Hydroxypropyl methylcelluloseyog ib qho cellulose ether uas tshwm sim ntuj, uas tsis ua teeb meem rau tib neeg lub cev. Txawm li cas los xij, cov ntaub ntawv raw ntawm paj rwb linters thiab HPMC siv hauv lub Hoobkas yog txhua lub ntsej muag, vim qhov no yuav muaj cov nyhuv ntawm hmoov av, thiab lwm tus tsis ua teeb meem.
Hydroxypropyl methylcellulose tsis muaj tshuaj lom. Cellulose suav tias tsim nyog thiab ua tiav los ntawm kev siv cov fibers uas tshwm sim ntuj los ntawm kev sib xyaw alkali, kev sib txuas lus, kev ntxuav, ziab, sib tsoo thiab lwm yam txheej txheem. Yuav tsis ua rau tib neeg muaj kev phom sij rau kev noj qab haus huv.
Hydroxypropyl methyl cellulose, tseem hu ua hypromellose thiab cellulose hydroxypropyl methyl ether, yog ua los ntawm kev siv cov paj rwb cellulose ntshiab heev ua cov khoom siv raw thiab dhau los ntawm kev sib xyaw tshwj xeeb hauv qab cov xwm txheej alkaline.
Kev tsim cov hydroxypropyl methylcellulose: cov paj rwb cellulose uas tau ua kom zoo yog kho nrog lye ntawm 35-40 ℃ rau ib nrab teev, nias, cov cellulose raug tsoo, thiab kev laus yog nqa tawm ntawm 35 ℃ kom ua rau cov alkali fiber tau txais sib npaug. Hauv qhov ntau uas xav tau. Muab cov alkali fiber rau hauv lub lauj kaub etherification, ntxiv propylene oxide thiab methyl chloride ua ntu zus, thiab etherify ntawm 50-80 ℃ rau 5 teev, thiab lub siab sab saud yog li 1.8MPa. Tom qab ntawd ntxiv cov hydrochloric acid thiab oxalic acid kom txaus los ntxuav cov ntaub ntawv hauv dej kub ntawm 90 ° C kom nce qhov loj me thiab ntim. Dehydrate los ntawm centrifugation. Swash kom nruab nrab. Thaum cov dej hauv cov ntaub ntawv tsawg dua 60%, ziab nws nrog cov cua kub ntawm 130 ° C rau cov ntsiab lus tsawg dua 5%.
Cov HPMC uas tsim los ntawm txoj kev siv cov tshuaj yaj siv toluene thiab isopropanol ua cov tshuaj yaj. Yog tias nws raug ntxuav tsis zoo, nws yuav muaj me ntsis tsw ntxhiab tshuav. Qhov no yog teeb meem ntawm cov txheej txheem ntxuav, uas tsis cuam tshuam rau kev siv lossis teeb meem dab tsi.
Hypromellose yog paj rwb zoo uas tsis tshua muaj impregnated nrog kua kom tau txais alkaline cellulose, thiab tom qab ntawd koom nrog cov kuab tshuaj, cov neeg sawv cev etherification, toluene thiab isopropanol rau etherification reactions, thiab yog neutralized, ntxuav, ziab, thiab crushed kom tau txais cov khoom tiav. Phem heev thiab tsw ntxhiab, yog li cov neeg siv tuaj yeem siv nws hauv lub siab ruaj khov.
Hydroxypropyl methylcellulose yuav tsum tau them sai sai rau cov khoom hauv qab no hauv daim ntawv thov:
Hauv cov nyhuv ntawm cov hmoov av nkos, hydroxypropyl methylcellulose tsuas yog ua lub luag haujlwm txhawb nqa, thiab tsis koom nrog hauv kev tshuaj lom neeg. Cov hmoov av nkos raug ntxiv nrog dej thiab muab tso rau ntawm phab ntsa, uas yog kev tshuaj lom neeg. Vim yog kev tsim cov khoom tshiab, cov hmoov av nkos ntawm phab ntsa raug tshem tawm ntawm phab ntsa thiab zom ua hmoov los tsim cov khoom tshiab. Hydroxypropyl methylcellulose tsuas yog khaws dej thiab pab cov calcium grey kom muaj kev teb zoo dua, tab sis nws tsis koom nrog hauv kev teb.
Hydroxypropyl Methyl Cellulose HPMC tsis koom nrog rau hauv kev tshuaj lom neeg, tab sis tsuas yog pab xwb. Ntxiv dej rau cov hmoov av nkos thiab muab tso rau ntawm phab ntsa, nws yog kev tshuaj lom neeg. Vim yog kev tsim cov khoom tshiab, cov hmoov av nkos ntawm phab ntsa raug tshem tawm ntawm phab ntsa thiab zom ua hmoov, thiab tom qab ntawd nws tsis tuaj yeem ua tau, vim tias cov khoom tshiab tau tsim NS. Cov khoom tseem ceeb ntawm cov hmoov calcium grey yog: Ca (OH) 2, sib tov ntawm CaO thiab me me ntawm CaCO3, CaO
H2O=Ca（OH）2-Ca（OH）2 CO2=CaCO3↓ H2O
Cov calcium grey tsim lwm yam nyob rau hauv cov nyhuv ntawm dej thiab CO2 hauv huab cua, thaum HPMC tsuas yog khaws dej thiab pab cov calcium grey kom muaj kev teb zoo dua. Nws tsis koom nrog hauv kev teb.
Hydroxypropyl methyl cellulose muaj ntau yam kev siv. Hauv lub neej txhua hnub, ntau yam khoom tsis tuaj yeem sib cais los ntawm cov txheej txheem tsim khoom. Tom qab ntawd, hauv ntau yam lag luam, qhov cuam tshuam ntawm hydroxypropyl methylcellulose yog dab tsi, kuv yuav piav qhia rau koj, kom koj tuaj yeem tiv thaiv kev siv tsis raug thaum kawm paub.
Ua ntej tshaj plaws, hauv kev lag luam kev tsim kho, nws tuaj yeem suav hais tias yog tus neeg tiv thaiv thiab tus neeg sawv cev khaws dej. Lub mortar mortar yog pumpable, yog li txhua lub mortar qhuav peb siv muaj nws txoj kev koom tes. Tsis tas li ntawd, hauv cov ntaub ntawv tsim kho xws li raw gypsum, plaster, thiab av nkos hmoov, nws tuaj yeem siv ua tus binder, uas tsis tsuas yog ncua lub sijhawm rau kev ua haujlwm, tab sis kuj ua rau cov xim pleev xim ntau dua. Hauv marble, nplaum ceramic vuas, molecular compound yas kho kom zoo nkauj, nws tuaj yeem siv ua tus txhim kho adhesion, thiab lwm yam. Nws tuaj yeem hais tias hydroxypropyl methyl cellulose yog qhov nto moo tshaj plaws rau nws qhov kev hloov pauv hauv cov ntaub ntawv tsim kho.
Hauv lwm yam lag luam, xws li kev tsim cov khoom siv porcelain thiab cov tais diav av nplaum, nws tuaj yeem siv ua cov nplaum rau kev tsim cov khoom siv porcelain thiab cov tais diav av nplaum; hauv kev lag luam lacquer thiab kev luam ntawv number case, nws tuaj yeem siv ua cov hmoov xoob, cov khoom ua kom tuab, cov khoom ruaj khov, thiab txawm tias vim nws tuaj yeem ua ke nrog cov organic Solvent lossis dej sib xyaw zoo nkauj, thiab tuaj yeem siv ua cov xim tshem tawm hauv kev tsim cov yas molecular compound, nrog rau cov khoom ua kom mos, cov neeg sawv cev tso pwm, cov roj nplua nyeem, thiab lwm yam; hauv kev tsim cov polyvinyl chloride, nws suav tias yog cov hmoov xoob.
Cov khoom ua los ntawm hydroxypropyl methylcellulose yog siv dav hauv kev ua kom tshiab ntawm cov txiv hmab txiv ntoo thiab zaub, tshuaj, tawv tsiaj thiab kev lag luam textile. Nws muaj kev nyab xeeb thiab tsis muaj tshuaj lom, tsis ua rau khaus rau tib neeg lub cev cov ntaub so ntswg thiab tawv nqaij, thiab tuaj yeem siv ua cov khoom noj ntxiv. Txawm li cas los xij, qhov xwm txheej tiag tiag ntawm qhov teeb meem, nws cov hmoov av yuav ua rau muaj kuab paug rau huab cua, thiab nws tsis muaj txiaj ntsig zoo rau kev saib xyuas ntawm daim tawv nqaij kom cais nws ntawm hluav taws kom tsis txhob tawg.
kev khaws dej
Cov hydroxypropyl methylcellulose tshwj xeeb rau kev tsim kho tiv thaiv kev siv dej ntau dhau los ntawm cov substrate, thiab cov dej yuav tsum khaws cia rau hauv plaster ntau li ntau tau thaum lub sijhawm uas gypsum tau teeb tsa tag nrho. Cov khoom tshwj xeeb no hu ua kev khaws dej thiab yog qhov sib piv ncaj qha rau qhov viscosity ntawm cov kua hydroxypropyl methylcellulose siv rau kev tsim kho hauv plaster. Qhov viscosity ntawm cov kua ntau dua, qhov kev paub txog kev khaws dej ntau dua.
Tiv thaiv kev sagging
Cov mortar uas muaj cov yam ntxwv tshwj xeeb ntawm kev tiv thaiv kev sagging tuaj yeem siv nrog cov txheej tuab dua yam tsis sagging, uas kuj txhais tau tias cov mortar nws tus kheej tsis hloov nws cov poj niam txiv neej, txwv tsis pub nws yuav swb thaum lub sijhawm pib tsim kho.
Txo qhov viscosity thiab ua kom yooj yim rau kev tsim kho
Tom qab ntxiv ntau yam khoom siv hydroxypropyl methylcellulose uas tsim tshwj xeeb rau kev tsim kho, cov plaster gypsum ntsuab uas muaj qhov viscosity me ntsis tuaj yeem tsim tau. Thaum nws pom zoo thiab qib viscosity qis dua ntawm kev tsim kho hydroxypropyl methylcellulose siv, qib viscosity raug txo qis thiab kev tsim kho yooj yim dua. Txawm li cas los xij, kev khaws dej ntawm hydroxypropyl methylcellulose rau kev tsim kho viscosity qis yog qhov tsis muaj zog, thiab nws yog qhov tsim nyog los nce qhov ntau ntxiv.
Tus nqi sib xws ntawm cov yas
Yog tias muaj cov av qhuav ntau npaum li cas los xij, nws yuav pheej yig dua los tsim cov av ntub ntau dua, uas tuaj yeem ua tiav los ntawm kev ntxiv me ntsis dej thiab npuas. Txawm li cas los xij, yog tias cov dej thiab npuas ntev dhau, lub zog yuav tsis zoo.
Lub sijhawm tshaj tawm: Plaub Hlis-26-2024