CN110983480B

CN110983480B - Composite polyester and preparation method thereof

Info

Publication number: CN110983480B
Application number: CN201911318673.0A
Authority: CN
Inventors: 赖宇坤; 叶介茂; 劳作恬
Original assignee: Anta China Co Ltd
Current assignee: Anta China Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2022-07-12
Anticipated expiration: 2039-12-19
Also published as: CN110983480A

Abstract

A composite polyester fiber and a preparation method thereof are disclosed, the composite polyester fiber comprises a fiber body and microcapsules uniformly formed in the fiber body; the microcapsule comprises a microcapsule core material and a microcapsule wall material coated outside the microcapsule core material; the microcapsule core material comprises the following components in percentage by weight: 20-40 wt% of dacron enzyme bacteria, 10-60 wt% of vegetable sesame oil and 10-20 wt% of sucrose ester; the dacron enzyme bacteria can be metabolized to generate dacron enzyme; the microcapsule wall material is edible natural polymer material. The preparation method of the composite terylene comprises the following steps of preparing microcapsule wall material hydrosol, preparing dacron enzyme bacteria, preparing microcapsule core material water emulsion, preparing microcapsules and preparing terylene. The stability of the microcapsules in the composite polyester obtained by the technical scheme in the fiber body is good, and the composite polyester product can attract microorganisms in the environment to eat the microfibers after being discarded, so that the problem that potential hazards of ecological environment are caused due to the fact that the polyester cannot be degraded is solved.

Description

Composite polyester and preparation method thereof

Technical Field

The invention relates to the technical field of terylene, in particular to composite terylene and a preparation method thereof.

Background

PET fiber, namely PET (polyethylene terephthalate), is the most widely used polyester microfiber at present, fiber raw materials used in the present production are all from petrochemical production, the consumption rate of resources is high, a large amount of waste clothes are generated and directly discarded in the natural environment every year, most of the waste clothes are directly buried in soil, but the traditional polyester microfiber is natural inert fiber and can be degraded in the soil for two to three hundred years, the nondegradable polyester microfiber can greatly harm the ecological environment, the nondegradable polyester microfiber in the soil can gradually flow into oceans occupying 71% of the global area along with the impact of rainwater and rivers, and if marine organisms eat the microfiber, the microfiber can be remained in the stomach of the oceans and can generate wrong satiety of the oceans, thus, the vitality of marine organisms is severely affected. In addition, the microfibers affect marine organisms at a cellular level, causing cell damage and inflammation, and if the contaminated organisms are put on the table, the microfibers enter the human body, which has a great influence on the health of the human body.

Disclosure of Invention

The composite terylene obtained by the technical scheme has good stability of microcapsules for playing a biodegradation role in a fiber body, and the composite terylene product can attract microorganisms in the environment to eat microfibers after being discarded, so that the problem that potential hazards harmful to the ecological environment exist due to the incapability of degrading the terylene is solved.

In order to achieve the purpose, the following technical scheme is adopted:

the composite polyester comprises a fiber body and microcapsules uniformly formed in the fiber body; the microcapsule comprises a microcapsule core material and a microcapsule wall material coated outside the microcapsule core material; the microcapsule core material comprises the following components in percentage by weight: 20-40 wt% of dacron enzyme bacteria, 10-60 wt% of vegetable sesame oil and 10-20 wt% of sucrose ester; the dacron enzyme bacteria can be metabolized to produce dacron enzyme; the microcapsule wall material is edible natural polymer material.

Further, the dacron enzyme bacteria include probiotics, bifidobacteria, lactobacilli, aerobic bacteria, escherichia coli and anaerobic bacteria.

Further, the bacterial concentration of each bacterium in the dacron enzyme bacterium is as follows: probiotic is more than or equal to 1.07 x 10⁹CFU/mL, Bifidobacterium of 4.36 × 10 or more⁸CFU/mL, Lactobacillus ≥ 2.36 x 10⁸CFU/mL, aerobic 3.42 x 10⁹CFU/mL, E.coli ≥ 2.16 10⁸CFU/mL, 6.45X 10 anaerobe⁹CFU/mL。

Further, the natural polymer material is any one or a mixture of several of animal glue, plant glue and marine product glue.

Further, the animal glue is any one of bone glue, pigskin glue and oxhide glue; the vegetable gum is any one of Arabic gum and peach gum; the marine gelatin is any one of alginic acid, sodium alginate and laver gelatin.

Further, the microcapsules are compounded in the fiber body through an in-situ polymerization method.

The preparation method of the composite polyester fiber is used for preparing the composite polyester fiber, and comprises the following steps:

preparing microcapsule wall material hydrosol: stirring and dissolving edible natural polymer materials in hot water, cooling to room temperature, and filtering insoluble substances to obtain microcapsule wall material hydrosol;

preparing dacron enzyme bacteria: stirring and mixing probiotics, bifidobacteria, lactobacillus, aerobic bacteria, escherichia coli and anaerobic bacteria with certain bacteria concentration at high speed, and centrifuging to obtain supernatant; ultrafiltering the supernatant to obtain concentrated solution; adding a divalent cobalt salt, an ammonium sulfate solution and LX-1000EP (C) epoxy resin into the concentrated solution for fixing for a period of time, and then carrying out suction filtration to obtain a filter cake; washing the filter cake with distilled water for three times, placing the filter cake in a phosphate buffer solution, adding phenylacetic acid and glycerol, preserving the temperature at normal temperature, and performing suction filtration to obtain a filter cake; washing the filter cake with distilled water for three times, and finally, preserving heat in a glycine solution at normal temperature to obtain the immobilized dacron enzyme bacteria;

preparing a microcapsule core material water emulsion: heating and stirring 20-40 wt% of dacron enzyme bacteria and 10-60 wt% of plant sesame oil, and mixing completely; adding 1-20 wt% of sucrose ester, and continuously stirring until the sucrose ester is fully mixed; adding deionized water, and treating by adopting a high-speed shearing emulsifying machine to obtain microcapsule core material water emulsion;

preparing microcapsules: stirring the microcapsule wall material hydrosol and the microcapsule core material aqueous emulsion at a high speed to enable the microcapsule wall material to fully wrap the microcapsule core material, dropwise adding a calcium chloride aqueous solution under low-speed stirring, and reacting at a constant temperature for 1-20h to obtain microcapsules;

preparing terylene: heating, stirring and melting the PET fragments to obtain initial reaction stock solution of the PET chips; mixing the initial reaction stock solution of the PET slices with the microcapsules and obtaining the PET slices by adopting an in-situ polymerization method; and spinning the PET chips through a melt spinning process to obtain the PET fibers.

Further, in the step of preparing the microcapsule wall material hydrosol, the temperature of hot water for dissolving the natural polymer material is 70-100 ℃; the stirring speed is 150-200 r/min; stirring and dissolving the natural high polymer material in hot water, and then stirring at constant temperature for a period of time; stirring at constant temperature of 50-75 deg.C; the stirring time at constant temperature is 1-12 h.

Further, in the step of preparing the dacron enzyme bacteria, the final concentration of the divalent cobalt salt is 0.4-0.6 g/L; the concentration of the ammonium sulfate solution is 2.8-3.5g/L, and the adding volume of the ammonium sulfate solution is equal to the volume of the concentrated solution; LX-1000EP (C) 1/5 of concentrated solution of epoxy resin addition volume; the pH of the phosphate buffer solution is 9.5, and the concentration of the phosphate buffer solution is 100 mg/L; the concentration of the phenylacetic acid is 10g/L, and the addition amount of the phenylacetic acid is 100 mL; the mass concentration of the glycerol is 20 percent; the PH value of the glycine solution is 8.5, and the heat preservation time at the normal temperature for the first time is at least 72 hours; the time for holding at the normal temperature for the second time is at least 24 hours.

Further, the plant sesame oil is one or a mixture of more of sesame oil, castor oil and sesame oil.

Further, in the step of preparing the microcapsule core material water emulsion, the stirring rotating speed is 200-350 r/min; mixing dacron enzyme bacteria and plant sesame oil, heating at 45-80 deg.C for dissolving, and stirring for at least 10 min; after sucrose ester is added, the mixed solution is continuously stirred for at least 20min at the temperature of 45-80 ℃; the addition amount of deionized water was 100-200 mL.

Further, in the step of preparing the microcapsule, the rotating speed of high-speed stirring is 700-; the rotating speed of the low-speed stirring is 200-; the concentration of the calcium chloride aqueous solution is 0.1-0.8%.

Further, in the step of preparing the terylene, the PET fragments are formed by cleaning and crushing recycled PET plastic products.

Further, in the step of preparing the terylene, the obtaining of the PET slices comprises the following reaction processes: carrying out esterification reaction in an esterification kettle for 2-5h under the pressure of 0.2-0.5 MPa; pre-polycondensation polymerization is carried out for 1-2h at the normal pressure of 260 ℃ and 290 ℃; the post-polycondensation reaction is carried out for 1-2h under the vacuum environment of 270-310 ℃.

Compared with the prior art, the scheme has the following beneficial effects:

1. in the technical scheme of the invention, the microcapsules are uniformly formed in the fiber body and are not attached to the surface of the fiber body, so that the content of the microcapsules cannot be reduced or damaged in the wearing and repeated washing processes of a textile product made of the composite polyester, and the required functions are more stable and reliable; the existence of the plant sesame oil in the microcapsule enables the textile made of the composite polyester to release fragrance and attract bacteria in soil to bite and break the yarn when the textile is abandoned and buried in the ground, meanwhile, in the process of biting and eating the yarn, when the wall material of the microcapsule is bitten and broken, the microcapsule can release dactylase bacteria in the microcapsule, dactylase generated by the metabolism of the dactylase bacteria can attack ester bonds in macromolecules of a polyester fiber body, micromolecule monomers such as terephthalic acid and the like are formed after the ester bonds are broken and are decomposed into carbon dioxide and water in the soil under the action of other bacterial microorganisms, and part of the ester bonds of the polyester fibers which are not decomposed by the dactylase, and because edible polysaccharide exists in the wall material of the microcapsule, the polysaccharide can still attract the microorganisms to bite and digest the polyester, can be degraded by microorganisms after being discarded, ensures that the polyester product can not cause pollution and damage to the ecological environment after being discarded, and avoids the influence on the human health.

2. The dacron enzyme bacteria are formed by probiotics, bifidobacteria, lactobacillus, aerobic bacteria, escherichia coli and anaerobic bacteria, so that the dacron enzyme bacteria can be metabolized to generate dacron enzyme, and the using effect is better.

3. Any one or a mixture of more of animal glue, vegetable glue and marine product glue is used as the microcapsule wall material, so that the coating effect on the microcapsule core material is good, the material is easy to obtain, and the cost is low.

4. The microcapsules are compounded in the fiber body through an in-situ polymerization method, so that the microcapsules can uniformly and stably exist in the fiber body, the microcapsules are uniformly distributed, the fiber body in the waste polyester product can attract microorganisms to bite the microorganisms uniformly, and the degradation effect is better; the microcapsules exist in the limiting body, so that the content of the microcapsules cannot be reduced or damaged in the process of wearing and repeated washing of textile products made of the composite terylene, and the function of the microcapsules for attracting microorganisms to bite the microorganisms, which is required to be exerted, is more stable and reliable.

5. According to the composite polyester provided by the technical scheme, the edible natural polymer material is adopted to coat the dacron enzyme bacteria and the plant sesame oil to prepare the microcapsule, and the dacron enzyme bacteria and the plant sesame oil improve the high-temperature resistance under the protection of the microcapsule wall material, so that the dacron fiber compounded with the microcapsule can release fragrance and attract bacteria to degrade the dacron fiber only by being buried in soil.

6. In the preparation method of the composite polyester, when the microcapsule is prepared, the calcium chloride aqueous solution is dropwise added to adjust the molecular gap of the wall material of the microcapsule, so that the sealing performance of the microcapsule is improved, and the wall material of the microcapsule can well inhibit the volatility of the plant sesame oil.

7. When preparing dacron enzyme bacteria, divalent cobalt salt, ammonium sulfate solution and LX-1000EP (C) epoxy resin are adopted to fix the bacteria, so that the stability of the microcapsule core material water emulsion is improved, and the microcapsules are more easily coated by microcapsule wall material hydrosol.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are the test results of the embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a comparison of the degradation conditions of a composite polyester fabric and a conventional polyester fabric in an embodiment of the invention;

FIG. 2 is a second comparison of the degradation conditions of the composite polyester fabric and the conventional polyester fabric in the embodiment of the invention.

Detailed Description

In the claims and the specification, unless otherwise defined, the terms "first," "second," or "third," etc., are used to distinguish one object from another, and are not used to describe a particular order.

In the claims and specification, unless otherwise defined, the terms "comprising", "having" and variations thereof mean "including but not limited to".

Example of composite polyester

The embodiment of the invention provides a composite polyester, which comprises a fiber body and microcapsules uniformly formed in the fiber body, wherein the microcapsules are compounded in the fiber body through an in-situ polymerization method; the microcapsule comprises a microcapsule core material and a microcapsule wall material coated outside the microcapsule core material;

the microcapsule core material comprises the following components in percentage by weight: 20-40 wt% of dacron enzyme bacteria, 10-60 wt% of vegetable sesame oil and 10-20 wt% of sucrose ester; the dacron enzyme bacteria can metabolize to produce dacron enzyme, and the dacron enzyme bacteria provided by the embodiment comprise the following bacterial species and bacterial concentrations of various bacteria: probiotic is more than or equal to 1.07 x 10⁹CFU/mL, Bifidobacterium of 4.36 × 10 or more⁸CFU/mL, Lactobacillus ≥ 2.36 x 10⁸CFU/mL, aerobic 3.42 x 10⁹CFU/mL, Escherichia coli ≥ 2.16 x 10⁸CFU/mL, 6.45 x 10 anaerobe⁹CFU/mL. The plant sesame oil is one or more of sesame oil, castor oil and sesame oil.

The microcapsule wall material is edible natural polymer material, and is any one or mixture of animal gelatin, plant gelatin and marine product gelatin; wherein the animal glue is any one of bone glue, pigskin glue and oxhide glue; the vegetable gum is any one of Arabic gum and peach gum; the marine gelatin is one of alginic acid, sodium alginate and laver gelatin.

Preparation method embodiment of composite polyester

The embodiment of the invention provides a preparation method of composite terylene, which is used for preparing the composite terylene and specifically comprises the following steps:

preparing microcapsule wall material hydrosol: stirring and dissolving the edible natural polymer material in hot water, cooling to room temperature, and filtering insoluble substances to obtain the microcapsule wall material hydrosol. Specifically, edible natural polymer materials are stirred and dissolved in hot water at 70-100 ℃, stirring is usually carried out in a stirrer, the stirring speed is 150-.

Preparing dacron enzyme bacteria: the probiotics is more than or equal to 1.07 x 10⁹CFU/mL, Bifidobacterium greater than or equal to 4.36 x 10⁸CFU/mL, Lactobacillus ≥ 2.36 x 10⁸CFU/mL, aerobic 3.42 x 10⁹CFU/mL, E.coli ≥ 2.16 10⁸CFU/mL, 6.45X 10 anaerobe⁹Stirring CFU/mL in a stirrer at high speed until the CFU/mL is uniformly mixed, and centrifuging to obtain a supernatant; ultrafiltering the supernatant to obtain concentrated solution; adding divalent cobalt salt with final concentration of 0.4-0.6g/L, ammonium sulfate solution with concentration of 2.8-3.5g/L and volume of 1/5 LX-1000EP (C) epoxy resin with volume of concentrated solution into the concentrated solution, fixing for a period of time, and performing suction filtration to obtain a filter cake; washing the filter cake with distilled water for three times, placing the filter cake in a phosphate buffer solution with the pH of 9.5 and the concentration of 100mg/L, adding 100mL of phenylacetic acid with the concentration of 10g/L and 20% of glycerol, preserving the temperature for at least 72 hours at normal temperature, and then carrying out suction filtration to obtain the filter cake; and washing the filter cake for three times by using distilled water, and finally, preserving the heat for at least 24 hours at normal temperature in a glycine solution with the pH of 8.5 to obtain the immobilized dacryinase bacteria. The final concentration of the selected divalent cobalt salt in this example was 0.5g/L, and the concentration of ammonium sulfate was 3.0 g/L.

Preparing a microcapsule core material water emulsion: heating and dissolving 20-40 wt% of dacron enzyme bacteria and 10-60 wt% of plant sesame oil at 45-80 ℃, and fully mixing at least 10min under the condition that the rotating speed is 200-350 r/min; adding 1-20 wt% of sucrose ester, and continuously stirring at 45-80 deg.C for at least 20min to mix thoroughly; adding 100-200mL deionized water, and treating by adopting a high-speed shearing emulsifying machine to obtain the microcapsule core material water emulsion. Wherein the vegetable sesame oil is one or more of sesame oil, castor oil and sesame oil. In the embodiment, 30 wt% of dacron enzyme bacteria and 50 wt% of plant sesame oil are heated and dissolved at 50 ℃, the stirring speed of a stirrer is 300r/min, the stirring time is 20min, 20 wt% of sucrose ester is added, the stirring is continued at 60 ℃ for at least 30min until the mixture is fully mixed, and the amount of the added deionized water is 180 mL.

Preparing microcapsules: stirring the microcapsule wall material hydrosol and the microcapsule core material water emulsion at a high speed under the condition of the rotating speed of 700 plus 900r/min to ensure that the microcapsule wall material fully wraps the microcapsule core material, then dripping the calcium chloride aqueous solution with the concentration of 0.1-0.8 percent under the low-speed stirring at the rotating speed of 200 plus 260r/min, and reacting at constant temperature for 1-20h to obtain the microcapsule.

Preparing terylene: heating, stirring and melting the PET fragments to obtain initial reaction stock solution of the PET slices; mixing the initial reaction stock solution of the PET slices with the microcapsules and obtaining the PET slices by adopting an in-situ polymerization method; and spinning the PET chips through a melt spinning process to obtain the PET fibers. Wherein, the PET fragments are formed by cleaning and crushing recycled PET plastic products.

Specifically, the specific steps for preparing the terylene are as follows:

step 1: pretreatment: carrying out primary screening and primary cleaning on the PET bottle, then crushing into 18 mm PET bottle chips, carrying out drying treatment on the PET bottle chips after passing through a cleaning assembly line, and finally carrying out color separation through infrared color separation equipment to obtain PET fragments.

Step 2: preparing a PET slice: pressing the cut and dried PET fragments into an esterification kettle, adding the prepared microcapsules under the protection of nitrogen at normal pressure, and carrying out esterification reaction in the esterification kettle for 2-5h under the pressure of 0.2-0.5 MPa; pre-polycondensation polymerization is carried out for 1-2h at the normal pressure of 260 ℃ and 290 ℃; then carrying out post-polycondensation reaction for 1-2h under the vacuum environment of 270-310 ℃ to obtain the PET slice. In the embodiment, the selected pressure is 0.3MPa, the esterification reaction time is 4h, the reaction temperature of the selected pre-polycondensation polymerization is 280 ℃, and the polymerization time is 1.5 h; the temperature of the postcondensation reaction was 280 ℃ and the reaction time was 1.8 h.

And step 3: preparing polyester fiber: adding PET slices from a polymer hopper, and sequentially melting, mixing, metering and extruding by using a screw extruder which is heated in sections according to requirements to obtain a melt; the melt is sent into a melt metering pump through a bent pipe between the extruder and the spinning box body, and the melt is quantitatively extruded by the metering pump through small holes with a spinning nozzle to form melt trickle; after entering the channel, the melt trickle is cooled and solidified at a lower temperature (40 ℃) in a cooling and blowing environment to form nascent fiber; the nascent fiber is subjected to oiling and networking and then is wound into a bobbin; and the coiled filament is subjected to secondary forming processing such as subsequent stretching, heat setting and the like to prepare the polyester fiber compounded with the microcapsules.

The finally obtained polyester fiber meets the technical indexes of 75D/36F filaments: the dry breaking strength is 4.64CN/dtex, the wet breaking strength is 2.35CN/dtex, the whiteness is 85 percent, and the oil content is 0.32 percent.

The comfort degree of the polyester fiber provided by the embodiment of the invention is not affected after the polyester fiber is used for manufacturing products, and the polyester fiber has complete degradability.

In order to further understand the present application, the fully degradable composite polyester and the preparation method thereof provided by the present invention are specifically described below with reference to specific polyester fiber product examples.

Embodiment of composite polyester textile fabric

1. The weaving process comprises the following steps:

1.1 device parameters

2+4 common double-sided rounding machine;

machine number 24 needles/25.4 mm;

barrel diameter 863.6mm (34 ");

lane number 72F.

1.2 raw material specification

75D composite polyester filament yarn fiber and bi-component environment-friendly composite polyester filament yarn (prepared by the above embodiment).

1.3 knitting needle arrangement

The knitting needle arrangement is arranged according to the method for knitting interlock texture (interlock fabric).

I.e. the dial is arranged in order AB and the needle cylinder is arranged in order BA. Adopts cotton wool for alignment.

1.4 triangular arrangement

The triangular arrangement is shown in Table 1, with a total of 10F being a complete structure. Wherein, the No. 2, No. 4, No. 5, No. 7, No. 9 and No. 10 are threaded with cotton yarns, and the No. 1, No. 3, No. 6 and No. 8 are threaded with bi-component environment-friendly composite polyester filament yarns.

TABLE 1 triangular arrangement

2. The dyeing process comprises the following steps:

the bath ratio is l:30, temperature is 110 deg.C, and time is 50 min.

3. Fabric parameters are as follows:

the gram weight of the blank cloth is 225g/m2, the breadth is 1560mm, and the content of the composite PET fiber is 100%.

4. And (3) physical index testing:

the composite polyester filament yarn product prepared by the embodiment and the existing polyester filament yarn product are respectively woven into 32S polyester plain cloth, the degradation rate index of the fabric is tested, and the test results are shown in Table 2.

TABLE 2 degradation index comparison of the fabrics of this example

In addition, the embodiment of the invention also commissions the national plastic product inspection center to degrade according to the method according to GB/T19277.1-2011, the method is that two same fabrics are made into the left half part (the conventional terylene is dyed with the conventional terylene) and the right half part (the fully degradable composite terylene is dyed with white) of one piece of clothes, the left half part and the right half part (the fully degradable composite terylene is buried in soil, the complete degradation can be realized after about 200 days, the degradation test comparison pictures are described in figures 1 and 2, and the complete degradation of the clothes made of the composite terylene of the embodiment can be realized after about 200 days as can be known from figure 1.

In the embodiment of the invention, the microcapsules are uniformly formed in the fiber body and are not attached to the surface of the fiber body, so that the content of the microcapsules cannot be reduced or damaged in the process of wearing and repeated washing of a textile product made of the composite polyester, and the required functions are more stable and reliable; the existence of the plant sesame oil in the microcapsule enables the textile made of the composite polyester to release fragrance and attract bacteria in soil to bite and break the yarn when the textile is abandoned and buried in the ground, meanwhile, in the process of biting and eating the yarn, when the wall material of the microcapsule is bitten and broken, the microcapsule can release dactylase bacteria in the microcapsule, dactylase generated by the metabolism of the dactylase bacteria can attack ester bonds in macromolecules of a polyester fiber body, micromolecule monomers such as terephthalic acid and the like are formed after the ester bonds are broken and are decomposed into carbon dioxide and water in the soil under the action of other bacterial microorganisms, and part of the ester bonds of the polyester fibers which are not decomposed by the dactylase, and because edible polysaccharide exists in the wall material of the microcapsule, the polysaccharide can still attract the microorganisms to bite and digest the polyester, can be degraded by microorganisms after being discarded, ensures that the polyester product can not cause pollution and damage to the ecological environment after being discarded, and avoids the influence on the human health.

The description of the above specification and examples is intended to be illustrative of the scope of the present invention and is not intended to be limiting.

Claims

1. The composite polyester is characterized by comprising a fiber body and microcapsules uniformly formed in the fiber body; the microcapsule comprises a microcapsule core material and a microcapsule wall material coated outside the microcapsule core material; the microcapsule core material comprises the following components in percentage by weight: 20-40 wt% of dacron enzyme bacteria, 10-60 wt% of vegetable sesame oil and 10-20 wt% of sucrose ester; the dacron enzyme bacteria can metabolize to produce dacron enzyme, and comprise probiotics, bifidobacteria, lactobacillus, aerobic bacteria, escherichia coli and anaerobic bacteria, and the bacteria concentration of each bacteria in the dacron enzyme bacteriaComprises the following steps: probiotic is more than or equal to 1.07 x 10⁹CFU/mL, Bifidobacterium ≥ 4.36 x 10⁸CFU/mL, Lactobacillus ≥ 2.36 x 10⁸CFU/mL, aerobic 3.42 x 10⁹CFU/mL, E.coli ≥ 2.16 10⁸CFU/mL, 6.45X 10 anaerobe⁹CFU/mL; the microcapsule wall material is edible natural polymer material.

2. The composite polyester fiber of claim 1, wherein the natural polymer material is any one or more of animal glue, vegetable glue and marine glue.

3. The composite terylene according to claim 2, wherein the animal glue is any one of bone glue, pigskin glue and oxhide glue; the vegetable gum is any one of Arabic gum and peach gum; the marine gelatin is any one of alginic acid, sodium alginate and laver gelatin.

4. The composite polyester fiber of claim 1, wherein the microcapsule is compounded in the fiber body by in-situ polymerization.

5. A method for preparing composite polyester fiber, which is used for preparing the composite polyester fiber as claimed in any one of claims 1 to 4, and is characterized by comprising the following steps:

preparing dacron enzyme bacteria: the probiotics is more than or equal to 1.07 x 10⁹CFU/mL, Bifidobacterium ≥ 4.36 × 10⁸CFU/mL, Lactobacillus ≥ 2.36 x 10⁸CFU/mL, aerobic 3.42 x 10⁹CFU/mL, Escherichia coli ≥ 2.16 10⁸CFU/mL and anaerobe 6.45 10⁹CFU/mL is stirred and mixed at high speed, and supernatant fluid is obtained by centrifugation; ultrafiltering the supernatant to obtain concentrated solution; adding divalent cobalt salt, ammonium sulfate solution and LX-1000EP (C) epoxy resin into the above concentrated solutionPerforming suction filtration after a certain period of time, and obtaining a filter cake; washing the filter cake with distilled water for three times, placing the filter cake in a phosphate buffer solution, adding phenylacetic acid and glycerol, preserving the temperature at normal temperature, and performing suction filtration to obtain a filter cake; washing the filter cake with distilled water for three times, and finally, preserving heat in a glycine solution at normal temperature to obtain the immobilized dacron enzyme bacteria;

preparing terylene: heating, stirring and melting the PET fragments to obtain initial reaction stock solution of the PET slices; mixing the initial reaction stock solution of the PET slices with the microcapsules and obtaining the PET slices by adopting an in-situ polymerization method; and spinning the PET chips through a melt spinning process to obtain the PET fibers.

6. The method for preparing the composite terylene according to claim 5, wherein in the step of preparing the hydrosol of the microcapsule wall material, the temperature of the hot water for dissolving the natural polymer material is 70-100 ℃; the stirring speed is 150-200 r/min; stirring and dissolving the natural high polymer material in hot water, and then stirring at constant temperature for a period of time; stirring at constant temperature of 50-75 deg.C; the stirring time at constant temperature is 1-12 h.

7. The method for preparing composite terylene according to claim 5, wherein the natural polymer material is any one or a mixture of animal glue, plant glue and marine product glue.

8. The method for preparing composite terylene according to claim 5, wherein in the step of preparing the terylene enzyme bacteria, the final concentration of divalent cobalt salt is 0.4-0.6 g/L; the concentration of the ammonium sulfate solution is 2.8-3.5g/L, and the adding volume of the ammonium sulfate solution is equal to the volume of the concentrated solution; LX-1000EP (C) 1/5 of concentrated solution of epoxy resin addition volume; the pH of the phosphate buffer solution is 9.5, and the concentration of the phosphate buffer solution is 100 mg/L; the concentration of the phenylacetic acid is 10g/L, and the addition amount of the phenylacetic acid is 100 mL; the mass concentration of the glycerol is 20 percent; the PH value of the glycine solution is 8.5, and the heat preservation time at the normal temperature for the first time is at least 72 hours; the time of the second heat preservation at the normal temperature is at least 24 hours.

9. The method for preparing the composite terylene according to claim 5, wherein the bacteria concentration of each bacterium in the terylene enzyme bacteria is as follows: probiotic is more than or equal to 1.07 x 10⁹CFU/mL, Bifidobacterium of 4.36 × 10 or more⁸CFU/mL, Lactobacillus ≥ 2.36 x 10⁸CFU/mL, aerobic 3.42 x 10⁹CFU/mL, E.coli ≥ 2.16 10⁸CFU/mL, 6.45X 10 anaerobe⁹CFU/mL。

10. The method for preparing composite terylene according to claim 5, wherein the plant sesame oil is one or a mixture of sesame oil, castor oil and linseed oil.

11. The method for preparing composite terylene according to claim 5, wherein in the step of preparing the microcapsule core material water emulsion, the stirring rotation speed is 200-350 r/min; mixing dacron enzyme bacteria and plant sesame oil, heating at 45-80 deg.C for dissolving, and stirring for at least 10 min; after sucrose ester is added, the mixed solution is continuously stirred for at least 20min at the temperature of 45-80 ℃; the addition amount of deionized water was 100-200 mL.

12. The method for preparing composite terylene according to claim 5, wherein in the step of preparing the microcapsule, the rotation speed of high-speed stirring is 700-900 r/min; the rotating speed of the low-speed stirring is 200-; the concentration of the calcium chloride aqueous solution is 0.1-0.8%.

13. The method for preparing a composite polyester fiber as claimed in claim 5, wherein in the step of preparing the polyester fiber, the PET chips are obtained by cleaning and then pulverizing recycled PET plastic products.

14. The method for preparing composite terylene according to claim 5, wherein in the step of preparing terylene, the obtaining of PET chips comprises the following reaction processes:

carrying out esterification reaction in an esterification kettle for 2-5h under the pressure of 0.2-0.5 MPa;

pre-polycondensation polymerization is carried out for 1-2h at the normal pressure of 260 ℃ and 290 ℃;

the post-polycondensation reaction is carried out for 1-2h under the vacuum environment of 270-310 ℃.