Тест Spin Finish шерстяных волокон методом ЯМР в низком поле NIUMAG
The importance of measuring Spin Finish of wool fibers
Масло на волокне обычно используется в качестве смазки или антистатика., он также используется в качестве носителя для химических агентов, таких как волокнистые бактерициды., антипирены, и красители. Степень отжима также является важным параметром контроля качества., которые непосредственно решают, может ли волокно соответствовать требованиям его использования.. Однако, the uneven spin finish is a high incidence problem in the chemical fiber production process. Fibers with low spin finish are prone to static electricity, while fibers with high spin finish are prone to entanglement, both of which will seriously affect the normal process of textile processing. Поэтому, it is very important to accurately measure the spin finish of fibers to accurately grasp and control the spin finish.
Test Methods for the spin finish of Wool Fibers
The test methods specified in the current standard GB/T 6504-2008 “Test Method for spin finish of Chemical Fibers” include extraction method (hereinafter referred to as standard extraction method), способ мытья нейтральным мылом, optical refractive index method and nuclear magnetic resonance method. Кроме того, in order to facilitate production, Sinopec has developed several new test methods, включая “rapid extraction method”, атомно-абсорбционный метод, метод проводимости, метод колебаний дистиллированной воды, ultraviolet spectroscopy, и т. д.. The methods are used for certain types of products. test method.
Principle of the Wool Fiber spin finish Test Method
Стандартный метод экстракции: The principle of the standard extraction method is to use the oil that can be dissolved in a specific organic solvent, extract the oil in the sample with the appropriate organic solvent through the fat extractor, and then evaporate the solvent to dryness and weigh. The quality of the residual oil and the quality of the sample are calculated to obtain the spin finish of the sample.
Способ стирки нейтральным мылом: The principle of neutral soap washing method is to use the affinity between soap and oil, and under the action of washing force, масло на образце переходит в мыло, and then Calculate the spin finish of the sample according to the mass change of the sample before and after washing.
Метод оптического показателя преломления: The principle of optical refractive index method is to use the method of measuring the critical angle of total reflection to measure the refractive index of an unknown substance, and to quantitatively analyze some components in the solution to test the purity of the substance”.
Low-field NMR method: The principle of NMR method is to use 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 is higher than that of the oil. The decay is fast, and the spin finish of the sample can be converted from the difference between the two.
Advantages of Low-field NMR to Determine the spin finish of Wool Fibers
Most of the traditional fiber spin finish detection methods use extraction methods; there are limitations such as long detection time, delayed detection results, the need to use harmful reagents, high labor costs, and experience errors. In view of the shortcomings of traditional methods, Niumag developed a method to test the spin finish of fibers using low-field NMR.
Performance Characteristics: Быстрый, Precise, Неразрушающий.
NIUMAG Fiber spin finish NMR Analyzer
Only 30 секунды, fast response, meet the needs of large sample testing, and provide the possibility for online real-time quality control
National standard method – NMR method to ensure accurate measurement, неразрушающий, environmental protection, longitudinal experiments can be carried out.