By Gerhard Gierenz, Werner Karmann
Adhesion is one of the oldest applied sciences recognized to mankind, however the know-how of adhesives started to growth with the advancements in chemistry within the early 1900s. the previous few years have obvious great growth within the functionality of adhesives, permitting items to be attached inseparably. smooth adhesives practice so good that extra subtle becoming a member of equipment, e.g. welding, can usually get replaced by way of adhesion, which means that adhesives have came across new parts of program. This booklet permits readers to fast achieve an outline of the adhesives on hand and to choose the simplest adhesive for every objective.
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Additional info for Adhesives and Adhesive Tapes
Hence, the adhesive layer must have a high dielectric loss factor. High-frequency sealing auxiliaries generally contain vinyl chloride copolymers in addition to proportions of other polymers, such as polyacrylates, vinyl acetate copolymers, plasticizers, and resins. High-frequency heatable coatings have solids contents of 23 from 30 % (solutions) to 50 % (emulsions). Their activation temperature is in the range of 120 - 150 "C. High-frequency sealing powders consist predominantly of finely divided polyamides.
Cyanoacylate Adhesives. Methyl, ethyl, butyl, and methoxyethyl esters of cyanoacrylic acid are used for cyanoacrylate adhesives ; soluble polymers and plasticizers are incorporated to regulate viscosity and for elastification. Cyanoacrylate adhesives rapidly polymerize by an ionic reaction mechanism initiated simply by weak bases to form high molecular mass, but largely uncross-linked polymers. In most cases, atmospheric moisture or the film of moisture on the substrate is sufficient to initiate polymerization, because the adhesives are applied in very thin layers.
Foamable hot-melt adhesives have been commercially available since 1981. Nitrogen or carbon dioxide is introduced into the hot-melt adhesive and results in a 20-70% increase in adhesive volume. Foaming increases hot-melt spreading and open time. This method is usually used with polyethylene hot-melt adhesives that are applied to selected metal, plastic, paper, porous, and heat-sensitive substrates. Low-melt adhesives are hot-melt adhesives with an application temperature in the range of 100- 120 "C instead of 160- 190 "C.
Adhesives and Adhesive Tapes by Gerhard Gierenz, Werner Karmann