Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Technology for producing direct spinning terylene industrial filaments after liquid state polycondensation of prepolymer

A liquid phase viscosifying and production process technology, applied in the field of spinning, can solve the problems of unstable polyester industrial yarn product quality, high production cost pressure, complex procedures, etc. shortening effect

Active Publication Date: 2011-11-23
ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. From the point of view of the production process, the final polycondensation process, the solid-state polycondensation process, and the screw extruder melting and slicing process consume a lot of energy, and the process is complicated, and there is a certain production consumption. It can be seen that no matter the traditional production method It is still a new technology of liquid-phase viscosifying melt direct spinning, and the production cost pressure is relatively high.
[0008] 2. In the direct spinning production process of liquid-phase viscosified melt, due to the high viscosity of the melt obtained by final polycondensation, it will require a lot of energy to transport such a high-viscosity melt to the liquid-phase viscosified process, including melting Pressure increase, temperature insulation, etc., all of which have certain technical difficulties
[0009] To sum up, in the existing production process of polyester chips, the process of final polycondensation, solid-state polymerization, and the processes of melt spinning of chips into the screw extruder will go through repeated heating, cooling, melt solidification, pellet injection and remelting, etc. process, resulting in a sharp increase in energy consumption. At the same time, the dust, debris and viscosity difference between the inside and outside of the high-viscosity slices during the production process will lead to unstable quality of existing polyester industrial yarn products.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Technology for producing direct spinning terylene industrial filaments after liquid state polycondensation of prepolymer
  • Technology for producing direct spinning terylene industrial filaments after liquid state polycondensation of prepolymer
  • Technology for producing direct spinning terylene industrial filaments after liquid state polycondensation of prepolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1: Production of high-strength polyester industrial yarn

[0063] 1. Esterification: Put ethylene glycol and phthalic acid in a molar ratio of 1 to 1.3, put in catalyst, trimethyl phosphate, and electrostatic adsorbent to mix into a slurry, and carry out esterification reaction at a temperature of 230 to 260°C to obtain Ethylene terephthalate melt BHET;

[0064] 2. Pre-condensation: Carry out pre-condensation reaction at a temperature of 230-290 ° C and a pressure of 50-1000 Pa for 1.5-2 hours, and discharge when the melt viscosity is 0.3-0.4 dl / g measured by a viscometer;

[0065] 3. Liquid phase thickening: such as Figure 4 As shown, the melt prepared by precondensation is discharged through the melt jacket three-way valve 1, the prepolymer booster pump 2 (commonly known as the gear pump) is pressurized, and the melt three-way valve 3 is collected, and then passed through the double-connected Type melt filter 4 (double parallel connection can be switched...

Embodiment 2

[0067] Embodiment 2: Production of low-shrinkage polyester industrial filament

[0068] 1. Esterification: Put ethylene glycol and phthalic acid in a molar ratio of 1 to 1.3, put in catalyst, trimethyl phosphate, and electrostatic adsorbent to mix into a slurry, and carry out esterification reaction at a temperature of 230 to 260°C to obtain Ethylene terephthalate melt BHET;

[0069] 2. Pre-condensation: Carry out pre-condensation reaction at a temperature of 230-290 ° C and a pressure of 50-1000 Pa for 1.5-2 hours, and discharge when the melt viscosity is 0.3-0.4 dl / g measured by a viscometer;

[0070] 3. Viscosification in liquid phase: Put the above-mentioned melt in a vertical reactor for liquid phase viscosification. The melt enters and distributes from the top, and forms a film naturally under the action of gravity. The vacuum degree in the kettle is 50Pa~100Pa, and the temperature is 280℃ ~295°C, melt residence time 40min~90min. After liquid-phase thickening, the melt...

Embodiment 3

[0072] Example 3: Production of high-modulus low-shrinkage polyester industrial yarn

[0073] 1. Esterification: Put ethylene glycol and phthalic acid in a molar ratio of 1 to 1.3, put in catalyst, trimethyl phosphate, and electrostatic adsorbent to mix into a slurry, and carry out esterification reaction at a temperature of 230 to 260°C to obtain Ethylene terephthalate melt BHET;

[0074] 2. Pre-condensation: Carry out pre-condensation reaction at a temperature of 230-290 ° C and a pressure of 50-1000 Pa for 1.5-2 hours, and discharge when the melt viscosity is 0.3-0.4 dl / g measured by a viscometer;

[0075] 3. Liquid phase thickening: The above melt is subjected to liquid phase thickening in a vertical reactor. The melt enters from the top and distributes freely, and forms a film naturally under the action of gravity. The vacuum degree in the kettle is 70Pa~120Pa, and the temperature is 290 ℃~300℃, the melt residence time is 60min~110min. After liquid-phase thickening, the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses technology for producing direct spinning terylene industrial filaments after liquid state polycondensation of prepolymer and belongs to the technical field of spinning. The technology comprises the processes of esterification, prepolycondensation, liquid state polycondensation, and spinning, and is characterized by comprising the following steps of: performing prepolycondensation reaction on esterified ethylene glycol and phthalic acid to prepare a melt with the viscosity of 0.3 to 0.4dl / g, and conveying the melt to a liquid state polycondensation kettle for liquid state polycondensation by using a booster pump; and conveying the melt to a spinning beam for spinning through a gear pump, wherein the inherent viscosity of the polyester melt after liquid state polycondensation is 0.85 to 1.05dl / g. By directly conveying the melt into the liquid state polycondensation kettle for polycondensation and performing the production technology of directly spinning the melt,the production technology for producing the direct spinning terylene industrial filaments after the liquid state polycondensation of the prepolymer shortens the process flow, reduces the production energy consumption and production cost, and solves the technical problem of difficulty in conveying the melt simultaneously.

Description

Technical field: [0001] The invention relates to a production process of directly spinning polyester industrial filaments from a precondensed melt after liquid-phase viscosification, and belongs to the technical field of spinning. Background technique: [0002] For a long time, because the polyester civilian yarn industry has been in a state of low-profit and no-profit operation, and as the thriving polyester industrial yarn in 2007 and 2008, it has become the goal of many polyester civilian yarn companies. Therefore, after 2009, the new production capacity of polyester industrial yarn has been rapid. Expansion eventually led to the current meager profit of polyester industrial yarn. At present, the quality of polyester industrial yarn has been greatly improved, and how to reduce production costs on the basis of ensuring high quality is a key issue in the field of polyester industrial yarn to enhance its own competitiveness. [0003] In the production of polyester industria...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/92D01F1/10D01D1/02D01D1/06D01D5/08D01D5/16
Inventor 王祖宏刘雄张朔李建国温国奇樊继明
Owner ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products