WO2000005447A1

WO2000005447A1 - Method for high-speed false twist texturing

Info

Publication number: WO2000005447A1
Application number: PCT/EP1999/005018
Authority: WO
Inventors: Raymond Mathis; Andreas Lippmann; Norbert Bialas
Original assignee: Cognis Deutschland Gmbh
Priority date: 1998-07-24
Filing date: 1999-07-15
Publication date: 2000-02-03
Also published as: EP1117864B1; TR200003812T2; DE19833305A1; DE59905947D1; KR20010071010A; KR100618364B1; ID27446A; CN1282791C; ES2201744T3; CN1310773A; EP1117864A1

Abstract

The invention relates to a method for texturing yarns made of synthetic filaments, according to which a preparation containing at least a water-soluble lubricant (A) and a water-insoluble liquid (B) having a viscosity of between 2 and 50 mPas (20 °C, measured according to DIN 53015), and possibly emulsifiers and/or wetting agents and other additives is applied onto the yarn in the form of an aqueous emulsion, after which the filaments are subjected to texturing in accordance with the false twist principle on texturing machines having a short high-temperature heater.

Description

Procedure for high speed false wire texturing

Field of the Invention

The present application relates to a method for high-speed fish wire texturing of yarns made of synthetic filaments and to the use of a specific preparation for this texturing method.

Since the beginning of the 1980s, fine, bulky polyester yarns (PES) for applications such as clothing or upholstery fabrics have mainly been manufactured using the so-called POY spinning process (partiaily oriented yarn) followed by textured textiles.

In the case of textured wire stretch texturing, a PES-POY yarn is drawn at the same time and provided with a bulk. The bulk is created by twisting the yarn intensively in the plastic state and then dewinning again in the cooled state. The plastic state of the yarn is achieved by passing it over a contact heating rail. The twisting is mainly effected by means of friction discs made of ceramic or polyurethane (twisting unit). In the past few years, the speed of the filament wire texturing process (FT) has been steadily increased (see explanation of the basics of HK Rouette, Lexikon der Textilveredelung, 1995, pages 1524 to 1531 and 2180 to 2183). Up to the mid-1990s, speeds between 700 m / min and 900 m / min were common for standard yarns. In order to achieve these speeds, it was necessary to use very long heating rails, usually heated with diphyl (up to over 2.5 m). The cooling rails also had to be extended to over 1.5 m. The machines became correspondingly bulky and difficult to operate. At the beginning of the nineties, false-wire stretch texturing machines came onto the market that are considerably more compact thanks to the use of new heaters. The length of the thread run in these machines is significantly reduced, which causes a reduction in tension build-up and a potential for increased speeds. In contrast to traditional contact heaters, whose temperatures were between 180 and 230 ° C, the new heaters work almost contactlessly, but with temperatures up to over 500 ° C. Thanks to the very high temperatures, their length could be reduced to around 1 m. Although the mechanically achievable maximum speed of the high-temperature machine generation is usually 1500 m / min, it was found that in practice 900 to 1000 m / min are rarely exceeded can. The reason is that the game break rates are greatly excessive and occur at higher speeds. It is known that before the yarn breaks increase, an increase in yarn tension peaks can generally be observed. There was therefore an urgent need for PES-POY yarns, which could be processed on the new high-temperature heating texturing machines with a significantly reduced tendency to tension peaks and consequently to breaks.

In addition to improvements to the yarns and the spinning process, the preparations that have to be applied to the yarn during spinning and which mainly have a lubricating effect were also examined for optimization options. EP 826 816 A2, for example, describes preparations for use in false twist texturing of synthetic yarns, containing certain polyether compounds in admixture with cyclic polyorganosiloxanes in selected proportions. However, even with these preparations in practice only yarn speeds of up to 1000 m / min can be achieved, in particular because at temperatures around 350 ° C to 500 ° C polysiloxanes are degraded to hard silicate deposits on the thread guides of the high-temperature heaters thermo-oxidatively.

The object of the present invention was to provide preparations for the false-wire texturing of synthesis games which can also be used under the conditions of high-speed false-wire texturing, in particular on texturing machines with short high-temperature heaters, and substantially reduce the number of yarn breaks.

It has now surprisingly been found that the addition of a selected, water-insoluble, low-viscosity component to the lubricants known per se leads to preparations which meet the desired profile of requirements.

In a first embodiment, a method for texturing yarns from synthetic filaments is claimed, wherein the yarns contain a preparation containing at least one water-soluble lubricant (A) and a water-insoluble liquid (B) with a viscosity of 2 to 50 mPas at 20 ° C. measured according to DIN 53015, and optionally emulsifiers and / or wetting agents and other auxiliaries, is applied in the form of an aqueous emulsion and the filaments are then subjected to texturing according to the false wire principle on a machine with a short high-temperature heater. The water-insoluble component (B) is particularly notable for its viscosity behavior. Low-viscosity liquids are preferred whose viscosity is in the range from 2 to 50 mPas, but preferably in the range from 2 to 30 mPas and in particular in the range from 5 to 25 mPas, in each case measured at 20 ° C. in accordance with DIN 53015 on a Höppler viscometer. Water-insoluble components (B) with a viscosity of 5 to 10 mPas are particularly advantageous.

Such liquids are selected, for example, from the group of water-insoluble esters of fatty alcohols with 16 to 24 carbon atoms and / or polyols with 2 to 6 carbon atoms and 2 to 6 hydroxyl groups with linear or branched, saturated or unsaturated -Cε-22 fatty acids. Suitable fatty alcohols are, for example, palmityl, stearyl, arachidyl or behenyl alcohol. Suitable fatty acids are, for example, caprylic, pearlagon, capric, undecane, tridecane, myristic, pentadecane, palmitic, heptadecanoic, octadecanoic, nonanoic, arachic or behenic acid. Suitable polyols are, for example, glycol, diethylene glycol, glycerin, trimethylolpropane or pentaerythritol. The polyols can be completely or partially esterified, it is crucial that the compounds are water-insoluble and at the same time meet the viscosity criterion mentioned above. In the context of this application, water-insoluble is understood to mean compounds which dissolve at 20 ° C. to a maximum of 5% by weight, preferably to a maximum of 1% by weight. Esters from branched-chain alcohols, which are accessible, for example, via Guerbet or oxo syntheses, with fatty acids, for example esters of 2-ethylhexyl alcohol with C16-18 fatty acids, such as 2-ethylhexyl stearate, are particularly preferred. In particular, linear fatty acids of this section are preferred. In addition to these long-chain esters, methyl esters of linear or branched saturated or unsaturated fatty acids of chain length C ₈ to C22 can also be suitable liquids of type (B). Dicarboxylic acid esters such as diisooctyl sebazate, diisotridecyl sebazate and diisooctiester of azelaic acid and the water-insoluble reaction products of these compounds with ethylene oxide and / or propylene oxide can also be used as liquids (B). Water-insoluble esters of thiodipropionic acid, for example with 2-ethylhexanol, decanol or isotridecyl alcohol, and the water-insoluble reaction products of these compounds with ethylene oxide and / or propylene oxide are also suitable. The water-insoluble esters of glycol, diglycol or triglycol with C8-22 fatty acids and their alkoxides are also suitable.

Other suitable compounds for the liquids (B) are alkoxylated fatty acid esters of the formula (I) Ri-COO- (CnH _2n O) _m -R2 (I)

where R ^{1 is} a linear or branched, saturated or unsaturated alkyl radical of chain length C7 to C21, R ^{2 is} a linear or branched, saturated or unsaturated alkyl radical of chain length Ci to C12 and n is 2 or 3 and m is a number is between 1 and 10 and preferably 1 to 6. Compounds of the formula (I) in which R ^{2 is} a short-chain alkyl radical having 1 to 4 carbon atoms are particularly preferred. The alkoxylated, preferably ethoxylated or ethoxylated and propoxylated, esters can be prepared by known methods, in particular in accordance with the teaching of WO-A-90/13533. In the case of mixed alkoxides, the alkoxylation can take place in random or in block form.

Furthermore, water-insoluble, low-viscosity liquids from the class of symmetrical or unsymmetrical dialkyl ethers with preferably a total of 12 to 44 carbon atoms are suitable, for example dioctyl ether, didecyl ether or diisotridecyl ether. Dialkyl carbonates such as diisooctyl carbonate, dioctyl carbonate or diisotridecyl carbonate are also suitable liquids (B). Alkoxides of the ethers can also be used, provided they are water-insoluble and meet the viscosity criterion. In addition to these compounds, further classes of substances, in particular polyalphaolefins, for example poly-1-decenes, or mineral oils can be used as water-insoluble liquid (B) in the process according to the invention. In general, the liquid (B) can also contain a mixture of several of the liquids mentioned above.

In addition to the water-insoluble liquid (B), the preparations used in the process according to the invention contain at least one lubricant (A), which is preferably selected from the group of water-soluble reaction products of fatty alcohols with chain length C ₄ to C22 or of polyols with 2 to 6 hydroxyl groups and 2 to 6 carbon atoms with ethylene and / or propylene oxide, the reaction products having a molecular weight between 750 and 50,000. Water-soluble reaction products of glycol, ethylene and diethylene glycol or propylene glycol with ethylene and / or propylene oxide which have molecular weights in the range from 750 to 50,000 are also suitable. Ethylene oxide / propylene oxide block adducts are preferably used, it being advantageous with regard to the water solubility of the compounds that the proportion of ethylene oxide groups is at least 35% (by weight), is preferably at least 45% (by weight), based on all alkoxide groups in the molecule. Compounds from the group of water-soluble polyether polycarbonates, as described, for example, in EP-0-743 992 B1, are also suitable lubricants of type (A).

Lubricants (A) which contain several of the reaction products described above are particularly preferred. It is particularly advantageous if the preparation contains as lubricant component (A) 40 to 80% by weight of a water-soluble reaction product in the molecular weight range from 750 to 3000, 5 to 20% by weight of a water-soluble reaction product with molecular weights of> 3000 to 20,000 and a maximum of 5% by weight of a water-soluble reaction product with molecular weights of> 20,000 to 50,000. The weight specifications relate to the lubricant (A).

The preparations of the method according to the invention preferably contain the water-insoluble liquid (B) in amounts of 0.2 to 15% by weight, preferably 0.5 to 10% by weight, based on the entire preparation. The lubricant (A) can make up to 99% by weight of the preparation, but it is generally present in amounts of 30 to 90% by weight and in particular 35 to 60% by weight. In addition to components (A) and (B), the preparations also contain other optional components, in particular wetting agents and / or emulsifiers. The wetting agents are generally present in the preparations in amounts of 3 to 20% by weight and the emulsifiers in amounts of 5 to 30% by weight.

Suitable emulsifiers are all emulsifiers which can either be anionic, cationic or nonionic. The emulsifiers are preferably those which do not leave any inorganic residues at the temperatures which are customary in high-temperature texturing heaters (ie 300 ° C. to 550 ° C.). Particularly suitable are emulsifiers, which are decomposed almost without residues in classic ashing (at 900 ° C) in ceramics or platinum crucibles (below 0.2% ash). Nonionic emulsifiers are therefore particularly suitable. For example, fatty alcohol alkoxylates with molecular weights up to 800, alkoxylated fatty acids, glycols or fatty amines and alkoxylated fatty amines are suitable. All suitable compounds known to the person skilled in the art for spin finishes can be used for the wetting agents. Water-dispersible and, in particular, water-soluble substances are preferably selected. In addition to these tools, too

further conventional additives may be present in the preparations, in particular antistatic agents, thread-closing agents, pH regulators, bactericides and / or corrosion inhibitors. If necessary, these additives can be present in the preparations in customary amounts. The total amount of additives is generally up to 15% by weight, but the proportion is preferably 1 to 10% by weight.

The preparations are preferably used in the process according to the invention in the form of an aqueous emulsion which contains 1 to 20% by weight, preferably 5 to 12% by weight, of the preparation. This emulsion is applied to the game in the usual way, i.e. by means of godets (so-called lick rolls) or dosing pump and application pens, which are then subjected to a texturing process in machines with a short high-temperature heater. These are texturing processes based on the false wire principle, which can be carried out together with stretching if necessary. The claimed method is particularly suitable for such false-wire texturing units that work with almost contactless, short, high-temperature heaters. The temperature in high temperature heaters is at least in one zone 300 ° C or more. The heaters of this machine are therefore usually only a maximum of one meter long. Suitable machines of this type are offered for example by the companies ICBT (e.g. ICBT FTF15 E2 HT), Teijin Seiki (Teijin Seiki HTS 1500 or HTS 15V), Barmag (e.g. Barmag AFK) or RPR (e.g. RPR 3 SDS). High-speed processes in the sense of the present application are preferably those which work with a yarn speed of more than 600 m / min, preferably of more than 800 m / min and in particular with a yarn speed of 900 to 1500 m / min.

With the method according to the invention, the preparations are applied to the yarn in amounts between 0.25 and 0.45% by weight, based on the thread weight. The preparations are produced in a manner known per se by mixing the specified constituents in the stated amounts at temperatures between 18 and 35 ° C. in any order and homogenizing them in any known manner.

In the method according to the invention, yarns made of synthetic filaments such as polyester or polyamide are textured. These are preferably POY polyester yarns. In a further embodiment, the present invention relates to the use of compositions comprising at least one water-soluble lubricant (A) and one water-insoluble liquid (B) with a viscosity of 2 to 50 mPas measured at 20 ° C. according to DIN 53015, and, if appropriate, emulsifiers and / or wetting and other aids as preparation for the false wire texturing of yarns made of synthetic filaments on texturing machines with short high-temperature heaters. For this purpose, the agent is preferably used in the form of an aqueous emulsion which contains 1 to 20% by weight of the agent, based on the aqueous emulsion.

Examples:

In order to demonstrate the advantageous effect of the method according to the invention, the following preparations were examined: The experimental preparations consisted of a package 1 and a package 2. The package 1 was kept unchanged and consisted of the combination of a wetting agent (C12-14 fatty alcohol ethoxylate with 6 moles of ethylene oxide per Mole of fatty alcohol), a high-pressure lubricant (a water-soluble ethylene oxide / propylene oxide adduct with a molecular weight in the range from 5000 and 20,000 based on pentaerythritol), a water-soluble methyl-locked polyethylene glycol pelargonate and a C16-18 fatty alcohol-started block ethylene oxide / propylene oxide emulsifier (5 moles of ethylene oxide ( EO), 9 moles of propylene oxide (PO) per mole of fatty alcohol). Package 1 was 47% of the total preparation. Package 2, which represented 53% of the total preparation, consisted of four components:

(I) - water-soluble butanoi-started EO / PO adduct with MG ca.1000

(II) - water-soluble butanoi-started EO / PO adduct with MW ca.1700

(III) - water-soluble tetrol-started EO / PO adduct with MG approx. 7000

(IV) - 2-ethylhexyl stearate, viscosity at 20 ° C: 15 to 17 mPas.

Component (IV) represents the water-insoluble component (B) of the preparation according to the invention. Table 1 lists the compositions of the preparations examined. A combination of package 1 with lubricants (I) and (III) was investigated for reference.

Table 1 (data in% by weight):

All of the preparations listed above were applied to a typical PES-POY yarn during spinning. The circulation was 0.3%. The main spinning parameters and POY game data were as follows:

Spinning and POY yarn parameters 1:

Spinning speed 3500 m / min

Yarn type 256 dtex, 36 filaments

Strength approx.23.5 cN / tex

Elongation approx. 103%

Preparation of Barmag gear pumps and ceramic applicator

Emulsion concentration 10%

Preparation pad 0.30%

After storage for at least 24 hours, all the games were successively stretch-textured on the same 8 positions of an RPR 3 SDS HTSH machine. The texturing parameters were set as follows:

Texturing parameter 1:

Machine type RPR 3SDS

Friction unit Temco FTS 521 M

Unit configuration 1-6-1, Temco 630F 9 mm

Polyurethane worktops

Voltage limit for

Error message +/- 2 cN

Winding speed 1000 m / min

D / Y ratio 1.80

Stretch ratio 1.61

Heater temperature 500 ° C - first zone

500 ° C - second zone

Fuser heater temperature Turned off

The following measured values were determined during texturing (Table 2):

Table 2

Explanation of the abbreviations: t1: yarn tension before the texturing unit t2: yarn tension after the texturing unit t2Λ1: ratio of the two tensions

Average olt / posit .: Number of voltage limit violations during 4

Hours

S _a : standard deviation CV: coefficient of variation Surging: Speed at which the process becomes unstable

As can be seen in the results table, the process and yarn data are at a very good level. In particular, the number of tension overshoots, which are responsible for yarn breaks. significantly reduced compared to conventional preparations.

In order to verify the general validity that the addition of a water-insoluble liquid (B) to texturing preparations considerably reduces the frequency of yarn tension peaks, the following four preparations were tested on another PES-POY spinning system: reference, 13, 3 and 9.

Spinning and POY yarn parameters 2:

Spinning speed 3300 m / min

Yarn type 167 dtex 30 filaments

Preparation of Barmag gear pumps and ceramic applicator

Emulsion concentration 10%

Preparation pad 0.30%

Texturing parameter 2:

Machine type Barmag FK6 V80 with high temperature heater

Friction unit Temco Type 8

Unit configuration 1-6-1, Hokushin 9 mm polyurethane working disc

Voltage limit for

Error message +/- 3 cN

Winding speed 900 m / min

D / Y ratio 1.8

Stretch ratio 1.76

Heater temperature 380 ° C - first zone

400 ° C - second zone

Fuser heater temperature Turned off

Results:

In this case too, the advantageous effect of the method according to the invention can be seen in that there is a significant reduction in voltage peaks during the texturing process. Experiments were carried out with a further water-insoluble, low-viscosity component (B). Preparation 9 was chosen as the basic recipe (data in% by weight):

All four preparations were applied to a POY spinning system with the spinning and POY yarn parameters 2. The games were then textured on an RPR 3 SDS high temperature heater:

Texturing parameter 3:

Machine type RPR 3SDS

Friction unit Temco FTS 521 M

Unit configuration 1-6-1, Temco 630F 9 mm polyurethane working discs

Voltage limit for

Error message +/- 3 cN

Winding speed 1000 m / min

D / Y ratio 1.76

Heater temperature 500 ° C - first zone

500 ° C - second zone

Fuser heater temperature Turned off

Results:

It can be seen that a reduction in the viscosity of component (B) also reduces the number of times the tension limit is exceeded and thus the risk of yarn breakage.

Claims

claims

1. A method for texturing yarns from synthetic filaments, characterized in that a preparation containing at least one water-soluble lubricant (A) and a water-insoluble liquid (B) with a viscosity of 2 to 50 mPas at 20 ° C after measured on the yarns DIN 53015, and optionally emulsifiers and / or wetting agents and other auxiliaries, is applied in the form of an aqueous emulsion and the filaments are then subjected to texturing according to the false wire principle on a machine with a short high-temperature heater.

2. The method according to claim 1, characterized in that the preparation is a water-insoluble liquid (B) with a viscosity of 2 to 30 mPas, preferably from 5 to 25 mPas and in particular from 5 to 10 mPas, each measured at 20 ° C according to DIN 53015.

3. The method according to any one of claims 1 or 2, characterized in that the preparation contains a water-insoluble liquid (B) which is selected from water-insoluble esters of fatty alcohols with 6 to 24 C atoms and / or polyols with 2 to 6 C- Atoms and 2 to 6 hydroxyl groups with linear or branched, saturated or unsaturated fatty acids C6-22.

4. The method according to any one of claims 1 to 3, characterized in that the preparation contains a liquid (B) which is selected from the water-insoluble fatty acid esters from C16 to C18 fatty acids with 2-ethylhexyl alcohol.

5. The method according to any one of claims 1 to 4, characterized in that the preparation contains a liquid (B) which is selected from the group of water-insoluble compounds of the general formula (I)

R1-COO- (CnH2nO) mR ² (I)

where R ^{1 is} a linear or branched, saturated or unsaturated alkyl radical of chain length C7 to C21, R ^{2 is} a linear or branched, saturated or unsaturated Alkyl radical of the chain length Ci to C12 and n is the number 2 or 3 and m is a number from 1 and 10, preferably from 1 to 6.

6. The method according to any one of claims 1 to 5, characterized in that the preparation contains a liquid (B) which is selected from the group of water-insoluble dialkyl ethers, dialkyl carbonates, dicarboxylic acid esters, diesters of thiodipropionic acid, polyalphaolefins or of mineral oil.

7. The method according to claim 1 to 6, characterized in that the preparation contains at least one lubricant (A) that is selected from the group of water-soluble reaction products of fatty alcohols of chain length C ₄ to C22 or of polyols with 2 to 6 hydroxyl groups and 2nd up to 6 carbon atoms with ethylene and / or propylene oxide, the reaction products having a molecular weight of 750 to 50,000.

8. The method according to any one of claims 1 to 7, characterized in that the preparation contains a lubricant (A) that from 40 to 80 wt .-% reaction products of the molecular weight 750 to 3000, from 5 to 20 wt .-% reaction products of Molecular weight> 3000 to 20,000 and a maximum of 5 wt .-% reaction products of molecular weight from> 20,000 to 50,000.

9. The method according to any one of claims 1 to 8, characterized in that the preparation of the water-insoluble liquid (B) in amounts of 0.2 to 15 wt .-%, preferably from 0.5 to 10 wt .-%, based on contains the preparation.

10. The method according to any one of claims 1 to 9, characterized in that the preparation in addition to components (A) and (B) also emulsifiers in amounts of 5 to 30 wt .-%, and / or wetting agents in amounts of 3 to 20 % By weight, based in each case on the preparation.

11. The method according to any one of claims 1 to 10, characterized in that the preparation in the form of an aqueous emulsion which contains 1 to 20 wt .-% preferably 5 to 12 wt .-% of the preparation, based on the aqueous emulsion, is used.

12. The method according to any one of claims 1 to 11, characterized in that the preparation contains other conventional additives, such as antistatic agents, thread-locking agents, bactericides and / or corrosion inhibitors.

13. The method according to any one of claims 1 to 12, characterized in that yarns are selected from polyester filaments.

14. The method according to any one of claims 1 to 13, characterized in that the preparation is applied to the yarn in amounts between 0.25 and 0.45% by weight, based on the weight of the yarn.

15. Use of an agent containing at least one water-soluble lubricant (A) and a water-insoluble liquid (B) with a (Brookfield) viscosity of 2 to 50 mPas (20 ° C), and optionally emulsifiers and / or wetting agents and other auxiliaries , as a preparation for the false wire texturing of yarns made of synthetic filaments on textile machines with short high-temperature heaters.

16. Use according to claim 15, characterized in that the agent is used in the form of an aqueous emulsion containing 1 to 20 wt .-% of the agent.