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首页> 外文期刊>Journal of Applied Polymer Science >Hydraulic resistance of rigid polyurethane foams. I. Effect of different surfactants on foam structure and properties
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Hydraulic resistance of rigid polyurethane foams. I. Effect of different surfactants on foam structure and properties

机译：硬质聚氨酯泡沫的耐水压性。一，不同表面活性剂对泡沫结构和性能的影响

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摘要

Foams used in buoyancy applications must resist penetration by water at significant depths of immersion. The behavior of water blown rigid polyurethane foam at different water pressures from 0 to 3 MPa are studied in this work. The effects of different surfactants on the cell structure and hydraulic resistance of the foams are examined. The foams have densities in the range of 145 to 160 kg /m(3). With increasing applied hydraulic pressure, it is found that the foams have very small buoyancy losses at low pressures but beyond a threshold pressure, buoyancy losses increase rapidly. The threshold pressures of the foams increase with decrease in cell window area. A cell window is the lamella of the foam material that separates two adjacent cells. The cell sizes of the foam are found to correlate with the size of the air bubbles entrained during initial mixing. Surfactants, which reduce the surface tension of the polyol to the greatest extent, are found to give the finest initial bubbles, smaller cells, and foams with the highest hydraulic resistance. (C) 2004 Wiley Periodicals, Inc.
机译：用于浮力应用的泡沫必须在很大的浸入深度下抵抗水的渗透。这项工作研究了水硬质聚氨酯泡沫在0至3 MPa不同水压下的行为。考察了不同表面活性剂对泡沫的泡孔结构和耐水压性的影响。泡沫的密度范围为145至160 kg / m（3）。随着施加的液压压力的增加，发现泡沫在低压下具有非常小的浮力损失，但是超过阈值压力时，浮力损失迅速增加。泡沫的阈值压力随着孔窗口面积的减小而增加。孔窗是将两个相邻孔分隔开的泡沫材料的薄片。发现泡沫的孔尺寸与在初始混合期间夹带的气泡的尺寸相关。发现可最大程度降低多元醇表面张力的表面活性剂可产生最细的初始气泡，较小的泡孔和具有最高耐水压性的泡沫。 （C）2004年Wiley Periodicals，Inc.

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