The regular molecular chain structure and strong intermolecular force of PET make it have excellent properties, including high mechanical strength and mechanical properties, high temperature resistance, good optical properties and insulation properties, excellent chemical stability and good recycling performance.

The process route of the non-drying-reaction modification-supercritical foaming technology used in the project to prepare polyethylene terephthalate (PET) foam sheet (board) is as follows:

Polyethylene terephthalate (PET) is a polycondensation reaction product of ethylene glycol and terephthalic acid and has a relatively high melting point. As a thermoplastic engineering material, PET has good mechanical properties, electrical insulation, chemical resistance, creep resistance, fatigue resistance and other characteristics, and is widely used in clothing chemical fiber, packaging and transportation and other fields.

According to the different density, PET foam can be divided into low-density PET foam products and high-density PET foam products. Generally, foam with a density below 100kg/m³ can be considered low-density foam. The current minimum density can be around 60kg/m³, and the density of high-density foam

Thermoplastic prepreg sheet (CFRTP) continues to show potential in the field of aerospace composite materials

In the foaming process, especially under the high shear rate of the extrusion process, as the bubbles grow, the surface tension and melt strength of the PET are insufficient, and the bubble walls become thinner, which easily leads to the rupture of the cells. Therefore, improving the melt strength to prevent cell rupture is a prerequisite for PET foam molding.

Advantages of PET Foam MaterialPET foam has good dimensional stability, good sound insulation, and heat insulation properties. Its short-term maximum working temperature can reach 200 ℃, and it can be used for a long time at a high temperature of 120 ℃, which is much higher than polyethylene (PE), p