Method for preparing micrometer/nanometer calcium carbonate in situ and shear thickening fluid of micrometer/nanometer calcium carbonate

A nano-calcium carbonate, in-situ preparation technology, applied in the preparation of carbonate/acid carbonate, textile and papermaking, fiber processing and other directions, can solve the problems of difficult crystal control, complicated operation, poor micro mixing, etc. Achieve the effect of easy industrial production, simple preparation process and good dispersibility

Inactive Publication Date: 2014-03-05
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the uneven distribution of the gas phase, the interface contact area between the gas, liquid and solid phases is small, the mass transfer rate is slow, the microscopic mixing is poor, the production efficiency is low, and the crystal form is not easy to control, which affects large-scale production.
Not only these existing technologies for preparing nano-calcium carbonate have many defects such as complex operation and poor morphology of the prepared nano-calcium carbonate, but also lead to poor dispersion performance in the dispersion medium for preparing shear thickening fluid, and the effect is not ideal. Therefore, the present invention tries a kind of brand-new in-situ preparation micro / nanometer calcium carbonate and the method for shear thickening fluid thereof

Method used

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  • Method for preparing micrometer/nanometer calcium carbonate in situ and shear thickening fluid of micrometer/nanometer calcium carbonate
  • Method for preparing micrometer/nanometer calcium carbonate in situ and shear thickening fluid of micrometer/nanometer calcium carbonate
  • Method for preparing micrometer/nanometer calcium carbonate in situ and shear thickening fluid of micrometer/nanometer calcium carbonate

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Experimental program
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Effect test

Embodiment 1

[0029] Add 176.18g (1.0mol) of calcium acetate monohydrate into 100mL of glacial acetic acid, stir and dissolve fully to obtain a calcium acetate solution. 200g of PEG400 was heated to 200°C. Then calcium acetate solution was quickly added to PEG400, vigorously stirred, and the temperature was kept at 200°C for 3h. Completely decompose calcium acetate and completely volatilize the acetic acid solvent and by-product acetone, cool to room temperature, and prepare CaCO 3 Shear thickening liquid dispersed in PEG400. figure 1 It is the XRD pattern of the prepared calcium carbonate, which illustrates the successful preparation of calcium carbonate, and what is obtained is calcite-type calcium carbonate; figure 2 It is the TEM picture of the prepared calcium carbonate, it can be seen that the dispersion of the particles is very good, the agglomeration between the particles is less, the particle size is about 150nm, and the particle size distribution is narrow; image 3 is the dyn...

Embodiment 2

[0031] According to the synthesis method and conditions of Example 1, PEG400 is replaced by ethylene glycol, polyethylene glycol 200, polyethylene glycol 600, and hydroxyl silicone oil respectively, and calcium carbonate dispersed in ethylene glycol, polyethylene glycol 200 can be obtained respectively. , polyethylene glycol 600, hydroxy silicone oil shear thickening liquid.

Embodiment 3

[0033] According to the synthesis method and conditions of Example 1, the solvent acetic acid is replaced by ethanol, water, or no solvent is added, and CaCO can also be obtained. 3 Shear thickening liquid dispersed in PEG400.

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Abstract

The invention provides a method for preparing micrometer/nanometer calcium carbonate in situ and a shear thickening fluid of the micrometer/nanometer calcium carbonate. The shear thickening fluid comprises a dispersion medium and a dispersion phase, wherein the dispersion medium is formed by mixing one or more of glycol, polyethylene glycol, propylene glycol and hydroxyl silicone oil; the dispersion phase comprises the micrometer/nanometer calcium carbonate generated from calcium acetate in the dispersion medium in situ. The shear thickening fluid provided by the invention is conveniently and fast prepared by synthesizing the dispersion phase in situ in the dispersion medium. Compared with the prior art, the shear thickening fluid provided by the invention has better dispersity, stability and shear thickening property. The preparation process of the shear thickening fluid of the micrometer/nanometer calcium carbonate is simple, convenient to operate and easily realizes the industrial production.

Description

technical field [0001] The invention relates to a method for in-situ preparation of micro / nano calcium carbonate and a shear thickening fluid thereof, belonging to the technical field of preparation of energy-absorbing materials. Background technique [0002] In modern warfare and police duty, how to improve the operational flexibility of combatants while effectively reducing casualties is a major topic of long-term research. The use of body armor is one of the most effective ways to reduce casualties in combat and police emergencies. Traditional body armor is made of aromatic polyamide or ultra-high molecular weight polyethylene and ceramic inserts, which are hard and bulky. On the one hand, it greatly limits the flexibility of combatants and the mobility of combat units; on the other hand, it also It can only protect key fatal parts such as the chest and brain, and the rest of the limbs, joints, neck and other non-fatal parts are generally not protected. In 2003, the U.S....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/76D06M15/53D06M13/148D06M15/643C01B31/24C01B32/60
Inventor 周忠诚阮建明伍秋美杨海林
Owner CENT SOUTH UNIV
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