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    粘度杯涂4杯/蔡恩蓓

    Applied to the semiconductor industry:

    Testing Equipment-Others

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     涂-4 杯 黏 度 计 法  采用涂-4杯黏度计测试的黏度为条件黏度,单位为s.它适合于测试胶黏剂流出时间为10~150s的产品.如航空用自力-2胶黏剂(溶剂型)就规定其涂-4杯黏度为60~90s.

     一.原理  测定盛装在一特定锥形容器中的100ml胶黏剂,通过下部一直径为(4±0.2)mm漏孔的流出时间. 

    二.仪器设备  涂-4杯黏度计由塑料或黄铜加工而成,但以金属黏度计为准.上部为圆柱形,下部为圆锥形,壁表面粗糙度0.4um.锥性底部有一漏嘴,高(4±0.02)mm,孔内直径为(4±0.02)mm,用不锈钢制成.黏度计锥体内部的角度为81°±15’,总高度73mm,圆柱体内径50+2mm,容量为100ml.温度计,分度为0.1℃.秒表,精度为0.2s.

     三.试验步骤  1.取样  试样应为无结块,无凝胶,均匀的流体.事先将试样放在规定温度(如25℃)下恒温.  2.试验  测试前应用沾有溶剂的纱布清洁黏度计内表面,冷风干燥,对光观察漏嘴孔内应洁净.将黏度计安置在水平位置上,黏度计下面放置100ml量杯,将胶黏剂试样事先加热到25+0.5℃时,用左手中指堵住黏度计漏嘴孔,迅速将试样倒入黏度计杯,用玻璃棒将气泡和多余试样刮入槽内,是杯内液面与杯边缘齐平.若室温高于25℃,则将试样事先控制在25-0.5.放开按紧的左手中指,使胶黏剂流出,同时开动秒表,记录胶黏剂从黏度计漏嘴孔中流出其流丝中断的时间(s).

     四.结果评定  以两次测定值之差不大于平均值3%作为试验结果。测定时胶黏剂试样温度为(25±1)℃ 

    五.影响因素  1.仪器  涂-4黏度计的漏嘴应小心保护,切勿损伤.试验完成及时用合适溶剂清洗干净,清洗时切忌用硬物刮.黏度计架应安放水平.黏度计应定期进行检验,通常用(25±1)℃的蒸馏水按上述步骤测试,若流出时间不在(11.5±0.5)℃范围时,则应予以更换

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