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Preparation and drying of copolymer fibers

A technology of copolymers and fibers, applied in the direction of fiber chemical characteristics, artificial filament cleaning/drying, single-component synthetic polymer rayon, etc., can solve the problems of low investment economy, expensive known methods, etc.

Active Publication Date: 2015-08-19
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Known methods of making copolymer fibers directly from polymerization solutions to produce acceptable products for ballistic and other aramid end uses are very expensive and have very low investment economics

Method used

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  • Preparation and drying of copolymer fibers
  • Preparation and drying of copolymer fibers

Examples

Experimental program
Comparison scheme
Effect test

example

[0054] Example: general situation

[0055] The copolymer is prepared by copolymerizing the monomers p-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole and terephthaloyl dichloride. The molar ratio of 5(6)-amino-2-(p-aminophenyl)benzimidazole to p-phenylenediamine is 70:30 and the molar ratio of p-phenylenediamine and 5(6)-amino-2-(p-aminophenyl) ) The molar ratio of benzimidazole and terephthaloyl dichloride is 1:1. Then a spinning solution of the polymer in sulfuric acid is prepared and the filaments are spun from the air gap in the spinneret into the coagulation bath to form the copolymer yarn. The yarn is composed of 270 filaments with a linear density of 3 denier per filament. The yarn is then washed with water and suspended onto a spool. The intrinsic viscosity and sulfur percentage are measured on this yarn sample. The resulting yarn has a sulfur content of 3.08% by weight and an intrinsic viscosity of 3.54 dl / g.

[0056] The yarn is then fed from the spool t...

example 1

[0060] First a few samples of the wet yarn were run through a low temperature drying roll operating at a constant surface temperature, and then run through a high temperature oven with the roll mentioned in the comparative example. Perform separate operations at different drying roll temperatures, followed by high-temperature drying at 180°C in a roll oven. Specifically, individual samples of wet yarn were run through drying rolls operating at the following temperatures: 25°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, and 120°C. In other words, the first heating roller contacted by the wet yarn is 25°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, and 120°C. The total residence time on the drying roll is 4.5 minutes, and then it is passed through a connected roll oven to complete drying.

example 2

[0062] The yarn group from Example 1 and the yarn from Comparative Example A were then individually and equally heat-treated in a refractory tube oven, which was operated at a maximum temperature of 400°C. The tenacity of each yarn was then tested, and then the first roller temperature experienced by the yarn as shown in Example 1 was plotted. Then use the following formula to calculate the relative tenacity of these yarns; for convenience, the highest measured tenacity is selected as the reference tenacity:

[0063] Relative toughness=actual toughness / reference toughness

[0064] figure 2 It is a graph of the first roll temperature versus relative tenacity, and shows the higher yarn tenacity caused by controlling the initial drying temperature experienced by the yarn.

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PUM

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Abstract

The present invention concerns processes for reducing water in never-dried fiber comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6) -amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride, the process comprising the steps of: (a) heating the never-dried fiber to a temperature of at least 20° C. but less than 100 ° C. until the moisture content of the fiber is 20 weight percent or less of the fiber; and (b) further heating the fiber to a temperature of at least 350° C.

Description

Technical field [0001] This patent application relates to methods of preparing and drying copolymer fibers. Background technique [0002] The development of polymer chemistry and technology in the past few decades has initiated the development of high-performance polymer fibers. For example, liquid crystal polymer solutions of rigid rod-shaped and semi-rigid rod-shaped polymers can be prepared by spinning the liquid crystal polymer solution into dope filaments, removing the solvent from the dope filaments, washing and drying the fibers; and if necessary, further heat-treating the dried The fibers are formed into high-strength fibers. An example of a high performance polymer fiber is a para-aramid fiber such as poly(paraphenylene terephthalamide) ("PPD-T" or "PPTA"). [0003] Fiber strength is usually related to one or more polymer parameters, including composition, molecular weight, intermolecular interactions, backbone, residual solvent or water, macromolecular orientation, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/80D01D10/06D01D10/02C08G69/32C08G73/18
CPCC08G69/32D01D10/06D01F6/805D01D10/02C08G73/18C08G69/265D01F6/80
Inventor S.R.艾伦C.W.纽顿
Owner DUPONT SAFETY & CONSTR INC
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