Continuous nanometer TiO2 surface treatment method

Abstract

The invention discloses a continuous nanometer TiO2 surface treatment method. Nanometer TiO2 is obtained through technologies of freeze drying, silicon or aluminium coating, organosilane or long-chainfatty acid modification and the like. According to the continuous nanometer TiO2 surface treatment method, inorganic surface treatment and organic surface treatment of the nanometer TiO2 are organically combined, the continuous nanometer TiO2 surface treatment method has the characters that a technology process is short, operation is continuous and convenient, and control is easy; the nanometer TiO2 is suitable for industrial production; meanwhile, prepared nanometer TiO2 powder not only has good hydrophobicity, but also has excellent photostability, and the application fields of a product are further expanded.

Description

technical field [0001] The invention belongs to the field of preparation and modification of nano functional materials, in particular to a continuous nano TiO 2 The method of surface treatment. Background technique [0002] Nano titanium oxide (TiO 2 ) is a new type of inorganic UV shielding material, which is widely used in sunscreen cosmetics, coatings, plastics and chemical fibers. Due to its small particle size and high specific surface energy, it is easy to agglomerate and cannot fully utilize many properties of the nanomaterial; at the same time, TiO 2 It has strong photochemical activity, and it is easy to cause discoloration and degradation of organic matter in the system under sunlight irradiation; moreover, its surface is hydrophilic and oleophobic, and is suitable for use in polar systems, such as aqueous solutions and alcohol systems, etc. . If it is added to organic application systems such as rubber, chemical fibers, plastics, inks, solvent-based coatings, ...

AI Technical Summary

Problems solved by technology

Through inorganic coating (generally using soluble inorganic salts and ions themselves on nano-TiO 2 The flocculation and agglomeration have a certain influence) to solve the problem of photoactivity and agglomeration; through organic modification to solve the disadvantages of poor compatibility in the organic phase; and they are often viewed in isolation, and there are few organic combinations of them up to study

For example: Chinese patent CN1454939A will nano-TiO 2 The slurry is maintained at a certain temperature at a certain pH value, and at the same time, sodium aluminate solution and sulfuric acid solution are added dropwise to coat alumina on its surface, without involving nano-TiO 2 organic surface treatment

And Chinese patent CN1982349A uses tetrabutyl titanate to nano-TiO 2 Surface pretreatment followed by surface polymerization with methyl methacrylate, although improved nano-TiO 2 Dispersion and stability in the organic phase, but due to the lack of inorganic surface treatment, resulting in nano-TiO 2 The field of application is very limited