A kind of layered mineral and nano-carbonyl iron intercalation composite material and preparation method thereof

A layered mineral and composite material technology, applied in carbonyl iron, chemical instruments and methods, silicon compounds, etc., can solve the problems of difficult particle size control, high price, high specific gravity, and achieve excellent electromagnetic loss performance, wide absorption bandwidth, Widely Useful Effects

Inactive Publication Date: 2016-02-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High price, high specific gravity and difficult to control the particle size are the main obstacles for the practical application of carbonyl iron powder in the field of microwave absorbing materials

Method used

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The preparation method steps of layered mineral and nano carbonyl iron intercalation composite material are as follows:

[0017] 1) After separation and purification of layered minerals, add 5 to 10 times the weight of hydrochloric acid with a concentration of 3% to 10%, and then add sodium dithionite equivalent to 0.5% to 2% of the weight of layered minerals and stir evenly to make a suspension slurry , react at room temperature for 6 to 24 hours, stirring continuously during this period;

[0018] It is recommended to use hydrochloric acid in consideration of factors such as cost and effect, and other inorganic acids can also be used. On the one hand, acid treatment can remove possible acid-soluble impurities, such as carbonates, iron-manganese oxides, and sulfides; in addition, acid treatment can activate the mineral surface, which is conducive to subsequent intercalation. Adding sodium dithionite can reduce iron and manganese and increase their removal rate.

[001...

Embodiment 1

[0030] 1) After separation and purification of talc, add 10 times the weight of hydrochloric acid with a concentration of 3%, then add sodium hydrosulfite equivalent to 0.5% of the weight of talc, stir evenly to make a suspension slurry, react at room temperature for 6 hours, and keep stirring during the period ;

[0031] 2) Filter or centrifugal dehydration, wash twice, and dry at 60°C;

[0032] 3) After cooling to room temperature, add 0.8 parts of Fe(CO)5 to each part of talc, stir well and grind in a ball mill for 1 hour;

[0033] 4) The material is isolated from the air and heated to 150°C, and the temperature is maintained for 3 hours. The obtained product is talc and nano carbonyl iron intercalation composite material.

Embodiment 2

[0035] 1) After separation and purification of sericite, add 5 times the weight of hydrochloric acid with a concentration of 10%, and then add sodium dithionite equivalent to 2% of the weight of sericite, stir evenly to make a suspension slurry, and react at room temperature for 24 hours. keep stirring;

[0036] 2) Filtration or centrifugal dehydration, washing 4 times, drying at 80°C;

[0037] 3) After cooling to room temperature, add 1.5 parts of Fe(CO)5 to each part of sericite, stir well and grind in a ball mill for 2 hours;

[0038] 4) The material is isolated from the air and heated to 300°C, and kept at a constant temperature for 0.5 hours. The obtained product is sericite and nano carbonyl iron intercalation composite material.

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Abstract

The invention discloses a layered mineral and nano-carbonyl iron intercalation composite material and a preparation method thereof. It is a composite material formed by inserting nano-sized carbonyl iron particles between the crystal structure layers of minerals. The preparation method steps are as follows: 1) Use inorganic acid and reducing agent to activate and remove the layered minerals; 2) Dehydrate and dry the layered minerals after acid activation; 3) Grind the layered minerals together with Fe(CO)5 to form intercalated layer compound; 4) heating to dehydrate Fe(CO)5 in the interlayer to form nano-carbonyl iron particles. The obtained product is layered mineral and nano-carbonyl iron intercalation composite material. The invention successfully intercalates nano-carbonyl iron particles into silicate minerals, effectively inhibits the agglomeration of nano-particles by using its interlayer binding force, and the prepared product has excellent electromagnetic wave loss performance, and can be used as a wave absorber for various equipment coating.

Description

technical field [0001] The invention relates to a layered mineral and nano-carbonyl iron intercalation composite material and a preparation method thereof. Background technique [0002] Carbonyl iron powder has excellent electromagnetic wave loss performance and can be used as a wave-absorbing coating for various equipment. The preparation of carbonyl iron powder is the oily Fe(CO) 5 The liquid is sprayed and pyrolyzed under air-isolated conditions, and the particle size of the resulting product is difficult to control, usually micron-sized particles. High price, high specific gravity, and difficulty in controlling the particle size are the main obstacles to the practical application of carbonyl iron powder in the field of microwave-absorbing materials. Contents of the invention [0003] The invention provides a layered mineral and nano-carbonyl iron intercalation composite material and a preparation method thereof. The layered mineral and nano-carbonyl iron intercalati...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B33/38C01G49/16
Inventor叶瑛秦文莉陈雪刚纪晓声李林蔚夏枚生闫康康
OwnerZHEJIANG UNIV