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Preparation method for polymer-based density-gradient foam material

A technology of density gradient and foam materials, applied in the field of materials, can solve the problems of inability to prepare density gradient foam materials, enhanced viscosity of PMMA matrix, poor fluidity, etc., and achieve strong designability, ease of operation, and good dimensional stability Sex, simple and controllable effect

Active Publication Date: 2017-10-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The novelty search results of domestic and foreign patents and documents show that: Chinese patent document CN103302861A reports a preparation method of polymethyl methacrylate-based cell gradient material, which uses low content of CNTs or Ag nanoparticles as polymethyl methacrylate The filler of methyl acrylate can regulate the cell diameter, but the density difference of each layer is small, and the foam material with density gradient cannot be prepared. In addition, due to the high content of metal particles in this patent, the viscosity of the PMMA matrix is ​​enhanced, and the flow Therefore, low speed (20-40rpm) and relatively high temperature (220-230°C) are required to evenly disperse metal particles in the matrix in the banbury mixing process, which is different from this patent

Method used

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  • Preparation method for polymer-based density-gradient foam material
  • Preparation method for polymer-based density-gradient foam material
  • Preparation method for polymer-based density-gradient foam material

Examples

Experimental program
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Effect test

specific example 1

[0036]1. Dry and mix Cu particles with a particle size of 1 μm and PMMA particles at a content of 25 wt.% and 30 wt.%, respectively.

[0037] 2. Pour the above mixed system into the internal mixer for high temperature internal mixing for 100min, the speed is 40rpm, and the temperature is 220°C, and then the obtained melt is in the order of 25wt.% Cu / PMMA, pure PMMA, 30wt.% Cu / PMMA laminated.

[0038] 3. The laminated material was hot-pressed in a tablet press at 180° C. to obtain a 2 mm thick gradient composite material sheet, and the hot-pressing time was 40 minutes to obtain a density gradient composite material.

[0039] 4. Put the above-mentioned density 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, and then use a syringe pump to inject carbon dioxide to reach 20MPa, and saturate at constant temperature and pressure for 12h to obtain Gradient Composite Materia...

specific example 2

[0043] 1. 50wt.% Ag particles with a particle size of 500nm and 0.5wt.% Ag particles with a particle size of 500nm are mixed with PMMA particles after drying.

[0044] 2. Pour the above-mentioned mixed system into the banbury mixer for high-temperature banburying for 120min, the rotating speed is 30rpm, and the temperature is 220°C, and then the resulting melt is mixed according to the formula of 50wt. Sequential stacking.

[0045] 3. The laminated material was hot-pressed in a tablet press at 180° C. to obtain a 2.5 mm thick gradient composite material sheet, and the hot-pressing time was 60 minutes to obtain a density gradient composite material.

[0046] 4. Put the above-mentioned density gradient composite material in a high-pressure reactor, blow a small amount of carbon dioxide into it for 3 minutes, then raise the temperature of the high-pressure reactor to 85°C, and then use a syringe pump to inject carbon dioxide to reach 18MPa, and saturate at constant temperature an...

specific example 3

[0050] 1. Dry and mix 5wt.% Ag particles with a particle size of 500nm and PS particles.

[0051] 2. Pour the above mixed system into an internal mixer for high-temperature internal mixing for 50 minutes at a speed of 30 rpm and a temperature of 220°C, and then stack the obtained melts in the order of Ag / PS and pure PS.

[0052] 3. The laminated material was hot-pressed at 170° C. in a tablet press to obtain a 1.5 mm thick gradient composite material sheet, and the hot-pressing time was 50 minutes to obtain a density gradient composite material.

[0053] 4. Put the above-mentioned density gradient composite material in a high-pressure reactor, blow a small amount of carbon dioxide into it for 3 minutes, then raise the temperature of the high-pressure reactor to 90°C, and then use a syringe pump to inject carbon dioxide to reach 15 MPa, and saturate at constant temperature and pressure for 16 hours to obtain Gradient Composite Materials Saturated by Carbon Dioxide Adsorption. ...

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Abstract

The invention discloses a preparation method for a polymer-based density-gradient foam material. The preparation method specifically comprises the following steps: firstly, mixing a mixed system of micron metal particles and a polymer through high-temperature mixing to obtain composite material melts with different densities; secondly, carrying out melting hot-pressing on the melts at a high temperature separately to obtain a density-gradient composite material; and finally, foaming the density-gradient composite material through supercritical carbon dioxide foaming to obtain the polymer-based density-gradient foam material. According to the preparation method disclosed by the invention, the polymer-based density-gradient foam material is prepared from combining a lamination hot-pressing process with a supercritical carbon dioxide foaming technology, the density of the material is adjustable in a range from 0.2g / cm<3> to 1.96g / cm<3>, and the density of a sample presents gradient change at different positions; the diameter of the material is in a micron scale, and the material is high in dimensional stability, structural controllability and mechanical strength, and has wide application prospects in the fields of cushion packaging, impact protection, aerospace, transportation, building energy conservation and the like.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a preparation method of a polymer-based density gradient foam material. Background technique [0002] Density gradient foam material means that the density of the material changes continuously or stepwise from one direction to another with the position of the material, so the performance of the material also changes in a gradient. It has high mechanical strength, thermal shock resistance, high temperature resistance and other excellent properties, which has attracted the attention and attention of many researchers. The earliest research is the density gradient foam material of metal / oxide system. [0003] In recent years, a variety of preparation methods have emerged for gradient composite materials of different systems, such as laminated sintering method, bonding method, self-propagating high-temperature synthesis method, laser heating synthesis method, temperature gradient s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/04B29C44/34B29C44/60B29B11/14B29K23/00B29K25/00B29K505/00
CPCB29B11/14B29C44/0461B29C44/3403B29C44/60B29K2025/06B29K2505/00B29K2233/12B29C49/071B29C2949/0715
Inventor 张联盟张睿智罗国强熊远禄沈强张建王传彬
Owner WUHAN UNIV OF TECH
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