Preparation method of monodisperse oil-phase nano barium sulfate dispersion

A nano barium sulfate and dispersion technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of small agglomeration, insufficient dispersibility, not monodisperse state, etc., and achieve mild process conditions and low price. , the effect of short response time

Active Publication Date: 2021-02-02
BEIJING UNIV OF CHEM TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still has the following defects: the particle size of the barium sulfate dispersion is generally greater than 30nm; the storage time is about 3 months without precipitation; the dispersion is not strong enough, and there is a small agglomeration phenomenon between the nanoparticles, which is not a monodisperse state

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preparation example Construction

[0043] As an aspect of the present invention, a kind of preparation method of monodisperse oil phase nano barium sulfate dispersion of the present invention, comprises the steps:

[0044] S1. Dissolving modifier A and barium compound in solvent A simultaneously to obtain solution A;

[0045] S2, dissolving the sulfate ion-containing compound in solvent B to obtain solution B;

[0046] S3. Inject solution A and solution B into the high-gravity rotating packed bed through the feed port at the same time, so that the two liquids are fully mixed in the rotating bed to obtain nano-barium sulfate slurry through the discharge port, and then the nano-barium sulfate slurry The material is transferred to the reaction vessel and heated to the modification temperature to carry out the modification reaction; after the modification is completed, the slurry is centrifugally washed, and the obtained filter cake is dispersed in water to obtain a water-phase nano barium sulfate dispersion;

[0...

Embodiment 1

[0064] A kind of preparation method of monodisperse oil phase nano barium sulfate dispersion, comprises the steps:

[0065] 1) Add 20% mass modifier stearic acid of theoretically obtained barium sulfate product to 0.05mol / L barium chloride methanol solution and stir to dissolve. Simultaneously, the concentrated sulfuric acid methanol solution of preparation 0.05mol / L concentration;

[0066] 2) Turn on the supergravity rotating packed bed and adjust the speed to 1500rpm; keep the temperature environment of the supergravity rotating packed bed at 50°C by heating in a circulating water bath; turn on the feed pump to control the feed rate of the barium chloride methanol solution containing stearic acid The feeding rate of concentrated sulfuric acid methanol solution is 100mL / min, and the feed rate of concentrated sulfuric acid methanol solution is 100mL / min; the barium chloride methanol solution containing stearic acid and the concentrated sulfuric acid methanol solution are simul...

Embodiment 2

[0076] A kind of preparation method of monodisperse oil phase nano barium sulfate dispersion, comprises the steps:

[0077] 1) Add 30% mass modifier lauric acid of the theoretically obtained barium sulfate product into an aqueous barium chloride solution with a concentration of 0.06mol / L and stir for dissolution. Simultaneously, the concentrated sulfuric acid aqueous solution of preparation 0.06mol / L concentration;

[0078] 2) Turn on the supergravity rotating packed bed and adjust the rotating speed to 2500rpm; keep the temperature environment of the supergravity rotating packed bed at 60°C by heating in a circulating water bath; turn on the feed pump and control the feed rate of the barium chloride aqueous solution containing stearic acid to 100mL / min, the feeding rate of concentrated sulfuric acid aqueous solution is 100mL / min; the barium chloride aqueous solution containing stearic acid and the concentrated sulfuric acid aqueous solution are simultaneously transported to t...

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Abstract

The invention discloses a preparation method of a monodisperse oil-phase nano barium sulfate dispersion, which is characterized by comprising the following steps of: simultaneously dissolving a modifier A and a barium compound in a solvent A to obtain a solution A; dissolving a compound containing sulfate ions in a solvent B to obtain a solution B; simultaneously injecting the solution A and the solution B into a super-gravity rotating packed bed through a feeding hole to obtain nano barium sulfate slurry, and then carrying out modification reaction; centrifugally washing the slurry after themodification is finished, and dispersing the obtained filter cake in water to obtain a water-phase nano barium sulfate dispersion; and adding a modifier B into the water-phase nano barium sulfate dispersion prepared in the step S3 for modifying, centrifugally washing the water-phase nano barium sulfate dispersion after modifying, and dispersing the water-phase nano barium sulfate dispersion in anoily medium to obtain the monodisperse oil-phase nano barium sulfate dispersion. The particle size of the monodisperse nano barium sulfate dispersion prepared by the method is about 15 nanometers, theparticle size distribution is uniform, no precipitate exists after the monodisperse nano barium sulfate dispersion is stored for more than or equal to 12 months, and the monodisperse nano barium sulfate dispersion is displayed in a monodisperse state through a transmission electron micrograph and is extremely good in dispersity.

Description

technical field [0001] The invention relates to the technical field of nanomaterials; more specifically, it relates to a preparation method of a monodisperse oil phase nano barium sulfate dispersion. Background technique [0002] Barium Sulfate (BaSO 4 ) is an important inorganic chemical, mainly used in filling materials and additives such as plastics, paints, cosmetics, ceramics, pigments and paper. In particular, nano-scale barium sulfate particles can be well used in advanced resins and rubbers. At present, the production of barium sulfate in my country mainly adopts the traditional Glauber's salt-black ash method. This process is not easy to control the growth of barium sulfate crystal form, and the particle size of the product is large and uneven. Such barium sulfate has strong shielding power. The transparency of printing into plates, films, containers, industrial products, decorations, etc. in resins is not good. When used in coatings and printing inks, it is diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46B82Y30/00B82Y40/00
CPCC01F11/462B82Y30/00B82Y40/00C01P2002/72C01P2004/04C01P2004/01C01P2004/64
Inventor 王洁欣方乐曹靖曾晓飞陈建峰
Owner BEIJING UNIV OF CHEM TECH
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