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Измерение завершения вращения методом ЯМР в слабом поле
Масло, нанесенное на волокна, служит нескольким важным целям., в первую очередь действует как смазка и антистатик. Кроме того, он играет решающую роль в качестве носителя для различных химических агентов., в том числе волокнистые бактерициды, антипирены, и красители. The завершение вращения of fibers stands out as a pivotal quality control parameter that directly determines the fiber’s suitability for its intended purpose. Однако, achieving uniform завершение вращения distribution remains a frequent challenge in the chemical fiber production process.
Fibers with insufficient завершение вращения are susceptible to static electricity, while those with excessive завершение вращения are prone to tangling, both of which can significantly disrupt the textile manufacturing process. Следовательно, precise measurement of завершение вращения becomes paramount for an accurate assessment and effective control of this crucial parameter.
Финиш вращения Методы измерения
Test methods for assessing the завершение вращения of wool fibers encompass various techniques. The current standard, ГБ/Т 6504-2008, outlines several established methods, including the standard extraction method, способ мытья нейтральным мылом, метод оптического показателя преломления, and nuclear magnetic resonance method.
To streamline production processes, Sinopec has introduced several innovative test methods. These include the ‘rapid extraction method,’ атомно-абсорбционный метод, метод проводимости, метод колебаний дистиллированной воды, и ультрафиолетовая спектроскопия. These alternative methods are tailored to specific product types, offering flexibility in завершение вращения evaluation.
Principle of the Wool Fiber Финиш вращения Measurement Method
Optical Refractive Index Method: This method employs total internal reflection to measure the refractive index of an unknown substance. It involves quantitatively analyzing certain components in the solution to assess substance purity, which aids in determining the завершение вращения образца.
Neutral Soap Washing Method: The neutral soap washing method capitalizes on the affinity between soap and oil. By applying washing force, масло на образце переходит в мыло. The завершение вращения of the sample is then determined by assessing the mass change of the sample before and after washing.
Standard Extraction Method: This method operates on the principle of dissolving oil that can be dissolved in a specific organic solvent. It involves extracting the oil from the sample using an appropriate organic solvent in a fat extractor. Впоследствии, the solvent is evaporated to dryness, and the remaining oil’s weight is measured. By comparing the weight of the residual oil to the initial sample weight, тот завершение вращения of the sample is calculated.
Low-Field NMR Method: The Low-Field NMR (Ядерный магнитный резонанс) method utilizes NMR spectroscopy to transmit a pulsed magnetic field to the fiber sample. When the magnetic field is canceled, the response magnetic signal of the sample is detected. Because the signal emitted by the fiber decays more rapidly than that of the oil, тот завершение вращения of the sample can be derived from the difference between the two signals.
The Advantages of Low-Field NMR Method
Accuracy: This method offers precise measurements. It can distinguish between the завершение вращения and the fiber itself, providing accurate data on the завершение вращения content without being influenced by other factors.
Скорость: Low-field NMR provides rapid results. Unlike traditional extraction methods that may involve time-consuming processes such as solvent extraction and evaporation, NMR measurements are typically quicker, reducing overall detection time.
Неразрушающий: Low-field NMR is a non-destructive technique. Unlike some traditional methods that consume the sample or alter its properties during testing, NMR allows for the preservation of the original sample, which can be beneficial for further analysis or quality control.
No Harmful Reagents: Traditional methods often require the use of potentially harmful reagents or chemicals. В отличие, NMR is based on magnetic resonance, making it a safer and more environmentally friendly option.
Minimized Experience Errors: Traditional methods can be subject to errors due to variations in operator experience and technique. Low-field NMR provides consistent and objective measurements, minimizing the impact of operator-related errors.
Reduced Labor Costs: The streamlined and automated nature of NMR testing can reduce labor costs associated with sample preparation and handling, as well as the need for extensive manual intervention.
Low-Field NMR Instrument for Финиш вращения Измерение
