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在锦纶66浸胶帘子布的生产过程中,浸胶液调配工艺会影响帘子布胶斑的形成。探讨了浸胶液调配中其组成物料含量、催化剂、物料混合顺序以及浸胶液p H值对帘子布胶斑的影响,利用产品缺陷智能检测系统和千米胶斑面积表征胶斑。结果表明:减小浸胶液中天然胶乳的含量,采用酚醛预聚树脂替代间苯二酚和部分甲醛,使用氢氧化钠作催化剂,在间苯二酚或酚醛预聚树脂与甲醛混合之前加入胶乳溶液,降低浸胶液p H值,可减少帘子布的千米胶斑面积;浸胶液的机械稳定性与帘子布的千米胶斑面积呈正相关性,可替代帘子布千米胶斑面积用于浸胶液的调配。 相似文献
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使用一浴浸胶机生产尼龙66浸胶帘子布,从工艺和设备两方面分析生产过程中帘子布表面产生胶斑的原因,探讨挤压辊空气弹簧压强、无挤压辊的浸胶区结构、刮布线数量、单/双面吸嘴等因素对浸胶帘子布千米胶斑面积的影响。结果表明:在尼龙66浸胶帘子布生产中,减小挤压辊空气弹簧压强或使用无挤压辊的浸胶区结构、增加刮布线数量、使用双面吸嘴替代单面吸嘴,均有利于减小浸胶帘子布的千米胶斑面积;综合使用无挤压辊的浸胶区结构、刮布线6根和双面吸嘴,生产的尼龙66浸胶帘子布表面胶斑显著减少,千米胶斑面积仅为0.9 cm~2。 相似文献
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<正> 锦纶大、小胎浸胶帘子布评优会议于1990年5月20~22日在河南省平顶山锦纶帘子布厂召开。会议由纺织部化纤司主持。这次评比的品种是锦纶6和锦纶66的1400dtex/2浸胶帘子布和锦纶6的1400dtex/1浸胶帘子布。这次评优方法是以用户对化纤企业提供的浸胶帘子布(包括从日本、美国进口 相似文献
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目前,斜交轮胎用骨架材料主要以锦纶66和锦纶6浸胶帘子布为主,各轮胎生产厂家对这两种帘子布都有使用,本文针对这两种帘子布的性能特点,对它们的实用性及经济性进行简要分析。一、两种帘布的性能特点1.基本性能对比锦纶66与锦纶6同属脂肪族聚酰胺。锦纶6是由己内酰胺自聚而成,分子结构式为:NH(CH2)5COn;锦纶66则是由己二胺和己二酸缩聚而成,分子结构式为:NH(CH2)6NHCO(CH2)4COn。锦纶66分子中的酰胺基团形成氢键,有较强的次价力,拉伸后结晶度高,其软化点(235℃)、熔点(265℃)、抗张强度(70kN/cm)和模量(500kN/cm)都比锦纶6高,而伸长… 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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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献