Hydroxypropyl methylcellulosendi ether ya cellulose yomwe imapezeka mwachilengedwe, yomwe siivulaza thupi la munthu. Komabe, zipangizo zopangira thonje ndi HPMC zomwe zimagwiritsidwa ntchito mufakitale zonse ndi za nkhope, chifukwa izi zidzakhala ndi mphamvu ya fumbi, ndipo zina sizovulaza.
Hydroxypropyl methylcellulose si poizoni. Cellulose imaonedwa kuti ndi yoyenera ndipo imakonzedwa pogwiritsa ntchito ulusi wachilengedwe kudzera mu alkali fusion, grafting response, kutsuka, kuumitsa, kupera ndi njira zina. Siziika pachiwopsezo thanzi la anthu.
Hydroxypropyl methyl cellulose, yomwe imadziwikanso kuti hypromellose ndi cellulose hydroxypropyl methyl ether, imapangidwa pogwiritsa ntchito cellulose ya thonje yoyera kwambiri ngati zopangira ndipo imapangidwa ndi etherification yapadera pansi pa mikhalidwe ya alkaline.
Kupanga kwa hydroxypropyl methylcellulose: cellulose yokonzedwa bwino imachiritsidwa ndi lye pa 35-40℃ kwa theka la ola, kufinyidwa, cellulose imaphwanyidwa, ndipo kukalamba kumachitika pa 35℃ kuti ulusi wa alkali womwe wapezeka ukhale wofanana ndi polymer. Mkati mwa kuchuluka kofunikira. Ikani ulusi wa alkali mu ketulo ya etherification, onjezerani propylene oxide ndi methyl chloride motsatizana, ndikutentha pa 50-80℃ kwa maola 5, ndipo kuthamanga kwapamwamba ndi pafupifupi 1.8MPa. Kenako onjezerani kuchuluka koyenera kwa hydrochloric acid ndi oxalic acid kuti mutsuke zinthuzo m'madzi otentha pa 90°C kuti muwonjezere kukula ndi kuchuluka. Sungunulani madzi pogwiritsa ntchito centrifugation. Sambitsani mpaka kusakhala ndi mpweya woipa. Madzi akakhala ochepera 60%, aume ndi mpweya wotentha pa 130°C mpaka ochepera 5%.
HPMC yopangidwa ndi njira yosungunulira imagwiritsa ntchito toluene ndi isopropanol ngati chosungunulira. Ngati chatsukidwa bwino kwambiri, chimakhala ndi fungo lotsala pang'ono. Ili ndi vuto la njira yotsukira, lomwe silikhudza kugwiritsa ntchito kapena vuto lililonse.
Hypromellose ndi thonje loyengedwa bwino lomwe nthawi zambiri silimalowetsedwa ndi madzi kuti lipange alkaline cellulose, kenako limagwira ntchito mu zosungunulira, zinthu zoyeretsera, toluene ndi isopropanol kuti lipange etherification, ndipo limachotsedwa, kutsukidwa, kuumitsidwa, ndi kuphwanyidwa kuti lipeze zinthu zomalizidwa. Ndi loipa kwambiri komanso lonunkha, kotero ogwiritsa ntchito amatha kuligwiritsa ntchito ali ndi maganizo abwino.
Hydroxypropyl methylcellulose iyenera kulabadira zinthu zotsatirazi zomwe zimagwiritsidwa ntchito:
Pakukhudza kwa ufa wa matope, hydroxypropyl methylcellulose imangogwira ntchito yothandizira, ndipo sichita nawo chilichonse chokhudzana ndi mankhwala. Ufa wa matopewo umawonjezedwa ndi madzi ndikuyikidwa pakhoma, zomwe ndi zotsatira za mankhwala. Chifukwa cha kupangika kwa zinthu zatsopano, ufa wa matope womwe uli pakhoma umachotsedwa pakhoma ndikuphwanyidwa kukhala ufa kuti apange zinthu zatsopano. Hydroxypropyl methylcellulose imangosunga madzi ndipo imathandiza calcium yaimvi kuti ikhale ndi yankho labwino, koma sichita nawo chilichonse chokhudzana ndi yankho.
Hydroxypropyl Methyl Cellulose HPMC sichita nawo chilichonse chokhudzana ndi mankhwala, koma imathandiza kokha. Onjezerani madzi ku ufa wa matope ndikuuyika pakhoma, ndi njira yogwirizana ndi mankhwala. Chifukwa cha kupangika kwa zinthu zatsopano, ufa wa matope pakhoma umachotsedwa pakhoma ndikuphwanyidwa kukhala ufa, kenako sizingatheke, chifukwa zinthu zatsopano zapangidwa NS. Zigawo zazikulu za ufa wa calcium imvi ndi izi: Ca(OH)2, chisakanizo cha CaO ndi CaCO3 yochepa, CaO3
H2O=Ca（OH）2-Ca（OH）2 CO2=CaCO3↓ H2O
Kalisiyamu imvi imapanga zinthu zina pogwiritsa ntchito madzi ndi CO2 mumlengalenga, pomwe HPMC imasunga madzi okha ndipo imathandiza kalisiyamu imvi kuti ikhale ndi yankho labwino. Sichita nawo yankho lililonse.
Hydroxypropyl methyl cellulose imagwiritsidwa ntchito m'njira zosiyanasiyana. Pa moyo watsiku ndi tsiku, zinthu zambiri sizingasiyanitsidwe ndi njira zopangira. Kenako, m'mafakitale osiyanasiyana, kodi hydroxypropyl methylcellulose imakhudza bwanji, ndikufotokozerani izi, kuti mupewe kugwiritsa ntchito molakwika pamene mukuphunzira.
Choyamba, mumakampani omanga, imatha kuonedwa ngati choletsa komanso chosunga madzi. Chopopera cha matope chimatha kupopedwa, kotero chopopera chonse chouma chomwe timagwiritsa ntchito chimagwira nawo ntchito. Kuphatikiza apo, muzinthu zomangira monga gypsum yosaphika, pulasitala, ndi ufa wamatope, ingagwiritsidwe ntchito ngati chomangirira, chomwe sichimangowonjezera nthawi yogwirira ntchito, komanso chimapangitsa utoto kukhala wosavuta kupakidwa. Mu marble, matailosi a ceramic omatira, zokongoletsa za pulasitiki zophatikizika, ingagwiritsidwe ntchito ngati chowonjezera kumatira, ndi zina zotero. Tinganene kuti hydroxypropyl methyl cellulose ndiyo yotchuka kwambiri chifukwa cha kusinthasintha kwake muzinthu zomangira.
Mu mafakitale ena, monga kupanga zinthu za porcelain ndi zoumba, ingagwiritsidwe ntchito ngati guluu popanga zinthu za porcelain ndi zoumba; mumakampani opanga lacquer ndi kusindikiza inki, ingagwiritsidwe ntchito ngati ufa womasuka, wokhuthala, wokhazikika, komanso chifukwa imatha kusakanikirana ndi organic solvent kapena madzi osakanikirana bwino, ndipo ingagwiritsidwe ntchito ngati chochotsera utoto popanga mapulasitiki okhala ndi mamolekyulu, komanso zofewetsa, zotulutsa nkhungu, mafuta odzola, ndi zina zotero; popanga polyvinyl chloride, imaonedwa ngati ufa womasuka.
Zinthu zopangidwa ndi hydroxypropyl methylcellulose zimagwiritsidwa ntchito kwambiri mu zipatso ndi ndiwo zamasamba zatsopano, mankhwala, zikopa za nyama ndi mafakitale a nsalu. Ndi yotetezeka komanso yopanda poizoni, siikwiyitsa kwambiri ma mucous nembanemba ndi zikopa za thupi la munthu, ndipo ingagwiritsidwenso ntchito ngati chowonjezera pazakudya. Komabe, pankhani yeniyeni, fumbi lake lingayambitse kuipitsidwa kwa mpweya, ndipo sizothandiza pakusamalira khungu kuti lichotsedwe ku moto kuti lisapse.
kusunga madzi
Hydroxypropyl methylcellulose yapadera yomangira imapewa kugwiritsa ntchito madzi mopitirira muyeso ndi substrate, ndipo madzi ayenera kusungidwa mu pulasitala momwe angathere panthawi yomwe gypsum yakhazikika kwathunthu. Kapangidwe kapadera kameneka kamatchedwa kusunga madzi ndipo kamagwirizana mwachindunji ndi kukhuthala kwa yankho la hydroxypropyl methylcellulose lomwe limagwiritsidwa ntchito pomanga pulasitala. Kukhuthala kwa yankho kukakhala kwakukulu, kumakhala kochulukira kusungira madzi.
Woletsa kugwa
Chomangira chokhala ndi makhalidwe apadera oletsa kugwa chingagwiritsidwe ntchito ndi chophimba chokhuthala popanda kugwa, zomwe zikutanthauzanso kuti chomangiracho sichisintha mtundu wake, apo ayi chidzatsika pansi ntchito ikayamba.
Kuchepetsa kukhuthala ndikuthandizira kumanga
Pambuyo powonjezera zinthu zosiyanasiyana za hydroxypropyl methylcellulose zomwe zimapangidwa, pulasitala wobiriwira wa gypsum wokhala ndi mawonekedwe okhuthala pang'ono ukhoza kupangidwa. Ngati zikuwoneka kuti ndizoyenera ndipo hydroxypropyl methylcellulose yokhala ndi kalasi yotsika ya kukhuthala kwa kapangidwe kake ikagwiritsidwa ntchito, kuchuluka kwa kukhuthala kumachepa ndipo kapangidwe kake kumakhala kosavuta. Komabe, kusunga madzi kwa hydroxypropyl methylcellulose kuti pakhale kukhuthala kochepa kumakhala kofooka, ndipo ndikofunikira kuwonjezera kuchuluka kwa kuwonjezera.
Chiŵerengero cha kugwirizana kwa pulasitiki
Pa matope ouma okhazikika, ndi kosavuta kupanga matope onyowa kwambiri, omwe angapezeke powonjezera madzi ndi thovu pang'ono. Komabe, ngati madzi ndi thovulo ndi zazitali kwambiri, mphamvu yake imachepa.
Nthawi yotumizira: Epulo-26-2024