mid. Farqiga u dhexeeya kuwa la qaldayhydroxypropyl methylcellulose (HPMC)iyo hydroxypropyl methylcellulose saafi ah (HPMC)
1. Muuqaal: hydroxypropyl methylcellulose HPMC saafi ah wuxuu u muuqdaa mid jilicsan wuxuuna leeyahay cufnaan hoose, oo u dhaxaysa 0.3-0.4g/ml; hydroxypropyl methylcellulose HPMC oo la qallajiyey ayaa leh dareere wanaagsan wuxuuna dareemayaa culeys, waxaana jira farqi weyn oo muuqaalka ah marka loo eego badeecada dhabta ah.
2. Xaaladda: Budada saafiga ah ee hydroxypropyl methylcellulose HPMC waa mid fiiqan oo ku jirta mikroskoob ama muraayad weynaynaysa; halka hydroxypropyl methylcellulose HPMC ee la qurxiyey lagu arki karo sida adag ama kiristaalo iyadoo la adeegsanayo mikroskoob ama muraayad weynaynaysa.
3. Ur: hydroxypropyl methylcellulose HPMC saafi ah ma urin karo urta ammonia, istaarijka iyo khamriga; hydroxypropyl methylcellulose HPMC ee la qasay waxay urin kartaa nooc kasta oo ur ah, xitaa haddii aysan dhadhan lahayn, waxay dareemi doontaa culeys.
4. Xal biyood: Xal biyood saafi ah oo hydroxypropyl methylcellulose HPMC ah waa mid cad, gudbin iftiin sare leh, heerka haynta biyaha ≥ 97%; xalka biyaha ee hydroxypropyl methylcellulose HPMC ee la qalajiyey waa mid aan miridh lahayn, heerka haynta biyuhuna way adag tahay in la gaaro 80%.
Marka labaad, haynta biyaha ee hydroxypropyl methylcellulose HPMC, waxay kala saartaa faa'iidooyinka iyo khasaarooyinka:
Haynta biyaha ee methyl cellulose ether xaaladaha heerkulka sare waa tilmaame muhiim ah oo lagu kala saaro tayada methyl cellulose ether. Arrimaha sida heerkulka hawada, heerkulka iyo xawaaraha cadaadiska dabaysha ayaa saameyn doona heerka isbeddelka biyaha ee weelka sibidhka iyo alaabada ku salaysan gypsum. Sidaa darteed, xilliyo kala duwan, waxaa jira kala duwanaansho ku saabsan saamaynta haynta biyaha ee alaabada leh isla xaddiga HPMC lagu daray. Dhismaha gaarka ah, saameynta haynta biyaha ee slurry-ka waxaa lagu hagaajin karaa iyadoo la kordhinayo ama la dhimayo xaddiga HPMC lagu daray. Badeecadaha HPMC ee hydroxypropyl methylcellulose ee aadka u fiican ayaa si wax ku ool ah u xallin kara dhibaatada haynta biyaha heerkulka sare.
Methylcellulose tayo sare leh ayaa si siman oo wax ku ool ah loogu kala firdhin karaa hoobiye sibidh iyo alaabada ku salaysan gypsum, waxayna duubi kartaa dhammaan walxaha adag, waxayna samayn kartaa filim qoyn ah, qoyaanka ku jira saldhigga ayaa si tartiib tartiib ah loo sii daayaa muddo dheer, falgalka aan dabiiciga ahayn ee walaxda gelled wuxuu hubiyaa xoogga isku xidhka iyo xoogga cadaadiska ee walaxda. hydroxypropyl methylcellulose HPMC tayo sare leh, isku mid ahaanshaheeda aad ayuu u fiican yahay, kooxaha methoxy iyo hydroxypropoxy si siman ayaa loogu qaybiyaa silsiladda molecular cellulose, waxay kordhin kartaa oksijiinta ku jirta hydroxyl iyo ether Awoodda atamka ay ula xiriiraan biyaha si ay u sameeyaan xidhmooyin hydrogen ah waxay biyaha xorta ah u rogaan biyo xiran, sidaas darteed si wax ku ool ah u xakameeyaan uumiga biyaha ee ay keento cimilada heerkulka sare iyo gaarista haynta biyaha sare.
Sidaa darteed, dhismaha xagaaga ee heerkulka sare leh, si loo gaaro saameynta haynta biyaha, waxaa lagama maarmaan ah in lagu daro alaabada HPMC ee tayada sare leh tiro ku filan sida ku xusan qaacidada, haddii kale, waxaa jiri doona fuuq-celin ku filan, xoog yaraan, dildilaac, godad iyo daadasho ay keento dhibaatooyin qalajin xad dhaaf ah, laakiin sidoo kale waxay kordhin doontaa dhibka dhismaha ee shaqaalaha. Marka heerkulku hoos u dhaco, xaddiga biyaha HPMC ee lagu daray ayaa si tartiib tartiib ah loo dhimi karaa, isla saameynta haynta biyahana waa la gaari karaa.
3. Kala dirida hydroxypropyl methylcellulose HPMC
Warshadaha dhismaha, hydroxypropyl methylcellulose HPMC badanaa waxaa lagu shubaa biyo dhexdhexaad ah, badeecada HPMC-na waa la milmaa kaligeed si loo qiimeeyo heerka milmida. Ka dib marka la dhigo biyo dhexdhexaad ah oo keliya, badeecada si dhakhso ah u ururta iyada oo aan kala firdhin waa badeeco aan lahayn daaweyn dusha sare ah; ka dib marka la dhigo biyo dhexdhexaad ah oo keliya, badeecada kala firdhi karta oo aan isku urursan karin waa badeeco leh daaweyn dusha sare ah. Marka dusha sare ee aan la daaweyn hydroxypropyl methylcellulose HPMC ay keligeed milmaan, walaxdeeda keli ah ayaa si dhakhso ah u milanta oo sameysa filim si dhakhso ah, taasoo keenta in biyuhu aysan mar dambe gelin walxaha kale, taasoo keenta isku-darka iyo isku-darka, taas oo hadda loo yaqaan kala-baxa gaabis ah ee badeecada suuqa.
Qaybaha wax soo saarka HPMC ee lagu daweeyay dusha sare ee hydroxypropyl methylcellulose, biyo dhexdhexaad ah, qaybo gaar ah ayaa la kala firdhin karaa iyada oo aan la isku ururin, laakiin isku-dhafka badeecaddu isla markiiba ma noqon doono. Ka dib marka la qooyo muddo cayiman, qaab-dhismeedka kiimikada ee daawaynta dusha sare waa la burburiyaa, biyuhuna waxay milmi karaan qaybaha HPMC. Waqtigan xaadirka ah, qaybaha wax soo saarka si buuxda ayaa loo kala firdhiyey oo waxay nuugeen biyo ku filan, sidaa darteed badeecaddu ma isku ururin doonto ama ma isku ururin doonto ka dib marka la kala diro. Xawaaraha kala-baxa iyo xawaaraha kala-baxa waxay ku xiran yihiin heerka daaweynta dusha sare. Haddii daaweynta dusha sare ay yar tahay, xawaaraha kala-baxa waa mid gaabis ah xawaaraha kala-baxana waa mid degdeg ah; halka badeecada leh daaweynta dusha sare ee qoto dheer ay leedahay xawaare kala-baxa oo degdeg ah iyo xawaare isku-dhejin oo gaabis ah. Haddii aad rabto inaad ka dhigto taxanahan alaabada si dhakhso ah u milmi doonta xaaladdan, waxaad hoos u dhigi kartaa xaddi yar oo walxo alkaline ah marka ay keligood milmaan. Suuqa hadda jira waxaa badanaa loogu yeeraa alaabada degdega ah. Astaamaha alaabada HPMC ee dusha sare lagu daweeyay waa: xalka biyaha, walxaha way isku faafi karaan, si dhakhso ah ayay u milmi karaan xaalad alkaline ah, waxayna si tartiib tartiib ah ugu milmi karaan xaalad dhexdhexaad ah oo aashito ah.
Astaamaha hydroxypropyl methylcellulose HPMC ee aan la daaweyn waa: hal walxood ayaa si dhakhso ah ugu milma xaaladaha aashitada, alkaline, iyo dhexdhexaadka ah, laakiin ma kala firdhi karaan qaybaha dareeraha, taasoo keenta isku-ururin iyo isku-ururin. Hawlgalka dhabta ah, ka dib kala firdhinta jireed ee taxanahan alaabada iyo walxaha adag sida budada caagga ah, sibidhka, ciidda, iwm., heerka kala firdhintu aad ayuu u dhakhso badan yahay, mana jiro isku-ururin ama isku-ururin. Marka loo baahdo in si gaar ah loo milmo alaabada HPMC, taxanahan alaabada waa in si taxaddar leh loo isticmaalaa, maadaama ay isku-ururin doonto oo ay isku-ururin doonto. Haddii loo baahdo in si gaar ah loo milmo badeecada hydroxypropyl methylcellulose HPMC ee aan dusha sare lagu daweyn, waxay u baahan tahay in si isku mid ah loogu kala firdhiyo biyo kulul oo 95°C ah, ka dibna la qaboojiyo si loo milmo.
Hawlgalka wax soo saarka dhabta ah, taxanahan badeecadaha badanaa wuu milmaa ka dib marka la kala firdhiyo walxaha kale ee adag marka la eego xaaladaha alkaline, heerka kala firdhistiisuna kama duwana kan alaabada aan la daaweyn. Waxa kale oo uu ku habboon yahay in loo isticmaalo alaabada keligood milma, iyada oo aan la dubin ama la karin. Qaabka gaarka ah ee badeecada waxaa lagu dooran karaa iyadoo loo eegayo heerka kala firdhinta ee uu u baahan yahay dhismaha.
Inta lagu jiro hawsha dhismaha, ha ahaato hoobiye sibidh ah ama slurry ku salaysan gypsum, intooda badan waa nidaamyo alkaline ah, xaddiga HPMC ee lagu darayna aad buu u yar yahay, kaas oo si siman loogu kala firdhin karo walxahan. Marka biyaha lagu daro,HPMCsi dhakhso ah ayuu u milmi doonaa.
Waqtiga boostada: Abriil-26-2024