Method for evaluating reaction performance of cellulose pulp and application thereof

A technology for the reaction performance of cellulose pulp, which is applied in the field of evaluation of the reaction performance of cellulose pulp, can solve the problems of lower product yield, poor quality and reaction performance, and influence on solvent recovery, so as to achieve both product quality and production cost , Ensure high quality and high performance, and solve the problem of raw material restrictions

Pending Publication Date: 2022-05-06
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combined with the production process of Lyocell fiber, if the quality and reaction performance of cellulose pulp raw materials are not good, on the one hand, it will cause some cellulose to dissolve first during the mixing and swelling stage, resulting in blockage of fiber pores and affecting the further diffusion of NMMO solvent, thus Colloidal particles are produced, making it difficult to form high-quality and uniform spinning dope
On the other hand, during the regenerative molding process of the fiber tow in the coagulation bath, some cellulose may also be precipitated, which not only reduces the product yield, but also affects solvent recovery

Method used

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  • Method for evaluating reaction performance of cellulose pulp and application thereof
  • Method for evaluating reaction performance of cellulose pulp and application thereof
  • Method for evaluating reaction performance of cellulose pulp and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In the present embodiment, the specific steps for evaluating the reaction performance of cellulose pulp (a certain sulfite process softwood pulp) are as follows:

[0050] Pretreatment steps: Tear the wood pulp for testing into 5mm×5mm pieces, dry it to constant weight at 105°C, and balance the moisture in the desiccator for later use; configure the mass ratio of water to NMMO as 1:4 The NMMO aqueous solution was pre-equilibrated in a constant temperature water bath at 80°C.

[0051] Step (1): Submerge 1g of the above-mentioned wood pulp fragments in 10g of the above-mentioned NMMO aqueous solution, and place them in a water bath at 80°C for 10s to obtain a mixed solution of wood pulp-NMMO aqueous solution, and put a magnetic rotor into the mixed solution , adjust the rotational speed to 1000r / min, stir at 80°C for 2min, then add 10g of NMMO aqueous solution, the mass ratio of water to NMMO in the NMMO aqueous solution is 1:4, and adjust the rotational speed to 1500r / min...

Embodiment 2

[0055] In the present embodiment, the specific steps for evaluating the reaction performance of cellulose pulp (a certain sulfite process softwood pulp) are as follows:

[0056] Pretreatment steps: Tear the wood pulp used for testing into 5mm×5mm pieces, dry it to constant weight at 105°C, and balance the moisture in the desiccator for later use; configure the mass ratio of water to NMMO as 1:3 The NMMO aqueous solution was pre-equilibrated in a constant temperature water bath at 80°C.

[0057] Step (1): Submerge 1g of the above-mentioned wood pulp fragments in 25g of the above-mentioned NMMO aqueous solution, place them in a water bath at 90°C for 30s to obtain a mixed solution of wood pulp-NMMO aqueous solution, and put a magnetic rotor into the mixed solution , adjust the rotational speed to 1000r / min, stir at 90°C for 2min, then add 25g of NMMO aqueous solution, the mass ratio of water to NMMO in the NMMO aqueous solution is 1:3, and adjust the rotational speed to 1500r / mi...

Embodiment 3

[0061] In the present embodiment, the specific steps for evaluating the reaction performance of cellulose pulp (a certain sulfite process hardwood pulp) are as follows:

[0062] Pretreatment steps: Tear the wood pulp for testing into 5mm×5mm pieces, dry it to constant weight at 105°C, and balance the moisture in the desiccator for later use; configure the mass ratio of water to NMMO as 1:4 The NMMO aqueous solution was pre-equilibrated in a constant temperature water bath at 80°C.

[0063] Step (1): Submerge 1g of the above-mentioned wood pulp fragments in 10g of the above-mentioned NMMO aqueous solution, and place them in a water bath at 80°C for 10s to obtain a mixed solution of wood pulp-NMMO aqueous solution, and put a magnetic rotor into the mixed solution , adjust the rotational speed to 1000r / min, stir at 80°C for 2min, then add 10g of NMMO aqueous solution, the mass ratio of water to NMMO in the NMMO aqueous solution is 1:4, and adjust the rotational speed to 1500r / min...

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Abstract

The invention discloses a method for evaluating the reactivity of cellulose pulp and application thereof, and the method provided by the invention comprises the following steps: calculating the percentage of soluble components of different types of cellulose pulp in the total mass of the cellulose pulp by testing the dissolution behaviors of the cellulose pulp in a low-concentration NMMO solvent and a high-concentration NMMO solvent respectively; the method can more intuitively and effectively evaluate the purity, molecular weight distribution and low-molecular-weight cellulose content of the pulp, can effectively evaluate the reaction performance of the cellulose pulp in the production process of regenerated cellulose fibers, especially Lyocell fibers, breaks the dependence of the prior art on a determination method of the pulp for viscose fibers, and has a wide application prospect. The method for evaluating the pulp for the Lyocell fiber fills the blank of the method for evaluating the pulp for the Lyocell fiber, forms a more targeted evaluation system for the pulp for the Lyocell fiber, and has positive significance for screening the pulp special for the Lyocell fiber, reducing the cost of the pulp and solving the raw material limitation problem of the Lyocell fiber industry.

Description

technical field [0001] The invention belongs to the technical field of cellulose pulp detection, and in particular relates to a method for evaluating the reaction performance of cellulose pulp and its application. Background technique [0002] Lyocell fiber is a new type of regenerated cellulose fiber produced from natural cellulose and N-methylmorpholine-N-oxide (NMMO for short) as a solvent without chemical reaction, because of its excellent Environmental protection features and outstanding product performance have attracted wide attention from the market, and it is an emerging industry with broad prospects and rapid development. However, the advanced Lyocell fiber dissolving technology and harsh NMMO solvent system put forward very high requirements on the quality of cellulose pulp raw materials and the dissolving conditions of cellulose pulp. Most of the raw material pulp used in the field of Lyocell fiber in my country is imported, and the evaluation of the reaction pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/38G01N1/34G01N1/30G01N5/04
CPCG01N1/28G01N1/38G01N5/04G01N1/30G01N1/34
Inventor 杨洋杨浚源薛振军程敏李婷程春祖徐纪刚
Owner CHINESE TEXTILE ACAD
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