Non-Sag Additives for Adhesives and Sealants

Last update on Jan 22, 2003

To insure that adhesives and sealants function wellduring their application and end-use, the formulator must be able to control the flowproperties of the product. The challenge that the formulator faces is that the adhesive orsealant may need different flow characteristics at different times.

For example, adhesivesmust flow readily so that they can be evenly applied to a substrate and wet-out the surface.Yet, there should not be an excess of penetration into porous substrates, nor should theadhesive "run" or "bleed" to create a starved joint.

Certain adhesives and sealants mustalso be capable of easy flow application by trowel or extrusion, but they must also exhibitsag and slump resistance, even at elevated temperatures. Therefore, the flow properties, orrheology, of the material must fit the desired method of application.

Rheological Additive Benefits

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Rheology of Adhesive and Sealant Formulations

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Thixotropy

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Rheological Additives

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References

Gerace, M. J. and Sullivan, C., "Cellulose Fibers as a Reinforcing Thixotrope in Adhesives and Sealants", Adhesives Age, July 1995, pp. 18-23.
Kevlar: Sealants and Adhesive Group, DuPont Company, Wilmington, DE.
Nargiello M., "Hydrophobic Silicas Contribute to Consistency in Formulating", Adhesives Age, July 1989, pp. 30-31.
Sugimori, M., et. al., Japanese Patent 01132662 to Sunstar Engineering, Inc.
Schirripa, T.J., "Rheology Control of Adhesive Systems With the Use of Fumed Silica", Society of Plastics Engineers, Technology Conferences, El Segundo, CA, 1980, pp. 201-212.
Mathur, K. and Peterson, E.A., "Effects of Calcium Carbonates on Polysulfide Sealants", Adhesives Age, November 1981, pp. 45-48.
Arstead, J. C., "Precipitated Calcium Carbonate's Particle Size, Surface Treatment Affect Sealant Rheology", Adhesives Age, July 1997, pp. 18-22.
Katona, A. and Hannah, A., European Patent Application 0 389 899 A1 to Tremoc Inc. (also in Reference 2, pp. 122-124).
Harrison, D., "Use of Ultrafine PCC in Construction and Glazing Sealant", adhesives.specialchem.com, September 25, 2002.
Ralston, H.P., "Kaolin, Talc, and Attapulgite Extend and Thicken Adhesives", Adhesives Age, July 1989, pp. 32-34.
Additives for Adhesives and Sealants, Elementis Specialties, Hightstown, NJ, 2002.
Carr, J.B., "Attapulgite-Based Thixotropes Offer Performance and Flexibility", American Paint and Coatings Journal, November 1997.