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摘要
采用丁醇改性密胺树脂为原料,使用烘箱发泡制备以钠基蒙脱土(Na+-MMT)、二甲基二氯硅烷表面处理的气相白炭黑、微米及纳米白炭黑为异相成核剂的新型硬质密胺泡沫复合材料。利用扫描电镜对泡孔微观结构进行观察,并使用万能试验机、氧指数仪、导热系数仪等对泡沫性能进行了表征。结果表明:成核剂种类对泡孔形貌影响较大,纳米白炭黑成核效果最好,不仅可以作为增强填料提高泡沫力学性能,还可以改善泡孔结构降低泡孔尺寸进而影响泡沫体宏观性能。当纳米白炭黑添加量为三聚氰胺质量的1%时,所得密胺泡沫复合材料的综合性能最佳,泡孔平均直径从240μm降低至160μm,压缩强度达到252.2kPa,吸水率与导热系数分别降低了67.6%和11.9%,氧指数为32.5%。
Abstract
A new type of rigid melamine foam composite material was synthesized by oven foaming with butanol-modified melamine resin used as raw material,sodium-based montmorillonite (Na+-MMT) and fumed silicad was treated with dimethyldichlorosilane,micron and nano-silica used as phase nucleating agent.Scanning electron microscope was used to observe the cell microstructure,and the foam performance was characterized by universal testing machine,oxygen index meter,thermal conductivity meter,etc.The results shown that the type of nucleating agent had greater impact on the cell morphology,and nano-silica had the best nucleation effect.It can not only be used as a reinforcing filler to improve the mechanical properties of the foam,but also can improve the cell structure and reduce the cell size,Thereby affecting the macroscopic properties of the foam.When the addition amount of nano-silica was 1% of the mass of melamine,the overall performance of the obtained foam was the best.The average cell diameter was reduced from 240μm to 160μm,the compressive strength reached 252.2kPa,the water absorption and thermal conductivity were reduced respectively with 67.6% and 11.9%,the oxygen index was 32.5%.
关键词
硬质密胺泡沫
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异相成核剂
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纳米白炭黑
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泡孔微观结构
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泡沫性能
Key words
rigid melamine foam
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heterogeneous nucleating agent
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nano silica
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cell microstructure
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foam performance
成核剂对硬质密胺泡沫泡孔结构及性能的影响[J].
化工新型材料, 2022, 50(3): 179-184 DOI:10.19817/j.cnki.issn1006-3536.2022.03.036
[1] 王东卫,张潇娴,罗嵩,等.密胺泡沫的制备改性及性能研究[J].功能材料,2012,43(24):3381-3385.
[2] Li C,Ma H,Zhou Z,et al.Preparation and properties of melamine-formaldehyde rigid closed-cell foam toughened by ethylene glycol/carbon fiber[J].Cellular Polymers,2020:1908020229.
[3] 王雪帆,马海红,宋聪强,等.高强度硬质阻燃密胺泡沫材料的制备与性能[J].高分子材料科学与工程,2019,35(2):153-159.
[4] 李文环,张金杰,杨从太,等.苯代三聚氰胺增韧改性三聚氰胺树脂的制备及光谱分析[J].光谱学与光谱分析,2018,38(5):1481-1485.
[5] Lee L J,Zeng C,Cao X,et al.Polymer nanocomposite foams[J].Composites Science and Technology,2005,65(15):2344-2363.
[6] Okolieocha C,Köppl T,Kerling S,et al.Influence of graphene on the cell morphology and mechanical properties of extruded polystyrene foam[J].Journal of Cellular Plastics,2015,51(4):413-426.
[7] Zhang L,Jeon H K,Malsam J,et al.Substituting soybean oil-based polyol into polyurethane flexible foams[J].Polymer,2007,48(22):6656-6667.
[8] Gong P,Buahom P,Tran M,et al.Heat transfer in microcellular polystyrene/multi-walled carbon nanotube nanocomposite foams[J].Carbon,2015,93:819-829.
[9] Seo W J,Sung Y T,Kim S B,et al.Effects of ultrasound on the synthesis and properties of polyurethane foam/clay nanocomposites[J].Journal of Applied Polymer Science,2006,102(4):3764-3773.
[10] 葛铁军,王佳,肖尚雄.成核剂对酚醛泡沫微观结构及性能的影响[J].塑料科技,2016,44(11):41-46.
[11] 葛铁军,杨潇.成核剂含量对酚醛泡沫性能的影响[J].沈阳化工大学学报,2015,29(1):23-27.
[12] 李茹,张军.聚氨酯／蒙脱土复合阻燃硬质泡沫材料的研究[J].中国塑料,2005(8):21-26.
[13] 黄瑞娇,应宗荣,张顺,等.蒙脱土-稻壳复合聚氨酯硬质泡沫的研究[J].化工新型材料,2015,43(1):151-152,155.
[14] Sundarram S S,Li W.On thermal conductivity of micro- and nanocellular polymer foams[J].Polymer Engineering & Science,2013,53(9):1901-1909.
基金资助
合肥工业大学大学生创新创业训练计划项目(X202010359218)
