本文關鍵詞：導熱阻燃聚氨酯復合材料的制備　出處：《華南理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 聚氨酯 阻燃 導熱 氫氧化鋁 氧化鎂

【摘要】：電子產(chǎn)品領域中,產(chǎn)品向高集成度、高功率、高頻率的方向發(fā)展,對材料性能的要求越來越高,不僅要求良好的導熱性能,還要求良好的力學、阻燃、電絕緣、加工性能等。因而高分子材料越來越受關注。聚氨酯(PU)彈性體具有優(yōu)異的綜合性能,如強度較高、硬度范圍較寬、耐磨性優(yōu)異、耐疲勞性良好等,且性能可調(diào)程度大,特別適用于制備兼具多種優(yōu)異性能的高分子材料。本文通過分子設計合成了強度、硬度和耐熱性兼優(yōu)的PU,并通過填充不同的填料獲得良好的阻燃和導熱性能。這種材料制造成本較低、功能多樣,具有良好的市場發(fā)展前景。本文使用聚四氫呋喃二醇(PTMG)、聚醚多元醇4110(4110)、六亞甲基二異氰酸酯三聚體(HDI三聚體)和三乙醇胺(TEOA)合成了PU彈性體,研究了PTMG、4110和TEOA的用量對PU拉伸性能和硬度的影響,并討論了TEOA和4110的加入對PU熱性能的影響。當TEOA和4110的用量分別為醇類單體總量(TA-OH)的25 wt%和38wt%時,PU的強度、硬度和熱性能兼優(yōu),拉伸強度為27.2 MPa,沖擊不斷,邵D硬度為70°,5 wt%失重的溫度為306℃,且PU交聯(lián)密度較高,熱導率為0.272 W/(m·K),極限氧指數(shù)(LOI值)為25.1%,不能通過UL94 V-0級。采用磷酸和聚氧化丙烯三醇為原料,本文合成了聚氧化丙烯三醇磷酸酯(PPT-P),并用來改性氫氧化鋁(ATH)和氧化鎂(MgO),分別制備了ATH-P和MgO-P。PPT-P具有PU軟段結構,能明顯改善ATH和MgO與PU的相容性。填充量相同時,PU/ATH-P比PU/ATH具有更高的力學和阻燃性能,PU/MgO-P比PU/MgO具有更高的力學、導熱和阻燃性能以及熱性能。采用ATH-P為阻燃填料,填充量為40 vol%時,PU/ATH-P兼具良好的力學和阻燃性能,拉伸強度為23.8 MPa,能通過UL94 V-0級,但其導熱性能不佳。以MgO-P為導熱填料,填充量為45 vol%時,PU/MgO-P兼具良好的力學和導熱性能,拉伸強度為27.9MPa,熱導率為1.276 W/(m-K),但阻燃性能無法達到UL94 V-0級。為了制備兼具良好導熱和阻燃性能的復合材料,以ATH-P部分取代MgO-P。當MgO-P和ATH-P的填充量分別為30 vol%和15 vo1%時,PU/MgO-P/ATH-P的導熱和阻燃性能較好,熱導率為1.009 W/(m·K),可以通過UL94 V-0級。在此用量下,ATH-P和MgO-P具有協(xié)效導熱和阻燃作用。改變MgO的粒徑和形狀,可進一步提高PU/MgO-P/ATH-P的導熱性能,如采用形狀不規(guī)則和粒徑分布較寬的a-MgO-P代替片狀的MgO-P對,復合材料在通過UL94 V-0級的同時,其熱導率提高了34%,為1.356 W/(m·K)。
[Abstract]:In the field of electronic products, the development of products towards high integration, high power, high frequency, the requirements for material properties are becoming higher and higher, not only requires good thermal conductivity, but also requires good mechanical, flame retardant, electrical insulation. Pu) elastomer has excellent comprehensive properties, such as high strength, wide range of hardness, excellent wear resistance, good fatigue resistance and so on. Especially suitable for the preparation of polymer materials with many excellent properties. In this paper, pu with excellent strength, hardness and heat resistance was synthesized by molecular design. Good flame retardancy and thermal conductivity were obtained by filling different fillers. This kind of material has low cost, various functions and good market prospect. In this paper, PTMG is used. Pu elastomer was synthesized from polyether polyol (4110), hexamethylene diisocyanate trimer (hexamethylene diisocyanate trimer) and triethanolamine (PTMG). The effects of 4110 and TEOA contents on the tensile properties and hardness of pu. The influence of the addition of TEOA and 4110 on the thermal properties of pu was discussed. When the amount of TEOA and 4110 was 25 wt% and 38 wt% of the total alcohol monomer, respectively. The strength, hardness and thermal property of pu are excellent, the tensile strength is 27.2 MPa, the impact is constant, the temperature of weight loss of Shao D is 70 擄~ 5 wt%, and the crosslinking density of pu is high. The thermal conductivity is 0.272W / m 路KN, the limit oxygen index (loi) is 25.1and cannot pass through UL94 V-0. Phosphoric acid and polypropylene triol are used as raw materials. In this paper, polypropylene triol phosphate (PPT-PX) was synthesized and used to modify aluminum hydroxide (ATH) and magnesium oxide (MgO). ATH-P and MgO-P.PPT-P have soft segment structure of pu, which can obviously improve the compatibility of ATH and MgO with pu. PU/ATH-P has higher mechanical and flame retardant properties than PU/ATH. PUP / MgO-P has higher mechanical properties than PU/MgO. Thermal conductivity, flame retardancy and thermal properties. ATH-P was used as the flame-retardant filler with good mechanical and flame-retardant properties when the content of the filler was 40 vol%. The tensile strength is 23.8 MPA and can pass through UL94 V-0 grade, but its thermal conductivity is not good. When MgO-P is used as thermal conductive filler, the filling amount is 45 vol%. PU/MgO-P has good mechanical and thermal conductivity, tensile strength is 27.9MPa, thermal conductivity is 1.276W / m ~ (-1). But the flame-retardant property can not reach UL94 V-0 grade. In order to prepare composite material with good thermal conductivity and flame retardant property. MgO-P. was partially replaced by ATH-P. When the contents of MgO-P and ATH-P were 30 volt% and 15 vo1%, respectively. The thermal conductivity and flame retardancy of PU/MgO-P/ATH-P are better, and the thermal conductivity is 1.009 W / m 路KG, which can be passed through UL94 V-0 grade. ATH-P and MgO-P have synergistic heat conduction and flame retardant effect. Changing the diameter and shape of MgO can further improve the thermal conductivity of PU/MgO-P/ATH-P. If the a-MgO-P with irregular shape and wide particle size distribution is used to replace the flake MgO-P pair, the thermal conductivity of the composites increases by 34% while passing through the UL94 V-0 grade. It is 1.356 W / L 路KN.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ334;TB33

【引證文獻】

相關會議論文 前4條

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2 劉涼冰;;化學結構對聚氨酯彈性體熱分解的影響[A];中國聚氨酯工業(yè)協(xié)會第十四次年會論文集[C];2008年

3 齊文斌;李紹波;;高回彈澆注型聚氨酯彈性體的研制[A];中國聚氨酯工業(yè)協(xié)會第十次年會論文集[C];2000年

4 周文英;姜娜;韋永繼;姚慶倫;張永;王紅波;楊書濤;張利軍;李海生;;高硬度聚氨酯彈性體的研制[A];中國聚氨酯工業(yè)協(xié)會第十三次年會論文集[C];2006年

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本文編號：1410177