BASF

Lugalvan FDC

 
Aqueous Emulsionof an Ethylene Copolymer
Водна дисперсія кополімеру етилену

Опис:
Lugalvan FDC is an aqueous polymer emulsion that is free of emulsifiers. It is miscible in all proportions with water, provided the pH does not fall below 8.5. Experience has shown that it can be advisable to adjust the pH to approx. 9 if necessary with ammonia or with amines such as triethanolamine or dimethylethanolamine in order to prevent the solids from precipitating. Lugalvan FDC can be applied by dipping, spinning or spraying.
Careful attention should be paid to ensure that foam does not form if it is applied by spraying. For instance, 200 ml of a solution of Lugalvan FDC that has been diluted down to a solids content of 15% forms more than 350 ml of foam after 30 cycles in a foam-testing apparatus when it is agitated for 30 seconds and then left to stand for 30 seconds. The volume of foam that is formed can be reduced to less than 50 ml by adding 0.1% Degressal® SD 20 without impairing the corrosion resistance.
The thickness of the polymer film can be controlled by adjusting the viscosity. The viscosity largely depends on the solids content of the bath, but it can also be influenced by the bath temperature, pH or the presence of additives. Transparent films that are applied by dipping in an aqueous bath usually have a thickness of 1 – 10 µm. Thicker films can be applied by dipping the substrate several times and allowing it to dry each time it is dipped. Very homogeneous films are obtained by consecutive dipping into diluted solutions of Lugalvan FDC and intermediate drying steps. If baths are open to the atmosphere and stirred, it is advisable to monitor their solids content to ensure that the film thickness remains constant.
Depending on the thickness of the film, it is usually advisable to dry the film at elevated temperatures. Depending on their size, shape and thickness, components that have been coated with Lugalvan FDC can usually be dried to a tack-free finish by drying them 1 minute at 80 °C (fan heater). For increased corrosion protection drying at elevated temperature or prolonged reaction time is recommendable, e. g. 10 minutes at 80 °C or 1 munite at 130 °C. The drying times are corres­pondingly shorter at higher temperatures. The film can gradually become yellow if it is exposed to temperatures in excess of 150 °C for prolonged periods, but the discoloration is purely aesthetic and the polymer does not undergo any thermal degradation.
Lugalvan FDC can be coloured with our Luconyl® and Dispers pigment preparations, which normally need to be added at a rate of 0.1 – 5%. The pigments can simply be mixed in by stirring and no elaborate mixing techniques are necessary, but we would recommend filtering the emulsion if necessary in order to remove any undispersed pigment.

 

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