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Preparation method of polymethyl methacrylate based cell gradient material

A technology of polymethyl methacrylate and gradient materials, which is applied in the field of gradient materials, can solve the problems of not using adhesive-free cell gradient materials, and achieve the effects of environmental protection, simple process, and wide application prospects

Active Publication Date: 2013-09-18
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The results of the novelty search of domestic and foreign patents and literature show that there is no literature research report on the preparation of non-adhesive cell gradient materials by melting and hot pressing different composite materials.

Method used

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  • Preparation method of polymethyl methacrylate based cell gradient material
  • Preparation method of polymethyl methacrylate based cell gradient material
  • Preparation method of polymethyl methacrylate based cell gradient material

Examples

Experimental program
Comparison scheme
Effect test

specific example 1

[0028] 1. Disperse 0.5wt.% silver nanoparticles and 0.5wt.% carbon nanotubes evenly into the PMMA matrix to prepare Ag / PMMA and CNTs / PMMA nanocomposites.

[0029] 2. Laminate CNTs / PMMA, Ag / PMMA and pure PMMA sheets, melt and hot press at 210°C to form a gradient composite material.

[0030] 3. Put the prepared gradient composite material in the autoclave, blow it with a small amount of carbon dioxide for 3 minutes, then raise the temperature of the autoclave to 95°C, then use the syringe pump to inject carbon dioxide to 20MPa, and saturate at constant temperature and pressure for 6h. Gradient composite materials saturated with carbon dioxide adsorption are obtained.

[0031] 4. Quickly unscrew the pressure relief valve to release the pressure to normal pressure, remove the heating device after 60 seconds, put the autoclave into the ice-water mixture to cool down, and obtain the cell gradient material.

[0032] The cell structure of the cell gradient material is as follows fi...

specific example 2

[0034] 1. 0.5wt.% silver nanoparticles and 1wt.% silver nanoparticles were evenly dispersed in the PMMA matrix to prepare Ag / PMMA nanocomposites with different contents.

[0035] 2. Laminate 0.5wt%Ag / PMMA, 1wt.%Ag / PMMA and pure PMMA sheets, melt and hot press at 210°C to form a gradient composite material.

[0036] 3. Put the prepared gradient composite material in the autoclave, blow a small amount of carbon dioxide into the autoclave for 3 minutes, then raise the temperature of the autoclave to 50°C, and then use a syringe pump to inject carbon dioxide to reach 12MPa, and saturate at constant temperature and pressure for 6h to obtain Gradient Composite Materials Saturated by Carbon Dioxide Adsorption.

[0037] 4. Quickly unscrew the pressure relief valve to release the pressure to normal pressure, remove the heating device after 180s, put the autoclave into the ice-water mixture to cool down, and obtain the cell gradient material.

[0038] The cell structure of the cell gra...

specific example 3

[0040] 1. 1wt.% silver nanoparticles and 1wt.% carbon nanotubes were evenly dispersed into PMMA matrix to prepare Ag / PMMA and CNTs / PMMA nanocomposites.

[0041] 2. Laminate CNTs / PMMA, Ag / PMMA and pure PMMA sheets, melt and hot press at 210°C to form a gradient composite material.

[0042] 3. Put the prepared composite material in the autoclave, blow it with a small amount of carbon dioxide for 3 minutes, then raise the temperature of the autoclave to 65°C, and then use a plug pump to inject carbon dioxide to reach 7.5MPa, and saturate at constant temperature and pressure for 6h, to obtain Gradient Composite Materials Saturated by Carbon Dioxide Adsorption.

[0043] 4. Quickly unscrew the pressure relief valve to release the pressure to normal pressure, remove the heating device after 10 seconds, put the autoclave into the ice-water mixture to cool down, and obtain the cell gradient material.

[0044] The cell structure of the cell gradient material is as follows image 3 As ...

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Abstract

The invention discloses a preparation method of a polymethyl methacrylate based cell gradient material. The preparation method comprises the following steps of: laminating, heating and softening the polymethyl methacrylate based nanometer composite material which comprises a carbon nono-tubes (CNTs) filling or an Argentine nanometer particle (Ag) filling, melting and hot-pressing the treated material to obtain a gradient composite material, adding the gradient composite material into a supercritical carbon dioxide fluid, and carrying out quick release foaming, wherein the foaming process comprises the following steps of: adding the gradient composite material into a high-pressure kettle, filling the supercritical carbon dioxide fluid into the kettle, adjusting the pressure of the fluid to 7.5-20MPa and the temperature to 50-140 DEG C, maintaining the pressure for 6-10 hours, turning on a pressure release valve to fast release the pressure to normal pressure, and cooling the resulting material to room temperature after 10-180 seconds to obtain the cell gradient material. As for the material prepared by using the preparation method disclosed by the invention, the cell diameter is controlled at micron dimension, the volume density is small, the cell density can be designed and controlled, the mechanical strength and the size stability are good, and therefore the material has wide application prospect in the fields of space flight and aviation, electronic packaging, building construction and the like.

Description

technical field [0001] The invention relates to a gradient material, in particular to a PMMA (polymethyl methacrylate)-based cell gradient material prepared by supercritical carbon dioxide foaming technology. The cell diameter can be controlled at the micron level, the volume density is small, and the cell density Can be designed and controlled. Background technique [0002] Gradient material is a new type of composite material developed to meet the needs of new materials in high-tech fields and to meet the repeated normal work in extreme environments. Its composition and structure are gradiently changed along the thickness direction, so the properties of the material are also gradiently changed. Because of its high mechanical strength, thermal shock resistance, high temperature resistance and other excellent properties, once it was proposed, it attracted great attention from researchers all over the world and started research on it. For example, the hotter Ti / Al was studi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/20C08L33/12C08K7/00C08K3/04C08K3/08
Inventor 沈强袁欢强熊远禄罗国强张联盟李俊国王传彬
Owner WUHAN UNIV OF TECH
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