Blowing Agents and Foaming Processes 2013 by Smithers Rapra

By Smithers Rapra

Smithers Rapra's the world over popular Blowing brokers and Foaming approaches convention will happen in Mainz on 14-15 could 2013. Now in its 15th yr, this convention has been firmly validated because the leading occasion for these concerned about the formula and alertness of blowing brokers and methods to provide improved or foamed polymer substrates. at the present time there are many suggestions on supply - new equipment, resins, expertise, procedures and ingredients and it appears call for for greater functionality and decrease expenditures is determined to once more force technical advancements in polymeric foams. This occasion supplies these fascinated with the manufacture of blowing brokers, PU foam insulation and packaging, foam extrusion and gear manufacture a primary chance to determine what is rather happening during this sector.

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The average cell density of the foamed profiles is increased with increased amount of blowing agent. 8 % relating to compact material can be obtained using nitrogen as blowing agent. Influence of the nucleating agent In general it can be seen, that the use of a nucleating agent leads to finer cellular structures with smaller average cell sizes and higher average cell densities compared to cellular structures of the plain silicone rubber material. As expected, the use of a small amount of talcum improves the heterogeneous nucleation.

However, for both silicon rubber materials including or devoid of nucleating agent, a reduction of the die diameter increases the pressure gradient in the die. 7 MPa respectively. Figure 10 depicts the influence of the die diameter on the cell structure. The results are plotted for a silicone rubber material containing nucleating agent and for an unmodified material. Figure 10 – CT-images of the foamed silicone rubber samples for die diameters Paper 6 - Sitz Page 8 of 10 pages Blowing Agents and Foaming Processes 2013 14-15 May, 2013 – Mainz, Germany Comparable to physical foam extrusion of thermoplastics, the cell diameter of the foamed profiles decreases with increasing die pressure and thus increasing pressure gradient.

These systems have the lowest slope of dielectric polarization curves. They have also the highest maximum velocity of rising, what means, the reaction of isocyanate with water is more preferable than in the case of other used systems. In all cases the pressure starts to decrease when the foam stops to rise. At this point the pores crack and open cell material is produced. The interesting phenomenon was observed in the case of foams blown with MF. The pressure curves have bimodal shapes. The first maximum could be explained by pressure connected with generating of carbon dioxide in the reaction of isocyanate and water, and the second maximum is connected to evaporating of MF due to the exothermic reactions of TDI with polyols and water.

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