re:Knowledge of the raw materials of the woven bag

As is well known, the raw material of the plastic woven bag is mainly composed of polypropylene, and polypropylene (PP) is a kind of thermoplastic resin prepared by polymerization of propylene monomer. According to the molecular position of -CH3 in the polypropylene molecule, it can be divided into isotactic polypropylene, syndiotactic polypropylene and random polypropylene. Peace and so on as the main ingredient. PP performance by molecular weight and molecular weight distribution of different, county and three-dimensional regularity are closely related. Due to the structural regular and highly crystalline, which is characterized by high softening point, continuous use of the temperature of 100-120 ℃, melting point up to 167 ℃, excellent heat resistance, the product can be steam sterilization. Corrosion resistance, tensile strength of 30MPa, strength, rigidity and transparency are better than poly-ene, with excellent wear resistance and dielectric, chemical stability. The disadvantage is poor resistance to low temperature impact, easy to aging, 朡, high electrostatic, but can be added by light stabilizer, antioxidant, antistatic agent, antibacterial agent and other additives to improve its performance. PP plastic woven bags are isotactic polypropylene as raw material, isothed general requirements greater than 95%, the molecular weight and molecular weight distribution has specific requirements, usually using "drawing grade" or "narrow band" polypropylene as raw material.