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Advantages of using PMI foam

Advantages of using PMI foam

Update:14-04-2022
Summary:PMI foam is a type of polymer material formed by a large num...
PMI foam is a type of polymer material formed by a large number of gas micropores dispersed in solid plastics. It has the characteristics of light weight, heat insulation, sound absorption, shock absorption, etc., and its dielectric properties are better than that of matrix resins. It is widely used. . Almost all kinds of plastics can be made into foamed plastics, and foaming molding has become an important field in plastics processing. Also called porous plastics, plastics with numerous micropores inside are made of resin as the main raw material.

Light weight, thermal insulation, sound absorption, shock resistance, corrosion resistance. There are soft and hard points. Widely used as heat insulation, sound insulation, packaging materials and car and ship shells. Compared with pure plastic, PMI foam has low density, light weight, high specific strength, its strength increases with the increase of density, the ability to absorb impact load, excellent buffering and shock absorption performance, sound insulation and sound absorption performance, thermal conductivity Low rate, good thermal insulation performance, excellent electrical insulation performance, corrosion resistance and mildew resistance.

Flexible foam plastic has excellent elasticity and other properties. PMI foam plastic has a very low bulk density, which can reduce packaging weight and transportation costs; it has excellent shock and vibration energy absorption, and can be used for buffering and shock-proof packaging to greatly reduce product damage; it has strong adaptability to changes in temperature and humidity, and can Meet the requirements of general packaging conditions; low water absorption, low hygroscopicity, good chemical stability, will not corrode the contents, and have strong resistance to acids, alkalis and other chemicals.





Low thermal conductivity, can be used for thermal insulation packaging, such as ice cream cups, fast food containers and thermal insulation fish boxes. The molding process is convenient, and various foam pads, foam blocks, sheets, etc. can be made by molding methods such as molding, extrusion, and injection. It is easy to carry out secondary molding processing, such as foam sheets can be made into various fast food containers by thermoforming. In addition, PMI foam blocks can also be bonded by themselves or with other materials with adhesives to make various cushioning pads and the like.

Polymethacrylimide foam (PMI for short) is a new type of polymer structural foam material with the best comprehensive performance. It has the characteristics of light weight, high strength and high/low temperature resistance. PMI structural foam is a closed-cell, rigid rigid foam obtained by foaming methacrylic acid (MAA) and methacrylonitrile (MAN) copolymer.

The MAA-MAN copolymer sheet is obtained by radical bulk polymerization of MAA and MAN. At the foaming temperature of 180-230°C, the pre-embedded foaming agent in the copolymer is vaporized to obtain the PMI foam sheet. At the same time of high-temperature foaming, the adjacent cyano group (-CN) and carboxyl group (-COOH) in the MAA-MAN copolymer undergo nucleophilic addition reaction to form a cyclic imide structure. The strong polarity and High stiffness endows PMI foam with good overall properties.