ib qho. Qhov txawv ntawm kev sib deevHydroxypropyl methylcellulose (HPMC)thiab ntshiab hydroxypropyl methylcellulose (HPMC)
1. Qhov tsos: Hydroxypropyl methylcellulose HPMC ntshiab zoo li fluffy thiab muaj qhov ceev tsawg, xws li 0.3-0.4g / ml; adulterated hydroxypropyl methylcellulose HPMC muaj cov kua dej zoo dua thiab xav tias hnyav dua, thiab muaj qhov sib txawv ntawm qhov tsos ntawm cov khoom tiag.
2. Xwm txheej: Hmoov hydroxypropyl methylcellulose HPMC ntshiab yog fibrous nyob rau hauv lub tshuab microscope lossis lub iav tsom iav; thaum adulterated hydroxypropyl methylcellulose HPMC tuaj yeem pom tau tias yog cov khoom khov lossis cov siv lead ua nyob rau hauv lub tshuab microscope lossis lub iav tsom iav.
3. Tsw: Hydroxypropyl methylcellulose HPMC ntshiab tsis tuaj yeem hnov tsw ntawm ammonia, hmoov txhuv nplej siab thiab cawv; adulterated hydroxypropyl methylcellulose HPMC tuaj yeem hnov txhua yam tsw, txawm tias nws tsis muaj saj, nws yuav hnov hnyav.
4. Cov kua dej: cov kua hydroxypropyl methylcellulose HPMC ntshiab, lub teeb ci ntsa iab, tus nqi khaws dej ≥ 97%; cov kua hydroxypropyl methylcellulose HPMC uas tau muab sib xyaw ua ke yog turbid, thiab tus nqi khaws dej nyuaj rau ncav cuag 80%.
Qhov thib ob, qhov kev khaws cia dej ntawm hydroxypropyl methylcellulose HPMC, qhov sib txawv ntawm qhov zoo thiab qhov tsis zoo:
Qhov kev khaws dej ntawm methyl cellulose ether nyob rau hauv qhov kub siab yog qhov qhia tseem ceeb los qhia qhov txawv ntawm qhov zoo ntawm methyl cellulose ether. Cov yam xws li qhov kub thiab txias ntawm huab cua, qhov kub thiab txias thiab qhov ceev ntawm cua yuav cuam tshuam rau qhov volatilization ntawm dej hauv cov cement mortar thiab cov khoom siv gypsum. Yog li ntawd, nyob rau hauv ntau lub caij sib txawv, muaj qee qhov sib txawv ntawm cov dej khaws cia ntawm cov khoom nrog tib qhov ntau ntawm HPMC ntxiv. Hauv kev tsim kho tshwj xeeb, cov dej khaws cia ntawm cov slurry tuaj yeem hloov kho los ntawm kev nce lossis txo qhov ntau ntawm HPMC ntxiv. Cov khoom zoo heev hydroxypropyl methylcellulose HPMC tuaj yeem daws qhov teeb meem ntawm kev khaws cia dej nyob rau hauv qhov kub siab.
Cov methylcellulose zoo tuaj yeem sib xyaw ua ke thiab zoo hauv cov cement mortar thiab gypsum-based cov khoom, thiab qhwv txhua yam khoom khov, thiab tsim cov zaj duab xis ntub dej, cov dej noo hauv lub hauv paus maj mam tso tawm ntev, thiab cov tshuaj inorganic Cov tshuaj tiv thaiv hydration ntawm cov khoom gelled ua kom lub zog sib txuas thiab lub zog compressive ntawm cov khoom. Cov hydroxypropyl methylcellulose HPMC zoo, nws qhov sib xws zoo heev, nws cov methoxy thiab hydroxypropoxy pawg tau faib sib npaug raws li cov saw hlau molecular cellulose, nws tuaj yeem ua rau cov pa oxygen ntawm cov hydroxyl thiab ether bonds Lub peev xwm ntawm cov atoms los koom nrog dej los tsim cov hydrogen bonds hloov cov dej dawb mus rau hauv dej khi, yog li tswj tau cov dej evaporation los ntawm huab cua kub thiab ua tiav cov dej khaws cia siab.
Yog li ntawd, nyob rau hauv kev tsim kho lub caij ntuj sov kub, txhawm rau kom ua tiav cov txiaj ntsig khaws cia dej, nws yog qhov tsim nyog los ntxiv cov khoom lag luam HPMC zoo hauv qhov ntau txaus raws li cov mis, txwv tsis pub, yuav muaj dej tsis txaus, txo lub zog, tawg, hollowing thiab shedding los ntawm kev qhuav ntau dhau. Cov teeb meem, tab sis kuj ua rau muaj teeb meem kev tsim kho ntawm cov neeg ua haujlwm. Thaum qhov kub poob qis, qhov ntau ntawm cov dej HPMC ntxiv tuaj yeem maj mam txo qis, thiab tib yam kev khaws cia dej tuaj yeem ua tiav.
3. Kev yaj ntawm hydroxypropyl methylcellulose HPMC
Hauv kev lag luam kev tsim kho, hydroxypropyl methylcellulose HPMC feem ntau muab tso rau hauv dej nruab nrab, thiab cov khoom HPMC raug yaj ib leeg los txiav txim qhov nrawm ntawm kev yaj. Tom qab muab tso rau hauv dej nruab nrab ib leeg, cov khoom uas sib sau ua ke sai sai yam tsis muaj kev kho saum npoo yog cov khoom tsis muaj kev kho saum npoo; tom qab muab tso rau hauv dej nruab nrab ib leeg, cov khoom uas tuaj yeem sib sau ua ke thiab tsis sib sau ua ke yog cov khoom uas muaj kev kho saum npoo. Thaum cov khoom tsis kho saum npoo hydroxypropyl methylcellulose HPMC yaj ib leeg, nws cov khoom me me yaj sai sai thiab tsim cov zaj duab xis sai sai, ua rau dej tsis nkag mus rau lwm cov khoom me me, ua rau muaj kev sib sau ua ke thiab sib sau ua ke, uas tam sim no hu ua kev yaj qeeb hauv kev lag luam khoom.
Cov khoom me me uas kho nrog hydroxypropyl methylcellulose HPMC, hauv dej nruab nrab, cov khoom me me tuaj yeem tawg tau yam tsis muaj kev sib sau ua ke, tab sis cov khoom viscosity yuav tsis tam sim ntawd. Tom qab ntub rau ib lub sijhawm, cov qauv tshuaj ntawm kev kho saum npoo raug rhuav tshem, thiab dej tuaj yeem yaj cov khoom me me HPMC. Lub sijhawm no, cov khoom me me tau tawg tag nrho thiab nqus dej txaus, yog li cov khoom yuav tsis sib sau ua ke lossis sib sau ua ke tom qab yaj. Qhov ceev ntawm kev tawg thiab qhov ceev ntawm kev yaj nyob ntawm qib ntawm kev kho saum npoo. Yog tias kev kho saum npoo me me, qhov ceev ntawm kev tawg qeeb qeeb thiab qhov ceev ntawm kev lo yog ceev; thaum cov khoom nrog kev kho saum npoo tob muaj qhov ceev ntawm kev tawg sai thiab qhov ceev ntawm kev lo qeeb. Yog tias koj xav ua kom cov khoom no yaj 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 tam sim ntawd. Cov yam ntxwv ntawm cov khoom kho saum npoo HPMC yog: hauv cov kua dej, cov khoom me me tuaj yeem tawg ua ke, tuaj yeem yaj sai hauv lub xeev alkaline, thiab yaj qeeb hauv lub xeev nruab nrab thiab acidic.
Cov yam ntxwv ntawm cov hydroxypropyl methylcellulose HPMC uas tsis tau kho yog: ib qho khoom me me yaj sai heev hauv cov kua qaub, alkaline, thiab cov xeev tsis muaj zog, tab sis tsis tuaj yeem tawg ntawm cov khoom me me hauv cov kua, ua rau muaj kev sib sau ua ke thiab sib sau ua ke. Hauv kev ua haujlwm tiag tiag, tom qab kev sib cais ntawm cov khoom no thiab cov khoom khov xws li hmoov roj hmab, cement, xuab zeb, thiab lwm yam, qhov nrawm ntawm kev yaj yog ceev heev, thiab tsis muaj kev sib sau ua ke lossis kev sib sau ua ke. Thaum nws tsim nyog los yaj cov khoom HPMC sib cais, cov khoom no yuav tsum tau siv nrog kev ceev faj, vim nws yuav sib sau ua ke thiab tuav ua ke. Yog tias nws tsim nyog los yaj cov khoom hydroxypropyl methylcellulose HPMC uas tsis tau kho sib cais, nws yuav tsum tau sib cais nrog 95 ° C dej kub, thiab tom qab ntawd txias kom yaj.
Hauv kev ua haujlwm ntau lawm tiag tiag, cov khoom no feem ntau yaj tom qab raug yaj nrog lwm cov khoom khov kho hauv qab cov xwm txheej alkaline, thiab nws qhov kev yaj tsis txawv ntawm cov khoom tsis kho. Nws kuj tseem siv tau rau hauv cov khoom uas yaj ib leeg, tsis muaj caking lossis lumps. Tus qauv tshwj xeeb ntawm cov khoom tuaj yeem xaiv raws li qhov kev yaj uas xav tau los ntawm kev tsim kho.
Thaum lub sijhawm tsim kho, txawm tias nws yog cov cement mortar lossis gypsum-based slurry, feem ntau ntawm lawv yog cov kab ke alkaline, thiab qhov ntau ntawm HPMC ntxiv yog me me heev, uas tuaj yeem sib npaug ntawm cov khoom no. Thaum ntxiv dej,HPMCyuav yaj sai sai.
Lub sijhawm tshaj tawm: Plaub Hlis-26-2024