Method for preparing submicron basic magnesium sulfate whisker with magnesite and prepared products

Abstract

The invention relates to a method for preparing submicron basic magnesium sulfate whisker with magnesite and prepared products. The method is characterized by comprising steps of preparing magnesium oxide (obtained through calcining magnesite) into active magnesium oxide powder, then adding distilled water to prepare a magnesium oxide initial slurry with initial concentration of 0.25-1.25mol / kg, adding 1.0mol / dm<3> sulfuric acid aqueous solution and an additive-polyacrylamide to the initial slurry so as to obtain a base material, putting the base material into a high pressure reactor, heating up while stirring, preserving heat for 1.0-5.0 hours at constant temperature and constant pressure when the temperature in the reactor reaches 150-200DEG C, then stopping heating and stirring, air cooling to room temperature, and carrying out conventional treatment on the product to obtain the submicron basic magnesium sulfate whisker, wherein the draw ratio of the whisker is greater than 100, the average diameter is 100-300nm, and the content of single whisker is over 90%.

Description

[0001] technical field [0002] The invention belongs to the technical field of preparation of inorganic non-metallic powder materials, and specifically relates to a method and a product for preparing submicron basic magnesium sulfate whiskers from magnesite. Background technique [0003] In recent years, magnesium chemical materials have attracted much attention in the fields of automobiles, papermaking, and aerospace. Among them, basic magnesium sulfate whiskers have multiple effects such as flame retardancy, smoke suppression, and increased strength when added to organic polymer materials such as PVC and ABS. It is an inorganic functional material with high added value and high economic benefits. [0004] At present, there are many reports on the preparation and application of basic magnesium sulfate whiskers, but the phenomenon of large whisker diameter, uneven distribution of morphology, high surface energy, and insufficient thermodynamic stability are common. Therefore...

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Problems solved by technology

[0004] At present, there are many reports on the preparation and application of basic magnesium sulfate whiskers, but the phenomenon of large whisker diameter, uneven distribution of morphology, high surface energy, and insufficient thermodynamic stability are common. Therefore, in the preparation and processing Agglomeration is very easy to occur during the process; at the same time, basic magnesium sulfate whiskers have strong hydrophilicity, resulting in poor compatibility with the matrix when compounded with polymers or other materials, which affects the mechanical properties of the compounded materials