DE102010015499B4 - Additive for friction reduction and antistatic melt-spinnable polymers - Google Patents

Abstract

A masterbatch consisting of 5.0 wt% to 15.0 wt% of a calcium carbonate, and 0.1 wt% to 0.5 wt% of a phosphitic co-stabilizer, and 10.0 wt. % to 20.0% by weight of fatty acid amides mixed into a melt-spinnable polymer to give 100% by weight.

Description

Technical area

The invention describes an additive to melt-spinnable polymers, which reduces the static friction and sliding friction between polymer and surrounding materials. Further, the additive increases the electrical conductivity and prevents static electricity.

State of the art

Plastics usually have electrical insulating properties. Many people are familiar with the phenomenon of charge separation when putting on or taking off a pullover or shirt made of synthetic material. In the dark you can see sparks skip. If no charge compensation takes place on the shoes, the charge compensation takes place as a light electric shock when gripped to a grounded conductor, z. B. a door handle.

This property is perceived as unpleasant and is undesirable. For plastics used in engineering applications, electrostatic charging is often undesirable or even dangerous to use.

Therefore, many efforts are made to provide plastics at least partially conductive, so that electrostatic charges can be avoided. Common methods for this purpose are, for example, the incorporation of conductive carbon black, the metallization of surfaces by means of vapor deposition / sputtering in a vacuum, installation of metal filaments in injection-molded bodies or textile surfaces.

Another problem is the friction of the plastic surfaces with the environment. This includes both the friction of the plastic body itself with its neighbors - in the case of synthetic threads, the thread-thread friction - as well as the friction between plastic body and surrounding materials; with synthetic threads this is often the thread metal or the thread ceramic friction. The average subject is known that z. As the thread-thread friction - in particular the stiction - can be so large that it comes to yarn breakage and the processing process must be interrupted.

In general, this problem is attempted by dissecting the surfaces with textile auxiliaries. Modern Spinfinishes have the task to adjust the friction properly and also to provide the necessary degree of antistatic. Disadvantage: The preparations are applied later, usually in the form of an aqueous emulsion, and can easily be washed off again. Especially in textiles, the effect is mostly lost in the equipment of the fabrics.

Another possible solution would be the incorporation of fatty acid or oleic acid amides in the polymer matrix. Fatty acid amides are waxes based on long carbon molecular chains. They slowly migrate to the surface where they form a long-term film with good sliding properties and high long-term temperature resistance of up to 220 ° C. Due to the carbon chains, fatty acid amides have improved electrical conductivity.

It is known to those skilled in the art that the incorporation of conventional fatty acid amides in polyester is difficult and is. Also, fatty acid amides in polymers tend to migrate immediately. In synthetic threads, this leads to deposits on the take-off rolls during processing. Another disadvantage is that the active ingredient is washed off during washing or rinsing from the surface of the finished finished part and thus loses its effectiveness.

The object of this invention is to permanently equip plastics antistatic and reduce the friction or to improve the sliding properties of the plastic surfaces.

The object is achieved by a combination of fatty acid amides, calcium carbonate and a phosphite co-stabilizer, which in the polymer matrix, for. For example, a polyester can be incorporated. The masterbatch produced in this way is added to the polymer stream later in the production of plastic moldings immediately prior to extrusion in order to give the plastic moldings the desired antistatic properties and sliding properties.

• 1. 5,0 Gew.-% bis 15,0 Gew.-% eines Calciumcarbonats, z. B. von der Alpha Calcit Füllstoff GmbH&Co KG,
• 2. 0,1 Gew.-% bis 0,5 Gew.-% eines phosphitischen Co-Stabilisators, z. B. Irganox P-PEPQ der BASF, Lampertheim,
• 3. 10,0 Gew.-% bis 20,0 Gew.-% verschiedener Fettsäureamide bevorzugt Incromax PET 100 der Croda Europe, Steintor 6, 46446 Emmerich, und
• 4. ergänzend zu 100 Gew.-% aus einem Polyester als Basispolymer, z. B. Polybutylenterephtalat Type Ultradur B 2550 der BASF SE, 67059 Ludwigshafen,

The masterbatch according to the invention consists of:

• 1. 5.0 wt .-% to 15.0 wt .-% of a calcium carbonate, z. From Alpha Calcite Füllstoff GmbH & Co KG,
• 2. 0.1 wt .-% to 0.5 wt .-% of a phosphitic co-stabilizer, z. B. Irganox P-PEPQ BASF, Lampertheim,
• 3. 10.0 wt .-% to 20.0 wt .-% of various fatty acid amides preferably Incromax PET 100 from Croda Europe, Steintor 6, 46446 Emmerich, and
• 4. in addition to 100 wt .-% of a polyester as the base polymer, z. B. Polybutylene terephthalate Type Ultradur B 2550 from BASF SE, D-67059 Ludwigshafen, Germany

From this masterbatch 2.0 to 10.0 wt .-%, preferably 5.0 wt .-% are added to the product. With the special combination described one obtains synthetic fibers, which maintain their sliding properties and antistatic effect even after repeated cleaning.

The described masterbatch is sold under the name Monoslip 230310 PET by the applicant as a commercial product for the production of plastics.

Claims (5)

A masterbatch consisting of 5.0 wt% to 15.0 wt% of a calcium carbonate, and 0.1 wt% to 0.5 wt% of a phosphitic co-stabilizer, and 10.0 wt. % to 20.0% by weight of fatty acid amides mixed into a melt-spinnable polymer to give 100% by weight. A masterbatch according to claim 1, characterized in that the melt-spinnable polymer is a polyester, a polyamide, a polyolefin, a polyphenylene sulfide or a mixture of the aforementioned polymers, A masterbatch according to claims 1 and 2, characterized in that the melt-spinnable polymer is a polyester, preferably a polyethylene terephthalate, a polytrimethylene terephthalate, a polyethylene naphthalate, a polybutylene naphthalate, a thermoplastic polyether ester or more preferably a polybutylene terephthalate. The use of a masterbatch according to claims 1 to 3, characterized in that it is added to 2.0 wt .-% to 10.0 wt .-% before extrusion of a melt-spinnable polymer. The use of the masterbatch in the melt-spinnable polymer according to claim 4 in moldings, preferably in fibers and filaments.