I. Impact polypropylene copolymer The traditional modifier of impact polypropylene copolymer is elastomer, usually ethylene-propylene rubber.

Second, the chemical properties and main uses of Kuaihang It is generally believed that rubber particles distributed in semi-crystalline polypropylene matrix can form many stress concentration points and local deformation at the interface to prevent fracture propagation. Impact modifier was added in the blending process. Recently, in-situ synthesis of elastomer components has become very important commercially.

In addition, a series of new impact modifiers are being popularized to replace ethylene-propylene rubber, namely flexible polyolefin, precision elastomer and in-situ polymer. These are olefin polymers, which fill the gap between very low density polyethylene and traditional ethylene-propylene elastomer. Chemical and Performance Impact Polypropylene Copolymer is polymerized from propylene under the catalysis of Ziegler-Natta catalyst system.

4. The ethylene-propylene rubber component is synthesized in a series of reactors or purchased in advance, and then blended with polypropylene homopolymer in an extruder. The prepared impact polypropylene can be sold after granulation. The important properties of impact-resistant polypropylene copolymer produced in the field can be accurately controlled by selecting suitable catalyst composition and reactor conditions. The composition of catalyst and reactor conditions determine the crystallinity of matrix resin, the composition and quantity of rubber components and the total molecular weight distribution. Impact polypropylene copolymer is one of the lightest thermoplastics.

5. Its density is less than 1, and its price per pound is lower than that of pet, PBT, high impact polystyrene and ABS. In terms of specific volume, the unit volume cost of impact polypropylene copolymer is lower than that of resin and PVC. Only HDPE can compare with it in this respect. Impact polypropylene copolymers are usually processed at a moderate temperature of 350 to 550 degrees Fahrenheit. Impact polypropylene copolymers have a wide range of melt flow rates, usually in the range of less than 1 to about 30.

6. The resin with the highest melt flow rate is usually prepared by "visbreaking" the material with lower melt flow rate. That is, the materials from the reactor undergo one-step reaction to reduce the average molecular weight, thereby preparing products with higher melt flow rate. Impact polypropylene copolymer has high resistance to chemical and environmental stress cracking. After treatment, the material can have excellent cantilever impact strength and low Gardner impact performance. The cantilever impact strength ranges from.

Seven, five to 15 foot pounds/inch or more; At -40 degrees Fahrenheit, Gardner impact strength is between 15 and 300 inches or more.