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Hydrothermal synthesis method of zinc borate whisker

A technology of hydrothermal synthesis and zinc borate, which is applied in the directions of borates, zinc compounds, boron oxide compounds, etc., can solve the problems of complicated follow-up treatment of mother liquor, and achieves easy control of morphology, simple recovery process and good microscopic appearance. Effect

Active Publication Date: 2013-06-19
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of zinc borate whiskers in China is mostly focused on adding surfactants to prepare nano-scale zinc borate whisker powders. However, due to the addition of surfactants in the system, the follow-up treatment of the mother liquor is correspondingly complicated.

Method used

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  • Hydrothermal synthesis method of zinc borate whisker

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 Zinc borate whisker hydrothermal synthesis new method, this method refers to that at first borax is mixed with the solution that mass percent concentration is 4.25% in the there-necked bottle of 0.5L; Then, in this solution, add mass percent concentration It is 33.0% zinc sulfate solution, adjust the mol ratio of zinc sulfate and borax to be 1.6: 1, obtain the slurry after stirring evenly; Secondly, place the slurry in a 0.5L reactor, and adjust the filling degree in the reactor to 70 %, at the same time, the reaction kettle was heated to 120°C, and after a constant temperature reaction for 16 hours, it was cooled to room temperature to obtain a white precipitate, which was aged for 8 hours and then sampled; finally, the precipitate was filtered and washed until no other ions existed, and then the Dry at 70°C for 5 hours to obtain zinc borate whisker powder.

Embodiment 2

[0020] Embodiment 2 The new method of hydrothermal synthesis of zinc borate whiskers, this method refers to that first borax is mixed with the solution that the mass percent concentration is 3.75% in the there-necked bottle of 0.5L; Then, in this solution, add the mass percent concentration Be 35.2% zinc nitrate solution, adjust the mol ratio of zinc nitrate and borax to be 2: 1, obtain slurry after stirring; Next, place slurry in 0.5L reactor, and adjust the filling degree in the reactor to 70 %, at the same time, the temperature of the reactor was raised to 160°C, and after constant temperature reaction for 1 hour, it was cooled to room temperature to obtain a white precipitate. Dry at 90°C for 4 hours to obtain zinc borate whisker powder.

Embodiment 3

[0021] Embodiment 3 The new method of hydrothermal synthesis of zinc borate whiskers, this method refers to that at first borax is mixed with the solution that the mass percent concentration is 3.46% in the there-necked bottle of 0.5L; Then, in this solution, add the mass percent concentration It is 20.9% zinc chloride solution, adjust the molar ratio of zinc chloride and borax to be 2.2: 1, obtain the slurry after stirring evenly; secondly, place the slurry in a 0.5L reactor, and adjust the filling degree in the reactor At the same time, the temperature of the reaction kettle was raised to 110°C, and after constant temperature reaction for 20 hours, it was cooled to room temperature to obtain a white precipitate, which was aged for 10 hours and then sampled; finally, the precipitate was filtered and washed until no other ions existed. , and dried at 80°C for 5 hours to obtain zinc borate whisker powder.

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Abstract

The invention relates to a new hydrothermal synthesis method of zinc borate whisker. The method comprises the following steps: firstly, using borax to prepare 2.0-5.8wt% of solution; secondly, adding the solution in zinc salt solution, stirring evenly to obtain slurry; thirdly, placing the slurry in a reaction kettle, adjusting the inner filing degree of the reaction kettle, heating the reaction kettle to 110-160 DEG C, performing thermostatic reaction for 1-50 hours, cooling to the room temperature to obtain white precipitate; and finally, filtering the precipitate, washing, and drying to obtain zinc borate whisker powder. In the synthesis process, surfactant used as crystal form modifier is not added; and the anisotropy of crystals is utilized and the reaction conditions are controlled to prepare zinc borate whisker, the technology is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a new method for hydrothermal synthesis of zinc borate whiskers. Background technique [0002] Whisker is a fiber grown in the form of a single crystal under artificial control conditions. Its diameter is so small that it is difficult to accommodate the defects that often appear in large crystals. The atoms are highly ordered, so the strength is close to the theoretical value of a complete crystal. In engineering It has broad application prospects in the fields of plastics, coatings, heat insulation, and insulating materials. [0003] The development of whiskers provides important conditions for the enhancement of polymer materials, the development of new varieties and new materials, so whiskers, as one of the components of composite materials, are increasingly valued by people. Whisker-reinforced composites can not only greatly reduce the cost of materials, but also significa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B29/62C30B7/10C01B35/12C01G9/00
Inventor 刘鑫李武乃学瑛魏明边绍菊孟庆芬朱东海
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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