Pu heat preservation plate material of choice
polyurethane insulation board material choose
isocyanate ( PAPI) Component selection of yantai wanhua PM - 200, the components are fixed. With the increase of dosage of PAPI, the crosslinking density of foam increases, the strength and stiffness increases, but if excessive dosage of PAPI, bubble will be brittle, core material is easy to crack.
first choose polyether polyols, the most important of polyether polyols is one of the basis of the rigid polyurethane raw materials, it affect the physical and mechanical properties of foam core material, dimension stability and foaming process performance. According to the starting dose, hydroxyl value and viscosity of polyether type, with potassium ion content in polyether choose low.
foam stabilizer selection emulsifying ability is advisable. It mainly controls the bubble hole size, maintain the stability of the bubble hole, prevent bubble hole collapse. Organic silicone foam stabilizer has good effect, its usage can be in 1. 5 ~ 2. 5 ( The mass fraction) Regulate the kinds, dosage of foaming agent of polyurethane hard foam density, strength and other physical performance has a direct impact.
foaming agent not only can adjust and control the density of foam products and performance, can also lower the viscosity of the composite polyether, improve its foaming process, the liquidity bubble, bubble forming. Considering the need of sustainable development strategy, now has restricted use of CFC fluorinated hydrocarbons seriously ecological environment destruction, using alternative foaming agent.
flame retardants can improve the fire resistance of foam plastic, but the flame retardants in the foaming process of foam has the damage, on the premise of ensuring better flame retardant effect, ensure the use of plastic foam performance and dimensional stability.
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