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Doublet closed pore structure foam polymer composite material and preparation method thereof

A technology of foamed polymers and composite materials, applied in the field of porous polymer materials, can solve the problems of mechanical properties that need to be improved, extrusion pressure is difficult to control accurately, and the mechanical strength of foamed materials is low, so as to overcome the size and density of cells Difficult to regulate, increase the controllability of the method, and the effect of easy individual control

Active Publication Date: 2018-01-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses water and supercritical carbon dioxide as foaming agents. Since water will be converted into water vapor during the foaming process, it is difficult to accurately control the extrusion pressure, and the controllability of product performance needs to be improved.
Both the two-component method and the double blowing agent method require the use of supercritical CO 2 Extrusion foaming, the existing extrusion foaming equipment uses two extruders to inject gas through double pumps, which requires high air tightness of extrusion foaming equipment, high equipment cost, and is not conducive to industrial production. In particular, the dual blowing agent method requires the simultaneous injection of water and CO 2 As a foaming agent, it will further increase the airtightness requirements of the extrusion foaming equipment, and the equipment cost will be higher
The porous polymer material with bimodal closed-cell structure prepared by the existing one-step foaming method has a large pore size, the diameter of the large pores is generally greater than 300 μm, and the diameter of the small pores is generally greater than 100 μm, which will cause the mechanical strength of the foamed material to be low. Performance can be improved

Method used

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  • Doublet closed pore structure foam polymer composite material and preparation method thereof
  • Doublet closed pore structure foam polymer composite material and preparation method thereof
  • Doublet closed pore structure foam polymer composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, the foamed polystyrene composite material with bimodal closed-cell structure is prepared, and the steps are as follows:

[0038] (1) Using polystyrene (PS) as the matrix material and fullerene (FE) as the inorganic nano-filler, the solution blending method is used to uniformly disperse FE in PS, and the operation is as follows:

[0039] Add 10g PS to 100mL N,N-dimethylformamide (DMF) at 70°C and stir until PS is completely dissolved to form a PS solution. Add 50mg FE to 50mL DMF, and sonicate for 8h under 200W ultrasonic conditions to make FE Uniformly disperse in DMF to form FE dispersion, and then ultrasonicate the obtained PS solution and FE dispersion for 8 hours under 200W ultrasonic conditions to mix the PS solution and FE dispersion evenly to obtain a composite material dispersion, and control the temperature during the ultrasonic process not to exceed 60°C.

[0040] Using the anti-solvent method, slowly drop the composite material dispersion in...

Embodiment 2

[0045] In this example, the foamed polystyrene composite material with bimodal closed-cell structure is prepared, and the steps are as follows:

[0046] (1) Using PS as the matrix material and multi-walled carbon nanotubes (MWNTs) as the inorganic nanofiller, the MWNTs were uniformly dispersed in the PS by the solution blending method, and the operation was as follows:

[0047] Add 10g PS into 100mL DMF at 70°C and stir until PS is completely dissolved to form a PS solution, add 100mg MWNTs into 50mL DMF, and sonicate under 500W ultrasonic conditions for 2h, so that MWNTs are uniformly dispersed in DMF to form a MWNTs dispersion, and then The obtained PS solution and MWNTs dispersion were sonicated under 500W ultrasonic conditions for 8 hours to mix the PS solution and MWNTs dispersion uniformly to obtain a composite material dispersion, and the temperature during the sonication process was controlled not to exceed 60°C.

[0048] Using the anti-solvent method, slowly drop the ...

Embodiment 3

[0053] In this example, the foamed polystyrene composite material with bimodal closed-cell structure is prepared, and the steps are as follows:

[0054] (1) With PS as the matrix material and FE as the inorganic nano-filler, FE is uniformly dispersed in PS by the solution blending method, and the operation is as follows:

[0055] Add 10g PS into 100mL DMF at 70°C and stir until PS is completely dissolved to form a PS solution, add 5mg FE into 50mL DMF, and sonicate under 200W ultrasonic conditions for 8h, so that FE is uniformly dispersed in DMF to form a FE dispersion, and then The obtained PS solution and FE dispersion were sonicated under 200W ultrasonic conditions for 8 hours to mix the PS solution and FE dispersion uniformly to obtain a composite material dispersion, and the temperature during the ultrasonic process was controlled not to exceed 60°C.

[0056] Using the anti-solvent method, slowly drop the composite material dispersion into 1.5L ethanol to precipitate the ...

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Abstract

The invention provides a doublet closed pore structure foam polymer composite material and a preparation method thereof. The composite material comprises a base material and inorganic nano-fillers, the weight of the inorganic nano-fillers accounts for 0.05wt%-1.0wt% that of the base material, the composite material is provided with large pores and small pores with closed pore structures, the porediameters of the small pores range from 0.5 micrometer to 3 micrometers, and the pore diameters of the large pores range from 5 micrometers to 30 micrometers. The preparation method includes the steps: (1) uniformly dispersing the inorganic nano-fillers into the base material to form the composite material and prepare a formed blank; (2) placing the formed blank into a reactor, increasing the temperature of the reactor to T DEG C, Tg<T<(Tg+20 DEG C), leading CO2 into the reactor until pressure in the reactor reaches 20-30MPa, keeping the formed blank in supercritical CO2 for at least 2 hours,rapidly reducing the pressure in the reactor into normal pressure, foaming the formed blank, and then cooling and shaping the formed blank to obtain the composite material.

Description

technical field [0001] The invention belongs to the field of porous polymer materials, in particular to a foamed polymer composite material with bimodal closed-cell structure and a preparation method thereof. Background technique [0002] The foamed polymer material with a bimodal pore structure refers to a porous material that has both large pores and small pores, and the pore diameters of the two types of pores are quite different. At present, the methods for preparing foamed polymer materials with bimodal closed-cell structure are mainly divided into one-step foaming method and two-step foaming method. [0003] The two-step foaming method refers to the foamed polymer material with bimodal closed-cell structure obtained by changing the foaming conditions twice after the sample or crude product is prepared, mainly including the two-step temperature rise method and the temperature rise and pressure drop synergistic method , the existing two-step foaming method has the disad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L25/06C08L33/12C08L69/00C08K3/34C08K3/36C08K7/24C08K3/04
Inventor 廖霞肖伟李浚松李光宪
Owner SICHUAN UNIV
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