A kind of preparation method of magnesium borate whisker

Abstract

The invention discloses a preparation method of magnesium borate crystal whisker. The preparation method of the magnesium borate crystal whisker comprises the following steps: mixing and reacting magnesium chloride, boronic acid and sodium bicarbonate in a mass ratio of 1 to 2: 1 to 2.5: 1 to 5, and obtaining precursor mixtures; squeezing alveolate lamella on the precursor mixtures; conducting high temperature sintering on the lamellate precursor mixtures and obtaining magnesium borate crystal whisker sinter; washing and drying the magnesium borate crystal whisker sinter to obtain the magnesium borate crystal whisker. The preparation method of the magnesium borate crystal whisker generates no harmful gas and corrosion to production device, and causes no environment pollution; causes no water treatment problem for no water is added to materials; reduces working procedure, lowers cost; besides, generates little heat in reaction process, brings convenience for staffs to operate, improves working efficiency, and obtains high field of the magnesium borate crystal whisker; technology is simple, raw materials is few, generated sodium chloride (NaC1) after reaction can be directly used as cosolvent, no extra cosolvent is needed to add, and cost is slow.

Description

technical field [0001] The invention relates to a preparation method of magnesium borate whiskers. Background technique [0002] At present, the synthesis process of magnesium borate whiskers mainly adopts the melting method, that is, the raw material boric acid, magnesium chloride, co-solvent sodium chloride, potassium chloride, etc. are mixed with water in a certain proportion, and the powder is obtained by spray drying, and then melted at high temperature. Prepared by washing and drying. The disadvantages of this method are: a large amount of water and HCl gas will be released in the high-temperature melting reaction, which is highly corrosive to the high-temperature heating furnace, easily causes environmental pollution, and is difficult to implement on a large scale in industry; the spray drying process is complicated and consumes high energy. In the method, the raw materials are mixed with the co-solvent, although the mixture is uniform, but the amount of water added ...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: a large amount of water and HCl gas will be released in the high-temperature melting reaction, which is highly corrosive to the high-temperature heating furnace, easily causes environmental pollution, and is difficult to implement on a large scale in industry; the spray drying process is complicated and consumes high energy. In the method, the raw materials are mixed with the co-solvent, although the mixture is uniform, but the amount of water added is large, and the added water needs to be heated to evaporate, which consumes a lot of energy, and the equipment is expensive and complicated, and the process conditions are relatively harsh; the length of the product whisker is longer Short, long diameter is small, the length of the magnesium borate whiskers prepared by this method is generally 20-30μm, and the length-diameter ratio is 20-40

Although no HCl gas is discharged by adopting this method, the reaction time for generating magnesium borate compound in this method is longer and the energy consumption is large

At the same time, the precursor is precipitated and needs to be filtered, then mixed with a co-solvent, and then mixed with an organic solvent to form a mixed starting material. This method still needs to add a co-solvent to make more raw materials, complicated procedures, and high cost.

Moreover, it adopts organic solvent impregnation and mixing to mix the reaction starting materials evenly. Since the organic solvent needs to be additionally prepared and supplied quantitatively, the production efficiency is low, and it is not suitable for large-scale production.

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