Ingeniero Químico

Páginas: 8 (1963 palabras) Publicado: 9 de octubre de 2012
Dow Chemical Company
Business-enabling Polyurethane Systems

Page 1

New Generation of Water Blown Rigid PU Foams using blowing agents with Zero ODP and Low GWP.
• Ing. Fabian Negretti • Responsable de Servicio Técnico & Desarrollo

• Poliuretanos - Región Sur LAA
Mesa redonda sobre tecnologías alternativas al HCFC141b – Santiago de Chile –Julio 2012

• Introduction
• • • •• The Dow Chemical Dow Polyurethane Formulated System Business Polyurethane Market What is Polyurethane

• • • • •

Blowing Agents Transition Cold Chain Water Blown PU System Gen 2 Experimental Data Summary and Conclusions

Page 3

Dow Polyurethanes: An Industry Leader

• World’s largest producer of propylene oxide, propylene glycol and polyether polyols
• A leading producer of aromaticisocyanates

• True Global Reach: Expansive, global network of world-scale integrated assets with low cost-to-serve positions
• 27 global manufacturing facilities • 29 systems houses • Present in 28 countries around the globe

• Full backward integration to feedstocks
• Backed by the strength, scale and resources of global Dow

• More than 60 years experience in polyurethane technology •On-going investment in market-focused and customer-centric technologies and process optimization
September 2011 4

Primary Polyurethane Markets






September 2011


Formulated Systems Businesses and Technologies
Polyurethane Rigid Foams AlternativeEnergy and Composites Polyurethane Flexible Foams Polyurethane Microcellular/ IS Foams Polyurethane Casting Polyurethane Adhesives Polyurethane Composites Epoxy Casting and Adhesives Epoxy Composites

Energy Efficiency
Industrial Casting and Adhesives Infrastructure Life Preservation Leisure and Lifestyle Appliances Automotive Building and Construction


Page 6

Polyurethanefor Energy Efficiency Solutions

Polyurethane is a versatile polymeric material used in a variety of applications, with a range of density and mechanical properties; among the others... • Rigid foams
• Building industry (boards, metal faced sandwich panels, in-situ spray applications) • Cold chain (refrigerated transport, refrigerated warehouses, supermarket display counters, domesticfridges/freezers) • Water heaters • Pre-insulated pipes (district heating/cooling and oil and gas).

• Elastomeric polyurethane
• Wet insulation for subsea pipelines • Adhesives for insulated panels

Page 7

What is Polyurethane

source: UNEP

Page 8

What is a Rigid Foam
From the Glossary of Urethane Industry Terms • Those foam products having a firm stiff behavior • Exceed their elasticlimits with deformations higher than 10% Rigid PU foam is a highly cross-linked, cellular insulating construction material of low density • Usually it is closed cell • The cell structure comes from expansion of a chemical or phisycal blowing agent Typically they are used for • Thermal insulation • Buoyancy • Packaging • Furniture • Equipment housing

Page 9

With or Without bubbles

Page 10 What is a Blowing Agents
• Definition:
• The substance that causes the polyurethane foam to expand lead to a cellular structure. This can be done by either chemical reaction and/or physical evaporation, facilitated by the heat of reaction

• e.g. Water is a chemical blowing agent:
• Physical blowing agents can be gases or low boiling point liquids (HC, CFC, HCFC, HFC,HFO ...)

• Theblowing agent in the cells has low thermal conductivity and plays a major role in determining the thermal conductivity of the foam.
Page 11

Polyurethanes Deliver the Best Insulation

2.5 cm rigid polyurethane 4.0 cm polystyrene 4.5 cm glass fiber 5.0 cm cork 12.0 cm wood 40 cm bricks

Page 12

HCFC Phase Out
• The Montreal Protocol on Substances that Deplete the Ozone Layer stands as...
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