Nanometer kaolinite powder and preparing method thereof

A technology of nano-kaolin and powder, which is applied in the direction of chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of no nano-clay powder, no nano-clay powder, etc., and achieve good gloss and sensory properties , highly dispersible and suspending properties, a wide range of effects

Inactive Publication Date: 2004-07-07
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, the current method of using interlayer polymerization or exfoliation actually makes clay nanometerized during the polymerization of organic compounds. It is a compos

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Choose to use the fine-grained soft kaolin formed in the lake environment as raw material, and its natural whiteness is 79%; first add 2000 ml of water to the fine-grained soft kaolin raw material of 500g weight and stir, add 1 gram of sodium hexametaphosphate at the same time to disperse agent, the stirring speed is 800 rpm, and the stirring time is 10 minutes to make a slurry with a concentration of 20%; then pass through a high gradient magnetic separator with a magnetic field strength of 2 Tesla, and the magnetization time is 120 seconds; then add the concentration Adjust the pH value of the mud to 2 with 30% sulfuric acid, while stirring at a speed of 300 rpm, add sodium dithionite in an amount of 0.05% of the clay weight, and add sodium aminocarboxylate in an amount of clay 2% by weight, reacted for 50 minutes, stirred constantly during the reaction, and the stirring speed was 300 rpm. After the reaction, filter and dehydrate on a vacuum filter, add 20 times of wa...

Embodiment 2

[0041] Select 20 kilograms of 325 mesh flint clay raw materials, and its natural whiteness is 73%. Add water to the mixing tank to make a 50% concentration slurry, add 100 grams (0.5% clay weight) polyacryloyl sodium dispersant, stir constantly, the stirring speed is 600 rpm, and use a general-purpose grinding and peeling machine to peel off the raw materials , grinding time 1 hour. Add water to the 50% concentration mud after stripping to make 25% concentration slurry, stir continuously at a speed of 1000 rpm, and the stirring time is 20 minutes; Choose the machine, and the magnetization time is 240 seconds; Adding concentration then is that the pH value of the citric acid adjustment mud of 35% is 4.5, then first adds 300 grams (1.5% clay weight) sodium sulfite reducing agent, adds 400 grams after 25 minutes (2 % clay weight) of sodium tripolyphosphate chelating agent, and constantly stirring, the stirring speed can be controlled at 300 rev / min, to avoid strong stirring to p...

Embodiment 3

[0043] Choose soft kaolin as raw material, its natural whiteness is 75%. First add 0.3% sodium tripolyphosphate dispersant to 3 kg of kaolin raw material, add water, stir, the stirring speed is 500 rpm, and the stirring time is 40 minutes to make a 15% concentration of mud; Be the high gradient magnetic separator of 1.8 tesla, the magnetization time is 1.5 minutes; Then add the oxalic acid of 40% concentration to adjust the pH value of mud to be 3, then first add the dithionous acid of 15 grams (0.5% clay weight) Zinc reducing agent, add the acetic acid chelating agent of 30 grams (1% clay weight) after 10 minutes, and constantly stir, stirring speed is 800 rev / mins, avoids strong stirring and produces too many bubbles. After reacting for 150 minutes, it was dehydrated, filtered and washed with water until pH = 7.2. Then the filter cake is made into 50% mud again, and then 0.2% zinc stearate, 1.5% isopropyl trimethacryloyl titanate and 0.3% 3-mercaptopropyl trimethoxysilane a...

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Abstract

A nano-class kaolinite powder with 0.3-0.9 g/cu.m of bulk density and 400-800 nm of average diameter is prepared from the natural fine-particle kaolinite through removing impurities (Fe, Ti, etc) by magnetic separation and chemical reduction, and unique surface treating to prevent aggregation. It can be used for rubber, plastics, paper, ink and ceramics.

Description

technical field [0001] The invention relates to a highly dispersed clay mineral, in particular to a nano kaolin powder and a preparation method thereof. Background technique [0002] Kaolin is an important non-metallic mineral raw material. It is widely used in ceramics, papermaking, rubber, plastics, coatings, catalysts, inks and other industrial fields due to its abundant raw materials and low price. Kaolin is mainly composed of kaolinite mineral, which is a kind of hydrous layered silicate mineral, and its structure is formed by a layer of silicon-oxygen tetrahedron and aluminum-oxygen octahedron alternating vertically. [0003] At present, the development and application of kaolin is developing in the direction of high whiteness, ultra-fine, and organic compound modification. The ultra-fine technology of kaolin mainly includes dry ultra-fine grinding and wet flake method. Dry superfine pulverization mainly adopts the principle of mechanical impact or powder particle...

Claims

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Application Information

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IPC IPC(8): C09C1/42C09C3/00
Inventor 刘钦甫
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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