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Graphene/ceramic composite microparticles used for spray molding and preparation method of composite microparticles

A ceramic composite and ceramic particle technology, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problems of environmental pollution, poor fluidity, and difficult to spray particles.

Active Publication Date: 2019-12-03
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can prepare relatively uniformly dispersed graphene composite materials, but this method uses a large number of toxic reagents in the preparation process (acute toxicity of tetraethyl orthosilicate: LD50: 6270mg / kg (rat oral); 6.3ml (5859mg ) / kg (rabbit skin)), will cause pollution to the environment
Moreover, the graphene composite particles prepared by the above two processes are irregular in shape, have a wide range of particle size dispersion, and have poor fluidity, so it is difficult to directly use them as spray particles.
[0005] In view of the fact that none of the traditional preparation methods can prepare graphene composite particles suitable for spray forming, it is necessary to adopt a new process to prepare graphene composite particles

Method used

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  • Graphene/ceramic composite microparticles used for spray molding and preparation method of composite microparticles
  • Graphene/ceramic composite microparticles used for spray molding and preparation method of composite microparticles
  • Graphene/ceramic composite microparticles used for spray molding and preparation method of composite microparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Sieve the ceramic powder through 200-mesh and 250-mesh sieves, and the particle size of the obtained ceramic particles is 61-74 μm; the water-based polyurethane resin is uniformly coated on the silica ceramic particles by boiling spray coating, The mass ratio of water-based polyurethane resin solution and ceramic powder during coating is 5:100, and the coating is performed twice to prepare water-based polyurethane resin / silica ceramic particles; the process parameters of the coating process are as follows: air inlet temperature 110°C, spray The rate is 2ml / s, and the drying time is 40 minutes; water-based polyurethane resin / silicon dioxide ceramic composite particles are obtained.

[0023] (2) Weigh water-based polyurethane resin / silica ceramic particles and graphene with a mass ratio of 100:0.5, and put them into a horizontal planetary ball mill for ball milling and mixing. The process parameters are as follows: water-based polyurethane resin / silica ceramic composit...

Embodiment 2

[0027](1) Sieve the ceramic powder through 200-mesh and 250-mesh sieves, and the particle size of the obtained ceramic particles is 61-74 μm; the water-based polyurethane resin is uniformly coated on the silica ceramic particles by boiling spray coating, The mass ratio of water-based polyurethane resin solution and ceramic powder during coating is 5:100, and the coating is performed twice to prepare water-based polyurethane resin / silica ceramic particles; the process parameters of the coating process are as follows: air inlet temperature 110°C, spray The rate is 2ml / s, and the drying time is 40 minutes; water-based polyurethane resin / silicon dioxide ceramic composite particles are obtained.

[0028] (2) Use low-temperature plasma to treat waterborne polyurethane resin / silicon dioxide ceramic composite particles. The gas for low-temperature plasma treatment is argon. The process parameters are: gas flow rate 70 ml / min, power 30w, and treatment time 3 minutes.

[0029] (3) Weigh...

Embodiment 3

[0033] (1) Sieve the ceramic powder through a 625-mesh and 800-mesh sieve, and the particle size of the obtained ceramic particles is 15-20 μm; the water-based polyurethane resin is uniformly coated on the silica ceramic particles by boiling spray coating, The mass ratio of water-based polyurethane resin solution and ceramic powder during coating is 5:100, and the coating is performed twice to prepare water-based polyurethane resin / silica ceramic particles; the process parameters of the coating process are as follows: air inlet temperature 110°C, spray The rate is 2ml / s, and the drying time is 40 minutes; water-based polyurethane resin / silicon dioxide ceramic composite particles are obtained.

[0034] (2) Use low-temperature plasma to treat waterborne polyurethane resin / silicon dioxide ceramic composite particles. The gas for low-temperature plasma treatment is argon. The process parameters are: gas flow rate 70 ml / min, power 30w, and treatment time 3 minutes.

[0035] (3) Wei...

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Abstract

The invention discloses graphene / ceramic composite microparticles used for spray molding and a preparation method of the composite microparticles. The graphene / ceramic composite microparticles are composed of ceramic microparticles, water-based polyurethane resin, graphene, and alcohol-soluble resin, the ceramic microparticles are used as core particles, and a water-based polyurethane resin layer,a graphene layer and an alcohol-soluble resin layer sequentially cover the core particles, wherein the thickness of the water-based polyurethane resin layer is 5-15 [mu]m, the thickness of the graphene layer is 0.15-0.75 [mu]m, and the thickness of the alcohol-soluble resin layer is 5-20 [mu]m. The preparation process of the composite microparticles includes the steps of ceramic microparticle pretreatment, low-temperature plasma treatment, graphene coating, and boiling spray coating drying. The graphene / ceramic composite microparticles provided by the invention have a consistent size and goodfluidity, and can be used for spray molding to control the dispersion range and dispersion effect of the graphene in a substrate; and the preparation method provided by the invention has the advantages of low costs, a simple and effective process and no pollution.

Description

technical field [0001] The invention provides a graphene / ceramic composite particle and a preparation method thereof, in particular to a graphene / ceramic composite particle used in the field of spray molding and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial composed of carbon atoms in sp² hybrid orbitals. Its theoretical Young's modulus reaches 1.0TPa, and its inherent tensile strength is 130Gpa, which is one of the highest strength materials currently known. When the temperature is between 50 and 500K, the electron mobility of single-layer graphene is as high as 15000cm2 / (V•s), and in terms of heat conduction, the thermal conductivity of single-layer graphene is as high as 5300W / m•K. However, the high specific surface area of ​​graphene powder makes it prone to agglomeration, and it is difficult to disperse it uniformly in other matrix materials by traditional techniques. [0003] Spray molding is a process t...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B35/628B01J13/02B01J13/22
CPCC04B35/14C04B35/62839C04B35/62802B01J13/02B01J13/22
Inventor 吴海华高纪强范雪婷王俊叶喜葱叶永盛袁有录李波
Owner CHINA THREE GORGES UNIV
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