Cellulose makamaka imagwira ntchito zitatu zokulitsa, kusunga madzi ndikumanga mumatope ndi utoto.
Kukhuthala: Ma cellulose amatha kukhuthala kuti ayimitse ndikusunga yunifolomu ya yankho mmwamba ndi pansi, ndikupewa kugwa.
Kusungirako madzi: Pangani matope ndi utoto kuti ziume pang'onopang'ono, ndipo thandizani zinthu monga phulusa ndi calcium kuti zigwire ntchito pansi pa madzi.
Kumanga: Ma cellulose ali ndi mphamvu yopangira mafuta, zomwe zimatha kupanga matope ndi zokutira kukhala ndi zomangamanga zabwino.
1. Methyl cellulose (MC)
Thonje woyengedwa akagwiritsidwa ntchito ndi alkali, cellulose ether imapangidwa kudzera muzochita zingapo ndi methane chloride ngati etherification agent.Nthawi zambiri, kuchuluka kwa m'malo ndi 1.6 ~ 2.0, ndipo kusungunuka kwake kumasiyananso ndi magawo osiyanasiyana olowa m'malo.Ndi ya non-ionic cellulose ether.
(1) Methylcellulose imasungunuka m'madzi ozizira, ndipo zimakhala zovuta kusungunuka m'madzi otentha.Njira yake yamadzimadzi imakhala yokhazikika pa pH = 3 ~ 12.Iwo ali ngakhale bwino ndi wowuma, guar chingamu, etc. ndi surfactants ambiri.Pamene kutentha kufika kutentha kwa gelation, gelation imachitika.
(2) Kusungidwa kwa madzi kwa methyl cellulose kumadalira kuchuluka kwake, kukhuthala, kukongola kwa tinthu ndi kusungunuka kwake.Nthawi zambiri, ngati kuchuluka kwake kuli kwakukulu, fineness ndi yaying'ono, ndipo mamasukidwe ake ndiakuluakulu, kuchuluka kwa kusunga madzi kumakhala kwakukulu.Pakati pawo, kuchuluka kwa kuwonjezera kumakhudza kwambiri kuchuluka kwa kusungirako madzi, ndipo msinkhu wa viscosity suli wofanana mwachindunji ndi mlingo wa kusunga madzi.The Kusungunuka mlingo makamaka zimadalira mlingo wa padziko kusinthidwa kwa mapadi particles ndi tinthu fineness.Pakati pa ma cellulose ethers omwe ali pamwambawa, methyl cellulose ndi hydroxypropyl methyl cellulose ali ndi milingo yayikulu yosungira madzi.
(3) Kusintha kwa kutentha kudzakhudza kwambiri kuchuluka kwa madzi osungira madzi a methyl cellulose.Nthawi zambiri, kutentha kumapangitsa kuti madzi asamasungidwe kwambiri.Ngati kutentha kwa matope kupitirira 40 ° C, kusungirako madzi kwa methyl cellulose kudzachepetsedwa kwambiri, zomwe zimakhudza kwambiri kupanga matope.
(4) Methyl cellulose imakhudza kwambiri magwiridwe antchito komanso kumamatira kwamatope.“Kumatira” pano kukutanthauza mphamvu yomatira yomwe imamveka pakati pa chida cha wogwiritsa ntchito ndi gawo lapansi la khoma, ndiko kuti, kukana kukameta ubweya wa matope.Zomatira ndizokwera kwambiri, kukana kukameta ubweya wa matope ndi kwakukulu, ndipo mphamvu zomwe ogwira ntchito amafunikira pakugwiritsa ntchito ndizokulirapo, ndipo ntchito yomanga matope ndi yosauka.Methyl cellulose adhesion ali pamlingo wocheperako muzinthu za cellulose ether.
2. Hydroxypropylmethylcellulose (HPMC)
Hydroxypropyl methylcellulose ndi mitundu ya cellulose yomwe kutulutsa kwake ndikugwiritsa ntchito kwakhala kukuchulukirachulukira m'zaka zaposachedwa.Ndi cellulose yopanda ionic yosakaniza ether yopangidwa kuchokera ku thonje woyengedwa pambuyo pa alkalization, pogwiritsa ntchito propylene oxide ndi methyl chloride monga etherification agent, kupyolera muzotsatira zingapo.Mlingo wolowa m'malo nthawi zambiri ndi 1.2 ~ 2.0.Katundu wake ndi wosiyana chifukwa cha kuchuluka kwa methoxyl ndi hydroxypropyl.
(1) Hydroxypropyl methylcellulose imasungunuka mosavuta m'madzi ozizira, ndipo imakumana ndi zovuta pakusungunuka m'madzi otentha.Koma kutentha kwake kwa gelation m'madzi otentha ndikokwera kwambiri kuposa kwa methyl cellulose.Kusungunuka m'madzi ozizira kumakhalanso bwino kwambiri poyerekeza ndi methyl cellulose.
(2) Kukhuthala kwa hydroxypropyl methylcellulose kumakhudzana ndi kulemera kwake kwa mamolekyulu, ndipo kukula kwake kwa molekyulu kumapangitsa kukhuthala kwamphamvu.Kutentha kumakhudzanso kukhuthala kwake, pamene kutentha kumawonjezeka, kukhuthala kumachepa.Komabe, kukhuthala kwake kwakukulu kumakhala ndi kutentha kochepa kuposa methyl cellulose.Yankho lake ndi lokhazikika likasungidwa kutentha.
(3) Kusungidwa kwa madzi kwa hydroxypropyl methylcellulose kumadalira kuchuluka kwake, kukhuthala kwake, ndi zina zambiri, ndipo kuchuluka kwa madzi osungiramo madzi owonjezera omwewo ndi apamwamba kuposa a methyl cellulose.
(4) Hydroxypropyl methylcellulose ndi yokhazikika ku asidi ndi alkali, ndipo njira yake yamadzimadzi imakhala yokhazikika pa pH = 2 ~ 12.Madzi a caustic ndi laimu sakhala ndi zotsatira zochepa pa ntchito yake, koma alkali amatha kufulumizitsa kusungunuka kwake ndikuwonjezera kukhuthala kwake.Hydroxypropyl methylcellulose ndi yokhazikika ku mchere wamba, koma pamene mchere wa mchere uli wambiri, kukhuthala kwa hydroxypropyl methylcellulose solution kumawonjezeka.
(5) Hydroxypropyl methylcellulose akhoza kusakaniza ndi madzi sungunuka polima mankhwala kupanga yunifolomu ndi apamwamba mamasukidwe akayendedwe njira.Monga polyvinyl mowa, wowuma ether, masamba chingamu, etc.
(6) Hydroxypropyl methylcellulose imakhala ndi kukana bwino kwa enzyme kuposa methylcellulose, ndipo kuthekera kwa kuwonongeka kwa enzymatic kwa yankho lake ndikotsika kuposa methylcellulose.Kumamatira kwa hydroxypropyl methylcellulose pakumanga matope ndikokwera kuposa methylcellulose.
3. Hydroxyethyl cellulose (HEC)
Amapangidwa kuchokera ku thonje loyengedwa lopangidwa ndi alkali, ndipo amachita ndi ethylene oxide ngati etherification agent pamaso pa acetone.Mlingo wolowa m'malo nthawi zambiri ndi 1.5 ~ 2.0.Ili ndi hydrophilicity yamphamvu ndipo ndiyosavuta kuyamwa chinyezi.
(1) Hydroxyethyl cellulose imasungunuka m'madzi ozizira, koma ndizovuta kusungunuka m'madzi otentha.Yankho lake ndi khola pa kutentha popanda gelling.Ikhoza kugwiritsidwa ntchito kwa nthawi yaitali pansi pa kutentha kwakukulu mumatope, koma kusungirako madzi kumakhala kochepa kusiyana ndi methyl cellulose.
(2) Ma cellulose a Hydroxyethyl ndi okhazikika ku acid ndi zamchere.Alkali imatha kufulumizitsa kusungunuka kwake ndikuwonjezera kukhuthala kwake pang'ono.Kuwonongeka kwake m'madzi kumakhala koyipa pang'ono kuposa methyl cellulose ndi hydroxypropyl methyl cellulose..
(3) Ma cellulose a Hydroxyethyl ali ndi ntchito yabwino yotsutsa-sag pamatope, koma amakhala ndi nthawi yayitali yochepetsera simenti.
(4) Magwiridwe a hydroxyethyl cellulose opangidwa ndi mabizinesi apakhomo ndi otsika kwambiri kuposa a methyl cellulose chifukwa chokhala ndi madzi ambiri komanso phulusa lalitali.
4. Carboxymethyl cellulose (CMC)
Ionic cellulose ether imapangidwa kuchokera ku ulusi wachilengedwe (thonje, etc.) pambuyo pothandizidwa ndi alkali ndikugwiritsidwa ntchito ngati etherification agent kudzera munjira zingapo zamankhwala.Mlingo wolowa m'malo nthawi zambiri ndi 0.4 ~ 1.4, ndipo magwiridwe ake amakhudzidwa kwambiri ndi kuchuluka kwa kulowetsedwa.
(1) Carboxymethyl cellulose imakhala ndi hygroscopic, ndipo imakhala ndi madzi ambiri ikasungidwa nthawi zambiri.
(2) Carboxymethyl cellulose amadzimadzi njira sapanga gel osakaniza, ndipo mamasukidwe akayendedwe amachepetsa ndi kuwonjezeka kutentha.Kutentha kukadutsa 50 ° C, kukhuthala kwake sikungasinthe.
(3) Kukhazikika kwake kumakhudzidwa kwambiri ndi pH.Nthawi zambiri, itha kugwiritsidwa ntchito mumatope opangidwa ndi gypsum, koma osati mumatope opangidwa ndi simenti.Zikakhala zamchere kwambiri, zimataya kukhuthala.
(4) Kusunga madzi ake ndikotsika kwambiri kuposa methyl cellulose.Imalepheretsa matope a gypsum ndipo imachepetsa mphamvu zake.Komabe, mtengo wa carboxymethyl cellulose ndi wotsika kwambiri kuposa wa methyl cellulose
Udindo wa hydroxypropyl methylcellulose mu makampani zokutira: Chifukwa HPMC ili ndi katundu wofanana ndi ma ether ena osungunuka m'madzi, imatha kugwiritsidwa ntchito ngati chopangira filimu, thickener, emulsifier ndi stabilizer mu utoto wa emulsion ndi zigawo za penti zosungunuka ndi madzi.wothandizira, etc., kotero kuti zokutira zikhale ndi kukana kwabwino kuvala.Kukhazikika ndi kumamatira, komanso kukhathamira kwapamwamba, kukhazikika kwa asidi ndi alkali, komanso kugwirizana ndi utoto wazitsulo.Chifukwa chakuti gel osakaniza a HPMC ndi apamwamba kuposa a MC, kukana kwake kwa kukokoloka kwa bakiteriya kumakhalanso kolimba kuposa ma cellulose ethers, kotero angagwiritsidwe ntchito ngati thickener kwa utoto wa emulsion wamadzi.HPMC ali wabwino mamasukidwe akayendedwe kusunga bata, ndipo ali dispersibility kwambiri, choncho makamaka oyenera ngati dispersant mu zokutira emulsified.
Nthawi yotumiza: Mar-04-2023