T 14344-2008 “Chemical fiber filament tensile property test method”;

[0056] Moisture regain property test: The polyester FDY yarns are tested according to the standard of GB / T 6503-2017 “Chemical fiber moisture regain test method”;

[0057] Water absorption property test: The fabric made of the polyester FDY yarns is cut into three small pieces, the initial mass (M1) is recorded, the fabric is put into a beaker containing water and soaked for 1 h, then the water on the surface of the fabric is absorbed with filter paper until no water drops are naturally dropped, the mass (M2) is measured, and the water absorption rate is calculated, the average value of three results is calculated according to the formula: M = (M2-M1) / M1, wherein M is the water absorption rate, M1 is the dry weight of the fabric, and M2 is the weight of the fabric after water absorption;

[0058] The test results are shown in Table 1:

[0059] Table 1: Performance test results

[0060]

[0061] As can be seen from Table 1, the fiber prepared by spinning the polyester composite material prepared by the application has good breaking strength and elongation at break, and also has excellent moisture regain, and the fabric made of the fiber also has high water absorption rate.

[0062] The above merely illustrates and describes the concept of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, as long as the modifications or supplements or replacements do not deviate from the scope defined by the concept of the present application, and should belong to the protection scope of the present application.

Claims

1. A highly absorbent polyester composite material, characterized in that, The raw materials include the following parts by weight: 40-50 parts PTT polyester, 35-55 parts moisture-absorbing modified polyester, 15-25 parts toughening agent, 0.5-2 parts antioxidant, 1.5-3.5 parts ultraviolet absorber, and 1-2 parts lubricant. The moisture-absorbing modified polyester is prepared by esterification and polycondensation reaction of terephthalic acid, 1,3-propanediol and modifier in a molar ratio of 1:0.8:0.3-0.

5. The modifier is prepared by reacting terminal hydroxypyridine-ether derivative and sodium 3-propenyloxypropane-1-sulfonate at 35-45℃ for 3.5-4.5h. The terminal hydroxypyridine-ether derivative is prepared by reacting 2-chloro-5-hydroxypyridine and terminal amino-ether derivative at 105℃ with stirring for 24h. The terminal amino-ether derivative is prepared by reacting terephthalic diisocyanate and 2,2'-oxodiethylamine dihydrochloride at 70℃ with stirring for 16-20h.

2. The highly absorbent polyester composite material according to claim 1, characterized in that, The moisture-modified polyester is prepared by the following steps: Step A1: Mix terephthalic diisocyanate, sodium hydroxide and toluene evenly, add 2,2'-oxodiethylamine dihydrochloride, heat to 70°C, stir and react for 16-20 h under nitrogen protection, rotary evaporate and dry to obtain the terminal amino ether derivative. Step A2: Add 2-chloro-5-hydroxypyridine, the amino-terminated ether derivative and cesium carbonate to dimethyl sulfoxide, stir at 105°C for 24 h, then add saturated ammonium chloride solution and stir for 10 min, extract, wash, dry and purify by column chromatography to obtain the amino-terminated hydroxypyridine-ether derivative. Step A3: The terminal hydroxyl pyridine-ether derivative is stirred evenly in methanol at room temperature and under nitrogen atmosphere. Then, a sodium 3-prop-2-enoyloxypropane-1-sulfonate methanol solution is added, and the mixture is heated to 35-45℃ and reacted for 3.5-4.5 hours. The mixture is then rotary evaporated and dried to obtain the modifier. Step A4: Add terephthalic acid, 1,3-propanediol, and modifier to the reactor in a molar ratio of 1:0.8:0.3-0.

5. Add 45-55 ppm of heat stabilizer triethyl phosphate and 150-250 ppm of antimony trioxide. After vacuuming and nitrogen purging twice, esterify under nitrogen at 230-250℃. When the water output reaches 90% of the theoretical value, slowly open the fine-tuning valve to release to atmospheric pressure, then raise the temperature to 270℃. After a 50-minute vacuum pre-condensation reaction, control the temperature inside the reactor at 275℃ and perform the condensation reaction for 3 hours. Discharge, cool, and pelletize to obtain the moisture-absorbing modified polyester.

3. The highly absorbent polyester composite material according to claim 2, characterized in that, In step A1, the ratio of terephthalic diisocyanate, sodium hydroxide, toluene, and 2,2'-oxodiethylamine dihydrochloride is 0.01-0.02 mol: 2-5 g: 50 mL: 0.021-0.042 mol.

4. The highly absorbent polyester composite material according to claim 2, characterized in that, In step A2, the ratio of 2-chloro-5-hydroxypyridine, terminal amino-containing ether derivative, cesium carbonate, dimethyl sulfoxide, and saturated ammonium chloride solution is 0.02-0.04 mol: 0.01-0.02 mol: 6.5-13 g: 50 mL: 100 mL.

5. The highly absorbent polyester composite material according to claim 2, characterized in that, In step A3, the ratio of the amount of terminal hydroxypyridine-ether derivative, methanol, and sodium 3-prop-2-enoyloxypropane-1-sulfonate in methanol is 0.01 mol: 50 mL: 50 mL.

6. The highly absorbent polyester composite material according to claim 2, characterized in that, The sodium 3-prop-2-enoyloxypropane-1-sulfonate methanol solution described in step A3 is prepared by mixing and stirring sodium 3-prop-2-enoyloxypropane-1-sulfonate and methanol at a ratio of 0.02-0.025 mol: 50 mL.

7. The highly absorbent polyester composite material according to claim 1, characterized in that, The toughening agent is one of maleic anhydride-grafted ethylene-propylene-diene copolymer and glycidyl methacrylate-grafted ethylene-butene copolymer.

8. The highly absorbent polyester composite material according to claim 1, characterized in that, The antioxidant is one of antioxidant 1010, antioxidant DLTP, or antioxidant 168.

9. The highly absorbent polyester composite material according to claim 1, characterized in that, The ultraviolet absorber is one of ultraviolet absorber UV329 or ultraviolet absorber UV-234, and the lubricant is one of zinc stearate or polyethylene wax.

10. A method for preparing the highly absorbent polyester composite material according to any one of claims 1-9, characterized in that, Includes the following steps: Weigh the raw materials according to the weight parts, add PTT polyester, moisture-absorbing modified polyester, toughening agent, antioxidant, ultraviolet absorber and lubricant into the mixer and stir evenly, transfer to the twin-screw extruder for extrusion, granulation and drying to obtain the high moisture-absorbing polyester composite material. The extrusion temperature in the twin-screw extruder is 260-270℃ and the screw speed is 350-550rpm / min.

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