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Cationic cellulose with high degree of substitution and its preparation method and application

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: 2011-12-07
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • 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 degree of substitution and its preparation method and application
  • Cationic cellulose with high degree of substitution and its preparation method and application
  • Cationic cellulose with high degree of substitution and its preparation method and application

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Embodiment 1～11

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

[0038] (1) Activation: under normal temperature and pressure, cellulose is mixed with isopropanol I, and after stirring to make the cellulose dispersed evenly, then adding a mass fraction of 30% sodium hydroxide aqueous solution and auxiliary activator sodium borate (Na 2 B 4 o 7 10H 2 O), according to the pretreatment condition of the 7th column in table 1, carry out activation reaction, obtain liquid A;

[0039] (2) Cationic reaction: add isopropanol II and cationic etherifying agent (3-chloro-2-hydroxypropyltrimethylammonium chloride, CTA, mass fraction is 50% aqueous solution) in liquid A, according to The reaction conditions in column 7 of Table 1 were used for cationic reaction to obtain liquid B;

[0040] (3) Post-treatment: Cool liquid B to room tem...

Embodiment 1

[0047]The basic operation process of embodiment 12~17 is the same as embodiment 1, and the change that is done is just to adjust the kind of the etherifying agent used in embodiment 1 and activator, each material addition and reaction condition, wherein embodiment 12 and The cationic etherifying agent in 15 is glycidyl dodecyl dimethyl ammonium chloride, and the cationic etherifying agent in embodiment 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] Reaction substance proportioning and test result of each embodiment of table 2

[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 functional reaction of natural polysaccharide polymers, in particular to cationic cellulose with a high degree of substitution and its preparation method and application. Background technique [0002] Cellulose derivatives are the products of the esterification or etherification reaction between the hydroxyl group in the cellulose polymer and chemical reagents, which have excellent water solubility, surface activity, stable colloid, ecology and biocompatibility, etc. It can play the role of dispersion, emulsification, thickening, adhesion, film formation and water retention. Its application range covers many technical fields from general civil, 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 to cellulose is one of the important technical contents to realize the functional applicat...

Claims

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Application Information

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Patent Type & Authority Applications(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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