Tayada Hydroxypropyl Methyl Cellulose

Hydroxypropyl methylcellulose ayaa laga sifeeyaa suufka ka dib alkalization, iyadoo la isticmaalayo propylene oxide iyo methyl chloride sida wakiilada etherification, oo ay marto falcelin taxane ah si loo soo saaro cellulose aan-ionic ah oo isku dhafan.Hydroxypropyl methylcellulose waa eter cellulose aan ionic ahayn, muuqaal ahaan, ur aan ur lahayn iyo dhadhan la'aan.Heerka beddelka guud ahaan waa .Sifooyinkeedu way kala duwan yihiin iyadoo ku xidhan saamiga maadada methoxyl iyo ka kooban hydroxypropyl.

Marka hore, marka hore fiiri isku dhafka hydroxypropyl methylcellulose:

Cellulose suufka la safeeyey waxaa lagu daaweeyaa xalalka alkali at 35-40 ° C nus saac, la riixay, iyo cellulose waxaa la miiro at 35 ° C oo si habboon u da'da, si celcelis ahaan heerka polymerization ee fiber alkali helay waa gudaha gudaha baaxadda loo baahan yahay.Geli fiber alkali taangiga etherification, ku dar propylene oxide iyo methyl chloride si isku xigta, etherify at 50-80 ° C ilaa 5 saacadood, iyo cadaadiska ugu badan waa qiyaastii.Ka dib ku dar qadar ku habboon oo ah hydrochloric acid iyo oxalic acid biyaha kulul ee 90 ° C si loo kordhiyo mugga.Fuuqbaxa ku jira centrifuge.Marka qoyaanka maaddadu ay ka hooseyso 60%, ku dhaq si dhexdhexaad ah, ka dibna u qalaji wax ka hooseeya 5% oo leh socodka hawo kulul 130 ° C.Ugu dambayntii waxa lagu burburiyay shaandho 20-mesh ah si loo helo badeecadii dhammaatay.

Astaamaha Alaabta Hydroxypropyl Methyl Cellulose:

1. Hydroxypropyl methylcellulose si fudud ayay ugu milmi kartaa biyo qabow waxayna ku milmi doontaa biyo kulul.Si kastaba ha noqotee, heerkulkeeda gelation ee biyaha kulul aad ayuu uga sarreeyaa kan methylcellulose.Kala dirida biyaha qabow ayaa sidoo kale aad uga roon methyl cellulose.

2. Viscosity of hydroxypropyl methylcellulose waxay la xiriirtaa miisaanka kelli, iyo viscosity waa sarreeyaa marka miisaanka kelli uu weyn yahay.Heerkulka ayaa sidoo kale saameeya viscosity-kiisa, marka heerkulku kordho, viscosity ayaa hoos u dhacaya.Laakiin viscositykeeda sare wuu ka hooseeyaa methyl cellulose.Xalkeedu wuxuu ku degan yahay heerkulka qolka.

Awoodda xajinta biyaha ee hydroxypropyl methylcellulose waxay kuxirantahay qadarka dheeriga ah, viscosity, iwm.

3. Hydroxypropyl methylcellulose waxay ku xasilloon tahay aashitada iyo alkali, iyo xalkeeda aqueous waa mid deggan inta u dhaxaysa pH=2-12.Caustic soodhaha iyo biyaha lime waxay saameyn yar ku leeyihiin hantidooda, laakiin alkali waxay soo dedejin kartaa kala diriskeeda oo wax yar kordhin kartaa viscosity-keeda.Hydroxypropyl methylcellulose waxay ku xasilloon tahay cusbada caadiga ah, laakiin marka xoogga milixdu uu sarreeyo, viscosity ee xalka hydroxypropyl methylcellulose wuxuu u eg yahay inuu kordho.

4. Hydroxypropyl methylcellulose waxaa lagu qasi karaa polymers-ka biyaha-milmi kara si ay u sameeyaan labbis, xal-viscosity sare.Sida aalkolada polyvinyl, ether-ka budada biyaha harada, xanjada khudradda, iwm.

Hydroxypropyl methylcellulose waxay leedahay iska caabin enzyme ka wanaagsan methylcellulose, xalkeeduna aad bay ugu yar tahay inuu enzymatic ahaan hoos u dhaco marka loo eego methylcellulose.

5. Isku-xidhka u dhexeeya hydroxypropyl methylcellulose iyo qaab-dhismeedka hoobiye ayaa ka sarreeya kan methylcellulose.

Hoobiyeyaasha isku dhafan ee qoyan waa sibidhka, wadarta guud ee wanaagsan, wax lagu daro iyo biyaha, iyo qaybo kala duwan ayaa lagu go'aamiyaa iyadoo loo eegayo waxqabadka.Ka dib marka la cabbiro isku darka oo la isku daro saami cayiman oo ku yaal goobta isku dhafka ah, isku dar ah ayaa lagu qaadayaa meesha la isticmaalo iyada oo la raacayo baabuur qaso waxaana lagu kaydiyaa weel gaar ah, isku dhafka qoyan ayaa loo isticmaalaa waqti cayiman.

Sida loo qiimeeyo tayada hydroxypropyl methylcellulose?

Xakamaynta tayada hydroxypropyl methylcellulose waxay inta badan ku xiran tahay laba tilmaame, mid waa heerka beddelka (DS) kan kalena waa daahir.Guud ahaan, sifooyinka carboxymethyl cellulose way ka duwan yihiin haddii heerka beddelka uu ka duwan yahay;Heerka sare ee beddelka, ayaa sii xoogaysanaya milanka, iyo sida wanaagsan ee daahfurnaanta iyo xasilloonida xalka.Marka loo eego warbixinnada la xiriira, daahfurnaanta carboxymethyl cellulose waa mid aad u wanaagsan marka heerka beddelka uu yahay ~, iyo viscosity ee xalkeeda aqueous ayaa sarreeya marka qiimaha pH uu yahay 6-9.Taasi waa in la yiraahdo, si loo cabbiro tayada karboxymethyl cellulose, waxaa lagama maarmaan ah in si fiican loo fahmo heerka beddelka iyo nadiifnimada.Labadan tilmaame ayaa buuxinaya shuruudaha, taas oo macnaheedu yahay in tayadiisu aad u wanaagsan tahay.