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[Chemical Knowledge]：Production process and preparation method of rigid foam polyether

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Rigid foam polyether is a high-performance material widely used in various industries. The foam structure produced by it can have good mechanical properties, sound insulation and thermal insulation properties, and is suitable for construction, furniture, automobiles and other fields. The production process and preparation method of

rigid foam polyether are the key to determine its performance. This paper will focus on this theme to explore the production process and preparation method of hard foam polyether.

1. production process

1. Select the right raw material

rigid foam polyether raw material is mainly polyether polyol and isocyanate. The type and quality of polyether polyol will affect the performance and stability of foam structure. The selection of suitable raw materials needs to take into account the average molecular weight of the polyether polyol, the length of the main chain, the type and density of the functional group and other factors. The types of isocyanates are mainly divided into two types: polytetrahydrofuran diisocyanate (MDI) and biaminophenol (TDI). MDI has excellent flame retardancy, heat resistance and weather resistance, while TDI has more reactivity and fluidity. The selection of suitable isocyanates requires a comprehensive consideration of the application environment and performance requirements of the foam structure.

2. Blowing Agent Formulation

During the formulation of raw materials, it is necessary to add a blowing agent to the polyether polyol. Commonly used blowing agents are water and organic blowing agents such as freon. The choice of foaming agent should take into account the degree of foaming, stability and environmental friendliness.

3. Filling material injection

After the preparation of raw materials and foaming agent is completed, the filling material needs to be injected into the raw materials. Commonly used filler materials are inert gases (such as air, carbon dioxide) and fine particulate matter (such as fine sand). The filling material can increase the density of the rigid foam polyether and enhance the stability of the foam structure.

4. Mold

In the process of producing hard foam polyether, it is necessary to use a mold to make a foam structure. Commonly used mold materials are steel plate and aluminum plate. The design and manufacture of the mold need to take into account the application field and structural form of the rigid foam polyether, so that the foam structure can have good stability and adaptability.

2. preparation method

1. low pressure preparation method

low pressure preparation method is a preparation method of rigid foam polyether. The main step is to mix the raw materials and the foaming agent, and then prepare the foam material by chemical reaction under low pressure. The advantages of this preparation method are stable quality, economical and practical, but it requires a longer reaction time and a larger production space.