No best answer

1.The difference is: PP is softer, and high-temperature PP is commonly used. There is also a popular name called Baizhejiao-shampoo and other movable covers are made of PP material. Nylon is brittle and hard. It is often used for parts subject to large forces, such as gears. There are also high-temperature nylons, which are used for hair dryers or hair clips.
2.Copolymer PP material has lower heat distortion temperature (100℃), low transparency, low gloss, low rigidity, but has stronger impact strength. The impact strength of PP increases with the increase of ethylene content . The Vicat softening temperature of PP is 150°C. Due to the high crystallinity, the surface rigidity and scratch resistance of this material are very good. PP does not have the problem of environmental stress cracking.
3. The melt mass flow rate (MFR) of PP is usually 1-100. PP materials with low MFR have better impact resistance but lower elongation strength. For the same MFR material, the impact strength of the copolymer type is higher than that of the homopolymer type. Due to crystallization, the shrinkage rate of PP is quite high, generally 1.6~2.0%.
4. The main varieties of nylon are nylon 6 and nylon 66, occupying an absolute dominant position, followed by nylon 11, nylon 12, nylon 610, nylon 612, and nylon 1010, nylon 46, nylon 7, nylon 9, nylon 13, new There are nylon 6I, nylon 9T and special nylon MXD6 (barrier resin), etc. There are many modified varieties of nylon, such as reinforced nylon, monomer cast nylon (MC nylon), reaction injection molding (RIM) nylon, and aromatic nylon , Transparent nylon, high impact (super tough) nylon, electroplated nylon, conductive nylon, flame-retardant nylon, nylon and other polymer blends and alloys, etc., to meet different special requirements, widely used as a substitute for traditional materials such as metal and wood Supplies, as various structural materials.