Detailed Explanation of Preparation Method of Ultrafine Aluminum Hydroxide
A superfine aluminum hydroxide preparation method, the sodium aluminate NaAlO2 solution and carbon dioxide containing gas touch, under the condition of high gravity carbonization reaction preparation of aluminum hydroxide gel, and then get different crystal type of ultrafine aluminum hydroxide, mainly by carbonization, filtration, washing, drying process.
a superfinealuminum hydroxidePreparation method, the sodium aluminate NaAlO2 solution and containing carbon dioxide gas touch, under the condition of high gravity carbonation reaction of preparation of aluminum hydroxide gel, and then get different crystal type of ultrafine aluminum hydroxide, mainly by carbonation, filtration, washing, boring process.
This preparation method can use the central commodity NaAlO2 solution and CO2 waste gas, using the spiral channel type rotating bed RBHC for carbonization reaction as the primary technology to prepare nano-scale ultrafine aluminum hydroxide, to solve the traditional mixing tank method of CO2 gas absorption rate is low, carbonization time is long, commodity purity is low, particle size is not uniform and rotating packed bed RPB carbonization reaction is easy to block and other technical problems. The nano-scale ultrafine fibrous and granular aluminum hydroxide with different crystal forms were prepared. The granular aluminum hydroxide of about 10nm prepared by the invention can be used as an outstanding inorganic flame retardant, and the prepared nanofibrous pseudo-boehmite with a particle size of about 5nm and a length of 200-300nm can be widely used in the catalytic field.
1. A preparation method of ultrafine aluminum hydroxide, touching sodium aluminate NaAlO2 solution and carbon dioxide-containing gas, preparing pseudo-boehmite gel by carbonization reaction method under high gravity conditions, and then obtaining ultrafine aluminum hydroxide with different crystal forms, which is mainly composed of carbonization, filtration, washing and drying processes, and is characterized in that:
1) the concentration of sodium aluminate NaAlO2 solution was controlled to 0.05 ~ 2mol/L;
2) in sodium aluminate NaAlO2 solution to participate in the mass content of 1 ~ 2% organic polymer dispersant;
3) Put the above mixture into the reactor, start up the reactor, after the liquid flow in the reactor is stable, introduce CO2 gas with concentration into the reactor, control the reactor speed to 200~3000rpm, the gas-liquid ratio to 0.5~20, control the carbonation reaction temperature to 0~100 ℃, record the temperature and pH value on time, and stop introducing CO2 gas when the pH value reaches 9~12, the speed of the reactor is decreased and recirculated for a period of time to obtain the precursor of aluminum hydroxide;
4) Continue to further dispose of the above commodities with different crystal forms, such as whether it is a process of demand aging; The above-mentioned reactor is a rotating bed super-gravity reactor, which mainly includes a rotor, a spreader arranged in the center of the rotor, a liquid inlet, an air inlet, a waste gas outlet and a material outlet.
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Zhongke Flame Retardant Organization Watches 20 Closing Ceremonies
On the morning of October 22, 2022, members of Zhongke Flame Retardant New Materials Co., Ltd. watched the closing ceremony of the 20th Congress under the leadership of General Manager Wang Ligui.
Everyone knows that there are two common flame retardants. Today we are going to talk about only one of them. Aluminum hydroxide flame retardant is an environmentally friendly halogen-free flame retardant, which can be widely used in fabrics, wood, plastics, and rubber., Polyurethane and other industries have ideal flame retardant effect. In the process of industrial application, it is found that flame retardant failure occurs when aluminum hydroxide flame retardant is added. The following are the reasons for the failure of aluminum hydroxide flame retardant, how to prevent it, how to deal with the operation, and restore the original function.
As a flame retardant, magnesium hydroxide also need to improve what aspects?
When it comes to flame retardants, everyone is familiar with them. Although we usually have less contact with them, we can know what they are used for from the name. Have to talk about magnesium hydroxide, we all know that its main presentation state is a granular, at present, the market sales of magnesium hydroxide particle size is larger, part of the commodity particle size up to tens of microns, immediately used as a flame retardant, poor dispersion, the physical properties of raw materials greater harm. In industrial production, physical grinding methods are generally used to reduce the particle size to 1 micron. The surface of magnesium hydroxide has high polarity and is easy to agglomerate. As the compatibility of refractory materials and polymer substrates, it not only reduces its flame retardant grade, but also causes more serious harm to the physical properties of raw materials.
Hefei Zhongke Flame Retardant New Material Co., Ltd
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