DD260405A3 - PROCESS FOR PRAEPING SYNTHETIC FAEDES - Google Patents

Abstract

The invention relates to a process for the preparation of synthetic fibers, in particular of polyethylene terephthalate synthetic fibers produced by the melt spinning process. The aim and the object is to treat the synthetic threads with a preparation prepared in water in order to achieve a good thread closure, better friction between the threads with each other and to the thread guide elements and to improve the drawing process, wherein the preparation does not depend on the Faseroberflaeche after drawing must be washed off. According to the invention, the melt-spun synthetic fibers are treated with a preparation formulation whose concentration is 0.2 to 2.0% by weight and the support on the casings is 10 to 30% by weight. Subsequently, the usual further treatment is carried out, but the concentration ratio Spinn- / Streckpraeparation 3: 1 to 1: 1 entrains.

Description

25-50% by weight of a compound of the general formula

0 ii

(II) CH ₃ - (CH _{2) z} -CO (CH ₂ - CH ₂ - 0) - H

10-30% by weight of a compound of the general formula

0 0

/ I /

(III) CH, - (CHJ ₁₇ - C - O - (CH ₉ - CH ₉ - O) ₁ - C - (CH ₀ ) - CH ,,

wherein the overlay of the preparation liquor on the spun fiber is 10 to 30% by weight, with subsequent drawing of the filaments in heated baths with the same preparation formulation, wherein the concentration ratio of the spin / draw preparation is 3: 1 to 1: 1, characterized in that the preparation fleet

5-15% by weight of a compound of the general formula

9H - "" H.

I / I / Cb θ

(IV) CH, - (CH _{9) Tr} -CO-- Ii - GH - CH ₀ - H - H CH, - SO,

1 - <L V I CH- OH contains, where R ₁ = R ₂ = H , CH ₃ or (CH ₂ -CH ₂ -O) _n -H m = 12-18 η = 1-6 χ = 6-18 y = 2-15 Z = 6-18 U = 2-20 V = 10-16 mean.

Field of application of the invention

The invention relates to a process for the preparation of synthetic yarns based on polyethylene terephthalate, especially those produced by the melt spinning process.

Characteristic of the known technical solutions

It is known that synthetic threads based on polyethylene terephthalate produced by the melt spinning process have a very high fiber-to-fiber friction and fiber-to-metal friction.

To ensure trouble-free further processing, it is therefore necessary to equip these threads with a friction-reducing preparation. This preparation is also intended to prevent electrostatic charging, ensure the combined following the spinning process yarn sheet a good cohesion, make the threads in the subsequent post-treatment process lubricious and thus actively support the drawing process.

Numerous preparations have already been described which are said to improve the processing properties of synthetic fibers. All demands made of a preparation, however, are hardly met by a chemically unified substance. Therefore, it is in practice mostly combinations of lubricants, emulsifiers and wetting agents, antistatic agents, Hygroskopica, thread closing agents, etc. (H.Ludwig, polyester fiber chemistry and technology, Akademie-Verlag Berlin, 1975, pp 275-278). So z. B. brought in accordance with DE-AS 1004768 a low-viscosity lubricating oil with fatty alcohol-ethylene oxide condensation products in emulsion and added fatty acid esters. From DE-AS 2659705 a Spinnpräparationskomposition is known which consists of a mineral oil, a primary or secondary alcohol having at least 8C atoms, a monoalkyl or dialkyl ester of phosphoric acid or a mixture of such esters, a primary, secondary or tertiary amine and optionally water is composed. However, the compositions mentioned have the disadvantage that they must be washed out again because of the friction-enhancing effect after drawing or are only suitable for special processing and application areas.

DD-PS 200094 describes the use of an oxyethylenated fatty acid monoester and diester mixture in combination with polyethylene glycol and an antistatic agent for producing fibers having a defined crimping characteristic and special fields of use.

Furthermore, the combination of oxyethylated fatty acids with alkylphosphoric acid esters is known, with which good processing properties of the polyester fibers are achieved, but the cable closure of the spinning material is not satisfactory (Kleber, Melliand Textilberichte, 10, [1980], pp. 831-832).

DD-PS 77041 describes the use of unsaturated or saturated alkyl betaines as antistatic agents for PAN fibers in the gel-moist state. Highest demands on the spider cable closure are not necessary in this process (wet spinning), since the material is processed continuously without intermediate storage.

Object of the invention

The object of the invention is to achieve a good thread closure, better friction conditions between the threads with each other and to the Fadenleitorganen and to improve the drawing process in the produced by the melt spinning process synthetic threads of polyethylene terephthalate, wherein the preparation is not washed off after stretching from the fiber surface got to.

Explanation of the essence of the invention

The invention has for its object to be prepared by the conventional melt spinning process or chemically modified synthetic threads made of polyethylene terephthalate with a prepared in water formulation preparation that gives the filaments with each other good adhesion, which ensures low fiber-metal friction in all processing stages and which does not have to be washed off the surface of the thread either before or after drawing.

According to the invention, the melt-spun polyethylene terephthalate synthesis threads are prepared immediately after emerging from the spinning shaft with an aqueous 0.2-2 wt .-% preparation formulation of the composition 25-60Gew .-% of a saturated alkylbetaine compound of the general formula

•θ e

OH- (CH ₂ ) In -CH ₂ -K-CH ₂ -COO

R ₂

25-50Gew .-% of an oxyethylated fatty acid monoester compound of the general formula

.0 CH ₃ - (CH ₂ ) _x -CO- (CH ₂ - CH ₂ - O) - H

10-30% by weight of an oxyethylated fatty acid diester compound of the general formula

ο o

_U CH ₃ - (CH _{2) Z} - C - 0 - (0 CH ₂ - - CH ₂₎ - C - (CHg) ₂ - CH _3,

wherein the circulation of the preparation liquor on the spun fiber is 10-30 wt .-%, with subsequent stretching of the threads in heated baths with the same preparation formulation, wherein the concentration ratio of the spin / plug preparation is 3: 1 to 1: 1, and the preparation liquor 5-15% by weight of a quaternized fatty acid amide compound of the general formula

- (GH ₀ ).

O if

-C-

H O - Κ -

GH - CH, OH

-N-H- CH., -

contains, where

R ₁ = R ₂ = H, CH 3 order (CH ₂ -CH ₂ -O) n H - ·

m = 12-18

η = 1-6

χ = 6-18

y = 2-15

ζ = 6-18

u = 2-20

ν = 10-16.

The so-equipped threads of a spinning line are summarized and stored in pitchers. For the subsequent aftertreatment process, the spinning cans are combined to a total cable thickness of 60 to lOOktex and under

Use of heated baths stretched.

The draw preparation corresponds in composition to the individual components of the

Spin finish.

When using the preparation formulation according to the invention, a good thread slip is achieved, and the individual tow cables can be removed from the cans to a large extent without interference. The winding formation in the region of the drawing, the cause of which are individual capillary breaks, is due to the favorable thread / thread and thread / metal friction

other preparations significantly reduced.

After drawing, the group of threads is usually subjected to a thermofixing process, with a finishing preparation

treated, curled and dried.

The good processing properties of the fiber material in the textilien further processing do not require washing out of the spinning / stretch preparation during the post-treatment process.

embodiments Examples 1

(Comparative Example)

A group of threads consisting of 1300 filaments of polyethylene terephthalate with a Einzelfaserendtiterv of 0.16tex was immediately after leaving the spinning shaft by means of two preparation rolls with a 0.8% aqueous liquor consisting of an oxyethylated fatty acid mono- and diester mixture according to DD-PS 200094 and a C ₈ -Alkylphosphorsäureester in the component ratio 85:15, prepared. The circulation of the preparation liquor on the fiber was

26.4%.

18 of the spun yarn sheets thus equipped were collected via deflection godets and deposited in cans. The

Can fill weight averaged 398kg.

Following the spinning process 2 χ 22 cans were folded together, withdrawn together from the cans and stretched in heated baths. The stretch preparation corresponded in composition to the spin finish, the concentration was 0.30%. The insufficient cable closure led to the spreading of filaments or filament bundle that stuck in the eyelets and Umlenkorganen the gate and resulted in disturbances in the compartment (1.20 specialist space disorders / t fiber), combined with road stoppages resulted. Due to the insufficient dynamic fiber / metal friction, capital developers (1.41 reel formations / t fiber) were increasingly hit on the drawing godets; their removal was also accompanied by road stoppages, combined with a loss of capacity and quality.

were required.

Prior art (comparative example)

inventive solution

composition 85% oxethylated fatty acid 31% unsaturated alkyl betaine (I) mono-u. -diestergemisch 36% Oxyethylated fatty acid mono ester (II) 18% oxyethylated fatty acid di ester (111) 15% C ₈ -Alkylphosphorsäure- 15% quaternized fatty acid ester amide (IV) Concentration of spin fleet 0.8% 0.9% fleet edition 26.4% 18.9% Kannenfüllgewicht 398 kg 470 kg Drawer space interference / t-fiber 1.20 0.76 Winding formations / t Fiber 1.41 1.01 spez.elektr. substance 9.8-10 ^a ocm 6.4-10 ⁷ Ωcm resistance of the fiber

Example 2

A bundle of spun threads consisting of 1300 polyethylene terephthalate filaments with a single fiber titer of 0.16tex was treated immediately after leaving the spinning shaft by means of two preparation rollers with a preparation formulation of the following composition: 34% by weight of the compound

(I) GH ₃ - (CH ₂ ) ₁₆ - GH ₂ - Ή - CH ₂ - GOO

39% by weight of the compound

(II) CH ₃ - (CH _{2) 13} -CO- (CH ₂ - CH ₂ - 0) _Q - H

22% by weight of the compound

0 0

(III) CH ₃ - (CHg) ₁₂ - C - 0 (GH ₂ - CH ₂ - O) ₆ - π -

5% by weight of the compound

ö H H ^ / -)

i) r\ ® ^ö

(IV) CH _Q - (CH _{0) 4} ο - C - 0 - N - CH - CH ₀ - Έ - H CH ₀ - SO,

OH CH ₃

The concentration of the aqueous preparation formulation was 0.9%. The circulation of the preparation liquor on the spinning material was 22.3%.

Twenty-five filament bundles equipped with the preparation according to the invention were combined via deflection godets and deposited in spinning cans. As a result of the excellent spider cable closure, 15% more spinning material could be deposited in the cans compared to the spin finish composition described in DD-PS 200094. Following the spinning process, 2 x 22 cans were folded together and stretched together in heated baths.

The stretch preparation corresponded in composition to the spin finish, the concentration was 0.35%.

Post-treatment of the spun material registered 37% less interference from the shed and drawdown lap could be reduced by 23% due to the improved fiber / fiber and fiber / metal friction ratios, resulting in a reduction in the proportion of low quality fibers Yield yield was 26%.

It was not necessary to wash out the spin finish after the draw process.

The usually aftertreated filaments were cut into fibers of 38 mm in length and showed good running properties in the textil further processing on the card, track and ring spinning machine.

Example 3

A filament bundle consisting of 195 filaments of carbon black pigmented polyethylene terephthalate having a single fiber titer of 1.7tex was treated with a preparation formulation according to Example 2, with the preparation roll speed set so that the preparation bath pad was 18%.

Twenty-five filament bundles equipped with the preparation according to the invention were combined via deflection godets and deposited in spinning cans. A total of 2 χ 14 sliver cans were put together to form a batch and stretched in heated baths.

The draw preparation corresponded in composition to the spin finish, the concentration was 0.4%.

Despite the high individual fiber titer, the spinning material was easy to remove from the cans and stretched largely without disruption.

The cable cut to fibers of 90mm length could be processed with high productivity to textile floor coverings. If the preparation formulation according to the invention is dispensed with (see Example 2), the proportion of compartmental disturbances is increased by 57%, and the formation of coils in the area of stretching increases by 39%. As a result of this deterioration in the aftertreatment process, the proportion of minimum quality fibers increases by 42%.

Example 4

A strand of spun yarn was spun, prepared, stretched, post-treated and processed according to Example 2, the preparation component I having the following composition:

Ι © θ.

(I) CH, - (CHp) ₁₆ - CHp --N - CH ₂ - COO

^J ^ (CH ₂ -CH ₂ -O) ₃ -H

The concentration of the aqueous preparation was 0.6%, the preparation fleece overlay on the spinning material 21.4% and the concentration of the draw preparation 0.3%.

Even the so finished threads showed a good cable termination, could stretch easily and ensure a textile finishing with high productivity and quality of the final products.

With regard to the aftertreatment procedure and the quality yields, the advantages described in Example 2 were also achieved with this preparation formulation. It was also not necessary to wash out the spin finish after the draw process.

Example 5

A filament bundle consisting of 195 filaments of carbon black pigmented polyethylene terephthalate having a single fiber terminator of 1.7 tex was treated with a preparation formulation according to Example 2 but with the component ratio varied as follows:

31% compound I 36% compound II 18% compound III 15% compound IV,

the preparation roller speed was adjusted so that the preparation bath pad was 18.9%. The further treatment of the spinning material was carried out according to Example 3. Despite the comparison fleece coating reduced compared to the comparative example, significantly better results could be achieved with regard to the cable termination (can filling weight, can outlet) and the aftertreatment process (formation of a coil), which is shown in tabular form in the comparative example.

Claims (1)

Process for preparing synthetic threads of polyethylene terephthalate after melt spinning with an aqueous 0.2-2% by weight preparation formulation of the composition 25-60% by weight of a compound of the general formula ιW θ (I) CH-. - (CH ₉ ) - CH ₉ -N-CH ₉ - COO ^ J 4mmXII^ m I -W