Yadda za a gane fim din PE da fim na PVC a cikin kullun ko hanyar yau da kullum?
Abin da kuke nema shine gwajin Beilstein.Yana ƙayyade kasancewar PVC ta hanyar gano kasancewar chlorine.Kuna buƙatar tocilan propane (ko Bunsen burner) da wayar tagulla.Wayar jan karfe da kanta tana konewa a tsafta amma idan aka hada shi da wani abu mai dauke da sinadarin chlorine (PVC) sai ya kone kore.Hana wayar tagulla akan harshen wuta (amfani da filashi don kare kanka da amfani da dogon waya) don cire ragowar da ba'a so.Matsa waya mai zafi a jikin samfurin filastik ɗinka ta yadda wasu daga cikinsu su narke akan wayar sannan ka maye gurbin robobin da aka lulluɓe akan harshen wuta sannan ka nemi kore mai haske.Idan ya ƙone kore mai haske, kuna da PVC.
A ƙarshe, PE yana ƙonewa da wari kamar kakin zuma mai ƙonewa yayin da PVC yana da ƙamshin sinadari mai zafi kuma yana kashe kansa nan da nan da zarar an ɗauke shi daga wuta.
"Shin polyethylene daidai yake da PVC?"A'a.
Polyethylene ba shi da chlorine a cikin kwayoyin, PVC yayi.PVC yana da polyvinyl mai maye gurbin chlorine, polyethylene baya.PVC a zahiri yana da ƙarfi fiye da polyethylene.CPVC har ma fiye da haka.PVC yana leach mahadi a cikin ruwa a kan lokaci da suke da guba, polyethylene ba.Rushewar PVC a ƙarƙashin matsin lamba (don haka bai dace da aikace-aikacen iska mai matsawa ba), polyethylene baya.
Dukansu robobi ne na thermoformed.
Shin PVC polyethylene ne?
PVC, ko polyvinyl chloride, shine polyethylene da aka maye gurbinsa.Wannan yana nufin cewa duk sauran carbon na sarkar yana da chlorine daya haɗe tare da hydrogen, maimakon hydrogens guda biyu da aka saba samu akan polyethylene.
Menene filastik polyethylene da aka yi?
Ethylene
Polyethylene (PE), haske, m roba guduro sanya daga polymerization na ethylene.Polyethylene memba ne na muhimmin iyali na resin polyolefin.
Menene haɗin giciye polyethylene?
Polyethylene hydrocarbon ne mai tsayin sarka wanda aka samo shi ta hanyar haɗin kwayoyin ethylene a cikin wani martani da aka sani da polymerization.Akwai hanyoyi daban-daban don gudanar da wannan amsawar polymerization.
Idan aka yi amfani da mai haɓaka inorganic mai tushen Ti (Ziegler polymerization), yanayin amsawa yana da sauƙi kuma sakamakon polymer yana cikin nau'in sarƙoƙi mai cike da ruwa mai tsayi tare da ƙarancin rashin daidaituwa (un-saturated -CH = ƙungiyoyin CH2) ko dai a matsayin ɓangare. na sarkar ko a matsayin ƙungiya mai raɗaɗi.Ana kiran wannan samfurin a matsayin High density Polyethylene (HDPE).Ko da lokacin da aka haɗa co-monomers kamar 1-butene, matakin rashin daidaituwa a cikin polymer (LLDPE) da aka haifar yana da kadan.
Idan aka yi amfani da sinadarin Chromium Oxide bisa tushen inorganic mai kara kuzari, an sake kafa sarƙoƙi na hydrocarbon dogayen layi, amma ana ganin wasu matakan rashin lafiya.Har yanzu wannan shine HDPE, amma tare da reshe mai tsayi mai tsayi.
Idan ana gudanar da polymerization mai ɗorewa, akwai damar duka dogayen sarƙoƙi na gefe a cikin polymer, da kuma maki da yawa na ƙungiyoyin unsaturated -CH = CH2 a matsayin ɓangare na sarkar.Ana kiran wannan resin da LDPE.Ana iya haɗa wasu co-monomers da yawa kamar vinyl acetate, 1-butene da dienes don gyarawa da sarrafa sarkar hydrocarbon, kuma sun haɗa da ƙarin rashin jin daɗi a cikin ƙungiyoyin dangling.
LDPE, saboda babban matakin abun ciki na unsaturation, shine fifiko don haɗin kai.Wannan tsari ne da ke faruwa bayan an shirya polymer na farko na layin layi.Lokacin da aka haɗe LDPE tare da ƙayyadaddun masu ƙaddamar da radical na kyauta a yanayin zafi mai tsayi, yana haɗa sarƙoƙi daban-daban ta hanyar “haɗin kai” ta hanyar.da unsaturated gefen sarƙoƙi.Wannan yana haifar da tsari na uku (tsari mai girma 3) wanda ya fi "m".
Ana amfani da halayen haɗe-haɗe don “saita” takamaiman siffa, ko dai a matsayin mai ƙarfi ko azaman kumfa, farawa da juzu'i, polymer mai sauƙin sarrafawa.Ana amfani da irin wannan tsari na crosslinking a cikin "vulcanization" na roba, inda aka sanya polymer na linzamin da aka yi daga isoprene polymerization a cikin wani tsari mai mahimmanci na 3 ta amfani da sulfur (S8) a matsayin wakili don ɗaure sarƙoƙi daban-daban.Ana iya sarrafa matakin haɗin giciye don ba da takamaiman manufa ga kaddarorin polymer da aka samu.
Lokacin aikawa: Oktoba-11-2022