GB/T 27842-2011
ActiveChemicals--Test method for dynamic surface tension--Fast-bubble technique
化学品 动态表面张力的测定 快速气泡法
Catalogue
前言 → 1 范围 → 2 规范性引用文件 → 3 术语、定义和符号 → 4 方法原理 → 5 意义和用途 → 6 仪器和设备 → 7 试剂和材料 → 8 校准和规范化 → 9 试验步骤 → 10 计算 → 11 报告 → 附录A 警告声明 Foreword → 1 Scope → 2 Normative References → 3 Terms, Definitions and Symbols → 4 Principle of Method → 5 Significance and Use → 6 Apparatus and Equipment → 7 Reagents and Materials → 8 Calibration and Standardization → 9 Procedure → 10 Calculation → 11 Report → Annex A Warning Statements
Scope
This standard specifies the principle, significance and use, apparatus and equipment, reagents and materials, calibration and standardization, procedure, calculation and report for the determination of dynamic surface tension of chemicals by the fast-bubble technique. This standard is applicable to the determination of free energy of instantaneously formed liquid-gas interfaces. This standard is applicable to liquids with a vapor pressure less than or equal to 30.0 kPa and a kinematic viscosity less than or equal to 4.0 mm/s at the test temperature. Note: Liquids of higher viscosity have not been studied.
本标准规定了化学品快速气泡法测定动态表面张力的原理、意义和用途、仪器和设备、试剂和材料、校准和规范化、实验步骤、计算和报告。本标准适用于表面形成瞬时液一气界面自由能的测定。本标准适用于试验温度下，蒸汽压小于或等于30.0 kPa并且运动黏度小于或等于4.0 mm/s的液体。注：更高黏度的液体尚未进行研究。
Normative References
Keywords
Application Summary AI generated
Technicians in the chemical industry, research institutions, and quality inspection departments use this standard to measure the dynamic surface tension of chemicals using the fast-bubble technique. This standard is used to evaluate the surface activity of liquids when interfaces are formed rapidly, which is critical for designing liquid processing equipment such as distillation columns and for studying surfactant performance. It provides a unified test method, ensuring comparability and reliability of data across different laboratories.
化学工业、科研机构及质检部门的技术人员使用该标准，通过快速气泡法测定化学品的动态表面张力。该标准用于评估液体在快速形成界面时的表面活性，对设计混合液处理设备（如蒸馏塔）以及研究表面活性剂性能至关重要。它提供了统一的测试方法，确保不同实验室间数据的可比性和可靠性。
AI Summary AI generated
This standard GB/T 27842-2011 specifies a method for determining the dynamic surface tension of chemicals using the fast-bubble technique, applicable to liquids with vapor pressure ≤ 30.0 kPa and kinematic viscosity ≤ 4.0 mm/s. The method is based on measuring the pressure difference at the capillary tip for bubble formation at various bubble frequencies, and calculating surface tension using a calibration constant. The standard details apparatus, reagents, calibration, procedure, and calculation, and includes warning statements. It is equivalent to ASTM D3825, providing a unified specification for dynamic surface tension testing of chemicals.
本标准GB/T 27842-2011规定了用快速气泡法测定化学品动态表面张力的方法，适用于蒸汽压≤30.0 kPa、运动黏度≤4.0 mm/s的液体。方法基于测量不同气泡频率下毛细管尖端形成气泡的压力差，通过校准常数计算表面张力。标准详细描述了仪器设备、试剂、校准步骤、试验流程及计算，并提供了警告声明。该标准等效采用ASTM D3825，为化学品的动态表面张力测试提供了统一规范。
Key Sentences extracted from text
本标准规定了化学品快速气泡法测定动态表面张力的原理、意义和用途、仪器和设备、试剂和材料、校准和规范化、实验步骤、计算和报告。
本标准适用于表面形成瞬时液一气界面自由能的测定。
浸入液体的毛细管尖端形成气泡所需的压力通过气体流速来测定，该气体流速提供了一系列气泡频率。
利用式(5)计算每一流速的表面张力：y—A△P(1+675mI／△P)。
绘制出7和对应t的关系曲线，并内插加入t--25 ms或其他特定表面失效时的7值。
This standard specifies the principle, significance and use, apparatus and equipment, reagents and materials, calibration and standardization, procedure, calculation and report for the determination of dynamic surface tension of chemicals by the fast-bubble technique.
This standard is applicable to the determination of free energy of instantaneously formed liquid-gas interfaces.
The pressure required to form bubbles at the tip of a capillary immersed in the liquid is measured by the gas flow rate, which provides a series of bubble frequencies.
Calculate the surface tension for each flow rate using equation (5): y = A△P(1 + 675rD/△P).
Plot the curve of y versus corresponding t, and interpolate the y value at t = 25 ms or other specified surface age.