The main functions and characteristics of polyurethane foam

The main functions and characteristics of polyurethane foam

Summary:Polyurethane rigid foam is a polymer made of isocyanate and ...
Polyurethane rigid foam is a polymer made of isocyanate and polyether as the main raw materials, mixed by special equipment under the action of a variety of additives such as foaming agents, catalysts, flame retardants, etc., and foamed on site by high-pressure spraying. There are two kinds of polyurethane foam, soft foam and hard foam. Soft foam is open pore structure, hard foam is closed pore structure; soft foam is divided into two kinds of crust and non-crust.

The main function of polyurethane soft foam is cushioning. Polyurethane soft foam is often used in sofa furniture, pillows, cushions, toys, clothing and sound insulation lining.

Polyurethane rigid foam body is a new synthetic material with thermal insulation and waterproof function, its thermal conductivity is low, only 0.022~0.033W/(m*Κ), which is equivalent to half of extruded plastic board, and it is the current Z low thermal conductivity of all thermal insulation materials. Rigid polyurethane foam is mainly used in building exterior wall insulation, roofing waterproof insulation integration, cold storage insulation, pipe insulation materials, building panels, refrigerated trucks and cold storage insulation materials. Foam is a kind of foam, it is the characteristics of foam foam with modulus of elasticity greater than 700MPa:

(1) Very low bulk weight, can reduce the weight of packaging, reduce transportation costs.

(2) has excellent shock, vibration energy absorption, used for cushioning shockproof packaging can greatly reduce the breakage of products.

(3) adaptability to changes in temperature and humidity, can meet the requirements of the general packaging situation.

(4) low water absorption, low moisture absorption, good chemical stability, itself does not produce corrosion of the contents, and has a strong resistance to acids, alkalis and other chemicals.

(5) low thermal conductivity, can be used for thermal insulation packaging, such as ice cream cups, fast food containers and insulated fish boxes, etc.

(6) Easy molding and processing, can be made into various foam liners, foam blocks, sheets, etc. by molding methods such as molding, extrusion and injection. Easy to secondary molding process, such as foam sheets by thermoforming can be made into a variety of fast food containers, etc.. In addition, foam blocks can also be bonded with adhesives or bonded with other materials to make a variety of cushion liner, etc.