Focus on Cellulose ethers

Habka hydroxypropyl methylcellulose dib u dhigista fuuq-celinta sibidhka

soo bandhig

Hydroxypropyl methylcellulose (HPMC) waa eter cellulose ah oo si weyn looga isticmaalo warshadaha kala duwan sida cuntada, daawada, iyo dhismaha sida dhumuc weyn, emulsifier, iyo xasiliye. Warshadaha dhismaha, HPMC waxaa inta badan loo isticmaalaa wax lagu daro walxaha sibidhka ku salaysan si loo gaaro sifooyinka la rabo sida shaqaynta, xajinta biyaha iyo adkeysiga. Daraasaduhu waxay ogaadeen in ku darida HPMC ee alaabta sibidhka ku salaysan ay dib u dhigto habka fuuq-celinta ee sibidhka, ugu dambeyntiina saameynayso horumarinta xoogga alaabta sibidhka ku salaysan.

Saamaynta HPMC ee fuuq-celinta sibidhka

Fuuq-celinta sibidhka waa fal-celin kiimiko oo adag oo ku lug leh falcelinta biyaha leh qaybo sibidh qallalan. Inta lagu jiro habka fuuq-celinta, qaybaha sibidhka waxay la falgalaan biyaha si ay u sameeyaan badeecooyin kala duwan oo fuuq-bax ah, kuwaas oo gacan ka geysta hagaajinta xoogga walxaha ku salaysan sibidhka. Daraasaduhu waxay ogaadeen in ku-darka HPMC ee walxaha ku salaysan sibidhka ay dib u dhigi karto fuuq-celinta sibidhka, taas oo beddeleysa heerka iyo baaxadda horumarka xoogga.

Mid ka mid ah sababaha ugu waaweyn ee dib u dhigista fuuq-celinta sibidhka waa sifooyinka biyaha-haynta ee HPMC. HPMC waa polymer hydrophilic kaas oo nuuga biyaha oo barara si uu u sameeyo qaab-dhismeedka jel u eg. Marka HPMC lagu daro walxaha sibidhka ku salaysan, waxay ka nuugtaa biyaha isku dar ah, si ay u yarayso biyaha bilaashka ah ee loo baahan yahay si loo fuuqeeyo sibidhka. Tani waxay iyaduna hoos u dhigtaa habka fuuq-celinta, maadaama fal-celinta sibidhka ee biyaha ay u baahan tahay biyo ku filan.

Arrin kale oo gacan ka geysata dib u dhigista fuuq-celinta sibidhka ayaa ah ku-kulanka HPMC ee dusha sare ee qaybaha sibidhka. HPMC waxay xidhiidh sare u leedahay qaybaha sibidhka sababtoo ah polarity-keeda. Waxaa lagu dhejin karaa dusha sare ee qaybaha sibidhka waxayna sameeyaan caqabad jireed si loo xaddido xidhiidhka ka dhexeeya molecules biyaha iyo qaybaha sibidhka. Tani waxay iyaduna hoos u dhigtaa fal-celinta sibidhka ee biyaha, taasoo keenta fuuq-celinta sibidhka.

Ku-daridda HPMC ee agabka sibidhka ku salaysan waxay sidoo kale saamayn doontaa nukleation-ka iyo habka korriinka korriinka ee alaabta fuuq-baxa. Fuuq-celinta sibidhka waxay ku lug leedahay samaynta wejiyada crystalline kala duwan, sida calcium silicate hydrate (CSH) iyo calcium hydroxide (CH). HPMC waxay hor istaagi kartaa nukleation-ka iyo korriinka korriinka ee qaar ka mid ah wejiyadan, sii yaraanaya fuuq-baxa sibidhka.

Habka dib u dhigista fuuq-celinta sibidhka

Habka aasaasiga ah ee uu HPMC dib u dhigo fuuq-celinta sibidhka waa samaynta caqabad jidheed oo u dhexeeya qaybaha shabidda iyo biyaha. Marka HPMC lagu kala firdhiyo biyaha, waxay samaysaa matrix jel oo kale ah kaas oo koobi kara qaybo sibidhka oo yarayn kara helitaanka biyo bilaash ah fuuq-celinta sibidhka. Tani waxay markaa hoos u dhigtaa falcelinta sibidhka ee biyaha, taasoo keenaysa dib u dhac ku yimaada horumarinta xoogga walxaha ku salaysan sibidhka.

Hab kale ayaa ah isku-dubbaridka HPMC ee dusha sare ee walxaha sibidhka. HPMC waxay xidhiidh sare u leedahay qaybaha sibidhka sababtoo ah polarity-keeda. Waxaa lagu dhejin karaa dusha sare ee qaybaha sibidhka waxayna sameeyaan caqabad jireed si loo xaddido xidhiidhka ka dhexeeya molecules biyaha iyo qaybaha sibidhka. Tani waxay sii yaraynaysaa falcelinta sibidhka ee biyaha.

HPMC waxa kale oo ay la falgali kartaa qaybaha kala duwan ee sibidhka, sida ions calcium, taas oo saamaynaysa nukleation-ka iyo hababka koritaanka crystal ee alaabta fuuqbaxa. HPMC waxay hor istaagi kartaa nukleation-ka iyo korriinka korriinka ee qaar ka mid ah wejiyadan, sii yaraanaya fuuq-baxa sibidhka.

gabagabadii

Ku-daridda HPMC ee alaabta sibidhka waxay dib u dhigi kartaa fuuq-celinta sibidhka, taas oo beddeleysa heerka iyo baaxadda horumarka xoogga. Habka fuuq-celinta sibidhka ee dib-u-dhaca ayaa inta badan sabab u ah samaynta xannibaad jidheed oo u dhexeeya qaybaha sibidhka iyo biyaha, kaas oo lagu dhajiyo dusha sare ee qaybaha sibidhka oo xannibaya habka koritaanka nucleation iyo crystal ee alaabta fuuqbaxa. Fahamka hababka ay HPMC dib ugu celiso fuuq-celinta sibidhka waxay noo ogolaan kartaa inaan wanaajino isticmaalka HPMC ee walxaha sibidhka si aan u helno sifooyinka la rabo iyadoo la ilaalinayo horumarinta xoogga alaabta sibidhka.


Waqtiga boostada: Oct-24-2023
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