STP1328: Foam Control in Trisiloxane Alkoxylate Systems

    Policello, GA
    Scientists, Witco Corporation, OSi Specialties Group, Research and Development, Tarrytown, NY

    Koczo, K
    Scientists, Witco Corporation, OSi Specialties Group, Research and Development, Tarrytown, NY

    Pages: 9    Published: Jan 1997


    Abstract

    The properties that make trisiloxane alkoxylates (TSA) so desirable, such as superspreading and spray coverage, also present some challenging issues with regard to their use in the field. Since TSAs are highly surface active, they can produce an extremely stable foam. Traditional antifoam compounds, based on polydimethylsiloxane oils (PDMS) have proven to be ineffective in controlling foam generated by TSA surfactants. It is believed that the antifoam oil droplets must enter the air/water interface of the foam film in order for foam rupture to occur. If the oil droplet forms a stable pseudoemulsion film at the interface, and the droplet does not enter the surface, foam control is not achieved. Unfortunately this is the case with traditional foam control agents.

    Oils based on novel siloxane propoxylates have been found to form unstable pseudoemulsion films in trisiloxane alkoxylate solutions, thereby overcoming the low efficiency associated with traditional foam control agents in TSA systems.

    Keywords:

    trisiloxane alkoxylate, foam control, TSA, trisiloxane, pseudoemulsion film


    Paper ID: STP13843S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP13843S


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