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The material of Yangrui's disposable lunch boxes
- Dec 08, 2017 -

The material of Yangrui's disposable lunch boxes and other produts is Polypropylene.

Polypropylene, is a thermoplastic resin obtained by the polymerization of propylene. According to the methyl arrangement is divided into isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene.

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Methyl arranged on the same side of the molecular chain isotactic polypropylene, if the orderly arrangement of methyl in the molecular chain on both sides of said random polypropylene, when the methyl alternately arranged on both sides of the molecular chain between Polypropylene. General industrial production of polypropylene resin, the content of isotactic structure is about 95%, the rest is random or syndiotactic polypropylene. Industrial products such as isotactic as the main component. Polypropylenes also include copolymers of propylene with small amounts of ethylene. Usually translucent colorless solid, odorless non-toxic. Due to the structural regularity and high degree of crystallization, so the melting point can be as high as 167 ℃. Heat-resistant, corrosion-resistant products available steam sterilization is its outstanding advantages. Low density, is the lightest common plastic. The disadvantage is poor low temperature impact resistance, easy to aging, but can be overcome by modification.

Copolymer type PP materials have lower heat distortion temperature (100 ° C), low clarity, low gloss and low stiffness, but have stronger impact strength and PP impact strength increases with ethylene content . Vicat softening temperature of PP is 150 ℃. Due to the high degree of crystallinity, the material has very good surface stiffness and scratch resistance. PP does not exist environmental stress cracking problems.

The melt flow rate (MFR) of PP is usually 1 to 100. Low MFR PP material better impact resistance but lower ductility. For the same MFR material, the impact strength of the copolymer is higher than that of the homopolymer. Due to crystallization, PP shrinkage is quite high, generally 1.6 ~ 2.0%.