Preparation method of density gradient column

A density gradient and density technology, applied in the direction of material analysis by observing sunken objects, can solve the problems of beginners unable to prepare density gradient columns, incomplete drugs, etc., and achieve the effect of detailed operation steps and high success rate.

Pending Publication Date: 2022-07-12
山西钢科碳材料有限公司
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Problems solved by technology

[0004] However, the inventors of the present invention found that the content given by the GB / T30019 standard is too broad, and the drugs recommended for use are not comprehensive. Using the method described in this standard to configure the target range of the density gradient column depends entirely on experience. It is impossible to accurately prepare a density gradient column in the target range at one time according to the method provided by this standard

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  • Preparation method of density gradient column

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preparation example Construction

[0049] This embodiment provides a method for preparing a density gradient column. According to the bulk density value of the product to be tested, the target position of the product in the density gradient tube is designed, the float and the drug used are selected, and the light used for preparing the density gradient column is reversely pushed out. The preparation method of liquid and heavy liquid is given, and the detailed preparation method of density gradient column is given, which includes the following steps:

[0050] Float preparation steps: Determine the number and density of the required floats according to the bulk density range of the product to be tested; and preprocess the selected floats.

[0051] Among them, 1) According to the volume density range of the product to be tested, the detection accuracy requirements, the target position where the float with the largest density is suspended in the density gradient column and the target position where the float with th...

Embodiment 1

[0102] In this example, a density gradient column for detecting the density of carbon fiber is prepared. The main steps are as follows:

[0103] Float preparation steps: The bulk density of the carbon fiber to be tested is about (1.795-1.805) g / cm 3 , in order to make the sample to be tested stably suspend in the density gradient column between 30-40cm, the maximum liquid level is designed to be about 70cm in the density gradient tube, and it is planned to evenly disperse 5 floats between the 10cm-60cm scale, so choose 5 floats were set, and the density values ​​were 1.7883g / cm 3 , 1.7949g / cm 3 , 1.8012g / cm 3 , 1.8144g / cm 3 , 1.8232g / cm 3 . Since the float has been in use, after salvaging it from the density gradient tube, soak the float in carbon tetrachloride.

[0104] Here, 1.8232-1.7883=0.0349, 0.0349÷5×7=0.049, which meets the accuracy requirements of bulk density detection: accuracy requirements≤±0.001g / cm 3 When the overall density difference is not more than 0....

Embodiment 2

[0149] This example prepares a density gradient column for detecting the density of the precursor. The main steps are as follows:

[0150] Float preparation steps: the bulk density of the raw silk to be measured is about (1.180-1.190) g / cm 3 , in order to make the position of the sample to be tested stably suspended in the density gradient column between 30-40cm, the maximum liquid level is designed to be about 70cm in the density gradient tube, and it is planned to evenly disperse 5 floats between the 10cm-60cm scale, so choose 5 floats were set, and the density values ​​were 1.1689g / cm 3 , 1.1721g / cm 3 , 1.1802g / cm 3 , 1.1875g / cm 3 , 1.1956g / cm 3 . Since the float has been in use, after salvaging it from the density gradient tube, soak the float in xylene.

[0151] Here, 1.1956-1.1689=0.0267, 0.0267÷5×7=0.037, which meets the accuracy requirements of bulk density detection: accuracy requirements≤±0.001g / cm 3 When the overall density difference is not more than 0.05g / ...

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Abstract

The invention relates to a preparation method of a density gradient column. The preparation method comprises the following steps: determining the number and density of required floaters according to the volume density range of a to-be-detected product; selecting a first medicine and a second medicine according to the to-be-detected product; firstly, the density value of the highest liquid level and the density value of the lowest liquid level of mixed liquid in the density gradient tube are determined; wherein the mixed liquid is formed by mixing a first liquid and a second liquid, and the density of the first liquid is lower than that of the second liquid; further determining the density preparation value of the first liquid and the density preparation value of the second liquid in the mixed liquid at the target control temperature; preparing the first medicine and the second medicine into first liquid and second liquid according to the density preparation value; and filling the prepared floater, the first liquid and the second liquid into a density gradient tube to prepare the density gradient column. According to the preparation method of the density gradient column provided by the invention, the linear density gradient column within the target density gradient range can be rapidly prepared at one time.

Description

technical field [0001] The invention relates to the technical field of bulk density detection, in particular to a preparation method of a density gradient column. Background technique [0002] In the field of carbon fiber production, its precursor precursors (ie, carbon fiber precursors), intermediate product pre-oxygen fibers, and product carbon fibers and graphite fibers are all inseparable from the index detection of bulk density. At present, the bulk density detection methods of carbon fiber mainly include the following three methods: liquid displacement method, floating-sinking method and density gradient column method. The implementation standard is GB / T30019. Among them, the main principle of using the density gradient column method to measure the density of carbon fiber body is to test according to the equilibrium position of the observed sample in the liquid column whose density increases linearly. The volume density measured by this method is more accurate than th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/14
CPCG01N9/14
Inventor 雷爱民李旭东张雪段瑞云李学刚李庚泉严华王俊艳侯梦雪
Owner 山西钢科碳材料有限公司
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