Hydroxypropyl methylcellulose yog sivyog ib txwm tshwm sim cellulose ether, uas tsis muaj teeb meem rau tib neeg lub cev. Txawm li cas los xij, cov ntaub ntawv raw ntawm paj rwb linters thiab HPMC siv nyob rau hauv lub Hoobkas yog tag nrho cov ntsej muag, vim hais tias qhov no yuav muaj cov nyhuv ntawm cov plua plav, thiab lwm yam tsis muaj teeb meem.
Hydroxypropyl methylcellulose yog non-toxic. Cellulose yog suav tias tsim nyog thiab ua tiav los ntawm kev siv cov fibers uas tshwm sim los ntawm alkali fusion, grafting teb, ntxuav, ziab, sib tsoo thiab lwm yam txheej txheem. Yuav tsis ua mob rau tib neeg txoj kev noj qab haus huv.
Hydroxypropyl methyl cellulose, tseem hu ua hypromellose thiab cellulose hydroxypropyl methyl ether, yog tsim los ntawm kev siv cov paj rwb ntshiab heev cellulose ua raw khoom thiab undergoing tshwj xeeb etherification nyob rau hauv alkaline tej yam kev mob.
Lub synthesis ntawm hydroxypropyl methylcellulose: cov paj rwb refined cellulose yog kho nrog lye ntawm 35-40 ℃ rau ib nrab ib teev, squeezed, lub cellulose yog crushed, thiab cov laus yog nqa tawm ntawm 35 ℃ kom cov tau txais alkali fiber uniformly polymerized. Hauv qhov xav tau ntau yam. Muab cov alkali fiber ntau tso rau hauv etherification kettle, ntxiv propylene oxide thiab methyl chloride ua ntu zus, thiab etherify ntawm 50-80 ℃ rau 5h, thiab lub siab siab yog li 1.8MPa. Tom qab ntawd ntxiv qhov tsim nyog ntawm hydrochloric acid thiab oxalic acid los ntxuav cov ntaub ntawv hauv dej kub ntawm 90 ° C kom loj thiab ntim. Dehydrate los ntawm centrifugation. Swash rau nruab nrab. Thaum cov dej ntsiab lus hauv cov khoom tsawg dua 60%, ziab nws nrog cov cua kub ntawm 130 ° C mus rau cov ntsiab lus tsawg dua 5%.
HPMC tsim los ntawm cov txheej txheem hnyav siv toluene thiab isopropanol ua cov kuab tshuaj. Yog hais tias nws raug ntxuav heev, nws yuav muaj me ntsis tsw qab. Qhov no yog ib qho teeb meem ntawm cov txheej txheem ntxuav, uas tsis cuam tshuam rau kev siv lossis ib qho teeb meem.
Hypromellose yog paj rwb refined uas tsis tshua muaj impregnated nrog kua kom tau alkaline cellulose, thiab ces koom nyob rau hauv cov kuab tshuaj, etherification agents, toluene thiab isopropanol rau etherification cov tshuaj tiv thaiv, thiab yog neutralized, ntxuav, qhuav, thiab crushed kom tau cov khoom tiav. Qhov phem heev thiab tsis hnov tsw, yog li cov neeg siv tuaj yeem siv nws nyob rau hauv lub siab ruaj khov.
Hydroxypropyl methylcellulose yuav tsum tau them sai sai rau cov khoom hauv qab no hauv daim ntawv thov:
Nyob rau hauv cov nyhuv ntawm av nkos hmoov, hydroxypropyl methylcellulose tsuas plays ib tug txhawb nqa, thiab tsis koom nyob rau hauv tej tshuaj tiv thaiv. Cov av nkos hmoov ntxiv nrog dej thiab muab tso rau ntawm phab ntsa, uas yog cov tshuaj tiv thaiv. Vim yog kev tsim cov khoom tshiab, cov av nkos hmoov ntawm phab ntsa raug tshem tawm ntawm phab ntsa thiab hauv av ua hmoov los ua cov khoom tshiab. Hydroxypropyl methylcellulose tsuas khaws dej thiab pab grey calcium kom muaj cov lus teb zoo dua, tab sis nws tsis koom nrog cov lus teb.
Hydroxypropyl Methyl Cellulose HPMC tsis koom nrog cov tshuaj tiv thaiv tshuaj, tab sis tsuas yog pab. Ntxiv dej rau cov av nkos hmoov thiab muab tso rau ntawm phab ntsa, nws yog cov tshuaj tiv thaiv. Vim yog kev tsim cov khoom tshiab, cov av nkos hmoov ntawm phab ntsa raug tshem tawm ntawm phab ntsa thiab hauv av 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 grey calcium hmoov yog: Ca (OH) 2, sib tov ntawm CaO thiab ib qho me me ntawm CaCO3, CaO.
H2O = Ca (OH) 2-Ca (OH) 2 CO2 = CaCO3↓ H2O
Grey calcium ua lwm yam nyob rau hauv cov dej thiab CO2 nyob rau hauv cov huab cua, thaum HPMC tsuas khaws cov dej thiab pab grey calcium kom muaj cov lus teb zoo dua. Nws tsis koom nrog cov lus teb.
Hydroxypropyl methyl cellulose muaj ntau yam kev siv. Nyob rau hauv lub neej niaj hnub, ntau yam khoom yog inseparable los ntawm cov txheej txheem tsim. Tom qab ntawd, hauv kev lag luam sib txawv, cov txiaj ntsig ntawm hydroxypropyl methylcellulose yog dab tsi, kuv yuav piav qhia rau koj, kom koj tuaj yeem tiv thaiv kev siv tsis raug thaum tau txais kev paub.
Ua ntej tshaj plaws, nyob rau hauv kev tsim kho kev lag luam, nws tuaj yeem suav hais tias yog tus neeg saib xyuas kev ruaj ntseg thiab dej-retaining agent. Lub mortar mortar yog pumpable, yog li tag nrho cov mortar qhuav peb siv nws txoj kev koom tes. Tsis tas li ntawd, nyob rau hauv kev tsim cov ntaub ntawv xws li raw gypsum, plaster, thiab av nkos hmoov, nws yuav siv tau raws li ib tug binder, uas tsis tsuas yog ncua sij hawm rau lub lag luam, tab sis kuj ua rau cov xim ntau smearable. Nyob rau hauv marble, nplaum ceramic vuas, molecular compound yas decorations, nws yuav siv tau raws li ib tug adhesion enhancer, thiab lwm yam. Nws tuaj yeem hais tias hydroxypropyl methyl cellulose yog lub npe nrov tshaj plaws rau nws cov khoom siv hauv tsev.
Hauv lwm qhov kev lag luam, xws li porcelain thiab pottery manufacturing, nws tuaj yeem siv los ua cov nplaum rau kev tsim cov plooj (porcelain) thiab cov khoom siv tais diav; Nyob rau hauv kev lag luam lacquer thiab number case luam ntawv, nws tuaj yeem siv los ua cov hmoov xoob, thickener, stabilizer, thiab txawm tias nws tuaj yeem ua ke nrog cov organic solvent los yog dej sib xyaw zoo nkauj, thiab tuaj yeem siv los ua cov xim tshem tawm hauv kev tsim cov khoom siv molecular plastics. , nrog rau softeners, pwm tso tus neeg sawv cev, lubricants, thiab lwm yam.; nyob rau hauv kev tsim cov polyvinyl chloride, nws yog suav hais tias yog ib tug xoob hmoov.
Cov khoom ua los ntawm hydroxypropyl methylcellulose yog dav siv nyob rau hauv lub freshness ntawm txiv hmab txiv ntoo thiab zaub, tshuaj, tsiaj tawv nqaij thiab textile kev lag luam. Nws muaj kev nyab xeeb thiab tsis muaj tshuaj lom, tsis mob heev rau tib neeg lub cev mucous daim nyias nyias thiab tawv nqaij, thiab tuaj yeem siv los ua zaub mov ntxiv. Txawm li cas los xij, nyob rau hauv qhov xwm txheej tiag tiag, nws cov plua plav tuaj yeem ua rau huab cua tsis zoo, thiab nws tsis muaj txiaj ntsig zoo rau kev saib xyuas ntawm daim tawv nqaij kom cais tawm ntawm qhov hluav taws kub kom tsis txhob tawg.
tuav dej
Qhov tshwj xeeb hydroxypropyl methylcellulose rau kev tsim kho zam kev siv dej ntau dhau los ntawm cov substrate, thiab cov dej yuav tsum tau khaws cia rau hauv plaster ntau npaum li sai tau thaum lub sij hawm gypsum tag nrho. Cov cuab yeej tshwj xeeb no yog hu ua dej tuav thiab yog ncaj qha proportional rau viscosity ntawm hydroxypropyl methylcellulose tov siv rau kev tsim kho hauv plaster. Qhov siab dua qhov kev daws teeb meem viscosity, qhov siab dua cov dej tuav kev paub.
Anti-sagging
Lub mortar nrog cov khoom tshwj xeeb ntawm kev tiv thaiv sagging tuaj yeem siv nrog cov txheej tuab uas tsis muaj sagging, uas tseem txhais tau hais tias lub mortar nws tus kheej tsis hloov nws cov poj niam txiv neej, txwv tsis pub nws yuav swb thaum kev tsim kho pib.
Txo viscosity thiab pab kev tsim kho
Tom qab ntxiv ntau yam kev tsim kho tshwj xeeb hydroxypropyl methylcellulose cov khoom, ntsuab gypsum plaster nrog tus cwj pwm me me tuaj yeem tsim tau. Thaum nws pom tau tias tsim nyog thiab qis-viscosity qib ntawm kev tsim kho tshwj xeeb hydroxypropyl methylcellulose yog siv, qib ntawm viscosity kuj txo qis thiab kev tsim kho yooj yim dua. Txawm li cas los xij, cov dej khaws cia ntawm hydroxypropyl methylcellulose rau kev tsim kho uas tsis muaj viscosity yog qhov tsis muaj zog, thiab nws yog ib qho tsim nyog yuav tsum tau ntxiv cov nyiaj ntxiv.
Yas compatibilization tus nqi
Rau ib qho kev ruaj khov ntawm cov khib nyiab qhuav, nws yog qhov kev lag luam ntau dua los tsim cov mortar 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 lawm, lub zog tsis zoo.
Post lub sij hawm: Apr-26-2024