Polypropylene; Resin; Primary Resin; Low Price Plastic

• Transport Package: PE Bags
• Specification: 25Kg
• Trademark: moresu
• Origin: China
• Model NO.: PP
• Production Capacity: 3000 Tons/Year

Product Description

Poly is a thermoplastic resin obtained by the polymerization of Poly . It is a white waxy material with a transparent and light appearance. It has the characteristics of non-toxic, odorless, low density, high heat resistance, no water absorption and good electrical insulation. Poly is divided into isotactic poly, atactic poly and syndiotactic poly according to the arrangement of methyl groups. [It is widely used in the production of fiber products, medical equipment, automobiles, chemical containers and other products, as well as in the packaging of food and medicine.

physical properties
Poly is a non-toxic, odorless, tasteless milky white high crystalline polymer with a density of only 0.90--"0.91g/cm3, which is one of the lightest varieties of all plastics. It is particularly stable to water and is The water absorption rate in water is only 0.01%, and the molecular weight is about 80,000-150,000. The formability is good, but the shrinkage rate is large (1%~2.5%). Thick-walled products are easy to dent, and some parts with high dimensional accuracy are required. , it is difficult to meet the requirements, and the surface gloss of the product is good.

Mechanical properties
Poly has high crystallinity and regular structure, so it has excellent mechanical properties. The absolute value of the mechanical properties of poly is higher than that of polyethylene, but it is still a low variety among plastic materials, and its tensile strength can only reach 30 MPa or a slightly higher level. Poly with a larger isotactic index has higher tensile strength, but with the increase of the isotactic index, the impact strength of the material decreases, but it does not change after it drops to a certain value.

Thermal performance
Poly has good heat resistance, and the products can be sterilized at temperatures above 100 °C, and will not deform at 150 °C without external force. The embrittlement temperature is -35 °C, and embrittlement occurs below -35 °C, and the cold resistance is not as good as polyethylene. The reported values for the glass transition temperature of poly are 18qC, 0qC, 5ºC, etc. This is also because people use different samples, which contain different ratios of crystalline phase and amorphous phase, so that the chain length of the amorphous part of the molecular chain is different. caused. The melting temperature of poly is about 40-50% higher than that of polyethylene, about 164-170 °C, and the melting point of 100% isotactic polyis 176 °C.