CN118223149A - Hollow porous polyester fiber and preparation method thereof - Google Patents
Hollow porous polyester fiber and preparation method thereof Download PDFInfo
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- CN118223149A CN118223149A CN202410606844.4A CN202410606844A CN118223149A CN 118223149 A CN118223149 A CN 118223149A CN 202410606844 A CN202410606844 A CN 202410606844A CN 118223149 A CN118223149 A CN 118223149A
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- 229920000728 polyester Polymers 0.000 title claims abstract description 234
- 239000000835 fiber Substances 0.000 title claims abstract description 197
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000011148 porous material Substances 0.000 claims abstract description 62
- 239000003513 alkali Substances 0.000 claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 238000001035 drying Methods 0.000 claims abstract description 44
- 238000009987 spinning Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000005406 washing Methods 0.000 claims abstract description 14
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical compound OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 claims description 66
- 238000009740 moulding (composite fabrication) Methods 0.000 claims description 56
- 238000009998 heat setting Methods 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 25
- 235000019445 benzyl alcohol Nutrition 0.000 claims description 22
- 238000004804 winding Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 7
- 238000002788 crimping Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000001291 vacuum drying Methods 0.000 claims description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 57
- 229920000954 Polyglycolide Polymers 0.000 description 29
- 239000004633 polyglycolic acid Substances 0.000 description 29
- 239000000243 solution Substances 0.000 description 21
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- 239000012670 alkaline solution Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 229920001634 Copolyester Polymers 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000002074 melt spinning Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000000879 optical micrograph Methods 0.000 description 3
- 239000004753 textile Substances 0.000 description 3
- -1 Polyethylene terephthalate Polymers 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 239000004626 polylactic acid Substances 0.000 description 2
- WSQZNZLOZXSBHA-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione Chemical compound O=C1OCCCCOC(=O)C2=CC=C1C=C2 WSQZNZLOZXSBHA-UHFFFAOYSA-N 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229920003232 aliphatic polyester Polymers 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920005586 poly(adipic acid) Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- D01F1/08—Addition of substances to the spinning solution or to the melt for forming hollow filaments
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Artificial Filaments (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention belongs to the technical field of functional fibers, and relates to a hollow porous polyester fiber and a preparation method thereof. The preparation method comprises the following steps: carrying out melt blending spinning on polyester and a pore-forming agent to obtain hollow polyester fibers, and then carrying out alkali deweighting treatment, water washing and drying on the hollow polyester fibers to obtain the hollow porous polyester fibers; the pore-forming agent is PGA; the prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the wall of the hole, the average pore diameter of the holes is 3-5 mu m, and the variation coefficient of the pore diameter is less than or equal to 15%; the number of holes with the pore diameter of 3-5 mu m is more than 75%, more than 20% of the holes with the pore diameter of 3-5 mu m penetrate through the surface and the hollow part of the fiber, the porosity is 11.54-44.72%, and the BET is 0.254-1.678m 2/g. The invention reduces the influence of alkali deweighting treatment on the environment, and the prepared hollow porous polyester fiber has uniform pore size and high porosity.
Description
Technical Field
The invention belongs to the technical field of functional fibers, and relates to a hollow porous polyester fiber and a preparation method thereof.
Background
Polyethylene terephthalate (polyester) is a crystalline engineering plastic with excellent mechanical properties, heat resistance, corrosion resistance and other properties, and is widely applied to the fields of fibers, films, polyester bottles and the like, and is one of the most widely applied traditional petroleum-based polymers. Polyester fiber (polyester) has become the textile material with the largest output and the most wide application in the world and occupies more than 50% of the fields of clothing, home textile and industry, however, with the progress of the living standard and science and technology of people, the problems of sultry, poor comfort and the like exposed by the traditional polyester are also gradually valued by people. Therefore, improving the comfort of polyester fibers is a problem to be solved during the use of polyesters.
The hydrophilic groups in the polyester molecular chain are less, so the fiber itself has no hygroscopicity, and if the microporous structure is constructed on the surface and the inside of the fiber based on the capillary effect of the microporous structure, the corresponding polyester product (such as clothing, home textile and the like) can show good moisture and air permeability.
The patent application CN1472375A is prepared by blending conventional polyester, modified easy-hydrolysis polyester and functional modified master batch according to a certain weight proportion through a hollow spinneret plate for melt spinning, and performing alkali reduction treatment on the spun fiber after weaving to obtain a functional hollow microporous polyester fabric, so that the fabric is endowed with higher negative ion emissivity and far infrared emissivity; patent application CN101492841A discloses a hollow microporous special-shaped polyester fiber and a preparation method thereof, wherein the special-shaped spinneret plate is adopted for spinning after polyester chips and ionic copolyester components containing sodium sulfonate groups are blended, and the fiber is processed by an alkali deweighting post-treatment process.
However, due to the similarity of the molecular chains of the conventional polyester and the soluble polyester (modified easily-hydrolyzed polyester or ionic copolyester containing sodium sulfonate groups), more grooves are formed on the surface of the fiber instead of holes in the melt spinning process, and the holes are uneven in size, so that the capillary effect is greatly reduced, and meanwhile, degradation products of the soluble polyester in the alkali deweighting process bring a certain harm to the environment.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a hollow porous polyester fiber and a preparation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A preparation method of hollow porous polyester fiber comprises the steps of carrying out melt blending spinning on polyester and a pore-forming agent to obtain the hollow polyester fiber, and then carrying out alkali deweighting treatment, water washing and drying on the hollow polyester fiber to obtain the hollow porous polyester fiber, wherein the pore-forming agent is PGA (polyglycolic acid).
As a preferable technical scheme:
According to the preparation method of the hollow porous polyester fiber, the intrinsic viscosity of PGA is 0.90-1.40dL/g, the melt index at 2.16kg and 230 ℃ is 9-20g/10min, and the melting point is 220-235 ℃.
According to the preparation method of the hollow porous polyester fiber, the mass ratio of the polyester to the pore-forming agent is 80-99:1-20.
The preparation method of the hollow porous polyester fiber comprises the following steps of: the hollow polyester fiber is placed in a sealed reaction kettle filled with alkali solution, and the sealed reaction kettle is sequentially subjected to heating, heat preservation and cooling treatment, so that the alkali reduction rate of the hollow polyester fiber is 3.12-46.44wt%, and the sealed reaction kettle is kept to rotate in the treatment process.
According to the preparation method of the hollow porous polyester fiber, the mass ratio of the hollow polyester fiber to the alkali solution is 1-3:50-100.
The preparation method of the hollow porous polyester fiber comprises the steps that the alkali solution consists of strong alkali (NaOH and KOH), benzyl alcohol and water, wherein the concentration of the strong alkali is 2-6g/L, and the concentration of the benzyl alcohol is 2-4mL/L.
According to the preparation method of the hollow porous polyester fiber, the sealed reaction kettle is sequentially subjected to heating, heat preservation and cooling treatment, namely, the temperature is firstly increased to 90-110 ℃ at the speed of 2-4 ℃/min, then is kept for 30-60min, and then is cooled to 70-80 ℃ at the speed of 3-6 ℃/min.
According to the preparation method of the hollow porous polyester fiber, the rotating speed of the sealed reaction kettle is 10-20rpm.
The preparation method of the hollow porous polyester fiber comprises the following steps of: washing with pure water at 70-90deg.C and 50-70deg.C twice respectively, and washing with cold water for several times until the water is clear; the drying temperature is 90-110 ℃ and the drying time is 1-3h.
According to the preparation method of the hollow porous polyester fiber, before melt blending spinning, the polyester and the pore-forming agent are respectively dried until the water content is less than 200ppm.
The preparation method of the hollow porous polyester fiber comprises the following drying treatment steps: drying at 90-110deg.C for 2-3 hr, and vacuum drying at 100-120deg.C for 6-9 hr.
The preparation method of the hollow porous polyester fiber comprises the following steps of: and sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent through a screw extruder to obtain primary yarns, and sequentially carrying out bundling, drafting, tension heat setting, crimping, oiling and relaxation heat setting on the primary yarns to obtain the hollow polyester fibers.
The preparation method of the hollow porous polyester fiber comprises the following technological parameters of melt blending spinning: the temperature of the screw is 270-290 ℃, the temperature of the spinning box is 275-285 ℃, the pressure difference between the inlet air and the return air of the circular blowing is 500-750Pa, the winding speed is 1000-1100m/min, the temperature of the oil bath in the primary oil bath drafting is 60-64 ℃, the temperature of the secondary drafting is 100-120 ℃, the drafting multiple is 3-4 times, and the temperature of tension heat setting is 150-170 ℃.
The invention also provides the hollow porous polyester fiber prepared by the preparation method of any one of the hollow porous polyester fiber, which has a hollow structure, wherein holes are distributed on the hole wall, the variation coefficient of the hole diameter is less than or equal to 15%, the porosity is 11.54-44.72%, and the BET is 0.254-1.678m 2/g.
As a preferable technical scheme:
The hollow porous polyester fiber has the average pore diameter of 3-5 mu m, the number of pores with the pore diameter of 3-5 mu m is more than 75%, and more than 22.4% of pores with the pore diameter of 3-5 mu m penetrate through the surface and the hollow part of the fiber; the fineness of the hollow porous polyester fiber is 1.47-1.72dtex, the breaking strength is 2.5-4.0cN/dtex, and the breaking elongation is 18.32-30.78%.
The principle of the invention:
In the prior art, ionic copolyester or modified easily-hydrolyzed polyester containing sodium sulfonate groups is used as a pore-forming agent, the two are of a polyester structure, molecular chains are entangled with those of conventional polyester when the polyester structure is crystallized, and when alkali decrement treatment is carried out, on one hand, the formed holes are basically different in size, on the other hand, the porosity of the fiber is lower, and the surface of the fiber is more formed into ravines instead of holes.
According to the invention, PGA is adopted as a pore-forming agent, and because the molecular chain structures of the PGA and the polyester are different, the molecular chain movement and the ability of building into a crystal lattice are different in the crystallization process, and the interaction influence is small when the PGA and the polyester are crystallized, so that most of the formed holes can penetrate through the fiber surface and the hollow part after alkali decrement treatment; because the molecular chain structure of the PGA is more regular, the PGA can be more quickly built into the lattice in the crystallization process, and the sizes of the formed holes are basically the same, so that the PGA can be endowed with higher filterability; since degradation of PGA mainly occurs during alkali decrement, degradation of the amorphous region of PGA can cause degradation of polyester, so that the number of holes formed is large, the porous structure can increase the specific surface area of the fiber, thereby enhancing the moisture absorption and perspiration performance and improving the comfort.
PGA is an aliphatic polyester-based polymer material having good biodegradability and biocompatibility. Compared with biodegradable materials such as polylactic acid (PLA) and poly (adipic acid)/butylene terephthalate (PBAT), PGA has the fastest degradation speed at present and does not need special degradation conditions, and finally is degraded into carbon dioxide and water.
The coal-based PGA synthetic route independently researched and developed in China is suitable for large-scale production, the cost is low, the estimated production cost of the coal-based PGA in industry is 10111 yuan/ton, and is lower than the production cost of PBAT and PLA, and the production cost is similar to the production cost of the coal-based polyethylene process. Therefore, after the PGA and the polyester are melt-blended, the PGA can be degraded into nontoxic and harmless carbon dioxide and water through certain alkali decrement treatment, and the hollow porous polyester fiber with uniform pore size and high porosity is obtained.
The beneficial effects are that:
(1) The preparation method has low requirements on production equipment, high efficiency and convenient mass production, and the alkali reduction liquid can be recycled, so that the influence of alkali reduction treatment on the environment is greatly reduced.
(2) The hollow porous polyester fiber prepared by the invention has the characteristics of hollowness and porosity, and can obviously improve the specific surface area and the filtering performance of the fiber.
Drawings
FIG. 1 is an optical micrograph of a cross section of a hollow porous polyester fiber prepared in example 1;
FIG. 2 is an optical micrograph of the hollow polyester fiber prepared in example 1;
FIG. 3 is an optical micrograph of the hollow porous polyester fiber prepared in example 1.
Detailed Description
The application is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
The following are test methods for the relevant performance indicators in each of the examples and comparative examples:
intrinsic viscosity of PGA: the test was performed with reference to the SN/T1015-2001 standard.
Melt index of PGA at 2.16kg, 230 ℃ C: the test was performed with reference to the GB/T3682.1-2018 standard.
Melting point of PGA: the test was performed with reference to JJG 701-2008 standard.
Coefficient of variation: after sampling according to GB/T14334-2006, 50 fibers are randomly selected, the fibers are placed under a microscope for viewing, the number of holes and the aperture are counted, and the average value and the variation coefficient are calculated.
Porosity: the determination is made with reference to the SN/T2640-2010 standard.
BET: the measurement was performed with reference to GB/T19587-2017 standard.
Fineness: the measurement was performed with reference to GB/T14335-2008 standard.
Breaking strength and elongation at break: the measurement was carried out with reference to GB/T14337-2022, in which the stretching speed was 30mm/min.
Example 1
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
pore-forming agent: PGA, manufactured by Shandong Jiaying chemical technology Co., ltd., china, with a brand of PGA-12, an intrinsic viscosity of 1.00-1.40dL/g, a melt index of 10-20g/10min at 2.16kg and 230 ℃, and a melting point of 225-235 ℃;
Alkaline solution: consists of NaOH, benzyl alcohol and water, wherein the concentration of the NaOH is 4g/L, and the concentration of the benzyl alcohol is 3mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 2 hours at 100 ℃ and then drying for 8 hours at 110 ℃) in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 90:10 by a screw extruder to obtain primary yarns, and sequentially carrying out bundling, drafting, tension heat setting, crimping, oiling and relaxation heat setting on the primary yarns to obtain hollow polyester fibers, wherein the hollow polyester fibers are shown in figure 2 under an optical microscope;
wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first region of the screw is 270 ℃, the temperature of the second region is 275 ℃, the temperature of the third region is 280 ℃, the temperature of the fourth region is 285 ℃, the temperature of the fifth region is 280 ℃, the temperature of the sixth region is 275 ℃, the temperature of the spinning manifold is 280 ℃, the pressure difference between the circular blowing air inlet and the circular blowing air return is 700Pa, the winding speed is 1050m/min, the temperature of the oil bath in the primary oil bath drafting is 60 ℃, the temperature of the secondary drafting is 110 ℃, the drafting multiple is 3.51 times, and the temperature of tension heat setting is 160 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with alkali solution, heating to 110 ℃ at a speed of 2 ℃/min, preserving heat for 30min, cooling to 80 ℃ at a speed of 3 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 15rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 2.54:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 18.33wt%;
(4) After washing the hollow polyester fiber with pure water at 80 ℃ and 60 ℃ twice, respectively, drying the hollow polyester fiber at 100 ℃ for 2 hours to obtain the hollow porous polyester fiber, wherein the hollow porous polyester fiber is shown in figure 3 under an optical microscope.
The cross section of the hollow porous polyester fiber under an optical microscope is shown as figure 1, the hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 4.16 mu m, the variation coefficient of the pore diameter is 10.2%, the number of the holes with the pore diameter of 3-5 mu m is 78.1%, 26.7% of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 18.32%, and the BET is 0.746m 2/g;
the titer of the hollow porous polyester fiber is 1.6dtex, the breaking strength is 3.5cN/dtex, and the breaking elongation is 30.78%.
Comparative example 1
A method for preparing polyester fiber, which is basically the same as in example 1, and is only different in that: the pore-forming agent in the step (1) is modified easily-hydrolyzed polyester in the patent application CN 1472375A; the mass ratio of the polyester to the pore-forming agent in the step (2) is 80:20; step (3) is that after the hollow polyester fiber is processed and woven into a fabric, the fabric is treated for 50min in a boiling state (100 ℃) by using 2% NaOH aqueous solution under the condition that the concentration of an auxiliary agent (dodecyl quaternary ammonium nitrate sodium salt) is 50ppm, and the alkali reduction rate of the hollow polyester fiber after the treatment is 18wt%.
The variation coefficient of the pore diameter of the holes in the finally prepared polyester fiber is 13.5%, the porosity is 6.78%, and the BET is 0.136m 2/g.
Under the condition that the alkali decrement of the hollow polyester fiber is close, the uniformity of the pore size of the comparative example 1 is obviously lower than that of the example 1, and the pore forming effect is poor because the similarity of the molecular chains of the conventional polyester and the modified polyester easy to hydrolyze is that the surface of the fiber is more formed into ravines instead of pores in the melt spinning process, and the capillary effect is greatly reduced because the pores are uneven in size.
Comparative example 2
A method for preparing polyester fiber, which is basically the same as in example 1, and is only different in that: the pore-forming agent in the step (1) is an ionic copolyester component containing sodium sulfonate groups in the patent application CN 101492841A; the mass ratio of the polyester to the pore-forming agent in the step (2) is 60:40; and (3) treating the hollow polyester fiber in an NaOH aqueous solution (the mass of NaOH is 10% of that of the hollow polyester fiber) with a bath ratio of 1:50 (the mass of the hollow polyester fiber: the mass of the NaOH) at 98 ℃ for 60min, wherein the alkali reduction rate of the hollow polyester fiber after treatment is 15.2wt%.
The surface of the finally prepared polyester fiber forms a long and narrow concave etching structure with different lengths, the variation coefficient of the aperture of the holes in the polyester fiber is 15.4%, the porosity is 10.56%, and the BET is 0.219m 2/g.
Under the condition that the alkali decrement of the hollow polyester fiber is close, the uniformity of the pore size of the comparative example 2 is obviously lower than that of the example 1, and the pore forming effect is poor because the similarity of molecular chains of the conventional polyester and the ionic copolyester containing sodium sulfonate groups is that more grooves are formed on the surface of the fiber instead of pores in the melt spinning process, and the capillary effect is greatly reduced because the pores are uneven in size.
Example 2
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is PGA-10, intrinsic viscosity is 0.90-1.38dL/g, melt index is 10-20g/10min at 2.16kg and 230 ℃, and melting point is 220-235deg.C;
alkaline solution: consists of KOH, benzyl alcohol and water, wherein the concentration of the KOH is 2g/L, and the concentration of the benzyl alcohol is 2mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 2 hours at 105 ℃ and then drying for 7 hours at 100 ℃) in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 95:5 by a screw extruder to obtain a primary yarn, and sequentially carrying out bundling, drafting, tension heat setting, curling, oiling and relaxation heat setting on the primary yarn to obtain a hollow polyester fiber;
wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first region of the screw is 270 ℃, the temperature of the second region is 275 ℃, the temperature of the third region is 280 ℃, the temperature of the fourth region is 285 ℃, the temperature of the fifth region is 280 ℃, the temperature of the sixth region is 275 ℃, the temperature of the spinning manifold is 280 ℃, the pressure difference between the circular blowing air inlet and the circular blowing air return is 680Pa, the winding speed is 1000m/min, the temperature of the oil bath in the primary oil bath drafting is 62 ℃, the temperature of the secondary drafting is 100 ℃, the drafting multiple is 3.31 times, and the temperature of tension heat setting is 170 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with an alkali solution, heating to 90 ℃ at a speed of 3 ℃/min, preserving heat for 30min, cooling to 70 ℃ at a speed of 4 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 10rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 3:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 3.21wt%;
(4) And (3) respectively washing the hollow polyester fiber with pure water at 70 ℃ and 50 ℃ for two times, and drying the hollow polyester fiber at 90 ℃ for 1h to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 3 mu m, the variation coefficient of the pore diameter is 10.43%, the number of the holes with the pore diameter of 3-5 mu m is 76.3%, 22.4% of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 11.54%, and the BET is 0.254m 2/g;
the titer of the hollow porous polyester fiber is 1.72dtex, the breaking strength is 4cN/dtex, and the breaking elongation is 25.35%.
Example 3
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is new chemical material limited company of Shanghai Pu Jing in China, brand is PGA-26, intrinsic viscosity is 1.104-1.223dL/g, melt index is 9-15g/10min at 2.16kg and 230 ℃, and melting point is 225-230 ℃;
alkaline solution: consists of KOH, benzyl alcohol and water, wherein the concentration of the KOH is 2g/L, and the concentration of the benzyl alcohol is 3mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying at 110 ℃ for 2.5 hours and then vacuum drying at 110 ℃ for 8 hours), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 90:10 by a screw extruder to obtain primary filaments, and sequentially carrying out bundling, drafting, tension heat setting, crimping, oiling and relaxation heat setting on the primary filaments to obtain hollow polyester fibers;
Wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first area of the screw is 275 ℃, the temperature of the second area is 280 ℃, the temperature of the third area is 285 ℃, the temperature of the fourth area is 290 ℃, the temperature of the fifth area is 285 ℃, the temperature of the sixth area is 280 ℃, the temperature of a spinning box is 285 ℃, the pressure difference between the inlet air and the return air of circular blowing is 600Pa, the winding speed is 1050m/min, the temperature of the oil bath in the primary oil bath drafting is 60 ℃, the temperature of the secondary drafting is 120 ℃, the drafting multiple is 3 times, and the temperature of tension heat setting is 160 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with alkali solution, heating to 100 ℃ at a speed of 2 ℃/min, preserving heat for 45min, cooling to 75 ℃ at a speed of 3 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 10rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 2.75:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 5.33wt%;
(4) Washing the hollow polyester fiber with pure water at 75 ℃ and 55 ℃ for two times respectively, and drying the hollow polyester fiber at 95 ℃ for 1.5 hours to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 3.62 mu m, the variation coefficient of the pore diameter is 9.54%, the number of the holes with the pore diameter of 3-5 mu m is 77%, 23.9% of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 12.83%, and the BET is 0.316m 2/g;
The titer of the hollow porous polyester fiber is 1.7dtex, the breaking strength is 4cN/dtex, and the breaking elongation is 25.03%.
Example 4
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is new chemical material limited company of Shanghai Pu Jing in China, brand is PGA-26, intrinsic viscosity is 1.104-1.223dL/g, melt index is 9-15g/10min at 2.16kg and 230 ℃, and melting point is 225-230 ℃;
alkaline solution: consists of NaOH, benzyl alcohol and water, wherein the concentration of the NaOH is 2g/L, and the concentration of the benzyl alcohol is 4mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 2 hours at 100 ℃ and then drying for 6 hours at 110 ℃) in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 99:1 by a screw extruder to obtain a primary yarn, and sequentially carrying out bundling, drafting, tension heat setting, curling, oiling and relaxation heat setting on the primary yarn to obtain a hollow polyester fiber;
wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first region of the screw is 270 ℃, the temperature of the second region is 275 ℃, the temperature of the third region is 280 ℃, the temperature of the fourth region is 285 ℃, the temperature of the fifth region is 280 ℃, the temperature of the sixth region is 275 ℃, the temperature of the spinning manifold is 280 ℃, the pressure difference between the circular blowing air inlet and the circular blowing air return is 500Pa, the winding speed is 1030m/min, the temperature of the oil bath in the primary oil bath drafting is 64 ℃, the temperature of the secondary drafting is 110 ℃, the drafting multiple is 3.24 times, and the temperature of tension heat setting is 165 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with an alkali solution, heating to 110 ℃ at a speed of 4 ℃/min, preserving heat for 60min, cooling to 80 ℃ at a speed of 6 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 15rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 2.34:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 18.81wt%;
(4) And (3) respectively washing the hollow polyester fiber with pure water at 80 ℃ and 60 ℃ for two times, and drying the hollow polyester fiber at 100 ℃ for 2 hours to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 3.84 mu m, the variation coefficient of the pore diameter is 10.92%, the number of the holes with the pore diameter of 3-5 mu m is 77.4%, 26.3% of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 22.89%, and the BET is 0.75m 2/g;
The titer of the hollow porous polyester fiber is 1.55dtex, the breaking strength is 3.2cN/dtex, and the breaking elongation is 22.56%.
Example 5
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is new chemical material limited company of Shanghai Pu Jing in China, brand is PGA-26, intrinsic viscosity is 1.104-1.223dL/g, melt index is 9-15g/10min at 2.16kg and 230 ℃, and melting point is 225-230 ℃;
alkaline solution: consists of NaOH, benzyl alcohol and water, wherein the concentration of the NaOH is 4g/L, and the concentration of the benzyl alcohol is 4mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 3 hours at 95 ℃ and then drying for 8 hours at 120 ℃) in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 90:10 by a screw extruder to obtain a primary yarn, and sequentially carrying out bundling, drafting, tension heat setting, curling, oiling and relaxation heat setting on the primary yarn to obtain a hollow polyester fiber;
Wherein, the technological parameters of melt blending spinning are as follows: 270 ℃ for the first area of the screw, 275 ℃ for the second area, 280 ℃ for the third area, 285 ℃ for the fourth area, 280 ℃ for the fifth area, 275 ℃ for the sixth area, 275 ℃ for the spinning box, 700Pa for the pressure difference between the inlet air and the return air of the circular blowing air, 1080m/min for the winding speed, 60 ℃ for the oil bath in the primary oil bath drafting, 100 ℃ for the secondary drafting, 3.72 times of the drafting multiple and 155 ℃ for the tension heat setting;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with an alkali solution, heating to 100 ℃ at a speed of 2 ℃/min, preserving heat for 45min, cooling to 80 ℃ at a speed of 3 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 15rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 1.98:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 8.03wt%;
(4) Washing the hollow polyester fiber with pure water at 85 ℃ and 65 ℃ for two times respectively, and drying the hollow polyester fiber at 105 ℃ for 2 hours to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 3.91 mu m, the variation coefficient of the pore diameter is 10.37 percent, the number of the holes with the pore diameter of 3-5 mu m is 76 percent, 24 percent of the holes with the pore diameter of 3-5 mu m penetrate through the surface and the hollow part of the fiber, the porosity is 16.29 percent, and the BET is 0.583m 2/g;
the titer of the hollow porous polyester fiber is 1.67dtex, the breaking strength is 3.8cN/dtex, and the breaking elongation is 24.8%.
Example 6
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is new chemical material limited company of Shanghai Pu Jing in China, brand is PGA-26, intrinsic viscosity is 1.104-1.223dL/g, melt index is 9-15g/10min at 2.16kg and 230 ℃, and melting point is 225-230 ℃;
alkaline solution: consists of NaOH, benzyl alcohol and water, wherein the concentration of the NaOH is 4g/L, and the concentration of the benzyl alcohol is 2mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 2 hours at 105 ℃ and then drying for 9 hours at 110 ℃ in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 90:10 by a screw extruder to obtain a primary yarn, and sequentially carrying out bundling, drafting, tension heat setting, curling, oiling and relaxation heat setting on the primary yarn to obtain a hollow polyester fiber;
Wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first region of the screw is 270 ℃, the temperature of the second region is 275 ℃, the temperature of the third region is 280 ℃, the temperature of the fourth region is 285 ℃, the temperature of the fifth region is 280 ℃, the temperature of the sixth region is 275 ℃, the temperature of the spinning manifold is 280 ℃, the pressure difference between the circular blowing air inlet and the circular blowing air return is 600Pa, the winding speed is 1000m/min, the temperature of the oil bath in the primary oil bath drafting is 63 ℃, the temperature of the secondary drafting is 110 ℃, the drafting multiple is 3.54 times, and the temperature of tension heat setting is 160 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with alkali solution, heating to 100 ℃ at a speed of 2 ℃/min, preserving heat for 60min, cooling to 75 ℃ at a speed of 4 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 10rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 2.35:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 17.09wt%;
(4) Washing the hollow polyester fiber with pure water at 80 ℃ and 55 ℃ for two times respectively, and drying the hollow polyester fiber at 100 ℃ for 1.5 hours to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 4.27 mu m, the variation coefficient of the pore diameter is 10.44%, the number of the holes with the pore diameter of 3-5 mu m is 75.6%, 23.6% of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 21.04%, and the BET is 0.628m 2/g;
the titer of the hollow porous polyester fiber is 1.54dtex, the breaking strength is 3.3cN/dtex, and the breaking elongation is 22.42%.
Example 7
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is new chemical material limited company of Shanghai Pu Jing in China, brand is PGA-26, intrinsic viscosity is 1.104-1.223dL/g, melt index is 9-15g/10min at 2.16kg and 230 ℃, and melting point is 225-230 ℃;
Alkaline solution: consists of NaOH, benzyl alcohol and water, wherein the concentration of the NaOH is 6g/L, and the concentration of the benzyl alcohol is 3mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 3 hours at 100 ℃ and then drying for 8 hours at 100 ℃) in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 85:15 by a screw extruder to obtain a primary yarn, and sequentially carrying out bundling, drafting, tension heat setting, curling, oiling and relaxation heat setting on the primary yarn to obtain a hollow polyester fiber;
Wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first area of the screw is 275 ℃, the temperature of the second area is 280 ℃, the temperature of the third area is 285 ℃, the temperature of the fourth area is 290 ℃, the temperature of the fifth area is 285 ℃, the temperature of the sixth area is 280 ℃, the temperature of a spinning box is 285 ℃, the pressure difference between the inlet air and the return air of circular blowing is 700Pa, the winding speed is 1050m/min, the temperature of the oil bath in the primary oil bath drafting is 60 ℃, the temperature of the secondary drafting is 100 ℃, the drafting multiple is 3.68 times, and the temperature of tension heat setting is 150 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with an alkali solution, heating to 90 ℃ at a speed of 3 ℃/min, preserving heat for 60min, cooling to 80 ℃ at a speed of 3 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 15rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 2.04:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 17.06wt%;
(4) And (3) respectively washing the hollow polyester fiber with pure water at 75 ℃ and 60 ℃ twice, and drying the hollow polyester fiber at 95 ℃ for 2 hours to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 4.52 mu m, the variation coefficient of the pore diameter is 11.3 percent, the number of the holes with the pore diameter of 3-5 mu m is 75.9 percent, 22.7 percent of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 21 percent, and the BET is 0.563m 2/g;
the titer of the hollow porous polyester fiber is 1.54dtex, the breaking strength is 3.3cN/dtex, and the breaking elongation is 22.51%.
Example 8
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is new chemical material limited company of Shanghai Pu Jing in China, brand is PGA-26, intrinsic viscosity is 1.104-1.223dL/g, melt index is 9-15g/10min at 2.16kg and 230 ℃, and melting point is 225-230 ℃;
Alkaline solution: consists of NaOH, benzyl alcohol and water, wherein the concentration of the NaOH is 6g/L, and the concentration of the benzyl alcohol is 4mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 2 hours at 95 ℃ and then drying for 7 hours at 110 ℃) in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 80:20 by a screw extruder to obtain a primary yarn, and sequentially carrying out bundling, drafting, tension heat setting, curling, oiling and relaxation heat setting on the primary yarn to obtain a hollow polyester fiber;
Wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first region of the screw is 270 ℃, the temperature of the second region is 275 ℃, the temperature of the third region is 280 ℃, the temperature of the fourth region is 285 ℃, the temperature of the fifth region is 280 ℃, the temperature of the sixth region is 275 ℃, the temperature of the spinning manifold is 280 ℃, the pressure difference between the circular blowing air inlet and the circular blowing air return is 700Pa, the winding speed is 1050m/min, the temperature of the oil bath in the primary oil bath drafting is 60 ℃, the temperature of the secondary drafting is 110 ℃, the drafting multiple is 3.27 times, and the temperature of tension heat setting is 160 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with alkali solution, heating to 100 ℃ at a speed of 2 ℃/min, preserving heat for 30min, cooling to 75 ℃ at a speed of 5 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 15rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 1.57:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 25.41wt%;
(4) Washing the hollow polyester fiber with pure water at 85 ℃ and 65 ℃ for two times respectively, and drying the hollow polyester fiber at 105 ℃ for 2.5 hours to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 4.74 mu m, the variation coefficient of the pore diameter is 13.5%, the number of the holes with the pore diameter of 3-5 mu m is 75.5%, 24.1% of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 28.77%, and the BET is 0.873m 2/g;
The titer of the hollow porous polyester fiber is 1.47dtex, the breaking strength is 3.1cN/dtex, and the breaking elongation is 21.47%.
Example 9
The preparation method of the hollow porous polyester fiber comprises the following specific steps:
(1) Preparing raw materials;
and (3) polyester: the manufacturer is Jiangsu Cheng Hong Koch Co Ltd, and the trade mark is M02;
Pore-forming agent: PGA, manufacturer is new chemical material limited company of Shanghai Pu Jing in China, brand is PGA-26, intrinsic viscosity is 1.104-1.223dL/g, melt index is 9-15g/10min at 2.16kg and 230 ℃, and melting point is 225-230 ℃;
Alkaline solution: consists of NaOH, benzyl alcohol and water, wherein the concentration of the NaOH is 6g/L, and the concentration of the benzyl alcohol is 2mL/L;
Pure water;
(2) Respectively drying polyester and a pore-forming agent (firstly drying for 2 hours at 90 ℃ and then drying for 8 hours at 110 ℃) in vacuum), sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent with the mass ratio of 90:10 by a screw extruder to obtain a primary yarn, and sequentially carrying out bundling, drafting, tension heat setting, curling, oiling and relaxation heat setting on the primary yarn to obtain a hollow polyester fiber;
Wherein, the technological parameters of melt blending spinning are as follows: the temperature of the first area of the screw is 275 ℃, the temperature of the second area is 280 ℃, the temperature of the third area is 285 ℃, the temperature of the fourth area is 290 ℃, the temperature of the fifth area is 285 ℃, the temperature of the sixth area is 280 ℃, the temperature of a spinning box is 285 ℃, the pressure difference between the inlet air and the return air of circular blowing is 750Pa, the winding speed is 1100m/min, the temperature of the oil bath in the primary oil bath drafting is 64 ℃, the temperature of the secondary drafting is 120 ℃, the drafting multiple is 4 times, and the temperature of tension heat setting is 170 ℃;
(3) Placing the hollow polyester fiber in a sealed reaction kettle filled with an alkali solution, heating to 110 ℃ at a speed of 4 ℃/min, preserving heat for 45min, cooling to 70 ℃ at a speed of 6 ℃/min, and keeping the sealed reaction kettle to rotate at a speed of 20rpm in the treatment process; wherein the mass ratio of the hollow polyester fiber to the alkali solution is 1:100, and the alkali decrement rate of the hollow polyester fiber after treatment is 46.44wt%;
(4) And (3) respectively washing the hollow polyester fiber with pure water at 90 ℃ and 70 ℃ for two times, and drying the hollow polyester fiber at 110 ℃ for 3 hours to obtain the hollow porous polyester fiber.
The finally prepared hollow porous polyester fiber has a hollow structure, holes are distributed on the hole wall, the average pore diameter of the holes is 5 mu m, the variation coefficient of the pore diameter is 15%, the number of the holes with the pore diameter of 3-5 mu m is 75%, 26.5% of the holes with the pore diameter of 3-5 mu m penetrate through the surface of the fiber and the hollow part, the porosity is 44.72%, and the BET is 1.678m 2/g;
The titer of the hollow porous polyester fiber is 1.35dtex, the breaking strength is 2.5cN/dtex, and the breaking elongation is 18.32%.
Claims (10)
1. A preparation method of hollow porous polyester fiber comprises the steps of carrying out melt blending spinning on polyester and a pore-forming agent to obtain the hollow polyester fiber, and then carrying out alkali deweighting treatment, water washing and drying on the hollow polyester fiber to obtain the hollow porous polyester fiber.
2. The method for preparing the hollow porous polyester fiber according to claim 1, wherein the mass ratio of the polyester to the pore-forming agent is 80-99:1-20.
3. The method for preparing the hollow porous polyester fiber according to claim 1, wherein the alkali deweighting treatment comprises the following steps: the hollow polyester fiber is placed in a sealed reaction kettle filled with alkali solution, and the sealed reaction kettle is sequentially subjected to heating, heat preservation and cooling treatment, so that the alkali reduction rate of the hollow polyester fiber is 3.12-46.44wt%, and the sealed reaction kettle is kept to rotate in the treatment process.
4. The method for preparing the hollow porous polyester fiber according to claim 3, wherein the mass ratio of the hollow polyester fiber to the alkali solution is 1-3:50-100; the alkali solution consists of strong alkali, benzyl alcohol and water, wherein the concentration of the strong alkali is 2-6g/L, and the concentration of the benzyl alcohol is 2-4mL/L; sequentially heating, preserving heat and cooling the sealed reaction kettle, namely heating to 90-110 ℃ at the speed of 2-4 ℃/min, preserving heat for 30-60min, and cooling to 70-80 ℃ at the speed of 3-6 ℃/min; the rotation speed of the sealed reaction kettle is 10-20rpm.
5. The method for preparing the hollow porous polyester fiber according to claim 1, wherein before melt blending spinning, the polyester and the pore-forming agent are respectively dried until the water content is less than 200ppm.
6. The method for preparing the hollow porous polyester fiber according to claim 5, wherein the drying treatment comprises the following steps: drying at 90-110deg.C for 2-3 hr, and vacuum drying at 100-120deg.C for 6-9 hr.
7. The method for preparing the hollow porous polyester fiber according to claim 1, wherein the process of preparing the hollow polyester fiber by melt blending and spinning the polyester and the pore-forming agent is as follows: and sequentially carrying out melt extrusion, spinning, cooling, winding and forming on the polyester and the pore-forming agent through a screw extruder to obtain primary yarns, and sequentially carrying out bundling, drafting, tension heat setting, crimping, oiling and relaxation heat setting on the primary yarns to obtain the hollow polyester fibers.
8. The method for preparing the hollow porous polyester fiber according to claim 7, wherein the process parameters of melt blending spinning comprise: the temperature of the screw is 270-290 ℃, the temperature of the spinning box is 275-285 ℃, the pressure difference between the inlet air and the return air of the circular blowing is 500-750Pa, the winding speed is 1000-1100m/min, the temperature of the oil bath in the primary oil bath drafting is 60-64 ℃, the temperature of the secondary drafting is 100-120 ℃, the drafting multiple is 3-4 times, and the temperature of tension heat setting is 150-170 ℃.
9. The hollow porous polyester fiber prepared by the preparation method of the hollow porous polyester fiber according to any one of claims 1 to 8, which is characterized by a hollow structure, wherein holes are distributed on the hole wall, the variation coefficient of the hole diameter is less than or equal to 15%, the porosity is 11.54 to 44.72%, and the BET is 0.254 to 1.678m 2/g.
10. The hollow porous polyester fiber according to claim 9, wherein the average pore diameter of the pores is 3 to 5 μm, the number of pores having a pore diameter of 3 to 5 μm is 75% or more, and 22.4% or more of the pores having a pore diameter of 3 to 5 μm penetrate the fiber surface and the hollow portion; the fineness of the hollow porous polyester fiber is 1.47-1.72dtex, the breaking strength is 2.5-4.0cN/dtex, and the breaking elongation is 18.32-30.78%.
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