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“Dry latex.” A new method for the preparation of rubber‐filler powders
Author(s) -
Caspary R.,
Heske J.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070240204
Subject(s) - masterbatch , plastics extrusion , materials science , natural rubber , carbon black , angle of repose , filler (materials) , composite material , mixing (physics) , dispersion (optics) , polymer , extrusion , particle (ecology) , particle size , particle size distribution , vulcanization , chemical engineering , nanocomposite , oceanography , physics , engineering , quantum mechanics , optics , geology
A new method of preparing rubber powders, especially masterbatch powders, is described. It consists of the dispersion of polymer latices in highly hydrophobic fine particle‐size powders such as special silicas and carbon black, followed by drying. During the whole procedure the powders never lose their pourable state. Several powder properties, e.g., particle size distribution, pourability, bulk density, and angle of repose, are dealt with for NR and SBR powders. These powders require a high shear processing stage to disperse the black and rubber chemicals into the rubber matrix. For direct extruder feeding, a highly efficient extruder mixing screw is necessary. It is shown that the powders can be sufficiently protected against aging by use of special antioxidants. The procedure is characterized by an outstanding simplicity in respect to engineering and equipment. The future outcome of the method will depend on the balance between that simplicity and the energy demand which can be tolerated.