Pmi core foam chemistry
The core foam chemistry principles can be divided into two categories. A chemical blowing agent that releases gas upon heating is used. Common chemical foaming agents such as azodicarbonamide, azobisisobutyronitrile, N,N'-dinitrosopentamethylenetetramine, sodium hydrogencarbonate. Many thermoplastics can be made into foam in this way. For example, PVC foam shoes are made from resins, plasticizers, foaming agents and other additives for use in injection molding machines. The blowing agent ruptures in the barrel and the material foams in the mold. . The foamed artificial leather is mixed with a foaming agent to prepare a polyvinyl chloride paste. Scratching or calendering on the fabric, continuously passing through the tunnel furnace, the material is plasticized and melted, the blowing agent is decomposed and foamed, cooled and the surface finish is made from foamed artificial leather. Forming rigid PVC low foam sheets, tubes or profiles by extrusion. The blowing agent decomposes...