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Ultrasonic-assisted method for preparing thermosetting epoxy resin microporous foam

An epoxy resin and microcellular foam technology, applied in the field of supercritical carbon dioxide foaming process, can solve the problems of high viscosity, large cells, unstable foam material mechanical properties, etc.

Active Publication Date: 2021-09-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many problems in the preparation of traditional epoxy resin foam materials by supercritical carbon dioxide foaming: the solubility of supercritical carbon dioxide fluid in thermosetting epoxy resin is low, and it is difficult for the gas to form a stable gas with small gas molecule clusters in the polymer matrix. The small bubbles with obvious pore walls form a cross-linked network structure after curing and the viscosity is high, which makes it difficult to mix and diffuse carbon dioxide fluid. After holding pressure in the reactor, the pores formed under high temperature foaming are large and the cells are unstable, resulting in the mechanical properties of the foam material. significantly reduced

Method used

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  • Ultrasonic-assisted method for preparing thermosetting epoxy resin microporous foam
  • Ultrasonic-assisted method for preparing thermosetting epoxy resin microporous foam
  • Ultrasonic-assisted method for preparing thermosetting epoxy resin microporous foam

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preparation example Construction

[0033] The present invention has no special requirements on the source of the thermosetting epoxy resin, and any thermosetting epoxy resin known in the art that requires foaming can be used. In the present invention, the thermosetting epoxy resin sheet is preferably prepared, and the thermosetting epoxy resin is preferably prepared by two methods, and the first preparation method preferably includes the following steps:

[0034] Mix bisphenol A type epoxy resin, hyperbranched epoxy resin, 2-ethyl-4-methylimidazole and modifier in dichloromethane, and obtain modified epoxy resin powder after vacuum drying;

[0035] Pressing the modified epoxy resin powder to obtain a thermosetting epoxy resin sheet;

[0036] The modifier is polyetheramine or polyetheramine-silane coupling agent M2070-KH560

[0037] The invention mixes bisphenol A type epoxy resin, hyperbranched epoxy resin, 2-ethyl-4-methylimidazole and modifier in dichloromethane, and obtains modified epoxy resin powder after...

Embodiment 1-1

[0058] Dissolve 18g of epoxy resin (E12), 2g of hyperbranched epoxy resin (E102), 1g of polyetheramine (M2070), and 0.98g of diethyltetramethylimidazole (2E4MZ) in dichloromethane, and stir evenly at a constant temperature until Mix completely, then dry in a vacuum oven until the dichloromethane is completely removed; finally, process the dry matter into powder, place the powder in a flat vulcanizer and press it under the conditions of 20Mpa and 2h, and put the sheet into a high-pressure reactor Carry out supercritical carbon dioxide saturation adsorption, the adsorption temperature is 50°C, the pressure is 20Mpa, the adsorption time is 72h, the pressure release rate is <2s, and then assisted by continuous ultrasonic foaming at 100°C, the ultrasonic power is 450W, and the foaming time is 15s , to obtain thermosetting epoxy resin microcellular foam.

Embodiment 1-2

[0060] The difference from Example 1-1 is only that the continuous ultrasound is changed to pulse ultrasound, the pulse width of ultrasound is 3s, and the duty cycle is 50%.

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Abstract

The invention provides an ultrasonic-assisted method for preparing thermosetting epoxy resin microporous foam, and relates to the technical field of supercritical carbon dioxide foaming processes. The method comprises the following steps: carrying out supercritical carbon dioxide saturation adsorption on a thermosetting epoxy resin sheet; and foaming the adsorption-saturated thermosetting epoxy resin under an ultrasonic condition to obtain the thermosetting epoxy resin microporous foam. Through energy released in the cavitation effect of ultrasonic waves, the fluidity of carbon dioxide fluid in epoxy resin is promoted, and uniform distribution of gas in a thermosetting resin system is promoted, so that the foaming performance of the epoxy resin is obviously improved, and a uniform and compact foam structure with small pores can be formed.

Description

technical field [0001] The invention relates to the technical field of supercritical carbon dioxide foaming technology, in particular to a method for ultrasonically assisted preparation of thermosetting epoxy resin microcellular foam. Background technique [0002] Supercritical carbon dioxide foaming molding is a physical foaming molding technology, and it is also a microcellular foaming molding technology. It is green, environmentally friendly, has good solubility, low viscosity, large diffusion coefficient, non-toxic, and can realize complex structures. At the same time, the microporous structure can effectively improve the internal stress distribution and provide a higher degree of toughness of the foam material. It is used in many fields as a method for producing a solvent-free functional polymer microporous structure. [0003] Epoxy resin has the advantages of high mechanical strength, low shrinkage after curing, stable size, excellent corrosion resistance, good heat re...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L63/02
CPCC08J9/122C08J2203/06C08J2203/08C08J2363/02C08J2463/02C08J2205/044Y02P20/54
Inventor 史学涛马琰张广成翟薇樊勋高强秦建彬
Owner NORTHWESTERN POLYTECHNICAL UNIV