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Citric acid-modified nanometer zinc oxide

A technology of nano-zinc oxide and citric acid, which is applied in the field of nano-materials, can solve the problems of easy agglomeration of nano-zinc oxide, and achieve the effects of not being easy to agglomerate, inhibiting dissolution, and improving dispersibility

Active Publication Date: 2015-10-28
苏州远略知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of citric acid modified nano-zinc oxide for the problem that nano-zinc oxide is easy to agglomerate in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Dissolve 5g of citric acid in 50mL of deionized water to form a solution, adjust the pH of the solution to 4, add 5g of nano-zinc oxide, and stir at high speed;

[0017] 2) Carry out constant temperature reflux reaction, the reaction temperature is 80°C, and the reaction time is 2h. After the reaction is completed, suction filtration is performed, washed to pH=7, and then dried in an oven to obtain modified nano-zinc oxide.

Embodiment 2

[0019] 1) Dissolve 10g of citric acid in 50mL of deionized water to form a solution, adjust the pH of the solution to 4, add 5g of nano-zinc oxide, and stir at high speed;

[0020] 2) Carry out constant temperature reflux reaction, the reaction temperature is 85°C, and the reaction time is 1h. After the reaction is completed, suction filtration is performed, washed to pH=7, and then dried in an oven to obtain modified nano-zinc oxide.

Embodiment 3

[0022] 1) Dissolve 15g of citric acid in 50mL of deionized water to form a solution, adjust the pH of the solution to 4, add 5g of nano-zinc oxide, and stir at high speed;

[0023] 2) Carry out constant temperature reflux reaction, the reaction temperature is 90°C, and the reaction time is 1h. After the reaction is completed, suction filtration is performed, washed to pH = 7, and then dried in an oven to obtain modified nano-zinc oxide.

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PUM

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Abstract

The invention relates to the technical field of nano-materials, and particularly discloses a citric acid-modified nanometer zinc oxide. The nanometer zinc oxide is prepared through the steps of 1) dissolving the citric acid in deionized water to form a solution, adjusting the pH value of the solution to be 4, adding the nanometer zinc oxide and stirring at a high speed; 2) conducting the constant reflux reaction, controlling the reaction temperature and the reaction time of the constant reflux reaction to be 80-95 DEG C and 0.5-2 hours respectively, conducting the suction filtration after the completion of the constant reflux reaction, washing to enable the pH value of the solution to be 7, and drying in a baking oven to obtain the modified nanometer zinc oxide. The citric acid is adopted for being subjected to the bonding reaction with hydroxyl groups on the surface of the nanometer zinc oxide, so that nanometer zinc oxide particles are less prone to agglomeration. The dispersibility of nanometer zinc oxide particles is improved. Furthermore, the silicon deposition and modification is conducted on the surface of the nanometer zinc oxide, so that the dissolution of zinc is inhibited. Therefore, the dispersibility of the nanometer zinc oxide is improved.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a citric acid-modified nanometer zinc oxide. Background technique [0002] Nano-zinc oxide is an inorganic ultraviolet shielding agent with excellent performance, which is widely used in sunscreen cosmetics, nano-functional textiles, functional plastics and coatings and other fields. However, nano-zinc oxide is an inorganic oxide with small size and high surface energy, and it is difficult to be compatible with organic components, so it is easy to cause serious agglomeration. Therefore, it is necessary to modify the surface of nano zinc oxide. [0003] Patent ZL200910064705.9 discloses a nano-zinc oxide surface modification method, which includes steps: 1) dispersing nano-zinc oxide powder in a mixed solution of deionized water and co-solvent; 2) adding tetraethyl orthosilicate And / or the modifier composed of tetramethyl orthosilicate and organosilane is...

Claims

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Application Information

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IPC IPC(8): C01G9/02B82Y30/00
Inventor 左士祥张宇
Owner 苏州远略知识产权运营有限公司