MUNICH/NUREMBERG, GERMANY: Wacker will be presenting four speciality grades of HDK pyrogenic silica for paint, coating and adhesive applications. Hydrophobic HDK H30RM and HDK H30LM are particularly suitable for rheology control in automotive clear coats.
HDK H30RY can be chemically incorporated into resin networks and can improve mechanical properties of surface coatings and sealants. HDK H20RH possesses excellent storage stability in basic systems and is ideal as a thickening agent in two-component adhesives and jointing compounds.
HDK pyrogenic silicas are white, amorphous powders of low density and large specific surface area. This high surface-area-to-mass ratio is responsible for the outstanding rheology effect of HDK products.
Improved rheology control
The hydrophobic HDK H30RM and HDK H30LM grades feature high specific surface areas and silane modification with pronounced water repellency, which is greater in HDK H30RM. The two products are particularly suitable for binder systems of high polarity, whereby more pronounced rheology effects can be achieved with HDK H30RM. Both grades exhibit excellent transparency in clear coats.
Furthermore, they are entirely free of polydimethylsiloxane (PDMS) and thus enable crater-free surfaces during coating application. Accordingly, their main applications include surface coatings for the automotive industry and high-quality industrial paints.
Additive with methacrylic functionality
HDK H30RY is a hydrophobic, methacrylic-functional silica. The reactive product can be chemically incorporated into resin networks, enhancing mechanical properties of systems based on vinyl esters, polyesters or acrylates. This yields a broad range of applications – from coatings and adhesives to sealants. Moreover, the properties of dental fillings and nail gels can be optimised with HDK H30RY.
Excellent storage stability in basic systems
HDK H20RH is a hydrophobic silica that has been treated with alkylsilane. The silicone-fluid-free additive features exceptional rheological activity in polar systems and prolongs the shelf life, even at high pH values. It is thus suitable for use in amine hardeners of two-component adhesives.
Further application fields include automotive adhesives, half-shell bonding in wind turbines, and chemical anchors. In addition, HDK H20RH can give jointing compounds favourable pull-off characteristics. It also features good wetting properties. Products formulated with this silica can thus generally be painted over very well after curing.
© Chemical Today News
Read More: WACKER presents pyrogenic silica grades for paint, adhesive applications
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