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A kind of microchannel reactor and method thereof for preparing modified nano-calcium carbonate

A microchannel reactor, nano-calcium carbonate technology, applied in nanotechnology for materials and surface science, chemical instruments and methods, calcium carbonate/strontium/barium, 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: 2022-06-21
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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  • A kind of microchannel reactor and method thereof for preparing modified nano-calcium carbonate
  • A kind of microchannel reactor and method thereof for preparing modified nano-calcium carbonate

Examples

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Effect test

Embodiment 1

[0045] The quicklime and water are stirred and digested at a mass ratio of 1:20. After 1 hour of reaction, the slag is removed by filtration through a 200-mesh sieve to obtain calcium hydroxide slurry. The solid content of the calcium hydroxide slurry is adjusted to 3%, and a 1% sodium hexametaphosphate solution is added and fully stirred 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 0.0035m / s. At this time, the calcium hydroxide suspension is in a laminar flow state in the main channel. 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, a stable stratifi...

Embodiment 2

[0047] The quicklime and water are stirred and digested at a mass ratio of 1:5. After 1 hour of reaction, the slag is removed by filtration through a 200-mesh sieve to obtain calcium hydroxide slurry. The solid content of the calcium hydroxide slurry is adjusted to 18%, and a 1% sodium hexametaphosphate solution is added and fully stirred 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. 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, a stable stratifie...

Embodiment 3

[0055] The quicklime and water are stirred and digested in a mass ratio of 1:5. After 1 hour of reaction, the slag is removed by filtration through a 200-mesh sieve to obtain calcium hydroxide slurry. The solid content of the calcium hydroxide slurry is adjusted to 20%, and a 1% sodium hexametaphosphate solution is added and fully stirred 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. 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, a stable stratifie...

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Abstract

The invention discloses a microchannel reactor for preparing modified nano-calcium carbonate and a method thereof. The method is as follows: continuously pump calcium hydroxide suspension into the main channel from the inlet end of the microchannel reactor, and at the same time, pump the surface The modifying agent is continuously pumped into the main channel from the branch channel; after the two meet in the main channel, they flow in a stable stratified flow state; the CO after filtering through the microporous membrane 2 The gas is continuously passed from the gas channel into the main channel, and at the intersection of the main channel and the gas channel, the dispersed phase is continuously separated by CO 2 cutting into micro-droplets to obtain modified calcium carbonate suspension; filtering and vacuum drying the modified calcium carbonate suspension to obtain modified nano-calcium carbonate. The present invention uses microchannel reactor technology to prepare and obtain nano-calcium carbonate, so as to achieve the purpose of synchronous preparation and modification, and the dispersion performance of the prepared calcium carbonate is well improved, which is to realize the integration of surface modification and forming A new technological route of operation.

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] The characteristics of nano calcium carbonate are that the particle size is small, and the particle size is only one tenth of that of ordinary light calcium carbonate; the specific surface area is large, and the specific surface area is 8 times larger than that of ordinary light calcium carbonate; The rate is high, and the function has a wide range of application prospects. At present, nano-calcium carbonate is widely used in coatings, plastics, rubber, adhesives, inks, paints, cosmetics and medicine and other industries, especially nano-calcium carbonate with small particle size, which is widely used for its advantages of large specific surface area and non-toxicity. , but the particle size of nano-calcium carbonate prepared by di...

Claims

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Application Information

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Patent Type & Authority Patents(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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