Preparation method and thixotropy test method of nano calcium carbonate with negative thixotropy

A nano-calcium carbonate, negative thixotropic technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve the problem of less research on calcium carbonate, and achieve considerable economic benefits and dispersion performance. Excellent, simple equipment effect

Inactive Publication Date: 2014-10-15
福建省万旗非金属材料有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The positive thixotropy research of calcium carbonate is more, as patent CN102161841, patent CN1792803, patent CN101967310 etc. have all introduced the method for preparing high thixotropic calcium carbonate, but it is the calcium carbonate with positive thixotropy, and has Calcium carbonate with negative thixotropic properties has been less studied

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  • Preparation method and thixotropy test method of nano calcium carbonate with negative thixotropy

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specific Embodiment approach

[0026] The preparation method of the present invention is used to prepare a nano-calcium carbonate product with negative thixotropic properties, so that it can be used in the polymer industry to increase its dispersion and help extrusion molding in the polymer industry. Generally, it includes the following steps:

[0027] (1) The optimized natural limestone is calcined at 800°C-1000°C for 6-8 hours to become calcium oxide, then digested with water, passed through a 200-mesh sieve to remove coarse particles, and refined into calcium hydroxide emulsion;

[0028] (2) Adjust the concentration of calcium hydroxide emulsion to 8% to 12% and the temperature to 18°C ​​to 25°C, then send it to the bubbling carbonization tower, and pass in a certain concentration of 25% to 40% of carbon dioxide for bubbling carbonization, carbonization When the pH value is less than 7, it is the end point of carbonization, and the calcium carbonate cooked pulp with a dry powder specific surface area of ...

example 1

[0034] Limestone is calcined at 900°C for 8 hours. After the calcination is completed, it is slightly cooled and placed in clean water for digestion reaction. After digestion, it is passed through 200 sieves to obtain refined milk of lime, and then water is added to adjust the solubility of milk of lime to 10%. After the temperature is 20°C, it is sent to the bubbling carbonization tower, and carbon dioxide gas with a concentration of 30% is introduced for carbonization, and the carbonization is carried out until the pH value is less than 7, and the carbonization is terminated. The specific surface area of ​​the dry powder is measured to be 36.4m2 / g; The slurry was precipitated, and the supernatant water was removed, and concentrated to a concentration of 20%. Send this cooked pulp into the activation reaction tank, add the configured stearic acid saponification solution (wherein the consumption of stearic acid is 5% of dry basis calcium carbonate quality, the preparation of it...

example 2

[0036] The operation method of example 2 is identical with example 1, and difference is that the specific surface area of ​​the dry powder calcium carbonate that carbonization obtains is 34.6 m / g, and the consumption of the 12-hydroxy stearic acid that adds is 1.5% of dry basis nanometer calcium carbonate quality.

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Abstract

The invention discloses a preparation method and a thixotropy test method of nano calcium carbonate with negative thixotropy, and the preparation method includes (1) calcining limestone at 800-1000DEG C to obtain calcium oxide, adding water to digest, sieving to remove coarse particles, refining into calcium hydroxide emulsion; (2) adjusting the calcium hydroxide emulsion concentration and temperature, then sending into a bubbling carbonation tower, leading in certain concentrations of carbon dioxide for bubbling carbonation, carbonating to the pH value to be less than 7 for carbide carbonation end point, selecting calcium carbonate boiled pulp with the dry powder specific surface area of 25 m<2> / g-40 m<2> / g; (3) sending the calcium carbonate boiled pulp into an activation reaction tank, adding a certain proportion of medium and long chain fat fatty acid saponification liquid for wet activation treatment; and (4) filtering by pressing, drying and crushing the activated activation solution, sending into a high-speed mixer, adding a certain proportion of hydroxy fatty acids for dry activation for a certain time at the temperature of 50-70DEG C, and after the activation packing to obtain the nano calcium carbonate with the negative thixotropy.

Description

technical field [0001] The invention relates to the field of preparation of nano-calcium carbonate, in particular to performance testing of the preparation of thixotropic nano-calcium carbonate. Background technique [0002] As an inorganic chemical product, calcium carbonate has been widely used in many fields, such as papermaking, daily necessities chemical industry, coatings, adhesives, plastics and other industries. Under normal circumstances, calcium carbonate powder plays the role of incremental filling, and with the development of science and technology, the application of functional calcium carbonate has been paid more and more attention. For example, the adhesive industry requires calcium carbonate to have reinforcing properties, and the coating industry requires Added calcium carbonate has thixotropy and the like. However, the surface of calcium carbonate is hydrophilic and oleophobic, and it is easy to form aggregates, with poor dispersion and poor direct applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08G01N11/00B82Y30/00B82Y40/00
Inventor 罗伟苏承炎谢文清郑新烟林新仁
Owner 福建省万旗非金属材料有限公司
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