Preparation method of nano calcium carbonate capable of stably suspending and dispersing in aqueous solution

A technology of nano-calcium carbonate and aqueous solution, applied in the direction of calcium carbonate/strontium/barium, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as reducing the surface energy of nano-calcium carbonate grains, and achieve expanded use range effect

Active Publication Date: 2019-06-14
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no use of overcarbonation to form uniform bicarbonate on the surface of nano-grains, and then add hydrophilic modification additives to reduce t...

Method used

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  • Preparation method of nano calcium carbonate capable of stably suspending and dispersing in aqueous solution
  • Preparation method of nano calcium carbonate capable of stably suspending and dispersing in aqueous solution
  • Preparation method of nano calcium carbonate capable of stably suspending and dispersing in aqueous solution

Examples

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Embodiment 1

[0039] A kind of preparation method of the nano-calcium carbonate of stable suspension dispersion in aqueous solution, comprises the steps: add mass concentration in carbonization tower and be 8%, the calcium hydroxide suspension that temperature is 25 ℃, pass into carbon dioxide gas (CO 2content is 30%) to reaction slurry pH=6.5 to obtain nano-calcium carbonate slurry, and then carry out 5min overcarbonization to obtain nano-calcium carbonate cooked slurry; place nano-calcium carbonate cooked slurry in a sealed container, add calcium carbonate dry basis 1.0% ethanol, stirring and modifying for 1 hour, the modification temperature is 120° C. to obtain a modified nano-calcium carbonate slurry, which is dehydrated by pressure filtration, dried, and pulverized to obtain a nano-calcium carbonate product.

[0040] From figure 1 It can be seen that the nano-calcium carbonate prepared in Example 1 is a monodisperse cube, which is conducive to dispersion and suspension in aqueous solu...

Embodiment 2

[0042] A preparation method of nano-calcium carbonate stably suspended and dispersed in an aqueous solution, comprising the steps of: configuring a calcium hydroxide suspension with a mass concentration of 9% and a temperature of 15° C., adding it to a carbonization tower, and then feeding carbon dioxide gas (CO 2 content is 30%) to reaction slurry pH=7.0 to obtain nano-calcium carbonate slurry, and then carry out 10min overcarbonization to obtain nano-calcium carbonate cooked slurry; place nano-calcium carbonate cooked slurry in a sealed container, add ethanol and ethylene glycol , the addition of ethanol and ethylene glycol is 0.5% of the dry mass of calcium carbonate, stirring and modifying for 2 hours, and the modification temperature is 100°C to obtain a modified nano-calcium carbonate slurry, which is then centrifuged and dehydrated and dried , crushed to obtain nano calcium carbonate products.

[0043] From figure 2 It can be seen that the nano-calcium carbonate parti...

Embodiment 3

[0045] A kind of preparation method of the nano-calcium carbonate of stably suspending and dispersing in aqueous solution, comprises the following steps: the calcium hydroxide suspension liquid that configuration mass concentration is 10%, temperature is 20 ℃, adds in the carbonization tower, passes into carbon dioxide gas (CO 2 content is 30%) to the reaction slurry pH=6.0 to obtain nano-calcium carbonate slurry, and then carry out 8min overcarbonization to obtain nano-calcium carbonate cooked slurry; place nano-calcium carbonate cooked slurry in a sealed container, add ethylene glycol methyl acetate Ether and crotyl alcohol, the addition of the acetic acid ethylene glycol methyl ether is 0.6% of the dry basis of calcium carbonate, the addition of the crotyl alcohol is 0.8% of the dry basis of calcium carbonate, stirring and modifying for 4h, modifying The temperature is 90°C to obtain the modified nano-calcium carbonate slurry, which is then dehydrated by centrifugation, drie...

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Abstract

The invention discloses a preparation method of nano calcium carbonate capable of stably suspending and dispersing in an aqueous solution. The preparation method uses a carbonization method to preparethe nano calcium carbonate, and includes the steps that carbon dioxide gas is introduced into calcium hydroxide suspension liquid, nano calcium carbonate paste is obtained, nano calcium carbonate boiled paste is obtained after overcarbonization for 5-10 min, a hydrophilic treatment agent is added, when the room temperature is up to 120 DEG C, the stirring modification time is 1-24 h, and the nanocalcium carbonate capable of stably suspending and dispersing in the aqueous solution is obtained after centrifugation or filter pressing, drying, and crushing. According to the preparation method ofthe nano calcium carbonate capable of stably suspending and dispersing in the aqueous solution, through overcarbonization after carbonization of calcium hydroxide prime paste, thus bicarbonate radicals are uniformly distributed on the surfaces of nano calcium carbonate grains, a hydrophilic surface modifier is then added to modify the surface of calcium carbonate, the specific surface energy is lowered, thus the nano calcium carbonate is in a monodisperse state, and stably suspends in the aqueous solution.

Description

technical field [0001] The invention relates to the technical field of preparation and processing of nano calcium carbonate powder, in particular to a preparation method of nano calcium carbonate stably suspended and dispersed in an aqueous solution. Background technique [0002] Nano-calcium carbonate is one of the most widely used nano-materials at present. Its grain size is less than 100nm, its specific surface area is large, its surface energy is high, and it has the unique small size effect and surface effect of nano-materials, making it behave like ordinary calcium carbonate. It has excellent physical and chemical properties and is widely used in industries such as plastics, rubber, inks, coatings, papermaking and paints. However, it is precisely because of the large specific surface area and high surface energy of nano-calcium carbonate that it is easy to agglomerate in aqueous solution, which limits its application in water-based coatings. [0003] The Chinese inven...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y40/00B82Y30/00
Inventor 何丽秋莫淑一龙飞王吉林
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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