Barium sulfate and preparation method thereof

Abstract

The invention relates to barium sulfate and a preparation method thereof, and in particular relates to barium sulfate with low density and a hollow structure. The preparation method comprises the following steps: performing emulsification treatment on a barium source solution by using an emulsifying agent; coating an oil core material by using the barium source solution so as to form a liquid bead with an oil-in-water structure; enabling the atomized liquid bead to be subjected to vulcanization and oxidation by virtue of sulfur dioxide gas and oxygen respectively by using an atomizing nozzle,, namely, firstly dissolving the sulfur dioxide gas into the liquid bead to form sulfite, enabling sulfite to react with barium ions to generate barium sulfite, then rapidly oxidizing barium sulfite by using oxygen to generate barium sulfate, performing vulcanization and oxidation on the barium source solution on the outer layer of the liquid bead to coat the oil core material in the center to form barium sulfate particles, and finally drying to form the barium sulfate particles with the hollow structure. Hollow barium sulfate is low in density, excellent in structure stability and good in mechanical strength and processability; moreover, the particle diameter and hollow size of hollow barium sulfate can be subjected to micro-adjustment as required; barium sulfate is convenient and practical, and has wide application values.

Description

technical field [0001] The invention belongs to the field of chemical materials, relates to the field of inorganic non-metallic materials, and mainly relates to barium sulfate and a preparation method thereof. Background technique [0002] Barium sulfate is one of the most important inorganic chemical products nowadays. It is widely used in rubber, plastics, coatings, medicine and other industries, and is also used as a weighting agent for oil and natural gas drilling mud. Barium sulfate is added to rubber and plastic products as a filler, which not only plays the role of increasing capacity, increasing the amount, and reducing costs, but also improves the mechanical strength and thermodynamic properties of the products. But barium sulfate has a high density (4.5 g / cm 3 ) feature makes the density of products added with barium sulfate greatly increased, which weakens and reduces the advantages of light weight of plastic and rubber products, increases production costs, and ...

AI Technical Summary

Problems solved by technology

However, both natural and synthetic barium sulfate have the defect of high density, which is not conducive to the large-scale addition and use of barium sulfate in rubber and plastic products.

[0004] Chinese Patent Publication No. CN102167386A discloses a preparation method of modified nano-precipitated barium sulfate, the method uses modifying agent to modify the precipitated barium sulfate, and prepares The nano-modified precipitated barium sulfate has uniform particle size distribution, but because this method only carries out surface modification treatment to the precipitated barium sulfate, and does not reduce the density of barium sulfate, the barium sulfate prepared by this method has the defect of high density. It is also unfavorable for the large amount of barium sulfate to be added to rubber and plastic products.

The barium sulfate nanoparticle prepared by this method has low raw material cost, large production capacity, simple and convenient operation process, good repeatability and stability, but because the barium sulfate prepared by this method is a solid nanoparticle, there is also the defect of high density, so it is not suitable It is beneficial to add a large amount of barium sulfate in rubber and plastic products

[0006] Chinese Patent Publication No. CN103073042A discloses a preparation method of submicron barium sulfate, the method first configures soluble barium salt and soluble sulfate into a solution, two The solution mixing reaction prepares nano-barium sulfate, and then uses nano-barium sulfate as a seed crystal to prepare submicron barium sulfate products. The barium sulfate product prepared by this method has uniform appearance and controllable particle size, but due to the prepared submicron Barium sulfate is a solid particle, so the density is high, which is not conducive to the addition and use of barium sulfate in rubber and plastic products.

This method can not only effectively control the morphology of barium sulfate nanoparticles, but also fully enhance the interaction between barium sulfate nanoparticles and polymer matrix, but because only the surface morphology of barium sulfate particles is controlled, the density of barium sulfate There is no reduction, and there is also the disadvantage of high density, so it is not conducive to the large amount of barium sulfate in rubber and plastic products.

[0008]According to the above, the barium sulfate prepared by different methods all has the defect of high density, which limits the large-scale addition and use of barium sulfate in rubber and plastic filling

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