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Method for testing polymerization degree of cotton linters

A technology of cotton linters and polymerization degree is applied in the field of testing the degree of polymerization of cotton linters. To achieve the effect of improving product stability and improving product quality

Pending Publication Date: 2022-02-22
玛纳斯祥云化纤有限公司
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Problems solved by technology

The national standard for cotton linters does not clearly specify the test method for the degree of polymerization of cotton linters, and cannot provide reference data for the classification, inspection, and production of cotton linters

Method used

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Examples

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Embodiment Construction

[0027] A kind of assay method of degree of polymerization of cotton linters, has following steps,

[0028] (1) Sampling, evenly sample 4-5g, pick out the impurity points in the sample, and weigh 0.0350g ± 0.0002g of the cotton linter sample after picking out;

[0029] (2) put the sample taken by weighing into a 60ml brown bottle filled with 30g copper wire, add cuproammonia solution 50ml, after dissolving the sample with cuproammonia solution;

[0030] (3) use the Ubbelohde viscometer to measure the time t1 and t0 between the two reticle lines of the Ubbelohde viscometer for the cellulose cuproammonia solution and the blank cuproammonia solution respectively;

[0031] (4) Calculate the specific viscosity, the concentration of cellulose cuproammonia solution requires 0.7g / L;

[0032] Calculation formula for increasing specific viscosity: nsp=(t1÷t0)-1

[0033] In the formula:

[0034] nsp——Increased specific viscosity of cellulose cuproammonia solution, in millipascal second...

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Abstract

The invention belongs to a method for testing cotton linters, and particularly relates to a method for testing the polymerization degree of the cotton linters. The method comprises the following steps: (1) sampling: uniformly sampling 4-5g of cotton linters, picking out impurity points in the sample, and weighing 0.0350 g + / -0.0002 g of the cotton linter sample from which the impurities are picked out; (2) putting the weighed sample into a 60ml brown bottle containing 30g of a copper wire, then adding 50ml of a copper ammonia solution, and completely dissolving the sample by using the copper ammonia solution; (3) determining the time t1 and t0 when the cellulose copper ammonia solution and the blank copper ammonia solution respectively flow through two scribed lines of the Ubbelohde viscometer by using the Ubbelohde viscometer; and (4) calculating the increased specific viscosity according to an increased specific viscosity calculation formula: nsp = (t1 / t0)-1: (5), and calculating the polymerization degree according to a polymerization degree calculation formula: DP = nsp / {(1 + 0.29 nsp) * K * c}. The method can provide data reference for classification, inspection and use production of the cotton linters, and can improve the product quality and the product stability.

Description

technical field [0001] The invention belongs to an assay method for cotton linters, in particular to an assay method for the degree of polymerization of cotton linters. Background technique [0002] Cotton linters are important raw materials for light and chemical industries such as national defense, textiles, chemical fibers, and papermaking, and are important strategic materials. my country is rich in cotton, and the cotton linter resources are very rich. The national standard for cotton linters does not clearly stipulate the test method for the degree of polymerization of cotton linters, and cannot provide reference data for the classification, inspection, and production of cotton linters. Contents of the invention [0003] The purpose of the present invention is to provide an assay method for the degree of polymerization of cotton linters, which can provide data reference for the classification, inspection, and production of short linters, and can improve product qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/06
CPCG01N11/06
Inventor 马永卓陈洪超郑永健谢文琦
Owner 玛纳斯祥云化纤有限公司
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