Zinc borate 2335 preparation method and zinc borate 2335 particle diameter control method

A zinc borate, particle size technology, applied in borates, chemical instruments and methods, boron compounds, etc., can solve the problems of uneven product size distribution, irregular shape, single reaction conditions, etc., to avoid surface crystallization Effect of Incomplete or Severe Agglomeration Phenomenon

Inactive Publication Date: 2018-12-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve key problems such as single reaction conditions in the traditional zinc borate preparation process, lack of technical means for product particle size regulation, uneven product size distribution, irregular appearance, poor application performance, etc., the present invention uses zinc sulfate, borax, oxidized Zinc, water, boric acid, and sodium sulfate are used as raw materials to prepare 2335-type zinc borate. Through the following technological innovations, the selective control of zinc borate particle size from 0.5um to 10um is achieved, and the product has uniform particle size distribution and regular shape.

Method used

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  • Zinc borate 2335 preparation method and zinc borate 2335 particle diameter control method
  • Zinc borate 2335 preparation method and zinc borate 2335 particle diameter control method
  • Zinc borate 2335 preparation method and zinc borate 2335 particle diameter control method

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Embodiment 1

[0037] Prepare 45g of zinc sulfate into a solution with a content of 35%, add it into the reaction kettle, start stirring, mix 67g of borax, 0.3g of zinc oxide, 15g of boric acid, 15g of sodium sulfate, 0.03g of 0.5-3μm Zinc borate crystal seeds are added to the reactor, and a certain amount of water is added to make the system solid-liquid ratio 1:1. The temperature is raised to 97°C for reaction, and the reaction is kept for 5 hours. After the reaction, it takes 75 minutes to add 75 parts of 82°C water to the reactor. , reduce the motor speed, and the system will naturally cool down to 60°C. The reaction solution is centrifuged, washed, and the filter cake is air-dried to obtain the product of the present invention.

Embodiment 2

[0039] Prepare 40g of zinc sulfate into a solution with a content of 35%, add it into the reaction kettle, start stirring, mix 70g of borax, 0.5g of zinc oxide, 2g of boric acid, 2g of sodium sulfate, 0.03g of 6-10μm Zinc borate crystal seeds are added to the reactor, and a certain amount of water is added to make the system solid-liquid ratio 1:1, and the temperature is raised to 97°C for reaction, and the reaction is kept for 5 hours. After the reaction, it takes 120 minutes to add 100 parts of 95°C water to the reactor , reduce the motor speed, and the system will naturally cool down to 60°C. The reaction solution is centrifuged, washed, and the filter cake is air-dried to obtain the product of the present invention.

Embodiment 3

[0041]Prepare 50g of zinc sulfate into a solution with a content of 35%, add it into the reaction kettle, start stirring, mix 60g of borax, 0.1g of zinc oxide, 7g of boric acid, 7g of sodium sulfate, 0.03 parts of 3-6μm Zinc borate crystal seeds were added to the reactor, and a certain amount of water was added to make the system solid-to-liquid ratio 1:1. The temperature was raised to 105°C for reaction, and the reaction was kept for 5 hours. After the reaction, it took 30 minutes to add 50g of 70°C water to the reactor. Reduce the motor speed, and the system naturally cools down to 60°C. The reaction solution is centrifuged, washed, and the filter cake is air-dried to obtain the product of the present invention.

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Abstract

The invention discloses a zinc borate 2335 preparation method, and a zinc borate 2335 particle diameter control method. Zinc borate 2335 is prepared from the following raw materials: zinc sulfate, sodium borate, zinc oxide, water, boric acid and sodium sulfate. Concentrations of the boric acid and the sodium sulfate in a system are adjusted, and product particle diameter control is carried out during a cooling stage of the reaction system through slow addition of water at a temperature of 70-95 DEG C and stirring speed adjustments, so that the diameters of zinc borate particles can be selectively controlled between 0.5 mum and 10 mum. Therefore, Uniform particle diameter distributions and standard shapes of products are achieved, and various application demands of the market can be fully satisfied.

Description

technical field [0001] The invention relates to the field of halogen-free flame retardants, in particular to a method for preparing zinc borate and a method for controlling particle size. technical background [0002] Zinc borate is one of the earliest inorganic flame retardants. It is a multi-functional additive with various functions such as flame retardancy, char formation, smoke suppression, smoldering suppression, and prevention of molten droplets. It is also low-toxic, cheap, and High transparency and not easy to precipitate and other characteristics. Because zinc borate 2ZnO·3B 2 o 3 3.5H 2 O has a high dehydration temperature and still retains crystal water above 250 °C, so it has high commercial value. However, there are a large number of defects in the traditional industrial preparation process of zinc borate, which limits the application and promotion of its products. [0003] Since inorganic flame retardant materials are mostly used as additives in engineeri...

Claims

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Application Information

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IPC IPC(8): C01B35/12
CPCC01B35/127C01P2004/03C01P2004/32C01P2004/20C01P2004/38C01P2004/61C01P2004/62
Inventor 岳涛邢文国冯维春高维丹翟云鸽王瑞菲
Owner QINGDAO UNIV OF SCI & TECH
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