Process for the preparation of Polyurethane material and Molded flexible Moulded Polyurethane Foam

摘要

A process for preparing Polyurethane material in a Mold which comprises the following steps: 1) applies an external Release Agent on at least the mold surfaces that will be in contact with the ingredients used for the preparation of Polyurethane material and / or e L finished Polyurethane material; 2) the ingredients used in the preparation of the material of PolyUrethane Mold are FED; 3) Let the ingredients react to form the Polyurethane material; (4) the Polyurethane material thus formed is separated from the Mould, and 5) 2, 3 and 4 are repeated at least 10 times without repeating Step 1, with the characteristic that at least 25% Weight of the ingredients used to make the material of PolyurethaneIn this calculation, excluding Water, if used, is a Polyester polyol having a functionality of 2 to 6, the equivalent Weight of 500 to 5000 and oxyethylene content of at least 50% by weight.A flexible Moulded Polyurethane Foam has an overall apparent density of 55 to 150 kg / m3, a Transmission of Vibration to the resonance frequency of a resonance frequency 1.5 to 3.2 3.5 Hz and a maximum hardness ILD (25%) of 15 to 25, and includes oxip oxyethylene groups and Ropileno in a Weight ratio of 1: 1 to 8: 1,In a number of oxyethylene groups and 25 to 80% by weight calculated on the weight of the Foam.