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A kind of nanoporous polymer foam and preparation method thereof

A technology of polymers and nanopores, which is applied in the field of fluid foaming to prepare high-magnification nanoporous polymer foams, which can solve the problems of low multiplier ratio of nanoporous polymer foams, limiting the application of nanoporous polymer foams, and complicated processes. Achieve the effects of improving rheological properties, lowering the glass transition temperature, and simplifying the preparation process

Active Publication Date: 2020-04-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are often complicated in process, high in cost and heavy in pollution, and generally the ratio of the obtained nanoporous polymer foam is not high, which greatly limits the application of nanoporous polymer foam in heat insulation and other aspects.

Method used

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  • A kind of nanoporous polymer foam and preparation method thereof
  • A kind of nanoporous polymer foam and preparation method thereof
  • A kind of nanoporous polymer foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A preparation method of nanoporous polymer foam, comprising the steps of:

[0049] (1) Preparation of PMMA / PVDF blend: PVDF and PMMA particles are dried in a vacuum drying oven, and the dried PVDF and PMMA particles are processed according to the ratio of 5%:95% (mass) by using a twin-screw extruder. Melt blending in proportion, the blending temperature is 200°C, and the blending time is 15 minutes. After the blending is completed, the above materials are extruded and air-cooled to prepare rod-shaped splines with a diameter of 3 mm and a length of 2 cm;

[0050] (2) Process of adsorption saturation and induced crystallization of the blend: the rod-like specimen in step (1) is placed in an autoclave, and the autoclave is purged with carbon dioxide and then sealed. Introduce carbon dioxide with a pressure of 6.90MPa, keep the temperature of the autoclave at 25°C, and keep the temperature and pressure constant for 24 hours;

[0051] (3) Foaming process of pressure relief ...

Embodiment 2

[0054] A preparation method of nanoporous polymer foam, comprising the steps of:

[0055] (1) Preparation of PMMA / PVDF blends: PVDF and PMMA particles are dried in a vacuum drying oven, and the dried PVDF and PMMA particles are used according to the ratio of 10%:90% (mass) by using a twin-screw extruder. Melt blending in proportion, the blending temperature is 200°C, and the blending time is 15 minutes. After the blending is completed, the above materials are extruded and air-cooled to prepare rod-shaped splines with a diameter of 3 mm and a length of 2 cm;

[0056] (2) The adsorption saturation and induced crystallization process of the blend: the rod-like specimen in step (1) is placed in an autoclave, and the autoclave is sealed after being purged with carbon dioxide, and carbon dioxide with a pressure of 6.90 MPa is introduced to maintain the high pressure The temperature of the kettle is at 25°C, constant temperature and pressure for 24 hours;

[0057] (3) Foaming proces...

Embodiment 3

[0060] A preparation method of nanoporous polymer foam, comprising the steps of:

[0061] (1) Preparation of PMMA / PVDF blend: PVDF and PMMA particles are dried in a vacuum drying oven, and the dried PVDF and PMMA particles are processed according to the ratio of 5%:95% (mass) by using a twin-screw extruder. Melt blending in proportion, the blending temperature is 200°C, and the blending time is 15 minutes. After the blending is completed, the above materials are extruded and air-cooled to prepare rod-shaped splines with a diameter of 3 mm and a length of 2 cm;

[0062] (2) Adsorption saturation and induced crystallization process of the blend: the rod-shaped specimen in step (1) is placed in an autoclave, and the autoclave is sealed after purging with carbon dioxide, and carbon dioxide with a pressure of 13.79MPa is introduced to maintain the high pressure The temperature of the kettle is at 25°C, constant temperature and pressure for 24 hours;

[0063] (3) Foaming process of...

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Abstract

The invention relates to a nanopore polymer foam and a preparation method thereof, and belongs to the technical field of preparation of polymer foam. The nanopore polymer foam is characterized in thatthe mutual dissolving property of PVDF (polyvinylidene fluoride) and PMMA (polymethyl methacrylate) is utilized, and the PVDF and the PMMA can reach the uniform dispersing at molecule size in a mixture; by leading fluid with certain pressure, the uniformly dispersed PVDF microspheres in the mixture are induced to form crystal grains with certain size, so as to provide a nucleation point with veryhigh concentration for subsequent foaming, and greatly improve the foam pore density; by mixing with the PVDF, the glass-transition temperature of a foaming substrate is reduced, the rheological property of the substrate is improved, the expanding time of the foam pores is effectively prolonged, and the foaming rate of the polymer foam is greatly improved; the large-rate nanopore polymer foam canbe prepared at high efficiency, and the foam pore structure can be effectively regulated and controlled; the technology is simple, the preparation process is green and pollution-free, and the cost islow.

Description

technical field [0001] The invention relates to the technical field of polymer foam preparation, in particular to a method for preparing large-magnification nanoporous polymer foam by foaming fluid. Background technique [0002] Nanoporous polymer foam is considered as a potential super-insulation material, and its internal cell size is tens of nanometers to hundreds of nanometers, which is close to the mean free path of gas molecule motion, which significantly reduces the gas molecule in polymer foam. The heat conduction between the collisions is conducive to making the foam as a whole exhibit excellent heat insulation performance. However, because the cell size of the nanoporous polymer foam is too small and the cell density is extremely high, this makes its preparation process quite difficult; the expansion ratio of the existing nanoporous polymer foam is also very limited, resulting in the thermal conductivity of the solid part On the high side, it greatly limits the im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/12C08L27/16C08J9/12C08J9/14
CPCC08J9/0061C08J9/122C08J9/141C08J2203/06C08J2203/08C08J2205/042C08J2333/12C08J2427/16
Inventor 王桂龙史展林赵国群柴佳龙董桂伟
Owner SHANDONG UNIV
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