Analysis Of Forming Technology For Polyurethane Foam And Hard Foam Processes

Polyurethane foam is widely used in people's livelihood and economy, especially in transportation, furniture, refrigeration, thermal insulation, construction and other sectors. It is an essential material.
It is one of the most widely used varieties in plastics. Polyurethane soft foam is mainly used in car seat cushions, ship seat cushions, and other places; Polyurethane rigid foam is mainly used for refrigeration equipment, thermal insulation board, thermal insulation and cold storage, pipe insulation, wall insulation, one component foam caulking material, tank insulation, etc.
The polyurethane foaming process can be divided into:
1、 The pre polymer foaming process includes the following steps: making black and white materials into a pre polymer, adding surfactants, catalysts, water, other additives, etc. to the pre polymer, quickly mixing and foaming, and maturing at a certain temperature.
2、 The semi prepolymer method of foaming involves first making a prepolymer of some diisocyanates and polyether polyols, and then adding another part of polyester polyols or polyethers and catalysts, water, diisocyanates, surfactants, and other additives, quickly stirring and mixing for foaming.
3、 The one-step foaming process involves adding polyisocyanate polyethers or polyester polyols, surfactants, catalysts, water, foaming agents, and other additives together, and quickly stirring and mixing them before foaming.
One step foaming method is widely used. In addition, there is the simplest manual foaming method. After weighing all materials, put them into the container, and then immediately mix them evenly, and inject them into the space or mold filled with foam plastic. Attention: Polyisocyanates must be weighed at the end of the weighing process.
Add raw materials such as polyisocyanates, polyether or polyester polyols, surfactants, water, foaming agents, catalysts, and other additives together, and quickly mix and stir for foaming. To achieve such an effect, it is particularly important to choose high-quality brand merchants, such as Cosmore, which focuses on adhesive research and provides customized adhesive application solutions.
The process of forming polyurethane hard foam is very simple, usually foaming at room temperature. According to the pressure during the foaming process, it can be divided into low-pressure foaming and high-pressure foaming; According to the degree of construction mechanization, including mechanical foaming and manual foaming; According to the molding method, it can be divided into spray foaming and pouring foaming.