阅读说明：本技术 一种可降解亲水聚酯纤维及其制备方法 (Degradable hydrophilic polyester fiber and preparation method thereof ) 是由 史利梅 王栋 刘传生 赵青华 王伟 于 2020-04-08 设计创作，主要内容包括：本发明公开了一种可降解亲水聚酯纤维及其制备方法,该可降解亲水聚酯纤维主链嵌有经聚乙二醇封端的乳酸分子链段；聚乙二醇为PEG100、PEG200、PEG300、PEG400、PEG500、PEG600、PEG700、PEG800、PEG900或PEG1000中的一种,其中,所述聚酯和经聚乙二醇封端的乳酸的质量比为0.5～0.95：0.05～0.5,并提供该可降解亲水聚酯纤维的制备方法,本发明的亲水聚酯纤维具有良好的亲水性、生物相容性和生物降解性能。(The invention discloses a degradable hydrophilic polyester fiber and a preparation method thereof, wherein a lactic acid molecular chain segment which is terminated by polyethylene glycol is embedded in the main chain of the degradable hydrophilic polyester fiber; the polyethylene glycol is one of PEG100, PEG200, PEG300, PEG400, PEG500, PEG600, PEG700, PEG800, PEG900 or PEG1000, wherein the mass ratio of the polyester to the lactic acid terminated by the polyethylene glycol is 0.5-0.95: 0.05-0.5, and provides a preparation method of the degradable hydrophilic polyester fiber, and the hydrophilic polyester fiber has good hydrophilicity, biocompatibility and biodegradability.)

1. A degradable hydrophilic polyester fiber is characterized in that: the main chain of the degradable hydrophilic polyester fiber is embedded with a lactic acid molecular chain segment which is terminated by polyethylene glycol; the polyethylene glycol is one of PEG100, PEG200, PEG300, PEG400, PEG500, PEG600, PEG700, PEG800, PEG900 or PEG1000, wherein the mass ratio of the polyester to the lactic acid terminated by the polyethylene glycol is 0.5-0.95: 0.05 to 0.5.

2. The degradable hydrophilic polyester fiber according to claim 1, wherein: the polyester is one or more of polyethylene terephthalate, polytrimethylene terephthalate and polybutylene terephthalate.

3. The degradable hydrophilic polyester fiber according to claim 1, wherein: the block mode of the polyethylene glycol and the acetic acid molecules is a random block mode.

4. A method for preparing the degradable hydrophilic polyester fiber of claim 1, comprising the steps of:

(1) preparing terephthalic acid, diol, a first catalyst and a stabilizer into polymerization slurry, and performing one-step esterification to obtain a polyester prepolymer, wherein the molar ratio of the terephthalic acid to the diol to the first catalyst to the stabilizer is 1: 1.18 to 2: 0.0005 to 0.5: 0.0005 to 0.55;

(2) drying lactic acid at the temperature of 60-110 ℃ and the vacuum degree of 10-350Pa, adding a second catalyst, and performing prepolymerization in a nitrogen environment to obtain a polylactic acid prepolymer, wherein the molar ratio of the lactic acid to the second catalyst is 1: 0.001 to 0.05;

(3) adding polyethylene glycol into the polylactic acid prepolymer for hydroxyl end capping to prepare a polylactic acid oligomer end capped by polyethylene glycol, wherein the mass ratio of the polylactic acid prepolymer to the polyethylene glycol is 1: 0.001 to 0.5;

(3) mixing the polyester prepolymer with a polylactic acid oligomer, and carrying out vacuum polycondensation to prepare degradable hydrophilic polyester;

(4) and drying the degradable hydrophilic polyester, and carrying out melt spinning to obtain the degradable hydrophilic polyester fiber.

5. The method for preparing the degradable hydrophilic polyester fiber according to claim 4, wherein: in the step (1), the diol is one or more of ethylene glycol, propylene glycol and butanediol; the first catalyst is one of antimony trioxide, antimony disulfide, tetraisopropyl titanate, tetraisobutyl titanate, stannous oxalate and antimony triacetate; the stabilizer is one of triphenyl phosphate, triphenyl phosphite or diphenyl phosphate.

6. The method for preparing the degradable hydrophilic polyester fiber according to claim 4, wherein: the one-step esterification temperature in the step (1) is 240-255 ℃; the pressure of the one-step esterification is 0.2-0.4 MPa.

7. The method for preparing the degradable hydrophilic polyester fiber according to claim 4, wherein: the polymerization temperature in the step (2) is 110-.

8. The method for preparing the degradable hydrophilic polyester fiber according to claim 4, wherein: in the step (2), the second catalyst is one of stannous chloride, stannous octoate and yttrium oxide.

9. The method for preparing the degradable hydrophilic polyester fiber according to claim 4, wherein: in the step (3), the vacuum polycondensation temperature is 230-280 ℃, and the vacuum polycondensation time is 1-10 h.

10. The method for preparing the degradable hydrophilic polyester fiber according to claim 4, wherein: the melt spinning temperature in the step (4) is 220-290 ℃.

Technical Field

The invention relates to a polyester fiber and a preparation method thereof, in particular to a degradable hydrophilic polyester fiber and a preparation method thereof, and belongs to the field of functional fiber materials.

Background

The polyester fiber is an important clothing fiber, has excellent rigidity, heat resistance, mechanical property and electrical property, and has extremely wide application in the industries of textile, food, building, electronic and electric appliances and the like. However, the use of polyesters is limited by their slow crystallization rate, poor impact properties, and difficulty in degradation. In order to prepare a biodegradable polyester modified material with good mechanical property and good thermal stability, blending and copolymerization modification of polyester become a research hotspot problem of people. Polylactic acid (PLA) is an aliphatic polyester which can be completely biodegraded, has a molecular main chain containing an ester group which is easy to hydrolyze, is an environment-friendly polymer, and has wide application in the fields of biological medicines, fiber non-woven fabrics and the like.

The invention discloses a preparation method of multifunctional hydrophilic polyester fiber, which is characterized by comprising the following steps of (1) preparing multifunctional hydrophilic polyester fiber according to the patent name of Chinese patent application No. 201210465606.3, wherein the patent name of the invention is the preparation method of the multifunctional hydrophilic polyester fiber, and the preparation method comprises the following steps: mixing terephthalic acid and ethylene glycol to prepare slurry, adding the slurry into an esterification reactor for esterification, adding sorbitol for second esterification when the yield of byproducts reaches 82-95% of a theoretical value, and performing polycondensation after the esterification is complete to prepare hydrophilic polyester chips. Then preparing nano coffee carbon powder, preparing nano bamboo charcoal powder containing an anti-ultraviolet agent, respectively blending the two powders with hydrophilic polyester to prepare functional master batches, and finally spinning the functional master batches and the hydrophilic polyester to obtain the multifunctional hydrophilic polyester fiber. The hydrophilic polyester fiber prepared by the method also has the functions of ultraviolet resistance and bamboo charcoal resistance. However, the multifunctional hydrophilic polyester fiber prepared by the invention is prepared by simple hydrophilic modification synthesis and then blending with the functional master batch, and has no biodegradable performance.

The invention discloses a Chinese patent application number 201410546019.6, which relates to a cellulose nanocrystal modified hydrophilic polyester fiber and a preparation method thereof, and discloses a cellulose nanocrystal modified hydrophilic polyester fiber and a preparation method thereof. The preparation method comprises the following steps: mixing the water suspension of the cellulose nanocrystal with 75-85 wt% of ethylene glycol, removing water in the mixed solution to prepare an ethylene glycol suspension of the cellulose nanocrystal, then preparing the suspension of the cellulose nanocrystal and terephthalic acid into mixed slurry, adding a catalyst and a heat stabilizer, and heating for primary esterification; then adding polyhydroxy alcohol to carry out secondary esterification, finally carrying out polycondensation to obtain hydrophilic polyester chips, and carrying out melt spinning to obtain the modified hydrophilic polyester fiber. However, the hydrophilic polyester fiber prepared by the method also has no biodegradable function.

Disclosure of Invention

The purpose of the invention is as follows: the first object of the present invention is to provide a degradable hydrophilic polyester fiber having good biocompatibility, biodegradability and hydrophilicity, and the second object of the present invention is to provide a method for preparing the degradable hydrophilic polyester fiber.

The technical scheme is as follows: the main chain of the degradable hydrophilic polyester fiber is embedded with a lactic acid molecular chain segment which is terminated by polyethylene glycol; the polyethylene glycol is one of PEG100, PEG200, PEG300, PEG400, PEG500, PEG600, PEG700, PEG800, PEG900 or PEG1000, wherein the mass ratio of the polyester to the lactic acid terminated by the polyethylene glycol is 0.5-0.95: 0.05 to 0.5.

The preparation method of the degradable hydrophilic polyester fiber comprises the following steps:

(1) preparing terephthalic acid, diol, a first catalyst and a stabilizer into polymerization slurry, and performing one-step esterification to obtain a polyester prepolymer, wherein the molar ratio of the terephthalic acid to the diol to the first catalyst to the stabilizer is 1: 1.18 to 2: 0.0005 to 0.5: 0.0005 to 0.55;

(2) drying lactic acid at the temperature of 60-110 ℃ and the vacuum degree of 10-350Pa, adding a second catalyst, and performing prepolymerization in a nitrogen environment to obtain a polylactic acid prepolymer, wherein the molar ratio of the lactic acid to the second catalyst is 1: 0.001 to 0.05;

(3) adding polyethylene glycol into the polylactic acid prepolymer for hydroxyl end capping to prepare a polylactic acid oligomer end capped by polyethylene glycol, wherein the mass ratio of the polylactic acid prepolymer to the polyethylene glycol is 1: 0.001 to 0.5;

(3) mixing the polyester prepolymer with a polylactic acid oligomer, and carrying out vacuum polycondensation to prepare degradable hydrophilic polyester;

(4) and drying the degradable hydrophilic polyester, and carrying out melt spinning to obtain the degradable hydrophilic polyester fiber.

In the esterification process, a certain proportion of LA molecules are added, compared with the conventional polyester macromolecular chain segment, the proportion of ester groups is increased and the hydrophilicity of macromolecules is increased at the same molar content of esterified micromolecules; the low molecular polylactic acid oligomer is terminated by PEG, and then is polycondensed with the polyester prepolymer, so that the LA chain segment can be grafted to the main chain of the polyester, which is different from the blending of common polyester and PLA, and the problem of poor compatibility of the two is solved.

Preferably, the viscosity of the degradable hydrophilic polyester is 0.55-0.75.

Preferably, the spinning assembly is one of a single-component round type, a triangular type, a Y-shaped type, a T-shaped type, an 8-shaped type and a hollow type.

Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: through the method of adding PEG and LA in batches for multiple times and carrying out multi-step esterification, the fragments of the PEG and LA monomers in the polyester chain segment can be effectively prevented from imploding, so that the PEG and LA are dispersed in the chain segment more uniformly; in the polyester polycondensation process, a certain proportion of PEG-terminated low-molecular polylactic acid oligomer is added, so that the prepared polyester has certain biocompatibility and biodegradability; in the polyester polycondensation process, the low molecular weight polylactic acid oligomer with the end capping of PEG and hydrophilic PEG are added, so that the prepared polyester has good hydrophilic performance.

Drawings

FIG. 1 is a contact angle test of a comparative example conventional polyester;

fig. 2 is a contact angle test of the degradable hydrophilic polyester of the present invention.

Detailed Description

The technical solution of the present invention is further illustrated by the following examples.

Example 1

Weighing 1mol of PTA, 1.18mol of EG, 0.0005mol of antimony trioxide and 0.0005mol of triphenyl phosphate, putting the materials into a reaction kettle, controlling the pressure in the kettle to be 0.2MPa, keeping the temperature at 240 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.001mol of stannous chloride into another reaction kettle for polymerization, controlling the polymerization temperature at 130 ℃ and the polymerization time at 0.5 hour, then adding 0.001mol of PEG with the polymerization degree of 100 for end capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of the polyethylene glycol and the acetic acid molecule is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.95:0.05, wherein the polycondensation temperature is 230 ℃ and the polycondensation time is 10 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a single-component circular spinneret plate at the spinning temperature of 250 ℃.

Example 2

Weighing 1mol of PTA, 1.3mol of propylene glycol, 0.001mol of tetraisobutyl titanate and 0.001mol of triphenyl phosphite, placing the materials into a reaction kettle, controlling the pressure in the kettle to be 0.3MPa, keeping the temperature at 250 ℃, and esterifying for the period of time; drying lactic acid at 110 ℃ and the vacuum degree of 350Pa, adding dried 1mol of LA and 0.005mol of stannous chloride into another reaction kettle, polymerizing, controlling the polymerization temperature at 110 ℃ and the polymerization time at 1 hour, adding 0.005mol of PEG with the polymerization degree of 200, and performing end-capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.9:0.1, wherein the polycondensation temperature is 240 ℃ and the polycondensation time is 8 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.65. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a triangular microporous spinneret plate at the spinning temperature of 260 ℃.

Example 3

Weighing 1mol of PTA, 1.4mol of butanediol, 0.005mol of antimony triacetate and 0.005mol of diphenyl phosphate, placing the materials in a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 80 ℃ and under the condition that the vacuum degree is 150Pa, then adding dried 1mol of LA and 0.01mol of stannous chloride into another reaction kettle, polymerizing, controlling the polymerization temperature at 150 ℃ and the polymerization time at 2 hours, then adding 0.05mol of PEG with the polymerization degree of 900, and carrying out end-capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.7:0.3, wherein the polycondensation temperature is 260 ℃ and the polycondensation time is 6 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.75. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a Y-shaped spinneret plate at the spinning temperature of 270 ℃.

Example 4

Weighing 1mol of PTA, 1.5mol of EG, 0.01mol of antimony trioxide and 0.01mol of triphenyl phosphate, placing the materials into a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.02mol of stannous octoate into another reaction kettle, polymerizing, controlling the polymerization temperature at 130 ℃ and the polymerization time at 1 hour, then adding 0.01mol of PEG with the polymerization degree of 300 to carry out end-capping polymerization, thus obtaining a PEG-capped polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.8:0.2, wherein the polycondensation temperature is 250 ℃, and the polycondensation time is 7 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a T-shaped spinneret plate at the spinning temperature of 265 ℃.

Example 5

Weighing 1mol of PTA, 1.6mol of propylene glycol, 0.03mol of tetraisopropyl titanate and 0.03mol of triphenyl phosphate, placing the materials into a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.03mol of stannous octoate into another reaction kettle for polymerization, controlling the polymerization temperature at 130 ℃ and the polymerization time at 1.5 hours, then adding 0.05mol of PEG with the polymerization degree of 400 for end capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.7:0.3, wherein the polycondensation temperature is 260 ℃ and the polycondensation time is 6 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting an 8-shaped spinneret plate at the spinning temperature of 270 ℃.

Example 6

Weighing 1mol of PTA, 1.7mol of butanediol, 0.05mol of stannous oxalate and 0.05mol of triphenyl phosphate, placing the materials in a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.04mol of stannous octoate into another reaction kettle, polymerizing, controlling the polymerization temperature at 130 ℃ and the polymerization time at 2 hours, then adding 0.1mol of PEG with the polymerization degree of 500 for end-capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.6:0.4, wherein the polycondensation temperature is 260 ℃ and the polycondensation time is 5 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a cross spinneret plate at the spinning temperature of 275 ℃.

Example 7

Weighing 1mol of PTA, 1.8mol of EG, 0.07mol of antimony disulfide and 0.07mol of triphenyl phosphate, placing the materials into a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.05mol of yttrium oxide into another reaction kettle, polymerizing, controlling the polymerization temperature at 130 ℃ and the polymerization time at 2.5 hours, then adding 0.2mol of PEG with the polymerization degree of 600 for end-capping polymerization to obtain a PEG-end-capped polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.5:0.5, wherein the polycondensation temperature is 260 ℃ and the polycondensation time is 4 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a 3C hollow spinneret plate at the spinning temperature of 280 ℃.

Example 8

Weighing 1mol of PTA, 1.9mol of EG, 0.09mol of antimony disulfide and 0.09mol of triphenyl phosphate, placing the materials into a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.05mol of yttrium oxide into another reaction kettle, polymerizing, controlling the polymerization temperature at 130 ℃ and the polymerization time at 3 hours, then adding 0.3mol of PEG with the polymerization degree of 700 for end-capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.5:0.5, wherein the polycondensation temperature is 280 ℃ and the polycondensation time is 1 hour, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a single C hollow spinneret plate at the spinning temperature of 285 ℃.

Example 9

Weighing 1mol of PTA, 1mol of EG, 1mol of propylene glycol, 0.1mol of antimony disulfide and 0.1mol of triphenyl phosphate, placing the materials into a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.05mol of yttrium oxide into another reaction kettle, polymerizing, controlling the polymerization temperature at 130 ℃ and the polymerization time at 3 hours, then adding 0.4mol of PEG with the polymerization degree of 800, and carrying out end-capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.5:0.5, wherein the polycondensation temperature is 260 ℃ and the polycondensation time is 2 hours, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a single-component circular spinneret plate at the spinning temperature of 290 ℃.

Example 10

Weighing 1mol of PTA, 2mol of EG, 0.5mol of antimony disulfide and 0.55mol of triphenyl phosphate, placing the materials into a reaction kettle, controlling the pressure in the kettle to be 0.4MPa, keeping the temperature at 255 ℃, and esterifying for the period of time; drying lactic acid at 60 ℃ under the condition that the vacuum degree is 10Pa, then adding dried 1mol of LA and 0.05mol of yttrium oxide into another reaction kettle, polymerizing, controlling the polymerization temperature at 130 ℃ and the polymerization time at 3 hours, then adding 0.5mol of PEG with the polymerization degree of 1000 for end-capping polymerization to obtain a PEG-terminated polylactic acid oligomer, wherein the block mode of polyethylene glycol and acetic acid molecules is a random block; and performing polycondensation on the prepared polyester prepolymer and a PEG-terminated PLA oligomer, and performing mixed polycondensation according to the mass ratio of 0.5:0.5, wherein the polycondensation temperature is 260 ℃ and the polycondensation time is 1 hour, so as to prepare the degradable hydrophilic polyester, and the viscosity of the degradable hydrophilic polyester is 0.55. And carrying out melt spinning on the obtained degradable hydrophilic polyester, and preparing the degradable hydrophilic polyester fiber by adopting a single-component circular spinneret plate at the spinning temperature of 220 ℃.

The fiber sample of the embodiment and a blank sample of the single-component round polyester non-woven fabric with the same specification are used for performance characterization, and the performance characterization comprises the following steps:

1. and (3) testing the contact angle of the hydrophilic polyester, and referring to the detection and evaluation of the antifouling performance of the textile of national standard GB/T30159.1-2013 part 1, namely, testing the antifouling performance.

2. According to the standard method for detecting biodegradability of GB/T19277.1-2011, a sample material and compost inoculum are mixed and then put into a composting container, sufficient composting is carried out under the conditions of certain oxygen, humidity (50-55%) and temperature (58+2 ℃), and CO is detected after the test material is degraded for 45 days₂Released amount of actual CO₂The ratio of the release amount to the theoretical maximum release amount represents the biodegradation rate of the material. The detection reference substance is cellulose with the particle size of less than 20um, and the limited test is carried out when the degradation rate of the reference substance is more than 70% after 45 days.

3. The tensile strength of the hydrophilic polyester fiber is tested by referring to a standard national standard GB/T14337-2008 chemical fiber short fiber tensile property test method.

FIG. 1 is a contact angle test of a conventional polyester/fiber, and FIG. 2 is a contact angle test of a degradable hydrophilic polyester according to the present invention, and the results are shown below:

the results show that the hydrophilic polyester and the hydrophilic polyester fiber prepared by the method have good hydrophilicity, excellent biodegradability and high mechanical property, and can be used for preparing functional textiles with moisture absorption and sweat releasing, the field of biomedical materials and the like.