Hydroxyethyl cellulose (HEC) waa ether nonionic cellulose eter-biyo ah, iyo isha ugu weyn waa cellulose dabiiciga ah. Cellulose dabiiciga ah ayaa si weyn ugu dhex jira dhirta waana qaybta ugu muhiimsan ee derbiyada unugyada dhirta. Gaar ahaan, hydroxyethyl cellulose waxaa lagu sameeyaa iyadoo kiimiko ahaan uga falcelinaya cellulose dabiici ah oo leh ethylene oxide hoos yimaada xaaladaha alkaline. Habka falcelinta kiimikaad waxaa badanaa loo yaqaan 'ethoxylation', natiijaduna waxay tahay in kooxaha hydroxyl ee ku jira molecules cellulose ee dabiiciga ah ay qayb ahaan ama gebi ahaanba beddelaan si ay u sameeyaan hydroxyethyl cellulose oo leh kooxo ethoxy.
Kuwa soo socda waa tillaabooyinka gaarka ah ee habka diyaarinta ee cellulose hydroxyethyl:
Isha cellulose: Cellulose waxaa badanaa laga soo saaraa alaabta dhirta sida suufka iyo alwaax. cellulose-ka la soo saaray waa la nadiifiyaa oo la nadiifiyaa si looga saaro wasakhda sida lignin, hemicellulose iyo qaybaha kale ee aan cellulose ahayn si loo helo cellulose nadiif ah oo sarreeya.
Daawaynta Alkalinization: Isku qas cellulose iyo xalka sodium hydroxide (NaOH), iyo kooxaha hydroxyl ee cellulose waxay la falgalaan sodium hydroxide si ay u soo saaraan sodium cellulose. Habkan, qaab-dhismeedka molecular cellulose wuxuu ku fidaa ilaa xad, taas oo sahlaysa in ay ka falceliso ethylene oxide.
Dareen-celinta Ethoxylation: Salulose sodium Alkalized waxa lagu qasaa ethylene oxide (C2H4O) heerkul iyo cadaadis gaar ah. Qaab dhismeedka giraanta ethylene oxide ayaa u furma si ay u sameeyaan kooxaha ethoxy (-CH2CH2OH), kuwaas oo isku dara kooxaha hydroxyl ee unugyada cellulose si ay u sameeyaan hydroxyethyl cellulose. Habka falcelintan waxaa loo fulin karaa heerar kala duwan, taasoo keentay in hydroxyethyl cellulose leh heerar kala duwan oo beddelaad ah.
Daawaynta ka dib: Alaabta fal-celinta ka dib waxay inta badan ka kooban tahay alkali aan falcelin lahayn, dareereyaal iyo alaabooyin kale. Si loo helo cellulose hydroxyethyl saafi ah, tillaabooyinka daawaynta ka dib sida dhexdhexaadinta, dhaqidda iyo qalajinta ayaa loo baahan yahay. Hadafka tillaabooyinkan daaweyntu waa in meesha laga saaro alkali haraaga ah, dareerayaasha iyo alaabada si loo helo badeecada ugu dambeysa ee la safeeyey.
Hydroxyethyl cellulose ayaa si weyn loogu isticmaalay warshado kala duwan sababtoo ah sifooyinka kiimikada gaarka ah iyo waxqabadka wanaagsan. Gaar ahaan, hydroxyethyl cellulose waxay leedahay milmi biyo wanaagsan, dhumucnaan, xasillooni, samaynta filim-samaynta iyo lubricity, waxaana badanaa loo isticmaalaa meelaha soo socda:
Qalabka dhismaha: Qalabka dhismaha, hydroxyethyl cellulose waxaa inta badan loo isticmaalaa sidii dhumuc iyo biyo haynta walxaha sibidhka ku salaysan iyo walxaha gypsum-ku salaysan. Waxay si wax ku ool ah u wanaajin kartaa waxqabadka dhismaha ee agabka, hagaajinta xajinta biyaha, karti-shaqaynta iyo ka-hortagga hoobiye, waxay kordhisaa wakhtiga furan waxayna hubisaa habsami u socodka dhismaha.
Warshadaha Rinjiga: Rinjiga, hydroxyethyl cellulose waxaa loo isticmaalaa dhumuc ahaan, wakiilka hakadka ah iyo emulsifier si loo hagaajiyo rheology iyo xasiloonida rinjiga, ka hortagga suxulka midabka, iyo kor u qaadida fidsanaanta iyo dhalaalka dahaarka.
Waxyaabaha la isku qurxiyo iyo alaabta daryeelka shakhsi ahaaneed: Qurxinta, hydroxyethyl cellulose waxaa badanaa loo isticmaalaa dhumuc ahaan, filim hore iyo qoyaan. Waxay ku siin kartaa alaabooyinka leh dareen wanaagsan, waxay hagaajin kartaa xasilloonida alaabta iyo ku dhegganaanshaha, waxayna kor u qaadi kartaa saamaynta qoyaanka.
Warshadaha dawooyinka: Beerta dawooyinka, hydroxyethyl cellulose waxa loo isticmaalaa dawo ahaan diyaarinta dawooyinka. Iyada oo qayb ka ah kiniinnada sii-daynta joogtada ah, dahaarka filimada, iwm., waxay xakameyn kartaa heerka sii deynta daawooyinka waxayna hagaajin kartaa xasilloonida iyo bioavailability daawooyinka.
Warshadaha cuntada: Warshadaha cuntada, hydroxyethyl cellulose waxa loo isticmaalaa cunto lagu daro si ay kaalin uga qaadato dhumucyada, emulsification iyo xasilinta. Waxaa si weyn loogu isticmaalaa cabitaannada, xawaashka, waxyaabaha caanaha laga sameeyo iyo cuntooyinka kale si loo hagaajiyo dhadhanka iyo dhadhanka alaabta.
Hydroxyethyl cellulose sidoo kale waxay leedahay codsiyo muhiim ah oo ku saabsan soo saarista saliidda, samaynta waraaqaha, daabacaadda dharka iyo warshadaha midabaynta. Soo saarista saliidda, hydroxyethyl cellulose waxa loo isticmaalaa dhumuc iyo xasiliye qodista dareeraha, taas oo wanaajin karta awoodda hakinta dareeraha qodista kana hortagayso burburka gidaarka. Warshadaha warqad-samaynta, waxa loo isticmaalaa sidii wakiilka haynta iyo walaxda xoojinta si loo hagaajiyo xoogga iyo cimriga warqadda. Daabacaadda dharka iyo dheehidda, hydroxyethyl cellulose waxaa loo isticmaalaa dhumuc ahaan si ay u caawiso daabacaadda iyo rinjiyeynta si siman oo loo qaybiyo oo loo hagaajiyo tayada daabacaadda iyo midabaynta.
Hydroxyethyl cellulose waxaa laga helaa cellulose dabiiciga ah iyada oo loo marayo falcelin kiimiko oo taxane ah. Codsigeeda ballaaran ma aha oo kaliya sababtoo ah sifooyinka wanaagsan ee jirka iyo kiimikada, laakiin sidoo kale sababtoo ah waxay ku siin kartaa xalal kala duwan oo warshado badan si ay u daboolaan baahiyo farsamo oo kala duwan.
Waqtiga boostada: Agoosto-13-2024