In the process of synthesis of polyurethane resin, why do the reaction raw materials, Sheng and reactor have to be dried well? Common plastic properties-2007-10-(PSU,(PSU ),(PSU,Polysone (PSU) is a class of non-crystalline high-performance engineering thermoplastic containing polysone in the molecular main chain.Divided into transparent,Level 3 specifications for opacity and filling.Due to the benzene of the main chain,Ether,Sultans,The 'hinge' of the isoproyl is coupled together,So the two are rigid,Heat resistance,Poly (ether) flexible.The PSU is transparent,Plastic,Good dimensional stability,Good deformation stability at room temperature,The thermal deformation temperature is 175 °C,Excellent thermal stability of hydrolysis stability,The long-term use temperature is 160 °c,The short-term use temperature is 190 °c,Maintain good performance-100 ℃?150 degrees C.PSU has excellent mechanical properties,The tensile strength is 70?A 75MPa,Bending elastic modulus
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How to make regular inspection records of air purification system inspection management procedures First-effect air filter: Features: small resistance;Large air volume;Long service life.Scope of adaptation: suitable for primary filtration of air conditioning system.\ R medium-effect air filter, mainly used for capturing 1-Particle dust of 5 μm and various suspended solids,It is widely used in various air-conditioning equipment and air-conditioning systems,It is also used for intermediate protection of multi-level filtration system.The medium-efficiency filter is mainly used in central air conditioning and centralized air supply systems.It can be used for primary filtration of air conditioning system,To protect the next level of filters and the system itself,In places where the requirements for air purification and cleanliness are not strict,The air processed by the medium-effect filter can be directly transported to the user.\ R efficient filter is mainly used to capture 0.Particle dust and various suspended
