Magnesium hydroxide powder coating machine, dryer, powder disperser

Release time:

2024-10-08 09:25

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As an important inorganic flame retardant, magnesium hydroxide has the advantages of high decomposition temperature, low smoke and non-toxicity, but its application in polymer materials is limited. The main reason isHydrogen and oxygenmagnesium sulfate surfaceCanHigh, polar, prone to agglomeration, and with the polymer phase.Capacitypoor, resulting in the mechanical properties and flame retardant properties of composite materials is difficult to achieve the desired effect. Therefore, magnesium hydroxide is modified and coated to improve its surface properties and improve its dispersion and compatibility in polymer materials..

Chemical coating modification is the most used method for surface modification of magnesium hydroxide. The principle is that one or more layers of organic or inorganic compound films are formed on the surface of magnesium hydroxide through chemical reactions, thereby changing its surface properties. According to the different modifiers, chemical coating modification can be divided into the following:

surfactant modification:Since the surface of magnesium hydroxide has a higher positive charge, anionic surfactants are generally used for modification. Commonly used modifiers include stearic acid, sodium stearate, zinc stearate, sodium oleate, sodium dodecyl sulfonate, and the like. These surfactants adsorb on the surface of magnesium oxide, reduce the surface energy of the base, and improve its dispersibility in polymer materials.

coupling agent modification:Coupling agent treatment is the most commonly used method for surface modification of magnesium hydroxide. Among them, the silane coupling agent has become the preferred modified magnesium hydroxide because of its unique molecular structure and chemical properties. One end of the silane coupling agent can react with the hydroxyl group on the surface of magnesium hydroxide to form a stable chemical bond:The other end can react with the functional groups in the polymer material, thereby enhancing the compatibility of magnesium hydroxide with the polymer material. Modifier compound:The compounding of different types of modifiers can give full play to their respective advantages, form complementarity and improve the modification effect. For example, the use of silane coupling agent and stearic acid can form a more stable coating on the surface of magnesium oxide, further improving its dispersion and compatibility in polymer materials..

Industrial production of commonly used modified equipment"Hive mill",The honeycomb mill modification process is an efficient process system that requires very precise feeding and stable control technology. According to the different characteristics of the materials, the materials are accurately quantified and weighed, and enter the hot air system through the frequency conversion speed regulation device. After the free water on the surface of the materials is removed by the hot air, they are fully dispersed, depolymerized and reduced to the original particles or natural crystal particle size in the honeycomb mill. The fully depolymerized reduced particles boil in air in conjunction with the atomized modifier entanglement to form a monolayer nanocladding film. After the processing is completed, the finished product leaves the mill through an air stream and is transported to a blowback bag filter. In order to complete the magnesium oxide modification process. Covering rate up99.2%, the activation rate was 99.8%. The magnesium oxide modified by honeycomb mill can be used in composite materials to enhance the adhesive strength between the material and the matrix and improve the performance of the material.

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