Laboratory incubators are scientific equipment found in most research, analytical, or diagnostic laboratories. Lab incubators store collected samples or specimens in specified conditions so that the biological or chemical processes in the samples can take place in the desired conditions and with the least disturbance from uncontrollable influences.
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Figure 8 -elongation at break of the vulcanizates prepared with different raw materials, mixing cycles and processing aids 700 600 Elongation at break (%) therefore, leads to the improved tensile strength and elonga-tion at break. Conclusions The best mixing cycles for each group of compounds are the long mixing cycle for the conventionally mixed compound, which requires silanization, and the very short mixing cycle for the pre-silanized and masterbatch compounds. Processing aid Ultra-DFR 900 with a higher polarity is more efficient than Ultra-Flow 700S, and especially suitable with the masterbatch compound which is very shortly mixed. Overall, the properties of the masterbatch compound with the very short mixing cycle are as good as the properties of the longer conventionally mixed compound. Combining this with the advantages of shorter production time and better material handling, the NR-silica masterbatch is obviously a better solution than the con-ventional silica/silane-based system. This article is based on a paper presented at the 194th Technical Meeting of the Rubber Division, ACS, October . References 1. H-D. Luginsland, J. Fröhlich and A. Wehmeier, Rubber Chem. Technol., 75, , p. 563. 2. J. Bertrand and J. Bauer, &#;NR-silica masterbatches: An easy processing way to high quality silica compounds,&#; Tire Tech-nology Annual Review, November . 3. W. Kaewsakul, K. Sahakaro, W.K. Dierkes and J.W.M. Noor-dermeer, Rubber Chem. Technol., 85, , p. 277. 500 400 300 200 100 MB-PA2_VS (6) DM-PA2_VS (1) (2) (3) (4) (5) (7) (8) 0 DM-PA1_L DM-PA1_VS PS-PA1_L PS-PA1_VS MB-PA1_L best to have the long mixing for the dry mix and the very short mixing for the others. As portrayed by the macro-dispersion (figure 5), the very short mixing is not sufficient for the dry mix to achieve a good dispersion and hydrophobation, and thus results in a lower reinforcement. The shorter mixing cycle for silica-masterbatch compounds retains the rubber chains/ networks, while the silica particles are well dispersed. This, ORDER nOw! ORDER NOW From RUBBER WORLD Magazine&#;s MB-PA1_S Blue Book Materials, compounding ingredients and services for the rubber industry 201 9 A Lippincott and Peto Publication oldest and most comprehensive buyers Long regarded as the The Buyer's Guide for the Rubber Industry guide has served the industry for over 60 years with industry professionals rely-industry's single most ing on it to locate a wealth of sources and services when making important important reference purchasing decisions. for technical RUBBER RED BOOK is a must for indus-try professionals who need comprehensive information, the up-to-date purchasing information on the many products and services available to Blue Book contains the rubber industry. detailed &#; Rubber information Machinery & Equipment &#; Laboratory & Testing Equipment on every raw and material &#; Accessories Fittings Rubber Reclaimers & Recyclers used by &#; &#; the rubber Rubber Chemicals & Compounding Materials industry-including &#; Synthetic Rubber 71st Edition &#; Fabrics and Textiles chemical additives, &#; Latex and Related Materials extenders, elastomers &#; Educational Courses in Rubber Chemistry and Technology and latexes, fillers and &#; Technical and Trade Journals reinforcing materials, A Lippincott & Peto Publication RUBBER RED BOOK listings for more than 1,200 rubber product manufacturers carbon black and grouped by location and products. Order coloring materials, to the RUBBER RED BOOK TODAY name a few. n n Payment enclosed Send bill (U.S.) Charge credit card: n Visa n Mastercard RUBBER RED BOOK , The industry&#;s Send order to: Lippincott & Peto, Inc. Akron-Peninsula Rd. &#; Akron, OH Or Fax to: (330) 864- RUBBER RED BOOK , The industry&#;s oldest and most comprehensive buyers guide has served the industry for over 60 years with industry professionals relying on it to locate a wealth of sources and services when making important purchasing decisions. Magazine&#;s Materials, compounding ingredients and services for the rubber n American Express Card number_______________________ Date card expires_____________ Signature_____________________________ Order the BLUE n BOOK and RUBBER RED BOOK TODAY www.rubberworld.com/bookstore or call +1 330-864- United States: $115.00 plus $12.00 n $ Name____________________________ Title_______________________________ Company____________________________________________________________ Address_____________________________________________________________ Outside U.S.: $147.00 $ Ohio residents add 6.75% tax $ City____________________________________ State_________ Zip____________ Price includes Postage & Handling. TOTAL $ Phone____________________________________ Date_____________________ __ address_________________________________________________________ OCTOBER/NOVEMBER | RUBBERTIREDIGEST.COM | 29
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