1
Brief introduction of raw materials
PP raw material, chemical name: polypropylene, features: low density, rigid strength, hardness and heat resistance are better than low-pressure polyethylene, can be used at about 100 degrees.
2
Raw material performance
Physical properties: Melt flow rate 16g/10min
Shrinkage rate 2%-2.5%
Heat distortion temperature 85℃
Mechanical properties: hardness 85
Tensile strength 33MPa
Flexural modulus 1350MPa
Notched impact strength 15kg.cm/cm
Physical and mechanical properties:
A. Strength and rigidity are better than low-pressure polyethylene.
Compared with other plastics, polypropylene has a greater bending fatigue life;
B. The product is sensitive to the gap
Therefore, sharp corners should be avoided during product design, otherwise, stress will be concentrated;
C. The tensile properties are very good, with excellent fiber-forming properties;
D. The wear resistance of polypropylene is worse than that of hard polyethylene but better than polystyrene.
Thermal performance:
A. It has good heat resistance, its melting point is 164~170℃
PP Plastic Hand Basket can withstand boiling disinfection at a temperature above 100℃;
B. Without external force, the temperature will not deform even at 150℃, and it can be used continuously at 110℃ under low load;
C. The resistance to stress relaxation is also good at 90℃, and the low-temperature use temperature can reach -15~20℃;
D. Its catalytic temperature is -35℃ (the catalytic temperature of polyethylene is -60℃).
Electrical performance:
A. Excellent electrical insulator, and because it does not absorb water, it is not affected by air humidity;
B. The breakdown voltage is also high.
But it is a slow-burning material. If the product is required to avoid burning,
Use polypropylene material with a flame retardant release agent. Polypropylene has a low dielectric constant and high dielectric strength.
Chemical performance: Polypropylene has good resistance to chemical erosion and contamination, especially resistance to environmental stress cracking. At room temperature, there is almost no solvent that can dissolve it.
Environment-resistant type: At room temperature, polypropylene plastic is practically completely protected from moisture. In addition to antioxidants for outdoor use of polypropylene, light stabilizers are also required.
