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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 known methods such as expensive and low investment economy

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

[0063] Example: general case

[0064] 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 p-phenylenediamine and 5(6)-amino-2-(p-aminophenyl ) The mol ratio of benzimidazole and terephthaloyl dichloride is 1:1. A spinning solution of the polymer in sulfuric acid was then prepared and the filaments were spun from the air gap in the spinneret into a coagulation bath to form a copolymer yarn. The yarn consisted of 270 filaments with a linear density of 3 denier / filament. The yarn is then washed with water and hung onto bobbins. Intrinsic viscosity and percent sulfur were measured on this yarn sample. The resulting yarn had a sulfur content of 3.08% by weight and an intrinsic viscosity of 3.54 dl / g.

[0065] The yarn was then fed from the spools to a series of 10 continuous wash box m...

example 1

[0069] Several samples of wet yarn were first run through low temperature drying rolls operating at a constant surface temperature and then through a high temperature oven with the rolls mentioned in the comparative example. Each individual run was performed 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 wet yarn contacts the first heated roll at 25°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, and 120°C. The total residence time on the drying rolls was 4.5 minutes before it was passed through an attached roll oven to complete drying.

example 2

[0071] The set of yarns from Example 1 and the yarns from Comparative Example A were then each individually and equally heat treated in a refractory type tubular oven operating at a maximum temperature of 400°C. The tenacity of each yarn was then tested and then plotted against the first roll temperature experienced by the yarn as shown in Example 1. The relative tenacity of these yarns was then calculated using the following formula; for convenience, the highest measured tenacity was chosen as the benchmark tenacity:

[0072] Relative toughness = actual toughness / benchmark toughness

[0073] figure 2 is a graph of first roll temperature versus relative tenacity and shows higher yarn tenacity resulting from 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 having the following steps in a continuous process, (a) a step of drying a never-dried fiber having at least 0.1% sulfur at less than 150° C. until the moisture content of the fiber is less than 60 weight percent; and (b) a step of further drying the fiber above 150° C. while the moisture content of the fiber is no more than 60 weight percent; and the fiber being further heated to at least 350° C. in either an additional continuous or separate step.

Description

technical field [0001] This patent application relates to methods of preparing and drying copolymer fibers. Background technique [0002] Advances in polymer chemistry and technology over the past few decades have initiated the development of high performance polymer fibers. For example, a liquid crystal polymer solution of a heterocyclic rigid rod polymer 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 further heat treating the dried fibers if desired. Formed into high-strength fibers. An example of a high performance polymer fiber is a para-aramid fiber such as poly(p-phenylene 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 processing. For example, f...

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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