Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Foamed ceramic microsphere of core-shell structure and preparation method and application thereof

A foamed ceramic and core-shell structure technology, applied in the field of ceramic materials, can solve the problems of low porosity, insufficient foaming, limited preparation method, etc., and achieve the effects of good sound absorption, complete reaction, controllable and consistent growth

Active Publication Date: 2016-10-12
陈虹
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduced bubbles are inherently thermodynamically unstable systems, which tend to undergo rapid polymerization and disproportionation of the bubbles due to the very high interfacial energy at the gas-liquid interface.
Therefore, this process is difficult to obtain a relatively stable liquid ceramic foam slurry
[0007] (2) Protein foaming method to prepare foam ceramics, protein foaming method also has certain limitations, especially when the solid phase content of foam ceramic powder is high or low
When the solid phase content is high, the viscosity of the ceramic slurry is high, the rheology is poor, and the uniformity of the microstructure of the sample after molding is poor. At the same time, due to the lack of moisture, the foaming process is restricted, resulting in insufficient foaming. The porosity is low; when the solid phase content is low, the foaming is more intense, the sample has a higher porosity, the volume shrinkage is larger when drying, and the sample is easy to crack
[0008] At present, all the basic designs are based on adding other auxiliary foaming substances to the ceramic slurry. The products produced by these methods are large in size and have no microsphere structure, resulting in very limited practical applications.
Due to limited preparation methods, the existing closed-cell foamed ceramics have low porosity, small specific surface area, and large volume, which affect their heat insulation effect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Foamed ceramic microsphere of core-shell structure and preparation method and application thereof
  • Foamed ceramic microsphere of core-shell structure and preparation method and application thereof
  • Foamed ceramic microsphere of core-shell structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] The preparation method of foamed ceramic microspheres with a core-shell structure of the present invention: comprising silica sol configuration, silica sol gelation, preparation of silicic acid xerogel microspheres, water washing-surface aging treatment, re-washing and drying, and high-temperature foaming processes , the specific preparation steps are as follows:

[0055] (a) Silica sol configuration: mix sodium metasilicate solution with styrene copolymer to obtain a mixed solution, heat and pressurize; in the reaction process, it is carried out in four stages: the first stage, dilute hydrochloric acid is passed through the hollow In the second stage, when the diameter of the sol particles in the first stage grows to be greater than 30nm, continue to dilute Hydrochloric acid is poured / dropped into the mixed solution through a hollow quartz capillary, and organic platinum is added again to control the pH value of the mixed solution to 9-10; in the third stage, when the ...

Embodiment 1

[0065] (a) Preparation of raw and auxiliary materials:

[0066] The configuration of dilute hydrochloric acid: water, concentrated hydrochloric acid are dropped into the batching tank in proportion to be made into the dilute hydrochloric acid solution of 5% (mass fraction), standby;

[0067] The configuration of the mixed solution: Put the big bag of solid sodium metasilicate (modulus 3.2) into the dissolution kettle, and at a temperature of 120°C, mix it with water to form a 40% (mass fraction) sodium metasilicate aqueous solution, and then add the solid metasilicate The foaming agent styrene-maleic anhydride copolymer with 8% mass of sodium silicate is configured as a mixed solution.

[0068] Silica sol configuration: Put the mixed solution prepared in the previous step into a high-pressure reactor with a pressure of 3 atmospheres, heat the mixed solution to 120°C, and then carry out the reaction in four stages: In the first stage, pass dilute hydrochloric acid through the i...

Embodiment 2

[0075] (a) configuration of dilute hydrochloric acid: water and concentrated hydrochloric acid are dropped into the batching tank in proportion to be made into 10% (mass fraction) dilute hydrochloric acid solution, for subsequent use;

[0076] The configuration of the mixed solution: Put the big bag of solid sodium metasilicate (modulus 2.7) into the dissolution kettle, and at a temperature of 120°C, mix it with water to form a 25% (mass fraction) sodium metasilicate aqueous solution, and then add the solid metasilicate Sodium silicate 5% mass % styrene-maleic anhydride copolymer is configured as a mixed solution.

[0077] Silica sol configuration: put the mixed solution prepared in the previous step into a high-pressure reaction kettle with 4 atmospheres, heat the mixed solution to 100°C, and then carry out the reaction in four stages: the first stage, pass dilute hydrochloric acid through the inner space A quartz capillary with a diameter of 500nm is poured / dropped into the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a foamed ceramic microsphere of a core-shell structure. The method comprises the steps of silica sol preparation, silica sol gelation, preparation of a silicic acid xerogel microsphere, washing-surface aging treatment, secondary washing and drying and high-temperature foaming. The foamed ceramic microsphere of the core-shell structure has the grain diameter of 0.3-5 mm and is of an inner-outer layered structure, a ceramic hermetic shell with the diameter of 45-55 micrometers is arranged on the outer layer of the microsphere, polygonal aggregates are composed of micron-grade particles on the surface of the ceramic hermetic shell, the interval of every two adjacent polygonal aggregates is 0.8-1.2 micrometers, holes with the diameter of 80-120 nm are distributed in the intervals, a plurality of capillary channels are distributed in the holes, the micron-grade particles are used as a base core, nano particles are deposited on the surfaces of the micron-grade particles, and the specific area of the microsphere of the particles with nano particles deposited is larger than that of a smooth microsphere with the same diameter by 3-4 orders of magnitude; the interior of the microsphere is of a three-dimensional cut-through net micropore structure, and hermetic balls with the diameter of 0.2-0.5 micrometers are distributed in the micropores.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a foamed ceramic microsphere with a core-shell structure and a preparation method and application thereof. Background technique [0002] In the wave of global economic development and the rapid development of world industry, the environment and resources are the major problems encountered by human society. The requirements for saving resources and protecting the environment are getting higher and higher. Therefore, materials that adapt to this situation are It is very important and has positive significance to the development of society. Closed-cell foam ceramics is a new material that meets the development requirements of this situation. It can play a significant role in improving efficiency, saving resources, and protecting the ecological environment. [0003] Foam ceramics is a kind of foam-like porous ceramics in shape. It is the third generation of por...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/19C04B35/624C04B38/10C02F3/00B01J32/00B01J23/04B01J35/10
CPCC02F3/00C04B35/19C04B35/624C04B38/0061C04B38/10B01J23/002B01J23/04C04B2235/96C04B2235/9607C04B2235/77B01J2523/00B01J35/60B01J2523/12B01J2523/31B01J2523/41
Inventor 陈虹
Owner 陈虹
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products