共查询到18条相似文献,搜索用时 140 毫秒
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使用Span-80、T-152、Span-80与改性磷脂、Span-80与T-152制备得到乳化基质和乳化炸药,通过储存时间和高低温循环法表征不同乳化基质和乳化炸药的稳定性,通过爆炸测试得到不同乳化炸药的爆速数据,研究了不同乳化剂对于乳化炸药稳定性和爆炸性能的影响。结果表明:复合乳化剂总是比单一乳化剂具有更好的乳化效果,复合乳化剂得到的乳化炸药稳定性和爆炸性能要明显高于单一乳化剂。 相似文献
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以油醇聚氧乙烯醚和马来酸酐为原料合成了油醇聚氧乙烯醚双子乳化剂(DOV-5),产物结构通过红外色谱和酸值测试进行了确征。通过低速分散机研究了其初乳性能,结果表明,在100 r/min的转速下,DOV-5的初乳性能优于失水山梨醇单油酸酯。采用白金环法测定了DOV-5对乳化炸药复合油相与硝酸铵水溶液的界面张力的影响,结果表明DOV-5可将油-水相的界面张力降低至0.28 mN/m,优于失水山梨醇单油酸酯(1.50 mN/m)。以DOV-5为乳化剂分别制备了乳胶基质和乳化炸药,考察了DOV-5对乳胶基质粒径、乳化炸药储存期和爆炸性能的影响,实验结果表明:DOV-5为乳化剂制备的乳胶基质的粒径为1.04μm,粒径分布均匀;敏化后的乳化炸药储存期达到310 d以上,爆炸性能优良,符合国家标准的要求。 相似文献
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通过测量乳胶基质硝酸铵析出量、乳化炸药爆速及乳胶基质黏度,研究了8种高分子酯类乳化剂在乳化炸药中的应用。实验结果显示,高分子酯类乳化剂在乳化炸药中具有较好的应用性能,乳化剂的乳化能力好于T152乳化剂;双头乳化剂制备的乳胶基质黏度比单头乳化剂大,更适宜化学敏化的乳化炸药。 相似文献
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乳化炸药是用乳化技术制备的油包水(W/O)型抗水工业炸药,乳化炸药的乳化效果、炸药爆轰性能和储存稳定性与乳化剂的品种和质量等有着密切联系。乳化剂的选择与乳化剂的HLB值、分子构成等因素有关。 相似文献
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本文首先采用失水山梨醇单油酸酯和马来酸酐为原料合成了失水山梨醇单油酸酯羧基衍生物,然后以失水山梨醇单油酸酯羧基衍生物与大豆磷脂为原料合成了大豆磷脂-失水山梨醇单油酸酯双子乳化剂(PC-SP).通过乳化力考察了PC-SP的动力学稳定性,结果表明PC-SP的动力学稳定性优于失水山梨醇单油酸酯.以PC-SP为乳化剂分别制备了乳胶基质和乳化炸药,考察了PC-SP对界面张力、乳胶粒径、储存期和爆炸性能的影响,实验结果表明:PC-SP具有较强的表面活性,可将硝酸铵水溶液-复合蜡的界面张力降低至0.65 mN/m,优于失水山梨醇单油酸酯(1.35 mN/m);以PC-SP为乳化剂制备的乳胶颗粒的粒径为1.05μm,粒径分布更均匀、细小;PC-SP为乳化剂制备的乳化炸药储存期达到240 d以上,爆炸性能优良,符合GB28286-2012标准的要求. 相似文献
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In this study, a series of (anionic and nonionic) emulsifiers were investigated to prepare acrylic pressure sensitive adhesives (PSA) with core‐shell structure by semicontinuous emulsion polymerization. The cloud point of different emulsifiers was characterized to explain the emulsifier effects on the emulsification ability. It was interestingly found that the hybrid emulsifiers (anionic coupling with nonionic) with optimized compositions could enhance the stability of emulsion system and improve the properties of PSA compared with the mono‐emulsifier. The stability of emulsion polymerization, the appearance of the emulsion system and the properties of PSA were studied in details by changing the proportion and the content of hybrid emulsifiers. When the ratio of sodium dodecyl sulfate (SDS: anionic emulsifier) to polyoxyethylene alkyl phenyl ether (OP‐10: nonionic emulsifier) reached 2 : 1, the content of hybrid emulsifiers reached 3 wt % and the reaction temperature was around 80°C, a better emulsion system was obtained in terms of comprehensive properties. At this condition, the synthesized PSA demonstrated the good holding power and 180° peel strength properties with fair tacky property, which was promising for industrial applications. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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In this article, a series of emulsifiers were investigated to prepare acrylic latex by seeded semi-continuous emulsion polymerization. The cloud point of nonionic emulsifiers was introduced to explain the emulsifier effects on the emulsification ability during changeable temperature. It was found that, under the same temperature and other experiment conditions, the hybrid emulsifiers (reactive coupling with anionic) could stabilize the pre-emulsion and latex very well. What was studied in detail was the stability of emulsion polymerization, the appearance of the emulsion system and other properties of latex film by changing the adding method, and content and proportion of hybrid emulsifiers. Water absorption of latex film was determined by the gravimetric method. When 2-acrylanmido-2-methylpropane sulfonic acid (AMPS) to sodium dodecyl sulfate (SDS) was less than 2:1, the content of the hybrids reached about 2–3% and when the pre-emulsifying used 2/3 of them, the copolymer emulsion was found to have excellent stability and small particle size with narrow distribution and its film to have low water absorption than those of the latex prepared with SDS alone. What is more, a small amount of hybrid emulsifier could achieve the same emulsification effect compared with SDS alone. And the chemical structure was characterized by Fourier transform infrared spectroscopy and differential scanning calorimetry. 相似文献
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采用间歇式预乳化聚合工艺,选用环保型阴非离子型乳化剂异构十三醇聚氧乙烯醚硫酸铵(DNS-525)和非离子乳化剂烷基醇聚氧乙烯醚(EFS-470)替代传统的烷基酚聚氧乙烯醚(APEO)乳化剂,并与交联单体复配成助剂1和助剂2。采用多因素正交小试实验考察三个因素(助剂1、保护胶体PVA1788、助剂2)对JS防水涂料用的苯丙乳液性能的影响,用FTIR对其结构进行表征。试验表明:新型复配乳化剂能大大提高乳液的稳定性,减少乳化剂的用量;助剂1对胶乳性能影响最大,助剂2次之,保护胶体PVA1788最小,并得到最佳的工艺参数;以此优化工艺参数为依据,制备出稳定性和涂膜弹性优异的苯丙乳液,该乳液和水泥粉料以1.4:1混合,制备出涂膜拉伸强度为2.1MPa,断裂伸长率为200%的高性能JS防水涂料。 相似文献
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反应型乳化剂对保护膜用丙烯酸酯乳液型压敏胶性能的影响 总被引:1,自引:0,他引:1
采用预乳化法制备了丙烯酸酯压敏胶乳液,探讨了不同乳化剂体系对压敏胶物理性能的影响。FTIR测试表明,反应型乳化剂参与了反应;TEM测试显示,反应型乳化剂体系所得乳液粒径小,分布均匀。实验结果表明:当w(复合乳化剂)=3%,m(ANPEO10)∶m(DNS-458)∶m(DNS-501)=1.5∶1.1∶0.4时,所得乳液的固体分质量分数为48.03%,单体转化率达到97.66%,乳液黏度为38.8 s,平均粒径为238 nm,压敏胶的初粘力能吸住8号钢球,持黏性大于24 h,180°剥离强度达到0.304 N/mm。贴在不锈钢表面的保护膜经80℃烘烤24 h后,不锈钢表面无残胶和雾影。 相似文献
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新型乳化剂对苯丙乳液性能的影响 总被引:3,自引:0,他引:3
采用半连续法制备苯丙乳液,通过改变乳化剂的种类和用量,比较了新型乳化剂烯丙氧基壬基酚聚氧乙烯(10)醚(ANPEO10)、烯丙氧基壬基酚聚氧乙烯(10)醚单磷酸(ANPEO10-p1)和聚氧乙烯-4-酚基醚硫酸铵盐(C0436)对乳液性能的影响。结果表明,用乳化剂ANPEO10制得的乳液冻融稳定性和聚合稳定性较好;而用ANPEO10-P1和CO436制得的乳液稀释稳定性较好;乳液的黏度随着乳化剂用量的增加而增大,且用ANPEO10-P1制得的乳液黏度相对较低;这3种乳化剂所制备的乳胶膜都具有良好的耐水性。 相似文献