Surface modification method for nano calcium carbonate

A nano calcium carbonate, surface modification technology, applied in fibrous filler, dyeing physical treatment, dyeing low molecular organic compound treatment and other directions, can solve the problem of no industrial application value, no breakthrough progress, complex modification process, etc. problems, to achieve the best surface modification effect, outstanding enhancement function, and good technical and economic effects.

Active Publication Date: 2011-09-07
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Generally speaking, stearic acid (salt) is cheap and easy to obtain, and the wet surface modification of nano-calcium carbonate is simple and effective. It has a long application history and relatively mature technology. There are still some insurmountable problems in sexual applications, and there has been no breakthrough in this technology in recent years
Although many other nano-calcium carbonate surface modification methods have been reported and disclosed at home and abroad except stearic acid (salt) wet modification, these methods are either expensive modifiers, complex modification processes, or relatively low modification effects. Poor, mostly flashy, no industrial application value

Method used

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  • Surface modification method for nano calcium carbonate
  • Surface modification method for nano calcium carbonate
  • Surface modification method for nano calcium carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step: adding 5.2g NaOH (0.00011mol / gCaCO 3 ) and apply continuous mechanical stirring, so that the alkali is evenly dispersed in the slurry and completely dissolved.

[0038] Step 2: Maintain mechanical stirring for the nano calcium carbonate slurry obtained in step 1 and rapidly heat to 90.0°C.

[0039] Step 3: under mechanical stirring, add 34.5g stearic acid (0.00010mol / gCaCO 3 ), and continued stirring for 60min.

[0040] Step 4: filtering, drying, pulverizing and depolymerizing the nano-calcium carbonate slurry obtained in the third step to obtain surface-modified nano-calcium carbonate.

Embodiment 2

[0042] The first step: adding 5.8g NaOH (0.00013mol / gCaCO in the newly prepared nano-calcium carbonate slurry of 11.5% in 10.0kg mass concentration 3 ) and apply continuous mechanical stirring, so that the alkali is evenly dispersed in the slurry and completely dissolved.

[0043] Step 2: Maintain mechanical stirring for the nano calcium carbonate slurry obtained in step 1 and rapidly heat to 90.0°C.

[0044] The 3rd step: under the assistance of mechanical stirring, add 34.5g palmitic acid (0.00012mol / gCaCO3) in the nano-calcium carbonate slurry obtained by the 2nd step 3 ), and continued to stir for 60 min.

[0045] Step 4: filtering, drying, pulverizing and depolymerizing the nano-calcium carbonate slurry obtained in the third step to obtain surface-modified nano-calcium carbonate.

Embodiment 3

[0047] Step 1: adding 5.2g NaOH (0.00011mol / gCaCO 3 ) and apply continuous mechanical stirring, so that the alkali is evenly dispersed in the slurry and completely dissolved.

[0048] Step 2: Maintain mechanical stirring for the nano calcium carbonate slurry obtained in step 1 and rapidly heat to 90.0°C.

[0049] The 3rd step: under the assistance of mechanical stirring, add the mixture (0.00010mol / gCaCO 3 ), and continued stirring for 60min.

[0050] Step 4: filtering, drying, pulverizing and depolymerizing the nano-calcium carbonate slurry obtained in the third step to obtain surface-modified nano-calcium carbonate.

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Abstract

The invention discloses a surface modification method for nano calcium carbonate, which is characterized by comprising the following steps of: adding inorganic alkali into nano calcium carbonate slurry, uniformly stirring, heating the slurry, adding fatty acid and performing surface modification. The method comprises the following specific steps of: adding a certain amount of nano calcium carbonate slurry into a reaction kettle, adding 0.00004 to 0.00040mol of inorganic alkali into 1g of CaCO3, and uniformly stirring; heating to the temperature of between 75.0 and 90.0 DEG C, adding 0.00005 to 0.00035mol of fatty acid or fatty acid salt into 1g of nano calcium carbonate (CaCO3) slurry, reacting, and continuously stirring for 30 to 120 minutes; and after surface modification reaction is finished, cooling, filtering, washing, drying and grinding the slurry to obtain the nano calcium carbonate subjected to surface modification. The method is simple and practicable, a modifier can form a uniform and complete coating layer on the surface of the nano calcium carbonate, and the modified product has a good application effect in polymer such as silicone sealant, polyvinyl chloride (PVC) paste resin and the like.

Description

Technical field: [0001] The invention relates to a method for modifying an inorganic material, in particular to a method for modifying the surface of nanometer calcium carbonate. technical background: [0002] Nano-calcium carbonate is an extremely important type of industrial calcium carbonate. Its preparation technology is complex and its production added value is high. It is widely used in plastics, rubber, coatings, inks and other fields. Nano-calcium carbonate does not have the so-called small size effect, quantum size effect and macroscopic quantum tunneling effect of general nanomaterials. However, due to its large specific surface area, it has high surface activity and exhibits strong surface binding energy. The application of high-quality nano-calcium carbonate to polymer materials not only plays the role of incremental filling, but also endows some polymer composite materials with better processing properties, improves the mechanical properties of composite materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/04C08L83/04C08L27/06C08K9/04C08K3/26
Inventor 朱勇黄炜民黄安定黄炜波
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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