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Preparation method of nanometer fibrillated cellulose capable of being re-dispersed in water after drying

A technology of nanofibrillation and water redispersion, which is applied in the field of preparation of water-redispersed nanofibrillation cellulose after drying, can solve problems such as hard agglomeration, achieve inhibition of agglomeration, weaken interaction, and simple and easy preparation method Effect

Inactive Publication Date: 2019-06-25
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a kind of nanofibrillated cellulose through physical modification of the surface, which can effectively solve the problems caused by hydrogen bonding between nanofibrillated celluloses in the drying process. Problems with hard agglomeration, allowing it to redisperse evenly in aqueous media

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of water-redispersed nanofibrillated cellulose after drying, the operations are as follows:

[0037] Nanofibrillated cellulose with an average particle size of less than 100 nm is prepared by TEMPO catalytic oxidation pretreatment combined with high-pressure homogenized softwood pulp;

[0038] Select sodium carboxymethyl cellulose;

[0039] Use deionized water to prepare 5L of mixed solution of nanofibrillated cellulose and sodium carboxymethyl cellulose, the system concentration of nanofibrillated cellulose is between 0.1wt% and 2.0wt%, and the concentration is selected as 1.0wt% in this embodiment; The addition amount of sodium carboxymethyl cellulose is 0-300mg / g nanofibrillated cellulose, and in this embodiment, the addition amount is 50mg / g nanofibrillated cellulose; Stir, ultrasonically vibrate or stand, and the blending time is 0.5h to 5h. In this embodiment, high-speed stirring is performed for 2h under the condition that the temperature is...

Embodiment 2

[0053] A preparation method of water-redispersed nanofibrillated cellulose after drying, the preparation steps are the same as those in Example 1, but the difference is:

[0054] 5L of mixed solution of nanofibrillated cellulose and sodium carboxymethyl cellulose is prepared with deionized water, and the system concentration of nanofibrillated cellulose is between 0.1wt% and 2.0wt%, and the concentration is selected as 2.0wt% in this embodiment; The addition amount of sodium carboxymethyl cellulose is 0-300 mg / g nanofibrillated cellulose, and in this embodiment, the addition amount is 100 mg / g nanofibrillated cellulose; Stirring, ultrasonic vibration or standing, the blending time is 0.5h ~ 5h, in this embodiment, the temperature is selected to be 40 ° C under the condition of first high-speed stirring for 2.5h, and then ultrasonic vibration for 2.5h, to obtain sodium carboxymethylcellulose Mixed with nanofibrillated cellulose, set aside.

[0055] The mixed solution of sodium...

Embodiment 3

[0068] A preparation method of water-redispersed nanofibrillated cellulose after drying, the preparation steps are the same as those in Example 1, but the difference is:

[0069] Use deionized water to prepare 5L of mixed solution of nanofibrillated cellulose and sodium carboxymethyl cellulose, the system concentration of nanofibrillated cellulose is between 0.1wt% and 2.0wt%, and the concentration is selected as 0.1wt% in this embodiment; The addition amount of sodium carboxymethyl cellulose is 0-300 mg / g nanofibrillated cellulose, and in this embodiment, the addition amount is 150 mg / g nanofibrillated cellulose; Stir, ultrasonically vibrate or stand, and the blending time is 0.5h to 5h. In this embodiment, the temperature is selected to be 25 ° C. First, high-speed stirring is performed for 3h, and then ultrasonic vibration is performed for 0.5h to obtain sodium carboxymethylcellulose and Nanofibrillated cellulose mixed solution, ready for use.

[0070] The mixed solution o...

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Abstract

The invention discloses a preparation method of nanometer fibrillated cellulose capable of being re-dispersed in water after drying, and belongs to the technical field of nanometer cellulose preparation. According to the present invention, nanometer fibrillated cellulose is physically modified with an anionic polymer electrolyte sodium carboxymethyl cellulose, and the obtained nanometer fibrillated cellulose and sodium carboxymethyl cellulose mixed solution is dried by an experimental fluidized bed granulator and a freeze drying machine to prepare powdery or microparticle-like nanometer fibrillated cellulose solid, wherein the nanometer fibrillated cellulose solid can be uniformly re-dispersed in an aqueous medium due to the weakening of the agglomeration caused by hydrogen bonding; and the preparation of the re-dispersible nanometer fibrillated cellulose provides convenience in storage, transportation and subsequent applications.

Description

technical field [0001] The invention relates to a preparation method of water-redispersed nanofibrillated cellulose after drying. Background technique [0002] Nanocellulose (Nanocellulose or Nano-sized cellulose, NC) refers to biomass-based nanomaterials that reduce any dimension of cellulose to within 100 nm (usually less than 100 nm in diameter) by mechanical, chemical or other methods. It has many excellent properties, such as degradability, biocompatibility, high strength, high crystallinity, high Young's modulus, high hydrophilicity and large specific surface area, etc. It is used in reinforced composite materials, bendable displays, solar energy Batteries, drug carriers, automotive interior parts, filter materials, adsorption materials, biomedical materials and other fields have great potential application prospects. [0003] Previous studies have found that the drying problem of all nanocellulose is due to the easy formation of irreversible hard agglomeration of nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L1/02C08L1/28
Inventor 倪建萍
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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