Esterquat-containing modified nano-cellulose as well as preparation method and application thereof

A technology of nano-cellulose and ester-based quaternary ammonium salt, which is applied in the field of organic modification of cellulose, can solve the problems of lack of thermoplasticity, complex technology, application limitations, etc., achieve easy-degradable tensile properties, simple synthesis method, and preparation method simple effect

Active Publication Date: 2015-09-16
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the aggregated structural characteristics of natural cellulose and the presence of many hydroxyl groups and high crystallinity between molecules and molecules, it cannot be dissolved in water and general organic and inorganic solvents, and it also lacks thermoplasticity and chemical corrosion resistance. Poor performance and strength, which are extremely unfavorable to its molding, processing and application, resulting in many restrictions on its application
For example, in the application of cellulose to polylactic acid modification, there are problems such as poor compatibility between cellulose and polylactic acid and poor mechanical properties.
[0003] At present, it has been reported to use small molecule and polymer quaternary ammonium salt cations to synergistically modify nanocellulose, but the method is relatively complicated, the modifier is not easy to degrade, and it is only used in the field of textile dyeing.

Method used

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  • Esterquat-containing modified nano-cellulose as well as preparation method and application thereof
  • Esterquat-containing modified nano-cellulose as well as preparation method and application thereof
  • Esterquat-containing modified nano-cellulose as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A kind of ester group-containing quaternary ammonium salt modified nanocellulose is prepared by the following method:

[0026] (1) Dissolve 2g of nanocellulose powder in 100ml of deionized water, ultrasonically treat it for 15 minutes, and obtain a uniformly dispersed nanocellulose aqueous dispersion after fully stirring;

[0027] (2) Add 0.5 g of an ester-containing quaternary ammonium salt surfactant to the nanocellulose aqueous dispersion, heat up to 30° C., fully stir, and react for 2 hours to obtain a white suspension; ultrasonically treat the white suspension for 15 minutes, and then Centrifuge at 10000r / min, remove the supernatant, and obtain a white solid precipitate;

[0028] (3) The white solid precipitate was washed twice with deionized water, vacuum freeze-dried for 24 hours, and the obtained white solid was ground to obtain a powdery solid, that is, a quaternary ammonium salt-modified nanocellulose containing an ester group.

[0029] In the present embodim...

Embodiment 2

[0033] A kind of ester group-containing quaternary ammonium salt modified nanocellulose is prepared by the following method:

[0034] (1) 3 g of nanocellulose powder was dissolved in 100 ml of deionized water, ultrasonically treated for 15 minutes, and fully dispersed to obtain a uniformly dispersed nanocellulose aqueous dispersion;

[0035] (2) Add 0.75g of ester-containing quaternary ammonium salt surfactant to the nanocellulose aqueous dispersion, raise the temperature to 30°C, fully stir, and react for 2h to obtain a white suspension; ultrasonically treat the white suspension for 20min, and then Centrifuge at 10000r / min, remove the supernatant, and obtain a white solid precipitate;

[0036] (3) The white solid precipitate was washed twice with deionized water, vacuum freeze-dried for 24 hours, and the obtained white solid was ground to obtain a powdery solid, that is, a quaternary ammonium salt-modified nanocellulose containing an ester group.

[0037] In the present embo...

Embodiment 3

[0041] A kind of ester group-containing quaternary ammonium salt modified nanocellulose is prepared by the following method:

[0042] (1) Dissolve 4g of nanocellulose powder in 100ml of deionized water, ultrasonically treat it for 15 minutes, and obtain a uniformly dispersed nanocellulose aqueous dispersion after fully stirring;

[0043] (2) Add 1.3g of ester-containing quaternary ammonium salt surfactant to the nanocellulose aqueous dispersion, heat up to 35°C, stir well, and react for 3h to obtain a white suspension; ultrasonically treat the white suspension for 25min, and then Centrifuge at a speed of 11000r / min, remove the supernatant, and obtain a white solid precipitate;

[0044] (3) The white solid precipitate was washed twice with deionized water, vacuum freeze-dried for 24 hours, and the obtained white solid was ground to obtain a powdery solid, that is, a quaternary ammonium salt-modified nanocellulose containing an ester group.

[0045] In the present embodiment, t...

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Abstract

The invention belongs to the field of cellulose organic modification, and in particular relates to an esterquat-containing modified nano-cellulose as well as a preparation method and an application thereof. The esterquat-containing modified nano-cellulose is prepared through the method comprising the following steps: adding an esterquat-containing surfactant in a nano-cellulose aqueous dispersion, and obtaining a white suspension liquid after an adequate reaction; carrying out an ultrasonic treatment on the white suspension liquid, then centrifuging to remove a supernatant liquid, taking a white solid precipitate, and obtaining the esterquat-containing modified nano-cellulose after vacuum freeze-drying and grinding. According to the method disclosed by the invention, the nano-cellulose is modified by the esterquat-containing surfactant, the cationic surfactant is efficient and non-toxic, simple in synthesis method, high in positive charge density, and easy to degrade, and the ester group thereof is capable of effectively acting with a cellulose surface hydroxyl group, and effectively improving the compatibility between the nano-cellulose and many types of polar hydrophobic polymers (such as polylactic acid).

Description

technical field [0001] The invention belongs to the field of organic modification of cellulose, and in particular relates to an ester group-containing quaternary ammonium salt-modified nano-cellulose and a preparation method and application thereof. Background technique [0002] Cellulose is one of the most abundant natural organic substances in the world. Nanocellulose and its derivatives are widely used in the fields of textile, light industry, chemical industry, national defense, petroleum, medicine, energy, biotechnology and environmental protection. However, due to the aggregated structural characteristics of natural cellulose and the presence of many hydroxyl groups and high crystallinity between molecules and molecules, it cannot be dissolved in water and general organic and inorganic solvents, and it also lacks thermoplasticity and chemical corrosion resistance. The performance and strength are relatively poor, which is extremely unfavorable to its molding, processin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/06C08L67/04C08L1/08
Inventor 刘治田李洋张旗李超王成蔡雄吴瑶
Owner WUHAN INSTITUTE OF TECHNOLOGY
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