Place polyether or polyester polyol (white material) and polyisocyanate (black material), water, catalyst, surface Raw materials such as active agents, foaming agents, and other additives are added in one step, mixed under high-speed stirring, and then foamed.
One-step foaming process is a commonly used process. There is also the manual foaming method, which is the simplest method. After accurately weighing all the raw materials, place them in a container, then immediately mix the raw materials evenly and inject them into the mold or the space that needs to be filled with foam plastic. Note: When weighing, the polyisocyanate(black material) must be weighed in last.
Polyurethane rigid foam is generally foamed at room temperature, and the molding process is relatively simple. According to the degree of mechanization of construction, it can be divided into manual foaming and mechanical foaming; according to the pressure during foaming, it can be divided into high-pressure foaming and low-pressure foaming; according to the molding method, it can be divided into Pouring foaming and spray foaming.
Extended information
Polyurethane foam has a wide range of applications and has penetrated into almost all sectors of the national economy. It is widely used in furniture, bedding, transportation, refrigeration, construction, thermal insulation and other sectors, and has become one of the indispensable materials.
has become one of the most widely used varieties in plastics. Polyurethane soft foam is mainly used in furniture, bedding and other household products, such as sofas and seats, back cushions, mattresses and pillows; polyurethane hard foam is mainly used in thermal insulation, refrigeration and freezing equipment and cold storage, thermal insulation panels, wall insulation , pipe insulation, storage tank insulation, single-component foam caulking materials, etc.
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