本文選題：長(zhǎng)玻纖增強(qiáng)聚丙烯 + 無(wú)鹵阻燃�。� 參考：《貴州大學(xué)》2015年碩士論文

【摘要】：本文較為系統(tǒng)地研究了熱氧老化對(duì)無(wú)鹵膨脹阻燃劑(IFR)、紅磷阻燃劑(RP)、協(xié)效阻燃體系(OMMT/IFR)阻燃長(zhǎng)玻纖增強(qiáng)聚丙烯(LGFPP)復(fù)合材料。針對(duì)膨脹阻燃劑在阻燃過(guò)程中以降低其力學(xué)性能達(dá)到阻燃等缺點(diǎn),利用協(xié)效阻燃體系減少阻燃劑用量,解決復(fù)合材料因阻燃劑添加量大導(dǎo)致力學(xué)性能降低的問(wèn)題。在人工加速熱氧老化條件下,利用動(dòng)態(tài)力學(xué)性能分析阻燃材料的動(dòng)力學(xué),對(duì)熱氧老化對(duì)長(zhǎng)玻纖增強(qiáng)聚丙烯復(fù)合材料無(wú)鹵阻燃體系的影響進(jìn)行一個(gè)較為系統(tǒng)的研究。熱氧老化對(duì)IFR/LGFPP阻燃體系的熱穩(wěn)定性無(wú)太大影響,但卻顯著降低了阻燃體系的起始分解溫度;隨著熱氧老化時(shí)間的延長(zhǎng),RP/LGFPP阻燃體系的Tmax呈現(xiàn)升高趨勢(shì),T5%卻呈現(xiàn)出先上升后下降的趨勢(shì);OMMT/IFR/LGFPP阻燃體系的熱穩(wěn)定性隨著熱氧老化處理時(shí)間的延長(zhǎng)呈現(xiàn)先增大后減小的變化,這與復(fù)合材料阻燃性能、燃燒性能的變化規(guī)律相對(duì)應(yīng)。隨著熱氧老化時(shí)間的延長(zhǎng),三種無(wú)鹵阻燃體系的LOI呈現(xiàn)先增大后減小的變化規(guī)律,IFR/LGFPP阻燃體系和RP/LGFPP阻燃體系的阻燃等級(jí)基本保持為FV-0級(jí)不變,OMMT/IFR/LGFPP阻燃體系的阻燃級(jí)別逐漸下降。IFR/LGFPP、OMMT/IFR/LGFPP阻燃體系經(jīng)過(guò)熱氧老化處理后,與未老化試樣相比,老化試樣的第一個(gè)PHRR較高;且隨著熱氧老化時(shí)間的延長(zhǎng),第一個(gè)PHRR值逐漸增加,MHRR和THR值呈現(xiàn)不斷增大的趨勢(shì)。而RP/LGFPP隨著熱氧老化時(shí)間的延長(zhǎng),試樣的TTI逐漸增加,PHRR值逐漸降低,MHRR和THR呈現(xiàn)不斷下降的趨勢(shì)。通過(guò)對(duì)錐形量熱儀燃燒測(cè)試殘余物的宏觀形貌圖分析可知,未老化試樣燃燒后形成黑色致密而均勻的殘留物。形成的碳層能阻隔燃燒熱向未燃部分的反饋以及分解產(chǎn)物向火焰區(qū)的擴(kuò)散燃燒,起到隔熱、隔質(zhì)作用,能夠有效地降低材料的熱釋放速率,延緩材料的燃燒。隨著熱氧老化時(shí)間的延長(zhǎng),試樣燃燒后形成的炭層顏色逐漸變淺,不致密并出現(xiàn)了較多裂紋,阻燃劑有從基體內(nèi)部向表面遷移的現(xiàn)象。隨著熱氧老化時(shí)間的推移,阻燃體系基體的結(jié)晶度減小,力學(xué)性能顯著下降。說(shuō)明分子量降低,發(fā)生了顯著的熱氧化降解。紅外光譜表明,隨著熱氧老化時(shí)間的延長(zhǎng),試樣表面會(huì)產(chǎn)生更多的生色基團(tuán)使材料發(fā)生黃變,說(shuō)明PP基體分子鏈發(fā)生了老化斷裂。PP基體分子鏈斷裂,以及長(zhǎng)玻纖與PP基體間發(fā)生界面脫黏是導(dǎo)致阻燃體系宏觀力學(xué)性能下降的主要原因。
[Abstract]:In this paper, the flame retarded long glass fiber reinforced Polypropylene (LGFPP) composites by thermo-oxygen aging for halogen-free intumescent flame retardants (IFRN), red phosphorus flame retardants (RPX) and synergistic flame retardant systems (OMMT / IFR) have been studied. In order to reduce the mechanical properties of intumescent flame retardants in the process of flame retardation, the synergistic flame retardant system is used to reduce the amount of flame retardants and to solve the problem that the mechanical properties of composites are reduced due to the large amount of flame retardants. The kinetics of flame retardant materials was analyzed by dynamic mechanical properties under the condition of artificial accelerated thermal oxygen aging. The effect of thermal oxygen aging on halogen-free flame retardant system of long glass fiber reinforced polypropylene composites was studied systematically. Thermal oxygen aging had little effect on the thermal stability of IFR/LGFPP flame retardant system, but significantly decreased the initial decomposition temperature of flame retardant system. With the prolongation of the aging time, the Tmax of RP- / LGFPP flame retardant system increased at first and then decreased with the increase of T5%. The thermal stability of OMT / IFR / LGFPP flame retardant system increased first and then decreased with the prolongation of thermal oxygen aging time. This corresponds to the change of the flame retardant and combustion properties of the composites. With the increase of thermal oxygen aging time, The LOI of the three halogen free flame-retardant systems increased first and then decreased. The flame-retardant grade of IFR / LGFPP and RP/LGFPP flame-retardant system remained basically unchanged as FV-0 grade. The flame-retardant grade of IFR / LGFPFP / OMFT / R / LGFPP flame-retardant system decreased gradually after thermal oxygen aging. The first PHRR of the aged sample is higher than that of the unaged sample, and the first PHRR value increases gradually with the increase of the thermal oxygen aging time. However, with the increase of thermal oxygen aging time, the TTI values of the samples gradually increased and the TTI values decreased gradually. The TTI and THR values of the samples decreased gradually with the increase of the thermal oxygen aging time. Based on the analysis of the macroscopic morphology of the residue from the combustion test with a cone calorimeter, it can be seen that after burning the unaged sample, the black dense and uniform residue is formed. The resulting carbon layer can block the feedback from the combustion heat to the unburned part and the decomposition product to the flame zone, which can effectively reduce the heat release rate of the material and delay the combustion of the material. With the increase of thermal oxygen aging time, the color of the carbon layer becomes lighter after burning, and there are many cracks in the carbon layer, and the flame retardant moves from the inside of the matrix to the surface. The crystallinity and mechanical properties of the flame retardant matrix decreased with the aging time. The results showed that the molecular weight decreased and the thermal oxidation degradation occurred significantly. The IR spectra show that with the increase of the aging time, more chromophore groups appear on the surface of the sample, which indicates that the PP matrix molecular chain has the aging fracture and the PP matrix molecular chain breaks. The interfacial debonding between long glass fiber and PP matrix is the main reason for the decrease of macroscopic mechanical properties of flame retardant system.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ327.1;TB33

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 趙旭,楊少鳳,趙敬哲,劉艷華,徐慧芳,王子忱;氧化鋅包覆超細(xì)二氧化鈦的制備及其紫外屏蔽性能[J];高等學(xué)�；瘜W(xué)學(xué)報(bào);2000年11期

2 王艷飛,肖衛(wèi)東,程新建,于莉;三嗪系列阻燃劑對(duì)丙烯酸系樹(shù)脂的阻燃化研究[J];合成樹(shù)脂及塑料;2003年03期

3 張建均;盧震宇;黃劍;王海龍;申屠寶卿;;氫氧化鎂包覆紅磷阻燃玻纖增強(qiáng)PA66的性能研究[J];塑料工業(yè);2011年08期

4 羅興;何敏;郭建兵;張凱舟;張道海;吳斌;;EG/IFR對(duì)長(zhǎng)玻璃纖維增強(qiáng)PP的協(xié)同阻燃作用[J];塑料科技;2014年02期

5 王慶國(guó),張軍,周宇,王許云;幾種熱塑性塑料的燃燒行為研究[J];中國(guó)塑料;2002年12期

，

本文編號(hào)：1800500