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非溶剂型输送带修补胶的研制及应用 总被引:2,自引:1,他引:1
采用本体聚合法,在非溶剂体系下液态丁二烯,环氧树脂和聚酯型聚氨基甲酸酯预聚体通过接枝,交联,生成了一种高强度的柔性修补胶,用于橡胶覆盖面的输送带的破损修复和其它橡胶制品的修补,克服了溶剂型产品对环境的污染和操作人员的身体伤害。 相似文献
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为减少对钢水的增磷,以电熔镁砂颗粒为骨料,电熔镁砂细粉、Cr_2O_3粉、SiO_2微粉为基质,制备了转炉出钢口镁质修补料。分别研究了8种减水剂(三聚磷酸钠STP、六偏磷酸钠SHP、聚丙烯酸钠SPA、醚基聚羧酸酯类减水剂FS10、聚羧酸减水剂FS65、氨基磺酸盐减水剂SN-Ⅱ、β-萘系磺酸盐甲醛缩合物FDN和氨基磺酸盐类减水剂HDS-1)及FS65的外加量(质量分数分别为0.1%、0.2%、0.3%、0.4%、0.5%、0.6%和0.7%)和SiO_2微粉的加入量(质量分数分别为1%、3%、5%和7%)对修补料性能的影响。结果表明,以93.5%(w)的电熔镁砂、5%(w)的SiO_2微粉、1.5%(w)的Cr_2O_3粉,外加0.3%(w)的减水剂FS65和0.1%(w)的悬浮剂制备的镁质修补料性能最好。该修补料在多家钢厂300 t转炉上进行使用,其寿命可以保持与出钢口同步,大于100炉,完全满足冶炼要求。 相似文献
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本世纪50年代初,聚氨酯材料由修补骨裂缝的应用发展到血管外科手术缝合修补外涂层上。由于聚氨酯材料有很好的“生物相容性”和“抗血栓性”,并有优异的物理机械性能,在50年代末与60年代初,人们在研制人造心脏左心房分流泵的泵腔方面获得了很好的临床效果。国际假肢行业在聚氨 相似文献
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结合胶是未硫化的混炼胶中不能被其良溶剂溶解的那部分橡胶。用化学溶剂法制备结合胶具有药品用量小、实验过程操作简单,重现性好等优点。通过讨论橡胶加入量、炭黑用量、反应时间、静置时间等因素,确定了溶剂法制备结合胶的最佳工艺参数,并与混炼法制备的结合胶进行了性能对比。结果表明,橡胶在甲苯溶液中的质量浓度约为0.02g/mL、橡胶和炭黑的质量比为2∶1、反应时间为14h、静置时间为72h的工艺参数下,可以制得高质量结合胶。混炼法制备的结合胶的质量比溶剂法制备的结合胶的质量大。但是其具有与溶剂法结合胶相同的抽提温度曲线,在结合胶的实验研究中,可以用溶剂法代替混炼法。 相似文献
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耐溶剂热稳定型抗冲击聚苯乙烯的研制 总被引:2,自引:0,他引:2
用自由基接枝共聚法研制了耐溶剂热稳定型抗冲击聚苯乙烯(IPS),并研究了环氧化聚丁二烯橡胶对IPS性能的影响。研究发现,适当提高环氧化聚丁二烯橡胶的用量,可使IPS的冲击性能达到高冲击级,而且这种IPS的耐溶剂和热稳定性能有显著提高。 相似文献
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High‐impact polystyrene (HIPS) was prepared by the bulk or low‐solvent polymerization of styrene in the presence of dissolved rubber and characterized to measure the dispersed particle size of the rubber phase. Before preparation, the prepolymerization time was established by measuring the evolution of particle size distribution of the dispersed phase as a function of reaction time. The measurement technique by laser light scattering was found to be efficient enough not only to lead to the right prepolymerization time but also to predict rubber‐phase particle size distribution. Polymerization experiments were then conducted to investigate the effect of solvent contents on the particle size distribution of the rubber phase, in which ethylbenzene was introduced as a solvent at levels of 0, 3, 10, and 15%. As the solvent content increased, the size of rubber‐phase particles initially increased, reaching a maximum, and then decreased. It is speculated that a decrease in the molecular weight of the matrix, a decrease in the viscosity ratio between polybutadiene to polystyrene phases, and a change in rubber morphology all contributed to the change in the rubber particle size of HIPS. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3672–3679, 2003 相似文献
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镍系顺丁橡胶通过聚合反应后,胶液中胶的质量分数为18%左右,82%(质量分数)左右的溶剂(也可称为溶剂油)和未反应的丁二烯通过凝聚系统蒸出,需要消耗大量的蒸汽.本文设计胶液的闪蒸流程,用闪蒸技术对胶液进行处理,使胶液中的胶含量提高到22%,减少了凝聚和回收处理溶剂油的蒸汽消耗,每吨橡胶节约蒸汽为0.455 t,也可缓解凝聚和回收的生产负荷,降低凝聚过程中的胶中含油. 相似文献
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介绍了以溶剂油为载热体的甲基氯硅烷水解物裂解技术原理、工艺流程、产业化过程和效果.通过用溶剂油为载热体进行水解物裂解及混合环硅氧烷精馏,生产出聚合物中间体八甲基环四硅氧烷(D4),该产品用于合成高温硫化硅橡胶、室温硫化硅橡胶、硅油等. 相似文献
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Rubber composites are composed of rubber(s), reinforcing filler(s), crosslinking agents, antidegradants, and processing aids. Organic materials with low molecular weight can migrate to the surface of the rubber composite and get accumulated on the surface. The bloomed materials make the appearance worse and contaminate the surroundings. It is not easy to collect successfully the bloomed materials without damage to the sample. The collecting methods of scratching with a polished glass, heating with an iron, scrubbing with solvent‐soaked cellulose tissue, and scrubbing with solvent‐soaked melamine foam were compared. The collected materials were analyzed using gas chromatography/mass spectrometry (GC/MS). The scrubbing with solvent‐soaked melanine foam or with solvent‐soaked cellulose tissue was found to be recommendable. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1260–1264, 2007 相似文献
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溶液共混法笼状硅氧烷低聚物/硅橡胶复合材料的分散性 总被引:1,自引:0,他引:1
通过溶液共混法制备了笼状硅氧烷低聚物(POSS)/硅橡胶复合材料,用X射线衍射仪和透射电子显微镜研究了该材料的分散状况,考察了POSS质量分数以及烘干温度、溶剂含量对POSS在硅橡胶中分散状况的影响。结果表明,POSS质量分数越低,烘干温度越高,越有利于抑制POSS的结晶.进而有利于制备POSS精细分散的P0ss/硅橡胶复合材料;而溶剂含量越少时,更多的POSS以晶体形式从溶剂中析出,从而使得POSS的结晶程度更显著。 相似文献