Yakhiwa kanjani i-phenol formaldehyde resin?

I-Bakelite iyi-resin phenolic.I-Phenolic resin (PF) iwuhlobo lwemikhiqizo yepulasitiki yezimboni.Izinto zokusetshenziswa zokukhiqizwa kwe-phenolic resin ikakhulukazi i-phenol ne-aldehyde, kanti i-phenol ne-formaldehyde zivame ukusetshenziswa.Zenziwe nge-polymerized ngokusabela kwe-condensation ngaphansi kwe-catalysis ye-asidi, isisekelo nezinye izinto ezibangela.Kunezinhlobo ezimbili zokukhiqizwa kwezimboni: inqubo eyomile kanye nenqubo emanzi.

Ngaphansi kwesenzo se-catalysts ehlukene, i-phenol ne-aldehyde ingakhiqiza izinhlobo ezimbili zama-phenolic resins: enye i-thermoplastic phenolic resin, enye i-thermosetting phenolic resin.Owokuqala ungelapheka kusakhiwo sebhulokhi ngokwengeza i-ejenti elaphayo kanye nokushisisa, kuyilapho okwakamuva kungelapheka kusakhiwo sebhulokhi ngokufudumeza ngaphandle kokwengeza i-ejenti yokwelapha.

I-Thermoplastic phenolic resin kanye ne-thermosetting phenolic resin ingasetshenziswa kuphela ngenethiwekhi yokushintshisana eyakhiwe ngokuphulukisa.Inqubo yokwelapha ukuqhubeka kwe-polycondensation yomumo kanye nokwakhiwa kwemikhiqizo yokuma.Le nqubo ihlukile ekuncibilikeni nasekuphulukisweni kwe-thermoplastics evamile.Zombili izinqubo zomzimba nezamakhemikhali azihlehliseki.

I-phenolic resin ingabunjwa ngendlela efanayo neye-thermoplastic.PF yokubumba umjovoidinga uketshezi oluhle, ingabunjwa ngaphansi kwengcindezi ephansi yomjovo, ukuqina kokushisa okuphezulu, isivinini esiqinile esisheshayo, isicwebezelisi esihle sezingxenye zepulasitiki, ukudilizwa kalula, futhi akukho ukungcoliswa kwesikhunta.Nokho, ukubumba umjovo nakho kunemibi yakho.Isibonelo, ukuncibilika kunqunyelwe uhlobo lokugcwalisa, ngakho-ke akufanelekile ukusebenzisa ukufakwa okuningi ukwenza izingxenye zepulasitiki.Inombolo enkulu yamasango namashaneli ayikwazi ukugaywa kabusha ngemva kokwelashwa, futhi ingalahlwa kuphela.

Ngamafuphi, i-thermoplastic phenolic resin ingakhiqizwa ngomshini ojwayelekile wokubumba umjovo, kepha izimo zenqubo zilawulwa ngokuqinile.I-Thermosetting phenolic resin kumele ikhiqizwe umshini okhethekile wokubumba umjovo we-phenolic resin, futhi isikhunta siphinde samukele isakhiwo esikhethekile sokuklama.

Isetshenziswa kabanzi kuizesekeli zikagesi, izisekelo, izibambi zezibani,amagobolondo omshini we-sandwich, njll;Nokho, ukusebenza kwayo okuntekenteke kanye nenqubo yokucindezela enzima kungase kukhawulele ukukhula kwayo.Ngokuvela kwamanye amapulasitiki, imikhiqizo ye-bakelite akulula ukuyibona manje.Nakuba imikhiqizo ye-bakelite idinga ukushiswa ukuze ibunjwe, isikhathi sokucubungula side kakhulu kunepulasitiki evamile, futhi ukugqokwa kwesikhunta kukhulu, okudinga izidingo eziphakeme zensimbi, kodwa ngenxa yesikhundla saso esizuzisayo ngentengo yezinto zokusetshenziswa, kuba. kusese esikhundleni sezingxenye eziningi zepulasitiki.