CN114214742B - Preparation method of HDPE-PET multiple hydrophilic composite short fiber - Google Patents
Preparation method of HDPE-PET multiple hydrophilic composite short fiber Download PDFInfo
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- CN114214742B CN114214742B CN202111552772.2A CN202111552772A CN114214742B CN 114214742 B CN114214742 B CN 114214742B CN 202111552772 A CN202111552772 A CN 202111552772A CN 114214742 B CN114214742 B CN 114214742B
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- 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 multiple hydrophilic composite short fibers, which comprises the following steps: the HDPE melt is sent into a spinning box A through screw melting extrusion, and is used as a fiber sheath; the common polyester and the CO-PET polyester are mixed and then are sent into a spinning box B to be used as a core layer of the fiber through a dry blending melt extruded by a screw melting; the HDPE melt and the blending melt are respectively metered and then enter a spinning component, and are sprayed out through a skin core hollow composite spinneret plate, and sprayed yarn is cooled and molded through annular cooling air, oiled and coiled to fall into a yarn containing barrel and then balanced for a period of time; and then the HDPE-PET multiple hydrophilic composite short fiber is prepared through bundling, dipping, stretching, curling, shaping and cutting. The invention makes the fiber generate micropores, greatly increases the specific surface area, enlarges the suction amount and the attachment area of hydrophilic groups, greatly improves the water absorption capacity of the fiber, and has unique multiple hydrophilic functions.
Description
Technical Field
The invention relates to the field of spinning, in particular to a preparation method of HDPE-PET multiple hydrophilic composite short fibers.
Background
Objective demands and supply potential created by three trends of urbanization, marketization and internationalization are basic power sources for rapid development of economy, and consumer product markets are rapidly growing with the development of Chinese economy. The sanitary product is one of daily necessities, has close relation with consumers, and with the improvement of living standard, people put more functional requirements on the sanitary material, and the sanitary material is expected to have good water absorption function and needs multiple hydrophilisms.
In recent years, the Chinese sanitation market is showing a high-speed growth to high-end products, and especially, the baby diaper is developing towards softer, thinner and more care skin. Nowadays, hot air nonwovens find large area applications in the diaper market, such as dotting, punching, 3D facing nonwovens, and a large number of new nonwovens are used for diapers. Consumer demand has driven manufacturers and suppliers to continually develop and develop improvements. 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 the living standard of people, the consumption demands of the sanitary napkins and the baby diapers in China are obviously increased, and the sanitary napkins and the baby diapers are required to be hydrophilic for many times and dry. The existing hydrophilic function is mainly to improve the oil quantity on the fiber, but the surface adsorption capacity is limited, and the characteristic that the hydrophilic effect is poor for a plurality of times exists is achieved, so that the HDPE-PET multi-time hydrophilic composite short fiber is manufactured according to the problems, and meanwhile, the HDPE-PET multi-time hydrophilic composite short fiber has the hydrophilic effect for a plurality of times, ensures the dry and refreshing effect, and meets the requirements of modern consumers.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the preparation method of the HDPE-PET multi-time hydrophilic composite short fiber, which enables the fiber to generate micropores, greatly increases the specific surface area, enlarges the suction amount and the attachment area of hydrophilic groups, greatly improves the water absorption capacity of the fiber and has unique multi-time hydrophilic function.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the preparation method of the HDPE-PET multiple hydrophilic composite short fiber comprises the following steps:
(1) The HDPE melt is sent into a spinning box A through screw melting extrusion, and is used as a fiber sheath;
(2) The common polyester and the CO-PET polyester are mixed and then are sent into a spinning box B to be used as a core layer of the fiber through a dry blending melt extruded by a screw melting;
(3) The HDPE melt in the step (1) and the blending melt in the step (2) are respectively metered and then enter a spinning component, and are sprayed out through a skin core hollow composite spinneret plate, and sprayed yarn is cooled and molded through annular cooling air, oiled and coiled to fall into a yarn containing barrel and then are balanced for a period of time; and then the HDPE-PET multiple hydrophilic composite short fiber is prepared through bundling, dipping, stretching, curling, shaping and cutting.
As a further improved technical scheme 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 to the blend 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 300mm.
As a further improved technical scheme of the invention, double-row oiling wheels are adopted for oiling after molding, the PH value of oil water for oiling is not less than 8.0, the temperature of the oil water is 45-48 ℃, the oil water is prepared by mixing 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 balancing time of a silk holding barrel is 24 hours.
As a further improved technical scheme of the invention, the PH value of the oil water in the oil immersion tank is not less than 8.0 during immersion, and the temperature of the oil water in the oil immersion tank is 95-98 ℃.
As a further improved technical scheme of the invention, the stretching comprises two stretching steps, wherein the two stretching steps are primary stretching and secondary stretching, 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-time stretching, the primary stretching oil bath is 93-96 ℃, and the heating temperature of the secondary stretching steam is 105-115 ℃.
As a further improved technical scheme of the invention, the stretching speed is 100-120 m/min.
As a further improved technical scheme of the invention, the shaping temperature is 110-125 ℃.
The beneficial effects of the invention are as follows:
the preparation method of the invention ensures that the inner wall (core layer) of the hollow fiber generates micropores through alkali decrement, the specific surface area is greatly increased, the suction amount and the attachment area of hydrophilic groups are enlarged, the water absorption capacity of the fiber is greatly improved, and the multiple hydrophilic functions are unique.
Drawings
FIG. 1 is a schematic cross-sectional view of the HDPE-PET multiple hydrophilic composite short fiber of the present invention.
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The following is a further description of embodiments of the invention, with reference to the accompanying drawings:
example 1:
as shown in fig. 2, the embodiment provides a preparation method of a HDPE-PET multi-hydrophilic composite short fiber, which comprises the following steps:
(1) The HDPE melt is sent into a spinning box A through screw melting extrusion, and is used as a fiber sheath;
(2) The common polyester and the CO-PET polyester (alkali-soluble polyester) are mixed and then are sent into a spinning box B through a dry and screw melt extrusion blended melt to be used as a core layer of the fiber;
(3) The HDPE melt in the step (1) and the blending melt in the step (2) are respectively metered and then enter a spinning component, and are sprayed out through a skin core hollow composite spinneret plate, and sprayed yarn is cooled and molded through annular cooling air, oiled and coiled to fall into a yarn containing barrel and then are balanced for a period of time; and then the HDPE-PET multiple hydrophilic composite short fiber is prepared through 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, particularly HDPE,2 is a component B, particularly 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 ratio of the CO-PET polyester melt to the blending melt of the conventional polyester and the CO-PET polyester is 1%, fibers obtained by blending yarns are fully considered, the fiber performance is ensured, and the requirement of micropores after alkali decrement 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 300mm.
After forming, the double-row oiling wheel is adopted for oiling, the PH value of oil water (namely, oiling agent 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 oiling agent and water, the concentration of the oiling agent in the oil water is 2.2%, the oil-water content of a silk bundle is 22%, and the balancing time of a silk holding barrel is 24 hours.
During immersion, the pH value of the oil water in the immersion tank is not less than 8.0, specifically 9.5, and the temperature of the oil water in the immersion tank is 98 ℃.
The stretching is performed by two times, the total stretching is controlled to be 4.8-5.4 times, and the two times are respectively performed by primary stretching and secondary stretching, wherein the primary stretching is 2.6 times, and the secondary stretching is 1.6 times. The two stretching adopts one bath and one steam for secondary heating, namely the primary stretching oil bath is 93 ℃ and the secondary stretching steam heating temperature is 105 ℃. The stretching speed was 100 m/min. As shown in fig. 2, wherein the stretching between the first stretching machine and the second stretching machine is primary stretching, and the stretching between the second stretching machine and the third stretching machine 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 conventional polyester is prepared by the following steps: the preparation method comprises the steps of preparing refined terephthalic acid and ethylene glycol according to a molar ratio of 1.2, performing esterification reaction, wherein the esterification reaction temperature is 263 ℃, the pressure is 0.07MPa, the esterification reaction product is fed into a preshrinking reaction kettle, the temperature of an oligomer pipeline is controlled to be 268 ℃, simultaneously, a titanium catalyst prepared in the ethylene glycol and titanium pigment prepared in the ethylene glycol are added into the oligomer pipeline by a syringe to perform preshrinking reaction, the preshrinking control material 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 to the polycondensation step is 3:7, the preshrinking reaction material enters into a final polycondensation reaction kettle, the final polycondensation reaction material temperature is 273 ℃, the reaction pressure is the absolute pressure of vacuum not lower than 200Pa, the obtained melt intrinsic viscosity is 0.67dl/g, the temperature 283 ℃ is the conventional polyester melt, and the conventional polyester melt is prepared into conventional polyester chips.
The CO-PET copolyester is prepared by copolymerizing refined terephthalic acid and ethylene glycol as basic raw materials, and is characterized by comprising sodium m-diethyl phthalate-5-benzenesulfonate-1 and polyethylene glycol, and specifically comprises the following steps:
mixing and pulping refined terephthalic acid and ethylene glycol according to a molar 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 end point of the reaction is determined according to the distilled amount of the esterification water). The esterification catalyst adopts manganese acetate, and the adding amount is 0.3% of the weight of the polyester; the heat stabilizer adopts trimethyl phosphate, and the addition amount of the trimethyl phosphate is 0.01% of the weight of the polyester; the antioxidant is 1010 and the adding amount is 0.0004 percent of the weight of the polyester. The esterified substance is sent into a polymerization kettle, and the sodium metadicarboxylic acid diethyl ester-5-benzenesulfonate-1 accounting for 4 percent of the total mole of the refined terephthalic acid and the ethylene glycol is added, and the polyethylene glycol accounting for 7 percent of the weight of the polyester and having average molecular weight of 2000 is added, and the mixture is stirred and then continuously polymerized according to the mode. The condensation reaction is carried out in a low vacuum stage, the temperature is controlled at 255 ℃ and the time is 1-2 hours; in the high vacuum stage, the negative pressure of the kettle is below 25 megapascals, 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, the embodiment provides a preparation method of a HDPE-PET multi-hydrophilic composite short fiber, which comprises the following steps:
(1) The HDPE melt is sent into a spinning box A through screw melting extrusion, and is used as a fiber sheath;
(2) The common polyester and the CO-PET polyester (alkali-soluble polyester) are mixed and then are sent into a spinning box B through a dry and screw melt extrusion blended melt to be used as a core layer of the fiber;
(3) The HDPE melt in the step (1) and the blending melt in the step (2) are respectively metered and then enter a spinning component, and are sprayed out through a skin core hollow composite spinneret plate, and sprayed yarn is cooled and molded through annular cooling air, oiled and coiled to fall into a yarn containing barrel and then are balanced for a period of time; and then the HDPE-PET multiple hydrophilic composite short fiber is prepared through 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, particularly HDPE,2 is a component B, particularly 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 ratio of the CO-PET polyester melt to the blending melt of the conventional polyester and the CO-PET polyester is 1.5%, fibers obtained by blending yarns are fully considered, the fiber performance is ensured, and the requirement of micropores after alkali decrement 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 300mm.
After molding, the double-row oiling wheel is adopted for oiling, the PH value of oil water (namely oiling agent preparation water) for oiling is not less than 8.0, the oil water temperature is 46 ℃, the oil water is prepared by mixing oiling agent and water, the concentration of the oiling agent in the oil water is 2.2%, the oil water content of the filament bundles is 24%, and the balancing time of the filament holding barrel is 24 hours.
During immersion, the pH value of the oil water in the immersion tank is not less than 8.0 and is 9.0, and the temperature of the oil water in the immersion tank is 97 ℃.
The stretching is carried out by twice stretching: the total stretching is controlled to be 4.8-5.4 times, and the two times of stretching are respectively primary stretching and secondary stretching, wherein the primary stretching is 2.8 times, and the secondary stretching is 1.8 times. The two stretching adopts 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 stretching speed was 110 m/min. As shown in fig. 2, wherein the stretching between the first stretching machine and the second stretching machine is primary stretching, and the stretching between the second stretching machine and the third stretching machine is secondary stretching.
The heat setting temperature was 115 ℃.
The conventional polyester production method of this example and the CO-PET polyester production method are the same as in example 1.
Example 3:
as shown in fig. 2, the embodiment provides a preparation method of a HDPE-PET multi-hydrophilic composite short fiber, which comprises the following steps:
(1) The HDPE melt is sent into a spinning box A through screw melting extrusion, and is used as a fiber sheath;
(2) The common polyester and the CO-PET polyester (alkali-soluble polyester) are mixed and then are sent into a spinning box B through a dry and screw melt extrusion blended melt to be used as a core layer of the fiber;
(3) The HDPE melt in the step (1) and the blending melt in the step (2) are respectively metered and then enter a spinning component, and are sprayed out through a skin core hollow composite spinneret plate, and sprayed yarn is cooled and molded through annular cooling air, oiled and coiled to fall into a yarn containing barrel and then are balanced for a period of time; and then the HDPE-PET multiple hydrophilic composite short fiber is prepared through 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, particularly HDPE,2 is a component B, particularly 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 ratio of the CO-PET polyester melt to the blending melt of the conventional polyester and the CO-PET polyester is 2.0%, fibers obtained by blending yarns are fully considered, the fiber performance is ensured, and the requirement of micropores after alkali decrement 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 300mm.
After molding, the double-row oiling wheel is adopted for oiling, the PH value of oil water (namely oil agent preparation water) for oiling is not less than 8.0, the oil water temperature is 47 ℃, the oil water is prepared by mixing oil agent and water, the concentration of the oil agent in the oil water is 2.2%, the oil water content of a silk bundle is 24%, and the balancing time of a silk holding barrel is 24 hours.
During immersion, the pH value of the oil water in the immersion tank is not less than 8.0, specifically 8.5, and the temperature of the oil water in the immersion tank is 96 ℃.
The stretching is carried out by twice stretching: the total stretching is controlled to be 4.8-5.4 times, and the two times of stretching are respectively primary stretching and secondary stretching, wherein the primary stretching is 3.0 times, and the secondary stretching is 2.0 times. The second stretching adopts one-bath one-steam secondary heating, namely the first stretching oil bath is 95 ℃ and the second stretching steam heating temperature is 110 ℃. The stretching speed was 115 m/min. As shown in fig. 2, wherein the stretching between the first stretching machine and the second stretching machine is primary stretching, and the stretching between the second stretching machine and the third stretching machine is secondary stretching.
The heat setting temperature was 120 ℃.
The conventional polyester production method of this example and the CO-PET polyester production method are the same as in example 1.
Example 4:
as shown in fig. 2, the embodiment provides a preparation method of a HDPE-PET multi-hydrophilic composite short fiber, which comprises the following steps:
(1) The HDPE melt is sent into a spinning box A through screw melting extrusion, and is used as a fiber sheath;
(2) The common polyester and the CO-PET polyester (alkali-soluble polyester) are mixed and then are sent into a spinning box B through a dry and screw melt extrusion blended melt to be used as a core layer of the fiber;
(3) The HDPE melt in the step (1) and the blending melt in the step (2) are respectively metered and then enter a spinning component, and are sprayed out through a skin core hollow composite spinneret plate, and sprayed yarn is cooled and molded through annular cooling air, oiled and coiled to fall into a yarn containing barrel and then are balanced for a period of time; and then the HDPE-PET multiple hydrophilic composite short fiber is prepared through 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, particularly HDPE,2 is a component B, particularly 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 ratio of the CO-PET polyester melt to the blending melt of the conventional polyester and the CO-PET polyester is 2.5%, fibers obtained by blending yarns are fully considered, the fiber performance is ensured, and the requirement of micropores after alkali decrement 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 300mm.
After molding, the double-row oiling wheel is adopted for oiling, the PH value of oil water (namely, oil agent 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 oil agent and water, the concentration of the oil agent in the oil water is 2.2%, the oil-water content of a silk bundle is 26%, and the balancing time of a silk holding barrel is 24 hours.
During immersion, the pH value of the oil water in the immersion tank is not less than 8.0, specifically 8.0, and the temperature of the oil water in the immersion tank is 95 ℃.
The stretching is carried out by twice stretching: the total stretching is controlled to be 4.8-5.4 times, and the two times of stretching are respectively primary stretching and secondary stretching, wherein the primary stretching is 3.0 times, and the secondary stretching is 2.0 times. The two stretching adopts one bath and one steam for secondary heating, namely the primary stretching oil bath is 96 ℃ and the secondary stretching steam heating temperature is 115 ℃. The stretching speed was 120 m/min. As shown in fig. 2, wherein the stretching between the first stretching machine and the second stretching machine is primary stretching, and the stretching between the second stretching machine and the third stretching machine is secondary stretching.
The heat setting temperature was 125 ℃.
The conventional polyester production method of this example and the CO-PET polyester production method are the same as in example 1.
In the stretching process, the core layer (the inner wall of the hollow fiber) is subjected to alkali deweighting, so that micropores are formed in the fiber, and the specific surface area is greatly increased. After the soft water group is inhaled, the fiber has unique multiple hydrophilic functions.
The alkali decrement of the CO-PET polyester can reach more than 99 percent under certain conditions, the product of the technology has no requirement on the alkali hydrolysis rate, micropores can be generated only by the alkali decrement on the inner wall of the hollow fiber, and the specific method is adopted: 1. the PH value of the oil water in the oil soaking tank is kept to be not less than 8.0,2, and the temperature of the oil water in the oil soaking tank is kept to be 95-98 ℃; 3. limiting the stretching speed to ensure a certain time; 4. then, further reduction was obtained by oil bath stretching.
Table 1 is a process and fiber performance analysis table:
table 2 is a table of hydrophilicity experimental data analysis:
the scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.
Claims (7)
1. The preparation method of the HDPE-PET multiple hydrophilic composite short fiber is characterized by comprising the following steps of:
(1) The HDPE melt is sent into a spinning box A through screw melting extrusion, and is used as a fiber sheath;
(2) The common polyester and the CO-PET polyester are mixed and then are sent into a spinning box B to be used as a core layer of the fiber through a dry blending melt extruded by a screw melting;
(3) The HDPE melt in the step (1) and the blending melt in the step (2) are respectively metered and then enter a spinning component, and are sprayed out through a skin core hollow composite spinneret plate, and sprayed yarn is cooled and molded through annular cooling air, oiled and coiled to fall into a yarn containing barrel and then are balanced for a period of time; then, bundling, dipping, stretching, curling, shaping and cutting to prepare the HDPE-PET multiple hydrophilic composite short fiber;
the ratio of the CO-PET polyester melt to the blend melt of the conventional polyester and the CO-PET polyester is 1-2.5%;
after forming, oiling by adopting a double-row oiling wheel, wherein the PH value of oil water for oiling 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 tows is 22-26%, and the balancing time of a silk holding barrel is 24 hours;
during immersion, the pH value of the oil water in the immersion tank is not less than 8.0, and the temperature of the oil water in the immersion tank is 95-98 ℃.
2. The method for producing a multi-hydrophilic composite short fiber of HDPE-PET according to claim 1, wherein the weight ratio of the HDPE melt of step (1) to the blend melt of step (2) is 50:50.
3. The method for producing a multi-hydrophilic composite short fiber of HDPE-PET 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 300mm.
4. The method for producing a multi-hydrophilic composite short fiber of HDPE-PET according to claim 1, wherein the stretching includes two stretching steps, which are a primary stretching and a secondary stretching, respectively, wherein the primary stretching is 2.6 to 3.0 times and the secondary stretching is 1.6 to 2.0 times.
5. The method for producing a multi-hydrophilic composite short fiber of HDPE-PET according to claim 4, wherein the primary stretching oil bath is 93 to 96 ℃ and the secondary stretching steam heating temperature is 105 to 115 ℃ in the two stretching.
6. The method for producing a multi-hydrophilic composite short fiber of HDPE-PET according to claim 1, wherein the stretching speed is 100 to 120 m/min.
7. The method for producing a multi-hydrophilic composite short fiber of HDPE-PET according to claim 1, wherein the setting temperature is 110 to 125 ℃.
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