Process for forming an aramid copolymer

A technology of polymer and p-phenylenediamine, which is applied in the field of preparing aromatic polyamide polymers, and can solve problems such as control of the position of monomer components without

Active Publication Date: 2014-04-09
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, by the conventional polymerization method, in NMP / CaCl 2 DAPBI / PPD copolymers prepared in solvent systems tend not to have control over the position of the monomer components

Method used

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  • Process for forming an aramid copolymer
  • Process for forming an aramid copolymer
  • Process for forming an aramid copolymer

Examples

Experimental program
Comparison scheme
Effect test

example

[0063] NMP, DMAC, LiCl, CaCl 2 , DAPBI, PPD and TCl were obtained from commercial sources.

example 1

[0065] Add 83.71 g of NMP / CaCl to a 1 L reactor equipped with frame stirrer, nitrogen inlet / outlet 2 Premix (8.3% by weight (salt weight / total weight of salt and solvent)), 161.65 grams of NMP (N-methyl-2-pyrrolidone], 12.282 grams (0.055 moles) of DAPBI (5(6)-amino-2 - (p-aminophenyl)benzimidazole), 4.250 g (0.023 mol) of PPD.2HCl (p-phenylenediamine dihydrochloride), and stirred at room temperature. Unlike the case of adding PPD, all solid materials Dissolve completely within 30 minutes under stirring. The clear solution is light blue. The reaction mixture is stirred and cooled to below 10° C. in an ice-water bath. At this point, 5.560 grams (0.027 moles) of TCl are added in one go and stirred under nitrogen 5 minutes. The ice water bath was removed and a second portion of TCl, 10.325 grams, was added in one portion and stirred slowly for 30 seconds, and then the stirrer speed was increased to maximum. The solution became very viscous, gelled, and eventually rubberized The ...

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Abstract

The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, comprising the steps of: a) forming a solution of DAPBI and paraphenylene diamine dihydrochloride in a solvent system comprising an organic solvent and an inorganic salt; b) cooling the solution to a temperature of 30 DEG C or less; c) adding a stoichiometric amount of terephthaloyl dichloride, relative to the total amount of the DAPBI and the paraphenylene diamine dihydrochloride, to the solution; and d) agitating the solution of step c) to form a polymer.

Description

technical field [0001] This patent application relates to a process for the preparation of aromatic polyamide polymers derived from 5(6)-amino-2-(p-aminophenyl)benzimidazole (DAPBI), p-phenylenediamine Dihydrochloride (PPD.2HCl) and terephthaloyl dichloride (TCl), capable of forming fibers with excellent physical properties. Background technique [0002] Derived from 5(6)-amino-2-(p-aminophenyl)benzimidazole (DAPBI), p-phenylenediamine (PPD) and terephthaloyl dichloride (TCl or T, also commonly known as p-phenylene Diformyl chloride) fibers are known in the art. Such copolymers are high-strength fibers made in Russia (for example, under the trade name and )Foundation. See Russian Patent Application 2,045,586. [0003] One problem with using DAPBI is that it 2 Has very poor solubility in solvent systems. In order to prepare a DAPBI / p-phenylenediamine (PPD) copolymer from a copolymer solution having a higher concentration of polymer in the solvent system (i.e., higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/32C08G73/18
CPCC08G69/06C08G73/18C08G69/00C08G69/32
Inventor K-S.李
Owner DUPONT SAFETY & CONSTR INC
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