CN110747531A - Polyester staple fiber and preparation method thereof - Google Patents
Polyester staple fiber and preparation method thereof Download PDFInfo
- Publication number
- CN110747531A CN110747531A CN201810809814.8A CN201810809814A CN110747531A CN 110747531 A CN110747531 A CN 110747531A CN 201810809814 A CN201810809814 A CN 201810809814A CN 110747531 A CN110747531 A CN 110747531A
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- CN
- China
- Prior art keywords
- barium sulfate
- nano barium
- staple fiber
- polyester
- nano
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
Abstract
The invention provides polyester staple fibers and a preparation method thereof, belonging to the technical field of polyester fibers. The polyethylene glycol terephthalate contains a nucleating agent nano barium sulfate, the particle size of the nano barium sulfate is less than or equal to 100nm, the concentration of the nano barium sulfate in the polyethylene glycol terephthalate is 10-1000 ppm, and the specification of short fibers is 0.90 dtex-1.60 dtex multiplied by 38 mm; the nano polyethylene glycol terephthalate composite material is prepared by esterifying and polycondensing nano barium sulfate glycol suspension and polyester monomer, wherein the nucleating agent nano barium sulfate is added in the form of glycol suspension before esterification or before polycondensation after esterification. The polyester monomer is purified terephthalic acid, ethylene glycol and medium-purity terephthalic acid. The polyester staple fiber special for sewing threads has low production cost, good glossiness, high strength and low dry-heat shrinkage rate, and can meet the requirements of a sewing thread spinning process and dyeing and finishing processing.
Description
Technical Field
The invention relates to the field of textiles, in particular to a preparation method of polyester staple fiber.
Background
At present, in order to meet the speed of a high-speed flat sewing machine, high sewing thread strength, uniform yarn levelness, smooth and clean spinning threads, few defects and small knots are required, and a good sewing effect can be obtained. In recent years, textiles in China have been put into international market competition, and the quality of high-speed sewing threads directly affects the quality of clothes and the production efficiency. 0.90 dtex-1.60 dtex multiplied by 38mm bright high-strength low-elongation polyester staple fiber is a main raw material for spinning high-speed sewing threads, and due to the reasons of high difficulty in reaching or meeting the quality index of the polyester staple fiber, low product percent of pass, large quality fluctuation and the like, although some products are put on the market at home, the polyester staple fiber has the defects of high cost, low quality compared with foreign like products and the like, so that the polyester staple fiber depends on import of the products for a long time in China.
Disclosure of Invention
The invention aims to provide the polyester staple fiber and the preparation method thereof, the polyester staple fiber has low production cost, good glossiness, high strength and low dry-heat shrinkage rate, and can meet the requirements of a sewing thread spinning process and dyeing and finishing processing.
The bright sewing thread type polyester staple fiber contains nucleating agent nano barium sulfate in polyethylene terephthalate (PET), the grain diameter of the nano barium sulfate is less than or equal to 100nm, and the concentration of the nano barium sulfate in the polyethylene terephthalate is 10-1000 ppm. The specification of the short fiber is 0.90dtex to 1.60dtex multiplied by 38 mm; spinning under the following conditions: the melt temperature of a cross joint of a spinning melt is 285-287 ℃, the intrinsic viscosity of the melt is 0.640-0.645 dl/g, the melt pressure of the cross joint is 4.85-4.95 MPa, the assembly pressure is 9.90-10.1 MPa, the spinning temperature is 288-290 ℃, the spinning speed is 900-1200 m/min, the stretching temperature is 80-84 ℃, the barrel falling time is 60-80 min, the stretching speed is 260-290 m/min, and the total stretching ratio is 4.413-4.800.
The preparation method of the polyester staple fiber comprises the steps of preparing a nano polyethylene glycol terephthalate composite material by esterification and polycondensation of monomers and spinning the staple fiber, wherein the preparation method of the nano polyethylene glycol terephthalate composite material is prepared by esterification and polycondensation of nano barium sulfate glycol suspension and polyester monomers, and the nucleating agent nano barium sulfate is added in the form of glycol suspension before esterification or before polycondensation after esterification. The esterification and polycondensation of the monomers are carried out according to the prior art. The polyester monomer is Purified Terephthalic Acid (PTA), Ethylene Glycol (EG) and medium-purity terephthalic acid (QTA). The mass percentage concentration of the nano barium sulfate glycol suspension is 0-30%, and the preferable concentration is 1-15%. The concentration of the nano barium sulfate in the polyethylene terephthalate composite material is 10-1000 ppm, and the preferable concentration is 30-120 ppm. The addition amount of the medium-purity terephthalic acid (QTA) which is one of the polyester monomers is 0-30% of the pure terephthalic acid by mass percent, and the preferred concentration is 10-20%.
Compared with the prior art, the invention has the following excellent effects: the invention adopts the method that the nano nucleating agent is added, the medium-purity terephthalic acid and the polyester monomer are produced in a continuous polymerization device and simultaneously spun into short fibers, the bright high-strength low-elongation polyester short fibers with the maximum breaking strength of 6.15cN/dtex and the maximum breaking strength of 0.90dtex to 1.60dtex multiplied by 38mm are obtained, and the dry heat shrinkage rate at 180 ℃ is 3.5 percent at least. The present invention features that nano barium sulfate is added as nucleating agent. In order to ensure that the particle size of the added barium sulfate is below 100nm, the invention adopts the method of adding a directly prepared nano barium sulfate glycol suspension, rather than a suspension obtained by dispersing powder barium sulfate in glycol, wherein the adding concentration is 10-1000 ppm, preferably 20-120 ppm. The addition of nano barium sulfate can increase the glass transition temperature (Tg) of PET. Through Differential Scanning Calorimetry (DSC) analysis, the glass transition temperature of the PET can reach 80-85 ℃, and is increased by 6-10 ℃ compared with the glass transition temperature of common PET. The stretching of the polyester is carried out above the glass transition temperature Tg of PET. The Tg of PET increases with increasing molecular weight. For terylene, the molecular weight distribution plays a decisive role in strength, and the increase of low molecular weight polymers leads to easy breakage and reduced strength of the fiber under stress. Polymers with a narrow molecular weight distribution contribute significantly to strength. Molecular weight has a large influence on the mechanical strength. When the molecular weight is small, the number of the secondary valence bonds in the intermolecular interaction is small, so that the intermolecular interaction force is reduced and the intermolecular slip is likely to occur. Although the viscosity of PET is improved, the method is an effective method for improving the strength of the terylene, the energy consumption is inevitably increased, and the production cost is increased. After the nano barium sulfate is added, the particle size of the nano barium sulfate is close to the size of PET spherulites, so that the nano barium sulfate can play a role of bridging, and the result is consistent with the length of an increased molecular chain, so that the fiber strength can be increased under the condition of not increasing the viscosity of PET. The viscosity of the PET polyester of the present invention is preferably 0.640 to 0.643 dl/g. In addition, in the production of 0.90 dtex-1.60 dtex bright sewing linear polyester staple fiber, in order to increase the strength, a small amount of TiO2 is mostly added at present, because the refractive index of TiO2 is 2.55-2.7, the refractive index of PET polyester is 1.54, slight extinction is inevitably caused, the color and luster of PET are reduced, while the refractive index of barium sulfate is only 1.64, which is very close to that of PET, and the addition amount is very small, so the self color and luster of PET cannot be changed. The melt does not contain titanium dioxide, so that the extinction effect of the existing sewing thread type short fiber caused by adding a small amount of titanium dioxide can be avoided, the fiber luster is improved, and the production cost is reduced. The invention has another characteristic that the medium-purity terephthalic acid (QTA) is added in the preparation process of the inorganic nano polyethylene terephthalate composite material, and the addition of the QTA further reduces the production cost under the condition of not influencing the quality of PET.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Example 1
The bright sewing thread type polyester staple fiber contains nucleating agent nano barium sulfate in polyethylene terephthalate (PET), the grain diameter of the nano barium sulfate is less than or equal to 100nm, and the concentration of the nano barium sulfate in the polyethylene terephthalate is 10-1000 ppm. The specification of the short fiber is 0.90dtex to 1.60dtex multiplied by 38 mm; spinning under the following conditions: the melt temperature of a cross joint of a spinning melt is 285-287 ℃, the intrinsic viscosity of the melt is 0.640-0.645 dl/g, the melt pressure of the cross joint is 4.85-4.95 MPa, the assembly pressure is 9.90-10.1 MPa, the spinning temperature is 288-290 ℃, the spinning speed is 900-1200 m/min, the stretching temperature is 80-84 ℃, the barrel falling time is 60-80 min, the stretching speed is 260-290 m/min, and the total stretching ratio is 4.413-4.800.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the 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 (2)
1. A polyester staple fiber is characterized in that polyethylene glycol terephthalate contains a nucleating agent nano barium sulfate, the particle size of the nano barium sulfate is less than or equal to 100nm, the concentration of the nano barium sulfate in the polyethylene glycol terephthalate is 10-1000 ppm, and the specification of the staple fiber is 0.90 dtex-1.60 dtex multiplied by 38 mm; spinning under the following conditions: the melt temperature of a cross joint of a spinning melt is 285-287 ℃, the intrinsic viscosity of the melt is 0.640-0.645 dl/g, the melt pressure of the cross joint is 4.85-4.95 MPa, the assembly pressure is 9.90-10.1 MPa, the spinning temperature is 288-290 ℃, the spinning speed is 900-1200 m/min, the stretching temperature is 80-84 ℃, the barrel falling time is 60-80 min, the stretching speed is 260-290 m/min, and the total stretching ratio is 4.413-4.800.
2. The method for preparing the lustrous sewing thread type polyester staple fiber according to claim 1, which comprises preparing nano polyethylene terephthalate composite material by esterification and polycondensation of monomers, and spinning the staple fiber, wherein the nano polyethylene terephthalate composite material is prepared by esterification and polycondensation of nano barium sulfate glycol suspension and polyester monomer, and the nucleating agent nano barium sulfate is added in the form of glycol suspension before esterification or before polycondensation after esterification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810809814.8A CN110747531A (en) | 2018-07-23 | 2018-07-23 | Polyester staple fiber and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810809814.8A CN110747531A (en) | 2018-07-23 | 2018-07-23 | Polyester staple fiber and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110747531A true CN110747531A (en) | 2020-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810809814.8A Pending CN110747531A (en) | 2018-07-23 | 2018-07-23 | Polyester staple fiber and preparation method thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN110747531A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232127A (en) * | 2022-01-25 | 2022-03-25 | 江苏江南高纤股份有限公司 | Ultralow-thermal-shrinkage polyester staple fiber and preparation method thereof |
| CN114230774A (en) * | 2022-01-25 | 2022-03-25 | 江苏江南高纤股份有限公司 | Polyester with excellent thermal stability and preparation method thereof |
-
2018
- 2018-07-23 CN CN201810809814.8A patent/CN110747531A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232127A (en) * | 2022-01-25 | 2022-03-25 | 江苏江南高纤股份有限公司 | Ultralow-thermal-shrinkage polyester staple fiber and preparation method thereof |
| CN114230774A (en) * | 2022-01-25 | 2022-03-25 | 江苏江南高纤股份有限公司 | Polyester with excellent thermal stability and preparation method thereof |
| CN114232127B (en) * | 2022-01-25 | 2023-03-14 | 江苏江南高纤股份有限公司 | Ultralow-thermal-shrinkage polyester staple fiber and preparation method thereof |
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Application publication date: 20200204 |
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| WD01 | Invention patent application deemed withdrawn after publication |