About the characteristics of polyurethane raw materials and matters needing attention in use, do you know? Let's get to know about it today. Let's talk about it with you. One of the main raw materials of polyurethane insulation material is polyurethane rigid foam composite polyether. Polyurethane rigid foam combination polyether is also known as white material, and aggregate MDI is known as black and white material. It is suitable for building insulation, solar energy, water heater, cold storage, thermostat, beer tank, refrigeration and other occasions that need to be kept warm and cold.
1. The characteristics of polyurethane raw materials are as follows:
1. Unique heat insulation performance, high efficiency and environmental protection.
2, light weight, low load, excellent waterproof performance, heat preservation and waterproof.
3, simple design, high efficiency, fast progress, good quality and long life.
4, no fluorine foaming, adapt to the environment wide;
Due to the fact that it is impossible to design a closed die for the forming of the insulation layer of large tank, and the necessary closed die extrusion effect can not be produced during the forming process, the foam formed in the semi-free foaming state often has an inevitable forming shrinkage. If the shrinkage is large or uneven, the insulation effect will be reduced. How to strictly control the shrinkage of the tank is a crucial link in the batching and material selection of the tank.
Two. Matters needing attention in the use of polyurethane raw materials are as follows:
1. When foaming, it is best to adjust the material temperature in an appropriate range to ensure that the system has appropriate reactivity and fluidity.
2. When foaming, the ratio of white to black should be determined strictly according to the instructions, so as to ensure that the technological properties of the system and the basic properties of the foam are not affected.
3, do not let the material contact with the water, please pay attention to proper ventilation at the production site.
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