How to choose polyurethane composite board material?
With the increase of PAPI dosage, the crosslinking degree of foamed plastics increased, and the strength and stiffness increased. However, if the amount of PAPI was too high, the foam would become brittle, and the core material would crack easily.
First of all, polyether polyols are most important. Polyether polyols are one of the basic raw materials for forming rigid polyurethane foam. It affects the physical and mechanical properties, dimensional stability and foaming process properties of foam core. According to the initiator, hydroxyl value and viscosity of polyether, the content of potassium ion in polyether is low.
Foam stabilizer is suitable for selecting emulsifying capacity. It mainly controls the size of the bubble, maintains the stability of the bubble and prevents the collapse of the bubble. The organic silicone foam stabilizer has a good effect on this, and its dosage can be adjusted from 1.5 to 2.5 (mass fraction) to directly affect the physical properties of polyurethane rigid foam, such as the type and dosage of blowing agent.
The foaming agent not only can adjust and control the density and performance of foam products, but also reduce the viscosity of the polyether, improve the foaming process, improve the fluidity of the foam, and facilitate the foam forming. In view of the need of sustainable development strategy, CFC fluorocarbons, which cause serious damage to the ecological environment, have been limited to use as alternative foaming agents.
The delayed catalyst system can be chosen to make the time between the milky white time and gel time longer. It can effectively improve the fluidity of the foaming system and improve the foam performance, so as to be suitable for the production process operation. The factors such as whether the foam is uniform in the cavity, the degree of fine foam, and the high porosity of the foam have a great influence on the overall thermal insulation performance of the sheet. These factors are related to the firmness of the foam to the cavity wall, the dimensional stability of the foam and so on.
Flame retardants can improve the fire resistance of foam plastics, but flame retardants have a destructive effect on foam in the process of foaming, and ensure the performance and dimensional stability of foamed plastics on the premise of improving the flame retardant effect.
Polyurethane composite board with better wear resistance and corrosion resistance can show outstanding performance in building heat preservation, heat insulation, sound absorption and noise reduction, so it is very important to choose better. Of course, it is necessary to know more about the price of polyurethane composite board, so we must pay enough attention to it.
