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Cationic cellulose with high substitution degree and preparation method and application thereof

A cationic cellulose, high degree of substitution technology, applied in the field of functionalization reaction of natural polysaccharide polymers, can solve the problems of long dissolution and reaction time, complex intermediate treatment process, high technical cost, and eliminate intermediate pressing or washing and alkali removal. steps, reducing material consumption and energy consumption, and simplifying the effect of the synthesis process

Inactive Publication Date: 2013-08-07
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Generally speaking, the above methods have problems such as poor cellulose dissolution, long dissolution and reaction time, complicated intermediate treatment process, high equipment matching requirements, high technical cost, and low efficiency to varying degrees, and are not feasible for large-scale application. sex

Method used

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  • Cationic cellulose with high substitution degree and preparation method and application thereof
  • Cationic cellulose with high substitution degree and preparation method and application thereof
  • Cationic cellulose with high substitution degree and preparation method and application thereof

Examples

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Effect test

Embodiment 1～11

[0037] Using natural cotton linters as raw materials to prepare cationic cellulose with a high degree of substitution, the specific operation steps are as follows, and the differences between the examples are shown in Table 1:

[0038] (1) Activation: Mix cellulose with isopropanol I under normal temperature and pressure, stir to make the cellulose dispersed evenly, then add 30% sodium hydroxide aqueous solution and auxiliary activator sodium borate (Na 2 B 4 O 7 ·10H 2 O), perform activation reaction according to the pretreatment conditions in column 7 of Table 1 to obtain liquid A;

[0039] (2) Cationization reaction: Add isopropanol II and cationic etherification agent (3-chloro-2-hydroxypropyltrimethylammonium chloride, CTA, 50% mass fraction aqueous solution) into liquid A, according to The cationization reaction was carried out under the reaction conditions in the 7th column of Table 1 to obtain Liquid B;

[0040] (3) Post-treatment: Cool liquid B to room temperature, filter, w...

Embodiment 1

[0047] The basic operation process of Examples 12-17 is the same as that of Example 1. The changes made are only adjustments to the type of etherifying agent and activator used in Example 1, the amount of each substance added, and the reaction conditions. Among them, Example 12 and The cationic etherifying agent in 15 is glycidyl dodecyl dimethyl ammonium chloride, and the cationic etherifying agent in Examples 13 and 17 is glycidyl tetradecyl dimethyl ammonium chloride, The cationic etherifying agent in Examples 14 and 16 is glycidyl benzyl dimethyl ammonium chloride, as shown in Table 2.

[0048] Table 2 The proportions of reactants and test results of each embodiment

[0049]

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Abstract

The invention discloses cationic cellulose with a high substitution degree and a preparation method and application thereof, and particularly discloses a reaction method for preparing cationic cellulose by adopting a technical process comprising cellulose activation, cationization reaction, purification (including filtration and elution) and drying for obtaining a product under the condition of normal temperature and normal pressure in a heterogeneous system. The method comprises the following steps of: firstly, uniformly mixing cellulose with isopropanol under the condition of stirring, adding a sodium hydroxide solution and an activating agent in sequence and activating at a temperature 10-30 DEG C for 40-80 minutes; secondly, adding isopropanol and a cationic etherifying agent once again and reacting at a temperature 20-80 DEG C for 2-4 hours; and lastly, cooling a reaction system, performing post-treatment processes such as filtering, washing and the like for impurity removal, anddrying to obtain a cationic cellulose product with high purity and a high substitution degree. According to the preparation method disclosed by the invention, the cationic cellulose of which the substitution degree is 0.35-0.54 is obtained.

Description

Technical field [0001] The invention belongs to the technical field of the functional reaction of natural polysaccharide polymers, and particularly relates to a cationic cellulose with a high degree of substitution and a preparation method and application thereof. Background technique [0002] Cellulose derivatives are the products of the esterification or etherification reaction between the hydroxyl groups in the cellulose polymer and chemical reagents. They have excellent water solubility, surface activity, stable colloids, ecological and biological compatibility, etc. It can play the role of dispersion, emulsification, thickening, bonding, film formation and water retention, and its application range covers many technical fields from general civilian, industrial and new materials, and it is in the process of continuous expansion. It is a very important fine Functional polymer materials. [0003] The cationization reaction of cellulose is one of the important technical contents ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/14
Inventor 陈玉放李伟
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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