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Polypropylene PP

Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. An addition polymer made from the monomer propylene, it can be produced in a variety of structures giving rise to applications including packaging and labeling, textiles, plastic parts and reusable containers of various types, laboratory equipment, automotive components, and medical devices. It is a white, mechanically rugged material, and is resistant to many chemical solvents, bases and acids.
In 2013, the global market for polypropylene was about 55 million tonnes.Polypropylene is the world's second-most widely produced synthetic plastic, after polyethylene.

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Description of Goods:

 

Chemical and physical properties

Polypropylene is in many aspects similar to polyethylene, especially in solution behaviour and electrical properties. The methyl group improves mechanical properties and thermal resistance, although the chemical resistance decreases.19 The properties of polypropylene depend on the molecular weight and molecular weight distribution, crystallinity, type and proportion of comonomer (if used) and the isotacticity. In isotactic polypropylene, for example, the methyl groups are oriented on one side of the carbon backbone. This arrangement creates a greater degree of crystallinity and results in a stiffer material that is more resistant to creep than both atactic polypropylene and polyethylene.

 

Chemical properties

Polypropylene at room temperature is resistant to fats and almost all organic solvents, apart from strong oxidants. Non-oxidizing acids and bases can be stored in containers made of PP. At elevated temperature, PP can be dissolved in nonpolar solvents such as xylene, tetralin and decalin. Due to the tertiary carbon atom PP is chemically less resistant than PE (see Markovnikov rule).

 

Most commercial polypropylene is isotactic and has an intermediate level of crystallinity between that of low-density polyethylene (LDPE) and high-density polyethylene (HDPE). Isotactic & atactic polypropylene is soluble in P-xylene at 140 °C. Isotactic precipitates when the solution is cooled to 25 °C and atactic portion remains soluble in P-xylene.

 

The melt flow rate (MFR) or melt flow index (MFI) is a measure of molecular weight of polypropylene. The measure helps to determine how easily the molten raw material will flow during processing. Polypropylene with higher MFR will fill the plastic mold more easily during the injection or blow-molding production process. As the melt flow increases, however, some physical properties, like impact strength, will decrease.

 

There are three general types of polypropylene: homopolymer, random copolymer, and block copolymer. The comonomer is typically used with ethylene. Ethylene-propylene rubber or EPDM added to polypropylene homopolymer increases its low temperature impact strength. Randomly polymerized ethylene monomer added to polypropylene homopolymer decreases the polymer crystallinity, lowers the melting point and makes the polymer more transparent.

 

Optical properties

PP can be made translucent when uncolored but is not as readily made transparent as polystyrene, acrylic, or certain other plastics. It is often opaque or colored using pigments.

 

Introduction:

Chemical Name: Polypropylene PP

CAS No.: 9003-07-0

Molecular Fomula:(C3H6)n

Appearance: White powder or faint yellow powder

 

Main feature:

1. The relative density is small, only 0.89-0.91, which is one of the lightest varieties in plastic.

2. Good mechanical properties, except for impact resistance, other mechanical properties are better than polyethylene.

3. With high heat resistance, the continuous use temperature can reach 110-120.

4. Good chemical performance, almost no water absorption, and no reaction with most chemicals.

5. The texture is pure and non-toxic.

6. Good electrical insulation.

7. The transparency of polypropylene products is better than that of high-density polyethylene products.

 

Application

1. Plastic Product: Plastic bags or jumbo Bags

2. Injection Product: Injection molding products are mainly used in small household appliances, daily necessities, toys, washing machines, starting and turning boxes.

3. Film Product :PP film is widely used in packaging, electrician, electronic appliance, adhesive tape, label film, film, compound and so on.

4. Fiber Product: Most often used for packaging, cigarette filter material, geo, building materials, clothing, carpets, sanitary products, etc.

5. Tube Product: Polypropylene pipe has high temperature resistant, easy to pipeline connection (hot melt adhesive, plastic, pipe connection) and recyclable use, mainly used in building water supply system, heating system, farmland water conveyance system, as well as chemical piping system, etc.

 

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Packing & Storage:

●Packing:packed with double-layer plastic woven bag lined with plastic film bag, net weight 25Kg .

●Storage:Keep it in airtight containers and dry,cool and dark place.Damp-proof,far from fire and no contact with corrosive matter.


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