Performance comparison of different adhesives

Lepila, občutljiva na pritisk, se na substrat prilepijo že ob lažjem pritisku roke in pri tem kemijsko ne reagirajo. Obravnavane so štiri večje skupine lepil, in sicer lepila na osnovi organskih topil, lepila na osnovi vodnih disperzij, talilna lepila in UV-strjevalna lepila. Primerjane so njihove lastnosti, posebnosti, sestava in področja uporabe. V okviru eksperimentalnega dela so bili izvedeni testi za določanje odpornosti na razslojevanje s pomočjo dinamometra Zwick. Primerjale so se tri vrste lepil, občutljivih na dotik (akrilno lepilo na osnovi vodnih disperzij, UV-strjevalno akrilno lepilo in talilno lepilo na osnovi kavčuka), ki so bila nanešena na netkan tekstil. Merila se je sila, potrebna za odstranjevanje vzorcev, pritrjenih na stiropor, nerjaveče jeklo in vlaknocementne ploščice. Rezultati so pokazali dobro učinkovitost lepljenja UV-strjevalnega lepila na vse tri podlage, akrilno lepilo na osnovi vodnih disperzij se je po procesu staranja zelo slabo lepilo na podlago iz nerjavečega jekla, talilno lepilo na osnovi kavčuka pa je doseglo zadostno odpornost na razslojevanje za uporabo na vseh podlagah.Pressure sensitive adhesive stick to substrate by applying light pressure using hands and in doing so do not chemically react. Four major groups of adhesives are discussed, namely solvent adhesives, emulsion adhesives, hot melt adhesives, and UV-curable adhesives. Their properties, unique features, composition, and fields of applications are compared. As part of the experimental work, tests were carried out to determine peel resistance using Zwick dynamometer. Three types of pressure sensitive adhesives (waterborne acrylate adhesive, UV-curable acrylate adhesive and hot melt rubber adhesive) applied to nonwoven textiles were compared. The force required for removing samples attached to polystyrene, stainless steel and fibre cement plate was measured. Results showed good adhesion performance of the UV-curable adhesive to all three substrates, the waterborne acrylate adhesive had very poor adhesion to stainless steel substrate after aging process, and the hot melt rubber adhesive achieved sufficient peel resistance for application to all substrates