Method for preparing nano calcium carbonate

A nano calcium carbonate, stearic acid technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem that the tensile strength and elongation of calendered film products are not strong enough, Ink absorption performance is not good enough, production stability is poor and other problems, to achieve the effect of good surface modification, moderate specific surface area, regular crystal form

Inactive Publication Date: 2017-11-07
QINGYANG COUNTY YONGCHENG CALCIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is urgent to research and develop a method for the production of new products filled with calendered film products, and completely solve the problem of insufficient tensile strength and elongation of calendered film products, poor dispersion, poor ink absorption performance, and poor production stability. And other technical issues, in order to achieve the purpose of quickly occupying the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method of nano-calcium carbonate, comprising the following steps:

[0018] (1) The quicklime obtained after limestone calcined at high temperature is taken out and weighed, and measured by CaO:H 2 Add water at a weight ratio of O=1:3 to digest quicklime, age for 18 hours and then sieve, adjust the temperature of the slurry to room temperature, and refine it into Ca(OH) with a concentration of 12%. 2 slurry;

[0019] (2) Ca(OH) 2 Raw slurry is prepared and refrigerated. When the temperature is adjusted to 20-25°C, add crystal form control agent for reaction, then add dispersant, pass CO 2 Carbonization, stop carbonization when pH=8.4-8.6;

[0020] (3) After thickening the cooked pulp after carbonization, add a composite activator to activate it, and obtain 80nm nano-active calcium carbonate after dehydration, drying, pulverization and classification.

[0021] Further, the composite activator in the step (3) is magnesium oxide, stearic acid and sodium hy...

Embodiment 2

[0027] A preparation method of nanometer calcium carbonate, is characterized in that, comprises the following steps:

[0028] (1) The quicklime obtained after limestone calcined at high temperature is taken out and weighed, and measured by CaO:H 2 Add water at a weight ratio of O=1:1 to digest quicklime, age for 12 hours and then sieve, adjust the temperature of the slurry to room temperature, and refine it into Ca(OH) with a concentration of 10%. 2 slurry;

[0029] (2) Ca(OH) 2 Raw slurry is prepared and refrigerated. When the temperature is adjusted to 20-25°C, add crystal form control agent for reaction, then add dispersant, pass CO 2 Carbonization, stop carbonization when pH=8.4-8.6;

[0030] (3) After thickening the cooked pulp after carbonization, add a composite activator to activate it, and obtain 50nm nano-active calcium carbonate after dehydration, drying, pulverization and classification.

[0031] Further, the composite activator in the step (3) is one or more c...

Embodiment 3

[0037] A preparation method of nanometer calcium carbonate, is characterized in that, comprises the following steps:

[0038] (1) The quicklime obtained after limestone calcined at high temperature is taken out and weighed, and measured by CaO:H 2 Add water at a weight ratio of O=1:5 to digest quicklime, age for 24 hours and then sieve, adjust the temperature of the slurry to room temperature, and refine it into Ca(OH) with a concentration of 10-15%. 2 slurry;

[0039] (2) Ca(OH) 2 Raw slurry is prepared for refrigeration. When the temperature is adjusted to 25°C, add crystal form control agent for reaction, then add dispersant, pass CO 2 Carbonization, stop carbonization when pH=8.4-8.6;

[0040] (3) After thickening the cooked pulp after carbonization, add a composite activator to activate it, and obtain 100nm nano-active calcium carbonate after dehydration, drying, pulverization and classification.

[0041] Further, the composite activator in the step (3) is one or more...

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Abstract

The present invention provides a kind of preparation method of nano-calcium carbonate, comprises the following steps: (1) take out and weigh the quicklime obtained after the limestone is calcined at high temperature, digest the quicklime, and refine it into Ca( OH)2 slurry; (2) Prepare Ca(OH)2 raw slurry for refrigeration, add crystal form control agent to react, then add dispersant, carbonize with CO2, (3) thicken the cooked slurry after carbonization, add Activated by composite activator, dehydrated, dried, pulverized and classified to obtain 50-100nm nano-active calcium carbonate. By adopting the preparation method and surface modification method of nano-calcium carbonate of the present invention, the prepared nano-calcium carbonate has moderate specific surface area, regular crystal form, and good surface modification effect, which can greatly improve the excellent dispersion performance and ink absorption of calendered film products. performance, with very good market value.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of nanometer calcium carbonate. Background technique [0002] Calendered film plays an important role in our country, especially in the northwest region. Due to the small rain and low hair temperature, the use of plastic greenhouses has become an important measure for the development of agricultural production; Products, light box advertisements, engineering waterproofing, daily necessities, etc. have a wide range of applications. Calendered film special nano-calcium carbonate is a special nano-calcium carbonate for the special requirements of calendered film products. In addition to meeting various requirements of calendered film products, it also endows calendered film products with excellent dispersion and ink absorption properties. Nano-calcium carbonate is an inorganic filler with rich raw materials and excellent performance. It ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/182
Inventor 陈永忠
Owner QINGYANG COUNTY YONGCHENG CALCIUM IND
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