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

Nano cellulose membrane with better photo-thermal stability

A nanocellulose and film technology, applied in the field of nanocellulose, can solve the problems of poor transparency, low photothermal stability, aging, etc.

Inactive Publication Date: 2020-10-30
QINGDAO UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a nano-cellulose film with better photothermal stability and a preparation method thereof, which can effectively improve the light transmittance and photothermal stability of the cellulose film composite material; solve the problem of traditional cellulose film composite material photothermal Low stability, obvious aging phenomenon, poor transparency

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
  • Nano cellulose membrane with better photo-thermal stability
  • Nano cellulose membrane with better photo-thermal stability
  • Nano cellulose membrane with better photo-thermal stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Preparation ITA-LDHs

[0031] (a) According to the ratio of Mg:Al molar ratio of 2:1, accurately weigh 12.80gMgCO with an analytical balance 3 ·6H 2 O and 12.50gAl(NO 3 ) 3 9H 2 O, dissolve them in 100mL deionized water to prepare mixed salt solution, and pour the solution into a clean constant pressure funnel after the dissolution is complete. Accurately weigh 6.00gNaOH and 1.59gNa with an analytical balance 2 CO 3 Dissolve in 100mL deionized water to prepare a 0.15mol / L mixed alkali solution. After the solution is completely dissolved, pour the solution into another clean constant pressure funnel. Add 100mL deionized water to a 500mL three-necked flask in advance, and while fully stirring, drop the mixed salt solution and the mixed alkali solution into the three-necked flask at roughly the same speed (about 1 drop per second), and use 0.1mol / L NaOH solution to adjust the pH value to keep it at 10-11.

[0032] (b) After the dropwise addition, sti...

Embodiment 2

[0034] Embodiment 2: Preparation of ITA-LDH

[0035] (a) Accurately weigh 12.80g of MgCO with an analytical balance at a molar ratio of Mg:Al of 2.5:1 3 ·6H 2 O and 10.00gAl(NO 3 ) 3 9H 2 O, dissolve them in 100mL ionized water to prepare a mixed salt solution, and pour the solution into a clean constant pressure funnel after the dissolution is complete. Accurately weigh 8.00gNaOH and 2.12gNa with an analytical balance 2 CO 3 Dissolve in 100mL deionized water to prepare a 0.20mol / L mixed alkali solution. After the solution is completely dissolved, pour the solution into another clean constant pressure funnel. Add 100mL deionized water to a 500mL three-necked flask in advance, and while fully stirring, drop the mixed salt solution and the mixed alkali solution into the three-necked flask at roughly the same speed (about 1 drop per second), and use 0.1mol / L NaOH solution to adjust the pH value to keep it at 10-11.

[0036] (b) After the dropwise addition, stir for 1 h, ...

Embodiment 3

[0039] Embodiment 3: Preparation of cellulose nanocrystals (CNCs) material method with high crystallinity and low oxidation degree obtained by hydrolysis of p-toluenesulfonic acid

[0040](a) Add the required amount of p-toluenesulfonic acid and deionized water into a 150 mL three-necked flask to prepare a p-toluenesulfonic acid solution with a mass concentration of 50%-80%.

[0041] (b) After heating to 70°C, add 3g of pulverized pulp, wherein the solid-to-liquid ratio is 1:20, use a stirrer to keep the suspension at 200rpm, react for 4h, add 50ml of deionized water to terminate the reaction.

[0042] (c) Centrifuge the product obtained by the reaction, and repeatedly centrifuge at 4000 rpm for 10 minutes to remove spent acid until the supernatant is neutral. Continue centrifugation to separate the CNCs from the hydrolyzed macromolecular cellulose.

[0043] (d) freeze-drying the obtained CNCs suspension to obtain CNCs.

[0044] (e) The spent acid was filtered to remove impu...

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
particle sizeaaaaaaaaaa
crystallinity indexaaaaaaaaaa
Login to View More

Abstract

The invention provides a nano cellulose membrane with better photo-thermal stability and a preparation method thereof. The light transmittance and the photo-thermal stability of a cellulose membrane composite material can be effectively improved; the problems that a traditional cellulose membrane composite material is low in photo-thermal stability, obvious in aging phenomenon and poor in transparency are solved. The preparation method disclosed by the invention is mild in reaction condition and short in reaction period; the operation is simple; and the product repeatability is good. The prepared nanocellulose membrane shows good thermal stability in a suspension, and the crystallinity index is as high as 93.0% or above. P-toluenesulfonic acid is recovered by a crystallization technology,and the recovery rate exceeds 70.0%. The CNCs have the average diameter of 5.0 nm and the average length of 100.0 nm, the specific surface area is smaller, and the CNCs are more uniformly dispersed onthe membrane. By adopting the method to prepare the composite material, the problem of rapid aging of the nanofiber membrane material is obviously solved.

Description

technical field [0001] The invention belongs to the technical field of nanocellulose, and in particular relates to a nanocellulose film with better photothermal stability. Background technique [0002] As natural renewable materials are receiving more and more attention, cellulose, as the most abundant natural polymer material on earth, is regarded as a hot choice for future functional material processing. Cellulose nanocrystals can be prepared from natural cellulose through unit reactions such as hydrolysis and oxidation. Cellulose nanocrystalline material CNCs has many excellent properties, such as biocompatibility, large specific surface area, high mechanical strength, high modulus, high crystallinity, biodegradability, hydrophilicity, and good optical properties. Composite materials based on CNCs can be used as materials with certain needs, such as photothermal stability and rigid properties, and can be used as functional materials in the fields of gels, optoelectronics...

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): C08J5/18C08L1/04C08K9/04C08K3/28
CPCC08J5/18C08J2301/04C08K9/04C08K3/28
Inventor 王松林王倩宋宗佳
Owner QINGDAO UNIV OF SCI & TECH