What is a polypropylene? And what's the advantage of thermoplastics it?
What is a polypropylene? And what's the advantage of thermoplastics it? What is a polypropylene? And what's the advantage of thermoplastics it?
polypropylene ( 聚丙烯) For propylene polymer. Abbreviations for PP. Polypropylene raw material is rich, good comprehensive performance, easy to processing molding, the production cost is low, so widely used. The downside is poor toughness at low temperature, high brittle temperature ( 8 ℃ or so) , and easy ageing. In recent years through the modified copolymerization and blending method, the product, its low temperature resistance, impact resistance and aging resistance and so on, therefore, USES the widening. Since the 1950 s, tower, G. Since found isotactic polypropylene, its industrial production is developing very quickly. ,
the main chemical and physical properties of polypropylene heavy molecular weight is about 3 ~ 7105; Qualitative light, density is about 0. 91 g/cm 3; Melting temperature is about 174 ℃; High strength, high hardness, wear resistance and chemical corrosion resistance; Good heat resistance, can be used in the 120 ℃; Its performance is not affected by environmental humidity. The bending fatigue resistance of the products is excellent, bending can withstand hundreds of thousands of times without damage. When machining performance is good, the molding shrinkage rate is low.
polypropylene with acrylic monomers as the main components of polymerization. Industrial production method with solvent method, gas phase, liquid phase ontology ontology method and solution method. But solvent method is widely accepted, the second is the method of ontology.
polypropylene according to take part in the polymerization of monomers, can be divided into two kinds of homopolymerization and copolymerization. Level are gathered by a single propylene monomer polymerization, and therefore have higher crystallinity, high mechanical strength and heat resistance. Copolymerization polypropylene is in polymer mixed with a small amount of copolymerization of vinyl monomers. According to the way of copolymerization, block, there were two kinds of polypropylene random polypropylene. Copolymerization polypropylene with high impact strength, and the random of polypropylene besides have higher impact strength, and good transparency. Compared with other common thermoplastics,
polypropylene with a small specific gravity, good rigidity, high strength, resistance to flexure, and have higher than 100 ℃ heat resistance and good resistance to chemical corrosion, etc. Polypropylene is the deficiency of the poor low-temperature impact resistance, easy to aging, molding shrinkage rate.
according to the requirement of the product and use, can use polypropylene blending, filling, enhancement, add fertilizer, as well as copolymerization, blending, crosslinking methods, such as modified. For example, you can add calcium carbonate, talcum powder, minerals, etc. In order to improve the hardness, heat resistance, dimensional stability; Adding glass fiber, asbestos fiber, mica, glass beads, etc. In order to improve the tensile strength, improve the low-temperature impact resistance, resistance to creep; Add rubber, elastomers, and other flexible polymer, etc. In order to improve the impact resistance and transparency, add a variety of special additives gives polypropylene, such as weather resistance, antistatic property, flame retardancy, electric conductivity, can be electroplating, nucleation, copper pollution resistance, etc. Can use the
polypropylene injection molding, extrusion, blow molding, thermoforming, plastic foam, plastic coated, processing methods, such as production of different USES of products. Because of various processing methods of polypropylene melt properties have different requirements, thus formed the injection molding, extrusion, blow molding, coating, fiber, film, rotomolding grade level and other adapt to different processing requirements. The purpose of the
polypropylene is quite extensive. By injection molding processing, polypropylene can be made into various industrial parts, electrical appliances, building materials and daily necessities; By extrusion production tubing, sheet, bar section, flat wire, fiber, ropes; Use of small containers, bottle blow molding production; Peace with blown film method membrane production IPP film, CPP film, after stretching can obtain high strength, high transparency, OPP film; Using rotomolding method producing large chemical storage tank, vessel, etc. Conversion table packaging printing knowledge