SYNTACTIC POLYURETHANE ELASTOMERS FOR USE IN SUBSEA PIPELINE INSULATION

摘要

Syntactic polyurethane elastomers are made using a non-mercury catalyst. The elastomer is made from a reaction mixture containing a polymer polyol which has a liquid polyether polyol as a continuous phase and polymer particles dispersed in the liquid polyether polyol, a chain extender, a polyisocyanate and microspheres. The elastomer adheres well to itself, which makes it very useful as thermal insulation for pipelines and other structures that have a complex geometry.

主权项

1. A process for making a syntactic polyurethane elastomer, comprising
forming a reaction mixture containing at least one polymer polyol having a continuous phase containing one or more polyether polyols including a liquid polyether polyol having a hydroxyl equivalent weight of at least 800 and dispersed polymer particles, the dispersed polymer particles constituting 1 to 50 wt.-% of the combined weight of the particles and all polyether polyol(s) in the reaction mixture, 5 to 50 weight percent of microspheres based on the total weight of the reaction mixture, 1 to 30 parts by weight of a hydroxyl-terminated chain extender per 100 parts by weight of the polyether polyol(s), 0.10 to 0.25% based on the combined weight of all components of the reaction mixture except the polyisocyanate(s) of a β-diketone compound, an aromatic polyisocyanate in amount to provide an isocyanate index of 80 to 130 and a non-mercury catalyst, wherein the reaction mixture is essentially devoid of mercury compounds, and b) curing the reaction mixture to form the syntactic polyurethane elastomer.