CN111235681A - Emodin modified polyester filament yarn and preparation method thereof - Google Patents
Emodin modified polyester filament yarn and preparation method thereof Download PDFInfo
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- CN111235681A CN111235681A CN202010300819.5A CN202010300819A CN111235681A CN 111235681 A CN111235681 A CN 111235681A CN 202010300819 A CN202010300819 A CN 202010300819A CN 111235681 A CN111235681 A CN 111235681A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
- D01F1/103—Agents inhibiting growth of microorganisms
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- Artificial Filaments (AREA)
Abstract
The invention provides a method for preparing modified polyester filament yarn of emodin, contain emodin 0.1-5% in the polyester filament yarn, the preparation method of the polyester filament yarn includes the preparation of function modifier containing emodin, preparation, mixing and high-speed spinning of the compound modifier of emodin, modified polyester filament yarn of emodin prepared by the above-mentioned method, can reduce the attachment of the bacterium, the bacteriostatic rate to the bacterium such as the susceptible staphylococcus aureus of human body, colibacillus, Candida albicans reaches 95.0-98.5%; the breaking strength of the polyester filament yarn is 6.0-6.2cN/dtex, the breaking elongation is 38.5-40.0%, after the prepared polyester filament yarn fabric is washed by water for 50 times, the bacteriostasis rate is still above 95%, the tensile strength retention rate is above 98%, and the fiber has excellent washing resistance.
Description
Technical Field
The invention belongs to the technical field of fiber manufacturing, and particularly relates to an emodin modified polyester filament yarn and a preparation method thereof.
Background
The terylene is the commodity name of polyester fiber in China, is an important variety in synthetic fiber, is called as a new generation of synthetic fiber, has the characteristics of heat preservation, lightness, ventilation, close fitting, comfort, softness and the like, obtains the effect which is difficult to obtain by other fibers in the field of garment fabric, particularly obtains the terylene silk-like knitted fabric which has the advantages of moisture absorption and ventilation of real silk, comfortable wearing and the like, overcomes the defects of easy wrinkle, body sticking, poor fastness and the like of the real silk fabric, better endows the fabric with good extensibility, drapability and ventilation and is an excellent material for manufacturing outdoor articles such as sportswear, tents and the like.
The antibacterial environment-friendly polyester product is a hot tide of a new material, an inorganic or organic antibacterial agent is usually added in the prior art to prepare the polyester product with the antibacterial and mildewproof effects, but the inorganic or organic antibacterial agent has certain potential safety hazard, the antibacterial agent is easy to degrade and release, the antibacterial time is short, and the requirements of the public at present on healthy, environment-friendly and safe textiles are not met.
Emodin is added into the polyester chips to improve the natural antibacterial property of the polyester chips, and reports in the prior art are not found. In the process of carrying out related experiments, the applicant finds that emodin is directly added into a polyester material, organic substances are easy to carbonize to cause loss, the functionality of the polyester material is reduced, the attractiveness of fibers is affected, the defects of low fiber strength, easy breakage and the like frequently exist in the further processing process, and in addition, the prepared polyester fiber fabric is not resistant to washing and has poor fiber wear resistance.
Disclosure of Invention
In order to solve the problems in the prior art and further optimize the prior art, the invention provides an emodin modified polyester filament yarn and a preparation method thereof, so as to realize the following purposes:
1. the natural antibacterial effect is improved, and the antibacterial time is prolonged;
2. the mechanical strength of the reinforcing fiber;
3. enhance the wash durability of the fibers;
in order to solve the technical problems, the invention adopts the following technical scheme:
the preparation method of the emodin modified polyester filament yarn is characterized in that the polyester filament yarn contains 0.1 to 5 percent of emodin;
the preparation method of the polyester filament yarn comprises the steps of raw material selection, emodin-containing functional modifier preparation, emodin composite modifier preparation, mixing, high-speed spinning and post-treatment;
the raw materials are selected, the emodin is loose in powder, free of agglomeration and uniform and has orange long needle crystals; the content of the effective components is more than or equal to 98 percent, and the water content is less than or equal to 5 percent;
the emodin-containing functional modifier is prepared by the steps of preparing a bath ratio of activated montmorillonite in emodin dispersion liquid of 1: 5-10;
the particle size of the activated montmorillonite is 600-800 meshes, and the apparent viscosity is 155-160 mPa.s;
the preparation method of the activated montmorillonite comprises the steps of adding montmorillonite into a sulfuric acid solution for activation, sealing and heating to 60-65 ℃, and stirring for 8 hours;
the preparation method of the activated montmorillonite also comprises pre-sintering and sintering, wherein the pre-sintering comprises the steps of grinding montmorillonite particles into flour-shaped fine powder, and pre-sintering the flour-shaped fine powder in a box-type furnace at 300 ℃ for 2.5 to 3 hours; the sintering is carried out in a nitrogen atmosphere, the sintering temperature is 500-520 ℃, and the time is 5-6 h;
the emodin composite modifier is prepared by adding 20-25wt% of a mixed auxiliary agent, wherein the mass ratio of the mixed auxiliary agent to the alumina to the dolomite powder to the coconut monoethanolamide is 12-15:8-10: 2-3;
the emodin composite modifier is prepared by adding a fat-soluble promoter, wherein the mixing ratio of the fat-soluble promoter, span80 and n-butyl titanate is 0.2-0.4: 1; the addition amount of the accelerator accounts for 1-4wt% of the total amount;
the emodin composite modifier has a powder particle size of 500-700nm and a density of 2.0-2.3g/cm3；
Mixing, wherein the mixing mass ratio of the emodin-containing functional modifier to the common PET slices is 1: 5-10;
the high-speed spinning is carried out, the temperature of a spinning box body is 260-290 ℃, the rotating speed of a metering pump is 22-25r/min, and a spinneret hole is a Y-shaped hole;
the post-treatment is primary drawing, the drawing temperature is 180-190 ℃, the drawing multiple is 4.2-4.5 times, and the drawing speed is 12-13 m/min; the second drafting temperature is 100-120 ℃, the drafting multiple is 1.8-2.0 times, and the drafting speed is 3-4 m/min;
the post-treatment, heat setting 120-.
By adopting the technical scheme, the invention has the beneficial effects that:
1. by adopting the preparation method of the emodin modified polyester filament yarn, the prepared polyester filament yarn has excellent antibacterial effect, can reduce the attachment of bacteria, and has the bacteriostasis rate of 95.0-98.5% on staphylococcus aureus, escherichia coli, candida albicans and other bacteria which are susceptible to human bodies;
2. the emodin modified polyester filament yarn prepared by the preparation method has the advantages that the breaking strength is 6.0-6.2cN/dtex, the elongation at break is 38.5-40.0%, and the CV value of the elongation at break reaches 8.5-9.0%;
3. after the prepared polyester filament fabric is washed by water for 50 times by adopting the preparation method of the emodin modified polyester filament, the bacteriostasis rate is still over 95 percent, and the tensile strength retention rate is over 98 percent;
4. by adopting the preparation method of the emodin modified polyester filament yarn, the prepared polyester filament yarn has good water absorption and the water retention rate reaches 25-30%;
5. the emodin modified polyester filament yarn has uniform color, the light transmittance reaches 75-80%, and no obvious carbon black and particle agglomeration phenomenon can be seen by naked eyes;
the specific implementation mode is as follows:
the invention is further illustrated below with reference to specific examples.
Example 1 emodin modified polyester filament yarn and preparation method thereof
1. Selection of raw materials:
emodin, loose powder in appearance, no agglomeration, orange long needle crystal, and uniform; the content of active ingredients is 98 percent, and the water content is 4.5 percent;
2. the preparation of the emodin-containing functional modifier comprises the following steps:
adding proper amount of water into a beaker, and adding NaCO3After the solid is stirred and dissolved, adding emodin powder, and stirring until the emodin powder is completely dissolved to obtain an emodin dispersion liquid;
adding activated montmorillonite into emodin dispersion, stirring at 30r/min for 30min to make emodin enter into porous material to obtain nanometer composite material, separating, and drying to obtain emodin-containing functional modifier;
the concentration of the emodin in the emodin dispersion liquid is 15 wt%;
the emodin-containing functional modifier is prepared by the steps of preparing a bath ratio of activated montmorillonite in emodin dispersion liquid of 1: 5;
the activated montmorillonite has the granularity of 600 meshes and the apparent viscosity of 155.2 mPa.s;
the preparation method of the activated montmorillonite comprises the following steps:
adding montmorillonite into sulfuric acid solution for activation treatment, adding a small amount of nano cerium nitrate, sealing and heating to 60 ℃, stirring for 8h, adding liquid alkali to adjust the pH of the solution to 6.5, and filtering, drying and calcining to obtain modified montmorillonite porous microspheres;
the addition amount of the nano cerium nitrate is 0.5 wt%;
the calcination comprises pre-sintering and sintering;
pre-burning, namely grinding montmorillonite particles into flour-like fine powder, and putting the powder into a box type furnace for pre-burning for 2.5 hours at 300 ℃; the sintering is carried out in a nitrogen atmosphere, the sintering temperature is 500 ℃, the time is 5 hours, and then the sintering is cooled along with the furnace;
3. preparation of emodin composite modifier:
adding the functional modifier containing emodin into a grinding machine, adding 20wt% of mixed auxiliary agent, adding a small amount of fat-soluble accelerator, mixing and grinding at the rotation speed of 700r/min for 3h to obtain an emodin composite modifier;
the mass ratio of the mixed auxiliary agent to the alumina to the dolomite powder to the coconut monoethanolamide is 15:8: 2;
the mixing ratio of the span80 to the n-butyl titanate is 0.2: 1; the addition amount of the accelerator accounts for 1.0wt% of the total amount;
the emodin composite modifier has a powder particle size of 500-520nm and a density of 2.02g/cm3；
4. Mixing the raw materials
Adding common PET slices into a double-screw extruder, injecting the emodin composite modifier into the double-screw extruder, melting and mixing at high speed, raising the temperature to 310 ℃, and mixing the melt with the water content of 0.05 wt%;
the melting and high-speed mixing are carried out, the rotating speed is 1200rad/min, and the mixing time is 90 min;
the mixing mass ratio of the emodin-containing functional modifier to the common PET slices is 1: 5;
5. high speed spinning
Inputting the mixed melt into a spinning manifold through a metering pump, and spinning by adopting a high-speed spinning process, wherein the manifold temperature of the spinning manifold is 2600 ℃, the rotating speed of the metering pump is 22r/min, spinneret holes are Y-shaped holes, and the specification of a spinneret plate is 2000 holes;
6. post-treatment
The fiber tows are cooled, drawn, oiled, heat-set and wound to form polyester filaments, so that modified polyester filaments containing emodin are obtained, and the main spinning technological parameters comprise:
cooling the tows by adopting cross-blown air, wherein the temperature of the cross-blown air is 18 ℃, the humidity is 45%, and the air speed is 1.2 m/s; primary drawing, wherein the drawing temperature is 180 ℃, the drawing multiple is 4.2 times, and the drawing speed is 12 m/min; the second time of drafting temperature is 100 ℃, the drafting multiple is 1.8 times, and the drafting speed is 3 m/min; heat setting at 120 deg.c and winding spinning speed of 3700 m/min.
The emodin modified polyester filament prepared by the technical scheme of the embodiment 1 has excellent antibacterial effect, can reduce the attachment of bacteria, and has the antibacterial rate of 98.5% for staphylococcus aureus, escherichia coli, candida albicans and other bacteria which are susceptible to the human body, besides, the breaking strength of the polyester filament is 6.08cN/dtex, the breaking elongation is 40.0%, the CV value of the breaking elongation is 8.8%, and the light transmittance is 75.2%; the polyester filament fabric has good water absorption and strong washing fastness, after being washed for 50 times, the antibacterial rate is still 97.7%, the tensile strength retention rate is 99.2%, and the water retention rate reaches 25.8%.
Example 2 emodin modified polyester filament yarn and preparation method thereof
1. Selection of raw materials:
emodin, loose powder in appearance, no agglomeration, orange long needle crystal, and uniform; the content of active ingredients is 98.8 percent, and the water content is 3.5 percent;
2. the preparation of the emodin-containing functional modifier comprises the following steps:
adding proper amount of water into a beaker, and adding NaCO3After the solid is stirred and dissolved, adding emodin powder, and stirring until the emodin powder is completely dissolved to obtain an emodin dispersion liquid;
adding activated montmorillonite into emodin dispersion, stirring at 50r/min for 60min to make emodin enter into porous material to obtain nanometer composite material, separating, and drying to obtain emodin-containing functional modifier;
the concentration of the emodin in the emodin dispersion liquid is 20 wt%;
the bath ratio of the activated montmorillonite in the emodin dispersion liquid is 1: 8;
the activated montmorillonite has the granularity of 600 meshes and the apparent viscosity of 157.5 mPa.s;
the preparation method of the activated montmorillonite comprises the following steps:
adding montmorillonite into sulfuric acid solution for activation treatment, adding a small amount of nano cerium nitrate, sealing and heating to 65 ℃, stirring for 8h, adding liquid alkali to adjust the pH of the solution to 6.9, and filtering, drying and calcining to obtain modified montmorillonite porous microspheres;
the addition amount of the nano cerium nitrate is 1.0 wt%;
the calcination comprises pre-sintering and sintering;
pre-burning, namely grinding montmorillonite particles into flour-like fine powder, and putting the powder into a box type furnace for pre-burning for 3 hours at 300 ℃; the sintering is carried out in a nitrogen atmosphere, the sintering temperature is 500 ℃, the time is 5 hours, and then the sintering is cooled along with the furnace;
3. preparation of emodin composite modifier:
adding the functional modifier containing emodin into a grinding machine, adding 20wt% of mixed auxiliary agent, adding a small amount of fat-soluble accelerator, mixing and grinding at the rotation speed of 700r/min for 5h to obtain an emodin composite modifier;
the mass ratio of the mixed auxiliary agent to the alumina to the dolomite powder to the coconut monoethanolamide is 13:9: 2;
the mixing ratio of the span80 to the n-butyl titanate is 0.2: 1; the addition amount of the accelerator accounts for 2.5wt% of the total amount;
the emodin composite modifier has the powder granularity of 600-640nm and the density of 2.24g/cm3；
4. Mixing the raw materials
Adding common PET slices into a double-screw extruder, injecting the emodin composite modifier into the double-screw extruder, melting and mixing at high speed, raising the temperature to 310 ℃, and mixing the melt with the water content of 0.08 wt%;
the melting and high-speed mixing are carried out, the rotating speed is 1200rad/min, and the mixing time is 90 min;
the mixing mass ratio of the emodin-containing functional modifier to the common PET slices is 1: 8;
5. high speed spinning
Inputting the mixed melt into a spinning manifold through a metering pump, and spinning by adopting a high-speed spinning process, wherein the temperature of the spinning manifold is 290 ℃, the rotating speed of the metering pump is 22r/min, spinneret holes are Y-shaped holes, and the specification of a spinneret plate is 2000 holes;
6. post-treatment
The fiber tows are cooled, drawn, oiled, heat-set and wound to form polyester filaments, so that modified polyester filaments containing emodin are obtained, and the main spinning technological parameters comprise:
cooling the tows by adopting cross air blow, wherein the temperature of the cross air blow is 18 ℃, the humidity is 50 percent, and the air speed is 1.3 m/s; primary drawing, wherein the drawing temperature is 180 ℃, the drawing multiple is 4.5 times, and the drawing speed is 12 m/min; the second time of drafting temperature is 100 ℃, the drafting multiple is 2.0 times, and the drafting speed is 4 m/min; heat setting at 125 deg.c and winding spinning speed 3700 m/min.
The emodin modified polyester filament prepared by the technical scheme of the embodiment 2 has excellent antibacterial effect, can reduce the attachment of bacteria, and has the antibacterial rate of 98.0% to staphylococcus aureus, escherichia coli, candida albicans and other bacteria which are susceptible to the human body, besides, the breaking strength of the polyester filament is 6.21cN/dtex, the breaking elongation is 39.2%, the CV value of the breaking elongation is 8.5%, and the light transmittance is 78.5%; the polyester filament fabric has good water absorption and strong washing fastness, after being washed for 50 times, the antibacterial rate is still 97.2%, the tensile strength retention rate is 98.5%, and the water retention rate reaches 29.5%.
Example 3 emodin modified polyester filament yarn and preparation method thereof
1. Selection of raw materials:
emodin, loose powder in appearance, no agglomeration, orange long needle crystal, and uniform; the content of active ingredients is 99.8 percent, and the water content is 4.0 percent;
2. the preparation of the emodin-containing functional modifier comprises the following steps:
adding proper amount of water into a beaker, and adding NaCO3After the solid is stirred and dissolved, adding emodin powder, and stirring until the emodin powder is completely dissolved to obtain an emodin dispersion liquid;
adding activated montmorillonite into emodin dispersion, stirring at 60r/min for 120min to make emodin enter into porous material to obtain nanometer composite material, separating, and drying to obtain emodin-containing functional modifier;
the concentration of the emodin in the emodin dispersion liquid is 25 wt%;
the bath ratio of the activated montmorillonite in the emodin dispersion liquid is 1: 10;
the particle size of the activated montmorillonite is 750-800 meshes, and the apparent viscosity is 159.8 mPa.s;
the preparation method of the activated montmorillonite comprises the following steps:
adding montmorillonite into sulfuric acid solution for activation treatment, adding a small amount of nano cerium nitrate, sealing and heating to 65 ℃, stirring for 8h, adding liquid alkali to adjust the pH of the solution to 7.5, and filtering, drying and calcining to obtain modified montmorillonite porous microspheres;
the addition amount of the nano cerium nitrate is 1.2 wt%;
the calcination comprises pre-sintering and sintering;
pre-burning, namely grinding montmorillonite particles into flour-like fine powder, and putting the powder into a box type furnace for pre-burning for 3 hours at 300 ℃; the sintering is carried out in a nitrogen atmosphere, the sintering temperature is 520 ℃, the time is 6 hours, and then the sintering is cooled along with the furnace;
3. preparation of emodin composite modifier:
adding the functional modifier containing the emodin into a grinding machine, adding 25wt% of a mixed auxiliary agent, adding a small amount of a fat-soluble promoter, mixing and grinding at the rotating speed of 800r/min for 5h to obtain an emodin composite modifier;
the mass ratio of the mixed auxiliary agent to the alumina to the dolomite powder to the coconut monoethanolamide is 12:10: 3;
the mixing ratio of the span80 to the n-butyl titanate is 0.4: 1; the addition amount of the accelerator accounts for 4wt% of the total amount;
the emodin composite modifier has a powder particle size of 600-700nm and a density of 2.30g/cm3；
4. Mixing the raw materials
Adding common PET slices into a double-screw extruder, injecting the emodin composite modifier into the double-screw extruder, melting and mixing at high speed, raising the temperature to 310 ℃, and mixing the melt with the water content of 0.08 wt%;
the melting and high-speed mixing are carried out, the rotating speed is 1200rad/min, and the mixing time is 90 min;
the mixing mass ratio of the emodin-containing functional modifier to the common PET slices is 1: 10;
5. high speed spinning
Inputting the mixed melt into a spinning manifold through a metering pump, and spinning by adopting a high-speed spinning process, wherein the temperature of the spinning manifold is 290 ℃, the rotating speed of the metering pump is 25r/min, spinneret holes are Y-shaped holes, and the specification of a spinneret plate is 2000 holes;
6. post-treatment
The fiber tows are cooled, drawn, oiled, heat-set and wound to form polyester filaments, so that modified polyester filaments containing emodin are obtained, and the main spinning technological parameters comprise:
cooling the tows by adopting cross air blow, wherein the temperature of the cross air blow is 20 ℃, the humidity is 50 percent, and the air speed is 1.3 m/s; primary drawing, wherein the drawing temperature is 190 ℃, the drawing multiple is 4.5 times, and the drawing speed is 13 m/min; the second time of drafting temperature is 120 ℃, the drafting multiple is 2.0 times, and the drafting speed is 4 m/min; heat setting at 125 deg.c and winding spinning speed of 3750 m/min.
The emodin modified polyester filament prepared by the technical scheme of the embodiment 3 has excellent antibacterial effect, can reduce the attachment of bacteria, and has the antibacterial rate of 97.2% for staphylococcus aureus, escherichia coli, candida albicans and other bacteria which are susceptible to the human body, besides, the breaking strength of the polyester filament is 6.16cN/dtex, the breaking elongation is 38.5%, the CV value of the breaking elongation is 9.0%, and the light transmittance is 79.7%; the polyester filament fabric has good water absorption and strong washing fastness, after being washed for 50 times, the antibacterial rate is still 96.5%, the tensile strength retention rate is 99.0%, and the water retention rate reaches 28.2%.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the emodin modified polyester filament yarn is characterized in that the polyester filament yarn contains 0.1 to 5 percent of emodin; the preparation method comprises the steps of preparing the emodin-containing functional modifier, preparing the emodin composite modifier, mixing and spinning at high speed.
2. The preparation method of claim 1, wherein the emodin-containing functional modifier is prepared by using activated montmorillonite in emodin dispersion liquid at a bath ratio of 1: 5-10.
3. The method as claimed in claim 2, wherein the activated montmorillonite has a particle size of 600-800 mesh and an apparent viscosity of 155-160 mPa.s.
4. The preparation method of claim 3, wherein the preparation method of the activated montmorillonite comprises adding montmorillonite into sulfuric acid solution for activation, sealing, heating to 60-65 deg.C, and stirring for 8 h.
5. The preparation method of claim 4, wherein the preparation method of the activated montmorillonite further comprises pre-sintering and sintering, wherein the pre-sintering comprises the steps of grinding montmorillonite particles into flour-like fine powder, and placing the flour-like fine powder into a box furnace for pre-sintering at 300 ℃ for 2.5-3 h; the sintering is carried out in a nitrogen atmosphere, the sintering temperature is 500-520 ℃, and the time is 5-6 h.
6. The method as claimed in claim 1, wherein the emodin complex modifier has a powder particle size of 500-700nm and a density of 2.0-2.3g/cm3。
7. The preparation method of claim 1, wherein the mixing ratio of the emodin-containing functional modifier to the common PET chips by mass is 1: 5-10.
8. The preparation method of claim 1, wherein the emodin composite modifier is prepared by adding 20-25wt% of a mixing auxiliary agent, wherein the mass ratio of the mixing auxiliary agent to the alumina to the dolomite powder to the coconut monoethanolamide is 12-15:8-10: 2-3.
9. The preparation method of claim 8, wherein a fat-soluble promoter is further added to the emodin composite modifier, and the mixing ratio of the fat-soluble promoter, span80 and n-butyl titanate is 0.2-0.4: 1; the addition amount of the accelerator accounts for 1-4wt% of the total amount.
10. The preparation method of claim 1, wherein the high-speed spinning is carried out, the temperature of the spinning box body is 260-290 ℃, the rotating speed of the metering pump is 22-25r/min, and the spinneret holes are Y-shaped holes.
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