Cellulose etherTusaale ahaan waa isku-dhis polymer ah oo laga sameeyay cellulose oo leh qaab-dhismeed ether ah. Giraan kasta oo gulukoos ah oo ku jira macromolecule-ka cellulose wuxuu ka kooban yahay saddex kooxood oo hydroxyl ah, kooxda hydroxyl ee aasaasiga ah ee atamka kaarboonka lixaad, iyo kooxda hydroxyl ee labaad ee atamka kaarboonka labaad iyo saddexaad. Haydarojiinta ku jirta kooxda hydroxyl waxaa lagu beddelay kooxda hydrocarbon si ay u sameeyaan cellulose. Waa wax soo saarka beddelka hydroxyl haydarojiinta kooxda hydrocarbon ee polymer-ka cellulose. Cellulose waa isku-dhis polymer polyhydroxy ah oo aan milmin mana dhalaalin. Cellulose waxaa lagu milmi karaa biyaha, waxaa lagu mili karaa xalka alkali iyo dareeraha dabiiciga ah ka dib etherification, waxayna leedahay sifooyin thermoplastic ah.
Cellulose ether waa erey guud oo taxane ah oo ah badeecooyin ay soo saarto falgalka alkali cellulose iyo wakiilka etherifying xaalado gaar ah. Alkali cellulose waxaa lagu beddelaa wakiilo etherifying kala duwan si loo helo ethers cellulose kala duwan.
Sida laga soo xigtay sifooyinka ionization ee walxaha beddelka ah, tusaale ahaan ether-ka cellulose waxaa loo qaybin karaa ionic (sida carboxymethyl cellulose) iyo non-ionic (sida methyl cellulose) laba qaybood.
Sida ku cad nooca beddelka,ether-yada celluloseTusaale ahaan waxaa loo qaybin karaa hal ether (sida methyl cellulose) iyo isku darka ether (sida hydroxypropyl methyl cellulose). Sida laga soo xigtay milanka, waxaa loo qaybin karaa biyo milma (sida hydroxyethyl cellulose) iyo milanka dareeraha dabiiciga ah (sida ethyl cellulose). Madaafiicda isku dhafan ee qalalan waxay inta badan isticmaashaa cellulose-ka biyaha milma, kaas oo loo qaybin karo nooca milma degdega ah iyo nooca milma dib u dhaca ka dib daaweynta dusha sare.
Isku-darka walxaha ayaa door muhiim ah ka ciyaara hagaajinta sifooyinka hoobiyaha qalalan ee isku-dhafka ah waxayna ka dhigan yihiin in ka badan 40% qiimaha agabka hoobiyaha qalalan ee isku-dhafka ah. Qayb weyn oo ka mid ah isku-darka waxyaabaha ku jira suuqa gudaha waxaa bixiya soo-saareyaasha shisheeye, qiyaasta tixraaca ee badeecadana waxaa bixiya alaab-qeybiyeyaasha. Natiijo ahaan, qiimaha alaabta hoobiyaha qalalan ee isku-dhafka ah ayaa weli sarreeya, waana ay adag tahay in la caan dhigo hoobiyaha dhagaxa caadiga ah iyo hoobiyaha balaastikada ah oo leh tiro badan iyo dhul ballaaran. Badeecadaha suuqa ee heerka sare ah waxaa maamula shirkado shisheeye, soosaarayaasha hoobiyaha qalalan faa'iido yar, qiimo jaban oo hooseeya; Codsiga isku-darka ma laha cilmi-baaris nidaamsan oo bartilmaameedsan, si indho la'aan ah u raac qaacidooyinka shisheeye.
Wakiilka haynta biyuhu waa isku-darka ugu muhiimsan ee lagu hagaajiyo waxqabadka haynta biyaha ee hoobiyaha qalalan ee isku-dhafka ah iyo sidoo kale mid ka mid ah isku-darka ugu muhiimsan si loo go'aamiyo qiimaha walxaha hoobiyaha isku-dhafka ah ee qalalan. Shaqada ugu weyn ee ether cellulose waa inuu hayo biyaha.
Habka ficilka ee ether-ka cellulose ee ku jira weelka waa sida soo socota:
(1) hoobiye ku jira cellulose ether oo ku milmay biyaha, sababtoo ah doorka firfircoon ee dusha sare si loo hubiyo in walxaha jelled si wax ku ool ah u qaybiyaan nidaamka, iyo cellulose ether oo ah nooc ka mid ah walxaha ilaalinta colloid, "xirmo" walxaha adag, iyo dusha sare ee dibadda si loo sameeyo lakab filim saliidayn ah, nidaamka slurry-ku wuu xasilloon yahay, sidoo kale wuxuu hagaajiyaa slurry-ka habka isku darka ee dareeraha iyo dhismaha simbiriirixanka ayaa sidoo kale laga yaabaa.
(2)Cellulose etherxalka sababtoo ah astaamaha qaab-dhismeedka molecular-ka, si biyaha ku jira hoobiyaha aysan u fududaan in la lumiyo, oo si tartiib tartiib ah loogu sii daayo muddo dheer gudahood, taasoo siinaysa hoobiyaha mid wanaagsan oo biyaha lagu hayo oo shaqayn kara.
Waqtiga boostada: Abriil-25-2024