For refrigeration insulation materials used in pe foam pipe, the companies use the black material and spraying process is basically the same, the appearance of pe foam pipe is very similar.

A. Thermal insulation properties of pe foam pipe.

1. various raw materials and formulations in the moisture content as much as possible, to avoid more moisture content leads to a decline in the thermal insulation performance of the equipment.

2. Put polyether through strict post-processing to ensure high uniformity of foam hole and thin foam hole wall to ensure thermal insulation performance.

3. Do not use ordinary polyester polyol.

Second, the dimensional stability of pe foam pipe.

pe foam pipe if encountered a sharp change in temperature or long-term low temperature changes, there will be dimensional changes (usually shrinkage). We use in addition to its conventional simulation performance tests, but also pay more attention to control the selection of high-quality materials:.

1. combined with a special high-functional polyether, forming a three-dimensional mesh structure of the foam, greatly increasing the low-temperature resistance of the foam. 4110 polyether in the spraying process contains a large number of reactions after the formation of energy-based components, many linear molecular structure at low temperatures is difficult to stabilize.

2. Because polyether is catalyzed with strong alkali in the production stage to ensure that the reaction is complete, polyether is required to maintain a high reaction rate (i.e., the reaction is relatively complete when exposed to black matter).

Some pe foam pipe manufacturers in order to make the obtained foam appearance beautiful, will add porous components in the foam to reduce the closure rate of the foam to achieve a stable size, but this will affect the insulation effect of polyurethane insulation pipe.

Third, the foam duration of pe foam pipe

The basic performance of the initial pe foam pipe and the deterioration of the foam performance is also an important indicator of the foam duration of the insulation material. In the preparation of white material, the surface of some pe foam pipe although the foam has good toughness and impact resistance, but after a period of refrigeration will become brittle, does not have impact and collision performance. In addition, the poor hydrolysis resistance of some polyester structure foam will also affect the use time of the foam. The polyether structure is initially slightly brittle, but the brittleness disappears after a few days, and the stability of refrigerated insulation can be maintained for a long time.