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首页> 外文期刊>Journal of Applied Polymer Science >Processing-structure-property relationship in rigid polyurethane foams
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Processing-structure-property relationship in rigid polyurethane foams

机译：刚性聚氨酯泡沫中的加工结构性质关系

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摘要

Rigid polyurethane (PU) foam is used as a thermal insulating and supporting material in domestic refrigerator/freezers and it is produced by reaction injection molding (RIM) process. There is a need to improve the thermal property of rigid PU foam but this is still a challenging problem. Accordingly, this work investigates the RIM process parameters to evaluate their effects on rigid PU foam's structure and hence property. It has been found that mold temperature is a key parameter whereas curing time has negligible effect on structure of PU foam. Cell size, strut thickness, and foam density have been found very critical in controlling the thermal and mechanical properties. Upper and lower values of 30 to 32 kg/m(3) density are critical to observe contribution of radiation and solid conductivity separately. Finally, PU foam with 160 mm average cell size, 16 mm strut thickness, below 10% open cell content, and 30 to 32 kg/m(3) density allow obtaining better thermal insulation without significant reducing in the compressive strength. The presented work provides a better understanding of processing-structure-property relationship to gain knowledge on producing highquality rigid PU foams with improved properties. (C) 2017 Wiley Periodicals, Inc.
机译：刚性聚氨酯（PU）泡沫用作家用冰箱/冰箱中的热绝缘和支撑材料，并通过反应注塑（RIM）工艺产生。需要改善刚性PU泡沫的热特性，但这仍然是一个具有挑战性的问题。因此，该工作调查了RIM工艺参数，以评估它们对刚性PU泡沫结构的影响和属性。已经发现，模具温度是关键参数，而固化时间对PU泡沫结构具有可忽略不计的影响。在控制热和机械性能方面，已经发现细胞尺寸，支柱厚度和泡沫密度非常关键。上部和较低值30至32kg / m（3）密度对于观察辐射和固体电导率的贡献是至关重要的。最后，PU泡沫具有160毫米的平均电池尺寸，16mm支柱厚度，低于10％的开孔含量，30至32kg / m（3）密度允许获得更好的隔热，而不明显降低抗压强度。本工作提供了更好地理解加工结构 - 财产关系，以获得有关生产高度刚性PU泡沫的知识，具有改进的性能。 （c）2017 Wiley期刊，Inc。

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