DD286001A5 - METHOD FOR PRODUCING A POLYMER SOLUTION - Google Patents

Abstract

The invention relates to a process for the preparation of a polymer solution of cellulose, amine oxide, water and stabilizer, which can be processed in the chemical fiber and film industry to gleichmaeszigen Regeneratfaeden and films of high fineness. The polymer solution consists of 5-20 parts by weight of cellulose in%, 95-80 parts by weight of amine oxide in% with 10-18 parts by weight of water in%, * parts by weight of stabilizer in% based on cellulose and contains 0.05-5.0 parts by weight of a surface-active substance according to the invention in% based on cellulose. As surface-active substances (surfactants) ethoxylated amines are used {Polymer solution; cellulose; amine oxide; Stabilizer; surface-active substances; surfactants; ethoxylated amines; Regeneratfaeden; Regeneratfolien}

Description

Field of application of the invention

The invention relates to a process for preparing a Polymerlö young from cellulose, amine oxide, water and stabilizer, which is processed in the chemical fiber and film industry to cellulose regenerated pulps and films.

Characteristic of the known state of the art

It is known to prepare polymer solutions consisting of cellulose, aminoxides and water and to process cellulose regenerated threads and films. (OE-OS 2830683/84/85, DE-OS 284847Ί, DE-OS 2913589, DE-OS 3021043) It is also known to stabilize the Polymorlösungen of cellulose by additives, such as propyl gallate, substituted phenols, against polymer degradation. (DE-OS 3034685, EP 0047929, DD-PS 229708) The above-average viscoelastic properties of the polymer solution as well as their relatively high interfacial tensions limit their spinnability, i.e. the filament formation is limited in terms of uniformity and fineness. (See, Navard, P., and Haudin, I., Polymer Process Eng. 3 [1985], pp. 291-301)

Improvements, especially in terms of achievable fineness are achieved by spinning the polymer solution at very low shear rates and long residence times in the nozzle channel. This results in a reduction in throughput per spinneret.

Object of the invention

The object of the invention is a simple process for the preparation and spinning of polymer solutions of cellulose, amine oxides, water and stabilizer to uniform cellulose regenerate yarns of high fineness.

Explanation of the essence of the invention

The object of the invention is to spew cellulose regenerated yarns with substantially higher uniformity and fineness while eliminating the said defects. According to the invention, this is achieved by adding a polymer solution consisting of 5-20% by weight of cellulose in%, 95-80% by weight of amine oxide in% with 10-18% by weight of water in%, 0.1-1.0% by weight of stabilizer in% based on cellulose and 0.05-5.0 parts by mass of a surfactant (tonsides), based on cellulose, deformed by a spinneret to the yarn sheet, the threads oriented and then regenerates the cellulose in water or aqueous amine oxide solutions.

By addition of the surfactant, preferably an ethoxylated amine, the interfacial tension of the polymer solution is greatly reduced, prevents cohesive failure of the filaments in DuiSnkapillaraustritt and thus increases the spinnability. As the amine oxide, N-methylmorpholine N-oxide can be used.

Ausführungsbelsplele The invention will be explained below by way of examples: example 1

A homogeneous mixture of 10.0 parts by weight of cellulose (DP 400) in%, 90.0 parts by weight of N-methylmorpholine N-oxide in% with 14.4 parts by weight of water in%, 0.4 parts by weight of stabilizer 1.2 g of di-tert. butyl-p-cresol in%, based on cellulose and 0.1 parts by weight ethoxyliertos AmIn (Präwozell N9) in%, based on cellulose, is fed to a twin-screw extruder, melted, degassed, filtered and through a nozzle with 60 spinning capillaries at 368K to a Filament bundle deformed. After being deflated in an air gap, the filament bundle passes through a spinning bath at 60 m / min and is then cut into 38-mm stacks, washed, finished and dried.

fiber parameters Fineness 0,15tex Tear tension 290mN / tex Elongation at break 14% Example 2

A homogeneous mixture with 1.0 part by weight of ethoxylated amine (PrSwozell P 76/1) in% is processed analogously to Example 1 at a take-off speed of 80 m / min.

Fajerparat tar 0,12tex fineness 350mN / tex breaking stress 13% elongation at break

example

A mixture of 12.5 parts by weight of cellulose (DP-350) in%, 87.5 parts by weight of N-methylmorpholine N-oxide in% with 13.1 parts by weight of water in%, 0.2 parts by weight of stabilizer [gallic acid propyl ester] in% on cellulose, with 0.5 parts by weight ethoxylated amine (Präwozell N9) in%, based on cellulose, is added to a stirred vessel, stirred for one hour at 363K under vacuum (13KPa) until complete dissolution and then via spin pump, filter and spinneret ( 36 capillaries) to the bundle of fibers deformed. There is a stretching of the filaments in the air gap, regeneration of the cellulose, removal of the solvent, softening, drying and winding of the multifilament yarn.

Fadenparbmeter

Fineness 12tex (36)

Tension 2S0mN / tex

Elongation at break 20%

Claims (2)

1. A process for the preparation of a polymer solution of cellulose, amine oxide, water and stabilizer by extrusion of a homogeneous mixture consisting of 5-20 mass% cellulose, 95-80 mass% amine oxide in% with 10-18 mass% water and 0.1 % By weight of stabilizer in%, based on cellulose, characterized in that the homogeneous mixture simultaneously contains 0.05-5.0 parts by mass of surfactant in%, based on cellulose. 2. The method according to claim 1, characterized in that a nonionic ethoxylated amine is used as the surfactant.