共查询到20条相似文献,搜索用时 93 毫秒
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双组分聚氨酯塑料清漆快干探讨 总被引:1,自引:0,他引:1
通过实验确定了有利于双组分聚氨酯塑料清漆加快固化的催化剂及其组合,在不影响涂膜性能和施工使用时间的前提下,适应不同烘烤温度和烘烤时间的塑料件涂装生产线。 相似文献
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氯化聚丙烯是聚丙烯的氯化改性产物,通过改性,其硬度、耐磨性、耐酸性、耐盐水性能比聚丙烯都好,耐热、耐老化性也优于聚丙烯。但其性能尤其是粘接性能还不能满足其在胶粘刺等方面的需要,为了进一步提高氯化聚丙烯的粘接性能,拓宽其应用领域,需对氯化聚丙烯改性。接枝共聚法是一种很好的化学改性方法。本文以丙烯酸(AA)作为接枝单体,以过氧化苯甲酰(BPO)为引发剂,以甲苯为溶刺,采用液相接枝共聚法,将丙烯酸单体接枝到氯化聚丙烯大分子链上,得到丙烯酸改性氯化聚丙烯产物。系统研究了反应温度、反应时间、引发剂过氧化苯甲酰用量和丙烯酸单体用量等因素对丙烯酸接枝改性的氯化聚丙烯产物粘接性能的影响,得出了较佳的工艺条件是反应温度T=100℃,反应时间t=3.5h,原料质量配比为100份氯化聚丙烯、3份丙烯酸和0.3份的过氧化二苯甲酰。研究还表明,丙烯酸改性的氯化聚丙烯的粘接性能优于氯化聚丙烯的粘接性能。 相似文献
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主要研究了甲基丙烯酸甲酯(PMMA)与氯化聚乙烯(CPE)力化学共聚物的力学性能和涂膜性能。结果表明:共聚物的抗张强度随CPE的氯含量及PMMA的含量的增加而增大;抗冲强度随CPE的氯含量的增加而降低,随PMMA的含量的增加而增大;共聚物的涂膜具有较好的光泽度及硬度。 相似文献
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论述了锂辉石对卫生瓷釉料性能的影响。实验表明:锂辉石的国入能显著降低釉料的熔融温度,拓宽其烧成范围,降低釉料的膨胀系数,改善坯釉结合性能,增加釉的流动性及光泽度,有助于乳浊力的提高。 相似文献
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本文针对聚丙烯(PP)粘合性差、较难染色、低温呈脆性、收缩率大等缺陷,采用溶液法对聚丙烯进行氯化改性,以AIBN(BPO)为引发剂,氯苯为溶剂,进行自由基引发接枝反应制取氯化聚丙烯(CPP)。通过滴定法得出氯化度的值,并对反应时间、反应温度、引发剂浓度等条件进行考察,得出最优氯化工艺条件,采用红外技术(FT-IR)对CPP加以表征,从溶解性能方面加以分析,进一步阐述了氯化度对其性能的影响。实验结果表明,该法可以得到氯原子的接枝产物,在反应温度120℃,反应时间5h时,CPP的氯化度最高可达52%,氯化度越高溶解度越高。 相似文献
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《现代塑料加工应用》2017,(4)
研究了成核剂、硫酸钡和偶联剂对聚丙烯(PP)性能的影响。采用正交试验,考察了润滑剂、降解剂、光亮剂和抗氧剂对PP光泽度的协同作用。结果表明:PP、硫酸钡、成核剂NX8000K、偶联剂、硬脂酸钙、降解剂、光亮剂、抗氧剂加入量分别为80.00,20.00,0.30,4.00,1.00,0.05,3.00,0.30份时,PP光泽度为最佳值(102°),达到了高光泽度的要求。 相似文献
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以CR20氯化橡胶、52度氯化石蜡、E-20环氧树脂和389-9长油度醇酸树脂为主要原料,制备出一种性能优良的氯化橡胶涂料,研究了氯化石蜡,环氧树脂和长油度醇酸树脂的用量对涂膜性能的影响。结果表明:加入52度氯化石蜡后,涂膜的柔韧性得到明显提高,但涂膜的硬度降低,表干时间延长,其适宜的用量为氯化橡胶的20%;389-9长油度醇酸树脂加入后,涂膜的光泽度、附着力、柔韧性和抗冲击性都有提高,但涂膜的耐盐水性和耐盐雾性有所下降,根据应用环境的不同,应适当控制其用量;E-20环氧树脂加入后涂膜的附着力有明显提高,但干燥时间有所延长,其适宜的用量为涂料总量的5%。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献