Volume 4, Issue 10 (November 2007)

    Attapulgite as a Thixotropic Suspending Agent

    (Received 11 October 2005; accepted 24 October 2007)

    Published Online: 2007

    CODEN: JAIOAD

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    Abstract

    Attapulgite is a hydrous magnesium aluminum silicate clay mineral with a unique structure made up of colloidal particles called spicules. Gellation takes place following dispersion when the spicules become attracted to each other, become entangled and form the matrix structure that thickens, entraps, and suspends solids. Proper dispersion and gelling is dependent on the amount of shear and length of time it is applied or the use of chemical means to facilitate dispersion. To achieve gellation chemically dispersed clay must come into contact with a chemical salt which causes spicules to associate with one another and the gel to instantly form. Attapulgite can also be used to structure organic systems with the proper use of a cationic surfactant. The basic advantages of attapulgite as a structuring agent are versatility, compatibility with a variety of liquid systems, functionality over a wide pH range, and resistance to attack by microorganisms. It is relatively economical and provides a thixotropic liquid system.


    Author Information:

    Wolford, John
    Account Manager, BASF — The Chemical Company, 7161 Ox Bow Circle, Tallahassee, FL


    Stock #: JAI100396

    ISSN: 1546-962X

    DOI: 10.1520/JAI100396

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    Author
    Title Attapulgite as a Thixotropic Suspending Agent
    Symposium Pesticide Formulations and Delivery Systems: 26th Volume, 2005-10-20
    Committee E35