EP0340575B1 - Waterfree composition for lubricating sewing yarns - Google Patents

Description

The invention relates to an anhydrous preparation for preparing sewing threads and sewing threads, containing organopolysiloxanes.

It is known from the prior art to use preparations which contain organopolysiloxanes as slip-improving substances for the preparation of sewing threads and sewing threads. In general, the organopolysiloxanes are used in a mixture with other substances, since the usual linear dimethylpolysiloxanes alone have inadequate sewing properties. In particular, the load-bearing capacity of the organopolysiloxanes is too low. The anti-electrostatic properties cannot be satisfactory either. Therefore, other active ingredients are added to the organopolysiloxanes in order to improve the properties of such preparations.

Mixtures with other lubricant components, e.g. with waxes, antistatic agents, anti-corrosion agents, are only stable for a short time because of the limited miscibility of these compounds with organopolysiloxanes or must be in the form of aqueous preparations, e.g. as emulsions.

je Molekül enthält, wobei X gleiche oder verschiedene Glieder der Gruppe

darstellt, wobei R′ Wasserstoff ist oder die gleiche Bedeutung wie R hat und R˝ 1 einen zweiwertigen aliphatischen Kohlenwasserstoffrest mit 1 bis 8 Kohlenstoffatomen bedeutet, Ar gleiche oder verschiedene zweiwertige, gegebenenfalls substituierte aromatische Kohlenwasserstoffreste bedeutet und a jeweils 0 oder 1 ist, mindestens einer antielektrostatisch machenden Phosphorverbindung und gegebenenfalls weiteren Stoffen, einschließlich Paraffinwachs, bestehen, und ist dadurch gekennzeichnet, daß sie mindestens eine Verbindung der Formel $${\text{O=P[(OCHR¹CHR¹)}}_{\text{n}}\text{OR² ]₃}$$

enthalten, wobei R¹ jeweils ein Wasserstoff oder die Methylgruppe bedeutet, mit der Maßgabe, daß in jeder -OCHR¹CHR¹-Einheit mindestens ein R¹ Wasserstoff ist, R² jeweils Wasserstoff oder einen einwertigen Kohlenwasserstoffrest mit 1 bis 20 Kohlenstoffatomen und n 0 oder eine ganze Zahl von 1 bis 15 bedeutet, mit der Maßgabe, daß n mindestens 1 ist, wenn R² Wasserstoff ist und in jeder der Phosphorverbindung mindestens eine -OCHR¹CHR¹-Einheit vorhanden ist.When preparing in the open godets, however, such aqueous preparations quickly lose water through evaporation. The active ingredients build up on the device parts and lead to heavy soiling and uneven preparation conditions. Such aqueous preparations also have the disadvantage of increased Corrosiveness. EP-A 0 056 095 may be mentioned in relation to this prior art. It relates to an agent for increasing the lubricity of organic fibers, these agents consisting of at least one organosilicon compound which has at least one OSiR₂ unit, where R is the same or different, optionally substituted hydrocarbon radicals having 1 to 10 carbon atoms, and at least one grouping $${\text{-X}}_{\text{a}}{\text{ArX}}_{\text{a}}\text{Ar-}$$

per molecule, where X is the same or different members of the group

represents, where R 'is hydrogen or has the same meaning as R and R˝ 1 is a divalent aliphatic hydrocarbon radical having 1 to 8 carbon atoms, Ar is the same or different divalent, optionally substituted aromatic hydrocarbon radicals and a is 0 or 1, at least one anti-electrostatic phosphorus compound and optionally other substances, including paraffin wax, and is characterized in that it has at least one compound of the formula $${\text{O = P [(OCHR¹CHR¹)}}_{\text{n}}\text{OR²] ₃}$$

contain, wherein R¹ each represents a hydrogen or the methyl group, with the proviso that in each -OCHR¹CHR¹ unit at least one R¹ is hydrogen, R² each is hydrogen or a monovalent hydrocarbon radical having 1 to 20 carbon atoms and n represents 0 or an integer from 1 to 15, with the proviso that n is at least 1 when R² is hydrogen and there is at least one -OCHR¹CHR¹ unit in each of the phosphorus compounds.

However, these agents impart insufficient lubricity to the yarns and twists, so that the thread tension is too high. This can also be seen in the so-called stick-slip test. In this test, a thread is drawn off via the thread guide and braking elements of a sewing machine at a given thread tension and take-off speed, and the amplitude of the thread tension is measured, which should be as low as possible with good preparation.

• a) 5 bis 80 Gew.-% Siliconöl einer Viskosität von 500 bis 50 000 mm²s⁻¹ bei 25°C,
• b) 10 bis 80 Gew.-% Wachs mit einem Schmelzpunkt ≧ 40°C,
• c) 1 bis 10 Gew.-% Fettsäuren mit 6 bis 22 Kohlenstoffatomen, die gesättigt, verzweigt oder substituiert sein können oder Doppelbindungen aufweisen,
• d) 0,4 bis 12 Gew.-% kationaktive Imidazoliniumsalze,
• e) 0 bis 10 Gew.-% ethoxylierte Fettamine,

wobei die Summe der Bestandteile a) bis e) 100 Gew.-% ergeben muß, in Wasser dispergiert oder gelöst enthält.EP-A 0 063 311 is named to represent water-containing preparations. This patent describes an agent containing silicone oil and wax for the substantial preparation of yarns or twists in the form of an oil / water dispersion, which

• a) 5 to 80 wt .-% silicone oil with a viscosity of 500 to 50 000 mm²s⁻¹ at 25 ° C,
• b) 10 to 80% by weight of wax with a melting point ≧ 40 ° C.,
• c) 1 to 10% by weight of fatty acids with 6 to 22 carbon atoms, which can be saturated, branched or substituted or have double bonds,
• d) 0.4 to 12% by weight of cationic imidazolinium salts,
• e) 0 to 10% by weight of ethoxylated fatty amines,

the sum of the components a) to e) must be 100% by weight, dispersed or dissolved in water.

The object of the present invention is to find water-free preparations which are simple to produce and are to have unlimited storage stability. The viscosity of the preparations should also remain constant over a longer storage period. The preparations should not have a corrosive effect if possible. Their sewing properties should at least be comparable to the properties of aqueous lubricant formulations. Surprisingly, this is peculiar to find the shaft profile in a preparation which is characterized according to the invention in that it consists of
65 to 99 wt .-% of a dimethylpolysiloxane with a viscosity of 50 to 10,000 mm²s⁻¹ at 25 ° C and a hydroxyl content of 0.3 to 1.5 wt .-% and
1 to 30 wt .-% of a fatty acid or a fatty amine with an average of 8 to 18 carbon atoms and optionally
0 to 5% by weight of conventional additives
consists.

The preparation according to the invention preferably consists of
90 to 99% by weight of a dimethylpolysiloxane of the definition given in claim 1 and
1 to 5 wt .-% of a fatty acid or a fatty amine of the definition given in claim 1 and optionally
0 to 5% by weight of conventional additives.

The dimethylpolysiloxanes contained in the preparation should have a viscosity of 50 to 10,000 mm²s⁻¹ and a hydroxyl content of 0.3 to 1.5% by weight, preferably a hydroxyl content of 0.4 to 0.8% by weight, to have.

A second component contains a fatty acid or a fatty amine with an average of 8 to 18 carbon atoms in the preparation according to the invention. Fatty acid or fatty amines with an average of 8 to 16 carbon atoms, in particular 10 to 14 carbon atoms, are particularly preferred. The saturated fatty acid and fatty amines are preferred. Hardened coconut fatty acid or hardened coconut fatty amine is particularly suitable. Mixtures of natural fatty acids or mixtures of fatty amines are generally preferred over the pure compounds. As a C₁₈ fatty acid isostearic acid is preferred to stearic acid because of its better compatibility. However, stearic acid behaves better in terms of sewing properties. The solubility of the fatty acid or fatty amine increases with increasing number of carbon from. However, since the solubility of these compounds in organopolysiloxanes improves with increasing temperature, it is advisable to prepare preparations according to the invention which contain a fatty acid or a fatty amine having 16 or more carbon atoms at a higher temperature, for example at a temperature of 40 to 50 ° C. to be used as so-called hot melts.

The preparation according to the invention can optionally also contain conventional additives, such as ester oils or organic phosphates. Examples of suitable ester oils are the pelargonic acid esters of trimethylolpropane or pentaerythritol and fatty acid esters of lower alcohols, such as butyl stearate.

Examples of suitable phosphates are the optionally partial esters of phosphoric acid with aliphatic alcohols having 1 to 20 carbon atoms and the phosphoric acid esters of alkoxylated, especially ethoxylated, aliphatic alcohols and alkylphenols, especially nonylphenol.

The preparations according to the invention are produced by simple mixing, if appropriate at elevated temperature. In the following examples, different preparations according to the invention are compared with products of the prior art with regard to their sewing properties.

First 5 preparations are produced, the composition of which can be seen in the following table.

The individual components of the preparations are mixed at a temperature of 45 ° C and stirred until a clear solution. The preparations are then cooled to room temperature. Preparations 6 and 7 serve as a comparison.

Preparation 6 35 parts by weight of a trimethylsilyl-terminated hydroxyl-free dimethylpolysiloxane with a viscosity of 1000 mm²s⁻¹ are mixed with 10 parts by weight of paraffin wax with a melting point of 52 mixed up to 54 ° C and heated to 90 ° C. 3 g of an ethoxylated coconut fatty amine with an HLB value of 12 are distributed in the melt obtained as an emulsifier. 53 parts by weight of 90 ° C. hot water are stirred into the resulting oily phase. The emulsion obtained is allowed to cool with slow stirring. Preparation 7

Preparation 7 corresponds to the preparation according to Example 2 of EP-A 0 056 095.

Application test

For the experiments, a PES triple twine of the NXm 100/3 made of tear cable was provided with preparation agents on a godet.

A) Print run in%

The circulation of the preparation on the thread was determined by differential weighing of treated and untreated sewing thread.

B) Thread tension

The thread tension was determined with a thread tension measuring device from Schmidt & Co. KG, Waldkraiburg, type DXX.

C) Sewing test

The treated test thread (as the upper thread) is used to sew 12, 14 or 16 layers of cotton cretone three times at maximum sewing speed until the thread breaks. The strength of the sewing needle to be used depends on the titer of the test thread.

If an average seam distance of more than 40 cm is reached, the test is repeated with a number of layers increased by two. If, on the other hand, the mean seam distance reached is less than 10 cm, the test is repeated with a number of layers reduced by two.

The result is given as the mean seam distance achieved in cm, stating the needle size used.

D) stick-slip

The stick slip is measured according to the following rule:

Test equipment:

Industrial sewing machine, Rothschild F-meter and take-off device with measuring head 400 g, recorder

Execution:

• a) Gerät einschalten; da eine Anheizzeit von mindestens 1 h notwendig ist, empfiehlt es sich, das F-Meter ständig eingeschaltet zu lassen.
• b) Nullpunkt t₁ und t₂ einstellen.
• c) Betriebsartenschalter auf F und Eichen stellen.
• d) Eichgewicht über den Meßkopf t₁ hängen, wobei darauf zu achten ist, daß der Faden den Reibkörper und den unteren Führungsstift des Meßkopfes tangiert. Mit dem Eichknopf den dem Gewicht entsprechenden Eichwert t₁ einstellen.
• e) Übereinstimmung zwischen F-Meter-Anzeige und Schreiber überprüfen, gegebenenfalls korrigieren.

Before starting each measurement, all thread guide elements, brakes and the measuring head must be carefully cleaned with ethanol. The Rothschild device is then calibrated as follows:

• a) switch on the device; Since a heating-up time of at least 1 hour is necessary, it is advisable to keep the F-Meter switched on at all times.
• b) Set zero point t₁ and t₂.
• c) Set operating mode switch to F and oak.
• d) Hang calibration weight over the measuring head t₁, taking care that the thread touches the friction body and the lower guide pin of the measuring head. Use the calibration button to set the calibration value t₁ corresponding to the weight.
• e) Check the correspondence between the F-meter display and the recorder, correct if necessary.

For the measurement, the calibration thread (Gütermann T 353) is first drawn off from the bobbin via the thread guide and braking elements of a sewing machine and via the measuring head t 1 at 6 m / min, by changing the thread brake a thread tension of 130 g is adjusted.

After cleaning the thread guide organs, the brake and the measuring head with ethanol, the test thread is drawn off at 2, 6 or 14 m / min over the same arrangement and the thread tension t 1 is registered on the recorder.

The transcript is evaluated with regard to the mean difference between the minimum and maximum value of the thread tension, the stick-slip behavior being assessed in accordance with the following table:

From the table it can be seen that the preparations according to the invention have both low thread tension as well as reduced thread breakage and improved stick-slip with one another.

Claims (3)

1. Anhydrous preparation for lubricating sewing yarns and threads, containing organopolysiloxanes, characterised in that it consists of

65 to 99 % by weight   of a dimethylpolysiloxane having a viscosity of 50 to 10,000 mm²s⁻¹ at 25°C and a hydroxyl content of 0.3 to 1.5 % by weight and

1 to 30 % by weight   of a fatty acid or amine having on average 8 to 18 carbon atoms and optionally

0 to 5 % by weight   by weight of customary additives.

2. Preparation according to Claim 1, characterised in that it consists of

90 to 99 % by weight   of a dimethylpolysiloxane of the type defined in Claim 1 and

1 to 5 % by weight   of a fatty acid or amine of the type defined in Claim 1 and optionally

0 to 5 % by weight   of customary additives.

3. Preparation according to Claim 1 or 2, characterised in that it contains a dimethylpolysiloxane having a hydroxyl content of 0.4 to 0.8 % by weight.