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Micro-channel reactor for preparing modified nano calcium carbonate and method thereof

A microchannel reactor, nano-calcium carbonate technology, applied in nanotechnology for materials and surface science, calcium carbonate/strontium/barium, chemical instruments and methods, etc. It can solve the problems of poor homogenization, dispersion and modification effect, and decline in material properties, so as to achieve the effect of favorable for explosive nucleation, small mixing scale and shortened reaction time.

Active Publication Date: 2021-04-09
浙江海拓新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the application of nano-calcium carbonate, it is found that nano-calcium carbonate has the following defects: the small particle size leads to strong adsorption, the particles are agglomerated with each other, and the dispersion in the polymer matrix is ​​poor; the surface of nano-calcium carbonate has many hydroxyl groups, which is easy to Adsorb water, calcium carbonate without surface treatment, its surface is hydrophilic and oleophobic, showing strong polarity, it is difficult to disperse evenly in organic medium; When impacted, the performance of the material decreases
However, in the existing technique for preparing modified nano-calcium carbonate, the prepared modified nano-calcium carbonate has problems such as uneven particle size, particle agglomeration, dispersion and poor modification effect. Therefore, it is urgent to provide a method that can overcome the above-mentioned The preparation method of modified nanometer calcium carbonate

Method used

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  • Micro-channel reactor for preparing modified nano calcium carbonate and method thereof
  • Micro-channel reactor for preparing modified nano calcium carbonate and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The quicklime and water are stirred and digested according to the mass ratio of 1:20. After reacting for 1 hour, the slag is filtered through a 200-mesh sieve to obtain calcium hydroxide slurry. Adjust the solid content of the calcium hydroxide slurry to 3%, add 1% sodium hexametaphosphate solution and stir thoroughly to obtain a homogeneous calcium hydroxide suspension. The calcium hydroxide suspension is continuously pumped into the main channel of the microchannel reactor at a flow rate of 0.0035m / s. At this time, the calcium hydroxide suspension is in a laminar flow state in the main channel. At the same time, the surface modifier is The flow rate is continuously pumped into the branch channels of the microchannel reactor. The calcium hydroxide suspension is wrapped by the surface modifier at the intersection of the main channel and the branch channel to form a dispersed phase together. After the calcium hydroxide suspension and the surface modifier meet in the main...

Embodiment 2

[0047] Stir quicklime and water at a mass ratio of 1:5 for digestion. After reacting for 1 hour, filter through a 200-mesh sieve to obtain calcium hydroxide slurry. Adjust the solid content of the calcium hydroxide slurry to 18%, add 1% sodium hexametaphosphate solution and stir thoroughly to prepare a homogeneous calcium hydroxide suspension. The calcium hydroxide suspension is continuously pumped into the main channel of the microchannel reactor at a flow rate of 0.003m / s. At this time, the calcium hydroxide suspension is in a laminar flow state in the main channel. At the same time, the surface modifier is The flow rate is continuously pumped into the branch channels of the microchannel reactor. The calcium hydroxide suspension is wrapped by the surface modifier at the intersection of the main channel and the branch channel to form a dispersed phase together. After the calcium hydroxide suspension and the surface modifier meet in the main channel, they form a stable stratif...

Embodiment 3

[0055] Stir quicklime and water at a mass ratio of 1:5 for digestion. After reacting for 1 hour, filter through a 200-mesh sieve to obtain calcium hydroxide slurry. Adjust the solid content of the calcium hydroxide slurry to 20%, add 1% sodium hexametaphosphate solution and stir thoroughly to prepare a homogeneous calcium hydroxide suspension. The calcium hydroxide suspension is continuously pumped into the main channel of the microchannel reactor at a flow rate of 0.004m / s. At this time, the calcium hydroxide suspension is in a laminar flow state in the main channel. At the same time, the surface modifier is The flow rate is continuously pumped into the branch channels of the microchannel reactor. The calcium hydroxide suspension is wrapped by the surface modifier at the intersection of the main channel and the branch channel to form a dispersed phase together. After the calcium hydroxide suspension and the surface modifier meet in the main channel, they form a stable stratif...

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Abstract

The invention discloses a micro-channel reactor and method for preparing modified nano calcium carbonate. The method comprises the following steps: continuously pumping calcium hydroxide suspension into a main channel from the inlet end of the micro-channel reactor, and meanwhile, continuously pumping a surface modifier into the main channel from a branch channel; making the calcium hydroxide suspension and the surface modifier converge in the main channel and then flow in a stable layered flow state; continuously introducing CO2 gas filtered by a microporous filter membrane into the main channel from a gas channel, and cutting the dispersion phase into micro-droplets by continuous CO2 at the intersection of the main channel and the gas channel to obtain a modified calcium carbonate suspension; and filtering the modified calcium carbonate suspension, and carrying out vacuum drying to obtain the modified nano calcium carbonate. According to the method for preparing nano calcium carbonate by utilizing a micro-channel reactor technology, the purpose of synchronously carrying out preparation and modification is achieved, the dispersion performance of the prepared calcium carbonate is well improved, and the method is a new process technical route integrating surface modification and forming.

Description

technical field [0001] The invention belongs to the field of calcium carbonate preparation, and in particular relates to a microchannel reactor for preparing modified nanometer calcium carbonate and a method thereof. Background technique [0002] Nano-calcium carbonate is characterized by small particle size, which is only one-tenth of the particle size of ordinary light calcium carbonate; large specific surface area, which is 8 times larger than ordinary light calcium carbonate; the surface is activated and activated. The rate is high, and the functional application prospect is broad. At present, nano-calcium carbonate is widely used in coatings, plastics, rubber, adhesives, inks, paints, cosmetics and pharmaceuticals, especially nano-calcium carbonate with a small particle size, which is widely used due to its large specific surface area and non-toxicity. , but the particle size of nano-calcium carbonate prepared by different methods is different, which makes it particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01J19/24C01F11/18B82Y30/00
CPCB01J19/0093B01J19/2415C01F11/182B82Y30/00C01P2004/64
Inventor 严琴陈新才余华东金素素蒋林孙关炳王志忠
Owner 浙江海拓新材料有限公司
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