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Product overview
CRAYVALLAC® PA3 WDA 20 is a pre-activated amide wax dispersed in a mixture of mineral spirit (D60) and alcohols. It is a rheology modifier in paste form for post-addition to solvent-based coatings with low polarity systems. The use of CRAYVALLAC® PA3 WDA 20 provides a very simple and direct means of introducing shear-thinning rheology with thixotropic viscosity recovery to coating formulations. CRAYVALLAC® PA3 WDA 20 is also a very cost efficient alternative to organoclays.CRAYVALLAC® PA3 WDA 20 is a pre-activated amide paste and exists in the form of crystalline fibres. In a coating system, these fibres form an interacting network. It is this fibrous network that gives rise to the shear-thinning rheology of the final coating. This shear-thinning characteristic provides a very high viscosity under the low shear rates associated with sedimentation, and a low viscosity at the much higher application shear rates. The net result is excellent control of sedimentation combined with ease of application. Immediately following application, where low shear conditions again predominate, the coating’s viscosity undergoes a time dependent recovery as the network re-establishes itself. This time dependence is known as thixotropy and enables the final coating to attain very good levelling. In order to obtain maximum efficiency from CRAYVALLAC® PA3 WDA 20, it is necessary to disperse this product without destroying the crystalline fibres. It is therefore preferable to incorporate CRAYVALLAC® PA3 WDA 20 under low to medium shear conditions over as short a time period as possible.
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