What are the characteristics of the preparation process of ultrafine aluminum hydroxide?
With the development of our industry and the needs of society, many modern products are becoming more and more refined. Some chemical products are also required to be produced in this way. For aluminum hydroxide,
With the development of our industry and the needs of society, many modern products are becoming more and more refined. Some chemical products are also required to be produced in this way.aluminum hydroxideSaid, ultra-fine products are also slowly by our attention, this small series for everyone to talk about its production.
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. The invention can use the central commodity NaAlO2 solution and CO2 waste gas, and use the spiral channel type rotating bed RBHC for carbonization reaction as the primary technology to prepare nano-scale ultrafine aluminum hydroxide, and solve the traditional mixing tank method for low CO2 gas absorption rate, long carbonization time, low commodity purity, uneven particle size and rotating packed bed RPB carbonization reaction easy to block technical problems. The nano-scale ultrafine fibrous and granular aluminum hydroxide with different crystal forms were prepared. The invention prepares about 10nm granular aluminum hydroxide can be used as an outstanding inorganic flame retardant, and the prepared particle size of about 5nm, 200-300nm long nanofibrous pseudo-boehmite can be widely used in the catalytic category.
It is characterized:
(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 containing 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-mentioned 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.
No matter what kind of aluminum hydroxide products, whether superfine or other, the prerequisite for our use is to be determined according to our actual situation. Only in this way can our production and use not deviate from the actual situation.
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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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Ministry of Foreign Trade Telephone:13956052398
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