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Method for modifying surface of nano calcium carbonate

A nano-calcium carbonate, surface modification technology, applied in the direction of fibrous fillers, dyed low-molecular-weight organic compounds, etc., can solve the problems of high pH value, large amount of inorganic alkali, incomplete saponification, etc., and achieve high activation rate, The effect of low production cost and good economic benefits

Active Publication Date: 2018-05-18
ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method utilizes the principle of higher solubility of fatty acid salts to add inorganic alkali before calcium carbonate slurry modification, and then add fatty acid surface modification, the purpose is to complete the saponification of fatty acids while adsorbing, so that fatty acids can be dispersed more uniformly in the slurry The coating is better, but the amount of inorganic alkali is large, the saponification is not complete, and the cost is increased, and the pH value of the product is high at the same time
[0007] In summary, in the process of treating calcium carbonate with fatty acids and their salts, sodium stearate is mainly obtained by saponifying fatty acids with inorganic bases, or organic substances such as absolute ethanol are used as solvents for modifiers to remove hard calcium carbonate. Interfacial resistance between fatty acid and aqueous phase, but increases cost and causes adverse side effects

Method used

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  • Method for modifying surface of nano calcium carbonate
  • Method for modifying surface of nano calcium carbonate
  • Method for modifying surface of nano calcium carbonate

Examples

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Effect test

Embodiment 1

[0032] A method for surface modification of nano-calcium carbonate, comprising the following steps:

[0033] S1: Adjust the specific gravity of the refined milk of lime to 1.065, add it into the bubbling carbonation reaction kettle, and then pass in a mixed gas containing 33% carbon dioxide to carry out the carbonation reaction, and the carbonation to pH=7.0 is the end point, and the specific surface area is obtained. 24.6m 2 / g of nano-calcium carbonate suspension;

[0034] S2: Add ethylenediaminetetraacetate (disodium EDTA) stabilizer to the nano-calcium carbonate suspension, the dosage of the stabilizer is 0.5% of the dry mass of calcium carbonate, the temperature is controlled at 55° C., and the temperature is kept for 20 minutes;

[0035] S3: After heating and melting the stearic acid modifier in water, add sodium dodecylbenzenesulfonate emulsifier, and stir for 20 min at a rotating speed of 150r / min to obtain a modifier emulsion; the stearic acid modifier The total con...

Embodiment 2

[0038] A method for surface modification of nano-calcium carbonate, comprising the following steps:

[0039] S1: Adjust the specific gravity of the refined milk of lime to 1.060, add it to the bubbling carbonation reaction kettle, and then pass in a mixed gas containing 35% carbon dioxide to carry out the carbonation reaction, and the carbonation to pH=7.0 is the end point, and the specific surface area is obtained as 22.8m 2 / g of nano-calcium carbonate suspension;

[0040] S2: adding sodium nitrilotriacetate (NTA) stabilizer to the nano-calcium carbonate suspension, the dosage of the stabilizer is 2.5% of the dry mass of calcium carbonate, the temperature is controlled at 60° C., and the temperature is kept for 20 minutes;

[0041] S3: After heating and melting the arachidic acid modifier in water, add a diglycerin polypropylene glycol ether emulsifier, and stir for 10 minutes at a rotating speed of 300r / min to obtain a modifier emulsion; the total amount of the arachidic a...

Embodiment 3

[0044] A method for surface modification of nano-calcium carbonate, comprising the following steps:

[0045] S1: Adjust the specific gravity of the refined milk of lime to 1.070, add it into the bubbling carbonation reaction kettle, and then pass in a mixed gas containing 33% carbon dioxide to carry out the carbonation reaction, and the carbonation to pH=7.0 is the end point, and the specific surface area is obtained. 28.9m 2 / g of nano-calcium carbonate suspension;

[0046] S2: Add ethylenediamine tetramethylene phosphate (EDTMPS) stabilizer to the nano-calcium carbonate suspension, the amount of the stabilizer is 1.5% of the dry mass of calcium carbonate, the temperature is controlled at 50 ° C, and the temperature is kept for 30 minutes;

[0047] S3: After heating and melting the lauric acid modifier in water, add a fatty alcohol polyoxyethylene ether emulsifier, and stir for 30 minutes at a rotating speed of 100r / min to obtain a modifier emulsion; the total amount of the ...

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Abstract

The invention discloses a method for modifying the surface of nano calcium carbonate. The method comprises the steps that 1, lime milk is added to a bubbling carbonatation reaction kettle, mixed gas containing carbon dioxide is introduced to the reaction kettle for a carbonatation reaction, carbonatation is conducted till the pH is equal to 7.0, carbonatation is completed, and a nano calcium carbonate suspension solution is obtained; 2, a stabilizer is added to the nano calcium carbonate suspension solution, the temperature is controlled within 50-60 DEG C, and heat preservation is conducted for 20-30 min; 3, a fatty acid modifier is heated and melted in water, an emulsifier is added to the fatty acid modifier, stirring is conducted for 10-30 min, and a modifier emulsion is obtained; 4, the nano calcium carbonate suspension solution obtained in the second step is added to the modifier emulsion, stirring is conducted for 30-60 min, and then through filter-pressing dehydration, drying and smashing, a nano calcium carbonate product is obtained. The prepared nano calcium carbonate has the advantages of good dispersity and processability, low oil absorption value, high thixotropy and activation rate, good stability, pH value close to neutral and the like. The method is low in production cost and simple in technology, facilitates industrial production and has good economic, social and ecological benefits.

Description

technical field [0001] The invention relates to the technical field of calcium carbonate modification, in particular to a method for surface modification of nanometer calcium carbonate. Background technique [0002] Calcium carbonate is a widely used inorganic non-metallic material, especially nano-calcium carbonate products due to its easy-to-obtain raw material sources, low price, high whiteness, excellent performance, less pollution in the production process, and good filling and processing performance. It is widely used in various fields such as rubber, plastics, sealants, automotive primers, paints, inks, paper, food, and medicine. In industrial production, carbonation method is usually used to prepare nano-calcium carbonate. The nano-calcium carbonate prepared by this method is prone to dissolution, recrystallization and alkali return of calcium carbonate particles during storage. The dissolution, recrystallization and alkali return of calcium carbonate particles will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08
CPCC01P2004/60C01P2006/19C01P2006/22C09C1/021C09C3/08
Inventor 刘卢科朱勇蓝擎彭炜翔陆武邦黄辉亮
Owner ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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