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Phenolic Resin Adhesives
Published in A. Pizzi, K. L. Mittal, Handbook of Adhesive Technology, 2017
Phenolic resins are also extensively used in the binding of foundry molds. Both resol and novolak resins are used for this application. The sand is coated with the phenolic resin at a load of 3%–4%. The PF resin can be used either as an organic solvent solution or in powder form. Coating of the substrate can be carried out either at ambient or at higher temperature. In higher-temperature coatings, novolaks are the preferred resins, and in this application, waterborne resins (75% resin) can also be used. Hexamethylenetetramine, as well as wax, is added. Hexamine is often added separately from the resin to avoid precuring.
The core-shell structured aqueous dispersions of the siloxane-grafted polyurethane copolymers with high transparency
Published in Journal of Dispersion Science and Technology, 2023
Waterborne polyurethane (WPU) has attracted growing attention due to its low volatile organic compounds, and easily adjustable physical and chemical properties. As superior alternatives of solvent-based polyurethane (PU), WPU possesses strong adhesives, high wear resistance, and corrosion resistance. Consequently, WPU has been utilized in various fields such as coatings, textiles, adhesives, inks, and paints.[1–4] Ionic groups (i.e., carboxylate and quaternary ammonium) or other hydrophilic segments are introduced into the polymer chains of WPU so that the polymers can disperse into the water more easily. However, they will limit mechanical properties and usually gives poor resistance to water. Recently, many methods have been developed to improve the properties of WPU including the incorporation of epoxy resins,[5] the use of hydrophobic siloxane or fluorine polyols,[6] and copolymerization or blending with some waterborne resins.