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polymer fillers 1-8-08

polymer fillers 1-8-08 - – Paints – Stains Antioxidants...

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1 Polymer Additives and Compounding Douglas J. Gardner Professor Wood-Polymer Hybrid Composites Additive Ingredients • Reinforcing fillers • Inert fillers • Plasticizers and lubricants • Foaming Agents • Colorants • Antioxidants • UV Absorbers • Biocides • Fire-retardants
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2 Reinforcing Fillers • These improve tensile strength, tear strength or composite modulus – Carbon black – Silica –G la s s – Wood fiber – Nanofillers Inert Fillers • May not change final properties of the polymer, but make the polymer easier to process and lower cost.
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3 Plasticizers and Lubricants • Petroleum-based oils • Fatty acids •E s t e r s • Waxes Foaming Agents • Reduce density • Physical Foaming agents –CO 2 –N
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4 Colorants •P i gm e n t s
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Unformatted text preview: – Paints – Stains Antioxidants • These generally act as free radical “sinks” and thus stop the chain reactions in oxidation 5 UV-Absorbers Biocide Additives-WPC • Borates – Results of published work in the literature • Isothiazolone • Etc. • Companies are now adding moldicides – Correct Deck • Work in progress 6 Fire-retardants • Inorganic – ammonium or diammonium phosphate – borates – zinc chloride • Organic – polymers and resins – halogenated and organophosphorous compounds Compounding • Dry blending and mixing – Ribbon blenders – Speed Mixer • High Shear Mixing – Kady Mill – Cowles dissolver • Melt Mixing – Brabender – Thermo-Haake 7 Measuring Dispersion • Visual • Light microscopy • Electron microscopy – TEM – SEM • Atomic force microscopy • X-ray diffraction...
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  • Fall '08
  • DG
  • Pigment, Reinforcing fillers Inert fillers Plasticizers and lubricants Foaming Agents Colorants Antioxidants UV Absorbers Biocides

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polymer fillers 1-8-08 - – Paints – Stains Antioxidants...

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