CN111793832B - Method for removing oligomer in preparation process of regenerated polyester filament yarn melt - Google Patents
Method for removing oligomer in preparation process of regenerated polyester filament yarn melt Download PDFInfo
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- CN111793832B CN111793832B CN202010610390.XA CN202010610390A CN111793832B CN 111793832 B CN111793832 B CN 111793832B CN 202010610390 A CN202010610390 A CN 202010610390A CN 111793832 B CN111793832 B CN 111793832B
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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
- D01D1/00—Treatment of filament-forming or like material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0073—Degasification of liquids by a method not covered by groups B01D19/0005 - B01D19/0042
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
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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
- D01D1/00—Treatment of filament-forming or like material
- D01D1/10—Filtering or de-aerating the spinning solution or melt
- D01D1/106—Filtering
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Abstract
The invention relates to a method for removing oligomers in a preparation process of a regenerated polyester filament melt, belonging to the field of spinning. The invention comprises the following steps: s1, drying the regenerated polyester bottle chips; s2, melting the recycled polyester bottle chips; s3, reducing the viscosity of the high-decomposition polymer chain; s4, primary filtering of the regenerated polyester melt; s5, drawing the film under negative pressure; s6, suction separation; s7, filtering and collecting; the S1 includes the following steps: s1a, conveying the treated bottle chips into a boiling type pre-crystallizer for pre-crystallization, heating part of oligomers to form solid particles, and removing and collecting the solid particles through a cyclone dust separator; s1b, and drying the pre-crystallized bottle chips in a drying tower. The full roll rate of the improved product is improved by 10 percent, and the defective rate is reduced by 5 percent.
Description
Technical Field
The invention relates to a method for removing oligomers in a preparation process of a regenerated polyester filament melt, belonging to the field of spinning.
Background
Waste polyester mineral water bottles and edible oil bottles are used as regenerated polyester raw materials, and the regenerated polyester raw materials are subjected to whole bottle cleaning, crushing, friction washing, drying and melting recycling to replace original polyester to produce high-quality polyester filaments, but the regenerated polyester raw materials are subjected to full friction washing, and part of low molecular substances are still remained. For example, the glue for labels of old polyester bottles, saccharides and grease substances in old polyester bottles, residual cleaning agents in washing processes and other substances are attached to polyester raw materials and are difficult to remove, various residual substances are converted into oligomers and mixed in a regenerated polyester melt through high-temperature melting, the oligomers are difficult to remove by a filtering device, the purity of the regenerated polyester melt is reduced, the spinnability of the regenerated polyester is influenced, and high-quality regenerated polyester filaments are difficult to produce.
The kind of oligomer: such as a glue for labeling, a saccharide and an oil in a polyester bottle, and a detergent remaining in a washing process.
Pretreatment of oligomers: some oligomers remained after the initial physical and chemical cleaning and rinsing of the polyester bottles and were still partially difficult to remove by high precision (25 μm) filtration equipment during the melt preparation process.
Effect of oligomer presence: if oligomers are not removed in time during the melt preparation process, the viscosity of a portion of the melt may be reduced after a period of high temperature, resulting in non-uniform melt viscosity. Furthermore, instability is caused to the production during the spinning process, which in turn affects the intrinsic quality of the final product.
In view of this, patent document CN201410642613.5 discloses a filter and a filtering method for removing oligomers from liquid materials.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for removing oligomers in the preparation process of a regenerated polyester filament melt with reasonable structural design.
The technical scheme adopted by the invention for solving the problems is as follows: the method for removing the oligomer in the preparation process of the regenerated polyester filament yarn melt is characterized by comprising the following steps: the method for removing the oligomer in the preparation process of the regenerated polyester filament yarn melt comprises the following steps:
s1, drying the regenerated polyester bottle chips;
s2, melting the recycled polyester bottle chips: the recycled polyester bottle chips have the characteristics of high viscosity, low melting point and small solid volume density, so that the recycled polyester bottle chips are extruded by a melting screw extruder with the length-diameter ratio of 1:30, and the melting screw extruder is controlled by multiple zones;
s3, reducing the viscosity of the high-decomposition polymer chain: adding a solvent into a feed inlet of a melting screw extruder through a solvent adding device to ensure that the adding amount of the solvent is matched with the amount of the regenerated polyester bottle flakes, and adding a solvent to depolymerize macromolecules to dilute the melt so as to ensure that oligomers are easy to seep out of the melt;
s4, primary filtration of the regenerated polyester melt: extruding the molten melt from the melting screw extruder into a filter for primary filtration, filtering out particulate matters with the part being more than the filtration precision of the filter after the primary filtration, and filtering out gasified and liquefied oligomers which still remain in the melt and cannot be filtered out in a filtration mode;
s5, negative-pressure film drawing: introducing the melt after primary filtration into a high-temperature negative-pressure film drawing device through a melt inlet pipeline in a negative-pressure mode, so that the melt moves to form a film sample in the negative-pressure film drawing device and the oligomer is fully exposed, and then separating the oligomer from the film sample melt by utilizing the characteristics that the high-molecular substance has high elasticity, high viscosity, no gas state and can be gasified by the oligomer at high temperature and keeping the negative-pressure film drawing device in a negative-pressure state;
s6, suction separation: the oligomer separated from the melt enters an oligomer separator through a suction device in a gaseous state, and the oligomer-containing gas generates a water bath effect when passing through a plurality of groups of spray headers for spraying the solvent in the oligomer separator, so that the oligomer is brought into a solvent storage tank by the solvent;
s7, filtering and collecting: refluxing the oligomer-containing solvent into a solvent storage tank, carrying out condensation, precipitation and filter screen isolation in the solvent storage tank to remove the oligomer, feeding the oligomer-removed solvent to a spray header in the oligomer separator again through a solvent circulating pump for recycling, and collecting the oligomer in an oligomer collecting tank;
the method for removing the oligomer in the preparation process of the regenerated polyester filament melt is realized by a system for removing the oligomer in the preparation process of the regenerated polyester filament melt, wherein the system for removing the oligomer in the preparation process of the regenerated polyester filament melt comprises a raw material bin, a boiling type pre-crystallizer, a cyclone dust separator, a hot air circulation pipeline, a crystallization fan, a crystallization heater, a feeding pipeline, a drying tower, a drying heater, a solvent adding device, a melting screw extruder, a filter, a negative pressure film drawing device, a melt inlet pipeline, a melt outlet pipeline, a negative pressure pipeline, a solvent backflow pipeline, a solvent storage tank, an oligomer collecting tank, a solvent circulation pump, a solvent circulation pipeline, a spray header and a pumping separation component,
the raw material bin is connected with a boiling type pre-crystallizer, the boiling type pre-crystallizer is connected with a cyclone dust separator, the cyclone dust separator is connected with a crystallization fan through a hot air circulation pipeline, the crystallization fan is connected with a crystallization heater, the crystallization heater is connected with the boiling type pre-crystallizer, the boiling type pre-crystallizer is connected with a drying tower through a blanking pipeline, the drying heater is connected with the drying tower, the drying tower and a solvent adding device are both connected with a feed inlet of a melting screw extruder, the melting screw extruder is connected with a filter, the filter is connected with a negative pressure film drawing device through a melt inlet pipeline, a melt outlet pipeline is connected with a negative pressure film drawing device, the negative pressure film drawing device is connected with a pumping and separating assembly through a negative pressure pipeline, and the pumping and separating assembly is connected with a solvent storage tank through a solvent return pipeline, oligomer collecting tank and solvent circulating pump all are connected with solvent storage jar, the solvent circulating pump passes through solvent circulating line with spray piping and is connected, the last shower head that installs of spray piping, the shower head is located takes out the separable set.
Further, the S1 includes the following steps:
s1a, conveying the treated bottle chips into a boiling type pre-crystallizer for pre-crystallization, heating part of oligomers to form solid particles, and removing and collecting the solid particles through a cyclone dust separator;
s1b, and drying the pre-crystallized bottle chips in a drying tower.
Further, in the S1a, the crystallization temperature is controlled to be 140-170 ℃, and the crystallization time is controlled to be 8-20 min;
in the S1b, the drying temperature is controlled to be 110-160 ℃, the drying time is controlled to be 4-6 hours, the dry air pressure is controlled to be 0.1-0.3 MPa, and finally the water content of the bottle flakes is controlled to be 30-100 ppm.
Further, in the S2, the melting screw extruder is controlled by 8 zones, and the melting control temperature is 270-310 ℃.
Further, in the S3, the ratio of the solvent to the recycled polyester bottle chips is controlled to be 1-8/1000.
Further, in the S4, the filtering precision of the filter is 25 μm.
Further, in the step S5, the negative pressure in the negative pressure film drawing device is controlled at a vacuum degree of 90-400 pa, the temperature is controlled at 260-300 ℃, the space ratio is maintained according to 5-50% of the melt liquid level, and the melt stays in the negative pressure film drawing device for 15-40 min.
Further, in S6, the suction device uses one or more sets of stacked high-speed rotor pumps to communicate with the oligomer separator through a suction pipeline to continuously apply negative pressure to the negative pressure film drawing device, and continuously pump out the generated oligomer-containing gas, so that the oligomer-containing gas enters the oligomer separator.
Further, the suction separation assembly comprises an oligomer separator, a suction device and a suction pipeline, the negative pressure film drawing device is connected with the oligomer separator through the negative pressure pipeline, the oligomer separator is connected with the solvent storage tank through the solvent return pipeline, the spray header is positioned in the oligomer separator, and the oligomer separator is connected with the suction device through the suction pipeline.
Further, the oligomer separator comprises an oligomer separator shell, an oligomer separator inner cavity, a spraying bushing and a spraying cavity, the oligomer separator inner cavity is arranged in the oligomer separator shell, the spraying bushing is arranged in the oligomer separator inner cavity, the spraying cavity is arranged between the oligomer separator shell and the spraying bushing, the negative pressure film drawing device is connected with the oligomer separator inner cavity through a negative pressure pipeline, the spraying cavity is connected with the suction device through a suction pipeline, and the spraying head is located in the spraying cavity.
Further, the negative pressure film drawing device comprises a film drawing turntable, a film drawing rotating shaft, a film drawing shell, a film drawing base and a film drawing motor, wherein the film drawing shell is installed on the film drawing base, the film drawing motor is connected with the film drawing rotating shaft, the film drawing turntable is installed on the film drawing rotating shaft, and the film drawing turntable is located in the film drawing shell.
Further, draw the membrane carousel to include first supporting ring, second supporting ring, third supporting ring, first draw the lamina membranacea, the second draws the lamina membranacea, first draw the membrane hole and the second draws the membrane hole, first supporting ring, second supporting ring and third supporting ring set gradually from inside to outside along drawing the radial of membrane carousel, first draw the lamina membranacea to install between first supporting ring and second supporting ring, and adjacent two are drawn and are provided with a first membrane hole that draws between the lamina membranacea, the second draws the lamina membranacea to install between second supporting ring and third supporting ring, and adjacent two seconds draw the lamina membranacea to be provided with a second and draw the membrane hole.
Further, the inner cavity of the oligomer separator is communicated with the spraying cavity.
Further, the number of the film drawing turntables is multiple, and the diameters of two adjacent film drawing turntables are different.
Furthermore, the melt inlet pipeline, the melt outlet pipeline and the negative pressure pipeline are all connected with the film drawing shell,
further, the first supporting ring is installed on the film drawing rotating shaft.
Furthermore, the number of the first film drawing plate, the second film drawing plate, the first film drawing holes and the second film drawing holes is multiple.
Furthermore, the shapes of the first film drawing plate, the second film drawing plate, the first film drawing hole and the second film drawing hole are all fan-shaped.
Further, the film drawing shell is obliquely arranged, an included angle between the axis of the film drawing shell and the horizontal plane is alpha, and the value range of the alpha is 10-15 degrees.
Compared with the prior art, the invention has the following advantages: the full roll rate of the improved product is improved by 10 percent, and the defective rate is reduced by 5 percent.
Adding a certain amount (0.3-6 parts per million) of solvent to crack the molecular chain of the polyester in the melting process of the raw materials; introducing the preliminarily processed melt into a high-temperature (260-300 ℃) negative-pressure film drawing device controlled according to the process requirements in a negative-pressure mode, keeping a certain space proportion (5-50%) according to the requirements, enabling the melt to move in a film sample in the negative-pressure film drawing device by the negative-pressure film drawing device, separating the melt from the film sample melt by utilizing the characteristics that a polyester material has high elasticity, high viscosity and no gas state, and an oligomer can be gasified, keeping a certain negative pressure state for the negative-pressure film drawing device according to the requirements, and separating, discharging and collecting the separated oligomer through a separating component; the suction device adopts one or more groups of superposed rotor pumps to apply negative pressure to the negative pressure film drawing device after the suction pipeline is communicated with the oligomer separator.
Drawings
Fig. 1 is a schematic structural diagram of a system for removing oligomers in a process of preparing a regenerated polyester filament melt according to an embodiment of the present invention.
FIG. 2 is a schematic front view of an oligomer separator according to an embodiment of the invention.
Fig. 3 is a schematic view of the cross-sectional structure a-a in fig. 2.
Fig. 4 is a schematic front view of a negative pressure film drawing device according to an embodiment of the present invention.
Fig. 5 is a schematic view of a sectional structure B-B in fig. 4.
Fig. 6 is a schematic perspective view of a film drawing turntable according to an embodiment of the present invention.
In the figure: a raw material bin 1, a boiling type pre-crystallizer 2, a cyclone dust separator 3, a hot air circulation pipeline 4, a crystallization fan 5, a crystallization heater 6, a blanking pipeline 7, a drying tower 8, a drying heater 9, a solvent adding device 10, a melting screw extruder 11, a filter 12, a negative pressure film drawing device 13, a melt inlet pipeline 14, a melt outlet pipeline 15, a negative pressure pipeline 16, an oligomer separator 17, a suction device 18, a solvent reflux pipeline 19, a solvent storage tank 20, an oligomer collection tank 21, a solvent circulating pump 22, a solvent circulation pipeline 23, a spray pipeline 24, a spray head 25, a suction separation assembly 26, a suction pipeline 27, an oligomer separator shell 28, an oligomer separator inner cavity 29, a spray bush 30, a spray cavity 31, a film drawing turntable 32, a film drawing rotating shaft 33, a film drawing shell 34, a film drawing base 35, a film drawing motor 36, a first support ring 37, The second support ring 38, the third support ring 39, the first film drawing plate 40, the second film drawing plate 41, the first film drawing hole 42, the second film drawing hole 43 and the exhaust port 44.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1 to 6, it should be understood that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the function and the achievable purpose of the present invention. In the present specification, the terms "upper", "lower", "left", "right", "middle" and "one" are used for clarity of description, and are not used to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
The method for removing the oligomer in the preparation process of the regenerated polyester filament melt in the embodiment comprises the following steps:
s1, drying the regenerated polyester bottle chips; s1 includes the following steps.
S1a, conveying the treated bottle flakes into a boiling type pre-crystallizer 2 for pre-crystallization, heating part of oligomers to form solid particles, and removing and collecting the solid particles through a cyclone dust separator 3; the crystallization temperature is controlled to be 140-170 ℃, and the crystallization time is controlled to be 8-20 min.
S1b, drying the pre-crystallized bottle chips in a drying tower 8, controlling the drying temperature at 110-160 ℃, the drying time at 4-6 hours, controlling the dry air pressure at 0.1-0.3 MPa, and finally controlling the water content of the bottle chips at 30-100 ppm.
S2, melting the recycled polyester bottle chips: the recycled polyester bottle flakes are extruded by a melting screw extruder 11 with the length-diameter ratio of 1:30 due to the characteristics of high viscosity, low melting point and small solid volume density, the melting screw extruder 11 is controlled by 8 regions, and the melting control temperature is 270-310 ℃.
S3, reducing the viscosity of the high-decomposition polymer chain: adding a solvent at a feed inlet of a melting screw extruder 11 through a solvent adding device 10 to ensure that the adding amount of the solvent is matched with the amount of the regenerated polyester bottle chips, and adding the solvent to depolymerize macromolecules to dilute the melt so as to ensure that oligomers easily seep out of the melt; the proportion of the solvent to the recycled polyester bottle chips is controlled to be 1-8/1000.
S4, primary filtration of the regenerated polyester melt: the melted melt is extruded from the melting screw extruder 11 to a filter 12 for primary filtration, and after the primary filtration, part of particulate matters with the filtering precision larger than that of the filter 12 are filtered out, and gasified and liquefied oligomers still remain in the melt and cannot be filtered out in a filtering way; the filtration precision of the filter 12 is 25 μm.
S5, negative-pressure film drawing: the melt after primary filtration is introduced into a high-temperature negative pressure film drawing device 13 through a melt inlet pipeline 14 in a negative pressure mode, so that the melt moves in a film-like manner in the negative pressure film drawing device 13 and the oligomer is fully exposed, and the oligomer is separated from the film-like melt by utilizing the characteristics that the high molecular substance has high elasticity, high viscosity, no gas state and can be gasified by the oligomer at high temperature and keeping the negative pressure film drawing device 13 in a negative pressure state; the negative pressure in the negative pressure film drawing device 13 is controlled at a vacuum degree of 90-400 pa, the temperature is controlled at 260-300 ℃, the space ratio is kept according to 5-50% of the melt liquid level, and the melt stays in the negative pressure film drawing device 13 for 15-40 min.
S6, suction separation: the oligomer separated from the melt enters an oligomer separator 17 through a suction device 18 in a gaseous state, and the oligomer-containing gas generates a water bath effect when passing through a plurality of groups of spray headers 25 for spraying the solvent in the oligomer separator 17, so that the oligomer is carried into a solvent storage tank 20 by the solvent; the suction device 18 uses one or more groups of superposed high-speed rotor pumps to communicate with the oligomer separator 17 through a suction pipeline 27 to continuously apply negative pressure to the negative-pressure film drawing device 13 and continuously pump out the generated oligomer-containing gas, so that the oligomer-containing gas enters the oligomer separator 17.
S7, filtering and collecting: the solvent containing oligomer is returned to the solvent storage tank 20, and is condensed, precipitated and isolated by a filter screen in the solvent storage tank 20 to remove the oligomer, the solvent from which the oligomer is removed is supplied again to a spray head 25 in the oligomer separator 17 through a solvent circulating pump 22 for recycling, and the oligomer enters an oligomer collecting tank 21 to be collected.
The method for removing the oligomer in the preparation process of the regenerated polyester filament melt in the embodiment is realized by a system for removing the oligomer in the preparation process of the regenerated polyester filament melt, and the system for removing the oligomer in the preparation process of the regenerated polyester filament melt comprises a raw material bin 1, a boiling type pre-crystallizer 2, a cyclone dust separator 3, a hot air circulation pipeline 4, a crystallization fan 5, a crystallization heater 6, a blanking pipeline 7, a drying tower 8, a drying heater 9, a solvent adding device 10, a melting screw extruder 11, a filter 12, a negative pressure film drawing device 13, a melt inlet pipeline 14, a melt outlet pipeline 15, a negative pressure pipeline 16, a solvent reflux pipeline 19, a solvent storage tank 20, an oligomer collection tank 21, a solvent circulation pump 22, a solvent circulation pipeline 23, a spray pipeline 24, a spray header 25 and a pumping separation assembly 26.
In the embodiment, a raw material bin 1 is connected with a boiling type pre-crystallizer 2, the boiling type pre-crystallizer 2 is connected with a cyclone dust separator 3, the cyclone dust separator 3 is connected with a crystallization fan 5 through a hot air circulation pipeline 4, the crystallization fan 5 is connected with a crystallization heater 6, the crystallization heater 6 is connected with the boiling type pre-crystallizer 2, the boiling type pre-crystallizer 2 is connected with a drying tower 8 through a blanking pipeline 7, the drying heater 9 is connected with the drying tower 8, the drying tower 8 and a solvent adding device 10 are both connected with a feed inlet of a melting screw extruder 11, the top of the drying tower 8 is provided with an exhaust port 44, the melting screw extruder 11 is connected with a filter 12, the filter 12 is connected with a negative pressure film drawing device 13 through a melt inlet pipeline 14, a melt outlet pipeline 15 is connected with a negative pressure film drawing device 13, the negative pressure film drawing device 13 is connected with a pumping and separating assembly 26 through a negative pressure pipeline 16, the extraction and separation assembly 26 is connected with the solvent storage tank 20 through a solvent return pipeline 19, the oligomer collecting tank 21 and the solvent circulating pump 22 are both connected with the solvent storage tank 20, the solvent circulating pump 22 is connected with the spray pipeline 24 through a solvent circulating pipeline 23, the spray pipeline 24 is provided with a spray head 25, and the spray head 25 is positioned in the extraction and separation assembly 26.
The suction separation assembly 26 in this embodiment comprises an oligomer separator 17, a suction device 18 and a suction pipeline 27, the negative pressure film drawing device 13 is connected with the oligomer separator 17 through the negative pressure pipeline 16, the oligomer separator 17 is connected with the solvent storage tank 20 through the solvent return pipeline 19, the spray header 25 is positioned in the oligomer separator 17, and the oligomer separator 17 is connected with the suction device 18 through the suction pipeline 27.
The oligomer separator 17 in this embodiment includes an oligomer separator housing 28, an oligomer separator inner cavity 29, a spray bushing 30, and a spray cavity 31, the oligomer separator inner cavity 29 is provided in the oligomer separator housing 28, the spray bushing 30 is installed in the oligomer separator inner cavity 29, and the spray cavity 31 is provided between the oligomer separator housing 28 and the spray bushing 30.
The oligomer separator inner cavity 29 in the embodiment is communicated with the spray cavity 31, the negative pressure film drawing device 13 is connected with the oligomer separator inner cavity 29 through the negative pressure pipeline 16, the spray cavity 31 is connected with the suction device 18 through the suction pipeline 27, and the spray head 25 is positioned in the spray cavity 31.
The negative pressure film drawing device 13 in this embodiment includes a film drawing turntable 32, a film drawing rotating shaft 33, a film drawing casing 34, a film drawing base 35 and a film drawing motor 36, the melt inlet pipeline 14, the melt outlet pipeline 15 and the negative pressure pipeline 16 are all connected with the film drawing casing 34, and the film drawing casing 34 is installed on the film drawing base 35.
The film drawing shell 34 in this embodiment is obliquely arranged, an included angle between an axis of the film drawing shell 34 and a horizontal plane is alpha, the value range of alpha is 10-15 degrees, the film drawing motor 36 is connected with the film drawing rotating shaft 33, the film drawing rotating discs 32 are installed on the film drawing rotating shaft 33, the number of the film drawing rotating discs 32 is multiple, the diameters of two adjacent film drawing rotating discs 32 are different, and the film drawing rotating discs 32 are located in the film drawing shell 34.
The film drawing turntable 32 in this embodiment includes a first support ring 37, a second support ring 38, a third support ring 39, a first film drawing plate 40, a second film drawing plate 41, a first film drawing hole 42, and a second film drawing hole 43, where the first support ring 37 is installed on the film drawing rotating shaft 33, and the first support ring 37, the second support ring 38, and the third support ring 39 are sequentially arranged from inside to outside along the radial direction of the film drawing turntable 32.
In this embodiment, the first film drawing plate 40 is installed between the first support ring 37 and the second support ring 38, a first film drawing hole 42 is provided between two adjacent first film drawing plates 40, the second film drawing plate 41 is installed between the second support ring 38 and the third support ring 39, a second film drawing hole 43 is provided between two adjacent second film drawing plates 41, the number of the first film drawing plate 40, the second film drawing plate 41, the first film drawing hole 42 and the second film drawing hole 43 is plural, and the shapes of the first film drawing plate 40, the second film drawing plate 41, the first film drawing hole 42 and the second film drawing hole 43 are fan-shaped.
In this embodiment, the solvent may be a solvent that is compatible with a structurally similar solvent such as ethylene glycol or butylene glycol.
Specifically, drying the recycled polyester bottle sheet → melting the recycled polyester bottle sheet → simultaneously adding 1-8/1000 solvent to reduce the viscosity of the high-decomposition polymer chain → primarily filtering the recycled polyester melt → drawing a film under negative pressure → performing suction separation → filtering and collecting. The full roll rate of the improved product is improved by 10 percent, and the defective rate is reduced by 5 percent.
Adding a certain amount (0.3-6 parts per million) of solvent to crack the molecular chain of the polyester in the melting process of the raw materials; introducing the primarily treated melt into a high-temperature (260-300 ℃) negative-pressure film drawing device 13 controlled according to the process requirements in a negative-pressure mode, keeping a certain space proportion (5-50%) according to the requirements, enabling the melt to move in a film sample in the negative-pressure film drawing device 13 by the negative-pressure film drawing device 13, separating the melt from the film sample melt by utilizing the characteristics that a polyester material has high elasticity, high viscosity and no gas state, and an oligomer can be gasified, keeping the negative-pressure film drawing device 13 in a certain negative-pressure state according to the requirements, and separating, discharging and collecting the separated oligomer through a separating component 26; the suction device 18 adopts one or more groups of superposed rotor pumps to apply negative pressure to the negative pressure film drawing device 13 after being communicated with the oligomer separator 17 through a suction pipeline 27.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A method for removing oligomers in the preparation process of a regenerated polyester filament melt is characterized by comprising the following steps: the method for removing the oligomer in the preparation process of the regenerated polyester filament yarn melt comprises the following steps:
s1, drying the regenerated polyester bottle chips;
s2, melting the recycled polyester bottle chips: the recycled polyester bottle chips have the characteristics of high viscosity, low melting point and small solid volume density, so that the recycled polyester bottle chips are extruded by a melting screw extruder (11) with the length-diameter ratio of 1:30, and the melting screw extruder (11) is controlled by multiple zones;
s3, reducing the viscosity of the high-decomposition polymer chain: adding a solvent at a feed inlet of a melting screw extruder (11) through a solvent adding device (10) to ensure that the adding amount of the solvent is matched with the amount of the regenerated polyester bottle chips, and depolymerizing a polymer by adding the solvent to dilute a melt so as to ensure that an oligomer is easy to seep out of the melt;
s4, primary filtration of the regenerated polyester melt: extruding the molten melt from the melting screw extruder (11) into a filter (12) for primary filtration, filtering out part of particulate matters which are larger than the filtration precision of the filter (12) after the primary filtration, and remaining gasified and liquefied oligomers in the melt which cannot be filtered out in a filtration mode;
s5, negative-pressure film drawing: introducing the melt after primary filtration into a high-temperature negative-pressure film drawing device (13) in a negative-pressure mode through a melt inlet pipeline (14), so that the melt forms a film sample in the negative-pressure film drawing device (13) to move and the oligomer is fully exposed, and separating the oligomer from the film sample melt by utilizing the characteristics of high elasticity, high viscosity, no gas state and capability of gasifying the oligomer of high-molecular substances at high temperature and keeping the negative-pressure film drawing device (13) in a negative-pressure state;
s6, suction separation: the oligomer separated from the melt enters an oligomer separator (17) in a gaseous state through a suction device (18), and the gas containing the oligomer generates a water bath effect when passing through a plurality of groups of spray heads (25) used for spraying the solvent in the oligomer separator (17), so that the oligomer is carried into a solvent storage tank (20) by the solvent;
s7, filtering and collecting: refluxing the solvent containing the oligomer into a solvent storage tank (20), condensing, precipitating and isolating by a filter screen in the solvent storage tank (20) to remove the oligomer, supplying the solvent from which the oligomer is removed to a spray head (25) in an oligomer separator (17) again through a solvent circulating pump (22) for recycling, and allowing the oligomer to enter an oligomer collecting tank (21) for collection;
the method for removing the oligomer in the preparation process of the regenerated polyester filament melt is realized by a system for removing the oligomer in the preparation process of the regenerated polyester filament melt, and the system for removing the oligomer in the preparation process of the regenerated polyester filament melt comprises
A raw material bin (1), a boiling type pre-crystallizer (2), a cyclone dust separator (3), a hot air circulation pipeline (4), a crystallization fan (5), a crystallization heater (6), a blanking pipeline (7), a drying tower (8), a drying heater (9), a solvent adding device (10), a melting screw extruder (11), a filter (12), a negative pressure film drawing device (13), a melt inlet pipeline (14), a melt outlet pipeline (15), a negative pressure pipeline (16), a solvent backflow pipeline (19), a solvent storage tank (20), an oligomer collection tank (21), a solvent circulation pump (22), a solvent circulation pipeline (23), a spray pipeline (24), a spray head (25) and a pumping separation component (26),
the device comprises a raw material bin (1), a boiling type pre-crystallizer (2) and a cyclone dust separator (3), wherein the cyclone dust separator (3) is connected with a crystallization fan (5) through a hot air circulation pipeline (4), the crystallization fan (5) is connected with a crystallization heater (6), the crystallization heater (6) is connected with the boiling type pre-crystallizer (2), the boiling type pre-crystallizer (2) is connected with a drying tower (8) through a blanking pipeline (7), the drying heater (9) is connected with the drying tower (8), the drying tower (8) and a solvent adding device (10) are both connected with a feed inlet of a melting screw extruder (11), the melting screw extruder (11) is connected with a filter (12), the filter (12) is connected with a negative pressure film drawing device (13) through a melt inlet pipeline (14), melt outlet pipe way (15) are drawn membrane device (13) with the negative pressure and are connected, the negative pressure is drawn membrane device (13) and is taken out separator assembly (26) and be connected through negative pressure pipeline (16), it is connected through solvent backflow pipeline (19) with solvent storage jar (20) to take out separator assembly (26), oligomer collecting tank (21) and solvent circulating pump (22) all are connected with solvent storage jar (20), solvent circulating pump (22) are connected through solvent circulating pipe (23) with spray piping (24), install shower head (25) on spray piping (24), shower head (25) are located and take out separator assembly (26).
2. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: the S1 includes the following steps:
s1a, conveying the treated bottle flakes into a boiling type pre-crystallizer (2) for pre-crystallization, heating part of oligomers to form solid particles, and removing and collecting the solid particles through a cyclone dust separator (3);
s1b, feeding the pre-crystallized bottle flakes into a drying tower (8) for drying.
3. The method for removing oligomers in a melt process for preparing recycled polyester filament yarns as claimed in claim 2, wherein: in the S1a, the crystallization temperature is controlled to be 140-170 ℃, and the crystallization time is controlled to be 8-20 min;
in the S1b, the drying temperature is controlled to be 110-160 ℃, the drying time is controlled to be 4-6 hours, the dry air pressure is controlled to be 0.1-0.3 MPa, and finally the water content of the bottle flakes is controlled to be 30-100 ppm.
4. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: in the S2, the melting screw extruder (11) is controlled by 8 zones, and the melting temperature is controlled to be 270-310 ℃.
5. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: in the S3, the ratio of the solvent to the recycled polyester bottle chips is controlled to be 1-8/1000.
6. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: in the S4, the filtering precision of the filter (12) is 25 mu m.
7. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: in the S5, the negative pressure in the negative pressure film drawing device (13) is controlled at a vacuum degree of 90-400 pa, the temperature is controlled at 260-300 ℃, the space ratio is maintained according to 5-50% of the melt liquid level, and the melt stays in the negative pressure film drawing device (13) for 15-40 min.
8. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: in the S6, the suction device (18) adopts one or more groups of superposed high-speed rotor pumps to communicate with the oligomer separator (17) through the suction pipeline (27) to continuously apply negative pressure to the negative pressure film drawing device (13), and continuously pumps out the generated oligomer-containing gas, so that the oligomer-containing gas enters the oligomer separator (17).
9. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: the extraction and separation assembly (26) comprises an oligomer separator (17), a suction device (18) and a suction pipeline (27), the negative pressure film drawing device (13) is connected with the oligomer separator (17) through a negative pressure pipeline (16), the oligomer separator (17) is connected with a solvent storage tank (20) through a solvent return pipeline (19), the spray header (25) is positioned in the oligomer separator (17), and the oligomer separator (17) is connected with the suction device (18) through the suction pipeline (27); and/or; oligomer separator (17) are including oligomer separator shell (28), oligomer separator inner chamber (29), spray bush (30) and spray cavity (31), be provided with oligomer separator inner chamber (29) in oligomer separator shell (28), spray bush (30) are installed in oligomer separator inner chamber (29), be provided with spray cavity (31) between oligomer separator shell (28) and spray bush (30), negative pressure draws membrane device (13) and oligomer separator inner chamber (29) to be connected through negative pressure pipeline (16), spray cavity (31) are connected through suction line (27) with suction device (18), shower head (25) are located spray cavity (31).
10. The method for removing oligomers in the preparation process of the regenerated polyester filament melt as claimed in claim 1, wherein: the negative-pressure film drawing device (13) comprises a film drawing turntable (32), a film drawing rotating shaft (33), a film drawing shell (34), a film drawing base (35) and a film drawing motor (36), wherein the film drawing shell (34) is installed on the film drawing base (35), the film drawing motor (36) is connected with the film drawing rotating shaft (33), the film drawing turntable (32) is installed on the film drawing rotating shaft (33), and the film drawing turntable (32) is located in the film drawing shell (34); and/or; draw membrane carousel (32) to draw membrane plate (41), first draw membrane hole (42) and second to draw membrane hole (43) including first support ring (37), second support ring (38), third support ring (39), first draw membrane plate (40), second, first support ring (37), second support ring (38) and third support ring (39) set gradually from inside to outside along drawing the radial of membrane carousel (32), first draw membrane plate (40) to install between first support ring (37) and second support ring (38), adjacent two are first to be provided with one between drawing membrane plate (40) and first draw membrane hole (42), the second draws membrane plate (41) to install between second support ring (38) and third support ring (39), and two adjacent seconds draw membrane plate (41) to be provided with one second and draw membrane hole (43).
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