共查询到20条相似文献,搜索用时 367 毫秒
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为解决主机厂涂装车间工程黄色汽车内板水性漆膜针孔问题,首先通过调整工艺参数来模拟真实针孔弊病,再运用单因素变量的方法,分析讨论工程黄色面漆配方中溶剂种类及用量、消泡剂、润湿分散剂以及不同树脂组合搭配等不同因素对针孔的影响。结果表明:沸点低的溶剂含量越多,越易加速面漆漆膜的表干,从而加重出现针孔的程度;添加不同种类消泡剂对针孔问题无明显改善;优良的润湿分散剂可有效改善针孔问题;调整改善色浆研磨树脂的种类搭配可消除针孔。研磨树脂的选择是影响此次工程黄色汽车内板水性漆膜针孔的关键因素,选择与配方体系相容性佳的树脂对色漆产品良好的施工性至关重要。 相似文献
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在环氧煤沥青的底漆和面漆中分别加入自行合成的胺类缓蚀剂 R,Y和 Z后 ,采用交流阻抗和盐雾实验等方法测试。结果表明 :涂层的耐蚀性能大为提高 ,涂层针孔电阻 Rfp的阻值提高 2~ 3个数量级 ,并且涂层的物理机械性能不受影响 相似文献
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在环氧煤沥青的底漆和面漆中分别加入自行合成的胺类缓蚀剂R,Y和Z后,采用交流阻抗和盐雾实验等方法测试。结果表明,涂层的耐蚀性能大为提高,涂层针孔电阻Rtp的阻值提高2 ̄3个数量级,并且涂层的物理机械性能不受影响。 相似文献
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Batikan Koroglu Alan K. Burnham Imren Mashiana Ana Racoveanu Christopher Arose Jonathan C. Crowhurst John G. Reynolds 《Propellants, Explosives, Pyrotechnics》2024,49(2):e202300124
This experimental study investigated the effects of confinement, starting mass, and heating rate on TATB thermal decomposition and sublimation using a combined Thermo-Gravimetric Analyzer and Differential Scanning Calorimetry (TGA/DSC) instrument. The confinement of volatile products was varied using different pinhole sizes with TGA/DSC pans. The measurements showed the open pan experiments without lids/pinholes resulted in complete sublimation of TATB between 320 °C and 360 °C. The heat of sublimation was determined to be 176 kJ/mol (42 kcal /mol), consistent with literature data obtained from other experimental techniques. The use of pinholes suppressed the sublimation of TATB such that the decrease in pinhole size resulted in 1) an increase in the enthalpy of reaction and an increase in the amount of carbonaceous material remaining at the end of decomposition, and 2) convergence of the two peak temperatures corresponding to maximum heat flow and maximum weight loss. Also, a transition from a two-exotherm thermal decomposition behavior towards a single-exotherm occurred as the pinhole size was decreased for a given starting mass or as the starting mass was increased for a given pinhole size. These results indicate the kinetics of TATB sublimation, TATB thermal decomposition, and gas diffusion out of a TGA/DSC pan can all compete and result in significantly different enthalpies, amounts of remaining materials, and peak temperatures depending on the pinhole size and starting mass used in the measurements. The results also indicate precise control of process variables (pinhole size, starting mass, and heating rate) in TGA/DSC measurements is required for thermal safety assessment of explosives. 相似文献
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通过一次电泳质量事故的调查处理,深入分析了影响事故发生的原因,最终确定了杂质离子含量高是造成漆膜针孔事故的主要原因,主要阐述了电泳漆膜出现针孔弊病的影响因素及解决的办法。 相似文献
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可编程控制器应用于大量的生产过程中,但在避孕套针孔检查中的应用在全国乳胶行业来说还是首次,将可编程控制器引用到避孕套电检查中的针孔检测部分后,使我厂的电检查设备达到同行业中较为先进的水平。 相似文献
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The performance of a polymer concrete coated cement concrete under sulfuric acid environment was studied for 3 years. Both dry and wet concrete specimens were used in this study. The mass transfer coefficient ratio of cement concrete to polymer concrete was over 12. Coated cement concrete cylinders with pinholes were used to study the chemical resistance of the coated concrete under sulfuric acid environments to represent the worst sewer condition. Effects of pinhole sizes on the performance of coated concrete were studied, and changes in weight of the coated concrete specimens were measured regularly. The weight change in coated cement concrete was modeled using a film model and the effect of the pinhole sizes on the performance of the coated concrete was quantified. 相似文献
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