Plasticizers mu Coating Formulations

Plasticizers amagwiritsidwa ntchito kulamulira filimu mapangidwe ndondomeko zokutira zochokera thupi kuyanika filimu kupanga zipangizo. Mapangidwe oyenera a filimu ndi ofunikira kuti akwaniritse zofunikira pazovala zenizeni monga mawonekedwe a filimu youma, kumatira kwa gawo lapansi, kusungunuka, kuphatikiza ndi kuuma kwakukulu nthawi imodzi.

Plasticizers amagwira ntchito pochepetsa kutentha kwa mapangidwe a filimu ndikuwonjezera zokutira; opangira mapulasitiki amagwira ntchito podzilowetsa okha pakati pa maunyolo a polima, kuwalekanitsa (kuwonjezera "voliyumu yaulere"), motero amatsitsa kwambiri kutentha kwa galasi la polima ndikupangitsa kuti ikhale yofewa.

Mamolekyu omwe ali muzinthu zopangira filimu ya polymeric, monga nitrocellulose (NC), nthawi zambiri amawonetsa kutsika kwa unyolo, kufotokozedwa ndi kuyanjana kwamphamvu kwa ma cell (kufotokozedwa ndi mphamvu za van der Waals) zamaketani a polima. Ntchito ya plasticizer ndikuchepetsa kapena kuletsa kwathunthu kupangidwa kwa maulalo otere. Pankhani ya ma polima opangira izi zitha kutheka pophatikiza magawo osinthika kapena ma monomers omwe amalepheretsa kulumikizana kwa maselo; njira iyi yosinthira mankhwala imadziwika kuti "pulasitiki yamkati". Za natural mankhwala kapena ma polima olimba a processing osauka, njira ndi kunja ntchito plasticizers mu ❖ kuyanika chiphunzitso

Mapulasitiki amalumikizana ndi mamolekyu a polymer binder, osachitapo kanthu ndikupanga dongosolo lofanana. Kuyanjanaku kumatengera kapangidwe kake ka pulasitiki, kamene kamakhala ndi zigawo za polar ndi zopanda polar, ndipo zimabweretsa kutsika kwa kutentha kwa galasi (Tg). Kuti zitsimikizire kuti zikugwira ntchito bwino, plasticizer iyenera kulowa mu utomoni pamalo opangira filimu.

Mapulasitala akale ndi zinthu zochepa zolemera mamolekyulu, monga phthalate esters. Komabe, posachedwapa zinthu zaulere za phthalate zimakondedwa chifukwa kugwiritsa ntchito phthalate esters ndikoletsedwa chifukwa chachitetezo chazinthu.