A detection method and application of cellulose acetate tow

A technology of cellulose acetate tow and cellulose acetate, applied in the field of detection, can solve the problems of easy blockage, inability to obtain, limited data, etc., and achieve the effect of avoiding blockage and improving production capacity

Active Publication Date: 2016-05-04
CHINA TOBACCO GUANGDONG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acetate tow is also often characterized by the above methods, but electron microscope observation can only observe very local trace information, and cannot obtain the real structural information of the overall state of the polymer in solution; while the viscosity method can only obtain polymer The viscosity-average molecular weight of the obtained polymer is limited, and due to the limited information, it has little guiding significance for production
Existing cellulose acetate tow production is prone to clogging as the concentration of cellulose acetate increases
The contriver thinks, the reason that clogging takes place one may be due to containing impurity, the 2nd, may be because the concentration of cellulose acetate is different, and its structural distribution in solution is different, when concentration is too high, the micelle of cellulose acetate and micelle aggregate distribute too much. For a long time, it may lead to the occurrence of blockage
However, in industrial production, the cause of clogging is currently mainly attributed to impurities, and there is no detection of the structural state of cellulose acetate. Therefore, even if the impurities in cellulose acetate are removed by multi-stage filtration, clogging cannot be avoided during the production process. happened
[0003] The above-mentioned existing characterization method of cellulose acetate tow, even if the characterization results meet the requirements, due to the limited data obtained, it is impossible to judge the structural distribution of cellulose acetate tow in the solution, so it cannot provide a complete and practical solution for the subsequent spinning process. Guidance information on application values

Method used

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  • A detection method and application of cellulose acetate tow
  • A detection method and application of cellulose acetate tow
  • A detection method and application of cellulose acetate tow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] S1. Dissolve the cellulose acetate tow in acetone, ultracentrifuge to remove the titanium dioxide added in the synthesis process of the cellulose acetate tow, take the upper layer of filtrate, and filter it with a membrane to remove dust and other impurities in the solution;

[0040] S2. The filtrate obtained after filtering the S1 membrane is detected by light scattering method to obtain the hydrodynamic radius R h , Mean square radius of rotation R g Structure factor R g / R h ;

[0041] figure 2 Is the hydrodynamic radius distribution diagram of acetate tow at different concentrations f ( R h ), it can be seen that as the concentration of the acetate tow solution increases, the micelle aggregates further increase.

[0042] S3. Through the hydrodynamic radius R h The size and hydrodynamic radius distribution map f ( R h ), it can be judged that the tows are single-stranded, micelles or micellar aggregates in the acetone solution.

[0043] image 3 Is the hydrodynamic radius o...

Embodiment 2

[0048] S1. Dissolve the cellulose acetate tow in acetone, ultracentrifuge, take the filtrate, filter it with a membrane, and detect its clogging value; make the clogging value 15 g / cm²;

[0049] S2. The filtrate obtained after filtering the S1 membrane is detected by light scattering method to obtain the hydrodynamic radius, the mean square rotation radius, and the structure factor;

[0050] S3. Through the size of the hydrodynamic radius distribution and the hydrodynamic radius distribution diagram; determine the distribution state of the tow in the acetone solution: that is, the size of single strands, micelles or micellar aggregates; after testing, the acetate filament The hydrodynamic radius of the beam in solution R h Is 100 to 200 microns.

[0051] According to the judgment result, it is considered that the clogging value of the acetate fiber tow is too low, which is prone to clogging, and its concentration needs to be reduced.

[0052] S4. Reduce the concentration of cellulose ...

Embodiment 3

[0056] S1. Dissolve the cellulose acetate tow in acetone, ultracentrifuge, take the filtrate, filter it with a membrane, and detect its clogging value; make the clogging value 15 g / cm²;

[0057] S2. The filtrate obtained after filtering the S1 membrane is detected by light scattering method to obtain the hydrodynamic radius, the mean square rotation radius, and the structure factor;

[0058] S3. Through the size of the hydrodynamic radius distribution and the hydrodynamic radius distribution diagram; determine the distribution state of the tow in the acetone solution: that is, the size of single strands, micelles or micellar aggregates; after testing, the acetate filament The hydrodynamic radius of the beam in solution R h Is 100 to 200 microns.

[0059] According to the judgment result, it is considered that the clogging value of the acetate fiber tow is too low, which is prone to clogging, and its concentration needs to be reduced.

[0060] S4. Reduce the concentration of cellulose ...

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Abstract

The invention discloses a method for detecting an acetate cellosilk bundle. The detection method is used for detecting a structure of the acetate cellosilk bundle by a light scattering method. The method comprises the following steps of S1, dissolving the acetate cellosilk bundle into acetone, performing ultracentrifugation, taking filtrate, and performing membrane filtration; S2, detecting the filtrate obtained by membrane filtration in the S1 by the light scattering method to obtain a fluid mechanics radius Rh, a mean square rotation radius Rg and a structural factor Rg / Rh; and S3, determining the existence state of the cellosilk bundle in an acetone solution to be a single chain, micelle or a micelle cluster according to the fluid mechanics radius Rh and a fluid mechanics radius distribution graph. The detection method can acquire detailed structural information of a polymer in the solution and has a great significance in synthesis and spinning of the tobacco acetate cellosilk bundle. According to the detection method disclosed by the invention, spinning processing of the acetate cellosilk bundle is instructed, and blocking in a processing process can be avoided.

Description

Technical field [0001] The present invention relates to the detection field, and more specifically, to a detection method of acetate fiber tow and its application. Background technique [0002] At present, the characterization methods of polymer structure information mainly include electron microscope, viscosity method and other methods. The electron microscope can directly observe the structure information such as the size and morphology of the polymer, and the viscosity method can measure the viscosity average molecular weight of the polymer. Acetate tows are also often characterized by the above methods, but the electron microscope method can only observe very local trace information, and cannot obtain the real structure information of the overall state of the polymer in the solution; while the viscosity method can only obtain the polymer The viscosity average molecular weight of the polymer is limited, and the information is limited, so it is of little significance to the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/49
Inventor 谢定海李旭华方细玲
Owner CHINA TOBACCO GUANGDONG IND
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