One Component Polyurethane of Fumed Silica


High-surface-area carbon blacks and fumed silica are more efficient on an equal-weight basis as reinforcing agent than other rheology-control additives. Carbon black is used to build viscosity, provide sag resistance, and increase the cohesive strength of automotive windshield adhesives. Coated precipitated calcium carbonates (PCCs) are used for rheology control of STP and polyurethane adhesives and sealants. Those PCCs with hydrophobic coatings (e.g., fatty acid or stearic acid) do yield shear-thinning rheology in polyurethane systems and have the added benefit of providing modest increases in adhesive strength. The increase of lap shear strength of a moisture-curing, one-component polyurethane adhesive consisting of a polyurethane prepolymer with NCO content < 2%, diisononylphthalate plasticizer, ground calcium carbonate filler, and organotin catalyst, with the addition of either a hydrophobic fumed silica or a coated PCC. On an equal-weight basis, treated fumed silica provides significantly more adhesive strength than the PCC in this system. Compounding the benefit of lower loading, fumed silica has a lower specific gravity than calcium carbonate and thus contributes far less to adhesive weight, which can benefit applications where adhesive weight is a concern (e.g., automotive lightweight). Pressure Sensitives: Fumed silica aggregates are commonly used to improve the processing and performance characteristics of films formed from natural rubber, polychloroprene, acrylates, and many other water-based latex emulsions. These submicron, high-specific-surface-area particles can decrease drying times, mitigate crack formation by modulating the capillary pressure, and enhance the mechanical properties of the final product. Pre-dispersed fumed metal oxides** provide an easy and effective "pour-in" means of incorporating these particles into the adhesive films. If you are looking for high quality, high purity and cost-effective Fumed Silica, or if you require the latest price of Fumed Silica, please feel free to email contact mis-asia.

Inquiry us

Our Latest Products

CAS No. 557-05-1 40% Water-based Zinc Stearate Zinc Stearate Emulsion

Product DescriptionProduct Description Description of zinc stearate emulsionZinc stearate emulsion is easy to disperse in water, has ultra-fineness, good dispersion compatibility. Zinc stearate emulsion has the characteristics of lubricating and deli...…

China factory cheapest price lightweight concrete wall panel making machine large hydraulic cement foaming machine equipment

Product performance of TR-40 Cement Foaming Machine1. The shell is made of high-strength precision thickened steel plate, painted twice, which is durable.2. The slurry output is uniform and stable, the density of the foam concrete finished product i...…

TR30 huge CLC concrete foam generator cement foaming machine Integrated machine for pouring light steel keel and structural wall

Company Profile Luoyang Tongrun Info Technology Co., Ltd. is committed to technology development, applications of nanotechnology and new material industries, with professional experience in the nano-technology research and developmen...…

0086-0379-64280201 skype whatsapp