CN110670159A - Preparation process of high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filament - Google Patents
Preparation process of high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filament Download PDFInfo
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- CN110670159A CN110670159A CN201910938673.4A CN201910938673A CN110670159A CN 110670159 A CN110670159 A CN 110670159A CN 201910938673 A CN201910938673 A CN 201910938673A CN 110670159 A CN110670159 A CN 110670159A
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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
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/02—Preparation of spinning solutions
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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
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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
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
- D01D5/247—Discontinuous hollow structure or microporous structure
-
- 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
- D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/08—Addition of substances to the spinning solution or to the melt for forming hollow filaments
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- 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
Abstract
The invention discloses a preparation process of a high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filament, which comprises the following steps of: (1) respectively putting the cleaned and crushed PET bottle slices and the original PET slices into a vacuum drum oven for drying pretreatment; (2) uniformly mixing the dried PET bottle chips and the original PET chips in a reaction kettle, and melting to obtain a blending solution of the PET bottle chips and the original PET chips; (3) adding an inorganic pore-forming agent into the blending liquid prepared in the step (2), blending and melting in a reaction kettle, and extruding through a spinneret orifice with a special-shaped cross section of a double-screw extruder to obtain hollow regenerated PET fibers; (4) and (4) co-heating the hollow regenerated PET fiber prepared in the step (3) with a hydrochloric acid solution, washing with water for at least 5 times, drying, and weighing. The invention has the beneficial effects that: the hollow micro-cavity high-moisture-absorption regenerated PET fiber filament obtained by the method has a hollow interior and a surface micro-cavity structure, and the moisture regain and moisture absorption performance of the regenerated PET fiber are improved to a great extent.
Description
Technical Field
The invention relates to a process method for industrially regenerating PET (polyethylene terephthalate) fiber filaments, in particular to a preparation process for high-moisture-absorption regenerated PET fiber filaments.
Background
China is a large country for producing and using fibers, the total consumption of the fibers exceeds thirty million tons every year, and the consumption of Polyester (PET) fibers is the largest and accounts for about 35 percent of the market. With the rapid development of textile industry and the environmental protection of chemical production in recent years, the yield of polyester fiber gradually becomes a bottleneck restricting the development of textile industry. Meanwhile, the consumption of polyester also brings some subsequent environmental problems, for example, the amount of leftover waste of textiles and old clothes based on polyester is considerable, so that the environmental pollution caused by various waste chemical fiber waste materials is more and more serious, and the disposal of waste based on polyester becomes a troublesome problem. The establishment of recycling from waste to raw materials is an effective method for solving the two problems. The recycling of the waste polyester is realized, the problem of environmental pollution (waste polyester garbage comprises waste clothes, polyester films, mineral water bottles and cola bottles) can be solved, and the current situation that the yield, the scale and the like of the textile for industry in China are seriously insufficient at present can be improved. The inventory of terylene renewable resources in China mainly comprises waste polyester and waste textiles, at present, the social annual production of polyester bottles exceeds 500 million tons, and the inventory reaches 2500 million tons; the inventory of waste textiles reaches 2600 million tons, wherein 1800 million tons of chemical fibers and 800 million tons of natural fibers. Taking waste textiles as an example, the annual storage capacity of the waste textiles in key cities and areas in China is only 350 ten thousand tons at present. Therefore, under the strategic conception of strengthening ecological civilization construction and developing green recycling economy, the potential of recycling the waste textiles is great. The realization of the reasonable reuse of the waste polyester has great economic benefit and social benefit, and is an important field for developing circular economy in the textile industry of China.
The regenerated polyester fiber is fiber which takes regenerated polyester as a main raw material, and comprises short silk, long silk and the like, the raw material sources mainly comprise waste drinking water and beverage packaging bottles, membranes, clothes and non-woven fabrics, waste silk and waste blocks generated in the production process of polyester and fiber, and the polyester bottle pieces are taken as the main raw material sources. The main recovery technologies of the regenerated fiber raw materials at present comprise physical recovery, chemical recovery, recycling recovery, direct recovery and infrared treatment recovery, wherein most of the technologies adopt a chemical method and a physical method to recover waste polyester materials, and then the recovered waste polyester materials are processed into regenerated polyester fibers. The fabric developed by using the regenerated polyester fiber as the raw material is not only environment-friendly but also meets the requirements of sustainable development, and with the continuous improvement of recycling technology in China, the quality of the regenerated polyester fiber is also continuously improved, and the fabric has a tendency of gradually replacing the primary polyester fiber.
The recycling of domestic recycled polyester is far from the beginning, and the development is started at the end of 80 years in the last century. At present, the annual capacity of the domestic regenerated polyester fiber is more than 600 million tons, the actual yield is nearly 400 million tons, and the yield accounts for about 80 percent of the global total yield, and the domestic regenerated polyester fiber becomes the first production kingdom of the regenerated polyester fiber. Especially in the areas of Jiang, Zhe and Hu, there are many factories for recovering polyester bottles and many processing factories for waste bottle regenerated fibers, and a certain production scale is gradually formed, so that the aim of no waste can be basically achieved. However, compared with developed countries and regions abroad, China has not formed a scale on the aspect of waste textiles, particularly polyester products, and the recovery utilization rate, the technical level and the product grade of waste polyester have larger gaps. The situation that domestic recycled PET bottle sources seriously depend on imports is not improved, so that the demand on PET bottle chips is very high, domestic raw material supply cannot keep up with the increase of recycled PET capacity, the enterprise operating rate is low, and the contradiction between the increase of the recycled PET capacity and the raw material supply is increasingly obvious. Therefore, the types of products developed by the current enterprises for producing the regenerated PET fibers in China are few, the products developed by the enterprises are basically the same, and the innovation is lacked. Most of domestic recycled PET fiber manufacturers mainly produce short fibers because the short fibers are simple in production process and low in defective rate, and are mainly used in two fields of filling materials and weaving polyester fabrics. The single production variety causes the defect of insufficient innovation of the regenerated PET fiber in China, has single function and low additional benefit, and cannot meet the production development requirements of the regenerated PET fiber products in markets at home and abroad. Therefore, the innovative production technology of the regenerated PET fiber, the development of the regenerated fiber fabric with high economic added value and the acceleration of the development research and industrialization of the high-valued regenerated PET fiber are imperative. Aiming at the development trend of high added value products based on the regenerated PET fibers and the differentiated products of the regenerated PET fibers, the invention aims to develop the environment-friendly high-moisture-absorption regenerated PET fibers with the functions of controllable structure, hydrophilicity, moisture absorption, quick drying and the like.
Disclosure of Invention
The invention aims to provide a preparation process of a high-moisture-absorption regenerated PET fiber filament, which aims to overcome the defects in the prior art and can prepare a micro-cavity hollow regenerated PET fiber with hollow fiber inside, micro-cavities etched on the surface and high moisture regain.
The invention provides a preparation process of a high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filament, which comprises the following steps of:
(1) respectively putting the cleaned and crushed PET bottle slices and the original PET slices into a vacuum drum oven for drying pretreatment;
(2) uniformly mixing the dried PET bottle chips and the original PET chips in a reaction kettle, and melting to obtain a blending solution of the PET bottle chips and the original PET chips;
(3) adding an inorganic pore-forming agent into the blending liquid prepared in the step (2), blending and melting in a reaction kettle, and extruding through a spinneret orifice with a special-shaped cross section of a double-screw extruder to obtain hollow regenerated PET fibers;
(4) and (4) co-heating the hollow regenerated PET fiber prepared in the step (3) and a hydrochloric acid solution, washing for at least 5 times, drying, and weighing to obtain the high-moisture-absorption regenerated PET fiber filament with the micro-cavity hollow structure.
Preferably, the vacuum drying temperature in the step (1) is 150 ℃, and the drying time is 5-10 h.
Preferably, the mass ratio of the raw PET to the PET bottle chips in the blending liquid of the PET bottle chips and the raw PET chips in the step (2) is 4:100 or 6:100 or 8:100 or 10: 100.
Preferably, the melting temperature in step (2) is 250-300 ℃.
Preferably, the mass ratio of the inorganic pore-forming agent to the blend in the step (3) is 1:100 or 3:100 or 5:100 or 7:100 or 9: 100.
Preferably, the inorganic pore-forming agent in step (3) is one or more of calcium chloride, sodium carbonate or sodium dodecyl benzene sulfonate.
Preferably, the melting temperature in the step (3) is 250-300 ℃, and the melting time is 1-5 h.
Preferably, the spinneret holes of the twin-screw extruder in the step (3) are honeycomb type, cross type, round type, trilobal type and T type.
Preferably, the mass concentration of the hydrochloric acid in the step (4) is 5g/L, 10g/L, 15g/L, 20g/L, 25g/L or 30 g/L;
preferably, the co-heating time in the step (4) is 10min or 30min or 60min or 90min, and the co-heating temperature is 20 ℃ or 25 ℃ or 30 ℃ or 35 ℃ or 40 ℃.
Compared with the prior art, the invention has the beneficial effects that: the hollow micro-cavity high-moisture-absorption regenerated PET fiber filament obtained by the method has small change of thermal property and mechanical property, is hollow inside, has a surface micro-cavity structure, greatly improves the moisture regain and moisture absorption of the regenerated PET fiber, enhances the wearability of the regenerated PET fiber, and can be produced in a large scale and applied to the field of home textiles of clothes in a large area.
Drawings
FIG. 1 is a flow chart of the preparation of the high moisture absorption regenerated PET fiber filament of the present invention;
FIG. 2 is a cross-sectional hollow structure view of a high moisture absorption recycled PET fiber filament prepared in example 1 of the present invention;
fig. 3 is a structure view of surface micropockets of the high moisture absorbent recycled PET fiber filament prepared in example 1 of the present invention.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
A preparation process of high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filaments comprises the following steps:
(1) respectively putting the cleaned and crushed PET bottle slices and the original PET slices into a vacuum drum oven for drying pretreatment;
(2) uniformly mixing the dried PET bottle chips and the original PET chips in a reaction kettle, and melting to obtain a blending solution of the PET bottle chips and the original PET chips;
(3) adding an inorganic pore-forming agent into the blending liquid prepared in the step (2), blending and melting in a reaction kettle, and extruding through a spinneret orifice with a special-shaped cross section of a double-screw extruder to obtain hollow regenerated PET fibers;
(4) and (4) co-heating the hollow regenerated PET fiber prepared in the step (3) and a hydrochloric acid solution, washing for at least 5 times, drying, and weighing to obtain the high-moisture-absorption regenerated PET fiber filament with the micro-cavity hollow structure.
In the step (1), the vacuum drying temperature is 150 ℃, and the drying time is 5-10 h.
In the blending liquid of the PET bottle chips and the virgin PET chips in the step (2), the mass ratio of the virgin PET to the PET bottle chips is 4:100, 6:100, 8:100 or 10: 100.
The melting temperature in the step (2) is 250-300 ℃.
The mass ratio of the inorganic pore-forming agent to the blending liquid in the step (3) is 1:100, or 3:100, or 5:100, or 7:100, or 9: 100.
In the step (3), the inorganic pore-forming agent is one or a combination of more of calcium chloride, sodium carbonate or sodium dodecyl benzene sulfonate.
The melting temperature in the step (3) is 250-300 ℃, and the melting time is 1-5 h.
The spinneret orifice of the double-screw extruder in the step (3) is in a honeycomb type, a cross type, a circular type, a trilobal type or a T type.
The mass concentration of the hydrochloric acid in the step (4) is 5g/L, 10g/L, 15g/L, 20g/L, 25g/L or 30 g/L;
the co-heating time in the step (4) is 10min or 30min or 60min or 90min, and the co-heating temperature is 20 ℃ or 25 ℃ or 30 ℃ or 35 ℃ or 40 ℃.
Example 1 of the invention:
a preparation process of high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filaments comprises the following steps:
(1) respectively putting the cleaned and crushed PET bottle chips and the original PET chips into a vacuum drum oven, heating the PET bottle chips and the original PET chips to 150 ℃ by a vacuum dryer, and drying for 5 hours to obtain dried PET bottle chips and original PET chips;
(2) uniformly mixing the dried PET bottle chips and the original PET chips in a reaction kettle according to the mass ratio of 4:100, and melting and heating the mixture to 250 ℃ to obtain a blending solution of the PET bottle chips and the original PET;
(3) adding an inorganic pore-forming agent into the blending liquid in the step (2), wherein the mass ratio of the inorganic pore-forming agent to the mixed PET is 1:100, blending in a reaction kettle, heating to 260 ℃, melting for 1h, and extruding through honeycomb-type spinneret orifices of a double-screw extruder to obtain hollow regenerated PET fibers;
(4) and (3) co-heating the hollow regenerated PET fiber prepared in the step (3) and hydrochloric acid solution with the concentration of 5g/L, reacting for 10min at the temperature of 20 ℃, washing for 5 times, drying, and weighing to obtain the high-moisture-absorption regenerated PET fiber with the micro-cavity hollow structure.
Example 2 of the invention:
a preparation process of high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filaments comprises the following steps:
(1) respectively putting the cleaned and crushed PET bottle chips and the original PET chips into a vacuum drum oven, heating the PET bottle chips and the original PET chips to 150 ℃ by a vacuum dryer, and drying for 7 hours to obtain dried PET bottle chips and original PET chips;
(2) uniformly mixing the dried PET bottle chips and the original PET chips in a reaction kettle according to the mass ratio of 6:100, and melting and heating to 270 ℃ to obtain a blending solution of the PET bottle chips and the original PET;
(3) adding an inorganic pore-forming agent into the blending liquid in the step (2), wherein the mass ratio of the inorganic pore-forming agent to the mixed PET is 5:100, blending in a reaction kettle, heating to 280 ℃, melting for 2h, and extruding through a cross spinneret orifice of a double-screw extruder to obtain hollow regenerated PET fibers;
(4) and (4) co-heating the hollow regenerated PET fiber prepared in the step (3) and hydrochloric acid solution with the concentration of 15g/L, reacting for 30min at the temperature of 30 ℃, washing for 6 times, drying, and weighing to obtain the high-moisture-absorption regenerated PET fiber with the micro-cavity hollow structure.
Example 3 of the invention:
a preparation process of high-moisture-absorption regenerated PET (polyethylene terephthalate) fiber filaments comprises the following steps:
(1) respectively putting the cleaned PET bottle slices and the raw PET slices into a vacuum drum oven, heating the cleaned PET bottle slices and the raw PET slices to 150 ℃ by a vacuum dryer, and drying for 10 hours to obtain dried PET bottle slices and raw PET slices;
(2) uniformly mixing the dried PET bottle chips and the original PET chips in a reaction kettle according to the mass ratio of 10:100, and melting and heating the mixture to 300 ℃ to obtain a blending solution of the PET bottle chips and the original PET;
(3) adding an inorganic pore-forming agent into the blending liquid in the step (2), wherein the mass ratio of the inorganic pore-forming agent to the mixed PET is 7:100, blending in a reaction kettle, heating to 290 ℃, melting for 3h, and extruding through a trilobal spinneret orifice of a double-screw extruder to obtain hollow regenerated PET fibers;
(4) and (3) co-heating the hollow regenerated PET fiber prepared in the step (3) and hydrochloric acid solution with the concentration of 30g/L, reacting for 90min at the temperature of 40 ℃, washing for 10 times, drying, and weighing to obtain the high-moisture-absorption regenerated PET fiber with the micro-cavity hollow structure.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (10)
1. A preparation process of high-moisture-absorption regenerated PET fiber filaments is characterized by comprising the following steps: the method comprises the following steps:
(1) respectively putting the cleaned and crushed PET bottle slices and the original PET slices into a vacuum drum oven for drying pretreatment;
(2) uniformly mixing the dried PET bottle chips and the original PET chips in a reaction kettle, and melting to obtain a blending solution of the PET bottle chips and the original PET chips;
(3) adding an inorganic pore-forming agent into the blending liquid prepared in the step (2), blending and melting in a reaction kettle, and extruding through a spinneret orifice with a special-shaped cross section of a double-screw extruder to obtain hollow regenerated PET fibers;
(4) and (4) co-heating the hollow regenerated PET fiber prepared in the step (3) and a hydrochloric acid solution, washing for at least 5 times, drying, and weighing to obtain the high-moisture-absorption regenerated PET fiber filament with the micro-cavity hollow structure.
2. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: in the step (1), the vacuum drying temperature is 150 ℃, and the drying time is 5-10 h.
3. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: in the blending liquid of the PET bottle chips and the virgin PET chips in the step (2), the mass ratio of the virgin PET to the PET bottle chips is 4:100, 6:100, 8:100 or 10: 100.
4. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: the melting temperature in the step (2) is 250-300 ℃.
5. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: the mass ratio of the inorganic pore-forming agent to the blending liquid in the step (3) is 1:100, or 3:100, or 5:100, or 7:100, or 9: 100.
6. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: in the step (3), the inorganic pore-forming agent is one or a combination of more of calcium chloride, sodium carbonate or sodium dodecyl benzene sulfonate.
7. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: the melting temperature in the step (3) is 250-300 ℃, and the melting time is 1-5 h.
8. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: the spinneret orifice of the double-screw extruder in the step (3) is in a honeycomb type, a cross type, a circular type, a trilobal type or a T type.
9. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: the mass concentration of the hydrochloric acid in the step (4) is 5g/L, 10g/L, 15g/L, 20g/L, 25g/L or 30 g/L.
10. The process for preparing high moisture absorption regenerated PET fiber filament according to claim 1, characterized in that: the co-heating time in the step (4) is 10min or 30min or 60min or 90min, and the co-heating temperature is 20 ℃ or 25 ℃ or 30 ℃ or 35 ℃ or 40 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108125A (en) * | 2021-09-22 | 2022-03-01 | 安徽农业大学 | Preparation process of micro-cavity hollow uvioresistant regenerated PET (polyethylene terephthalate) fiber filament |
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