Preparation method of nanometer magnesia coated kaolin composite material

A technology of nano-magnesia and composite materials, which is applied in the field of preparation of nano-magnesia-coated kaolin composite materials, which can solve the problems of increasing the refractive index of kaolin, not being prominent and stable enough, and achieving increased refractive index, enhanced opacity, The effect of a large refractive index

Active Publication Date: 2015-06-03
广东科进应用技术研究有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The combination of magnesium oxide and kaolin materials can solve the defects of kaolin itself. However, the application of magnesium oxide as a coating material on kaolin materials is still relatively small; nowadays, although there are magnesium oxide-coated kaolin composite materials, but Due to the limitations of the preparation method and technical conditions of the existing technology, the advantages of the magnesium oxide-coated kaolin composite material in the paper industry to improve the flame retardant function and increase the kaolin refractive index are not prominent and stable enough, so that the application of the composite material is still there are great limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of a kind of nano magnesium oxide coated kaolin composite material described in this embodiment 1, its preparation steps are:

[0020] (1) Weigh 100g of kaolin, put it into a ball mill and mill it for 30 minutes, sieve the ball-milled powder in a 6250-mesh standard sieve, and weigh 50g of the sifted powder;

[0021] (2) Put 500mL of distilled water into a 1000mL beaker, put the powder weighed in step (1) into 500mL of distilled water and weigh 2g of sodium hexametaphosphate into the solution for ultrasonic dispersion. Add 100g / L of MgCl 2 Solution 50mL, forming a uniform suspension solution;

[0022] (3) Place the beaker in step (2) in a constant temperature water bath and heat to 80°C, stir the suspension solution with a booster electric stirrer at a speed of 600 rpm, and measure 300ml of CO(NH 2 ) 2 solution, gradually put CO(NH 2 ) 2 The solution is added dropwise to the suspension solution until the drop is complete;

[0023] (4) Filter ...

Embodiment 2

[0026] The preparation method of a kind of nano magnesium oxide coated kaolin composite material of this embodiment 2, its preparation steps are:

[0027] (1) Weigh 60g of kaolin, put it into a ball mill and mill it for 30 minutes, sieve the ball-milled powder in a 6250-mesh standard sieve, and weigh 30g of the sifted powder;

[0028] (2) Put 500mL of distilled water into a beaker, put the powder weighed in step (1) into 500mL of distilled water and weigh 1g of sodium hexametaphosphate into the solution, carry out ultrasonic dispersion, add 100g of / L MgCl 2 Solution 30mL, forming a uniform suspension solution;

[0029] (3) Place the beaker in step (2) in a constant temperature water bath and heat to 60°C, stir the suspension solution with a booster electric stirrer at a speed of 600 rpm, and measure 300ml of CO(NH 2 ) 2 solution, gradually put CO(NH 2 ) 2 The solution is added dropwise to the suspension solution until the drop is complete;

[0030] (4) Filter the soluti...

Embodiment 3

[0033] The preparation method of a kind of nano magnesium oxide coated kaolin composite material of this embodiment 3, its preparation steps are:

[0034] (1) Weigh 160g of kaolin, put it into a ball mill and mill it for 30 minutes, sieve the ball-milled powder in a 6250-mesh standard sieve, and weigh 80g of the sifted powder;

[0035] (2) Put 500mL of distilled water into a beaker, put the powder weighed in step (1) into 500mL of distilled water and weigh 4g of sodium hexametaphosphate into the solution, carry out ultrasonic dispersion, add 100g of / L MgCl 2 Solution 100mL, forming a uniform suspension solution;

[0036] (3) Place the beaker in step (2) in a constant temperature water bath and heat to 100°C, stir the suspension solution with a booster electric stirrer at a speed of 600 rpm, and measure 300ml of CO(NH 2 ) 2 solution, gradually put CO(NH 2 ) 2 The solution is added dropwise to the suspension solution until the drop is complete;

[0037] (4) Filter the sol...

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Abstract

The invention discloses a preparation method of a nanometer magnesia coated kaolin composite material. The preparation method comprises the following steps: (1), weighing the kaolin, grinding and screening, to obtain screened powders; (2), putting the powders into distilled water and putting sodium hexametaphosphate into the solution, carrying out ultrasonic dispersing, stirring and adding an MgCl2 solution, to form a uniform suspending solution; (3), heating the suspending solution to be 60-100 DEG C, stirring the suspending solution, and gradually dripping a CO(NH2)2 solution into the suspending solution until dripping off; (4), filtering the solution, washing filter residues by distilled water until no Cl<-> ion is existent in a washing liquid; and (5), drying the washed filter residues in a drying oven to obtain dry powders, and grinding the dry powders, so as to obtain the nanometer magnesia coated kaolin composite material. The composite material prepared by the preparation method has the advantages that the whiteness is as high as 90%, the index of refraction is high, and furthermore, the flame-retardant function of the composite material is enhanced.

Description

technical field [0001] The invention relates to a preparation method of a nano-magnesia-coated kaolin composite material, in particular to a preparation method of a nano-alumina-coated kaolin composite material capable of increasing whiteness, increasing a refractive index, and endowing kaolin with a flame-retardant function. Background technique [0002] Kaolin, also known as white clay or china clay, is the most common white pigment in the paper industry, and its resources are almost all over the world. Kaolin used in the papermaking industry is mainly used in the production and processing of coated paper and coated white board paper, and there are certain requirements for the whiteness, particle size, viscosity, and refractive index of kaolin. my country is rich in kaolin resources, but high-quality kaolin has been in short supply for a long time. Compared with the United Kingdom, the United States and other countries, my country's kaolin enterprises still have the disad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
Inventor 尹荔松黄韶葵
Owner 广东科进应用技术研究有限公司
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