Hair spray
Hairsprays will make a ready-styled hairdo durable. Advantageously, a hair spray for hold of the hairstyle in adverse weather conditions.
The hair spray is like a hairnet, the ingredients can be washed out again. The non-volatile components in the hair spray to give the hair a fresh shine.
History
The hair spray was invented in 1955 and first marketed. The technical basis for the hairspray was the invention of spray that could atomize liquid. This technique was invented by an American, Robert Abplanalp 1953 with the one-inch valve.
The origin lies in the developed in 1932 by Erik Rotheim flit syringe. It would work for American soldiers in jungle warfare against Japan for mosquito control.
First brand names were Wella Flex and taffeta.
As a raw material for the production of hair spray was first used shellac, the secretion of the lac insect (from the first records were made ), mixed with perfume oils with musk components as well as with the propellant gases CFCs ( chlorofluorocarbons ), because in the 1980s, the environmental impact were very controversial. Except for shellac, which is still used in natural cosmetics, all components have been replaced by other materials. The blowing gas propane -butane mixtures are currently used. To gloss silk proteins or high-quality vegetable oils are used, for example. In the 1970s and 1980s, the hair spray has experienced a renaissance among punks and poppers. A similar effect can also be achieved with hair gel.
In 2005, the production of Hairspray took 229 million cans a second place on the aerosol market.
Chemical ingredients
The main components are polymers of vinylpyrrolidone and vinyl acetate in concentrations of 2 to 5%. They are used as a film former in hair form. The higher the concentration, the higher including the consolidation degree. They are on the one hand washable ( hydrophilic polymer polyvinylpyrrolidone ), on the other hand, some water-repellent ( by the hydrophobic polymer polyvinyl acetate). Is abbreviated the mixture VP / VA copolymer ( vinyl pyrrolidone / vinyl acetate ).
The solvents used primarily ethanol, but water can also be included as a solvent. A large proportion also account for the propellant gases, propane, butane and / or dimethyl ether.
A hair spray also contains silicone oils, which give the hair a better shine and protect hair from UV rays. A little perfume oil (approximately 0.2 % ) is used for odor masking the other Komponten.
Since the late eighties, too, especially firming Haarfilmbildner as Octyacrylamid, acrylates were used. These strong Haarfilmbildner called hair lacquers. Copolymers of vinyl acetate with crotonic acid and the hydrophilic properties of the film can be influenced.
Hair sprays often also contain alcohol (s ) as a carrier, because it evaporates very quickly.
Other areas of application
- For fixing of coal and chalk drawings
Precautions in handling hairsprays
The hair spray should not get into the eyes, the aerosol mist should not be inhaled. The escaping gas should not come into contact with fire. The containers must be protected from sunlight and temperatures above 50 ° C.