Foam fresh-keeping box is a box-type packaging container made of foamed plastic (multiple empty plastics). It has many small pores of plastic inside. After the introduction of the above common sense, let's explore common sense about its material advantages.
1. Surface active agent This agent can reduce the external tension of the foam fresh-keeping box, which is beneficial to the uniform and stable foam cells.
The main surface active agents of this product are basically the same as those of phenolic and PU foams. They mainly include polyoxyethylene sorbitol laurate (Tween 20), polydimethylsiloxane-polyoxyalkylene copolymer, epoxy Ethane-propylene oxide block copolymer (L-64).
2. Fillers Adding fillers can reduce the cost of foam fresh-keeping boxes, reduce the intensity and shrinkage of solidified exothermic peaks, improve apparent quality, and improve chemical resistance.
Commonly used are talcum powder, quartz powder, hollow microspheres, etc. However, talcum powder and quartz powder will increase the density of the foam and reduce the mechanical properties. Hollow microspheres with very low bulk density are an ideal filler. They are divided into organic and inorganic materials. Inorganic microspheres such as glass hollow microspheres, ceramic hollow microspheres, organic microspheres such as aldehyde hollow microspheres, and urea aldehyde Solid microspheres, expandable polystyrene particles.
In general, inorganic microspheres are more effective as fillers for epoxy foams, which can improve the strength, heat resistance, dimensional stability, and surface smoothness of foams. However, in the process of foaming and solidification, the phenomenon of floating microspheres will occur, so an appropriate amount of thixotropic agent needs to be added.
3. Thixotropic agent The thixotropic agent has a certain effect on the formation of the cell structure of the ring foam fresh-keeping box, which depends on the type of foam plastic, resin and curing agent produced.
After the introduction of the above content, we can know that the foam preservation box is an outstanding green packaging material. This product is expected to occupy a place in the mall, and customers are welcome to come and buy.
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