| 摘要 |
<p>A polyurethane foam produced by the reaction of a polyisocyanate and a polyether polyol in the presence of a catalyt, a cell regulating agent and water as a blowing agent, the polyether polyol of which consists of a halogenated polyether polyol (I) of the general formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="17" wi="64" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>[wherein x is a number of 0 to 7; y is a number of 2 to 3; A is a saturated or unsaturated, brominated polyol residue having a number of functional groups of y; R is hydrogen or an alkyl group having 1 to 5 carbon atoms] and (II) a polyether polyol having a number of functional groups of 2 to 8, a weight ratio of the added amounts of propylene oxide and ethylene oxide within the range of about 75 to 95/25 to 5 and a hydroxyl number of about 20 to 100 mgKOH/g, whereby a weight ratio of (I) to (II) is about 95 to 25/5 to 75 and the amount of water is about 5 to 20 parts by weight against 100 parts by weight of the polyol component.</p><p>The polyurethane foam has uniform and open cells and shows excellent physical properties in compressive strength, tensile strength, excellent sound absorption characteristics and flame resistance, and is therefore used as thermal insulation materials, acoustic absorption materials and shock absorption materials for houses, vehicles, etc.</p> |
