Performance advantages of PMI foam packaging:
PMI foam packaging has higher mechanical strength, heat resistance, solvent resistance, chemical stability, and shape stability of plastic parts than linear polymers, so in some pairs of strength, temperature and creep, etc. For the occasions with higher requirements, the body polymer is widely used. In order to improve the performance of certain thermoplastic polymer foam packaging to meet certain special performance requirements, radiation crosslinking (physical crosslinking) can be used to produce a certain cross-linked structure between molecular chains. For example, the long-term use temperature of high-density polyethylene is about 100 ° C. After radiation crosslinking, the use temperature can be increased to 135. C (up to 200-300 ° C under anaerobic conditions), it is difficult to complete the crosslinking reaction.
Plastics with resin as the main raw material have numerous micropores inside. Lightweight, heat-insulating, sound-absorbing, shock-proof and corrosion-resistant. There are soft and hard points. Widely used as heat insulation, sound insulation, packaging materials and car and ship shells. Plastic with many tiny pores inside. It is made by mechanical method, while blowing air or carbon dioxide while mechanical stirring, or by chemical method (adding foaming agent). There are two types of closed-cell type and open-cell type. The pores in the closed-cell type are isolated from each other and have buoyancy; the pores in the open-cell type are connected to each other without buoyancy. Can be made of polystyrene, polyvinyl chloride, polyurethane and other resins. Can be used as thermal insulation and sound insulation materials, and has a wide range of uses.
Foam plastic is a kind 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 matrix resins. It has a wide range of uses. Almost all kinds of plastics can be made into PMI foam plastics. Foam molding has become an important field in plastics processing. The structural foam plastics developed in the 1960s are characterized by core foaming and non-foaming of the skin layer. They are hard on the inside and tough on the outside. They have a higher specific strength (strength per unit mass), consume less material, and increasingly widely replace wood. Used in the construction and furniture industry.