Trang chủ News PET Plastic Bottles and applications

PET Plastic Bottles and applications

Some applications of PET (Polyethylene terephthalate) and finished Polyester

Polyethylene terephthalate (known as PET, PETE, or PETP or PET-P) is a thermoplastic resin, the polyester resin and is used in synthetic fibers, beverage containers, food and fluids, can be pressed spray to create shape, and the industry often combined with glass fiber. PET is one of the materials used in the production of fiber crafts.

 

The characteristics of PET is determined by the heat treatment process, it can exist in both the amorphous (transparent) and crystalline (opaque white). Monomer of PET can be synthesized by esterification between acid and ethylene glycol terepthalic make water or chemical transesterification reaction between ethylene glycol and dimethyl terepthalate, methanol is produced.The polymerization was carried out by a multi-polycondensation process of monomer (immediately after or transesterification chemical process of transesterification) with ethylene glycol products (ethylene glycol is recovered in production.)

 

Most industrial PET in the world is synthetic fiber (60%) provide about 30% of world demand. In the field of textiles, applied to PET polyester combined with cotton. Most, PET extrusion applications made ​​products.
PET is manufactured under the trade name Arnite, Impet and Rynite, Ertalyte, Hostaphan, MELINEX and Mylar films, and Dacron, Diolen, Terylene, and Trevira fibers.

 

 

PET can be covered by hard shell or hard shell wrapped items, dictated by the thickness and amount of plastic required. It forms a waterproof membrane air and moisture very well. PET bottle holds beverages such as wine and other types of durable and withstand bumps. PET has natural color with high transparency.
PET can be pulled into thin (commonly known to the trade name Mylar). PET is often wrapped with aluminum to reduce the lead from, making it reflective and opaque. PET bottles are a great container and is widely used to store liquid beverages. PET or Dacron is also used as an insulation layer coating the outside of the International Space Station (ISS). In addition, the PET sandwiched in between polyvinyl alcohol membrane compartment will increase the oxygen permeability.
When the particle or reinforced fiberglass, it becomes remarkably hard and durable. PET is a semi-crystalline sold, traded under the trade name Rynite, Arnite, Hostadur & Crastin.
These are often created by Dacron sails, a kind of PET fiber, light-colored, lightweight rotary instruments usually made of nylon.
PET was found in 1941 by Calico Printer ‘Association of Manchester. PET bottles produced in 1973.
1.1 Properties of PET
One of the important characteristics of PET is the viscosity.
The viscosity of the substance deciliter / gram (dl / g) depends on the polymer chain length. Of the polymer chain length is longer, higher solids, so the higher viscosity. The length of the polymer can be adjusted both through the polymerization process.
The viscosity of a few types:
–           0.6 dl / g: fibrous;
–           0.65 dl / g: a thin film;
–           0.76-0.84 dl / g: Bottle;
–           0.85 dl / g: form ropes.
PET is hygroscopic. When wet, PET during processing, hydrolysis takes place at the contact surface between water and PET, this causes decrease of PET molecular weight (or viscosity) and its mechanical properties . So before plastic processing, moisture must be removed from the plastic. This can be done by using a desiccant or drying prior to processing.
1.2 Drying PET:
During drying, hot air is blown from the bottom floor contains the PET segment was cut, is PET fly suspended in the hot air, it can remove moisture. Hot, humid air from the floor and was led through the refrigeration to remove moisture. Finally, this air is heated again and was back to drying the PET segment at first, the cycle is repeated. Moisture in plastics must be less than 40 ppm (part per million parts of water by weight resin) is satisfactory quality before processing. Drying time should not be shorter than 4 hours, because of lower raw material drying 4 hours, then the temperature would lower PET array of 160oC. At this temperature, the hydrolysis will occur within the PET segment before they are dried.
2. Mackintosh
Even the best raincoat is still watertight after about two months of use. But a new material by the Swiss chemist has invented can help make garments with fluid challenge
Experts at the University of Zurich said they created the new material by coating millions of polyester fibers with silicone to the larger size. When in contact with the fabric, the water droplets exist in the form of demand and people just cloth tilt 2 degrees from horizontal for them to roll off like marbles. Millions of water droplets can come and go from the cloth in such long hours continuously without leaving any trace.
Millions of silicone fibers with a diameter of 40 nanometre (40 billionths of a meter) and are arranged in a structure similar tiny cotton fiber properties is waterproof fabric elements can help challenge fluid. Type Waterproof similar structures also exist in many species of animals and plants in nature, such as lotus leaf surface.
Due to the same format as cotton, tiny silicone filaments can hold air, creating a permanent air layer effectively prevent the water in contact with polyester fiber. Some insects and spiders also use a similar structure to breathe underwater. The new material can maintain dry state even when dipped in water two months.
The process of making a new waterproof material is quite simple. Experts to impact silicone gaseous filaments condense into tiny sizes. Fibrous layer of silicone that can be added to many other fibers, such as wool, cotton, but polyester fibers are best suited.
The tests showed that the new material is relatively stable. Different types of water-resistant materials, it is maintained even when the shape of fibers rubbing. Of course, it is still deformed if thrown into the washing machine daily.
3. The advanced cleaning cloths Microfiber fibers used in civil and industrial
3.1 Fiber Microfiber
As an artificial product, best app in clean technology, a combination of two groups of fibers: Polyester and Polyamide. The fibers are pulverized into a mixture of:
–           80% Polyester: functional yarn clean and scrub;
–           20% Polyamide: functional yarn wicking and fast drying;
–           A range of fibers, Microfiber single tiny, almost impossible to see them with the naked eye;
–           This yarn segment generated definition, can clean all kinds of dirt, stains on the surface without leaving scratches.
Microfiber can be used to clean all the things in the family and in the industry:
–           CD, Monitor, Camera, fax machines, televisions, cars, xemay …;
–           Clean the house, glass, glasses, fashion eyewear …;
–           interior decorations, household furniture …;
–           Jewelry, gold, silver, precious stones …;
–           Construction, when cleaning to perfection;
–           restaurant, hotel, bar, cafe, car wash …;
–           Clean the smallest dirt, oil slick, fingerprint smudges.
3.2 How to use
–           Cotton Style: suitable for cleaning needs regular use in the home, offices, factories;
–           Smooth cloth Style: effective in polishing glass-related items, leather and automobiles;
–           Microfiber towels will absorb all the dust and dirt on the surface is dirty, keep them in the towel and thoroughly clean the surface;
–           When used with just enough water to, if too wet it will leave water stains on the surface to be wiped.
Ý kiến bình luận