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Preparation method of superfine modified kaolin

A kaolin and modification technology, which is applied in the fields of ultra-fine modified kaolin, preparation of ultra-fine modified kaolin, rubber and plastic materials and oil-based coatings, and can solve the problems of easily damaged kaolin crystal structure, low intercalation rate, poor control, etc. problem, to achieve the effect of good peeling effect, strong control and low cost

Active Publication Date: 2014-08-20
中国高岭土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ultrafine modified kaolin, which mainly solves the problems of poor control, easy damage to the crystal structure of kaolin, low intercalation rate, ultrafine treatment and Modification to deal with the problem of phase separation

Method used

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  • Preparation method of superfine modified kaolin
  • Preparation method of superfine modified kaolin
  • Preparation method of superfine modified kaolin

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: A kind of preparation method of superfine modified kaolin

[0028] Consists of the following steps in turn:

[0029] The first step is to weigh 50g of kaolin powder (brand name RF0) and 50g of urea from China Kaolin Co., Ltd. respectively, and then mix the two evenly in a non-airtight vortex mixer to obtain a mixture. After the mixture fully absorbs the moisture in the air reserve;

[0030] In the second step, the mixture prepared in the first step is heated in a closed environment, and the mixture is reacted at 120° C. for 48 hours, so that the urea molecules are inserted between the kaolin sheets to obtain a kaolin-urea intercalation complex, The intercalation rate reaches 98%. According to attached figure 1 And attached figure 2 According to the X-ray diffraction pattern shown, the kaolin 001 plane diffraction peak 2θ≈12.30o without intercalation, and the interlayer distance d001=0.74nm. When urea is intercalated, its 001 plane diffraction peak sh...

Embodiment 2

[0042] Embodiment 2: A kind of preparation method of superfine modified kaolin

[0043] The first step is to weigh 70g of kaolin powder (brand RF0) and 30g of urea from China Kaolin Clay Co., Ltd. respectively, and then mix the two evenly in a non-airtight vortex mixer to obtain a mixture. After the mixture fully absorbs the moisture in the air reserve;

[0044] In the second step, the mixture prepared in the first step is heated in a closed environment, and the mixture is reacted at 100° C. for 24 hours, so that the urea molecules are inserted between the kaolin sheets to obtain a kaolin-urea intercalation complex, The intercalation rate reaches 88%; according to the attached image 3 As shown, the diffraction peak of kaolin 001 plane without intercalation is 2θ≈12.30o, and the interlayer distance d001=0.74nm. When urea is intercalated, its 001 plane diffraction peak shifts to a small angle to 2θ≈8.24o, and the interlayer distance d001=1.06nm. The increase of interlayer sp...

Embodiment 3

[0051] Embodiment 3: A kind of preparation method of superfine modified kaolin

[0052] Consists of the following steps in turn:

[0053] The first step is to weigh 90g of kaolin powder (brand name RF0) and 10g of urea from China Kaolin Clay Co., Ltd., and then mix the two evenly in a non-airtight vortex mixer to obtain a mixture. After the mixture fully absorbs the moisture in the air reserve;

[0054] In the second step, the mixture prepared in the first step is heated in a closed environment, and the mixture is reacted at 70° C. for 12 hours, so that urea molecules are inserted between the kaolin sheets to obtain a kaolin-urea intercalation complex, The intercalation rate reached 81%; according to the attached Figure 4 As shown, the diffraction peak of kaolin 001 plane without intercalation is 2θ≈12.30o, and the interlayer distance d001=0.74nm. When urea is intercalated, its 001 plane diffraction peak shifts to a small angle to 2θ≈8.18o, and the interlayer distance d001...

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Abstract

The invention relates to a preparation method of superfine modified kaolin, which is characterized in that the preparation method comprises the following steps that (1), kaolin powder and carbamide are uniformly mixed in an open container, and fully absorb moisture in air to form a mixture; (2), the mixture is heated, and reacts at 70-120 DEG C; a kaolin-carbamide intercalation compound is prepared; an intercalation rate is 80%-98%; (3), the compound is placed into a ball mill; a certain amount of dispersing agent and water is added; wet grinding is conducted; the content of ground kaolin with a particle size less than 2 micrometers is above 90%; a kaolin mud cake is obtained through suction filtration and dehydration; (4) a certain amount of silane coupling agent and water is added into the kaolin mud cake, and stirred at 50-80 DEG C; a coupling reaction happens; the modification is achieved; and (5) the modified kaolin is dried, and the finished superfine modified kaolin is prepared. According to the preparation method, the intercalation rate is high; the influence on a crystal structure of the kaolin is small; a peeling effect is good; and the prepared superfine modified kaolin is particularly applicable to rubber and plastic materials and oil paint.

Description

technical field [0001] The invention relates to the field of superfine kaolin and surface modification, in particular to a preparation method of superfine modified kaolin. The superfine modified kaolin prepared by the preparation method is especially suitable for rubber and plastic materials and oil paints. Background technique [0002] Kaolin is an important non-metallic mineral, widely used in paints, coatings, paper, rubber, plastics, cables, ceramics, enamel, refractory materials, textiles, cement, automobiles, chemicals, environmental protection, agriculture and other fields. [0003] The main component of kaolin is kaolinite, and its crystal structure is characterized by: the unit layer structure is composed of two layers, a layer of -Si-O-tetrahedron and a layer of -Al-(O,OH)-octahedron connected. become. The kaolin unit crystal layer has an OH layer on one side and an O layer on the other side, and the -OH bond has strong polarity. Hydrogen bonds are easily formed b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/44
Inventor 李青陈丽昆张忠飞冯杰申益兰陆慧张飞文斐邓毅超
Owner 中国高岭土有限公司
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