Release time: 2020-02-08 05:10:13
Polyurethane material has a stable porosity structure, which is basically a closed-cell structure. It not only has excellent thermal insulation performance, but also has good freeze-thaw resistance and sound absorption. The average life of rigid polyurethane insulation structure can reach more than 30 years under the conditions of normal use and maintenance. Under normal use conditions of the structure's life, it can not be damaged under the influence of external factors such as the growth of insects, fungi or algae, or the damage of rodents.
The pressure of the polyurethane foaming machine can be changed by setting the number of operations per minute of the air pump, which has high flexibility; the temperature control is achieved by two solid state relays, and PID control is used, which has the advantages of fast response and good stability .
Avoid open flames and avoid heating in the air for a long time, especially heat insulation materials and clothing that are penetrated by polyether polyols tend to ignite naturally, so be careful.
Isocyanate and combined polyether buckets should not be exposed to the sun. They must be kept away from heat sources and placed in a cool and dry place. If the bucket is placed upright, the bucket lid must not collect water! Close the lid immediately after the second use to prevent water vapor and impurities from entering the barrel and affecting the quality. If more than two grades of polyether are used, they should be stacked separately and clearly marked. The storage time of the combined polyether added with ordinary flame retardants should not be too long. It must be prepared and used on the same day, otherwise it will easily cause deterioration and affect the foaming quality.
Polyurethane insulation material is currently the best performing insulation material in the world. About 49% of the building insulation materials in Europe and the United States and other developed countries are polyurethane materials, while in China this proportion is less than 10%. As a high-performance polymer material, polyurethane insulation material has become the fifth largest plastic after polyethylene, polyvinyl chloride, polypropylene, and polystyrene, and the total global output has exceeded 10 million tons per year. The vigorous promotion in building energy conservation and other fields will create huge development space for China's polyurethane industry.
Polyols are divided into 3 types: simple polyols (ethylene glycol, glycerol, etc.); polyester oligomers containing terminal hydroxyl groups used to prepare polyester polyurethane; polyether oligomers containing terminal hydroxyl groups, used to Preparation of polyether polyurethane.
The characteristics of the polyurethane foam machine plastic itself, its weather resistance can not meet the requirements of long-term outdoor use. We use a weather-resistant coating protection method on the surface of the radome to improve the ability of the radome to withstand harsh environments, such as UV radiation resistance and weathering aging, while ensuring the electrical performance of the radome, and greatly extend the life of the radome. After multiple surface coating screening process tests, fluorocarbon paint was selected as the coating material for the radome, and the coating process was determined. The coating was subjected to an aging test according to the procedure of AS'IlVI D4s87-O1. After 3000 h, the color difference ΔE}} was not chalked, cracked, and foamed.
Containers for polyether polyols can be made of steel, aluminum, polyethylene or polypropylene. The storage temperature should not exceed 70 ° C. To prevent moisture absorption and oxidation, it is recommended that the container be filled with nitrogen. Polyether polyol products are generally packed in clean, dry, sealed, leak-free galvanized iron drums.
Polyurethane composite panels are widely used in large industrial plants, cold storage, garages, mobile homes, exhibition halls, stadiums, shopping centers, airports, power plants, villas, hospitals, low-rise and high-rise office buildings, etc. Roofs and walls of industrial and civil buildings.