CN114214742A - Preparation method of HDPE-PET multi-time hydrophilic composite short fiber - Google Patents
Preparation method of HDPE-PET multi-time hydrophilic composite short fiber Download PDFInfo
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- CN114214742A CN114214742A CN202111552772.2A CN202111552772A CN114214742A CN 114214742 A CN114214742 A CN 114214742A CN 202111552772 A CN202111552772 A CN 202111552772A CN 114214742 A CN114214742 A CN 114214742A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
- D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys
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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
- D01F1/08—Addition of substances to the spinning solution or to the melt for forming hollow filaments
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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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
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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
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/02—Moisture-responsive characteristics
- D10B2401/022—Moisture-responsive characteristics hydrophylic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Multicomponent Fibers (AREA)
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention discloses a preparation method of HDPE-PET multi-time hydrophilic composite short fiber, which comprises the following steps: feeding the melt of HDPE melt-extruded by the screw into a spinning manifold A as a fiber skin layer; the blended melt obtained by blending the conventional polyester and the CO-PET polyester and then drying and screw melting and extruding is sent into a spinning manifold B as a core layer of the fiber; respectively metering HDPE melt and blended melt, then feeding the HDPE melt and blended melt into a spinning assembly, then spraying the HDPE melt and blended melt out through a skin core hollow composite spinneret plate, cooling and forming the sprayed filaments through annular cooling air, oiling, winding the filaments, enabling the filaments to fall into a filament containing barrel, and balancing the filaments for a period of time; then the HDPE-PET multi-time hydrophilic composite short fiber is prepared by bundling, dipping, stretching, curling, shaping and cutting. The invention makes the fiber generate micropores, greatly increases the specific surface area, enlarges the hydrophilic group suction capacity and the attachment area, greatly improves the water suction capacity of the fiber, and has unique hydrophilic function for many times.
Description
Technical Field
The invention relates to the field of spinning, in particular to a preparation method of HDPE-PET multi-time hydrophilic composite short fiber.
Background
The objective demand and supply potential created by three trends of urbanization, marketization and internationalization are basic power sources for rapid development of economy, and the market of consumer products also rapidly grows along with the development of Chinese economy. The sanitary article is one of daily necessities, is closely related to consumers, and along with the improvement of living standard, people put forward more functional requirements on the sanitary material, hope that the sanitary material has good water absorption function and needs to be hydrophilic for many times.
In recent years, the market of Chinese sanitary products is growing rapidly towards high-end products, and especially, baby diapers are developing towards softer, thinner and more skin-caring. Today, hot air nonwovens are used in the diaper market for large areas, such as dotting, punching, 3D facing nonwovens, and a large number of new nonwovens are used for diapers. The demands of consumers drive manufacturers and raw material suppliers to develop and progress continuously. The PE/PET multi-time hydrophilic composite short fiber is widely applied to the manufacture of non-woven fabrics due to the strong water absorption function, and is an important raw material of the non-woven fabrics.
With the continuous improvement of living standard of people, the consumption demand of women sanitary napkins and baby diapers in China is obviously increased, and the products need to be hydrophilic and dry. The existing hydrophilic function is mainly to improve the oil mass on the fiber, but the surface adsorption capacity is limited, and the characteristic of poor multi-time hydrophilic effect exists, so that the HDPE-PET multi-time hydrophilic composite short fiber is manufactured aiming at the problems, and meanwhile, the HDPE-PET multi-time hydrophilic composite short fiber has multi-time hydrophilicity, ensures the dry and comfortable thinking effect, and meets the requirements of modern consumers.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a preparation method of HDPE-PET multi-hydrophilic composite short fiber, which enables the fiber to generate micropores, greatly increases the specific surface area, enlarges the hydrophilic group absorption amount and the attachment area, greatly improves the water absorption amount of the fiber and has unique multi-hydrophilic function.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a preparation method of HDPE-PET multi-time hydrophilic composite short fiber comprises the following steps:
(1) feeding the melt of HDPE melt-extruded by the screw into a spinning manifold A as a fiber skin layer;
(2) the blended melt obtained by blending the conventional polyester and the CO-PET polyester and then drying and screw melting and extruding is sent into a spinning manifold B as a core layer of the fiber;
(3) respectively metering the HDPE melt in the step (1) and the blended melt in the step (2), feeding the HDPE melt and the blended melt into a spinning assembly, spraying the HDPE melt and the blended melt through a core hollow composite spinneret plate, cooling and forming the sprayed filaments through annular cooling air, oiling, winding the filaments, allowing the filaments to fall into a filament containing barrel, and balancing the filaments for a period of time; then the HDPE-PET multi-time hydrophilic composite short fiber is prepared by bundling, dipping, stretching, curling, shaping and cutting.
As a further improvement of the invention, the weight ratio of the HDPE melt in the step (1) to the blending melt in the step (2) is 50: 50.
As a further improved technical scheme of the invention, the proportion of the CO-PET polyester melt in the blended melt of the conventional polyester and the CO-PET polyester is 1-2.5%.
As a further improved technical scheme of the invention, the spinning forming temperature is 292-296 ℃, the cooling air temperature is 35 ℃, the cooling air speed is 1.6-1.8m/s, the cooling distance is 80mm, and the cooling height is 300 mm.
As a further improved technical scheme of the invention, a double-row oil applying wheel is adopted for applying oil after forming, the PH value of oil water for applying oil is not less than 8.0, the temperature of the oil water is 45-48 ℃, the oil water is prepared by mixing the oil agent and water, the concentration of the oil agent in the oil water is 2.2%, the oil-water content of tows is 22-26%, and the balance time of a filament containing barrel is 24 hours.
As a further improved technical scheme of the invention, during dipping, the PH value of oil water in the oil immersion groove is not less than 8.0, and the temperature of the oil water in the oil immersion groove is 95-98 ℃.
As a further improved technical scheme of the invention, the stretching comprises two times of stretching, wherein the two times of stretching are primary stretching and secondary stretching respectively, the primary stretching is 2.6-3.0 times, and the secondary stretching is 1.6-2.0 times.
As a further improved technical scheme of the invention, in the two times of stretching, the primary stretching oil bath is 93-96 ℃, and the secondary stretching steam heating temperature is 105-115 ℃.
As a further improved technical scheme of the invention, the drawing speed is 100-120 m/min.
As a further improved technical scheme of the invention, the setting temperature is 110-125 ℃.
The invention has the beneficial effects that:
the preparation method of the invention leads the inner wall (core layer) of the hollow fiber to generate micropores through alkali decrement, greatly increases the specific surface area, enlarges the suction amount and the attachment area of hydrophilic groups, greatly improves the water suction amount of the fiber, and has unique hydrophilic function for many times.
Drawings
FIG. 1 is a schematic cross-sectional view of a multi-hydrophilic HDPE-PET composite staple fiber of the present invention.
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The following further description of embodiments of the invention is made with reference to the accompanying drawings:
example 1:
as shown in fig. 2, this embodiment provides a method for preparing a HDPE-PET multi-hydrophilic composite staple fiber, which includes the following steps:
(1) feeding the melt of HDPE melt-extruded by the screw into a spinning manifold A as a fiber skin layer;
(2) the blended melt obtained by blending the conventional polyester and CO-PET polyester (alkali-soluble polyester), drying and screw melt extrusion is sent into a spinning manifold B to be used as a core layer of fiber;
(3) respectively metering the HDPE melt in the step (1) and the blended melt in the step (2), feeding the HDPE melt and the blended melt into a spinning assembly, spraying the HDPE melt and the blended melt through a core hollow composite spinneret plate, cooling and forming the sprayed filaments through annular cooling air, oiling, winding the filaments, allowing the filaments to fall into a filament containing barrel, and balancing the filaments for a period of time; then the HDPE-PET multi-time hydrophilic composite short fiber is prepared by bundling, dipping, stretching, curling, shaping and cutting. The cross section of the HDPE-PET multi-hydrophilic composite short fiber is shown in figure 1, wherein 1 is a component A, specifically HDPE, 2 is a component B, specifically PET (PET is obtained by blending conventional polyester and CO-PET polyester), and 3 is a hollow part.
The weight ratio of the HDPE melt in the step (1) to the blending melt in the step (2) is 50: 50.
The proportion of the CO-PET polyester melt in the blended melt of the conventional polyester and the CO-PET polyester is 1%, and the fiber obtained by blending spinning is fully considered, so that the fiber performance is ensured, and the requirement of micropores after alkali weight reduction is met.
The spinning forming temperature is 292 ℃, the cooling air temperature is 35 ℃, the cooling air speed is 1.6m/s, the cooling distance is 80mm, and the cooling height is 300 mm.
After forming, double rows of oiling wheels are adopted for oiling, the pH value of oil-water (namely oil preparation water) for oiling is not less than 8.0, the temperature of the oil-water is 45 ℃, the oil-water is prepared by mixing the oil preparation and the water, the concentration of the oil preparation in the oil-water is 2.2%, the oil-water content of the filament bundle is 22%, and the balance time of a filament containing barrel is 24 hours.
During dipping, the PH value of oil water in the oil dipping tank is not less than 8.0, specifically 9.5, and the oil water temperature of the oil dipping tank is 98 ℃.
The stretching is carried out twice, the total stretching is controlled to be 4.8-5.4 times, the two-time stretching is respectively primary stretching and secondary stretching, wherein the primary stretching is 2.6 times, and the secondary stretching is 1.6 times. The two times of stretching adopt one bath and one steam for secondary heating, namely the temperature of the primary stretching oil bath is 93 ℃, and the temperature of the secondary stretching steam heating is 105 ℃. The drawing speed was 100 m/min. As shown in fig. 2, the stretching between the first stretcher and the second stretcher is primary stretching, and the stretching between the second stretcher and the third stretcher is secondary stretching.
The heat-setting temperature was 110 ℃.
The HDPE-PET multi-hydrophilic composite short fiber prepared by the embodiment is a composite sheath-core hollow short fiber, the hollow rate reaches 20-28%, and the specific surface area of the fiber is increased.
Wherein the preparation method of the conventional polyester comprises the following steps: blending purified terephthalic acid and ethylene glycol according to a molar ratio of 1.2, then carrying out esterification reaction, wherein the esterification reaction temperature is 263 ℃, the pressure is 0.07MPa relative pressure, feeding the esterification reaction product into a pre-shrinking reaction kettle, controlling the temperature of an oligomer pipeline to be 268 ℃, simultaneously, adding a titanium catalyst blended in the ethylene glycol and titanium dioxide blended in the ethylene glycol into the oligomer pipeline by using an injector, carrying out pre-polycondensation reaction, wherein the pre-polycondensation reaction temperature is 268 ℃, the reaction pressure is 10Kpa, the titanium catalyst contains 40PPM of polyester content, the ratio of the titanium catalyst added in the esterification step and the polycondensation step is 3:7, feeding the pre-shrunk material into a final polymerization kettle, carrying out final polycondensation reaction, the temperature of the final polymerization kettle is 273 ℃, the reaction pressure is an absolute pressure of vacuum not less than 200Pa, the obtained melt intrinsic viscosity is 0.67dl/g, the temperature is 283 ℃, the final polycondensation product is a conventional polyester melt, and preparing the conventional polyester melt into conventional polyester chips.
The CO-PET copolyester is copolymerized by taking refined terephthalic acid and ethylene glycol as basic raw materials, and is characterized by containing diethyl isophthalate-5-sodium benzenesulfonate-1 and polyethylene glycol, and specifically comprising the following components:
mixing and pulping the purified terephthalic acid and the ethylene glycol according to the mol ratio of 1.3, adding an esterification catalyst, a heat stabilizer and an antioxidant into the slurry, and sending the mixture into an esterification kettle for esterification reaction. The esterification reaction is carried out under normal pressure, the temperature is 250 ℃, and the time is 4-6 hours (the reaction end point is determined according to the distillation amount of the esterification water). Manganese acetate is adopted as an esterification catalyst, and the addition amount of the manganese acetate is 0.3 percent of the weight of the polyester; the heat stabilizer adopts trimethyl phosphate, and the adding amount is 0.01 percent of the weight of the polyester; antioxidant 1010 was added in an amount of 0.0004% by weight of the polyester. Feeding the esterified product into a polymerization kettle, adding 4 percent of sodium diethyl isophthalate-5-benzenesulfonate-1 in an amount which is equal to the total molar amount of the purified terephthalic acid and the ethylene glycol, adding 7 percent of polyethylene glycol with the average molecular weight of 2000 in an amount which is equal to the weight of the polyester, and continuing to polymerize after stirring. In the low vacuum stage of the condensation reaction, the temperature is controlled at 255 ℃ and the time is 1-2 hours; and in the high vacuum stage, the negative pressure of the kettle is below 25 MPa, the temperature is controlled to be 279-281 ℃, and the time is 2-3 hours. And preparing the obtained polyester melt into polyester chips.
Example 2:
as shown in fig. 2, this embodiment provides a method for preparing a HDPE-PET multi-hydrophilic composite staple fiber, which includes the following steps:
(1) feeding the melt of HDPE melt-extruded by the screw into a spinning manifold A as a fiber skin layer;
(2) the blended melt obtained by blending the conventional polyester and CO-PET polyester (alkali-soluble polyester), drying and screw melt extrusion is sent into a spinning manifold B to be used as a core layer of fiber;
(3) respectively metering the HDPE melt in the step (1) and the blended melt in the step (2), feeding the HDPE melt and the blended melt into a spinning assembly, spraying the HDPE melt and the blended melt through a core hollow composite spinneret plate, cooling and forming the sprayed filaments through annular cooling air, oiling, winding the filaments, allowing the filaments to fall into a filament containing barrel, and balancing the filaments for a period of time; then the HDPE-PET multi-time hydrophilic composite short fiber is prepared by bundling, dipping, stretching, curling, shaping and cutting. The cross section of the HDPE-PET multi-hydrophilic composite short fiber is shown in figure 1, wherein 1 is a component A, specifically HDPE, 2 is a component B, specifically PET (PET is obtained by blending conventional polyester and CO-PET polyester), and 3 is a hollow part.
The weight ratio of the HDPE melt in the step (1) to the blending melt in the step (2) is 50: 50.
The proportion of the CO-PET polyester melt in the blended melt of the conventional polyester and the CO-PET polyester is 1.5%, and the fiber obtained by blending spinning is fully considered, so that the fiber performance is ensured, and the requirement of micropores after alkali weight reduction is met.
The spinning forming temperature is 294 ℃, the cooling air temperature is 35 ℃, the cooling air speed is 1.7m/s, the cooling distance is 80mm, and the cooling height is 300 mm.
After forming, double rows of oiling wheels are adopted for oiling, the pH value of oil-water (namely water for preparing oiling agent) for oiling is not less than 8.0, the temperature of the oil-water is 46 ℃, the oil-water is prepared by mixing the oiling agent and water, the concentration of the oil-water in the oil-water is 2.2%, the oil-water content of the filament bundle is 24%, and the balance time of a filament containing barrel is 24 hours.
During dipping, the pH value of oil water in the oil dipping tank is not less than 8.0 and is 9.0, and the temperature of the oil water in the oil dipping tank is 97 ℃.
The stretching adopts two times of stretching: the total stretching is controlled to be 4.8-5.4 times, and the two-time stretching is primary stretching and secondary stretching respectively, wherein the primary stretching is 2.8 times, and the secondary stretching is 1.8 times. The two times of stretching adopt one bath and one steam for secondary heating, namely the primary stretching oil bath is 94 ℃, and the secondary stretching steam heating temperature is 110 ℃. The drawing speed was 110 m/min. As shown in fig. 2, the stretching between the first stretcher and the second stretcher is primary stretching, and the stretching between the second stretcher and the third stretcher is secondary stretching.
The heat-setting temperature was 115 ℃.
The preparation method of the conventional polyester and the preparation method of the CO-PET polyester of this example are the same as those of example 1.
Example 3:
as shown in fig. 2, this embodiment provides a method for preparing a HDPE-PET multi-hydrophilic composite staple fiber, which includes the following steps:
(1) feeding the melt of HDPE melt-extruded by the screw into a spinning manifold A as a fiber skin layer;
(2) the blended melt obtained by blending the conventional polyester and CO-PET polyester (alkali-soluble polyester), drying and screw melt extrusion is sent into a spinning manifold B to be used as a core layer of fiber;
(3) respectively metering the HDPE melt in the step (1) and the blended melt in the step (2), feeding the HDPE melt and the blended melt into a spinning assembly, spraying the HDPE melt and the blended melt through a core hollow composite spinneret plate, cooling and forming the sprayed filaments through annular cooling air, oiling, winding the filaments, allowing the filaments to fall into a filament containing barrel, and balancing the filaments for a period of time; then the HDPE-PET multi-time hydrophilic composite short fiber is prepared by bundling, dipping, stretching, curling, shaping and cutting. The cross section of the HDPE-PET multi-hydrophilic composite short fiber is shown in figure 1, wherein 1 is a component A, specifically HDPE, 2 is a component B, specifically PET (PET is obtained by blending conventional polyester and CO-PET polyester), and 3 is a hollow part.
The weight ratio of the HDPE melt in the step (1) to the blending melt in the step (2) is 50: 50.
The proportion of the CO-PET polyester melt in the blended melt of the conventional polyester and the CO-PET polyester is 2.0%, and the fiber obtained by blending spinning is fully considered, so that the fiber performance is ensured, and the requirement of micropores after alkali weight reduction is met.
The spinning forming temperature is 295 ℃, the cooling air temperature is 35 ℃, the cooling air speed is 1.7m/s, the cooling distance is 80mm, and the cooling height is 300 mm.
After forming, double rows of oiling wheels are adopted for oiling, the pH value of oil-water (namely water for preparing oiling agent) for oiling is not less than 8.0, the temperature of the oil-water is 47 ℃, the oil-water is prepared by mixing the oiling agent and water, the concentration of the oiling agent in the oil-water is 2.2%, the oil-water content of the filament bundle is 24%, and the balance time of a filament containing barrel is 24 hours.
During dipping, the PH value of oil water in the oil dipping tank is not less than 8.0, specifically 8.5, and the oil water temperature of the oil dipping tank is 96 ℃.
The stretching adopts two times of stretching: the total stretching is controlled to be 4.8-5.4 times, and the two-time stretching is primary stretching and secondary stretching respectively, wherein the primary stretching is 3.0 times, and the secondary stretching is 2.0 times. The secondary stretching adopts one-bath one-steam secondary heating, namely the primary stretching oil bath is 95 ℃, and the secondary stretching steam heating temperature is 110 ℃. The drawing speed was 115 m/min. As shown in fig. 2, the stretching between the first stretcher and the second stretcher is primary stretching, and the stretching between the second stretcher and the third stretcher is secondary stretching.
The heat setting temperature was 120 ℃.
The preparation method of the conventional polyester and the preparation method of the CO-PET polyester of this example are the same as those of example 1.
Example 4:
as shown in fig. 2, this embodiment provides a method for preparing a HDPE-PET multi-hydrophilic composite staple fiber, which includes the following steps:
(1) feeding the melt of HDPE melt-extruded by the screw into a spinning manifold A as a fiber skin layer;
(2) the blended melt obtained by blending the conventional polyester and CO-PET polyester (alkali-soluble polyester), drying and screw melt extrusion is sent into a spinning manifold B to be used as a core layer of fiber;
(3) respectively metering the HDPE melt in the step (1) and the blended melt in the step (2), feeding the HDPE melt and the blended melt into a spinning assembly, spraying the HDPE melt and the blended melt through a core hollow composite spinneret plate, cooling and forming the sprayed filaments through annular cooling air, oiling, winding the filaments, allowing the filaments to fall into a filament containing barrel, and balancing the filaments for a period of time; then the HDPE-PET multi-time hydrophilic composite short fiber is prepared by bundling, dipping, stretching, curling, shaping and cutting. The cross section of the HDPE-PET multi-hydrophilic composite short fiber is shown in figure 1, wherein 1 is a component A, specifically HDPE, 2 is a component B, specifically PET (PET is obtained by blending conventional polyester and CO-PET polyester), and 3 is a hollow part.
The weight ratio of the HDPE melt in the step (1) to the blending melt in the step (2) is 50: 50.
The proportion of the CO-PET polyester melt in the blended melt of the conventional polyester and the CO-PET polyester is 2.5%, and the fiber obtained by blending spinning is fully considered, so that the fiber performance is ensured, and the requirement of micropores after alkali weight reduction is met.
The spinning forming temperature is 296 ℃, the cooling air temperature is 35 ℃, the cooling air speed is 1.8m/s, the cooling distance is 80mm, and the cooling height is 300 mm.
After forming, double rows of oiling wheels are adopted for oiling, the pH value of oil-water (namely oil preparation water) for oiling is not less than 8.0, the temperature of the oil-water is 48 ℃, the oil-water is obtained by mixing the oil and water, the concentration of the oil in the oil-water is 2.2%, the oil-water content of the filament bundle is 26%, and the balance time of a filament containing barrel is 24 hours.
During dipping, the PH value of oil water in the oil dipping tank is not less than 8.0, specifically 8.0, and the oil water temperature of the oil dipping tank is 95 ℃.
The stretching adopts two times of stretching: the total stretching is controlled to be 4.8-5.4 times, and the two-time stretching is primary stretching and secondary stretching respectively, wherein the primary stretching is 3.0 times, and the secondary stretching is 2.0 times. The two times of stretching adopt one bath and one steam for secondary heating, namely the temperature of the primary stretching oil bath is 96 ℃, and the temperature of the secondary stretching steam heating is 115 ℃. The drawing speed was 120 m/min. As shown in fig. 2, the stretching between the first stretcher and the second stretcher is primary stretching, and the stretching between the second stretcher and the third stretcher is secondary stretching.
The heat-setting temperature was 125 ℃.
The preparation method of the conventional polyester and the preparation method of the CO-PET polyester of this example are the same as those of example 1.
Alkali decrement is carried out on the core layer (the inner wall of the hollow fiber) in the stretching process, so that micropores are generated in the fiber, and the specific surface area is greatly increased. After absorbing the soft water groups, the fiber has unique multiple hydrophilic functions.
The alkali decrement of the CO-PET polyester is that under certain conditions, the alkaline hydrolysis rate can reach more than 99 percent, the technical product has no requirement on the alkaline hydrolysis rate, micropores can be generated only by alkali decrement on the inner wall of the hollow fiber, and the specific method is adopted: 1. maintaining the pH value of the oil water in the oil immersion groove to be not less than 8.0 and 2, wherein the temperature of the oil water in the oil immersion groove is 95-98 ℃; 3. limiting the stretching speed to ensure a certain time; 4. then, the weight loss was further obtained by oil bath stretching.
Table 1 is a process, fiber property analysis table:
table 2 is a hydrophilicity experiments data analysis table:
the scope of the present invention includes, but is not limited to, the above embodiments, and the present invention is defined by the appended claims, and any alterations, modifications, and improvements that may occur to those skilled in the art are all within the scope of the present invention.
Claims (10)
1. A preparation method of HDPE-PET multi-time hydrophilic composite short fiber is characterized by comprising the following steps:
(1) feeding the melt of HDPE melt-extruded by the screw into a spinning manifold A as a fiber skin layer;
(2) the blended melt obtained by blending the conventional polyester and the CO-PET polyester and then drying and screw melting and extruding is sent into a spinning manifold B as a core layer of the fiber;
(3) respectively metering the HDPE melt in the step (1) and the blended melt in the step (2), feeding the HDPE melt and the blended melt into a spinning assembly, spraying the HDPE melt and the blended melt through a core hollow composite spinneret plate, cooling and forming the sprayed filaments through annular cooling air, oiling, winding the filaments, allowing the filaments to fall into a filament containing barrel, and balancing the filaments for a period of time; then the HDPE-PET multi-time hydrophilic composite short fiber is prepared by bundling, dipping, stretching, curling, shaping and cutting.
2. The method for preparing HDPE-PET multi-hydrophilic composite short fiber according to claim 1, wherein the weight ratio of the HDPE melt in the step (1) to the blended melt in the step (2) is 50: 50.
3. The method for preparing HDPE-PET multi-hydrophilic composite staple fiber according to claim 1, wherein the proportion of the CO-PET polyester melt in the blended melt of conventional polyester and CO-PET polyester is 1-2.5%.
4. The method for preparing HDPE-PET multiple hydrophilic composite short fiber according to claim 1, wherein the spinning forming temperature is 292-296 ℃, the cooling air temperature is 35 ℃, the cooling air speed is 1.6-1.8m/s, the cooling distance is 80mm, and the cooling height is 300 mm.
5. The method for preparing HDPE-PET multi-hydrophilic composite short fiber according to claim 1, wherein the HDPE-PET multi-hydrophilic composite short fiber is prepared by applying oil on a double-row oil applying wheel after molding, the pH value of oil-water for applying oil is not less than 8.0, the temperature of the oil-water is 45-48 ℃, the oil-water is obtained by mixing oil agent and water, the concentration of the oil agent in the oil-water is 2.2%, the oil-water content of the filament bundle is 22-26%, and the equilibrium time of a filament containing barrel is 24 hours.
6. The method for preparing HDPE-PET multiple hydrophilic composite short fiber according to claim 1, wherein the immersion oil bath oil water pH is not less than 8.0, and the immersion oil bath oil water temperature is 95-98 ℃.
7. The method of making HDPE-PET multi-hydrophilic composite staple fiber according to claim 1, characterized in that the drawing comprises two drawing steps, the two drawing steps being a primary drawing step and a secondary drawing step, wherein the primary drawing step is 2.6 to 3.0 times and the secondary drawing step is 1.6 to 2.0 times.
8. The method for preparing HDPE-PET multi-hydrophilic composite staple fiber according to claim 7, wherein in the two-time stretching, the primary stretching oil bath is 93-96 ℃, and the secondary stretching steam heating temperature is 105-115 ℃.
9. The method for preparing HDPE-PET multi-hydrophilic composite staple fiber according to claim 1, wherein the drawing speed is 100-120 m/min.
10. The method for preparing HDPE-PET multi-hydrophilic composite staple fiber according to claim 1, wherein the setting temperature is 110-125 ℃.
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