Hydrothermal method for preparation of shape-controllable low-hydrate zinc borate powder

Abstract

The invention discloses a new method for hydrothermally preparing zinc borate powder with different shape and low water containing, belonging to the technological process field of preparing inorganic material. The invention employs zinc bloom and boracic acid as raw material, deionized water as dissolvent, pressure pan as reactor, the filling degree in the pan is between 65-85%, reacting temperature being 110-160 Deg C, reaction time is 6-24 hours, synthesizing the zinc borate powder of granular, acicular and stick shape and low water containing by controlling adding surface activator or the aging time after reaction, the chemical composition is 2ZnO*3B2O3*3H2O. The invention is characterized by the simple process, temperate reacting condition and easiness to control the product shape, and possesses a wide usage prospect in combustion inhibitor and anti-smoking agent.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and relates to a method for preparing low-water zinc borate powder, in particular to a process method for preparing low-water zinc borate powder with controllable morphology by using a hydrothermal method. Background technique [0002] Zinc borate is a new type of inorganic flame retardant, the most widely used is 2335 low-water zinc borate, and its molecular formula should be changed to 2ZnO·3B 2 o 3 ·3H 2 O. Low-water zinc borate is widely used in rubber parts of high-rise buildings, elevator cables, cable plastic sheaths, electrical plastics, carpets, TV casings and Parts, marine coatings and fabrics. Ultra-fine, well-dispersed low-water zinc borate powder has the characteristics of high energy, ultra-fine, high activity, etc., which can enhance the interaction between it and the polymer interface, so that the low-water zinc borate can be more uniform Dispersed in the polymer to improve...

AI Technical Summary

Problems solved by technology

The preparation method is generally to prepare large particles of low-water zinc borate first, and then grind it or obtain the product through other physical methods. This method is seriously agglomerated due to ball milling, and it is easy to introduce new impurities. The process is complicated and cannot be obtained. Directly obtain superfine products through chemical reaction

[0004] Chinese patent CN 1167730A discloses a technology for preparing ultra-fine low-water zinc borate by introducing non-ionic surfactants such as fatty alcohol polyoxyethylene ether to control the particle size. The particle size of the prepared product is in the range of 0.1-10 μm , but this method needs to add surfactant to obtain superfine products, and the price of this surfactant is too high

However, the method is complex and needs to be carried out step by step, and the reaction temperature of each step is different, so it is difficult to control

[0006] "Materials science and technology" (Materials science & technology) 2004, volume 12, number 5, page 529, reported the synthesis of low-water zinc borate with a particle size of 1.0-6.0 μm. This method requires microwave heating, which is harsh and not easy to Industrial production

[0007] The particle size of zinc borate prepared by the existing method is still relatively large, and its compatibility with polymers is poor, and other low-water boric acid with special morphology has not been reported in the literature, which cannot meet the requirements of technological development.

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