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Preparation method of nano calcium carbonate

A technology of nano-calcium carbonate and calcium carbonate, which is applied in the field of calcium carbonate, can solve the problems of poor purity of nano-calcium carbonate, achieve good dispersion, uniform distribution, and reduce process costs

Pending Publication Date: 2021-01-26
吴亚良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art, the present invention provides a method for preparing nano-calcium carbonate, which solves the problem of poor purity of nano-calcium carbonate in the prior art, and utilizes the difference in solubility between calcium hydroxide and calcium carbonate to form calcium hydroxide to dissolve And the change process of transformation, the distribution of nano calcium carbonate particles is uniform, the dispersion is good, and there is no agglomeration phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of nano-calcium carbonate, comprising the steps of:

[0015] Step 1, stir 20g of calcium hydroxide and 60g of ethyl cellulose powder evenly to form 80g of mixed powder; add 80g of mixed powder to 90g of absolute ethanol to form a viscous slurry at a stirring speed of 1000r / min, At a spinning voltage of 15kV and a temperature of 80°C, spin at an injection speed of 1.1mL / h to obtain a fiber monofilament with a diameter of 100nm, use 3 strands of fiber monofilament as a braided monofilament, and weave it as a warp and weft to form a 10cm *10cm non-woven fabric;

[0016] Step 2, mix 100mL dichloroethane and 50mL distilled water to form a layered liquid, and add it to the reaction kettle; stack the non-woven fabrics to a height of 30cm, and place them on the hollow plate in the reaction kettle, while the non-woven fabric part Soak in distilled water; slowly introduce carbon dioxide at a rate of 5mL / min, and slowly lower the hollow plate until it is comp...

Embodiment 2

[0020] A preparation method of nano-calcium carbonate, comprising the steps of:

[0021] Step 1, stir 70g of calcium hydroxide and 60g of ethyl cellulose powder evenly to form 130g of mixed powder; add 130g of mixed powder to 120g of absolute ethanol to form a viscous slurry at a stirring speed of 2000r / min, At a spinning voltage of 15kV and a temperature of 100°C, spin at an injection speed of 1.5mL / h to obtain a fiber monofilament with a diameter of 800nm, use 10 strands of fiber monofilament as a braided monofilament, and weave it as a warp and weft to form a 10cm *10cm non-woven fabric;

[0022] Step 2, mix 80mL dichloroethane and 80mL distilled water to form a layered liquid, and add it to the reaction kettle; stack the non-woven fabrics to a height of 20cm, and place them on the hollow plate in the reaction kettle, while the non-woven fabric part Soak in distilled water; slowly introduce carbon dioxide at a rate of 10mL / min, and slowly lower the hollow plate until it is...

Embodiment 3

[0026] A preparation method of nano-calcium carbonate, comprising the steps of:

[0027] Step 1, stir 50g of calcium hydroxide and 60g of ethyl cellulose powder evenly to form 110g of mixed powder; add 110g of mixed powder to 108g of absolute ethanol to form a viscous slurry at a stirring speed of 1500r / min, At a spinning voltage of 15kV and a temperature of 90°C, spin at an injection speed of 1.3mL / h to obtain a fiber monofilament with a diameter of 400nm, and use 3 strands of fiber monofilament as a braided monofilament, and weave it as a warp and weft to form a 10cm *10cm non-woven fabric;

[0028] Step 2, mix 120mL dichloroethane and 40mL distilled water to form a layered liquid, and add it to the reaction kettle; stack the non-woven fabric to a height of 10cm, and place it on the hollow plate in the reaction kettle, while the non-woven fabric part Soak in distilled water; slowly introduce carbon dioxide at a rate of 8mL / min, and slowly lower the hollow plate until it is ...

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Abstract

The invention belongs to the field of calcium carbonate, and particularly relates to a preparation method of nano calcium carbonate, which comprises the following steps: 1. Uniformly stirring calciumhydroxide powder and ethyl cellulose powder to form mixed powder, adding anhydrous ethanol, uniformly stirring to form viscous slurry, carrying out high-temperature spinning to form monofilament fibers, and weaving into a non-woven fabric; step 2, stacking non-woven fabric on a hollow plate in the middle section of the reaction kettle, soaking the non-woven fabric in the layering liquid, slowly introducing carbon dioxide gas until no precipitate is generated in the layering liquid, then removing the non-woven fabric, and filtering the layering liquid to obtain calcium carbonate precipitate; and step 3, adding the calcium carbonate precipitate into absolute ethyl alcohol, carrying out ultrasonic dispersion for 20-40 minutes, and carrying out spray sedimentation to obtain the nano calcium carbonate. According to the invention, the change process of dissolution and conversion of calcium hydroxide is utilized to obtain the nano calcium carbonate with uniform particle distribution, good dispersibility and no agglomeration phenomenon.

Description

technical field [0001] The invention belongs to the field of calcium carbonate, and in particular relates to a preparation method of nanometer calcium carbonate. Background technique [0002] As one of the main functional filling materials of PVC plastisol, nano-calcium carbonate can endow PVC plastisol with considerable thixotropy, which plays an indispensable role in improving tensile strength, elongation at break and yield stress. The particle morphology, particle size distribution and dispersion of nano-calcium carbonate have a great influence on the rheological properties of PVC plastisol. The current preparation method of nano-calcium carbonate is relatively complicated, and a large amount of additives need to be added in the process. These additives are doped on calcium carbonate, resulting in a decrease in the purity of calcium carbonate. Contents of the invention [0003] Aiming at the problems in the prior art, the present invention provides a preparation method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCC01F11/183B82Y30/00B82Y40/00C01P2004/64C01P2006/80Y02P20/141
Inventor 吴亚良李婷
Owner 吴亚良
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