By S.N. Singh
This overview discusses the felony necessities and estate standards for blowing brokers in several functions. It highlights the results of fixing blowing brokers together with the necessity for reformulation. Many new polyols, isocyanates and surfactants are being built to beat difficulties. every one kind of blowing agent is defined. Key environmental and actual homes are indexed, including benefits and obstacles. Foams are defined by way of kinds and by means of functions. an extra listed part containing numerous hundred abstracts from the Rapra Polymer Library database supplies worthwhile references for extra interpreting.
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Additional info for Blowing Agents for Polyurethane Foams
Proceedings from a conference held Frankfurt, 13th-14th March 2001. , 2001, Paper 20. 012 © Copyright 2002 Rapra Technology Limited HFC-245FA & HFC-245FA BLENDS: BLOWING AGENT SOLUTIONS FOR ALL RIGID AND INTEGRAL SKIN FOAM APPLICATIONS Williams D; Bogdan M Honeywell Inc. ) An update is presented of the commercialisation of HFC245fa as a blowing agent for rigid and integral skin polyurethane and polyisocyanurate foams. Included is an analysis of the blowing agent needs of each major rigid and integral skin foam market segment: appliances, boardstock, spray foam, and systems for panels, doors, water heaters, pour-in-place, etc.
Even though these developments have expanded all water blown technology, it is still not possible to produce the full range of products using these new polyols alone. Special softening additives that alter the polymer morphology and soften the foam have been developed (373). Modifiers such as Geolite® facilitate the production of numerous foam grades at very low indexes while maintaining acceptable physical properties (162). Other modifiers such as Unilink® 4200 are shown to improve the blowing efficiency of CO2 (water) and thus decrease density, while retaining physical properties including softness (253).
22). 2 Discontinuous Slabstock Liquid CO2 is emerging as the auxiliary blowing agent of choice worldwide to make a full range of slabstock foam. Some of the more recent developments include use in making high performance, viscoelastic foam for high comfort bedding (39). 4 Alternative Manufacturing Technology A number of modifications to the foaming process to circumvent the need for auxiliary blowing agents and use water as the sole blowing agent have been developed. Forced cooling by rapidly blowing air through foam block is one such technology that has been successfully used by several producers (286, 287).