共查询到18条相似文献,搜索用时 156 毫秒
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讨论了影响聚氨酯硬质泡沫塑料强度的重要因素,并介绍了聚氨酯硬质泡沫塑料的增强技术,重点综述了混杂增强和纳米增强的研究进展。 相似文献
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硬质聚氨酯泡沫塑料力学性能与密度、增强剂含量的关系 总被引:4,自引:1,他引:3
探讨了硬质聚氨酯泡沫塑料的力学性能与密度、增强剂含量的特别是在较宽的密度和增强剂含量范围内对硬质聚氨酯泡沫塑料进行了应用研究,为其作为结构材料提供了依据。 相似文献
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通过对纯的和空心漂珠增强的硬质聚氨酯泡沫塑料的微观结构分析,探讨了泡沫体的微观行为和增强相的内在作用。实验结果表明:在既不增加生产成本又不影响产品密度的同时,后者可明显地提高泡沫材料的抗压性能和阻燃性,阐明了空心漂珠对硬质聚氨酯泡沫塑料的增强机理是对基体增强,而不是对泡沫体增强。 相似文献
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醇-磷酸酯法降解废旧聚氨酯的研究 总被引:2,自引:0,他引:2
选用不同的降解剂,采用醇-磷酸酯法降解废旧聚氨酯泡沫,对降解产物进行性能测试。结果表明:以一缩二乙二醇和磷酸三正丁酯为降解剂降解聚氨酯软质泡沫效果较好。以降解产物作为部分原料制备聚氨酯硬质泡沫塑料体,对其性能测试并与不加降解产物制备的聚氨酯硬质泡沫体比较,结果表明:降解产物作为部分原料对聚氨酯硬质泡沫塑料的性能影响不大。 相似文献
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用对苯二甲酸、苯酐、二元醇、三元醇等多元醇为原料制备新型芳香族聚酯多元醇,考察了聚酯多元醇酸值、羟值与其醇酸摩尔比的关系,以及酸值与反应时间的关系,并将其用于制备硬质聚氨酯泡沫塑料,讨论了新型聚酯多元醇对硬质聚氨酯泡沫塑料的性能影响。 相似文献
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头盔衬垫用聚氨酯泡沫塑料的制备与性能研究 总被引:1,自引:1,他引:0
介绍聚氨酯(PUR)泡沫塑料的制备原理,对硬质PUR泡沫塑料、半硬质PUR泡沫塑料和聚苯乙烯(PS)泡沫塑料的力学性能及其在不同环境条件下的性能变化进行对比分析,并对成型出的硬质和半硬质PUR泡沫塑料衬垫进行穿透和碰撞试验。结果表明,硬质PUR泡沫塑料的韧性较PS泡沫塑料高,强度较PS泡沫塑料低,但随着密度的增大,硬质PUR泡沫塑料的力学性能与PS泡沫塑料的差距减小;PUR泡沫塑料的耐环境性优于PS泡沫塑料;硬质和半硬质PUR泡沫塑料衬垫的抗穿透性能和碰撞性能满足GJB1564—1992的技术要求,PUR泡沫塑料可以取代PS泡沫塑料用于飞行员头盔衬垫。 相似文献
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Zhen‐Guo Yang Bin Zhao Sang‐Lu Qin Zheng‐Fei Hu Zhong‐Kao Jin Jian‐Hua Wang 《应用聚合物科学杂志》2004,92(3):1493-1500
The mechanical properties of hybrid reinforced rigid polyurethane (PU) foams were investigated with the reinforcing agent SiO2 and fibers. The effect of content of SiO2 and fibers and the effect of length of fibers on the properties of the PU composite foam were emphatically analyzed. The experiment results show that the tensile strength of the PU composite foam is optimal when the content of SiO2 and glass fiber is 20 and 7.8%, respectively. Furthermore, the reinforcing effect of glass fiber, Nylon‐66 fiber, and PAN‐matrix carbon fiber were compared and the results show that the tensile strength of the PU composite foam reinforced with 3–5% carbon fiber is optimal. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1493–1500, 2004 相似文献
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The method of boroorganic compounds preparation by esterification of boric acid and glycols has been presented. The obtained compounds tri(2‐hydroxybutyl)borate, tri(hydroxythiodiethylene)borate, tri[(3‐chloro‐2‐hydroxy‐1‐propoxy)‐1‐methylpropyl]borate, and tri[3‐chloro‐2‐hydroxy‐1‐propoxy)thiodiethyl]borate were used to produce the rigid polyurethane–polyisocyanurate (PUR‐PIR) foams. The foams were prepared by one‐stage method and the amount of borates added varied, within the range from 0.0 to 0.4 of chemical equivalent. The method of preparation, determination of foaming parameters, and methods of testing of the physicochemical properties of PUR‐PIR foams as well as their results have been presented. A special emphasis was put on reduction of the foam flammability. It was found that application of the obtained compounds as polyolic components has a favorable effect on the properties of the produced rigid PUR‐PIR foams. The obtained rigid PUR‐PIR foams were characterized by a higher compressive strength, lower brittleness, considerably reduced flammability, and higher content of the closed cells. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2020–2029, 2006 相似文献
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改性黄麻纤维增强聚氨酯硬泡性能的研究 总被引:2,自引:0,他引:2
采用碱处理工艺对黄麻纤维进行了表面改性,提高了纤维对基体树脂的浸润性,改善了纤维与树脂基体的界面粘结。研制了一种新型的黄麻纤维增强硬质聚氨酯结构泡沫材料。测试结果发现,碱处理后纤维表面出现沟槽和裂纹,拔出的单丝纤维表面包覆有聚氨酯基体,纤维与基体结合紧密。压缩性能实验结果表明,添加改性纤维的复合材料,其压缩强度明显提高,当纤维质量分数为3.0%时,复合材料的压缩强度达到最大值(8.01 MPa);纤维质量分数为3.0%、长度为3 mm的短切纤维的增强效果较好;随着纤维含量和长度的增加,复合材料的压缩模量亦随之增大。 相似文献