Blowing Agents and Foaming Processes 2013 by Smithers Rapra

By Smithers Rapra

Smithers Rapra's across the world popular Blowing brokers and Foaming tactics convention will happen in Mainz on 14-15 may possibly 2013. Now in its 15th 12 months, this convention has been firmly confirmed because the foremost occasion for these excited about the formula and alertness of blowing brokers and methods to provide multiplied or foamed polymer substrates. this present day there are various strategies on provide - new tools, resins, expertise, strategies and ingredients and apparently call for for better functionality and decrease bills is decided to once more force technical advancements in polymeric foams. This occasion delivers these desirous about the manufacture of blowing brokers, PU foam insulation and packaging, foam extrusion and gear manufacture a chief chance to determine what is particularly occurring during this quarter.

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The results are given in Table 5. ) A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 3 3 3 3 4 3 3 4 3 3 2 5 5 4 4 17 14 17 16 15 14 14 15 13 14 12 14 17 15 13 All formulas were again placed back in the oven at 50oC (122oF). After another week of aging, the formulas were removed from the oven, brought back to 25oC, and tested again. These results are in Table 6. ) A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 C5 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 21 14 18 20 14 15 13 16 16 14 12 12 16 15 14 This process of aging for a week and testing was continued for three more weeks for a total of 5 weeks.

The cellular structure of the foamed samples is analysed using digital image processing and the software OZELLA, which has been developed at IKV. As quality characteristics for analysis of the cell structure, cell density and cell diameter are chosen. Cell density is defined as the number of cells per volume of foamed part. RESULTS AND DISCUSSION The presented experimental results give an insight into the influence of the use of a nucleation agent as well as the influence of processing parameters on the foam quality of physically foamed silicone rubber profiles.

EXPERIMENTAL PART Two different rapeseed oil polyols were synthesized using epoxidation followed by ring opening of oxirane groups. Isopropanol and diethylene glycol were used as nucleophilic agents for ring-opening of epoxidized rapeseed oil (REPOX), in order to obtain RIso and RDEG polyols, respectvely. The rapeseed oil polyols were characterized by hydroxyl, acid and epoxy values, water content and viscosity (Table 1). % Colour RO 25 pale yellow REPOX 0,260 185 0,01 F3600 48 450 0,02 RIso 80 0,031 1180 0,03 RDEG 156 0,000 6350 0,28 orange colourless pale yellow orange The petrochemical polyol F3600 (PCC Rokita, Poland) was used to prepare the reference flexible polyurethane foams indicated as REF.

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