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Preparation method of calcium carbonate whiskers by aluminic acid ester and sodium stearate in situ modification

A technology of calcium carbonate whisker and sodium stearate, applied in the direction of fibrous filler, dyed low molecular organic compound treatment, etc., can solve the problem of large amount of modification modifier, non-concentrated product particle size, poor coating effect, etc. problem, to achieve the effect of small usage, improved overall physical performance and low cost

Active Publication Date: 2015-04-08
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method for in-situ modification of calcium carbonate whiskers with aluminate and sodium stearate, which can directly obtain calcium carbonate whiskers with concentrated particle size distribution, high activation degree and needle-like shape. Calcium, which solves the problem that the traditional mechanically modified calcium carbonate has too much force when kneading, the whiskers break, the product size is not concentrated, and the coating effect is poor. The problem of uneven coverage

Method used

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  • Preparation method of calcium carbonate whiskers by aluminic acid ester and sodium stearate in situ modification
  • Preparation method of calcium carbonate whiskers by aluminic acid ester and sodium stearate in situ modification
  • Preparation method of calcium carbonate whiskers by aluminic acid ester and sodium stearate in situ modification

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Experimental program
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Effect test

Embodiment 1

[0021] Under the conditions of 80°C and stirring speed of 900 rpm, the magnesium chloride solution was added in advance to the calcium hydroxide slurry with a mass concentration of 1.5% after being digested and aged for 12 hours after being filtered through a 200-mesh sieve, and the mixture was The molar ratio of magnesium to calcium is 2.5, mixing and stirring for 10 minutes, and at a rate of 100 liters / minute, a gas with a volume ratio of 1:3 of carbon dioxide and nitrogen is introduced to carry out carbonization reaction, and when the carbonation rate is 20%, add Quality is 3% aluminate of calcium hydroxide slurry quality and quality is that the sodium stearate of 1% of calcium hydroxide slurry quality is modified, when reaction solution pH reaches 7, continue aeration after 30 minutes for reaction End point: washing the reaction solution, suction filtering, and drying at 110° C. for 5 hours to obtain functional calcium carbonate whiskers.

[0022] The aspect ratio of the m...

Embodiment 2

[0024] Under the conditions of 70°C and stirring speed of 600 rpm, the magnesium chloride solution was added in advance to the calcium hydroxide slurry with a mass concentration of 1.5% after being digested and aged for 12 hours after being filtered through a 200 mesh sieve, and the mixture was The molar ratio of magnesium to calcium is 2.0, mixing and stirring for 10 minutes, and at a rate of 90 liters / minute, a gas with a volume ratio of 1:3 of carbon dioxide and nitrogen is introduced to carry out carbonization reaction, and when the carbonation rate is 60%, add The quality is 1% of the aluminate of calcium hydroxide slurry quality and the quality is 1% sodium stearate of calcium hydroxide slurry quality to carry out modification, when reaction liquid pH reaches 7, continue ventilating for 30 minutes and then react End point: washing the reaction solution, suction filtering, and drying at 110° C. for 5 hours to obtain functional calcium carbonate whiskers.

[0025] The aspe...

Embodiment 3

[0027] Under the conditions of 80°C and a stirring speed of 750 rpm, add magnesium chloride solution in advance to the calcium hydroxide slurry with a mass concentration of 0.5% after digestion and aging for 12 hours after filtering through a 200 mesh sieve, and make the mixture The molar ratio of magnesium to calcium is 1.0, mixing and stirring for 10 minutes, and under the condition of a speed of 80 liters / minute, a gas with a volume ratio of carbon dioxide and nitrogen of 1:3 is introduced to carry out carbonization reaction, and when the carbonation rate is 100%, add Quality is 2% aluminate of calcium hydroxide slurry quality and quality is the sodium stearate of 1% of calcium hydroxide slurry quality to carry out modification, when reaction solution pH reaches 7, continue aeration after 30 minutes for reaction End point: washing the reaction solution, suction filtering, and drying at 110° C. for 5 hours to obtain functional calcium carbonate whiskers.

[0028] The aspect ...

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Abstract

The invention discloses a preparation method of calcium carbonate whiskers by aluminic acid ester and sodium stearate in situ modification. The preparation method of the calcium carbonate whiskers comprises the following steps: adding a magnesium chloride solution into a calcium hydroxide slurry with a mass concentration of 0.5-1.5% under the condition with the temperature of 70-80 DEG C and a stirring rotation rate of 600-900 rotations per minute, enabling a mole ratio of calcium to magnesium in a mixture to be 1 to 2.5, stirring for 10 minutes, introducing gas with carbon dioxide and nitrogen according to a volume ratio of 1 to 3 under the condition with a rate of 10-100 liters per minute, adding aluminic acid ester and sodium stearate to modify, further introducing gas for 30 minutes when the pH value of a reaction solution reaches 7, then ending the reaction; washing, carrying out suction filtration and drying the reaction solution to obtain functional calcium carbonate whiskers, wherein the adding amount of aluminic acid ester is 0.5%-3% of the mass of the calcium hydroxide slurry, and the adding amount of sodium stearate is 0.5%-1.5% of the calcium hydroxide slurry. The whiskers prepared by the method are needle-shaped, and are intensive in particle diameter distribution and high in activation grade; when the whiskers are used as papermaking fillers, the performance of paper can be improved; a high retention rate is retained; the preparation process is simple; the reaction conditions are mild; the industrial production is liable to implement.

Description

technical field [0001] The invention relates to the technical field of inorganic synthesis, in particular to a preparation method for in-situ modification of calcium carbonate whiskers by using aluminate and sodium stearate. Background technique [0002] As the main filler in papermaking, calcium carbonate can improve the uniformity of the paper by filling the gaps in the paper, provide a smoother surface, increase the opacity and whiteness of the paper, increase the printability, increase the dimensional stability and reduce the The cost of paper. Calcium carbonate belongs to multi-type crystals, mainly including calcite, aragonite and vaterite. Calcium carbonate usually exists in nature as the most stable calcite type. Calcium carbonate whiskers belong to the aragonite structure and have a unique needle-like structure, so the filling amount of calcium carbonate whiskers is increased, which contributes greatly to the strength and toughness of the product, and can be used t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08
Inventor 周敬红赵剑锋林鹏强王双飞
Owner GUANGXI UNIV
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