Hydroxypropyl methylcellulosendi cellulose ether yochitika mwachilengedwe, yomwe siivulaza thupi la munthu. Komabe, zopangira zopangira thonje ndi HPMC zomwe zimagwiritsidwa ntchito fakitale zonse ndi nkhope, chifukwa izi zidzakhala ndi zotsatira za fumbi, ndipo zina sizovulaza.
Hydroxypropyl methylcellulose si poizoni. Ma cellulose amaonedwa kuti ndi abwino ndipo amakonzedwa pogwiritsa ntchito ulusi wongochitika mwachilengedwe kudzera mu kuphatikiza kwa alkali, kulumikiza kuyankha, kutsuka, kuyanika, kugaya ndi njira zina. Sizingawononge thanzi la anthu.
Hydroxypropyl methyl cellulose, yomwe imadziwikanso kuti hypromellose ndi cellulose hydroxypropyl methyl ether, imapangidwa pogwiritsa ntchito thonje la thonje loyera kwambiri ngati zinthu zopangira komanso kupangidwa ndi etherification yapadera pansi pamikhalidwe yamchere.
Kaphatikizidwe ka hydroxypropyl methylcellulose: thonje woyengedwa wa thonje amathandizidwa ndi lye pa 35-40 ℃ kwa theka la ola, kufinya, mapadi amaphwanyidwa, ndipo ukalamba umachitika pa 35 ℃ kuti upangiri wa alkali upangidwe mofanana polymerized. M'kati mwazofunikira. Ikani ulusi wa alkali mu ketulo ya etherification, onjezerani propylene oxide ndi methyl chloride motsatizana, ndi etherify pa 50-80 ℃ kwa 5h, ndipo kupanikizika kwapamwamba kumakhala pafupifupi 1.8MPa. Kenaka yikani mlingo woyenera wa hydrochloric acid ndi oxalic acid kuti mutsuke zipangizo m'madzi otentha pa 90 ° C kuti muwonjezere kukula ndi voliyumu. Dehydrate ndi centrifugation. Sambani mpaka ku ndale. Pamene madzi omwe ali muzinthuzo ndi osachepera 60%, aume ndi mpweya wotentha wa 130 ° C mpaka osachepera 5%.
HPMC yopangidwa ndi njira yosungunulira imagwiritsa ntchito toluene ndi isopropanol ngati zosungunulira. Ngati chatsukidwa moyipa kwambiri, chimakhala ndi fungo lotsala pang'ono. Ili ndi vuto la kuchapa, zomwe sizimakhudza ntchito kapena vuto lililonse.
Hypromellose ndi thonje woyengedwa kuti kawirikawiri impregnated ndi madzi kupeza zamchere mapadi, ndiyeno nawo zosungunulira, etherification wothandizira, toluene ndi isopropanol chifukwa etherification zimachitikira, ndipo ndi neutralized, kutsukidwa, zouma, ndi wosweka kupeza zomalizidwa. Zoipa kwambiri komanso zonunkhiza, kotero ogwiritsa ntchito amatha kuzigwiritsa ntchito mokhazikika.
Hydroxypropyl methylcellulose ayenera kulabadira zinthu zotsatirazi mukugwiritsa ntchito:
Zotsatira za ufa wamatope, hydroxypropyl methylcellulose imangogwira ntchito yothandizira, ndipo sichichita nawo mankhwala aliwonse. Ufa wamatope umawonjezeredwa ndi madzi ndikuyika pakhoma, zomwe zimakhala ndi mankhwala. Chifukwa cha kupangidwa kwa zinthu zatsopano, ufa wamatope umene uli pakhoma umachotsedwa pakhoma n’kukhala ufa n’kupanga zinthu zatsopano. Hydroxypropyl methylcellulose imangosunga madzi ndipo imathandizira calcium yotuwira kuti ikhale yabwino, koma sichita nawo yankho lililonse.
Hydroxypropyl Methyl Cellulose HPMC satenga nawo mbali pazochita zilizonse zama mankhwala, koma zimangothandiza. Onjezani madzi ku ufa wamatope ndikuwuyika pakhoma, ndizochitika za mankhwala. Chifukwa cha kupangidwa kwa zinthu zatsopano, ufa wamatope pakhoma umachotsedwa pakhoma ndikuyika ufa, ndiyeno sizingatheke, chifukwa zinthu zatsopano zapangidwa NS. Zigawo zazikulu za ufa wotuwa wa calcium ndi: Ca(OH)2, osakaniza a CaO ndi CaCO3, CaO pang'ono.
H2O=Ca(OH)2-Ca(OH)2 CO2=CaCO3↓ H2O
Gray calcium imapanga zinthu zina pansi pa madzi ndi CO2 mumlengalenga, pamene HPMC imangokhala ndi madzi ndipo imathandizira imvi kuti ikhale ndi yankho labwino. Sichita nawo yankho lililonse.
Hydroxypropyl methyl cellulose imakhala ndi ntchito zosiyanasiyana. M'moyo watsiku ndi tsiku, zinthu zambiri sizimasiyanitsidwa ndi kupanga. Ndiye, m'mafakitale osiyanasiyana, ndi zotsatira zotani za hydroxypropyl methylcellulose, ndikufotokozerani, kuti muthe kupewa kugwiritsa ntchito molakwika pamene mukupeza chidziwitso.
Choyamba, m'makampani omangamanga, amatha kuonedwa ngati cholepheretsa komanso chosungira madzi. Mtondo wamatope ndi wopopa, choncho matope onse owuma omwe timagwiritsa ntchito amakhala ndi gawo lake. Kuonjezera apo, muzinthu zomangira monga gypsum yaiwisi, pulasitala, ndi ufa wamatope, ukhoza kugwiritsidwa ntchito ngati chomangira, chomwe sichimangowonjezera nthawi yogwira ntchito, komanso chimapangitsa kuti utoto ukhale wonyezimira. Mu nsangalabwi, zomatira ceramic matailosi, molecular pawiri zokongoletsa pulasitiki, angagwiritsidwe ntchito monga adhesion enhancer, etc. Tinganene kuti hydroxypropyl methyl cellulose ndi wotchuka kwambiri chifukwa cha kusinthasintha mu zipangizo zomangira.
M'mafakitale ena, monga kupanga zadothi ndi mbiya, angagwiritsidwe ntchito ngati zomatira popanga zinthu zadothi ndi mbiya; mu makampani lacquer ndi inki kusindikiza, angagwiritsidwe ntchito ngati lotayirira ufa, thickener, stabilizer, ndipo ngakhale chifukwa akhoza pamodzi ndi organic zosungunulira kapena madzi zikuphatikiza mokongola, ndipo angagwiritsidwe ntchito ngati chochotsa utoto popanga maselo mapulasitiki pawiri. , komanso zofewa, zotulutsa nkhungu, mafuta odzola, etc.; popanga polyvinyl chloride, imatengedwa ngati ufa wotayirira.
Zomwe zimapangidwa ndi hydroxypropyl methylcellulose zimagwiritsidwa ntchito kwambiri popanga zipatso ndi ndiwo zamasamba, mankhwala, zikopa za nyama ndi mafakitale a nsalu. Ndizotetezeka komanso zopanda poizoni, sizikwiyitsa kwambiri mucous nembanemba ndi zikopa, ndipo zitha kugwiritsidwa ntchito ngati chowonjezera cha chakudya. Komabe, muzochitika zenizeni za nkhaniyi, fumbi lake likhoza kuwononga mpweya, ndipo sikupindulitsa kukonzanso khungu kuti lizipatula pamoto kuti lisaphulika.
kusunga madzi
Hydroxypropyl methylcellulose yapadera yomanga imapewa kugwiritsira ntchito madzi mopitirira muyeso ndi gawo lapansi, ndipo madzi ayenera kusungidwa mu pulasitala momwe angathere panthawi yomwe gypsum yakhazikika. Malo apaderawa amatchedwa kusungirako madzi ndipo amafanana mwachindunji ndi kukhuthala kwa hydroxypropyl methylcellulose solution yomwe imagwiritsidwa ntchito pomanga pulasitala. The apamwamba kukhuthala kwa njira yothetsera vutoli, m'pamenenso kukwezera madzi posungira zinachitikira.
Anti-sagging
Mtondo wokhala ndi zida zapadera za anti-sagging ungagwiritsidwe ntchito ndi zokutira zokulirapo popanda kugwedezeka, zomwe zikutanthauza kuti matopewo sasintha jenda, apo ayi adzatsika pomwe ntchito yomanga iyamba.
Chepetsani mamasukidwe akayendedwe ndikuthandizira kumanga
Mukawonjezera zinthu zosiyanasiyana zomanga zenizeni za hydroxypropyl methylcellulose, pulasitala wobiriwira wa gypsum wokhala ndi mawonekedwe owoneka bwino amatha kupangidwa. Zikaonedwa kuti ndizoyenera komanso kalasi yotsika kwambiri ya hydroxypropyl methylcellulose yomanga imagwiritsidwa ntchito, Mlingo wa viscosity umachepetsedwa ndipo kumanga kumakhala kosavuta. Komabe, kusungirako madzi kwa hydroxypropyl methylcellulose pomanga kasupe kakang'ono kumakhala kofooka, ndipo ndikofunikira kuwonjezera kuchuluka kwa kuwonjezera.
Mlingo wa pulasitiki wogwirizana
Kwa matope owuma okhazikika, zimakhala zotsika mtengo kupanga kukula kwamatope, komwe kungapezeke mwa kuwonjezera madzi pang'ono ndi thovu. Komabe, ngati kuchuluka kwa madzi ndi thovu ndi motalika kwambiri, mphamvuyo imawonongeka.
Nthawi yotumiza: Apr-26-2024