Blowing Agents and Foaming Processes 2012 by Smithers Rapra

By Smithers Rapra

Now in its fourteenth 12 months, this convention has turn into firmly demonstrated within the plastics neighborhood because the assembly position for processors, fabric providers, lecturers and end-users to switch rules and retain up to date with advancements during this speedy starting to be area of interest of the polymer zone. adjustments within the foam blowing were mostly pushed through environmental laws - even if matters over purchaser protection, atmospheric defense or reliable waste disposal and recycling. of their fundamental purposes in purchaser items, (such as cushioning for furnishings and vehicles, thermal insulation for development and packaging) polymer foams are being constantly better to interchange dense reliable polymers, losing weight and prices. certainly, strict strength rules in such a lot eu nations have boosted using polymer foams in construction and building, automobile and aerospace sectors the place foamed plastics are known for his or her functionality and processing benefits in addition to the most obvious price and weight mark downs. different polymer foams provide sensible functions similar to sink mark relief, elevated stiffness, insulation houses and a better average floor visual appeal or constitution.

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Chemical stability was evaluated by making hand-mix foams to produce foam reaction profiles after storage. A Graco H2035 spray machine was used to spray the foams. Tables 6 and 7 indicate the spray equipment conditions and foam properties. Foams produced with Paper 4 - Loh Page 4 of 12 pages Blowing Agents and Foaming Processes 2012 8-9 May 2012 – Berlin, Germany Formacel® 1100 exhibited good physical and chemical stability following six months of storage. Substitution of HFC-245fa with an equal weight of Formacel ® 1100 afforded slightly improved k-factors and improved mechanical properties.

The k-factors at 10 oC and 24 oC can further be improved by increasing the cyclopentane level from 20 wt% to 40 wt% while reducing the water level to zero. This example demonstrates the potential for Formacel® 1100 optimization to achieve foam expansion agent efficiency and insulation performance. Figure 8. 00 0 5 10 15 20 25 40 w t% Cp-60 w t% Formacel-1100 (no H2O) Temperature(C) Tables 14, 15 and 16 show the k-factor loss for foams produced using different mole percentages of Formacel ® 1100 and water.

Optimization based on application needs is required to improve the FEA efficiency and insulation performance. Page 7 of 12 pages Paper 4 - Loh 8-9 May 2012 – Berlin, Germany Blowing Agents and Foaming Processes 2012 Table 12. 6 ® ® FEA and water level based on 100 pbw Polyol and Additives Foam Properties 3 Packed density (kg/m ) o -4% -1% Table 13. 0 Formacel ® 1100 Level Optimization: Laboratory Study Our previous laboratory studies [4, 5] and customer evaluations summarized in Table 9 and 13 indicate that for a given application temperature, there is an optimal level of Formacel® 1100 which provides maximum insulation performance and FEA efficiency.

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