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Nano calcium carbonate transparent dispersoid and preparation method thereof

A technology of nano-calcium carbonate and dispersion, which is applied in the field of dispersion, can solve problems such as complex processes, and achieve the effects of simple process flow, easy scale-up, and good product quality

Active Publication Date: 2014-04-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned inventions all carry out surface modification or coating on nano-calcium carbonate, and the process is complex

Method used

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  • Nano calcium carbonate transparent dispersoid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 9.16g ammonium dodecylbenzenesulfonate, 13g white oil, 30g xylene, 10g Ca(OH) into the reactor with high-speed stirring 2 and 8g of ethanol, fully mixed for neutralization reaction, the stirring speed was 3000r / min, the temperature was raised to 40°C, and CO was introduced after 60min 2 , Stop ventilation after 45min of reaction. After pouring out the solution, distill under reduced pressure at 100°C to remove water and ethanol, add a certain amount of xylene and then centrifuge. The centrifugation speed is 3000rpm, and the centrifugation time is 40min. After the slag is removed, vacuum distillation at 90°C is carried out again to remove xylene to obtain the product. The product is transparent, with a solid content of 20%, an alkali value of 243.81mgKOH / g, and no sedimentation after standing for several months.

Embodiment 2

[0029] Put 6.14g of petroleum ammonium sulfonate, 7.14g of white oil, and 30g of petroleum ether into a 100mL four-neck flask with an electric stirring paddle, and then put 7.1g of Ca(OH) into it after stirring evenly with the stirring paddle. 2 And 4.8g methanol, start to carry out neutralization reaction, stirring speed is 3000r / min. Begin heating to 50°C. After 5 minutes of heat preservation, CO was introduced 2 , Stop ventilation after 55min of reaction. Pour out the solution, distill under reduced pressure at 50°C to remove water and methanol, add a certain amount of petroleum ether, and then centrifuge. The centrifugation speed is 4000rpm, and the centrifugation time is 40min. After removing the slag, conduct vacuum distillation again at 50°C to remove petroleum ether to obtain the product. The product is deep red and transparent, with a solid content of 40% and an alkali value of 358.96mgKOH / g, and it has not settled after standing for several months.

Embodiment 3

[0031] Put 9.3g of petroleum sulfonic acid, 11g of white oil, 45g of gasoline, and 10.5g of Ca(OH) into a 250mL four-neck flask with an electric stirring paddle 2 and 12g isopropanol, fully mixed to carry out neutralization reaction, the stirring speed is 3000r / min. Begin heating to 70°C. After 20 min of heat preservation, CO was introduced 2 , Stop ventilation after 30min of reaction. After pouring out the solution, distill under reduced pressure at 80°C to remove water and isopropanol, add a certain amount of gasoline and then centrifuge. The centrifugation speed is 5000rpm, and the centrifugation time is 30min. After deslagging, carry out vacuum distillation again at 80°C to remove gasoline to obtain the product. The product is deep red and transparent, with a solid content of 25.10% and an alkali value of 292.3mgKOH / g, and it has not settled after standing for several months.

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Abstract

The invention discloses a nano calcium carbonate transparent dispersoid and a preparation method thereof and belongs to the technical field of the dispersoids. The nano calcium carbonate white oil dispersoid is prepared in one step by using white oil as a dispersing medium, and a method for enabling nano calcium carbonate to form inverted water-in-oil microemulsion in an organic solvent. The preparation method comprises the following steps: a surface active agent, the white oil, the organic solvent, Ca(OH)2 and an accelerator are used as raw materials, and CO2 is inlet to synthesize the nano calcium carbonate white oil dispersoid with the solid content of 10-60 percent and the alkaline value of 200-500 milligrams of KOH per gram. A product synthesized by the preparation method disclosed by the invention is high in transparency; the particle size of the obtained nano calcium carbonate is small and uniform in distribution, and the particle diameter is 5-50 nm. The technology process is simple, the operation is easy, the repetitiveness is high, and the product stability is high.

Description

technical field [0001] The invention relates to a nano-calcium carbonate transparent dispersion and a preparation method thereof, which can be applied in the fields of oil additives, plastics and rubber, and belongs to the technical field of dispersions. Background technique [0002] At present, the preparation technology of nano-calcium carbonate powder is quite proficient at home and abroad, but there are few reports about the preparation of nano-calcium carbonate transparent dispersion. At present, the preparation of oil dispersions of nanoparticles mostly adopts a three-step method, that is, firstly synthesize nanoparticles, then modify the surface of nanoparticles with various surfactants, and finally add them to oil for dispersion. [0003] White oil dispersions can be used as lubricants and paints in the textile industry, as filler oils in the rubber industry, and as plasticizers and internal lubricants for polymers in the plastics industry. The present invention can...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/08
Inventor 陈建峰王颖慧王洁欣
Owner BEIJING UNIV OF CHEM TECH
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