The higher the porosity of vacuum insulation board core material, the better

As the core material of the vacuum insulation board, the PURF opening rate is as high as possible, and should be at least more than 95. The measurement results on the self-developed open hole rate tester show that after a large amount of formula and process adjustment, it has been developed. Density of more than 95 various densities of small-volume core samples. At present, the formulation process is being further refined and fine-tuned to meet the needs of industrial production. On the other hand, the average pore size has a crucial influence on the thermal insulation properties of vacuum insulation panels. It can be clearly seen that the thermal conductivity decreases as the average pore size decreases. The experimental results are consistent with the analysis results in the first section of this article. Therefore, in order to solve the problem of opening of the core material, the preparation of open-cell microcellular foam is another technical problem. The minimum microporous core material with an average pore size of 140 has been obtained by investigating and analyzing a large number of related technologies at home and abroad and formula testing. . Most of them are prepared by the prepolymer method in foreign countries. Although the effect is ideal, the reaction process is difficult to control and the production process is complicated. We use a relatively straightforward one-step approach.

After vacuum encapsulation, the gas remaining in the closed cells slowly penetrates. Therefore, it is also impractical to pursue a high degree of vacuum one-sidedly. At present, most commercially available vacuum packaging machines are packaged foods, and the ultimate vacuum degree can only reach 10Pa when packaged, which cannot meet the requirements for making vacuum insulation panels. For this reason, its vacuum pump and control system were modified and aluminum coated polyester/polyethylene film was selected as the packaging material. This not only increases the pumping speed, shortens the pump down time, but also effectively prevents atmospheric infiltration and reliably maintains the required static vacuum for a long time.

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