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High-efficiency environment-friendly cationic fibrillating cellulose preparation method

A cationic and cellulose technology, which is applied in fiber treatment, plant fiber, textiles and papermaking, etc., can solve the problems of long time consumption, drop, and high dosage of quaternary ammonium salt reagents, and achieve good transparency, mild environment, and high DPv Effect

Active Publication Date: 2019-03-19
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing Q-NFC reports, the pretreatment process requires a long period of quaternization of pulp fibers with low solid content under strong alkali and heating conditions (~65°C). The dosage is high, and sometimes it is necessary to add toxic organic solvents such as isopropanol, dimethylacetamide (DMAC), dimethyl sulfoxide (DMSO) (P Olszewska et al. Cellulose 2011 18, 1213; Yang Huanlei & Li Qun Paper and Paper Making, 2013, 32, 25; Chaker et al. Carbohydrate Polymers 2015, 131, 224; T. Ho et al. Cellulose 2011, 18, 1391; Pei et al. Soft Matter 2013, 9, 2047; Littunen et al. European Polymer Journal 2016, 75, 116; Saini et al, Carbohydrate Polymers 2016, 135, 239)
Therefore, the existing method for preparing cationic NFC (i.e. Q-NFC) has problems such as strict reaction medium environment, long time consumption, and the degree of polymerization (DPv) of the prepared Q-NFC product is seriously lower than that of pulp raw materials, so it is not conducive to actual industrial production

Method used

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  • High-efficiency environment-friendly cationic fibrillating cellulose preparation method
  • High-efficiency environment-friendly cationic fibrillating cellulose preparation method
  • High-efficiency environment-friendly cationic fibrillating cellulose preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The process of preparing Q-NFC under weak alkaline conditions is as follows:

[0024] Weigh 10.8g of urea and dissolve it in 10g of wet pulp. After all of it is dissolved, add 5.8g of 2,3-epoxypropyltrimethylammonium chloride, and heat the mixture in an oven at 50°C to constant weight. Then fully disperse the dry slurry with deionized water, and then filter and wash until the filtrate is washed with AgNO 3 The solution is tested until there is no chloride ion present. Finally, by mechanically treating the washed slurry, a transparent NFC dispersion with a positive charge on the surface is obtained.

Embodiment 2

[0026] The process of preparing Q-NFC under weak alkaline conditions is as follows:

[0027] Weigh 0.6g of urea and dissolve it in 10g of wet bamboo pulp. After all of it is dissolved, add 0.36g of 2,3-epoxypropyltrimethylammonium chloride, and heat the mixture in an oven at 65°C to constant weight. Then fully disperse the dry slurry with deionized water, and then filter and wash until the filtrate is washed with AgNO 3 The solution is tested until there is no chloride ion present. Finally, by mechanically treating the washed slurry, a transparent NFC dispersion with a positive charge on the surface is obtained.

Embodiment 3

[0029] The process of preparing Q-NFC under weak alkaline conditions is as follows:

[0030] Weigh 10.8g of urea and dissolve it in 9g of water, add 1g of dry bamboo pulp into the urea aqueous solution, after all dissolve, add 5.8g of 2,3-epoxypropyltrimethylammonium chloride, put the mixture in 65℃ The oven was heated to constant weight. Then fully disperse the dry slurry with deionized water, and then filter and wash until the filtrate is washed with AgNO 3 The solution is tested until there is no chloride ion present. Finally, by mechanically treating the washed slurry, a transparent NFC dispersion with a positive charge on the surface is obtained.

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Abstract

The invention discloses a high-efficiency environment-friendly cationic fibrillating cellulose preparation method. The method includes: in a chemical pretreatment step, using a warm and environment-friendly weakly-alkaline reagent to replace corrosive strong alkali to serve as an activating agent of natural cellulose fiber; performing quaternary ammonium salt pretreatment on paper pulp at medium temperature, performing mechanical separation to prepare Q-NFC water dispersion liquid high in polymerization and fibrillating degree and controllable in surface charge content. The preparation methodis simple, efficient, mild in reaction condition, environment-friendly and suitable for large-scale production, and Q-NFC prepared by the method can be used in the field of paper and plastic reinforcement, food packing, paint, cosmetics, electronic materials, biomedicine and environment purifying.

Description

technical field [0001] The invention relates to a method for preparing cellulose, in particular to a method for preparing cationic nanofibrillated cellulose with high efficiency and environmental protection. Background technique [0002] With the continuous development of our country's economy, the problem of resource shortage is becoming more and more serious. Cellulose is a macromolecular polysaccharide composed of glucose units, mainly found in plant cell walls, and is a natural polymer material with the largest storage capacity and the widest distribution in the world. In order to improve the utilization rate of cellulose and expand its scope of use, the fibers are usually further processed by physical or chemical methods to obtain a large class of new cellulose with a diameter of less than 100 nm and a length of several hundred or several microns. material, namely nanocellulose. According to the different morphology and preparation methods of plant-derived nanocellulo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M13/432D06M13/463D06M101/06
CPCD06M13/432D06M13/463D06M2101/06
Inventor 刘宏治单鹏嘉赵莹
Owner ZHEJIANG FORESTRY UNIVERSITY
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