CN108505128B - Preparation method of colored recycled polyester DTY (draw textured yarn) - Google Patents

Preparation method of colored recycled polyester DTY (draw textured yarn) Download PDF

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CN108505128B
CN108505128B CN201810144222.9A CN201810144222A CN108505128B CN 108505128 B CN108505128 B CN 108505128B CN 201810144222 A CN201810144222 A CN 201810144222A CN 108505128 B CN108505128 B CN 108505128B
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dye
recycled polyester
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CN108505128A (en
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戴泽新
戴梦茜
王华平
陈烨
王少博
朱金亚
吉鹏
王卫星
朱闻宇
毛晓彬
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Elite Color Environmental Resources Science & Technology Co ltd
JIANGSU HENGZE COMPOSITE MATERIAL TECHNOLOGY CO LTD
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Elite Color Environmental Resources Science & Technology Co ltd
JIANGSU HENGZE COMPOSITE MATERIAL TECHNOLOGY CO LTD
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • 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
    • D01D1/06—Feeding liquid to the spinning head
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • 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
    • D01F1/06—Dyes
    • 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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  • Chemical & Material Sciences (AREA)
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Abstract

The invention relates to a preparation method of colored recycled polyester DTY (draw textured yarn) (1) crushing waste polyester to obtain waste polyester chips; (2) performing coarse color matching on the waste polyester chips by adopting an RGB (Red, Green and blue) ternary color matching method to obtain a product I; (3) adding the product I into an alcohol solution containing a catalyst for degradation to generate a monomer and/or an oligomer; (4) separating and purifying the monomer and/or oligomer, and then carrying out polymerization reaction to generate a polymer melt; (5) finely matching the polymer melt by adopting an RGB ternary color matching method to obtain a product II; (6) spinning the product II to obtain the colored regenerated polyester DTY fiber. The invention overcomes the defects of poor stability, low accuracy, time and labor consumption and the like of manual color matching in the prior art, realizes online automatic color matching compensation during the production of colored polyester by adopting an RGB ternary color matching method, improves the stability and the accuracy of polyester color matching, and has very good application prospect.

Description

Preparation method of colored recycled polyester DTY (draw textured yarn)
Technical Field
The invention belongs to the field of production of colored recycled polyester, and relates to a preparation method of colored recycled polyester DTY (draw textured yarn).
Background
Polyester is used as a petroleum-based synthetic polymer material which is not easy to degrade, the social reserve of waste products is very large, and in view of the pressure of environmental protection and various resources, research on recycling of polyester is becoming a hot spot of people's attention. The waste polyester alcoholysis repolymerization is to utilize reversibility of polycondensation reaction, depolymerize the waste polyester into a monomer or a polymerization intermediate, and after separation and purification, the waste polyester can be repolymerized into high-quality regenerated polyester. Therefore, the closed type cyclic regeneration of the waste polyester can be realized, and the alcoholysis regeneration method has absolute advantages in the theory for recovering the waste polyester textiles with high impurity content.
Currently, a manual color matching method is adopted in the color matching process. The skilled artisan relies on experience to determine the dyeing recipe. The manual color matching method has poor stability, low one-time accuracy and time and labor waste, and the color of the polyester can be changed along with the processing technology in the processing process.
Therefore, it is very important to research a preparation method of colored recycled polyester capable of automatically matching colors on line in the processing process.
Disclosure of Invention
The invention aims to overcome the defects of poor stability, low accuracy, time and labor waste and the like caused by manual color matching when the color matching is carried out on the recycled polyester in the prior art, and provides a preparation method of a colored recycled polyester DTY capable of automatically carrying out online color matching in the polyester processing process. The invention adopts RGB three primary colors principle to distribute a color component with an intensity value in the range of 0-255. The color with different shades can be obtained by adjusting the related numbers, and the color is described and measured by a mathematical method. Before the regenerated polyester raw material is added into the alcoholysis reaction kettle and in the spinning process, the color difference between the regenerated polyester raw material and the color of the polymer and the color of the target product is automatically detected by an RGB color detection system, the color is converted into RGB hexadecimal color code numerical values, and the color code numerical value difference is compared. And then feeding the data back to a dye feeding system, and automatically adding the dye with the color code higher/lower than the corresponding R, G, B color code value to ensure that the difference value of the color codes is smaller than the specified error range. And the online automatic and accurate color matching compensation is realized by twice color matching before feeding and in the polymerization process. The waste polyester alcoholysis repolymerization is to utilize reversibility of polycondensation reaction, depolymerize the waste polyester into a monomer or a polymerization intermediate, and after separation and purification, the waste polyester can be repolymerized into high-quality regenerated polyester. Therefore, the closed type cyclic regeneration of the waste polyester can be realized, and the alcoholysis regeneration method has absolute advantages in the theory for recovering the waste polyester textiles with high impurity content.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of colored recycled polyester DTY comprises the following steps:
(1) crushing the waste polyester to obtain waste polyester chips;
(2) performing coarse color matching on the waste polyester chips by adopting an RGB (Red, Green and blue) ternary color matching method to obtain a product I, wherein the coarse color matching refers to a process of adjusting the color of the waste polyester to be close to that of a target product by adding a dye;
(3) adding the product I into an alcohol solution containing a catalyst for degradation to generate a monomer and/or an oligomer;
(4) separating and purifying the monomer and/or oligomer, and then carrying out polymerization reaction to generate a polymer melt;
(5) finely matching the polymer melt by adopting an RGB (Red, Green and blue) ternary color matching method to obtain a product II, wherein the finely matching refers to a process of adjusting the color of the polymer melt to be closer to that of a target product by adding a dye;
(6) and metering, extruding, cooling, oiling and winding the product II to obtain colored recycled polyester POY (polyester pre-oriented yarn) fibers, and respectively passing the colored recycled polyester POY fibers through a first roller, a first hot box, a cooling plate, a false twister, a second roller, a network nozzle, a second hot phase, a third roller, an oil wheel and winding after balancing for 8 hours to obtain the colored recycled polyester DTY fibers.
As a preferred technical scheme:
according to the preparation method of the colored recycled polyester DTY, the color difference grade of the colored recycled polyester DTY is 4-5.
The preparation method of the colored recycled polyester DTY yarn is characterized in that the coarse color matching is carried out in a feeding device, and the fine color matching is carried out in a polymerization kettle; the feeding device and the polymerization kettle are both simultaneously provided with the RGB color sensing system and the automatic dye feeding system, so that the product color can be detected on line, the color of the product can be compared with the color of a target product, the color difference is compared with the color position database, and the data is fed back to the dye feeding system, so that automatic color matching is realized.
According to the preparation method of the colored recycled polyester DTY, the RGB color sensing system comprises a color sensor, an illumination light source, a signal processing circuit and a single chip microcomputer; the color sensor realizes color detection by measuring the reflectance of three primary colors constituting the color of the object, and the illumination light source constitutes an illumination system with white light emitting diodes.
The method for preparing the colored recycled polyester DTY comprises the steps that the automatic dye feeding system comprises a feedback signal processor, an RGB dye color recognizer, a dye hopper, a dye weigher and a dye feeding device.
The preparation method of the colored recycled polyester DTY comprises the following steps:
firstly, under the irradiation of an illumination light source, a signal generated by a color sensor sensing the color of a measured object is amplified by a signal processing circuit and then is sent to a single chip microcomputer for processing, the single chip microcomputer sends the processed signal to a color locus database, and the illumination light source uses a white light emitting diode to form an annular 45 degree (illumination)/0 degree (measurement) annular illumination system;
then, the color locus database converts the signals into RGB hexadecimal color codes and compares the RGB hexadecimal color codes with the RGB hexadecimal color codes of the target product, when the error between more than one numerical value in the R, G, B hexadecimal color codes and the RGB hexadecimal color codes of the target product is larger than a set value, the single chip receives signals generated by the color sensor and amplified by the signal processing circuit and then processes the signals to obtain color difference values, the color difference value signals are sent to the feedback signal processor for processing, the feedback signal processor identifies the colors of the dyes through the RGB dye color identifier and sends the processed color difference value signals to the dye weighing device and the dye hopper with the corresponding color, the dye hopper feeds the dyes into the dye weighing device until the weight reaches the target value, and the dye weighing device feeds the dyes into the dye feeding device;
finally, the dye feeding device gradually adds the dye matched with the required hexadecimal color code, and the dye is repeatedly identified and processed by the color sensor and the singlechip until the error is less than or equal to a set value;
the color location database is composed of 16777216 colors which can be represented by RGB hexadecimal color codes.
In the method for preparing the colored recycled polyester DTY, the set value in the coarse color matching is 20, and the set value in the fine color matching is 5.
The preparation method of the colored recycled polyester DTY comprises the steps of preparing alcohol solution from methanol, ethylene glycol, propylene glycol, 1, 4-butanediol, glycerol or pentaerythritol; the catalyst is zinc acetate, manganese acetate, cobalt acetate, lead acetate, sodium carbonate, sodium bicarbonate, sodium sulfate, potassium sulfate, titanium phosphate or ionic liquid.
In the preparation method of the colored recycled polyester DTY, the cation of the ionic liquid is
Figure BDA0001578376020000031
Wherein R is1，R2，R3，R4The alkyl groups have different carbon atoms, and R is the alkyl group; the anion of the ionic liquid is PF6 -、BF4 -、CH3SO3 -、F3CSO3 -、(F3CSO2)3C-、Br-Or Cl-Ionic liquids meeting the above conditions are suitable for use in the present invention.
According to the preparation method of the colored recycled polyester DTY, the main spinning process parameters of the colored recycled polyester POY fiber are as follows:
spinning temperature: 270-290 ℃;
spinning speed: 2000-2500 m/min;
stretching temperature: 60-80 ℃;
total draft magnification: 1.5 to 4.5;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows:
linear velocity of first roller: 200-500 m/min;
linear velocity of the second roller: 400-500 m/min;
linear velocity of third roller: 200-500 m/min;
linear velocity of winding roller: 300-600 m/min;
draft ratio: 1.1 to 1.5;
false twist D/Y ratio: 1.2 to 2.5.
Has the advantages that:
according to the preparation method of the colored recycled polyester DTY, in the process of color matching of the recycled polyester, the RGB color detection system is used for detecting the color difference between the color in the processing process and the color of a target product, the color difference is compared with the color position database, then the data is fed back to the dye feeding system, and the required color and the required amount of dye are automatically added, so that online automatic color matching compensation is realized, the stability and the accuracy are more excellent, the defects of unstable and inaccurate color matching and the like caused by manual color matching in the prior art are overcome, and the preparation method has great application prospects.
Drawings
Fig. 1 is a schematic diagram of a process for preparing colored recycled polyester DTY yarn of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A preparation method of colored recycled polyester DTY (draw textured yarn) is shown in figure 1 and comprises the following steps:
(1) establishing a color matching database comprising recycled polyester data, dye formula data and color location data, wherein the recycled polyester data comprises: lot number, name, color, raw material category; the dye formula data included: reactive dyes, vat dyes and disperse dyes, wherein 1) the reactive dye data comprises: the type of reactive dye, the fuel dosage of the padding liquor, the wetting agent dosage of the padding liquor, the caustic soda dosage of the fixing liquor, the trisodium phosphate dosage of the fixing liquor, the soda dosage of the fixing liquor, the salt dosage of the fixing liquor, the liquor dosage of the fixing liquor and the concentration of the soaping liquor; 2) vat dye data include: dye dosage of padding liquor, diffusant dosage of padding liquor, color type of padding liquor, caustic soda dosage of reducing liquor, insurance dosage of reducing liquor, color type of reducing liquor, hydrogen peroxide dosage of oxidizing liquor, liquid soap dosage of soaping liquor and soda dosage of soaping liquor; 3) the disperse dye data include: disperse dye name, migration resistance dose, permeation dose, baking soda amount, urea amount, threne dye amount, coating amount, peregal amount, and total binder liquid amount; the color bit data includes: 16777216 colors which can be represented by RGB hexadecimal color codes;
(2) waste polyester is subjected to classification, cleaning, crushing, physical separation, cleaning, drying and coarse color matching to obtain a product I;
the rough color matching refers to adding dye into a feeding device provided with an RGB color sensing system and an automatic dye feeding system to adjust the color of regenerated polyester chips to be close to that of a target product, wherein the RGB color sensing system comprises a color sensor, an illumination light source, a signal processing circuit and a single chip microcomputer, the color sensor realizes color detection by measuring the reflection ratio of three primary colors forming the object color, and the illumination light source forms an illumination system by using white light emitting diodes; the automatic dye feeding system comprises a feedback signal processor, an RGB dye color recognizer, a dye hopper, a dye weigher and a dye feeding device;
(3) depolymerizing, separating, purifying, polymerizing and finely matching the product I to obtain a product II;
the specific process is as follows: adding methanol containing zinc acetate into a polymerization kettle provided with an RGB color sensing system and an automatic dye feeding system for degradation to generate monomers and/or oligomers, carrying out polymerization on the monomers and/or oligomers after separation and purification to generate a polymer melt, and finally adding a dye into the polymer melt to adjust the color of the regenerated polyester after coarse color matching so that the regenerated polyester is closer to the color of a target product;
the process of coarse color matching or fine color matching in the steps (2) and (3) is specifically as follows:
firstly, under the irradiation of an illumination light source, a signal generated by a color sensor sensing the color of a measured object is amplified by a signal processing circuit and then is sent to a single chip microcomputer for processing, and the single chip microcomputer sends the processed signal to a color locus database;
then, the color locus database converts the signals into RGB hexadecimal color codes and compares the RGB hexadecimal color codes with the RGB hexadecimal color codes of the target product, when the error between more than one numerical value in the R, G, B hexadecimal color codes and the RGB hexadecimal color codes of the target product is larger than a set value, the single chip receives signals generated by the color sensor and amplified by the signal processing circuit and then processes the signals to obtain color difference values, the color difference value signals are sent to the feedback signal processor for processing, the feedback signal processor identifies the colors of the dyes through the RGB dye color identifier and sends the processed color difference value signals to the dye weighing device and the dye hopper with the corresponding color, the dye hopper feeds the dyes into the dye weighing device until the weight reaches the target value, and the dye weighing device feeds the dyes into the dye feeding device;
finally, the dye feeding device gradually adds the dye matched with the required hexadecimal color code, and the dye is repeatedly identified and processed by the color sensor and the singlechip until the error is less than or equal to a set value, wherein the set value in the coarse color matching is 20, and the set value in the fine color matching is 5;
(4) metering, extruding, cooling, oiling and winding the product II to prepare colored recycled polyester POY fiber, and respectively passing the colored recycled polyester POY fiber through a first roller, a first hot box, a cooling plate, a false twister, a second roller, a network nozzle, a second hot phase, a third roller, an oil wheel and winding after balancing the colored recycled polyester POY fiber for 8 hours to prepare colored recycled polyester DTY fiber;
the main spinning process parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 280 ℃; the spinning speed is 2300 m/min; the stretching temperature is 70 ℃; the total draft magnification is 3;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear speed of the first roller is 350 m/min; the linear speed of the second roller is 450 m/min; the linear speed of the third roller is 350 m/min; the linear speed of the winding roller is 450 m/min; the draw ratio was 1.3; the false twist D/Y ratio was 1.7.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 4 grade.
Comparative example
A method for preparing colored recycled polyester DTY yarn, which comprises substantially the same steps as in example 1, except that it does not have a coarse color matching process, and the color difference grade of the finally prepared colored recycled polyester staple fiber is 3. In comparison with example 1, it can be found that: the two-time color matching process can obviously improve the color difference grade of the product and solve the problem of large color difference.
Example 2
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is glycol containing manganese acetate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 270 ℃; the spinning speed is 2000 m/min; the stretching temperature is 60 ℃; the total draft magnification is 1.5;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear velocity of the first roller is 200 m/min; the linear speed of the second roller is 400 m/min; the linear velocity of the third roller is 200 m/min; the linear speed of the winding roller is 300 m/min; the draw ratio was 1.1; the false twist D/Y ratio was 1.2.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 5 grade.
Example 3
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is propylene glycol containing cobalt acetate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 290 ℃; the spinning speed is 2500 m/min; the stretching temperature is 80 ℃; the total draft magnification is 4.5;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear velocity of the first roller is 500 m/min; the linear velocity of the second roller is 500 m/min; the linear velocity of the third roller is 500 m/min; the linear speed of the winding roller is 600 m/min; the draw ratio was 1.5; the false twist D/Y ratio was 2.5.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 4 grade.
Example 4
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is 1, 4-butanediol containing lead acetate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 275 ℃; the spinning speed is 2050 m/min; the stretching temperature is 62 ℃; the total draft magnification is 1.6;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear speed of the first roller is 250 m/min; the linear speed of the second roller is 410 m/min; the linear velocity of the third roller is 220 m/min; the linear speed of the winding roller is 330 m/min; the draw ratio was 1.4; the false twist D/Y ratio was 1.6.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 5 grade.
Example 5
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is glycerin containing sodium carbonate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 277 ℃; the spinning speed is 2100 m/min; the stretching temperature is 63 ℃; the total draft magnification is 1.7;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear velocity of the first roller is 230 m/min; the linear speed of the second roller is 430 m/min; the linear speed of the third roller is 240 m/min; the linear speed of the winding roller is 340 m/min; the draw ratio was 1.3; the false twist D/Y ratio was 1.5.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 5 grade.
Example 6
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is pentaerythritol of sodium bicarbonate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 278 ℃; the spinning speed is 2200 m/min; the stretching temperature is 66 ℃; the total draft magnification is 2.0;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear velocity of the first roller is 270 m/min; the linear speed of the second roller is 420 m/min; the linear speed of the third roller is 300 m/min; the linear speed of the winding roller is 380 m/min; the draw ratio was 1.4; the false twist D/Y ratio was 1.8.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 4.5 grade.
Example 7
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is methanol of sodium sulfate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 280 ℃; the spinning speed is 2250 m/min; the stretching temperature is 68 ℃; the total draft magnification is 2.2;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear speed of the first roller is 260 m/min; the linear speed of the second roller is 430 m/min; the linear speed of the third roller is 320 m/min; the linear speed of the winding roller is 400 m/min; the draw ratio was 1.3; the false twist D/Y ratio was 1.9.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 4.5 grade.
Example 8
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is glycol of potassium sulfate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 281 ℃; the spinning speed is 2300 m/min; the stretching temperature is 70 ℃; the total draft magnification is 2.2;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear speed of the first roller is 360 m/min; the linear speed of the second roller is 460 m/min; the linear speed of the third roller is 360 m/min; the linear speed of the winding roller is 360 m/min; the draw ratio was 1.5; the false twist D/Y ratio was 1.8.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 4.5 grade.
Example 9
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is propylene glycol of titanium phosphate, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 280 ℃; the spinning speed is 2400 m/min; the stretching temperature is 66 ℃; the total draft magnification is 1.9;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear velocity of the first roller is 400 m/min; the linear speed of the second roller is 400 m/min; the linear speed of the third roller is 400 m/min; the linear speed of the winding roller is 500 m/min; the draw ratio was 1.4; the false twist D/Y ratio was 2.1.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 5 grade.
Example 10
A preparation method of colored recycled polyester DTY (draw textured yarn) yarn is basically consistent with the step of example 1, except that in the fine color matching process, the added alcohol solution containing catalyst is propylene glycol of chlorinated-1 butyl-3 methyl imidazole salt, and in the process of preparing colored recycled polyester DTY fiber from a product II, the main spinning technological parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 283 ℃; the spinning speed is 2400 m/min; the stretching temperature is 72 ℃; the total draft magnification is 3.8;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear velocity of the first roller is 380 m/min; the linear speed of the second roller is 370 m/min; the linear speed of the third roller is 390 m/min; the linear speed of the winding roller is 420 m/min; the draw ratio was 1.3; the false twist D/Y ratio was 2.0.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 4 grade.
Example 11
A method for preparing colored recycled polyester DTY yarn, the steps of which are substantially the same as those of example 1, except that in the fine color matching process, the alcohol solution containing the catalyst is ethylene glycol of 1-butyl-3 methylimidazolium hexafluorophosphate, and in the process of preparing colored recycled polyester DTY fiber from the product II, the main spinning process parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 286 ℃; the spinning speed is 2400 m/min; the stretching temperature is 76 ℃; the total draft magnification is 4.0;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear velocity of the first roller is 400 m/min; the linear speed of the second roller is 450 m/min; the linear speed of the third roller is 380 m/min; the linear speed of the winding roller is 540 m/min; the draw ratio was 1.5; the false twist D/Y ratio was 2.3.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 5 grade.
Example 12
A method for preparing colored recycled polyester DTY filament, the steps of which are substantially the same as those of example 1, except that in the fine color matching process, the alcohol solution containing the catalyst is pentaerythritol of 1-butyl-3 methylimidazolium tetrafluoroborate, and in the process of preparing colored recycled polyester DTY fiber from the product II, the main spinning process parameters of the colored recycled polyester POY fiber are as follows: the spinning temperature is 280 ℃; the spinning speed is 2450 m/min; the stretching temperature is 69 ℃; the total draft magnification is 4.3;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows: the linear speed of the first roller is 450 m/min; the linear speed of the second roller is 440 m/min; the linear speed of the third roller is 300 m/min; the linear speed of the winding roller is 500 m/min; the draw ratio was 1.5; the false twist D/Y ratio was 2.3.
The color difference grade of the finally prepared colored recycled polyester DTY fiber is 4 grade.

Claims (9)

1. A preparation method of colored recycled polyester DTY (draw textured yarn) is characterized by comprising the following steps: the method comprises the following steps:
(1) crushing the waste polyester to obtain waste polyester chips;
(2) performing coarse color matching on the waste polyester chips by adopting an RGB (Red, Green and blue) ternary color matching method to obtain a product I, wherein the coarse color matching refers to a process of adjusting the color of the waste polyester to be close to that of a target product by adding a dye;
(3) adding the product I into an alcohol solution containing a catalyst for degradation to generate a monomer and/or an oligomer;
(4) separating and purifying the monomer and/or oligomer, and then carrying out polymerization reaction to generate a polymer melt;
(5) finely matching the polymer melt by adopting an RGB (Red, Green and blue) ternary color matching method to obtain a product II, wherein the finely matching refers to a process of adjusting the color of the polymer melt to be closer to that of a target product by adding a dye;
(6) metering, extruding, cooling, oiling and winding the product II to prepare colored recycled polyester POY fiber, and respectively passing the colored recycled polyester POY fiber through a first roller, a first hot box, a cooling plate, a false twister, a second roller, a network nozzle, a second hot phase, a third roller, an oil wheel and winding after balancing the colored recycled polyester POY fiber for 8 hours to prepare colored recycled polyester DTY fiber;
the coarse color matching in the step (2) is carried out in a feeding device, and the fine color matching in the step (5) is carried out in a polymerization kettle; and both the feeding device and the polymerization kettle are simultaneously provided with an RGB color sensing system and an automatic dye feeding system.
2. The method for preparing the colored recycled polyester DTY yarn as claimed in claim 1, wherein the color difference grade of the colored recycled polyester DTY fiber is 4-5 grade.
3. The method for preparing the colored recycled polyester DTY yarn as claimed in claim 1, wherein the RGB color sensing system comprises a color sensor, an illumination light source, a signal processing circuit and a single chip microcomputer; the color sensor realizes color detection by measuring the reflectance of three primary colors constituting the color of the object, and the illumination light source constitutes an illumination system with white light emitting diodes.
4. The method of claim 3, wherein the automatic dye feeding system comprises a feedback signal processor, an RGB dye color recognizer, a dye hopper, a dye scale and a dye feeding device.
5. The method for preparing the colored recycled polyester DTY yarn as claimed in claim 4, wherein the coarse color matching or the fine color matching process comprises the following steps:
firstly, under the irradiation of an illumination light source, a signal generated by a color sensor sensing the color of a measured object is amplified by a signal processing circuit and then is sent to a single chip microcomputer for processing, and the single chip microcomputer sends the processed signal to a color locus database;
then, the color locus database converts the signals into RGB hexadecimal color codes and compares the RGB hexadecimal color codes with the RGB hexadecimal color codes of the target product, when the error between more than one numerical value in the R, G, B hexadecimal color codes and the RGB hexadecimal color codes of the target product is larger than a set value, the single chip receives signals generated by the color sensor and amplified by the signal processing circuit and then processes the signals to obtain color difference values, the color difference value signals are sent to the feedback signal processor for processing, the feedback signal processor identifies the colors of the dyes through the RGB dye color identifier and sends the processed color difference value signals to the dye weighing device and the dye hopper with the corresponding color, the dye hopper feeds the dyes into the dye weighing device until the weight reaches the target value, and the dye weighing device feeds the dyes into the dye feeding device;
finally, the dye feeding device gradually adds the dye matched with the required hexadecimal color code, and the dye is repeatedly identified and processed by the color sensor and the singlechip until the error is less than or equal to a set value;
the color location database is composed of 16777216 colors which can be represented by RGB hexadecimal color codes.
6. The method for preparing colored recycled polyester DTY of claim 5, wherein the set value in the coarse color matching is 20, and the set value in the fine color matching is 5.
7. The method for preparing colored recycled polyester DTY yarn according to claim 1, wherein the alcohol solution is methanol, ethylene glycol, propylene glycol, 1, 4-butanediol, glycerol or pentaerythritol; the catalyst is zinc acetate, manganese acetate, cobalt acetate, lead acetate, sodium carbonate, sodium bicarbonate, sodium sulfate, potassium sulfate, titanium phosphate or ionic liquid.
8. The method for preparing colored recycled polyester DTY (draw textured yarn) of claim 7, wherein the cation of the ionic liquid is
Figure FDA0002475506510000021
Wherein R is1，R2，R3，R4Is a number of carbon atomsR is alkyl; the anion of the ionic liquid is PF6 -、BF4 -、CH3SO3 -、F3CSO3 -、(F3CSO2)3C-、Br-Or Cl-。
9. The preparation method of the colored recycled polyester DTY yarn as claimed in claim 8, wherein the main spinning process parameters of the colored recycled polyester POY fiber are as follows:
spinning temperature: 270-290 ℃;
spinning speed: 2000-2500 m/min;
stretching temperature: 60-80 ℃;
total draft magnification: 1.5 to 4.5;
the main spinning process parameters of the colored recycled polyester DTY fiber are as follows:
linear velocity of first roller: 200-500 m/min;
linear velocity of the second roller: 400-500 m/min;
linear velocity of third roller: 200-500 m/min;
linear velocity of winding roller: 300-600 m/min;
draft ratio: 1.1 to 1.5;
false twist D/Y ratio: 1.2 to 2.5.
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