Preparation method of nano-cellulose-induced titanium dioxide composite ultraviolet shielding material

A nanocellulose, titanium dioxide technology, applied in the direction of radiation-absorbing coatings, etc., can solve the problems of insufficient stability of coated composite nanoparticles, poor solvent dispersion of the matrix, insufficient stability, etc., to improve the anti-ultraviolet ability and improve the ultraviolet Shielding effect, effect of improving stability and key energy

Pending Publication Date: 2020-12-15
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN106633967A uses quaternized lignin and anionic surfactant to compound and add it to the titanium dioxide suspension, then add water for self-assembly and aging to obtain titanium dioxide / lignin-based composite nanoparticles. The stability of coated composite nanoparticles is insufficient, and there are certain problems in the dispersion in the matrix
Therefore, based on the analysis of the above documents, the existing methods such as physical electrostatic compounding and self-assembly still have the problems of insufficient stability, low binding force, poor dispersion in matrix solvents, and easy agglomeration.

Method used

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  • Preparation method of nano-cellulose-induced titanium dioxide composite ultraviolet shielding material
  • Preparation method of nano-cellulose-induced titanium dioxide composite ultraviolet shielding material
  • Preparation method of nano-cellulose-induced titanium dioxide composite ultraviolet shielding material

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Embodiment 1

[0027] Embodiment 1: A preparation method of nanocellulose-induced titanium dioxide composite ultraviolet shielding material, carried out according to the following steps:

[0028] a, adding 0.8g of sodium lignosulfonate to 15mL of mass concentration by mass is 0.8% nanocellulose suspension (nanocellulose is called CNC for short, is a kind of macromolecule material from natural fibers, nontoxic and nontoxic The irritating smell is a linear polymer composed of glucosyl groups and β-1,4-glycosidic bonds), stir to mix and disperse, then add 20ml of absolute ethanol, stir rapidly for 6 minutes, and then heat up to 75°C. Keep stirring for 27 minutes to obtain the nanocellulose template induction reagent;

[0029]b. Add 4 mL of butyl titanate to the nanocellulose template induction reagent, stir during the dropwise addition, and continue to stir for 23 minutes after the dropwise addition to form a mixed solution of the titanium dioxide precursor and the template induction reagent; ...

Embodiment 2

[0032] Embodiment 2: A preparation method of nanocellulose-induced titanium dioxide composite ultraviolet shielding material, carried out according to the following steps:

[0033] a. Add 0.4 g of sodium lignosulfonate in parts by mass to 10 mL of nanocellulose suspension with a mass concentration of 1.2%, stir to mix and disperse, then add 30 ml of absolute ethanol, stir rapidly for 4 minutes, and then heat up to 90°C, keep stirring for 20 minutes to obtain a nanocellulose template-induced reaction agent;

[0034] b. Add 6 mL of butyl titanate to the nanocellulose template induction reagent, stir during the dropwise addition, and continue stirring for 18 minutes after the dropwise addition to form a mixed solution of the titanium dioxide precursor and the template induction reagent;

[0035] c. Slowly add 2ml of sulfuric acid solution with a mass concentration of 23% dropwise into the mixed solution of the above-mentioned titanium dioxide precursor and the template-inducing r...

Embodiment 3

[0036] Embodiment 3: A preparation method of nanocellulose-induced titanium dioxide composite ultraviolet shielding material, carried out according to the following steps:

[0037] a. Add 0.5 g of sodium lignosulfonate in parts by mass to 10 mL of nanocellulose suspension with a mass concentration of 1%, stir to mix and disperse, then add 25 ml of absolute ethanol, stir rapidly for 5 minutes, and then heat up to 80°C, keep stirring for 30 minutes, and finally obtain the nanocellulose template induction reaction agent; add perfluorooctyltrichlorosilane during the stirring process, so that after the nanocellulose is modified by the reaction of perfluorooctyltrichlorosilane, as Figure 7 As shown, a nanocluster is attached to the surface of sodium lignosulfonate, and the nanocluster is used to improve the stability and bond energy of the chemical bond formed by the oxygen-containing functional group of lignin and the titanium dioxide precursor, so as to subsequently increase the g...

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Abstract

The invention discloses a preparation method of a nano-cellulose-induced titanium dioxide composite ultraviolet shielding material. The method comprises the following steps: adding 0.1-1 part by massof sodium lignin sulfonate into 5-15 parts by mass of 0.5-1.5% nano-cellulose suspension, stirring, adding 20-30 parts by mass of anhydrous ethanol, performing quick stirring for 3-8 minutes, performing heating to 70-90 DEG C, and keeping stirring for 25-35 minutes to obtain a nano cellulose template-induced reactant; adding 3-8 parts of butyl titanate into the reactant, performing stirring in thewhole dropwise adding process, and continuously performing stirring for 15-25 minutes after dropwise adding to form a mixed solution of a titanium dioxide precursor and the template-induced reactant;and slowly dropwise adding 1-5 parts of sulfuric acid solution with a mass concentration of 15-25% into the mixed solution, inducing lignin to be separated out to form lignin-coated suspension, and finally transferring the lignin-coated suspension into a reaction kettle for reaction to obtain a finished product. The ultraviolet shielding material prepared by the method is not easy to agglomerate,has good compatibility with various organic solvents, and has excellent ultraviolet resistance.

Description

technical field [0001] The invention relates to the technical field of ultraviolet shielding materials, in particular to a method for preparing a nanocellulose-induced titanium dioxide composite ultraviolet shielding material. Background technique [0002] In recent years, with the destruction of the ozone layer, it is very necessary to choose suitable materials for UV protection. Titanium dioxide is currently the most widely used physical UV shielding compound. However, because titanium dioxide is generally nanoscale, it has disadvantages such as easy aggregation, poor dispersion, and photoelectric free radicals generated by photocatalysis. Therefore, it is often necessary to modify the surface of titanium dioxide to improve the above defects. Inorganic coatings are generally treated closely with metal oxides such as aluminum, silicon, and zirconium, but cannot achieve good dispersion in the matrix. The use of coupling agents, surfactants or polymers for organic coating m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L97/00C08L1/02C08K3/22C09D5/32C08K9/10
CPCC08J3/12C09D5/32C08K9/10C08K3/22C08J2397/00C08J2401/02C08J2301/02C08J2497/00C08K2003/2241C08K2201/011
Inventor 郭大亮张金猛沙力争刘蓓赵会芳李静许银超张欣
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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