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羟基硅油对无卤阻燃HDPE的改性 总被引:4,自引:0,他引:4
用氧氧化镁(MH)和水合硼酸锌(ZB)无卤阻燃高密度聚乙烯(HDPE)。测试了试样的拉伸强度、弹陛摸量、断裂伸长率、氧指数、维卡软化点。针对无卤阻燃体系韧性下降很大的缺点.采用羟基硅油进行增韧。结果表明:1000份MH和10份ZB可使体系氧指数达到28.0%,但同时韧性大幅下降,加入6份羟基硅油可在一定程度上改善材料的韧性 相似文献
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选用热塑性聚氨酯(TPU)作为基材,通过添加无卤阻燃剂、润滑剂熔融共混制备高耐磨无卤阻燃TPU护套材料。采用力学性能测试、UL94垂直燃烧测试、极限氧指数测试、熔融指数测试、耐磨耗测试等研究了无卤阻燃TPU护套材料的力学性能、阻燃性能与耐刮磨性能。结果表明:相比于单纯氮系阻燃剂,磷氮复配阻燃剂在实现较高力学性能基础上提高了材料的阻燃性能;添加硅酮、羟基硅油均能改善阻燃TPU材料的磨耗性能,羟基硅油因其反应性在改善材料耐磨性能的同时也提高了力学性能。采用磷氮复配阻燃剂、羟基硅油作为润滑剂制备的阻燃TPU护套材料制备的拖链线缆通过VW-1阻燃、刮磨等测试,达到了高速拖链线缆用高耐磨无卤阻燃TPU护套材料开发要求。 相似文献
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橡胶表面用无卤协同阻燃聚氨酯脲的性能研究 总被引:1,自引:0,他引:1
以HDI三聚体/IPDI预聚体为固化剂,聚天门冬氨酸酯为扩链剂,烷羟基硅油/氮磷羟基阻燃聚醚POP(Si-N/P)与聚磷酸铵(APP)/季戊四醇(PER)为协同阻燃剂,设计了橡胶表面用无卤协同阻燃聚氨酯脲弹性体。讨论了协同阻燃剂用量对体系阻燃与机械性能的影响。结果表明,无卤协同阻燃聚氨酯脲弹性体具有较好的阻燃性能和机械性能,当Si—N/P质量分数为20%,APP/PER质量分数为30%时,其极限氧指数(LOI)从18提高到33,拉伸强度5.2MPa,断裂伸长率235%.邵A硬度57,可实现与橡胶基材匹配的协同运动。 相似文献
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选用丙烯腈-丁二烯-苯乙烯(ABS)高胶粉(ABSHR)和丁腈橡胶(NBR)对苯并噁嗪(BOZ)/磷酸三苯酯(TPP)/ABS无卤阻燃体系进行增韧改性;探讨了增韧剂对ABS无卤阻燃体系的阻燃性能和力学性能的影响;同时采用扫描电镜(SEM)对其断面形态进行表征。结果表明:ABSHR添加量为10份时,体系的冲击强度提高了35%,其拉伸强度和氧指数影响较小;NBR添加量为10份时,体系的冲击强度从4.62 kJ/m2提高到26.3 kJ/m2,提高了469%。体系的拉伸强度和氧指数有所下降。DMA显示在丁腈橡胶增韧的体系中,苯并噁嗪树脂的Tg与ABS高胶粉增韧体系相比向低温方向移动了4.6℃。 相似文献
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以高聚合度聚磷酸铵(APP)为酸源,聚酰胺6(PA6)和改性PA6(MPA6)为炭源,4A分子筛为协效剂,对ABS进行无卤阻燃研究,考察了各试样的氧指数、热失重行为和炭层形貌,同时选用MPA6和乙烯-丙烯酸乙酯-甲基丙烯酸缩水甘油酯三嵌段共聚物(E-MA-GMA)弹性体对阻燃材料进行增韧改性。结果表明:APP/成炭剂PA6及其协效剂4A分子筛组成的无卤阻燃体系能显著改善了ABS树脂的阻燃性能,氧指数达到32%,UL94测试达到V-0级。在此基础上,采用MPA6和E-MA-GMA弹性体改性ABS,复合材料仍然保持较高的阻燃性能,拉伸强度略有下降,缺口冲击强度从3.11 kJ/m2提高到4 kJ/m2。 相似文献
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超细氢氧化镁粉的表面改性 总被引:8,自引:0,他引:8
超细活性氢氧化镁是一种重要的环保型阻燃材料。本文通过使用2种钛酸酯(JN-201和JN—101)和1种含H硅油(202)对超细氢氧化镁粉进行了表面改性,通过对改性前后粉体的活化指数来预先评价改性效果。对改性前后粉体进行了SEM、FTIR分析.研究了粉体改性的机理。结果表明.使用钛酸酯JN—101和含H硅油改性可以有效提高粉体的活化指数,而钛酸酯JN-201则不行。SEM和FTIR分析表明.使用钛酸酯JN—101和含H硅油可以提高氢氧化镁粉在干燥状态下的分散性,钛酸酯JN—101与氢氧化镁粉体表面为化学吸附,而含H硅油与氢氧化镁粉体表面为物理吸附。 相似文献
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羟基硅油对Mg(OH)2高填充HDPE力学性能的影响 总被引:20,自引:1,他引:19
研究了超细Mg(OH)2填料用量、填料表面改性、羟基硅油用量等对于高填充高密度聚乙烯(HDPE)力学性能的影响。当超细Mg(OH)填料用量达到70份时,HDPE复合材料表现出明显的脆性拉伸断裂行为,用硅烷偶联剂物钛酸酯对超细Mg(OH)2填料进行表面改性,能提高高填充HDPE的拉伸强度,而对于断裂伸长率的影响较小,羟基硅油能有效改善高填充HDPE的韧性。在140份的高填充量下,用羟基硅油处理钛酸酯 相似文献
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研究了纳米碳酸钙(CaCO3)和无卤阻燃剂六苯氧基环三磷腈(POP)对聚丙烯(PP)/氢氧化镁(Mg(OH)2)复合材料力学性能和燃烧性能的影响。结果表明:保持无机粒子总量90份,随着纳米 CaCO3含量的增加,材料的力学性能先提高后降低,在其含量为40份时达到最佳值。POP 的加入可减少 Mg(OH)2用量,同时可进一步提高 PP/Mg(OH)2复合材料的力学性能和阻燃性能,当 POP 用量为8份时,复合材料的断裂伸长率、拉伸强度、冲击强度和氧指数分别可达264.76%、22.34 MPa、48.65 kJ/m~2、28.2%。 相似文献
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Four types of magnesium hydroxide with different particle and crystallite sizes and different degrees of agglomeration were added at amounts up to 60% by weight to polypropylene to obtain a series of composites. The burning characteristics, tensile yield strength, flexural modulus, notched Izod impact strength, and melt flow index of the resulting composites were measured. Magnesium hydroxide coated with sodium stearate was found to give an increased melt flow index and impact strength to the composites as compared to values obtained with uncoated magnesium hydroxide. Incorporation of not less than about 57% by weight of magnesium hydroxide made the composite nonflammable, but at the same time considerably reduced its impact, flexural, and tensile yield strengths. As the amount of magnesium hydroxide filler was increased, the tensile yield strength and flexural strength of the composite proportionally decreased while the flexural modulus increased. The impact strength reached a maximum value when the amount of incorporation was 30% by weight. The lower the degree of agglomeration of the magnesium hydroxide filler and the greater the crystallite size within the range to about 2μm, the better were the mechanical properties of the composite. 相似文献
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Facile synthesis of silicone‐toughened unsaturated polyester by hydroxyl‐terminated silicone copolycondensation
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A facile method is developed to synthesize silicone‐toughened unsaturated polyester (SUP‐M) by monomer copolymerization of anhydrides and diols with hydroxyl‐terminated silicone. The structures and molecular weights of the SUP‐M resins were characterized by Fourier transform infrared spectroscopy and gel permeation chromatography, respectively. The gelation time and mechanical properties, including impact strength, flexural strength, and tensile strength, were investigated. The fracture behaviors were studied by scanning electron microscopy, and their glass‐transition temperature and storage modulus were measured by dynamic mechanical analysis. The experimental results showed that the impact strength of SUP‐M can be obviously improved through copolymerization with a small amount of silicone without decreasing its mechanical properties. The impact strength, flexural strength, and tensile strength of SUP‐M‐0.5 are as high as 12.5 KJ m?2, 131 MPa, and 59 MPa, which are increased by 76.1%, 21.2%, and 6.7%, respectively, compared with those of unsaturated polyester. Impacts on SUP‐M with low silicone content produce a large number of evenly and regularly distributed continuous narrow crack bands combined with many evenly distributed branching crazes, which are of great benefit in absorbing a large amount of impact energy. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45562. 相似文献
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影响HTV硅橡胶撕裂强度的因素 总被引:2,自引:0,他引:2
考察了白炭黑种类、羟基硅油用量、含氢硅油用量以及不同乙烯基含量生胶并用对热硫化(HTV)硅橡胶撕裂强度的影响。结果显示,气相法白炭黑的补强效果强于沉淀法白炭黑,且比表面积越大,硅橡胶的撕裂强度越高;随着羟基硅油加入量的增加,硅橡胶的撕裂强度先增后趋于稳定;含氢硅油的用量对HTV硅橡胶的撕裂强度基本没有影响;高乙烯基含量生胶和低乙烯基含量生胶并用能显著提高HTV硅橡胶的撕裂强度。较佳配方是:166 g 110-0生胶,4 g 112生胶、80 g QS-102气相法白炭黑、8.5 g羟基硅油、1.0 g含氢硅油、0.5 g乙烯基硅油,此时,HTV硅橡胶的撕裂强度达到21 KN/m。 相似文献