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Factors affecting the abrasiveness of filled rigid PVC dry blends
Author(s) -
Augustyn E. J.,
Leonard J.
Publication year - 1992
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730140308
Subject(s) - abrasion (mechanical) , abrasive , materials science , composite material , mixing (physics) , particle size , filler (materials) , magnesium , metallurgy , chemical engineering , physics , quantum mechanics , engineering
Abrasion due to the high speed mixing of rigid PVC dry blends filled with CaCO 3 was found to be a function of both the mixing conditions and type and level of CaCO 3 used. Laboratory scale tests showed that abrasion is a function of mix time, mix speed, and mixer blade geometry. These variables were standardized to develop a laboratory abrasion test using a Hockmeyer mixer equipped with a soft 3‐in diameter aluminum mixing blade. This procedure was used to investigate the effect of CaCO 3 property variables on abrasion during rigid PVC dry blending. Multiple linear regression analysis at 30 phr CaCO 3 showed that abrasion increased with filler top cut, mean, acid insolubles, and MgCO 3 content, but diminished with an increase in percent less than 1 micron fraction. A more generalized abrasion predictor model was developed by considering surface area to be a linear function of top cut, mean, and percent less than 1 micron properties. Abrasion was greatly minimized by using finer particle size, higher surface area CaCO 3 with low acid insoluble and magnesium carbonate levels. These criteria also aid in reducing the abrasive effects of TiO 2 during dry blending through a CaCO 3 /TiO 2 interaction.