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

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...

AI Technical Summary

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.

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