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Hollow multi-shell core-shell material, preparation method thereof and explosion-proof polyurea

A shell and hollow technology, applied in the field of coatings, can solve the problems of difficult polyurea spraying, poor dispersibility, and decreased coating strength.

Active Publication Date: 2022-07-15
QINGDAO AIR NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The physical blending method of the former has poor dispersibility, and it is difficult to spray polyurea after adding fillers, and if too much filler is added, the material will easily cause the filler to separate from the resin under high-speed impact, which is manifested by a sharp drop in the strength of the coating film under high-speed impact; the latter Although increasing the hard segment content of the resin increases the strength of the material, its hardness is also greatly increased, resulting in the deterioration of the low-temperature flexibility of the material, and the material loses the effect of anti-ballistic and explosion-proof in low-temperature environments

Method used

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  • Hollow multi-shell core-shell material, preparation method thereof and explosion-proof polyurea
  • Hollow multi-shell core-shell material, preparation method thereof and explosion-proof polyurea
  • Hollow multi-shell core-shell material, preparation method thereof and explosion-proof polyurea

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preparation example Construction

[0031] The present invention provides the preparation method of the hollow multi-shell core-shell material described in the above technical solution, comprising the following steps:

[0032] 2-methylimidazole is esterified with citric acid to obtain imidazole ester;

[0033] Mixing the imidazolate with soluble zinc salt and soluble nickel salt for loading to obtain zinc-nickel@imidazolate composite microspheres;

[0034] drying the zinc-nickel@imidazolate composite microspheres to obtain zinc-nickel bimetallic powder;

[0035] Heat treatment of the zinc-nickel bimetallic powder in air to obtain hollow multi-shell zinc-nickel oxide microspheres;

[0036] The hollow multi-shell layer zinc-nickel oxide microspheres are dispersed in a ferrous salt aqueous solution to undergo in-situ oxidation and hydrolysis reactions to obtain the hollow multi-shell layer core-shell material.

[0037] In the present invention, 2-methylimidazole is esterified with citric acid to obtain imidazole ...

Embodiment 1

[0085] Preparation of hollow multi-shell zinc-nickel oxide microspheres: ultrasonically dissolve 10 parts of 2-methylimidazole in 100 parts of methanol, add 10 parts of citric acid dropwise, and react with magnetic stirring at room temperature for 2 hours to obtain imidazolate, and continue to add 5 parts of nickel nitrate and 5 parts of zinc nitrate were magnetically stirred at room temperature for 12 hours, and allowed to stand at room temperature for 12 hours. The precipitate was collected by centrifugation, washed three times with methanol to obtain zinc-nickel@imidazolate composite microspheres, and then dried in a vacuum drying oven at 60 °C for 12 h to obtain zinc-nickel bimetallic powder. The above zinc-nickel bimetallic powder was placed in an alumina sintering boat, transferred to a tube furnace and raised to 600°C at a heating rate of 5°C / min, kept in air for 2 hours, and naturally cooled to obtain a hollow multi-shell layer of zinc-nickel oxidation. microspheres. ...

Embodiment 2

[0092] Preparation of hollow multi-shell zinc-nickel oxide microspheres: Dissolve 20 parts of 2-methylimidazole in 100 parts of methanol by ultrasonic, add 20 parts of citric acid dropwise, and react with magnetic stirring at room temperature for 2 hours to obtain imidazolate, and continue to add 8 parts of nickel nitrate and 8 parts of zinc nitrate were magnetically stirred at room temperature for 12 hours, and allowed to stand at room temperature for 12 hours. The precipitate was collected by centrifugation, washed three times with methanol to obtain zinc-nickel@imidazolate composite microspheres, and then dried in a vacuum drying oven at 60 °C for 12 h to obtain zinc-nickel bimetallic powder. The above zinc-nickel bimetallic powder was placed in an alumina sintering boat, transferred to a tube furnace and raised to 600°C at a heating rate of 5°C / min, kept in air for 2 hours, and naturally cooled to obtain a hollow multi-shell layer of zinc-nickel oxidation. microspheres.

...

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Abstract

The invention provides a hollow multi-shell core-shell material. The hollow multi-shell core-shell material comprises hollow multi-shell zinc-nickel oxide microspheres and iron oxyhydroxide nanowires located on the surfaces of the hollow multi-shell zinc-nickel oxide microspheres. According to the invention, the multi-stage shell structure has a good buffering effect on stress, has higher rigidity and strength in a hollow structure material under a micron scale, can bear higher load stress, and also can play a role in transmitting force when a composite material sample is subjected to external force, so that crazing and deformation are generated, and the performance of the composite material sample is improved. And a part of energy in the acting force process is absorbed to prevent generation and expansion of destructive cracks, and finally the aims of toughening and enhancing the mechanical property of the composite material are achieved. The growth of the iron oxyhydroxide nanowires avoids agglomeration of the metal oxide microspheres with hollow structures, and in addition, the iron oxyhydroxide can react with active groups of polyurea, so that the performance of the composite material is improved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a hollow multi-shell core-shell material, a preparation method thereof, and an explosion-proof polyurea. Background technique [0002] Because of its solvent-free environmental protection, high mechanical strength and fast construction, spray polyurea materials are widely used in submarine pipelines, buried pipelines anticorrosion, storage tank anticorrosion, concrete protection, waterproofing, military skin, chassis protection and other fields. To apply it to the field of military bullet-proof and explosion-proof protection materials, in addition to the need for the coating itself to have ultra-high physical strength, it is also required to show good tear resistance under high-speed impact, but conventional polyurea products are difficult to achieve above. Require. [0003] Polyurea has many formulations and wide application fields. According to its use, different formulations...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/62C09D7/61C09D175/02B01J13/02
CPCC09D7/62C09D7/61C09D175/02C09D7/70B01J13/02C08K2201/011C08K7/24C08K9/02C08K7/08Y02E60/10
Inventor 王宝柱李永岗苏坤王昊翔张天华刘丽媛
Owner QINGDAO AIR NEW MATERIALS
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