ib. Qhov txawv ntawm kev deev luag poj luag txivHydroxypropyl methylcellulose (HPMC)thiab ntshiab hydroxypropyl methylcellulose (HPMC)
1. Pom zoo: HydroxyPropylropy Holmc zoo nkaus li fluffy thiab muaj qhov tsawg bultity, xws li 0.3-0.4g / ml; HPMC propylated hydroxypropyl methylcellulose muaj fluidity zoo dua thiab xav tias hnyav dua, thiab muaj qhov sib txawv tseem ceeb hauv cov tsos ntawm cov khoom tiag.
2. Raws li txoj cai: Ntshiab hydroxypropyl methylcellulose HPMC hmoov yog fibrous nyob rau hauv ib lub tshuab raj los yog magnifying iav; thaum deev luag poj luag txiv hydroxypropyl methylcellulose HPMC tuaj yeem pom raws li cov khoom siv granular lossis crystals nyob rau hauv lub tshuab tsom lossis lub iav loj.
3. Cov ntxhiab tsw: ntshiab hydroxypropyl methylcellulose HPMC tsis tuaj yeem hnov tsw tsw ntawm ammonia, hmoov txhuv nplej siab thiab cawv; HPMC tus ntxhiab tsw ntxhiab ntawm hydroxypropyl methylcellulose tuaj yeem hnov txhua yam tsw, txawm tias nws tsis qab los, nws yuav hnov qhov hnyav.
4. Aqueous tov: ntshiab hydroxypropyl methylcellulose HPMC aqueous tov yog ntshiab, siab transmittance, dej tuav tus nqi ≥ 97%; HPMC aqueous tov yog turbid, thiab cov dej tuav tus nqi yog qhov nyuaj mus txog 80%.
Thib ob, cov dej tuav ntawm hydroxypropyl methylcellulose HPMC, paub qhov zoo thiab qhov tsis zoo:
Kev tuav dej ntawm methyl cellulose ether nyob rau hauv qhov kub thiab txias yog ib qho tseem ceeb qhia kom paub qhov zoo ntawm methyl cellulose ether. Cov yam ntxwv xws li huab cua kub, kub thiab cua siab ceev yuav cuam tshuam rau cov volatilization tus nqi ntawm cov dej hauv cement mortar thiab gypsum-based khoom. Yog li ntawd, nyob rau lub caij sib txawv, muaj qee qhov sib txawv ntawm cov dej tuav cov khoom ntawm cov khoom nrog tib tus nqi ntawm HPMC ntxiv. Hauv kev tsim kho tshwj xeeb, cov dej tuav cov nyhuv ntawm cov slurry tuaj yeem hloov kho los ntawm kev nce lossis txo tus nqi ntawm HPMC ntxiv. Cov khoom zoo heev hydroxypropyl methylcellulose HPMC tuaj yeem daws qhov teeb meem ntawm dej tuav hauv qhov kub thiab txias.
Cov khoom zoo methylcellulose tuaj yeem sib txawv thiab ua haujlwm zoo hauv cov cement mortar thiab gypsum-raws li cov khoom, thiab qhwv tag nrho cov khoom siv, thiab tsim cov yeeb yaj kiab ntub dej, cov dej noo nyob rau hauv lub hauv paus yog maj mam tso tawm rau lub sijhawm ntev, thiab cov inorganic hydration cov tshuaj tiv thaiv ntawm cov khoom gelled kom lub zog thiab compressive zog ntawm cov khoom. High-zoo hydroxypropyl methylcellulose HPMC, nws cov uniformity yog zoo heev, nws methoxy thiab hydroxypropoxy pawg yog tusyees faib nyob rau hauv lub cellulose molecular saw, nws muaj peev xwm ua kom cov pa ntawm hydroxyl thiab ether bonds Lub peev xwm ntawm atoms koom nrog dej los tsim hydrogen bonds hloov dej dawb rau hauv cov dej khi, yog li kev tswj cov dej kub thiab dej siab.
Yog li ntawd, nyob rau hauv high-temperature lub caij ntuj sov kev tsim kho, thiaj li yuav ua kom tiav cov dej tuav nyhuv, nws yog tsim nyog los ntxiv high-zoo HPMC cov khoom nyob rau hauv kom muaj nuj nqis raws li cov mis, txwv tsis pub, yuav muaj tsis txaus hydration, txo lub zog, tawg, hollowing thiab shedding tshwm sim los ntawm ntau dhau ziab. teeb meem, tab sis kuj nce kev tsim kho nyuaj ntawm cov neeg ua haujlwm. Raws li qhov kub thiab txias, cov dej HPMC ntxiv tuaj yeem txo qis, thiab tib cov dej tuav tau tuaj yeem ua tiav.
3. Dissolution ntawm hydroxypropyl methylcellulose HPMC
Hauv kev tsim kho kev lag luam, hydroxypropyl methylcellulose HPMC feem ntau muab tso rau hauv cov dej nruab nrab, thiab cov khoom HPMC yaj ib leeg los txiav txim qhov kev sib cais. Tom qab muab tso rau hauv dej nruab nrab ib leeg, cov khoom lag luam uas sai sai clumps tsis dispersing yog ib yam khoom uas tsis muaj kev kho deg; tom qab muab tso rau hauv cov dej nruab nrab ib leeg, cov khoom uas tuaj yeem tawg thiab tsis clump ua ke yog cov khoom siv nrog kev kho saum npoo. Thaum lub nto tsis kho hydroxypropyl methylcellulose HPMC yog yaj ib leeg, nws cov ib qho me me yaj sai sai thiab tsim ib zaj duab xis sai, ua rau dej tsis nkag mus rau lwm yam khoom, ua rau agglomeration thiab agglomeration, uas tam sim no hu ua qeeb dissolution nyob rau hauv cov khoom lag luam.
Hniav-kho hydroxypropyl methylcellulose HPMC cov khoom hais, nyob rau hauv nruab nrab dej, ib tug neeg hais yuav dispersed yam tsis muaj agglomeration, tab sis cov khoom viscosity yuav tsis tam sim ntawd. Tom qab soaking rau ib lub sij hawm ntawm lub sij hawm, cov txheej txheem tshuaj ntawm kev kho deg raug puas tsuaj, thiab cov dej yuav yaj cov HPMC hais. Lub sij hawm no, cov khoom hais tau tag nrho dispersed thiab absorbed txaus dej, yog li cov khoom yuav tsis agglomerate los yog agglomerate tom qab dissolution. Dispersion ceev thiab dissolution ceev nyob ntawm seb qhov degree ntawm kev kho deg. Yog tias qhov kev kho saum npoo yog me ntsis, qhov kev sib kis ceev yog qhov qeeb thiab qhov nrawm nrawm; thaum cov khoom nrog sib sib zog nqus nto kho mob muaj ceev dispersion ceev thiab qeeb sticking ceev. Yog tias koj xav ua kom cov khoom lag luam no yaj sai sai hauv lub xeev no, koj tuaj yeem tso me me ntawm cov tshuaj alkaline thaum lawv yaj ib leeg. Kev ua lag luam tam sim no feem ntau hu ua cov khoom lag luam tam sim. Cov yam ntxwv ntawm cov khoom HPMC kho saum npoo yog: hauv cov kua dej, cov khoom tuaj yeem sib cais, tuaj yeem yaj sai sai hauv lub xeev alkaline, thiab maj mam yaj hauv nruab nrab thiab acidic xeev.
Cov yam ntxwv ntawm tsis kho hydroxypropyl methylcellulose HPMC yog: ib qho me me yaj sai heev hauv acidic, alkaline, thiab nruab nrab, tab sis tsis tuaj yeem tawg ntawm cov khoom hauv cov kua, uas ua rau muaj kev sib koom ua ke thiab agglomeration. Hauv kev ua haujlwm tiag tiag, tom qab lub cev dispersion ntawm cov khoom lag luam thiab cov khoom siv xws li roj hmab hmoov, cement, xuab zeb, thiab lwm yam, tus nqi tawg yog ceev heev, thiab tsis muaj agglomeration lossis agglomeration. Thaum nws yog ib qho tsim nyog los yaj HPMC cov khoom sib cais, cov khoom siv no yuav tsum tau siv nrog ceev faj, vim nws yuav sib sau ua ke thiab tuav ua ke. Yog tias nws yog qhov tsim nyog los yaj cov khoom tsis-nto-kho hydroxypropyl methylcellulose HPMC cov khoom sib cais, nws yuav tsum tau muab faib ua 95 ° C dej kub, thiab tom qab ntawd txias kom yaj.
Hauv kev ua haujlwm tiag tiag, cov khoom lag luam no feem ntau yaj tom qab dispersed nrog lwm cov khoom particle khoom nyob rau hauv alkaline tej yam kev mob, thiab nws dissolution tus nqi tsis txawv ntawm cov khoom uas tsis kho. Nws kuj yog tsim rau siv nyob rau hauv cov khoom uas yaj ib leeg, tsis muaj caking los yog lumps. Cov qauv tshwj xeeb ntawm cov khoom tuaj yeem xaiv tau raws li qhov kev sib cais uas yuav tsum tau ua los ntawm kev tsim kho.
Thaum lub sij hawm tsim kho, txawm tias nws yog cement mortar los yog gypsum-based slurry, feem ntau ntawm lawv yog alkaline systems, thiab tus nqi ntawm HPMC ntxiv yog me me, uas tuaj yeem sib npaug ntawm cov khoom no. Thaum dej ntxiv,HPMCyuav yaj sai sai.
Post lub sij hawm: Apr-26-2024