Unlock instant, AI-driven research and patent intelligence for your innovation.

Low-temperature hydrothermal method for preparing nanocellulose suspension

A technology of nanocellulose and suspension, which is applied in the field of low-temperature hydrothermal preparation of nanocellulose suspension, which can solve the problems of easy carbonization and achieve the effect of small corrosion, small size, and uniform dispersion

Active Publication Date: 2021-07-09
HUAFANG +1
View PDF13 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art that strong acid is used in the preparation of nanocellulose by hydrothermal method, and the ultra-low acid content requires high temperature reaction and easy carbonization, the present invention provides a method for preparing nanocellulose suspension by low temperature hydrothermal method, which is carried out under low temperature conditions Hydrothermal reaction avoids cellulose carbonization and does not require the use of catalysts such as strong acids

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low-temperature hydrothermal method for preparing nanocellulose suspension
  • Low-temperature hydrothermal method for preparing nanocellulose suspension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add microcrystalline cellulose to ethanol-water solution, including 3.3 g of microcrystalline cellulose, 15 mL of ethanol, and 50 mL of distilled water. After ultrasonic treatment for 30 min at an ultrasonic power of 300 W, transfer it to a hydrothermal reaction kettle, add 1 g of hydroxylamine hydrochloride, and React at 85°C for 8 hours, then cool to room temperature, add distilled water, wash 3 times, and then centrifuge. The centrifugation conditions are 500r / min and 50min. liquid. The obtained nanocellulose has a diameter of about 10-50nm and a length of 50-500nm.

Embodiment 2

[0029] Add microcrystalline cellulose to the ethanol-water solution, including 4.0g of microcrystalline cellulose, 15mL of ethanol, and 50mL of distilled water. After ultrasonic treatment for 50min under the condition of ultrasonic power of 100W, transfer it to a hydrothermal reaction kettle, add 1.5g of hydroxylamine hydrochloride, Under neutral conditions, react at 95°C for 8h and then cool down. Distilled water was added to the residue, washed 3 times, and then centrifuged. The centrifugal separation conditions were 1000r / min and 30min. The collected supernatant was the nanocellulose suspension. The obtained nanocellulose has a diameter of about 10-50nm and a length of 50-500nm.

Embodiment 3

[0031] Add microcrystalline cellulose to ethanol-water solution, wherein 2 g of microcrystalline cellulose, 10 mL of ethanol, and 50 mL of distilled water are sonicated for 30 min under the condition of ultrasonic power of 200 W, and then transferred to a hydrothermal reaction kettle, 0.8 g of hydroxylamine hydrochloride is added, and React under neutral conditions at 105°C for 7.5h and then cool. Distilled water was added to the residue, washed 3 times, and then centrifuged. The centrifugal separation conditions were 1000 r / min and 30 min. The separated supernatant was collected to obtain the nanocellulose suspension. The obtained nanocellulose has a diameter of about 10-50nm and a length of 50-500nm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of nanofiber fiber preparation, in particular to a low-temperature hydrothermal method for preparing a nanocellulose suspension. The method comprises the following steps: adding a cellulose raw material into an ethanol-water solution, carrying out ultrasonic treatment, adding a catalyst, reacting at 85-115 DEG C, and carrying out post-treatment to obtain the nanocellulose suspension. According to the method, the characteristic that the boiling point of the ethanol-water solution is lower than that of water is utilized, and the ethanol-water solution replaces water to serve as a solvent, so that the problem that cellulose is easily carbonized due to overhigh hydrothermal temperature is solved; and hydroxylamine hydrochloride is used as a catalyst, so that use of strong acid, oxidizing agent and the like is avoided, and the method has wide industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of nanocellulose preparation, in particular to a low-temperature hydrothermal preparation method for nanocellulose suspension. Background technique [0002] Cellulose is one of the most abundant natural polymers in nature. Among them, nanocellulose has broad application prospects in the field of materials due to its high mechanical properties and low thermal expansion coefficient. According to the length, nanocellulose can be divided into nanocrystalline cellulose / cellulose nanocrystal and cellulose nanofiber. [0003] The commonly used preparation method of nanocellulose is hydrothermal method. When preparing nanocellulose by hydrothermal method, a small amount of hydrochloric acid, hydrochloric acid, etc. are used as catalysts, but strong acid is highly corrosive to equipment, and the treatment of waste acid will cause environmental pollution; or ultra-low acid content (acid mass fraction is 0.05 -0.1%),...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L1/04
CPCC08J3/03C08J2301/04
Inventor 孙红玉闫英山邓慧王力民盛春英郭春辉田峰任晓宁王光星刘晓敏赵姗姗刘玉玺
Owner HUAFANG