Chiyambi cha TPU

Thermoplastic polyurethane (TPU) ndi elastomer yosungunuka ya thermoplastic yokhazikika komanso yosinthika. Ili ndi mawonekedwe a pulasitiki ndi mphira ndipo motero imawonetsa zinthu monga kulimba, kusinthasintha komanso kulimba kwambiri.

TPU, m'badwo watsopano wa zinthu za thermoplastic elastomer. Kapangidwe kake kumaphatikizapo gawo lolimba ndi gawo lofewa, lopangidwa ndi polyols, isocyanate ndi chain extender ndi condensation reaction.
The mbali TPU monga chilengedwe wochezeka, processing zosavuta, ntchito zosiyanasiyana, yobwezeretsanso etc.; TPU ali kwambiri thupi katundu, kukana abrasion, mitundu mosavuta, elasticity mkulu, kukana nyengo, kukana mafuta ndi otsika kutentha kusinthasintha etc., chimagwiritsidwa ntchito pa foni. kesi, overmolding, nsapato, filimu, zomatira, lamba & conveyor, waya & chingwe etc.

Malinga ndi polyols mtundu, TPU akhoza kugawidwa mu kalasi poliyesitala, kalasi polyether, kalasi polycaprolactone ndi polycarbonate kalasi etc.; malinga ndi isocyanate mtundu, TPU akhoza kugawidwa mu onunkhira TPU ndi aliphatic TPU. Mitundu yosiyanasiyana ya TPU ili ndi katundu wosiyanasiyana, imatha kugwiritsidwa ntchito mosiyanasiyana. Mtundu wa kuuma kwa TPU ndi waukulu, wophimba 50A-85D.

• Gawo Lofewa (polyether kapena poliyesitala): Amapangidwa kuchokera ku polyol ndi isocyanate yomwe imapereka kusinthasintha ndi mawonekedwe a elastomeric a TPU.
• Gawo Lolimba (lonunkhira kapena aliphatic): limapangidwa kuchokera ku chain extender ndi isocyanate yopatsa TPU kulimba kwake komanso magwiridwe antchito athupi.
  1. Ma TPU onunkhira - zochokera ku isocyanates monga MDI
  2. Aliphatic TPUs - zochokera ku isocyanates monga HMDI, HDI ndi IPDI

Thermoplastic polyurethanes ndi zotanuka ndi kusungunuka-processible. Zowonjezera zimatha kusintha kukhazikika kwa mawonekedwe ndi kukana kutentha, kuchepetsa kukangana, ndikuwonjezera kuchedwa kwa lawi, kukana kwa bowa, ndi nyengo.

Ma TPU onunkhira ndi ma utomoni amphamvu, okhazikika omwe amakana kuukiridwa ndi tizilombo tating'onoting'ono, amalimbana ndi mankhwala. Kukongoletsa kokongola, komabe, ndiko chizolowezi cha Aromatics amawononga ndi njira zaulere zomwe zimayambitsidwa ndi kutentha kapena kuwala kwa ultraviolet. Kuwonongeka kumeneku kumabweretsa kusinthika kwazinthu komanso kuwonongeka kwa thupi.

Zowonjezera monga ma antioxidants, ma UV absorbers, olepheretsa amine stabilizers amagwiritsidwa ntchito kuteteza polyurethanes ku UV kuwala oxidation motero kupanga thermoplastic polyurethanes oyenera ntchito zosiyanasiyana zomwe zingafunike zonse kutentha ndi/kapena bata.

Aliphatic TPU, kumbali ina, ndi yopepuka yokhazikika ndipo imakana kusinthika kuchokera ku UV. Amakhalanso omveka bwino, zomwe zimawapangitsa kukhala oyenerera ma laminates kuti aziphimba magalasi ndi glazing.