CN110126136B - Tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes - Google Patents
Tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes Download PDFInfo
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- CN110126136B CN110126136B CN201910419372.0A CN201910419372A CN110126136B CN 110126136 B CN110126136 B CN 110126136B CN 201910419372 A CN201910419372 A CN 201910419372A CN 110126136 B CN110126136 B CN 110126136B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
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- B29B17/04—Disintegrating plastics, e.g. by milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
- B29B2017/0015—Washing, rinsing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes, which relates to the technical field of processing of regenerated polyester yarns and comprises the following steps: (1) crushing, (2) cleaning, (3) drying, (4) tackifying, and (5) outputting by a die head. The brittleness of the waste polyester bottle flakes is improved through freezing treatment, so that the crushing efficiency is improved and the energy consumption of a crusher is reduced on the basis of ensuring the crushing granularity; the mode of crushing firstly and then cleaning is adopted, so that the cleaning efficiency can be obviously improved, and the cleaned dust and oil stain are easier to enter the cleaning wastewater; and the intrinsic viscosity of the treated PET melt is obviously increased through tackifying the waste polyester, so that the requirements of the high-modulus low-shrinkage polyester yarn on the raw materials are met.
Description
The technical field is as follows:
the invention relates to the technical field of processing of regenerated polyester yarns, in particular to a tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle chips.
Background art:
the production of regenerated fibers by using waste polyester bottle chips is a main way for recycling and reusing polyester in China at present, however, the fibers are mainly cotton type and filling type products at low ends, and regenerated fiber enterprises are in a state of slight benefit due to the expansion of capacity and serious homogenization. Therefore, it is necessary to improve the end-point and functionality of the regenerated fiber.
The intrinsic viscosity (about 0.6dL/g) of the common PET chips cannot meet the requirements of high-modulus low-shrinkage polyester yarns on raw materials, and the intrinsic viscosity of PET melt recovered by the PET bottle chips is lower. Therefore, in order to increase the intrinsic viscosity of the PET melt, it is necessary to subject the recovered PET to thickening treatment. The commonly adopted tackifying mode at present is PET chain extension tackifying, but the tackifying effect of the tackifying mode is limited, and the added tackifying agent is ensured not to generate decomposition reaction in the high-temperature extrusion molding process, otherwise, the recycling performance of the recycled PET is influenced.
The invention content is as follows:
the invention aims to solve the technical problem of providing a tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle chips, which is simple and easy to operate, clear in process control parameters and good in process repeatability.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the tackifying process for processing the high-modulus low-shrinkage polyester yarns by utilizing the recycled polyester bottle chips comprises the following steps of:
(1) crushing: firstly, transferring the waste polyester bottle flakes into a freezing chamber for standing, carrying out freezing treatment, then transferring out, and preparing into particles with the particle size of 1-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: sending the obtained waste polyester particles into a drum-type cleaning machine, spraying cleaning liquid in the drum-type cleaning machine, cleaning at the rotating speed of 300-500 rpm, discharging the cleaning liquid after cleaning, and then discharging the waste polyester particles;
(3) drying: feeding the cleaned polyester particles into a roller dryer, and drying at the rotating speed of 200-400 rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 250-260 ℃;
(5) die head output: and (3) feeding the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the runner temperature is 250-260 ℃, and the die head temperature is 260-270 ℃.
The freezing temperature in the step (1) is 5-10 ℃.
The freezing treatment time in the step (1) is 8-12 h.
And (3) the temperature of the cleaning liquid in the step (2) is 45-55 ℃.
And (3) the cleaning time in the step (2) is 10-30 min.
And (4) drying at 65-75 ℃ in the step (3).
The weight ratio of the polyester particles to the tackifier in the step (4) is 100: 5-15.
The tackifier in the step (4) is pyromellitic dianhydride. In the extrusion plasticizing process, pyromellitic dianhydride carries out chain extension and tackifying on PET, belonging to a chemical tackifying mode.
The tackifier in the step (4) consists of trimethylolpropane triglycidyl ether, poly dipentaerythritol hexaacrylate and stearyl glycyrrhetinate in a weight ratio of 2:1: 0.5. The tackifier interpenetrates into a PET molecular structure in the extrusion plasticizing process, and belongs to a physical tackifying mode.
And (3) the cleaning liquid in the step (2) is prepared by dissolving a cleaning agent in water.
The cleaning agent is decyl glucoside, and the using amount of the decyl glucoside is 0.5-5 g of water dissolved in 1kg of water.
The cleaning agent is decyl glucoside-pyroglutamic acid esterified substance, and the dosage of the decyl glucoside-pyroglutamic acid esterified substance is 0.5-5 g per 1kg of water.
The decyl glucoside-pyroglutamic acid esterified substance is prepared by carrying out esterification reaction on decyl glucoside and pyroglutamic acid, and the preparation method comprises the following steps: firstly, respectively dissolving decyl glucoside and pyroglutamic acid in water to prepare a decyl glucoside solution and a pyroglutamic acid solution, then dropwise adding concentrated sulfuric acid into the pyroglutamic acid solution to adjust the pH value of the solution to 3-4, then dropwise adding the decyl glucoside solution, heating to a reflux state after the dropwise adding is finished, carrying out heat preservation reaction, carrying out reduced pressure concentration after the reaction is finished to prepare a paste body with the solid content of 65-75%, naturally cooling the obtained paste body to room temperature, then sending the paste body into a freeze dryer, drying the obtained solid, and preparing the solid into micropowder with the particle size of 15-20 mu m through an ultrafine pulverizer to obtain the decyl glucoside-pyroglutamic acid esterified substance.
The molar ratio of decyl glucoside to pyroglutamic acid is 1: 5.
The invention has the beneficial effects that:
(1) the brittleness of the waste polyester bottle flakes is improved through freezing treatment, so that the crushing efficiency is improved and the energy consumption of a crusher is reduced on the basis of ensuring the crushing granularity; the mode of crushing firstly and then cleaning is adopted, so that the cleaning efficiency can be obviously improved, and the cleaned dust and oil stain can easily enter the cleaning wastewater;
(2) according to the invention, the dust and oil stains attached to the waste polyester particles are efficiently removed through cleaning operation, the influence of the dust and oil stains on the regeneration of the waste polyester particles is avoided, and the treatment difficulty of the waste water generated by cleaning is reduced by selecting the environment-friendly cleaning agent;
(3) according to the invention, waste polyester is tackified by two tackification modes, so that the intrinsic viscosity of the treated PET melt is obviously increased, and the requirements of high-modulus low-shrinkage polyester yarns on raw materials are met.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
(1) Crushing: firstly, transferring 25kg of waste polyester bottle chips into a freezing chamber at the temperature of 5-10 ℃, standing, carrying out freezing treatment for 12 hours, transferring out, and preparing into particles with the particle size of 3-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: feeding the obtained waste polyester particles into a drum-type cleaning machine, spraying 100kg of cleaning solution at 50-55 ℃ in the drum-type cleaning machine, cleaning for 10min at the rotating speed of 500rpm, discharging the cleaning solution after cleaning, and then discharging the waste polyester particles; the cleaning solution is prepared by dissolving a cleaning agent in water, wherein the cleaning agent is decyl glucoside, and the dosage of the decyl glucoside is 5g per 1kg of water;
(3) drying: feeding the cleaned polyester particles into a 70-75 ℃ roller dryer, and drying at a rotating speed of 300rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 255-260 ℃; the weight ratio of the polyester particles to the tackifier pyromellitic dianhydride is 100: 10;
(5) die head output: and (3) conveying the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the temperature of the runner is 250-255 ℃, and the temperature of the die head is 260-265 ℃.
Example 2
(1) Crushing: firstly, transferring 25kg of waste polyester bottle chips into a freezing chamber at the temperature of 5-10 ℃, standing, carrying out freezing treatment for 12 hours, transferring out, and preparing into particles with the particle size of 3-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: feeding the obtained waste polyester particles into a drum-type cleaning machine, spraying 100kg of cleaning solution at 50-55 ℃ in the drum-type cleaning machine, cleaning for 10min at the rotating speed of 500rpm, discharging the cleaning solution after cleaning, and then discharging the waste polyester particles; the cleaning solution is prepared by dissolving a cleaning agent in water, wherein the cleaning agent is decyl glucoside, and the dosage of the decyl glucoside is 5g per 1kg of water;
(3) drying: feeding the cleaned polyester particles into a 70-75 ℃ roller dryer, and drying at a rotating speed of 300rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 255-260 ℃; the weight ratio of the polyester particles to the tackifier is 100:10, and the tackifier consists of trimethylolpropane triglycidyl ether, poly dipentaerythritol hexaacrylate and stearyl glycyrrhetinate in a weight ratio of 2:1: 0.5;
(5) die head output: and (3) conveying the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the temperature of the runner is 250-255 ℃, and the temperature of the die head is 260-265 ℃.
Example 3
(1) Crushing: firstly, transferring 25kg of waste polyester bottle chips into a freezing chamber at the temperature of 5-10 ℃, standing, carrying out freezing treatment for 12 hours, transferring out, and preparing into particles with the particle size of 3-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: feeding the obtained waste polyester particles into a drum-type cleaning machine, spraying 100kg of cleaning solution at 50-55 ℃ in the drum-type cleaning machine, cleaning for 10min at the rotating speed of 500rpm, discharging the cleaning solution after cleaning, and then discharging the waste polyester particles; the cleaning solution is prepared by dissolving a cleaning agent in water, wherein the cleaning agent is decyl glucoside-pyroglutamic acid esterified substance, and the dosage of the cleaning agent is 5g of decyl glucoside-pyroglutamic acid esterified substance dissolved in 1kg of water;
preparation of decyl glucoside-pyroglutamic acid esterified ester: firstly, respectively dissolving 1mol of decyl glucoside and 5mol of pyroglutamic acid in water to prepare a decyl glucoside solution and a pyroglutamic acid solution, then dropwise adding concentrated sulfuric acid into the pyroglutamic acid solution to adjust the pH value of the solution to 3-4, then dropwise adding the decyl glucoside solution, heating to a reflux state after the dropwise adding is finished, carrying out heat preservation reaction, carrying out reduced pressure concentration after the reaction is finished to prepare a paste body with the solid content of 65-75%, naturally cooling the obtained paste body to the room temperature, then sending the paste body into a freeze dryer, and drying the obtained solid to prepare micropowder with the particle size of 15-20 mu m through an ultrafine pulverizer to obtain decyl glucoside-pyroglutamic acid esterified substance;
(3) drying: feeding the cleaned polyester particles into a 70-75 ℃ roller dryer, and drying at a rotating speed of 300rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 255-260 ℃; the weight ratio of the polyester particles to the tackifier is 100:10, and the tackifier consists of trimethylolpropane triglycidyl ether, poly dipentaerythritol hexaacrylate and stearyl glycyrrhetinate in a weight ratio of 2:1: 0.5;
(5) die head output: and (3) conveying the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the temperature of the runner is 250-255 ℃, and the temperature of the die head is 260-265 ℃.
Comparative example 1
Comparative example 1 in which stearyl glycyrrhetinate was not added to the thickener was prepared by comparing example 2.
(1) Crushing: firstly, transferring 25kg of waste polyester bottle chips into a freezing chamber at the temperature of 5-10 ℃, standing, carrying out freezing treatment for 12 hours, transferring out, and preparing into particles with the particle size of 3-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: feeding the obtained waste polyester particles into a drum-type cleaning machine, spraying 100kg of cleaning solution at 50-55 ℃ in the drum-type cleaning machine, cleaning for 10min at the rotating speed of 500rpm, discharging the cleaning solution after cleaning, and then discharging the waste polyester particles; the cleaning solution is prepared by dissolving a cleaning agent in water, wherein the cleaning agent is decyl glucoside, and the dosage of the decyl glucoside is 5g per 1kg of water;
(3) drying: feeding the cleaned polyester particles into a 70-75 ℃ roller dryer, and drying at a rotating speed of 300rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 255-260 ℃; the weight ratio of the polyester particles to the tackifier is 100:10, and the tackifier consists of trimethylolpropane triglycidyl ether and poly dipentaerythritol hexaacrylate in a weight ratio of 2: 1;
(5) die head output: and (3) conveying the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the temperature of the runner is 250-255 ℃, and the temperature of the die head is 260-265 ℃.
Comparative example 2
Comparative example 2, in which no dipentaerythritol hexaacrylate was added to the tackifier, was set as a control to example 2.
(1) Crushing: firstly, transferring 25kg of waste polyester bottle chips into a freezing chamber at the temperature of 5-10 ℃, standing, carrying out freezing treatment for 12 hours, transferring out, and preparing into particles with the particle size of 3-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: feeding the obtained waste polyester particles into a drum-type cleaning machine, spraying 100kg of cleaning solution at 50-55 ℃ in the drum-type cleaning machine, cleaning for 10min at the rotating speed of 500rpm, discharging the cleaning solution after cleaning, and then discharging the waste polyester particles; the cleaning solution is prepared by dissolving a cleaning agent in water, wherein the cleaning agent is decyl glucoside, and the dosage of the decyl glucoside is 5g per 1kg of water;
(3) drying: feeding the cleaned polyester particles into a 70-75 ℃ roller dryer, and drying at a rotating speed of 300rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 255-260 ℃; the weight ratio of the polyester particles to the tackifier is 100:10, and the tackifier consists of trimethylolpropane triglycidyl ether and stearyl glycyrrhetinate in a weight ratio of 2: 0.5;
(5) die head output: and (3) conveying the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the temperature of the runner is 250-255 ℃, and the temperature of the die head is 260-265 ℃.
Comparative example 3
Comparative example 3 in which trimethylolpropane triglycidyl ether was not added to the tackifier was prepared by referring to example 2.
(1) Crushing: firstly, transferring 25kg of waste polyester bottle chips into a freezing chamber at the temperature of 5-10 ℃, standing, carrying out freezing treatment for 12 hours, transferring out, and preparing into particles with the particle size of 3-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: feeding the obtained waste polyester particles into a drum-type cleaning machine, spraying 100kg of cleaning solution at 50-55 ℃ in the drum-type cleaning machine, cleaning for 10min at the rotating speed of 500rpm, discharging the cleaning solution after cleaning, and then discharging the waste polyester particles; the cleaning solution is prepared by dissolving a cleaning agent in water, wherein the cleaning agent is decyl glucoside, and the dosage of the decyl glucoside is 5g per 1kg of water;
(3) drying: feeding the cleaned polyester particles into a 70-75 ℃ roller dryer, and drying at a rotating speed of 300rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 255-260 ℃; the weight ratio of the polyester particles to the tackifier is 100:10, and the tackifier consists of poly dipentaerythritol hexaacrylate and stearyl glycyrrhetinate in the weight ratio of 1: 0.5;
(5) die head output: and (3) conveying the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the temperature of the runner is 250-255 ℃, and the temperature of the die head is 260-265 ℃.
Comparative example 4
Using example 3 as a control, a control 4 in which a mixture of decyl glucoside and pyroglutamic acid in a molar ratio of 1:5 was used as a cleaning agent was set.
(1) Crushing: firstly, transferring 25kg of waste polyester bottle chips into a freezing chamber at the temperature of 5-10 ℃, standing, carrying out freezing treatment for 12 hours, transferring out, and preparing into particles with the particle size of 3-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: feeding the obtained waste polyester particles into a drum-type cleaning machine, spraying 100kg of cleaning solution at 50-55 ℃ in the drum-type cleaning machine, cleaning for 10min at the rotating speed of 500rpm, discharging the cleaning solution after cleaning, and then discharging the waste polyester particles; the cleaning solution is prepared by dissolving a cleaning agent in water, wherein the cleaning agent is decyl glucoside-pyroglutamic acid esterified substance, the dosage of the cleaning agent is 5g of decyl glucoside and pyroglutamic acid dissolved in 1kg of water, and the molar ratio of the decyl glucoside to the pyroglutamic acid is 1: 5;
(3) drying: feeding the cleaned polyester particles into a 70-75 ℃ roller dryer, and drying at a rotating speed of 300rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 255-260 ℃; the weight ratio of the polyester particles to the tackifier is 100:10, and the tackifier consists of trimethylolpropane triglycidyl ether, poly dipentaerythritol hexaacrylate and stearyl glycyrrhetinate in a weight ratio of 2:1: 0.5;
(5) die head output: and (3) conveying the plasticized material into a die head through a runner, and outputting a sheet through the die head, wherein the temperature of the runner is 250-255 ℃, and the temperature of the die head is 260-265 ℃.
Example 4
The same batch of waste polyester bottle chips were tackified in examples 1 to 3 and comparative examples 1 to 4, respectively, and the intrinsic viscosity of the PET melt obtained in the extruder of step (4) (using an Ubbelohde viscometer) and the dust/oil stain removal rate of the waste polyester pellets discharged in step (2) were measured, and the results are shown in Table 1.
TABLE 1 treatment Effect of the tackifying Process of the invention on waste polyester bottle flakes
As can be seen from Table 1, the present invention adopts decyl glucoside-pyroglutamic acid esterified product as cleaning agent to significantly improve the rate of removing dirt and oil, and adopts trimethylolpropane triglycidyl ether, polydipentaerythritol hexaacrylate and stearyl glycyrrhetinate as tackifier to realize physical tackifying method to make the intrinsic viscosity of the obtained PET melt reach more than 1 dL/g.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The tackifying process for processing the high-modulus low-shrinkage polyester yarns by utilizing the recycled polyester bottle chips is characterized by comprising the following steps of:
(1) crushing: firstly, transferring the waste polyester bottle flakes into a freezing chamber for standing, carrying out freezing treatment, then transferring out, and preparing into particles with the particle size of 1-5 mm by a pulverizer to obtain waste polyester particles;
(2) cleaning: sending the obtained waste polyester particles into a drum-type cleaning machine, spraying cleaning liquid in the drum-type cleaning machine, cleaning at the rotating speed of 300-500 rpm, discharging the cleaning liquid after cleaning, and then discharging the waste polyester particles;
(3) drying: feeding the cleaned polyester particles into a roller dryer, and drying at the rotating speed of 200-400 rpm until the water content is lower than 0.5 wt%;
(4) and (3) tackifying: adding a tackifier into the dried polyester particles, uniformly mixing in a stirrer, and then feeding into an extruder for extrusion and plasticization, wherein the heating temperature in the extruder is 250-260 ℃;
(5) die head output: the plasticized material is sent into a die head through a runner, and a sheet is output through the die head, wherein the temperature of the runner is 250-260 ℃, and the temperature of the die head is 260-270 ℃;
the tackifier in the step (4) consists of trimethylolpropane triglycidyl ether, poly dipentaerythritol hexaacrylate and stearyl glycyrrhetinate in a weight ratio of 2:1: 0.5.
2. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: the freezing temperature in the step (1) is 5-10 ℃.
3. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: the freezing treatment time in the step (1) is 8-12 h.
4. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: and (3) the temperature of the cleaning liquid in the step (2) is 45-55 ℃.
5. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: and (3) the cleaning time in the step (2) is 10-30 min.
6. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: and (4) drying at 65-75 ℃ in the step (3).
7. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: the weight ratio of the polyester particles to the tackifier in the step (4) is 100: 5-15.
8. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: and (3) the cleaning liquid in the step (2) is prepared by dissolving a cleaning agent in water.
9. The tackifying process for processing high-modulus low-shrinkage polyester yarns by utilizing recycled polyester bottle flakes according to claim 1, characterized in that: the cleaning agent is decyl glucoside, and the using amount of the decyl glucoside is 0.5-5 g of water dissolved in 1kg of water.
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| JPS63202408A (en) * | 1987-02-18 | 1988-08-22 | Toshiba Mach Co Ltd | Production equipment of reclaimed pellet of waste pet resin film or the like |
| EP0492043A2 (en) * | 1990-12-27 | 1992-07-01 | Taiyo Electric Industry Co., Ltd | Method for recycling treatment of refuse of plastic molded articles and apparatus therefor |
| CN103422182A (en) * | 2013-08-19 | 2013-12-04 | 大连恒源纤维科技有限公司 | Regenerated polyester short-cut fiber |
| CN109651775A (en) * | 2018-12-25 | 2019-04-19 | 南通新帝克单丝科技股份有限公司 | A kind of chemical thickening method of reuse polyethylene terephthalate |
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| JPS63202408A (en) * | 1987-02-18 | 1988-08-22 | Toshiba Mach Co Ltd | Production equipment of reclaimed pellet of waste pet resin film or the like |
| EP0492043A2 (en) * | 1990-12-27 | 1992-07-01 | Taiyo Electric Industry Co., Ltd | Method for recycling treatment of refuse of plastic molded articles and apparatus therefor |
| CN103422182A (en) * | 2013-08-19 | 2013-12-04 | 大连恒源纤维科技有限公司 | Regenerated polyester short-cut fiber |
| CN109651775A (en) * | 2018-12-25 | 2019-04-19 | 南通新帝克单丝科技股份有限公司 | A kind of chemical thickening method of reuse polyethylene terephthalate |
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