AEROGEL COMPOSITED MELAMINE FOAM HAVING EXCELLENT THERMAL CONDUCTIVITY AND STABILITY

The disclosure relates to an inner frame structure of an open-cell melamine foam for use as an inner frame for a refrigerator, and more particularly to an aerogel composited melamine foam having excellent thermal conductivity and stability. The disclosure provides the aerogel-composited melamine foam having the excellent thermal conductivity and stability by partially or completely filling a silica aerogel in the internal skeleton structure of the open cell melamine foam so that it has improved heat resistance while ensuring excellent insulating properties.

resulting in an open-cell structure having a three-dimensional network structure and a large amount of free volume

The open-cell structure of the melamine foam is a three-dimensional network structure. The interconnectivity of its component cells and the free volume created by this has been studied in detail, and it was shown that the open-cell structure of the melamine foam has a large amount of free volume.

melamine foam

resulting from the filling of the gaps between the voids by an aerogel

One of the most significant advantages of a foam over an aerogel is that it’s easier to make. Foam can be formed by introducing a gas into polymer as it solidifies, whereas aerogels are created through supercritical drying (a process which forces liquid CO2 through a gel). While this process produces great results, it’s not always practical for those working with industrial-scale manufacturing processes—and since aerogels are filled with air rather than another material like polymer, they’re more fragile than foams.

In addition to being easier to work with than aerogels, melamine foams also have superior thermal conductivity and heat resistance thanks to their composition: the open cell structure allows for better airflow throughout each piece and means there are fewer obstacles for heat energy as it travels across them.

for example silicon oxide aerogel is provided.

  • silicon oxide aerogel has a very low mechanical strength due to its porous structure.
  • a powder and granular aerogel in a predetermined mold are filled with silicone oxide aerogel in the mold.
aerogel

The disclosure relates to an inner frame structure of an open-cell melamine foam for use as an inner frame for a refrigerator, and more particularly to an aerogel-composited melamine foam having excellent thermal conductivity and stability.

The disclosure relates to an inner frame structure of an open-cell melamine foam for use as an inner frame for a refrigerator, and more particularly to an aerogel-composited melamine foam having excellent thermal conductivity and stability. The aerogel-composited melamine foam includes a three-dimensional network structure resulting from the filling of the gaps between the voids by an aerogel in a layered lattice structure formed by continuously connecting plurality of cells.

the silica aerogel has a very low mechanical strength due to its porous structure, it cannot be used alone but is filled with a powder and granular aerogel in a predetermined mold

The silica aerogel has a very low mechanical strength due to its porous structure, it cannot be used alone but is filled with a powder and granular aerogel in a predetermined mold. In this way, the silica aerogel is partially or completely filled in the internal skeleton structure of the open cell melamine foam.

A foam having a good thermal conductivity and improved heat resistance by partially or completely filling the silica aerogel in the internal skeleton structure of the open-cell melamine foam.

An aerogel is a porous material with a high thermal conductivity of about 40 W/mK. In general, the thermal conductivity of an aerogel is higher than that of other materials, and its Young’s modulus is lower than that of other materials. As it is cooled up to -100 °C or more, it exhibits supercooling properties. This means that when an aerogel is heated above the freezing point, it will not start to melt but remain in a glassy state until it reaches 0 K (about -273 °C).

aerogel

Melamine resin condensation product is an organic foam having an open cell structure, and has excellent heat insulating and sound absorbing properties 

Melamine resin condensation product is an organic foam having an open cell structure, and has excellent heat insulating and sound absorbing properties. The addition of a fire-retardant to melamine resin condensation products can prevent the occurrence of thermal breakdown and flame spread phenomena during combustion. Therefore, melamine resin condensation products have been widely used in various fields such as building materials and furniture industry. Since melamine resin condensation products are usually not very stable in nature, they cannot be used for a long time at room temperature after production due to the degradation of their thermo-mechanical properties by water absorption or chemical reaction with air pollutants such as CO2 gas or NO2 gas under certain conditions (e.g., aging).

Aerogel is a fluffy, solid material that is produced from a gel. An empty layer of open cell melamine foam has small capillaries throughout it.

The silica aerogel is partially or completely filled in the internal skeleton structure of the open cell melamine foam to provide a foam having excellent thermal conductivity and improved heat resistance, and improving the thermal conductivity by implementing a different density gradient for each layer in the melamine foam. It has the effect of minimizing the loss of aerogel from the aerogel complexed melamine foam.the silica aerogel is partially or completely filled in the internal skeleton structure of the open cell melamine foam to provide a foam having excellent thermal conductivity and improved heat resistance, and improving the thermal conductivity by implementing a different density gradient for each layer in the melamine foam. It has the effect of minimizing the loss of aerogel from the aerogel complexed melamine foam.

Conclusion

It is an object of the present invention to provide a silica aerogel complexed melamine foam that can be easily used as an inner frame of a refrigerator, has excellent thermal conductivity and heat resistance and can be used for a long time, and more particularly to An open-cell melamine foam having a three-dimensional network structure and excellent thermal conductivity by partially or completely filling silica aerogel in the internal skeleton structure of the open cell melamine foam.

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