Hauv kev tsim kho kev lag luam, HPMC feem ntau muab tso rau hauv cov dej nruab nrab, thiab cov khoom HPMC yog 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 cov khoom tsis kho HPMC yog yaj ib leeg, nws cov khoom ib leeg yaj sai sai thiab tsim cov yeeb yaj kiab sai, uas ua rau nws tsis yooj yim rau cov dej nkag mus rau lwm cov khoom, ua rau agglomeration thiab agglomeration. Nws yog hu ua instant khoom nyob rau hauv lub lag luam tam sim no. Cov yam ntxwv ntawm HPMC tsis kho yog: ib tus neeg cov khoom tawg sai heev nyob rau hauv nruab nrab, alkaline, thiab acidic xeev, tab sis tsis tuaj yeem tawg ntawm cov khoom hauv cov kua, ua rau agglomeration thiab clustering. 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 tias nws yuav agglomerate thiab tsim pob. Yog tias nws yog qhov tsim nyog los yaj cov khoom tsis kho HPMC cais, nws yuav tsum tau muab faib ua 95 ° C dej kub, thiab tom qab ntawd txias kom yaj.
HPMC cov khoom uas tau kho saum npoo av, hauv cov dej nruab nrab, ib tus neeg cov khoom tuaj yeem tawg tau yam tsis muaj agglomeration, tab sis yuav tsis tsim viscosity 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 dispersion ceev kuj qeeb thiab qhov nrawm nrawm; thaum cov khoom nrog kev sib sib zog nqus nto kho tau 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 qeeb. 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.
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, HPMC yuav yaj sai sai. Tsuas yog hydroxypropyl methylcellulose tiag tiag tuaj yeem tiv taus qhov kev sim ntawm plaub lub caij: cov txheej txheem tshuaj tiv thaiv tau raug tswj hwm los tsim HPMC, thiab nws qhov kev hloov pauv tau ua tiav thiab qhov sib xws zoo heev. Nws cov tshuaj aqueous yog ntshiab thiab pob tshab, nrog ob peb fibers dawb. Kev sib raug zoo nrog cov hmoov roj hmab, cement, txiv qaub thiab lwm yam ntaub ntawv tseem ceeb yog qhov tshwj xeeb, uas tuaj yeem ua rau cov ntaub ntawv tseem ceeb ua tau zoo tshaj plaws. Txawm li cas los xij, HPMC nrog cov tshuaj tiv thaiv tsis zoo muaj ntau cov fibers dawb, tsis sib xws ntawm cov khoom siv hloov pauv, cov dej tsis zoo thiab lwm yam khoom, ua rau muaj dej ntau hauv huab cua kub. Txawm li cas los xij, lub npe hu ua HPMC nrog ntau cov tshuaj ntxiv yog qhov nyuaj rau kev sib koom ua ke, yog li kev ua haujlwm ntawm cov dej tuav tau ntau dua. Thaum siv HPMC tsis zoo, cov teeb meem xws li lub zog slurry tsawg, lub sij hawm qhib luv luv, hmoov av, tawg, hollowing thiab shedding yuav tshwm sim, uas yuav ua rau kom qhov nyuaj ntawm kev tsim kho thiab txo qhov zoo ntawm lub tsev. Tib yam yog cellulose ether, tuaj yeem muaj qhov sib txawv kiag li.
Post lub sij hawm: Mar-29-2023