Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1994-01-26
1995-08-08
Green, Anthony
Coating processes
With post-treatment of coating or coating material
Heating or drying
811551, 81156, 252 86, 252 88, 252 89, 427394, 427421, B05D 500, D06M 13184
Patent
active
054397090
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the use of C.sub.8-22 fatty methyl esters as smoothing agents in lubricants for card spinning and to a process for lubricating textile fibers for the production of carded yarn. The invention also relates to lubricants containing C.sub.8-22 fatty acid methyl esters and homopolymers and/or copolymers of esters of acrylic and/or methacrylic acid having limiting viscosities [eta] below 400 ml.multidot.g.sup.-1 in quantities of 0.05 to 10% by weight, based on lubricant.
Textile fibers which are processed to carded yarns are subjected to combing before spinning to parallelize the fibers and to establish a fiber structure. The textile fibers are subjected to very severe mechanical stressing during the combing process. Accordingly, the textile fibers are treated with a lubricant containing a smoothing agent before combing in order to avoid fiber damage attributible to high friction between fibers and metal surfaces (fiber/metal friction) and to obtain optimal friction between the individual fibers (fiber/fiber friction). Lubricants contain smoothing agents to avoid fiber damage, emulsifiers to enable them to be applied as emulsions and, optionally, other additives. In many cases, lubricants containing hydrocarbons as smoothing agents are used. Since these smoothing agents are not readily biodegradable, they are being replaced to an increasing extent by readily biodegradable smoothing agents for lubricants, for example by fatty acid esters (Textil Praxis International 1984 (8), 748-758).
In addition to ready biodegradability, the smoothing agent and lubricant must show good spreading power on the fibers. Although lubricants containing isobutyl stearate or 2-ethylhexyl stearate as smoothing agents are readily biodegradable, they do not spread satisfactorily on the fibers and, hence, do not provide for optimal fiber/fiber and fiber/metal friction in the production of carded yarn.
Accordingly, the problem addressed by the present invention was to develop a lubricant for card spinning which, in addition to ready biodegradability, would have excellent spreading power on the fibers.
DESCRIPTION OF THE INVENTION
It has been found that the requirements stated above for the lubricant to be developed can be satisfied by the use of C.sub.8-22 fatty acid methyl esters as smoothing agents in lubricants.
Accordingly, the present invention relates to the use of one or more C.sub.8-22 fatty acid methyl esters as smoothing agents in lubricants for card spinning.
The fatty acid methyl esters used in accordance with the invention are commercially available products which are produced by esterification of the free fatty acid by methods known per se or by transesterification of fatty acid triglycerides with methanol, generally in the presence of acidic catalysts. Fatty acid methyl esters which have been produced by transesterification of natural triglycerides, such as coconut oil, soybean oil, rapeseed oil, sunflower oil, palm oil and tallow, are preferred for the purposes of the invention. The methyl esters obtained may be used without further working up, after working up by distillation or even after hydrogenation of the unsaturated components. Accordingly, methyl esters of unsaturated and/or saturated fatty acids, preferably C.sub.12-22 fatty acids, such as lauric acid, oleic acid, stearic acid, behenic acid, linoleic acid and/or linolenic acid, may be used.
The fatty acid methyl esters are preferably used in the card spinning lubricants in quantities of 50 to 95% by weight and more preferably in quantities of 60 to 90% by weight.
The lubricants according to the invention may contain emulsifiers, additives, such as corrosion inhibitors, antistatic agents, coupling agents, bactericides, antioxidants, pH regulators and viscosity enhancers, as further constituents.
Suitable emulsifiers are nonionic, anionic and cationic emulsifiers, for example partial esters of di- and/or triglycerol, such as triglycerol monooleate, alkoxylated, preferably ethoxylated and/or propoxylated fats, oils, C.sub.8-22 fatty acids,
REFERENCES:
patent: 3926816 (1975-12-01), Cohen et al.
patent: 4110227 (1978-08-01), Newkirk et al.
patent: 4127490 (1978-11-01), Newkirk et al.
patent: 4201680 (1980-05-01), Waltenberger et al.
patent: 5282871 (1994-02-01), Yamane et al.
Textil Praxis International, 1984 (8), pp. 748-758 [no month].
Vollmert, "Grundriss der makromolekularen Chemie", Band III, pp. 55-61, Karlsruhe 1982 [no month].
"Neue Aspekte des Avivierens in der Streichgarnspinnerei", von Dr. Veitenhansl et al. in Textilpraxis international, Aug. 1984, pp. 748-756.
Becker Wolfgang
Eicken Ulrich
Mathis Raymond
Robrahn Karin
Stapper-Druyen Silvia
Grandmaison Real J.
Green Anthony
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Szoke Ernest G.
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