Kodi phenol formaldehyde resin imapangidwa bwanji?

Bakelite ndi phenolic resin.Phenolic resin (PF) ndi mtundu wazinthu zamapulasitiki zamafakitale.Zopangira zopangira phenolic resin makamaka phenol ndi aldehyde, ndipo phenol ndi formaldehyde zimagwiritsidwa ntchito kwambiri.Iwo polymerized ndi condensation anachita pansi catalysis wa asidi, m'munsi ndi catalysts ena.Pali mitundu iwiri ya kupanga mafakitale: ndondomeko youma ndi ndondomeko yonyowa.

Pansi pa zopangira zosiyanasiyana, phenol ndi aldehyde zimatha kupanga mitundu iwiri ya ma resins a phenolic: imodzi ndi thermoplastic phenolic resin, inayo ndi thermosetting phenolic resin.Yoyambayo imatha kuchirikizidwa kukhala midadada powonjezera machiritso ndi kutenthetsa, pomwe yotsirizirayo imatha kuchirikizidwa kukhala ma block potenthetsa popanda kuwonjezera machiritso.

Thermoplastic phenolic resin ndi thermosetting phenolic resin zitha kugwiritsidwa ntchito kudzera pa netiweki yosinthira yomwe imapangidwa ndikuchiritsa.Njira yochiritsira ndikupitilira mawonekedwe a polycondensation komanso kupanga mapangidwe azinthu.Izi ndizosiyana ndi kusungunuka ndi kuchiritsa kwa thermoplastics wamba.Zonse zakuthupi ndi zamankhwala sizingasinthe.

Phenolic resin imatha kupangidwa mofanana ndi thermoplastic.PF yopangira jakisoniamafuna fluidity wabwino, akhoza kuumbidwa pansi pa kuthamanga otsika jekeseni, mkulu matenthedwe stiffness, mofulumira kuumitsa liwiro, bwino pamwamba gloss wa zigawo pulasitiki, demoulding mosavuta, ndipo palibe kuipitsa nkhungu.Komabe, kuumba jekeseni kulinso ndi zovuta zake.Mwachitsanzo, kusungunula kumachepa ndi mtundu wa zodzaza, kotero sikoyenera kugwiritsa ntchito zowonjezera zambiri kuti mupange zigawo zapulasitiki.Zipata zambiri ndi ngalande sizingasinthidwenso pambuyo pochiritsa, ndipo zitha kutayidwa.

Mwachidule, thermoplastic phenolic resin imatha kupangidwa ndi makina wamba opangira jakisoni, koma momwe zimakhalira zimayendetsedwa mosamalitsa.Thermosetting phenolic resin iyenera kupangidwa ndi makina apadera opangira jakisoni a phenolic resin, ndipo nkhunguyo imatenganso kapangidwe kake kapadera.

Amagwiritsidwa ntchito kwambiri muzipangizo zamagetsi, soketi, zouzira,makina a sandwich zipolopolondi zina;Komabe, kachitidwe kake kosalimba komanso kukanikiza kovutirako kungachepetse kukula kwake.Ndi kutuluka kwa mapulasitiki ena, zinthu za bakelite sizosavuta kuziwona tsopano.Ngakhale kuti zinthu za bakelite ziyenera kutenthedwa kuti zipangidwe, nthawi yokonza ndi yaitali kuposa mapulasitiki wamba, ndi kuvala nkhungu ndi zazikulu, zomwe zimafuna zofunikira zapamwamba zachitsulo, koma chifukwa cha malo ake opindulitsa pamtengo wamtengo wapatali, ndizofunika kwambiri. akadali choloŵa m’malo mwa zigawo zambiri zapulasitiki.