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Abstract
This paper will discuss non-traditional chemical routes to carbon dioxide coblowing of polyisocyanurate foam formulations of the type generally used for roofing and sheathing insulation manufacture. Although there are plans to have commercial quantities of HCFCs available in the 1992 time frame, the cost of these materials may require supplemental, lower cost, blowing technologies to keep them economically superior to non-generic insulation products. The results of these studies to assess proccessability of these formulations, and the physical and flammability characteristics of the panels made from these non-HCFC routes to CFC-11 reduction will be described. all panels were made on production scale equipment and for the most promising alternate route, verified in a production facility. Chemical formulation and processing conditions wre chosen for easy translation to any full-size production facility. The formulations used are characterized by an isocyanate index of 250 using polyester polyols ;and contain no additive halogen or phosphorus flame retardant chemicals. the levels of CFC-11 reduction were 15% and 50% as calculated by the reduction of the CFC-11 weight per board foot of foam. The processability of the materials was determined by producing 1.5, 2, 2.5 inch thick laminate boards with asphalt/glass or a foil/kraft/cellulose nitrate facer material. the performance of the core foam of the boards was compared to non-reduced CFC-11 controls. Foam physical properties of density, initial and aged k-factor, compressive strengths and dimensional stability at various ambient conditoins along with falmmability performance via ASTM E-84 were determined. The results of the study indicate that the proper choice of polyols, catalysts and method of carbon dioxied co-blowing are critical to produce acceptable foams at higher CFc-11 reduction levels. Furthermore there are some unique synergistic effects of these various routes over the use of the isocyanate-water reaction to produce commercially acceptable foams.
This paper will discuss non-traditional chemical routes to carbon dioxide coblowing of polyisocyanurate foam formulations of the type generally used for roofing and sheathing insulation manufacture. Although there are plans to have commercial quantities of HCFCs available in the 1992 time frame, the cost of these materials may require supplemental, lower cost, blowing technologies to keep them economically superior to non-generic insulation products. The results of these studies to assess proccessability of these formulations, and the physical and flammability characteristics of the panels made from these non-HCFC routes to CFC-11 reduction will be described. all panels were made on production scale equipment and for the most promising alternate route, verified in a production facility. Chemical formulation and processing conditions wre chosen for easy translation to any full-size production facility. The formulations used are characterized by an isocyanate index of 250 using polyester polyols ;and contain no additive halogen or phosphorus flame retardant chemicals. the levels of CFC-11 reduction were 15% and 50% as calculated by the reduction of the CFC-11 weight per board foot of foam. The processability of the materials was determined by producing 1.5, 2, 2.5 inch thick laminate boards with asphalt/glass or a foil/kraft/cellulose nitrate facer material. the performance of the core foam of the boards was compared to non-reduced CFC-11 controls. Foam physical properties of density, initial and aged k-factor, compressive strengths and dimensional stability at various ambient conditoins along with falmmability performance via ASTM E-84 were determined. The results of the study indicate that the proper choice of polyols, catalysts and method of carbon dioxied co-blowing are critical to produce acceptable foams at higher CFc-11 reduction levels. Furthermore there are some unique synergistic effects of these various routes over the use of the isocyanate-water reaction to produce commercially acceptable foams.
Date
10/1990
10/1990
Author(s)
S Knis; D Ference; E Kennedy; D Bhattacharjee; S Dai
S Knis; D Ference; E Kennedy; D Bhattacharjee; S Dai
Page(s)
260-265
260-265
Keyword(s)
polyisocyanurate; foam insulation; CFC-11; blowing agent
polyisocyanurate; foam insulation; CFC-11; blowing agent