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Preparation method of cubic ultra-fine calcium carbonate particles

An ultra-fine calcium carbonate, cubic technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of not improving product performance, difficult to obtain cubic calcium carbonate, etc., to achieve high performance and additional Value, regular crystal shape, good dispersion effect

Active Publication Date: 2014-03-26
建德华明科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for nano-calcium carbonate, this change will not only not improve the performance of the product, but more importantly, once the reaction system gels, it is difficult to take appropriate measures to remedy, that is, the generation of the gel system has a negative effect on calcium carbonate. The negative effect of product quality is irreversible, so the product particles obtained by the existing method often have coagulation, and it is difficult to obtain cubic calcium carbonate with regular shape.

Method used

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  • Preparation method of cubic ultra-fine calcium carbonate particles
  • Preparation method of cubic ultra-fine calcium carbonate particles
  • Preparation method of cubic ultra-fine calcium carbonate particles

Examples

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Effect test

Embodiment 1

[0033] In a 10L reactor, add 8L of milk of lime with a mass percentage of calcium hydroxide of 12wt%, the temperature is 36°C, and 14.4g of sucrose is added, and a gas with a carbon dioxide concentration of 50% (volume fraction) is introduced under mechanical stirring. , carry out the carbonization reaction, the gas flow rate is 230L / h, when the carbonization reaches a pH of 10, the temperature of the system is 53°C, stop the aeration and add 7.2g of sodium bicarbonate, raise the temperature to 55°C and age for 4h, then re-introduce the above Concentration of carbon dioxide gas, stop ventilation when the pH is 6.5, add sodium stearate emulsion containing 28.8g of sodium stearate, concentration of 20wt%, and temperature of 70°C, perform coating activation treatment for 1h, and then filter while hot, The filter cake is dried at 100°C to obtain cubic nanometer calcium carbonate. The product is regular cubic, the particle size distribution is 80-100nm, and the specific surface is ...

Embodiment 2

[0035] Add 8L of refined milk of lime with a calcium hydroxide mass percentage concentration of 16wt% in a 10L reactor at a temperature of 40°C, add 3.8g of sucrose, and pass in gas with a carbon dioxide concentration of 36% (volume fraction) under mechanical stirring. Carry out the carbonization reaction, the gas flow rate is 300L / h, when the carbonization reaches the pH of 12, the system temperature is 75°C, stop the aeration, keep warm and add 19.2g of sodium chloride, after aging for 8 hours, re-introduce carbon dioxide gas, and wait until the pH is At 6.8, stop ventilation. Add potassium stearate emulsion containing 38.4g of potassium stearate, concentration of 15% (weight concentration) and temperature of 80°C to the calcium carbonate suspension, carry out coating activation treatment for 2 hours, filter while hot, and filter cake in Dry at 100°C to obtain cubic nanometer calcium carbonate. The particle size distribution of this product is 100-130nm, the crystal form is...

Embodiment 3

[0037]Add 8L of refined milk of lime with a mass percentage of calcium hydroxide of 8wt% in a 10L reactor, the initial temperature is 35°C, and 5g of sucrose and 2.2% of glucose are added, stirred and introduced with a carbon dioxide concentration of 67% (volume fraction) Gas, carry out carbonization reaction, the gas flow rate is 160L / h, when the carbonization reaches pH 9, the temperature of the system is 50°C, stop aeration and raise the temperature to 65°C, add 19.2g NaOH, after aging for 2 hours, re-introduce carbon dioxide gas , when the pH is 6.5, stop the ventilation and add sodium abietate emulsion containing 15.4g sodium abietate, the concentration is 10% (weight concentration), and the temperature is 85°C, carry out coating activation treatment for 1.5h, filter while hot, and wash , The filter cake is dried at 100°C to obtain cubic nanometer calcium carbonate. The particle size distribution of this product is 130-150nm, the crystal form is regular cubic, and the spe...

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Abstract

The invention provides a preparation method of cubic ultra-fine calcium carbonate particles. The method comprises the following steps: (1) adding a nucleation promoter to calcium hydroxide suspension liquid, wherein the nucleation promoter is selected from more than one of glucose, sucrose or sodium citrate; (2) carbonizing by introducing carbon dioxide until the pH value is 8-12, adding a crystal modifier and ageing for 0.5-10 hours, wherein the crystal modifier is selected from one of sodium chloride, sodium carbonate, sodium bicarbonate or sodium hydroxide; (3) further introducing carbon dioxide and carbonizing until the pH value is 6.5-7.0; (4) coating by adding a coating agent, filtering and drying to obtain a product, wherein the coating agent is selected from a resin acid, a resin acid alkali metal salt, a fatty acid or a fatty acid alkali metal salt. According to the calcium carbonate particles, the particle sizes are 90-180nm, the calcium carbonate particles are in a cubic shape, and the specific surface area is 10-18m<2> / g. Thus, the cubic ultra-fine calcium carbonate particles can be used as functional fillers in coating, rubber, plastic and sealant industries.

Description

technical field [0001] The invention relates to a preparation method of cubic ultrafine calcium carbonate particles. Background technique [0002] As a new type of functional filler, nano-calcium carbonate is widely used in plastics, rubber, coatings, sealants, inks, papermaking and other fields. The pros and cons of its application performance mainly depend on the chemical composition, morphological characteristics, particle size and distribution of calcium carbonate and other parameters. According to different application systems, the corresponding surface treatment of calcium carbonate, so as to obtain products with good dispersion, narrow particle size distribution, and good compatibility with the matrix interface are the basic requirements for the application of calcium carbonate. Through the control of process technology, the existing technology has been able to prepare nano-calcium carbonate with shapes such as cubic, needle, sheet, and chain ball. [0003] Cubic na...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y40/00
Inventor 陈雪梅吴秋芳马建明成居正邓捷马新胜
Owner 建德华明科技有限公司
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