阅读说明：本技术 一种纳米硫酸钡粉体的制备方法 (Preparation method of nano barium sulfate powder ) 是由 李玉霞 任真 郭建平 冯瑜 于 2020-04-20 设计创作，主要内容包括：本发明公开了一种纳米硫酸钡粉体的制备方法,以硫化钡和硫酸钠为原料,进行纳米硫酸钡粉体的制备。制备过程中控制反应在中性体系进行,添加复合改性剂控制粒子表面性质,利用球磨搅拌的方式调控粒子的大小。该方法成本低、工艺简单、产品粒度分布集中、均匀,能达到对纳米硫酸钡粒子大小及性质的控制,适宜于产业化生产应用。(The invention discloses a preparation method of nano barium sulfate powder, which takes barium sulfide and sodium sulfate as raw materials to prepare the nano barium sulfate powder. In the preparation process, the reaction is controlled to be carried out in a neutral system, the surface property of the particles is controlled by adding the composite modifier, and the size of the particles is regulated and controlled by utilizing a ball milling stirring mode. The method has the advantages of low cost, simple process, concentrated and uniform product particle size distribution, can control the size and the property of the nano barium sulfate particles, and is suitable for industrial production and application.)

1. A preparation method of nano barium sulfate powder is characterized by comprising the following steps:

respectively preparing a barium sulfide solution and a sodium sulfate solution, and then adding a composite modifier into the sodium sulfate solution; then quickly adding an alkaline barium sulfide solution into a neutral sodium sulfate solution, reacting in a neutral system to form slurry, wherein the reaction temperature is 25-95 ℃, reacting for 1-8 hours in a ball milling stirring mode, and filtering, washing, separating, acid washing with dilute sulfuric acid and drying a product to obtain nano barium sulfate powder;

the composite modifier is any one of the following composites:

(1) the mass ratio of nonionic surfactant polyoxyethylene fatty acid ester to cationic surfactant imidazoline is 1: 2 of the complex of (a) and (b),

(2) the mass ratio of the polyoxyethylene fatty acid ester to the cationic didecyl dimethyl ammonium chloride DEQ is 1: 2 of the complex of (a) and (b),

(3) fatty acid polyoxyethylene ester and narrow distribution alcohol ether AEO₉Disodium sulfosuccinate is prepared from the following raw materials in a mass ratio of 1: 2.

2. The method for preparing nano barium sulfate powder according to claim 1, wherein: the mass concentration of the barium sulfide solution is 5-30%, the mass concentration of the sodium sulfate solution is 1-25%, and the molar ratio of barium sulfide to sodium sulfate is 1: 1-1: 1.3.

3. the method for preparing nano barium sulfate powder according to claim 1, wherein: the dosage of the composite modifier is 0.1-5% of the mass of barium sulfide.

4. The method for preparing nano barium sulfate powder according to claim 1, wherein: the stirring mode is a ball milling method, and the volume ratio of the zirconium beads to the slurry is 20-80: 100.

5. The method for preparing nano barium sulfate powder according to claim 1, wherein: in the drying process, the drying temperature is 110-150 ℃, and the drying time is 2 hours.

6. The method for preparing a nano barium sulfate powder according to any one of claims 1 to 5, characterized in that: the obtained nano particles have the particle size of 20 nm-100 nm and are uniformly dispersed.

Technical Field

The invention relates to a preparation method of nano barium sulfate powder.

Background

Barium sulfate is an important chemical raw material and is widely applied to the fields of coatings, printing ink, rubber, medicines, plastics, textiles, drilling and the like. Industrially prepared BaSO₄The product has large grain diameter, wider grain size distribution and poor dispersibility, and limits the further popularization and application of the product, thereby developing the nano BaSO with high purity, small grain diameter and good dispersibility₄Is always the main work of researchers at home and abroad.

At present, the preparation methods of nano barium sulfate powder are numerous, and direct precipitation is mainly adoptedThe method comprises an EDTA complex precipitation method, a microreactor method, a hypergravity method, a microemulsion method and the like, wherein the microreactor method and the hypergravity method have high product quality, but have high requirements on equipment and high energy consumption, and general enterprises cannot implement the production route. In the EDTA complexation method, the complexing agent has large dosage, and is not easy to clean in the application process, thereby influencing the application. Although the micro-emulsion method can obtain monodisperse barium sulfate particles, organic matters, surfactants and the like are added in the process to change a reaction system, so that the process is complex and the industrial production and application are not easy to realize. These methods have the disadvantages of complicated and lengthy process route and high equipment requirement. The direct precipitation method has simple process, easy control and low cost, but the nano barium sulfate produced by the direct reaction has uneven particle size distribution and low quality. Therefore, at present, the modifier is added in the process to control the performance of barium sulfate particles, and most BaSO₄The modification process is that firstly BaSO is added₄The prepared product is modified by using a modifier, so that the whole process is complicated and long, and the modification effect is not obvious.

Disclosure of Invention

The invention aims to provide a preparation method of nano barium sulfate powder, which has simple process and easy control, can greatly improve the granularity and quality of nano barium sulfate on the premise of not increasing the cost of enterprises, and is suitable for industrialized popularization and application.

In the invention, the preparation principle of the nano barium sulfate is as follows: BaS + Na₂SO₄= BaSO₄↓+Na₂And S, adding a composite modifier for modification in the preparation process, and adding the composite modifier into a sodium sulfate solution, so that the micelle is more favorably formed. The composite modifier forms stable micelle aggregate in a neutral solution system to form a microreactor, BaS and Na₂SO₄BaSO produced by carrying out metathesis reaction₄The precipitate is attached to the surface of the micelle and aggregated to form nano particles, and the particles with large particle size can be subjected to high-speed fluid dispersion and zirconium bead grinding in a ball milling and stirring mode to finally achieve the aim of nano BaSO₄Effectively controlling the grain diameter.

The invention provides a preparation method of nano barium sulfate powder, which comprises the following steps: respectively preparing a barium sulfide solution and a sodium sulfate solution, and then adding a composite modifier into the sodium sulfate solution; then quickly adding an alkaline barium sulfide solution into a neutral sodium sulfate solution, reacting in a neutral system to form slurry, reacting for 1-8 hours at the reaction temperature of 25-95 ℃ in a ball milling stirring mode, and filtering, washing, separating, washing with dilute sulfuric acid and drying the product to obtain nano barium sulfate powder;

the composite modifier is any one of the following composites:

(1) the mass ratio of nonionic surfactant polyoxyethylene fatty acid ester to cationic surfactant imidazoline is 1: 2 of the complex of (a) and (b),

(2) the mass ratio of the polyoxyethylene fatty acid ester to the cationic didecyl dimethyl ammonium chloride DEQ is 1: 2 of the complex of (a) and (b),

(3) fatty acid polyoxyethylene ester and narrow distribution alcohol ether AEO₉Disodium sulfosuccinate is prepared from the following raw materials in a mass ratio of 1: 2.

According to the invention, the composite modifier is added in the preparation process for modification, and various modifiers are combined for use to obtain respective advantages, so that the preparation and modification are completed simultaneously, the modification effect is ideal, and the modification process is simple; meanwhile, the process feeding sequence and method are changed, so that the reaction is quickly completed in a neutral system; the ball milling technology is added in the preparation process, so that the nucleation speed and the growth speed of the barium sulfate particles can be effectively controlled, and the size and the uniformity of the barium sulfate particles can be effectively controlled.

Further, the mass concentration of the barium sulfide solution is 5-30%, the mass concentration of the sodium sulfate solution is 1-25%, and the molar ratio of barium sulfide to sodium sulfate is 1: 1-1: 1.3.

further, the dosage of the composite modifier is 0.1-5% of the mass of barium sulfide.

Further, the stirring mode is a ball milling method, and the volume ratio of the zirconium beads to the slurry is 20-80: 100.

Further, in the drying process, the drying temperature is 110-150 ℃, and the drying time is 2 hours.

Furthermore, the particle size of the nano particles prepared by the preparation method is 20 nm-100 nm, and the nano particles are uniformly dispersed.

The invention has the beneficial effects that:

(1) compared with other prior art, the invention controls the reaction in a neutral system during the preparation process, adds the composite modifier to control the surface property of the particles, and regulates and controls the size of the particles by a ball milling and stirring mode;

(2) the method has the advantages of low cost, simple process, concentrated and uniform product particle size distribution, can control the size and properties of nano barium sulfate particles, and is suitable for industrial production and application;

(3) the prepared nano barium sulfate has high purity, small particle size and concentrated distribution, can be effectively applied to the application fields of coatings, new energy batteries, plastics, corrosion prevention and the like, can not only exert the performance of the material, but also exert the special performance of the nano material.

Drawings

FIG. 1 is a TEM image of nano barium sulfate obtained in example 4.

Detailed Description

The present invention is further illustrated by, but is not limited to, the following examples.