Preparation method of modified calcium carbonate

A calcium carbonate and modification technology, applied in the field of calcium carbonate, can solve the problems of easy falling off of starch and low paper strength, and achieve the effect of improving retention rate and improving binding force

Active Publication Date: 2015-08-12
SHANDONG YUANGEN CHEM TECH RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the technical problems of starch-modified calcium carbonate produced by the above-mentioned traditional process when it is added to paper, the starch is easy

Method used

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  • Preparation method of modified calcium carbonate
  • Preparation method of modified calcium carbonate
  • Preparation method of modified calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: preparation steps:

[0032] ①Put the three-neck flask with a dry weight of 10g of calcium carbonate suspension in a constant temperature water bath, and stir the suspension at 450rpm until it reaches a temperature of 85°C;

[0033] ②Add 10g of raw cornstarch of the same quality to a three-necked bottle, and stir for 60 minutes;

[0034] ③Add 1g of stearic acid, and adjust the pH value to 11 with NaOH solution;

[0035] ④Add 2g of cis-12hydroxyoctadecene-3-methyl-imidazole hexafluorophosphate and tetrafluoroboric acid-1-butyl-3-methylimidazole compound, the ratio is 3:2, stir for 85 Keep warm for 30min at ℃;

[0036] ⑤ Adjust the pH of the solution to 5 with hydrochloric acid, stir for 1 min and then stand still for 30 s, centrifuge the mixture suspension with a centrifuge tube, wash the precipitate with distilled water, and collect the complex on filter paper.

Embodiment 2

[0037] Embodiment 2: preparation steps:

[0038] ①Put the three-neck flask with a dry weight of 10g of calcium carbonate suspension in a constant temperature water bath, and stir the suspension at 450rpm until it reaches a temperature of 85°C;

[0039] ②Add 10g of raw cornstarch of the same quality to a three-necked bottle, and stir for 60 minutes;

[0040] ③Add 1g of stearic acid, and adjust the pH value to 11 with NaOH solution;

[0041] ④Add 4g of cis-12hydroxyoctadecene-3-methyl-imidazole hexafluorophosphate and tetrafluoroboric acid-1-butyl-3-methylimidazole compound, the ratio is 3:2, stir for 85 Keep warm for 30min at ℃;

[0042] ⑤ Adjust the pH of the solution to 5 with hydrochloric acid, stir for 1 min and then stand still for 30 s, centrifuge the mixture suspension with a centrifuge tube, wash the precipitate with distilled water, and collect the complex on filter paper.

Embodiment 3

[0043] Embodiment 3: preparation steps:

[0044]①Put the three-neck flask with a dry weight of 10g of calcium carbonate suspension in a constant temperature water bath, and stir the suspension at 450rpm until it reaches a temperature of 85°C;

[0045] ②Add 10g of raw cornstarch of the same quality to a three-necked bottle, and stir for 60 minutes;

[0046] ③Add 1g of stearic acid, and adjust the pH value to 11 with NaOH solution;

[0047] ④Add 6g of cis-12hydroxyoctadecene-3-methyl-imidazole hexafluorophosphate and tetrafluoroboric acid-1-butyl-3-methylimidazole compound, the ratio is 3:2, stir for 85 Keep warm for 30min at ℃;

[0048] ⑤ Adjust the pH of the solution to 5 with hydrochloric acid, stir for 1 min and then stand still for 30 s, centrifuge the mixture suspension with a centrifuge tube, wash the precipitate with distilled water, and collect the complex on filter paper.

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Abstract

The invention belongs to the field of calcium carbonate, and in particular relates to a preparation method of modified calcium carbonate. The method includes the following steps: A, stirring, B, adding corn starch and stirring evenly; C, adding a modifier, and making the mixture pH value alkaline; D, adding ionic liquid and stirring evenly; E, adjusting pH value, and making the mixture pH value acid, F, separating the liquid to obtain a precipitate; and G, washing to obtain the modified calcium carbonate. Compared with the prior art, the preparation method has the advantages and positive effects in that: the obtained modified calcium carbonate is added into the paper making process by changing the traditional technological process, the bonding strength between fiber and a filling material can be improved, the retention rate of the filling material can be improved, and the paper strength may not be reduced.

Description

technical field [0001] The invention belongs to the field of calcium carbonate, in particular to a preparation method of modified calcium carbonate. Background technique [0002] Calcium carbonate, as an inorganic salt, has extremely important uses in papermaking, plastics and various other industries. However, when the unmodified calcium carbonate is directly added to the paper material system by the traditional filling method, the bonding strength between fibers decreases with the increase of the filling amount. At present, it is generally believed that unmodified calcium carbonate has little contribution to the strength of paper, but it will lead to a decline in the strength performance of filled paper. Calcium carbonate will also have a negative impact on the sizing process of papermaking. The sizing agent is adsorbed on the surface of calcium carbonate particles. Under the condition that the performance of the paper product meets the actual demand, the demand for the s...

Claims

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Application Information

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IPC IPC(8): D21H17/69
Inventor 王伟陈永梅张丰庆仲亚杰袁俊洲刘珊珊
Owner SHANDONG YUANGEN CHEM TECH RES & DEV CO LTD
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