Wirkungsweise polymerer Vergrauungsinhibitoren in Waschmitteln

Abstract

In laundering, oily soils are detached from textile surfaces and dispersed. In addition, the washing solution should reduce the redeposition of free suspended soilparticles onto the textile fibres.In the case of a recommended predetermined dosage of a detergent the main part of the required stabilizing effect is due to the surfactants, complexing agents, builders and zeolites. Polymei'ic antiredeposition agents cause only gradual additionalimprovements. In the case of a weak dosage the stabilizing effects of the surfactants and builders rapidly decrease and the effects of the polymeric antiredeposition agents increase.The mechanism of these effects is characterized by high selectivity of the textile substrates. In the case of polar textiles (for instance cotton) carboxy methyl cellulose is often successfully used. In this case the mode of action is mostly due to steric repulsion of the adsorbed layer.In the case of hydrophobic polyester fibres cellulose ethers with hydrophohic sidechains (for instance hydroxy propyl cellulose) show very good effects. In this case the stetic component of the polymeric repulsion is supported by the decrease of the driving force of the heterocoagulation (hydrophilization of all hydrophohic interfaces). For this reason combinations of several antiredeposition agents are often used for mixed fabrics.The performenace of the polymeric agents for polyesters can be characterized by their ability to cause strong effective irreversible hydrophilization effects despite the competitive influences of the residual detergent ingrediences.

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

“…55 Recently, zwitterionic amino cellulose sulfate derivatives have been obtained. 56,57 While the most common usage for cellulose is in paper production, cellulose derivatives are used as anti-redeposition agents in detergent formulations, as conditioners in shampoos or as thickeners, [58][59][60] not least because cellulose is a renewable resource and the material is biocompatible and biodegradable. The structure and dynamics in bulk and at the interface of complexes formed from oppositely charged cellulose based polyelectrolytes and surfactants have been studied extensively over the past few decades and several review articles dealing with different aspects of the use of water soluble cellulose based polymers are available.…”