Hydrotalcite and its production method

A manufacturing method and technology of hydrotalcite, applied in the direction of hydrotalcite, chemical instruments and methods, aluminum compounds, etc., can solve problems such as insufficient quality of synthetic products, and achieve the effect of improving transparency

Active Publication Date: 2016-06-01
SAKAI CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various methods for synthesizing hydrotalcite are known, but the usual synthetic products may not be sufficient in quality depending on the application

Method used

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  • Hydrotalcite and its production method
  • Hydrotalcite and its production method
  • Hydrotalcite and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] (Example 1) Production of Hydrotalcite

[0132] In a 5 L container, 447.3 g of magnesium hydroxide (D50=4.0 μm) and 299.2 g of aluminum hydroxide (D50=8.0 μm) were added, water was added to make the total amount 3 L, and a slurry was prepared by stirring for 10 minutes. D50 of this slurry was 10 micrometers, and D90 was 75 micrometers. This slurry was supplied to a wet pulverization device equipped with a cooling unit (DynoMill MULTILAB, manufactured by SHINMARU ENTERPRISES CORPORATION, filled with zirconia beads), and the temperature of the slurry was controlled not to exceed 40°C during pulverization, and wet pulverization treatment was performed for 18 minutes (residence time). As a result, D50 of the slurry was 1.0 μm, D90 was 3.5 μm, and the viscosity of the slurry was 5000 mPa·s. Thereafter, sodium bicarbonate was added to 2 L of the pulverized slurry so as to make it 1 / 2 mole relative to 1 mole of magnesium hydroxide, and the whole was adjusted to 8 L with water...

Embodiment 2

[0133] (Example 2) Manufacture of Hydrotalcite

[0134]In a 5 L container, 447.3 g of magnesium hydroxide (D50=4.0 μm) and 299.2 g of aluminum hydroxide (D50=8.0 μm) were added, water was added to make the total amount 3 L, and a slurry was prepared by stirring for 10 minutes. D50 of this slurry was 10 micrometers, and D90 was 75 micrometers. This slurry was supplied to a wet pulverization device equipped with a cooling unit (DynoMill MULTILAB, manufactured by SHINMARU ENTERPRISES CORPORATION, filled with zirconia beads), and the temperature of the slurry was controlled not to exceed 50°C during pulverization, and wet pulverization treatment was performed for 18 minutes (residence time). As a result, D50 of the slurry was 1.0 μm, D90 was 3.5 μm, and the viscosity of the slurry was 4800 mPa·s. Thereafter, sodium bicarbonate was added to 2 L of the pulverized slurry so as to make it 1 / 2 mole relative to 1 mole of magnesium hydroxide, and the whole was adjusted to 8 L with water...

Embodiment 3

[0142] (Example 3) Production of Hydrotalcite

[0143] In a 5 L container, 447.3 g of magnesium hydroxide (D50=4.0 μm) and 299.2 g of aluminum hydroxide (D50=8.0 μm) were added, water was added to make the total amount 3 L, and a slurry was prepared by stirring for 10 minutes. D50 of this slurry was 10 micrometers, and D90 was 75 micrometers. This slurry was supplied to a wet pulverization device equipped with a cooling unit (DynoMill MULTILAB, manufactured by SHINMARU ENTERPRISES CORPORATION, filled with zirconia beads), and the temperature of the slurry was controlled not to exceed 40°C during pulverization, and wet pulverization treatment was performed for 18 minutes (residence time). As a result, D50 of the slurry was 1.0 μm, D90 was 3.5 μm, and the viscosity of the slurry was 5000 mPa·s. Thereafter, sodium carbonate was added to 2 L of the pulverized slurry so as to make it 1 / 2 mole relative to 1 mole of magnesium hydroxide, and the whole was adjusted to 8 L with water, ...

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Abstract

The present invention provides a method for producing hydrotalcite, wherein the obtained hydrotalcite has a low content of zirconia, and when the hydrotalcite is mixed with a resin such as polyvinyl chloride resin, the transparency of the resin is significantly improved. improve. The present invention relates to a method for producing hydrotalcite, which is a method for producing hydrotalcite using magnesium compounds and / or zinc compounds and aluminum compounds as raw materials. Slurry of all or part of at least one selected from the group consisting of hydroxides, oxides, and carbonates of the aforementioned raw materials; wet pulverization process using zirconia beads or zirconia-silica beads , wet pulverization of the slurry under specified conditions; hydrothermal treatment process, after adding the remaining raw materials to the obtained slurry, perform hydrothermal treatment to synthesize hydrotalcite with BET value and Zr content within the specified range .

Description

technical field [0001] The present invention relates to hydrotalcites and methods for their manufacture. Background technique [0002] Hydrotalcite is a general formula [M 2+ 1-x m 3+ x (OH) 2 ][A n- x / n mH 2 O](where, M 2+ Indicates divalent metal ion, M 3+ Indicates a trivalent metal ion, A n- x / n Indicates an interlayer anion. In addition, 0<x<1, n is the valence of A, and 0≤m<1. ) is one of the compounds that are used as catalysts, pharmaceuticals, additives for resins, etc. [0003] Although hydrotalcite can be produced naturally, the output is small, so synthetic products are mainly used. Various methods for synthesizing hydrotalcite are known, but the usual synthetic products may be insufficient in quality depending on the application. For example, hydrotalcite having a relatively large particle size is ideal for use as a resin additive. As the raw material of hydrotalcite, divalent metal salt (magnesium compound, zinc compound, etc.) and triv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/00C01F7/785
CPCC01P2002/72C01P2004/51C01P2006/12C01P2006/22C01P2002/22C01P2006/80C09C1/40C01F7/785
Inventor 信贵庸克津田耕市大西尚美
Owner SAKAI CHEM IND CO LTD
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