Efficient cellulose nanocrystalline preparing method

A technology of cellulose and nanocrystals, which is applied in the post-treatment of cellulose pulp, fiber raw material treatment, papermaking, etc., can solve the problems of no pretreatment steps, etc., and achieve the improvement of reaction accessibility, easy control, and reaction conditions mild effect

Active Publication Date: 2016-07-20
QINGDAO UNIV OF SCI & TECH
View PDF3 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned various methods of preparing cellulose nanocrystals, the cellulose raw material is directly processed, and there is no pretreatment step

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
  • Efficient cellulose nanocrystalline preparing method
  • Efficient cellulose nanocrystalline preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Break 5 grams of pulp cellulose into cotton wool with a mixer, add 250ml, 4wt% NaOH solution, soak for 24 hours, then use deionized water to filter and wash it to neutral, and take this alkali-pretreated fiber prime, add 0.078 g CuSO 4 ·5H 2 0, add 90 milliliters of 64wt% sulfuric acid again, after stirring at 50 DEG C for 40min, add deionized water to terminate the reaction, after the solution is allowed to stand, centrifuge for 10min at a speed of 8000rpm / min with a high-speed centrifuge, then precipitate washing, Separate again until the supernatant becomes cloudy. The obtained cellulose nanocrystal suspension was ultrasonicated to obtain a stable cellulose nanocrystal suspension. The average size of the obtained cellulose crystal grains was measured to be about 160 nm, the yield was 77%, and the PDI was 1.5.

Embodiment 2

[0037] The types of raw materials used, the dosage and the process flow are the same as in Example 1, except that the soaking time of pulp cellulose in NaOH solution is extended to 72 hours to obtain a stable suspension of cellulose nanocrystals. The size is about 150 nm, the yield is 81%, and the PDI is 1.4.

Embodiment 3

[0039] After soaking 5g of α-cellulose with 250ml, 4wt% NaOH solution for 48 hours, filter and wash with deionized water until neutral, take this alkali-pretreated cellulose, add 0.078 gram of CuSO 4 ·5H 2 O, add 100 ml of 64wt% sulfuric acid, stir at 50°C for 1.5h, then add deionized water to stop the reaction, after the solution is allowed to stand, centrifuge at a speed of 8000rpm / min for 10min with a high-speed centrifuge, and then wash the precipitate , and separated again until the supernatant became cloudy. The obtained cellulose nanocrystal suspension was ultrasonicated to obtain a stable cellulose nanocrystal suspension with an average particle size of about 200 nm, a yield of 83%, and a PDI of 1.5.

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
sizeaaaaaaaaaa
sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides an efficient and quick cellulose nanocrystalline preparing method.According to the method, a cellulose raw material is pretreated with aqueous alkali and then subjected to acidolysis, and inorganic salt containing metal ions is added during acidolysis to serve as a promoter to promote acidolysis reaction.Reaction condition is mild and easy to control, raw materials needed by reaction are simple and easy to obtain, and the method can be widely applied to preparation of cellulose nanocrystalline from various cellulose raw materials.

Description

【Technical field】 [0001] The invention belongs to the field of nanomaterial preparation and also belongs to the field of macromolecules, in particular to a method for preparing cellulose nanocrystals. 【Background technique】 [0002] Natural cellulose is the most abundant biomass material in nature, and its annual output can reach 1.5×10 12 Ton. Cellulose nanocrystals with nanometer size can be obtained by extracting the crystalline regions of cellulose. Cellulose nanocrystals have many excellent properties, such as it has a large aspect ratio, and the length varies from hundreds of nanometers to several microns; it has high mechanical strength, and its Young's modulus is similar to that of aramid fibers It is higher than steel, and its tensile strength is similar to that of aluminum; cellulose nanocrystals have good thermal stability, and the thermal expansion coefficient is generally below 0.1ppm / K, which is comparable to carbon fiber. Cellulose nanocrystals can be orien...

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): C08B15/02D21C9/00D21C9/02
CPCC08B15/02D21C9/004D21C9/02
Inventor 周丽娟张建明段咏欣
Owner QINGDAO UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap