Performance indicators of thermal insulation strips: the indicators specified by the European Standards Committee, the indicators of tenor wind.
Thermal insulation strips protect the environment and save energy are the main theme of the world's development.
In recent years, energy-saving doors and windows with beautiful appearance, flexible operation and reasonable price in the construction market are increasingly favored by users. The government has also formulated a series of policies to support the development of energy-saving doors and windows. As we all know, the metal materials (such as aluminum alloy, stainless steel, etc.) used as window frames have high thermal conductivity, which makes the heat exchange between the inside and outside of the house very fast, which is not conducive to the heat insulation of the house in summer, and also not conducive to the heat insulation and energy conservation of the house in winter. In order to make the metal window frame play the role of heat insulation and energy saving, the inner and outer metal must be separated by plastic with low thermal conductivity. This plastic is not a general plastic, but an engineering plastic, because it must match the metal in strength, modulus or thermal expansion coefficient, so that the metal and plastic can be closely combined without falling off.
According to the regulations of the European Standards Committee, the physical properties of this engineering plastic material must be specified in table L. Table 1 physical properties of engineering plastic materials for thermal insulation (item characteristics, unit values, numerical test standards): 1) hardness HD ≥ 80 -- 2) tensile strength (n / mm2) ≥ 110 ISO 527; 3) elongation at break (%) ≥ 3 ISO 527; 4) impact strength (kJ / mm2) ≥ 30 ISO 179; 5) thermal deformation temperature (℃) ≥ 240 ISO 75; 6) melting point (℃) ≥ 250 -- 7) service life at 80 ℃ (hours) ≥ 50000 --
At present, the composition of this kind of engineering plastic heat insulation strip is mainly polyamide 66 with glass fiber reinforcement. The characteristics are as follows: a. the thermal expansion coefficient is almost the same as that of aluminum alloy, which can avoid falling off between the heat insulation strip and metal due to thermal expansion and cold contraction. b. It can withstand wind pressure, vertical impact force and long-term pressure. c. Capable of withstanding extreme heat treatment. d. After being combined with the metal by rolling, the anodizing treatment or surface treatment can be carried out. e. It can be directly cleaned with various cleaners. f. Condensation can be effectively prevented. g. Energy saving performance is very good. The doors and windows designed with rolled glass fiber reinforced polyamide 66 will not reduce the mechanical strength and water leakage of doors and windows due to thermal expansion and contraction, and the energy saving performance is very ideal. Properties of foreign engineering plastics thermal insulation materials.