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Preparation method of ultrafine silane surface grafted kaolinite powder body

A technology of surface grafting and kaolinite, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as poor surface activity of kaolinite, high energy consumption for heating modification, and poor modification effect. Achieve the effects of fine particle size, good stability, good hydrophobicity and dispersibility

Active Publication Date: 2014-06-18
无锡菲勒高性能材料有限公司
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Problems solved by technology

[0003] In the prior art, the preparation of organically modified kaolinite mainly adopts mechanical pulverization and conventional heating modification. However, mechanical pulverization destroys the flaky structure of kaolinite, and kaolinite has poor surface activity and is difficult to chemically modify. , and the disadvantages of high energy consumption and poor modification effect of conventional heating modification

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  • Preparation method of ultrafine silane surface grafted kaolinite powder body

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the examples, but the content of the present invention is not limited thereto.

[0015] A1, organic small molecule intercalation, mix and stir the purified kaolinite with water to prepare a slurry with a mass concentration of 15%-40%, and add a small molecule intercalation agent acetic acid with a water weight of 10%-30% in the slurry Potassium or urea, etc., react at a certain temperature of 25-65 degrees for 2-48 hours to prepare kaolinite small molecule intercalation complex; A2, ultrasonic peeling, the kaolinite slurry treated by A1 is subjected to ultrasonic peeling treatment , the ultrasonic power is between 200w and 800w, and the ultrasonic time is 30 minutes to 120 minutes; A3, microwave-assisted chemical modification, after ultrasonic stripping, filtering, and then using ethanol as a dispersion medium to prepare a slurry with a solid content of 30-60wt%, Add a silane coupling agent surfac...

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Abstract

The invention discloses a preparation method of ultrafine silane surface grafted kaolinite powder body, which comprises the steps of firstly performing pre-intercalation on kaolinite by using potassium acetate and / or urea; then enabling the intercalated kaolinite lamellas to be peeled off so as to expose the active groups between the kaolinite lamellas through ultrasonic treatment; and lastly performing the surface grafting modification on the kaolinite lamellas newly formed through peeling off with the means of the surface modifier under the microwave-assisted action. The kaolinite powder body material prepared by the invention is small in particle size, has high stability and high hydrophobicity and dispersibility, and the surface is chemically grafted with an organic modifier.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a preparation method of superfine silane surface-grafted kaolinite powder. Background technique [0002] Kaolin is an advantageous mineral resource in my country, with large reserves and wide distribution. Kaolinite, the main constituent mineral of kaolin, has a regular hexagonal sheet stacking structure, and the two bottom surfaces are composed of silicon cation tetrahedron and alumina octahedron respectively. It has the characteristics of surface heterogeneity. It is used in polymer functional fillers, drug carriers, It has attractive application prospects in chemical catalysis and bioelectrodes. The research on the preparation of functional kaolin has been widely concerned at home and abroad. Ultrafine and surface modification are the key to prepare functional kaolin. The superfine treatment of kaolin includes mechanical grinding method and chemical intercalation peeling me...

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Application Information

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IPC IPC(8): C01B33/44
Inventor 张乾陆银平张玉德赵继芬王岩张白梅马爱玲
Owner 无锡菲勒高性能材料有限公司
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