Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Full-broad-spectrum ultraviolet absorption carbon quantum dot as well as preparation method and application thereof

A technology of carbon quantum dots and external absorption, applied in the field of ultraviolet absorber synthesis, can solve the problems of yellowing of materials, affecting the transmittance of solution, less research on the ultraviolet absorption characteristics of water-soluble carbon dots, etc., and achieves high acid and alkali resistance. Effect

Active Publication Date: 2022-03-25
SOUTH CHINA AGRI UNIV
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the UV absorption characteristics and applications of water-soluble carbon dots.
Although some researchers use a single strong UVA absorber as an ultraviolet absorber, as the concentration increases, full UV absorption can be achieved, but high concentrations will seriously affect the transmittance of the solution, so the prepared materials often have yellowing phenomenon

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
  • Full-broad-spectrum ultraviolet absorption carbon quantum dot as well as preparation method and application thereof
  • Full-broad-spectrum ultraviolet absorption carbon quantum dot as well as preparation method and application thereof
  • Full-broad-spectrum ultraviolet absorption carbon quantum dot as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1g of citric acid (CA), 0.5g of proline (PEI), benzoic acid (OPD) variable (0.3g, 0.5g, 0.7g, 1.0g), add 20mL of deionized water, ultrasonic 30min to dissolve all the solids Then the reaction solution was placed in a 50mL reactor, reacted at 180°C for 6h, and after cooling to room temperature, it was dialyzed with a 1000Da dialysis bag for 24h, and most of the water was removed by rotary evaporation, and freeze-dried to obtain full-broad-spectrum UV-absorbing carbon quantum dots. This embodiment adds the ultraviolet absorption spectrum of different quality benzoic acid such as Figure 5 As shown, the UV transmittance test results are shown in Table 1.

[0033] The ultraviolet light transmittance test result of the carbon quantum dots of table 1 embodiment 1 gained

[0034]

[0035] (The concentration is 7.0*10 -2 mg / mL, the intensity is expressed as a percentage, and the maximum intensity is 1.0)

[0036] It can be seen from the data in Table 1 that citric a...

Embodiment 2

[0041] Weigh 1 g of raw material 1 (citric acid or sodium citrate), 0.5 g of raw material 2 (oxygen-containing unsaturated organic compound), 0.5 g of raw material 3 (nitrogen-in-cyclic compound), add 20 mL of deionized water, and ultrasonicate for 30 min. All the solids were dissolved, and the reaction solution was placed in a 50mL reactor, and reacted at 180°C for 6h. After cooling to room temperature, it was dialyzed with a 1000Da dialysis bag for 24h. Most of the water was removed by rotary evaporation, and freeze-dried to obtain full-broad-spectrum UV-absorbing carbon quantum dots.

[0042] Raw material 1 is specifically citric acid or sodium citrate

[0043] Raw material 2 (oxygen-containing unsaturated organic compound) is specifically 4-propyl-5-hexen-1-ol, 3-phenyl-2-propen-1-ol, 1-methylcyclopentanol, 6-methanol phenyl-2-cyclohexen-1-ol, benzoic acid, 1-[3-(trimethoxysilyl)propyl]urea, phenylacetic acid, 1-phenyl-2-propanol, cyclohexanol or benzyl alcohol.

[0044]...

Embodiment 3

[0051] Embodiment 3 (secondary product):

[0052] CDs / PE films were prepared by uniformly adding different contents (0-1.0g) of full-broad-spectrum UV-absorbing carbon quantum dots CDs (prepared from 1g citric acid, 0.5gPEI and 0.7gOPD) in PE. The detailed steps are: pre-mix PE and CDs of different qualities through simple manual vibration, then put the mixture into the twin-screw extruder, and obtain uniform CDs / PE color masterbatch according to the conventional way of preparing masterbatches grain. Using the prepared CDs / PE masterbatch as raw material, the film was blown by a film blowing machine to obtain a CDs / PE film with a thickness of 80 μm. The transmittance is shown in Table 3.

[0053] Table 3 Transmittance of CDs / PE films with different contents

[0054]

[0055]

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
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of synthesis of ultraviolet absorbents, and discloses a full-broad-spectrum ultraviolet absorption carbon quantum dot as well as a preparation method and application thereof. The carbon quantum dot is prepared from the following raw materials in parts by mass: 0.2 to 1.0 part of citric acid or sodium citrate, 0.2 to 0.8 part of an oxygen-containing unsaturated organic compound and 0.2 to 0.8 part of a nitrogen-in-ring compound. The full-broad-spectrum and acid-base-resistant full-broad-spectrum ultraviolet absorption carbon quantum dot with 100% UVB absorption and 91% or above UVA absorption is prepared, full-broad-spectrum absorption can be achieved through an ultraviolet absorption spectrum test only by adding a small amount of the carbon quantum dot, visible light transmission is not affected at all, the acid-base resistance is high, and the carbon quantum dot has good application prospects. And the solution is always kept clear, so that the yellowing phenomenon of the film is avoided during secondary application.

Description

technical field [0001] The invention belongs to the technical field of ultraviolet absorber synthesis, and in particular relates to a full-broad-spectrum ultraviolet-absorbing carbon quantum dot and its preparation method and application. Background technique [0002] Sunlight is the main energy source of the earth, providing abundant energy for photosynthesis and heat for atmospheric circulation and water circulation. This radiant energy reaching the Earth's surface is essential for all living things. The solar spectrum has three main bands, ultraviolet (UV), visible (VIS) and infrared (IR). At the Earth's surface, ultraviolet radiant energy accounts for about 5% of incident radiation, visible light 43%, and infrared light 52%. Ultraviolet radiation can be divided into UVA (400nm-315nm) according to wavelength. UVB(315nm-280nm) and UVC(280nm-100nm). When ultraviolet radiation is excessively irradiated on the human body or organism, there will be great changes in physiol...

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): C09K11/65B82Y20/00B82Y40/00C01B32/15A61K8/19A61Q17/04C08L23/06C08K3/04C08J5/18
CPCC09K11/65C09K11/0883B82Y20/00B82Y40/00C01B32/15A61K8/19A61Q17/04C08J5/18C08J2323/06C08K3/04
Inventor 刘应亮邱婕敏徐智强叶炜浩陈聪聪
Owner SOUTH CHINA AGRI UNIV
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
Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com