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Low-basicity superfine activated calcium carbonate and preparation method thereof

An active calcium carbonate, low alkalinity technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of difficult to obtain regular crystal shape and dispersibility, difficult to control the pH point of aging, complicated operation process, etc., to achieve high performance and added value, regular crystal shape, good dispersion effect

Inactive Publication Date: 2016-12-07
SHANGHAI HUAMING HI TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its process control is complicated, and only nano-calcium carbonate with a particle size in the range of 40-80nm can be prepared
Chinese patent CN1375456A carries out carbonization reaction at 28±1°C, adds growth inhibitor, and when the pH of the system is 6.7-7, adopts the method of low-rate carbonization and aging to prepare nano-calcium carbonate, but this method is difficult to obtain regular crystal form and dispersibility good cubic calcium carbonate
The above two methods all adopt the process of primary carbonization, aging and secondary carbonization. The operation process is complicated and the pH point of aging is difficult to control. We found that this method still does not solve the problem of high alkalinity of the product

Method used

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  • Low-basicity superfine activated calcium carbonate and preparation method thereof
  • Low-basicity superfine activated calcium carbonate and preparation method thereof
  • Low-basicity superfine activated calcium carbonate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In a 10L reactor, add 8L milk of lime with a calcium hydroxide mass percentage concentration of 12wt%, when the temperature is 37°C, add 8.0g glucose and 24.0g calcium chloride respectively, and pass in carbon dioxide with a concentration of 50% under mechanical stirring (volume fraction) gas, carry out carbonization reaction, gas flow rate is 230L / h, when carbonization to system pH is 6.7, stop ventilating, after being warming up to 70 ℃, adding concentration is 12wt% sodium stearate emulsion 167ml, coating Activate for 2 hours, then filter while hot, and dry the filter cake at 100°C to obtain cubic superfine calcium carbonate powder. The product has a regular shape, a particle size distribution of 80-100nm, and a specific surface area of ​​19.8m 2 / g, the pH value of the powder is 8.2, and there is no agglomeration phenomenon, see figure 1 .

Embodiment 2

[0034] In a 10L reactor, add 8L calcium hydroxide mass percent concentration and be 15wt% milk of lime, when temperature is 30 ℃, add 1.01g sucrose and 1.07g glucose and 5.20g magnesium chloride respectively, feed carbon dioxide concentration under mechanical stirring. The gas of 36% (volume fraction) carries out carbonization reaction, and gas flow rate is 300L / h, and when carbonization system is to pH 6.5, stop ventilating, be warming up to 80 ℃, add concentration and be 140ml of potassium stearate emulsion of 15wt%, Coating and activating treatment for 1.5h, then filtering while hot, and drying the filter cake at 100°C to obtain cubic ultrafine calcium carbonate powder. The product has a regular appearance, a particle size distribution of 90-120nm, and a specific surface area of ​​17.3m 2 / g, the pH value of the powder is 8.4, and there is no agglomeration phenomenon.

Embodiment 3

[0036] In a 10L reactor, add 8L of milk of lime with a mass percent concentration of calcium hydroxide of 8wt%. When the temperature is 35°C, add 5.76g of sodium citrate and 24.0g of calcium nitrate, and feed in carbon dioxide with a concentration of 25% under mechanical stirring. % (volume fraction) gas, carry out carbonization reaction, gas flow rate is 160L / h, when carbonization to pH is 6.6, stop ventilating, be warming up to 85 ℃, add concentration and be 5wt% sodium abietate emulsion 145ml, coating activation Treat for 1.5h, then filter while hot, and dry the filter cake at 100°C to obtain cubic superfine calcium carbonate powder. The product has a regular shape, a particle size distribution of 100-140nm, a powder pH of 8.1, and a specific surface area of ​​12.3m 2 / g, and no agglomeration, see figure 2 .

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Abstract

The invention relates to low-basicity superfine activated calcium carbonate. The pH of the prepared low-basicity superfine activated calcium carbonate product is smaller than 8.5, and the problem that the basicity of a conventional activated calcium carbonate product is too high is solved, so that the activated calcium carbonate product can also be used for a formula system of a product which is sensitive to the alkalinity, and the special effect of improving dispersibility is achieved. According to a calcium carbonate particle prepared by the method disclosed by the invention, the particle diameter of the calcium carbonate particle is in the range of 80-180nm, the shape of the calcium carbonate particle is cuboid, the particle diameter of the calcium carbonate particle is controllable, the distribution interval of the particle diameter is narrow, the crystal forms are regular, the dispersibility is good, the specific surface area is 10-20m<2 > / g, and the low-basicity superfine activated calcium carbonate can be widely used as a functional filling in the trades of high-grade paint, rubber, plastic, sealants and the like.

Description

technical field [0001] The invention relates to a method for preparing ultrafine calcium carbonate with low alkalinity, in particular to a method for preparing cubic ultrafine calcium carbonate particles with regular appearance, good dispersibility and low alkalinity. Background technique [0002] As a new type of functional filler, ultrafine 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 its particle size and other parameters of calcium carbonate. 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 proces...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 陈雪梅余玉翔孔凡滔吴秋芳
Owner SHANGHAI HUAMING HI TECH GRP
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