PET(polyester) it is material of a kind of when from 60 time second half period ability gets developing generally new-style synthesis, be by to benzene 2 formic acid (PTA) and glycol (EG) classics ester is changed and condensation polymerization reacts (PTA law) and make, or through be opposite ester of 2 formic acid and glycol undertake benzene ester trade reaction and condensation polymerization (DMT law) and make PET colophony. Regard the new-style synthesis that develops generally as material, the advantage of PET oneself very apparent, basically include when:
(The mechanical performance with superior 1) and wear-resisting function;
(2) is better be able to bear or endure creep function and tigidity;
(3) water imbibition is very low, linear expansion coefficient small, dimension stability is tall;
(The thermal stability with taller 4) , specific heat and heat conduction rate are minor;
(The dielectric protecties with admirable 5) ;
(6) is able to bear or endure admirably chemical function is waited a moment.
The use that this decided PET also very extensive, among them dosage is the biggest is production fiber, it is to make bottle next, it is production film and sheet again, in addition also use at project utility, wait for an industry like electric equipment of car, electron, appearance and furniture.
Nearly two years, PET container is used at milk to pack have new breakthrough in the world, pasteurize feeder of Italy begins to be packed by HDPE instead PET, solved the blemish such as the peculiar smell that polyolefin bottle packs and mouthfeel difference. The corresponding device that plays outfit of model, fill and gland to be an organic whole also by happy company is solved on the west. In addition, edible oil, dressing, soy, vinegar is the market that PET bottle demand rises ceaselessly, for PET development provides very large space.
The PET that applies on the plastic mart that pack more and more be welcomed by broad user place, the development trend that its replace vitreous bottle to pack also is in one step by step evolve in. Be in China especially the position in big country of this course of study that pack, already gradually firm and the development that began development. Especially market of PET beer bottle more conceal is worn inviting business chance. Our country is the world big country of the first beer, still pack with vitreous bottle at present give priority to, and the country such as beautiful, day, Europe already had partial beer works to use PET to pack. With crop of our country beer bottle of 20% use PET is calculated, need 28 billion about - 30 billion beer bottle.
Current, bottle of the PET on international processing technique change quickly, emerge in endlessly, its basically develop way is to improve block ooze function and heat-resisting performance. Appeared thereby technology of exterior Tu Fu, inject in all drawing blows model technology and mix modified technology to wait in all, these technical home have introduce. And be worth those who take seriously to cause is new technology of bottle of PET of accept rice modified, contain 10% ～ the argil accept rice of 30% and nylon are compound become tall cut off PET of accept rice modified, it is the main attack direction of PET beer bottle. For example, group of Zhang Gong of our country Henan uses accept rice technology to undertake wall Tu Fu to PET beer bottle, raise PET bottle to fight the function of ultraviolet ray, oxygen, carbon dioxide, obtained better result.
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