Introduction to Polypropylene

Polypropylene, Japanese name: ポリプロピレンMolecular formula: C3H6nCAS registration number: 9003-07-0Abbreviation: PP is a thermoplastic resin made by propylene polymerization. According to the position of methyl group, it is divided into three types: isotactic polypropylene, random polypropylene and syndiotactic polypropylene.

PP is a semi-crystalline material, which is harder and has a higher melting point than PE. Since homopolymer PP is very brittle when the temperature is above 0C, many commercial PP materials are random copolymers with 1~4% ethylene or block copolymers with higher ethylene content. Copolymer PP materials have lower heat deformation temperature (100≧), low transparency, low gloss, and low rigidity, but have stronger impact strength. The impact strength of PP increases with the increase of ethylene content. The Vicat softening temperature of PP is 150C. Due to the high crystallinity, the surface stiffness and scratch resistance of this material are very good. PP does not have the problem of environmental stress cracking. Usually, PP is modified by adding glass fiber, metal additives or thermoplastic rubber. The flow rate MFR of PP ranges from 1 to 40. PP materials with low MFR have better impact resistance but lower ductility. For materials with the same MFR, the strength of copolymers is higher than that of homopolymers. Due to crystallization, the shrinkage of PP is quite high, generally 1.8~2.5%. And the directional uniformity of shrinkage is much better than that of materials such as PE-HD. Adding 30% of glass additives can reduce the shrinkage to 0.7%. Both homopolymer and copolymer PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and solubility. However, it has no resistance to aromatic hydrocarbon (such as benzene) solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, etc. PP is also not as resistant to oxidation at high temperatures as PE.

Introduction to PP granulator

PP granulator adopts parallel co-rotating twin-screw extruder barrel and screw designed and manufactured according to the building block principle. According to the requirements of the processing material system and process formula, its aspect ratio, barrel structure, screw arrangement, screen changing structure, exhaust quantity and position, feeding method, electrical control method, etc. can all be optimized and reasonably configured. It can achieve multi-function and multi-purpose to adapt to the processing of polymer materials. The new speed reduction distribution transmission system, high torque design, high-precision gear processing, the main bearings are imported parts, the reasonable oil immersion lubrication of the plastic granulator is combined with the forced lubrication device of the key parts, and the interlocking protection device to ensure the reliable and stable operation of the main machine. Make full use of the limited space to design the latest involute spline structure mandrel to ensure the maximum load-bearing capacity and achieve high torque transmission. The threaded element designed by computer aided design is a meshing conjugate type. It has excellent self-cleaning function and good interchangeability. Its specifications include conveying blocks, mixing blocks, kneading blocks, countercurrent blocks and toothed discs, etc. Through appropriate and reasonable combinations, the material can be transported. Plasticization, shearing, dispersion, homogenization, exhaust, pressure building, etc., realize the process of polymer materials.

Basic configuration process of PP granulator

300 high mixer - stainless steel fully automatic spiral automatic feeder - GLS twin screw granulator - stainless steel cooling water tank - strong suction dryer - gantry granulator

Scope of application of PP granulator

1. Resins that can be processed by granulator

Thermosetting resin (FRP generally uses this type of resin): unsaturated polyester/vinyl ester/epoxy/phenolic/bismaleimide (BMI)/polyimide resin, etc.

Thermoplastic resin: polypropylene (PP)/polycarbonate (PC)/nylon (NYLON)/polyetheretherketone (PEEK)/polyethersulfone (PES), etc.

Synthetic resin: polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polypropylene (PP) and ABS resin, PA, POE, POM, TPR, TPE, and other resins.

2. Types of masterbatches that PP granulator can produce

1. Non-woven fabric filling masterbatch; 2. Color masterbatch; 3. Calcium carbonate high filling masterbatch; 4. Talc high filling masterbatch; 5. Mica high filling masterbatch; 6. Antibacterial masterbatch; 7. Anti-aging agent masterbatch; 8. Anti-ultraviolet masterbatch; 9. Flame retardant masterbatch; 10. Polyolefin stabilized masterbatch; 11. Functional masterbatch for agricultural film; 12. Injection molding filling masterbatch; 13. Vacuum molding filling masterbatch; 14. Blow molding filling masterbatch; 15. PE filling masterbatch; 16. PP filling masterbatch; 17. Transparent filling masterbatch; 18. White masterbatch; .19. Plastic pipe filling masterbatch; 20. Plastic tableware filling masterbatch; 21. Hollow board filling masterbatch; 22. Hollow blow bottle filling masterbatch; 23. Blow film filling masterbatch; 24. Open masterbatch, etc.

3. Special materials that PP granulator can produce

1. Special materials for car bumpers; 2. Special materials for washing machine shells; 3. Special materials for washing machine liner; 4. Special materials for TV shells; 5. Special materials for battery car shells, etc.

4. Cable materials that PP granulator can produce

1. Silane cross-linked cable materials; 2. Polyvinyl chloride cable materials

Other names of PP granulator

Every place or every person calls it differently. Here I roughly list a few commonly used names: plastic granulator, engineering plastic granulator, modified plastic granulator, granulator, masterbatch granulator, plastic extruder, plastic granulator, etc.

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