CN108103613B - Polyester material recovery and surface mechanical etching method - Google Patents
Polyester material recovery and surface mechanical etching method Download PDFInfo
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- CN108103613B CN108103613B CN201711394664.0A CN201711394664A CN108103613B CN 108103613 B CN108103613 B CN 108103613B CN 201711394664 A CN201711394664 A CN 201711394664A CN 108103613 B CN108103613 B CN 108103613B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J3/00—Modifying the surface
- D02J3/02—Modifying the surface by abrading, scraping, scuffing, cutting, or nicking
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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)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention relates to the technical field of polymer processing, and provides a polyester material recovery and surface mechanical etching method, which comprises the following steps: alcoholysis: putting the recycled polyester material and EG into an alcoholysis kettle for alcoholysis, wherein the weight ratio of the polyester material to the EG is 1: 1.0-2.0; impurity removal: filtering the alcoholysis product with a filter; exchange reaction: adding methanol into the filtered alcoholysis product to perform transesterification reaction to obtain a transesterification product; extracting DM; spinning: preparing the pure DMT into graphene/polyester fibers by a composite spinning process; mechanical etching: fine holes are etched on the surface of the prepared graphene/polyester fiber. The method can reduce the recovery energy consumption of the polyester, can expose more functional components on the surface of the graphene/polyester fiber, and is beneficial to the functional components in the graphene/polyester fiber to exert the performance of the graphene/polyester fiber.
Description
Technical Field
The invention relates to the technical field of polymer processing, in particular to a polyester material recycling and surface mechanical etching method.
Background
Polyester (polyethylene terephthalate, PET) is a synthetic fiber material with the largest yield, and is widely applied to products such as fibers, textile fabrics, clothes, polyester bottles, films, sheets and the like. Based on the requirements of environmental awareness enhancement, resource saving and sustainability, how to treat leftover materials generated in the manufacturing of polyester products and waste after the use of the polyester products becomes a problem to be solved urgently, and the waste polyester is recycled and utilized to become a green textile development direction.
The existing recovery method of waste polyester mainly comprises physical recovery and chemical recovery. The physical recovery method is simpler and more economical, but the performance of the regenerated product is poor. One important direction of chemical recovery is to alcoholyze the waste polyester with Ethylene Glycol (EG) to produce dihydroxy terephthalate (BHET) or oligomers, then perform transesterification in methanol to produce dimethyl terephthalate (DMT) and ethylene glycol, obtain pure DMT by purification, and use the pure DMT as raw material for polyester production, and use the purified methanol and ethylene glycol in the reaction system to realize the recycling of the waste polyester.
U.S. Pat. No. 5, 6706843, 1 discloses a process for recovering waste polyester and preparing DMT, which comprises alcoholysis of waste polyester with 0.5-20 times of EG by weight of waste polyester in the presence of catalyst at 190 ℃ and 175-. And carrying out ester exchange reaction on the concentrated alcoholysis product and methanol to generate DMT, and rectifying and purifying to prepare pure DMT.
Chinese patent application No. TW095128537 'method for recovering useful components from dyed polyester fiber' provides a method for recovering DMT from waste polyester fiber, according to which EG 4-10 times by weight of waste polyester is alcoholyzed at 140 ℃ and 190 ℃ in the presence of a catalyst, and then the alcoholysis product is distilled and concentrated to evaporate EG so that the weight ratio of EG to waste polyester in the concentrated alcoholysis product is 0.5-2. And carrying out ester exchange reaction on the concentrated alcoholysis product and methanol to generate DMT, and rectifying and purifying to prepare pure DMT.
In the prior art, the amount of EG used for alcoholysis is large in the process of preparing DMT from waste polyester, ester exchange reaction is well carried out after alcoholysis, a distillation and concentration process is needed, energy consumption is increased, and concentration equipment is needed.
The recycled polyester has the characteristics of small molecular weight and mechanical property which is not similar to that of the common polyester, so that the application range of the recycled polyester is restricted, and how to improve the physical properties of the recycled polyester or the spinning products thereof becomes a problem to be solved in the field.
Disclosure of Invention
Therefore, a method for recycling waste polyester materials is needed to be provided, and the problems that the waste polyester materials in the prior art are high in recycling energy consumption and the physical properties of the prepared fibers are poor are solved.
In order to achieve the above object, the inventor provides a method for recycling polyester material and mechanically etching surface, comprising the following steps:
alcoholysis: putting the recycled polyester material and EG into an alcoholysis kettle for alcoholysis to obtain an alcoholysis product, wherein the temperature of alcoholysis is 180-200 ℃, and the weight ratio of the polyester material to EG is 1: 1.0-2.0;
impurity removal: filtering the alcoholysis product by using a filter at the temperature of 130-180 ℃ to remove solid impurities in the alcoholysis product;
exchange reaction: adding methanol into the filtered alcoholysis product, and carrying out ester exchange reaction under the action of a catalyst to obtain an ester exchange product, wherein the temperature of the ester exchange reaction is 60-80 ℃, and the reaction time is 1-3 h;
crude extraction: cooling the ester exchange product to separate out DMT crystal, and filtering to obtain DMT filter cake;
fine extraction: rectifying and purifying the DMT filter cake to obtain pure DMT;
spinning: preparing the pure DMT into graphene/polyester fibers by a composite spinning process;
mechanical etching: and drawing the graphene/polyester fiber to pass through a mechanical etching device, wherein fine hooks are densely distributed on the surface of the mechanical etching device, and the fine hooks penetrate into and scratch the surface of the graphene/polyester fiber to form uniformly distributed fine holes on the surface of the graphene/polyester fiber.
Further, the mechanical etching device comprises a pair of conveying rollers, a graphene/polyester fiber passing channel is arranged between the conveying rollers, and the surface of at least one conveying roller is provided with the fine hooks.
Furthermore, mechanical etching device includes a roller, the surface of roller is provided with thin hook.
Furthermore, the mechanical etching device comprises a panel and an air injection pressurizing device, wherein the fine hook is arranged on the surface of the panel, and the air injection pressurizing device is arranged opposite to the panel and is used for blowing the graphene/polyester fibers to the panel.
Further, the preparation of the graphene/polyester fiber by the composite spinning process in step spinning comprises the following steps:
preparing graphene master batches, wherein the weight ratio of graphene to DMT is 0.01% -30%;
melting the graphene master batch and the pure DMT slices to prepare a spinning melt;
extruding the spinning melt through a spinneret orifice to form a melt trickle;
cooling and solidifying the melt trickle to form nascent fiber;
and winding the primary fiber to form the graphene/polyester fiber.
Further, in the alcoholysis step, the weight ratio of the recycled polyester material to EG is 1:1.0-1.5, and potassium carbonate and zinc acetate are used for catalysis in the alcoholysis process.
Further, the catalyst used in the alcoholysis process is present in an amount of from 0.3 to 3.0% by weight of the polyester material.
Further, the impurity removing step further comprises: washing the solid impurities obtained by filtering with EG, and refluxing the washed EG to the alcoholysis kettle for recycling.
Further, the catalyst used in the step exchange reaction is sodium hydroxide or potassium carbonate, and the amount of the catalyst is 0.2-5.0% of the weight of the recycled polyester material.
Compared with the prior art, the technical scheme has the advantages that by optimizing the use amount of EG in the alcoholysis process, after alcoholysis is finished, a distillation and concentration step is not needed, and alcoholysis products directly perform ester exchange reaction with methanol to produce pure DMT products, so that the energy consumption for polyester recovery is reduced; and a plurality of prismatic and fine gaps can be formed on the surface of the fiber through mechanical etching, so that more functional components are exposed on the surface of the graphene/polyester fiber, and the functional components in the graphene/polyester fiber can exert the performance of the graphene/polyester fiber.
Drawings
FIG. 1 shows an apparatus for composite spinning and mechanical etching according to an embodiment.
Fig. 2 is a schematic structural view of the scraping disc according to the embodiment.
Description of reference numerals:
1. a melt spinning machine; 11. a screw extruder; 12. a spinning box; 13. a spinneret;
14. a corridor; 15. composite fibers; 16. a heat removal device; 17. loading onto a tanker;
111. a hopper; 18. a winding drum; 19. a traction roller;
2. an etching device; 21. a scraper disc 22, a scraper; 23. a platen;
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Noun interpretation
DMT: dimethyl phthalate;
EG: ethylene glycol;
example one
A polyester material recovery and surface mechanical etching method comprises the following steps:
alcoholysis: 100g waste polyester, 180gEG g potassium carbonate and 2.7g potassium carbonate are put into an alcoholysis kettle, air is replaced by nitrogen, the temperature is raised to 200 ℃ by heating, and alcoholysis is carried out for 3.0 h.
Impurity removal: and cooling the alcoholysis product to 170 ℃, and filtering by using a 100-mesh filter to remove solid impurities. The solid impurities are washed by hot EG90g at 170 ℃, and the washed EG is returned to the alcoholysis kettle for alcoholysis of the next batch of waste polyester.
Exchange reaction: adding methanol 180g and potassium carbonate 2.7g into the alcoholysis product, maintaining the temperature at 75 deg.C, and reacting for 1.0 hr.
Crude extraction: the temperature of the ester exchange product is reduced to 40 ℃, and DMT is crystallized and separated out. Crude DMT filter cake was obtained by vacuum filtration and washed with methanol to obtain DMT filter cake.
Fine extraction: the DMT filter cake is purified by a short-flow rectification system under the vacuum of 6.65Kpa and the temperature of 200 ℃ to obtain the pure DMT with the purity of 77g and the purity of 95.3 percent.
In various examples, the above polyester material recovery procedure was repeated with modifications to the weight ratio of EG to polyester, and the data obtained are shown in the following table:
by optimizing the consumption of EG in the alcoholysis process, a distillation and concentration step is not needed after alcoholysis is finished, and alcoholysis products directly perform ester exchange reaction with methanol to produce pure DMT products.
Spinning: and preparing the graphene/polyester fiber from the pure DMT through a composite spinning process.
The preparation of the graphene/polyester fiber by the composite spinning process comprises the following steps:
preparing graphene master batches, wherein the weight ratio of graphene to recycled polyester (pure DMT) in graphene is 0.01% -30%; and a second step of producing graphene/polyester fibers by melt spinning, wherein the melt spinning comprises the following steps:
preparing a spinning melt, and melting the graphene master batch and the pure DMT slices to prepare the spinning melt;
extruding the melt through a spinneret orifice to form melt trickle;
thirdly, the melt trickle is cooled and solidified to form nascent fiber;
and fourthly, oiling and winding the nascent fiber to form the graphene/polyester fiber.
Preferably, some chain extenders, such as epoxy resin, can be added to the spinning solution to improve the molecular weight and the mechanical properties of spinning.
The prepared fiber has high strength, and through test and research, the fiber has multiple functions of high flame retardance, permanent antibacterial property, antistatic property and the like, and can be applied to the field of textile fabrics requiring high strength and functionality.
Mechanical etching: and drawing the graphene/polyester fiber to pass through a mechanical etching device, wherein fine hooks are densely distributed on the surface of the mechanical etching device, and the fine hooks penetrate into and scratch the surface of the graphene/polyester fiber to form uniformly distributed fine holes on the surface of the graphene/polyester fiber.
As shown in fig. 1, the equipment used for the combined spinning process and mechanical rice-carving is shown.
The equipment comprises a melt spinning machine and a mechanical etching machine, wherein the melt spinning machine comprises a screw extruder 11, a spinning box 12, a spinning nozzle 13, a channel 14, a heat discharger 16, an upper oil wheel 17, a traction roller 19 and a winding drum 18.
The spinning head 13 is connected to the discharge end of the screw extruder 11, the discharge end of the screw extruder 11 is connected with the spinning box 12, the spinning box 12 is used for temporarily storing the molten raw material, the spinning box 12 is connected with the spinning head 13 through a metering pump, more than two spinning holes are formed in the spinning head 13, one end of the channel 14 is opposite to the spinning head 13, and the traction roller 19 is arranged at the other end of the channel. The side wall of the shaft is connected with a heat removal device 16 which is communicated with the outside through a pipeline, and a heat exchanger and an exhaust fan are arranged in the heat removal device.
The screw extruder 11 is provided with a hopper 111 for storing spinning raw materials, and the raw materials are mixed master batches mixed with graphene functional components and chemical fiber components such as polyester and the like when the composite fiber is produced. The raw material is heated to form a molten state after entering a screw extruder 11, and then is extruded into a spinning box 12 arranged at the tail end of the extruder and is sent to a spinning nozzle 13 through a metering pump, and the spinning nozzle 13 is provided with more than two spinning holes and sends the molten raw material to the spinning nozzle. The molten raw material is sprayed out of the spinning nozzle 13 to form a melt stream, the melt stream enters the channel 14 to be cooled and solidified and is pulled out from the other end of the channel by a pulling roll 19, an oiling wheel 17 is arranged in front of the pulling roll 19, and an oiling channel for allowing the filaments sprayed out of each spinning hole to pass through is arranged in the middle of the oiling wheel 17. The fine flow ejected from the spinneret orifices is twisted into composite fibers 15 through the oiling channel.
And adding a mechanical etching device at the back end of the spinning and before winding, and as shown in FIG. 2, the mechanical etching device is a structural schematic diagram. The mechanical etching device comprises a scraping disc 21 and a pressing disc 23, the scraping disc 21 and the pressing disc 23 are arranged oppositely, a channel for allowing graphene/polyester fibers to pass through is arranged between the scraping disc 21 and the pressing disc 23, a plurality of thin fine hooks 22 with sharp top ends are distributed on the surface of the scraping disc 21, and the top ends of the fine hooks 22 extend into the channel. The pressing disc 23 is used for pressing the graphene/polyester fibers to the scraping disc so that the graphene/polyester fibers are fully contacted with the surface of the scraping disc 21. When graphite alkene/dacron fibre pass through the frizing with certain angle, the fibre surface can receive piercing and the scratch of thin hook 22, and the size through control angle makes the sharp sword go deep into fibrous degree of depth, and makes the fibrous surface form many arriss types and tiny gaps, and graphite alkene among the graphite alkene/dacron fibre will have more areas to expose in the environment, and promotes the functional of graphite alkene/dacron. Meanwhile, due to the fact that the surface of the fiber is deformed, more gaps and concave-convex exist, capillary benefits are easily formed, and the moisture absorption and sweat releasing performance of the graphene/polyester fiber is improved. The fabric prepared from the graphene/polyester fiber has a hemp hand feeling due to the protrusions and roughness on the surface of the fiber. In order to facilitate the winding of the etched composite fibers, a winding drum 18 is arranged behind the etching device 2, and the winding drum 18 is driven by a motor to wind the composite fibers into bundles.
The mechanical etching step can also be realized by adopting the following scheme:
at the spinning rear end, before the coiling, install two rough-surfaced rollers additional, rough-surfaced roller is because there are very many superfine thin hooks, can control protruding deep that pierces fibre inside through the pressure of roller pressurization, when graphite alkene/dacron pass through this is protruding with certain speed, the surface can receive the most advanced pricking and the scratch of thin hook, and make fibre surface form many arriss type and tiny space, graphite alkene among the graphite alkene/dacron fibre will have more areas to expose in the environment, and promote the functional of graphite alkene/dacron.
At the spinning rear end, before the coiling, install a dull and stereotyped and the jet-propelled pressure device of surperficial roughness additional, dull and stereotyped and jet-propelled pressure device set up relatively, the dull and stereotyped of rough surface is because there are very many superfine thin hooks, when graphite alkene/dacron fibre passes through this dull and stereotyped of surperficial roughness with certain speed, the surface can receive most advanced puncture and scratch, the protruding degree of depth of penetrating the fibre inside of power of jet-propelled can be controlled, and make fibre surface form many arriss type and tiny space, graphite alkene among the graphite alkene/dacron fibre will have more areas to expose in the environment, and promote the functional of graphite alkene/dacron.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (8)
1. A polyester material recovery and surface mechanical etching method is characterized by comprising the following steps:
alcoholysis: putting the recycled polyester material and EG into an alcoholysis kettle for alcoholysis to obtain an alcoholysis product, wherein the temperature of alcoholysis is 180-200 ℃, the weight ratio of the polyester material to EG is 1:1.0-2.0, and a distillation and concentration step is not needed after alcoholysis is finished;
impurity removal: filtering the alcoholysis product by using a filter at the temperature of 130-180 ℃ to remove solid impurities in the alcoholysis product;
exchange reaction: adding methanol into the filtered alcoholysis product, and carrying out ester exchange reaction under the action of a catalyst to obtain an ester exchange product, wherein the temperature of the ester exchange reaction is 60-80 ℃, and the reaction time is 1-3 h;
crude extraction: cooling the ester exchange product to separate out DMT crystal, and filtering to obtain DMT filter cake;
fine extraction: rectifying and purifying the DMT filter cake to obtain pure DMT;
spinning: preparing the pure DMT into graphene/polyester fibers by a composite spinning process;
mechanical etching: draw graphite alkene polyester fiber is through mechanical etching device, and mechanical etching device's surface gathers there is thin hook, mechanical etching device includes a pair of pressure disk and scraping disc, has graphite alkene polyester fiber between pressure disk and the scraping disc and passes through the passageway, and the scraping disc surface is provided with thin hook, through thin hook pierces and scratches graphite alkene polyester fiber's surface forms evenly distributed's micropore on graphite alkene polyester fiber surface, and graphite alkene among the graphite alkene polyester fiber exposes in the environment more.
2. The method for recycling the polyester material and mechanically etching the surface of the polyester material as claimed in claim 1, wherein the mechanical etching device comprises a roller, and the fine hook is arranged on the surface of the roller.
3. The method for recycling the polyester material and mechanically etching the surface of the polyester material as claimed in claim 1, wherein the mechanical etching device comprises a panel and an air-jet pressurizing device, the fine hook is arranged on the surface of the panel, and the air-jet pressurizing device is arranged opposite to the panel and is used for blowing the graphene/polyester fiber to the panel.
4. The method for recycling the polyester material and mechanically etching the surface of the polyester material as claimed in claim 1, wherein the step of preparing the graphene/polyester fiber by the composite spinning process in the step of spinning comprises the following steps:
preparing graphene master batches, wherein the weight ratio of graphene to DMT is 0.01% -30%;
melting the graphene master batch and the pure DMT slices to prepare a spinning melt;
extruding the spinning melt through a spinneret orifice to form a melt trickle;
cooling and solidifying the melt trickle to form nascent fiber;
and winding the primary fiber to form the graphene/polyester fiber.
5. The method for recycling the polyester material and mechanically etching the surface of the polyester material as claimed in claim 1, wherein in the alcoholysis step, the weight ratio of the recycled polyester material to EG is 1:1.0-1.5, and potassium carbonate and zinc acetate are used for catalysis in the alcoholysis process.
6. The method for recycling polyester materials and mechanically etching surfaces of claim 1, wherein the weight of the catalyst used in the alcoholysis process is 0.3-3.0% of the weight of the polyester materials.
7. The method for recycling polyester materials and mechanically etching surfaces as claimed in claim 1, further comprising the steps of: washing the solid impurities obtained by filtering with EG, and refluxing the washed EG to the alcoholysis kettle for recycling.
8. The method for recycling polyester materials and mechanically etching surfaces as claimed in claim 1, wherein the catalyst used in the step exchange reaction is sodium hydroxide or potassium carbonate, and the amount of the catalyst is 0.2-5.0% by weight of the recycled polyester materials.
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| CN112225661B (en) * | 2020-10-16 | 2022-11-18 | 艾凡佳德(上海)环保科技有限公司 | Impurity removal method and equipment for alcoholysis product after continuous alcoholysis of waste polyester |
| CN112376128A (en) * | 2020-11-13 | 2021-02-19 | 扬州天富龙汽车内饰纤维有限公司 | Process and equipment for producing colored polyester staple fibers by chemically degrading waste polyester |
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| KR0146571B1 (en) * | 1995-12-28 | 1998-08-01 | 김준웅 | Method of manufacturing polyeterester |
| CN1413178A (en) * | 1999-10-22 | 2003-04-23 | 帝人株式会社 | Method for separating and recovering dimethyl terephthalate and ethylene glycol from polyester waste |
| CN101238171A (en) * | 2005-08-05 | 2008-08-06 | 帝人纤维株式会社 | Method for recovery of valuable ingredient from dyed polyester fiber |
| CN103012758A (en) * | 2012-12-04 | 2013-04-03 | 肇庆天富新合纤有限公司 | Recovery processing method of PET (Polyethylene Terephthalate) polyester and high-strength and high-flexibility polyester fiber |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0146571B1 (en) * | 1995-12-28 | 1998-08-01 | 김준웅 | Method of manufacturing polyeterester |
| CN1413178A (en) * | 1999-10-22 | 2003-04-23 | 帝人株式会社 | Method for separating and recovering dimethyl terephthalate and ethylene glycol from polyester waste |
| CN101238171A (en) * | 2005-08-05 | 2008-08-06 | 帝人纤维株式会社 | Method for recovery of valuable ingredient from dyed polyester fiber |
| CN103012758A (en) * | 2012-12-04 | 2013-04-03 | 肇庆天富新合纤有限公司 | Recovery processing method of PET (Polyethylene Terephthalate) polyester and high-strength and high-flexibility polyester fiber |
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