A composite insulation material for the development of easy cutting in Japan well
A composite insulation material for the development of easy cutting in Japan well
Japan's industrial technology research institute system research department of nano chemical process (INOAC) inoue company cooperation with Japan team developed is composed of PP (polypropylene) and silica aerogel composite insulation materials. Its thermal insulation properties are close to vacuum insulation, easy to cut and bend. It can be insulated in a small and complex space, and it is also excellent for vibration resistance. Therefore, it is expected to be used for heat insulation purposes such as automobiles, aircraft and heat engines.
As is known to all, vacuum insulation material is a high performance insulation material, but it is difficult to be processed at will, poor performance, no support surface and so on. However, the materials of silicon dioxide gel, such as silica aerogels and non-woven fabrics and polymers, have been realized by the very low density of silica gel. This composite material does not need to be kept in a vacuum and is well processed, so it has been used recently. However, the problem of "powder drop" caused by the silica shedding of these insulation materials has not been popularized. If there is a soft, and the insulation of high performance, can be used in the automobile body and around the engine and other surface and narrow space, the traditional material is difficult to realize heat insulation components and mechanism, to promote energy conservation and environmental protection.
The csi has been working on the development of the preparation process of silica aerogel with high pressure CO2 and the composite insulating material of silica aerogel and polymer as a heat insulation material. In Japan, the company has been working on the development of polymer products such as ammonia ester, rubber and plastic, which has a strong technical strength in the development of foaming polymer with high pressure CO2. In the process of development of these products, the two companies have a common goal in the use of high pressure CO2, so they decided to establish a cooperative system, thus contributing to the cooperative development.
This composite thermal insulation material is used in the two sides of the surface of the development of high - pressure CO2 - based PP foaming material. After the low density silica gel was prepared by using sol-gel method in this PP foaming body, the supercritical drying of CO2 was prepared and the silica aerogel was prepared. The dry conditions were selected to remove the solvent from the gel without affecting the foaming of PP, and the composite insulation material containing silica aerogel was prepared in PP foaming body (figure 1). The chemical stability of PP is excellent. As a general polymer, it has high heat resistance and is expected to be used for a wide range of applications.
PP foaming body soft, silica aerogel can be deformed by compression. Therefore, the composite insulation materials developed this time can be processed into curved shapes. In addition, the previous silicon dioxide aerogel incision is easy to break, so it is difficult to process with the tool, and this time the compound insulation material can be easily processed with the tool.
By composite insulation material folding test off powder, compared the results found no surface of polymer porous body and silica aerogel composite insulation material as a result of falling powder weight 9.7 ~ 27%, and the composite heat insulation materials for powder reduced only 2.1%.
The thermal conductivity of this composite thermal insulation material is 0.016 W/mK, which is better than the ordinary heat insulation materials such as glass wool (0.04 ~ 0.05W/mK) and foamed polystyrene (0.03 ~ 0.04 W/mK), which is close to the vacuum insulation material (0.01W/mK) (figure 2). In addition, the moisture absorption caused by the degradation, the thermal insulation performance and the long-term stability of the shape is also excellent.
In the future, low-cost manufacturing processes will be developed and the high performance thermal insulation materials will be popularized and samples will be supplied to various USES to establish a supply system. In addition, due to the thermal insulation stability and good processing of the composite insulation materials, it can be used as a standard sample for thermal insulation material evaluation
