Hauv cov capulose qhuav, cellulose ether yog ib qho tseem ceeb ntxiv uas tuaj yeem txhim kho cov tshuaj khib nyiab qhuav thiab cuam tshuam kev ua tshuaj cug. Methyl cellulose ua lub luag haujlwm ntawm dej khaws cia, thickening, thiab kev txhim kho ntawm kev tsim kho kev ua haujlwm. Cov dej zoo khaws cia ua tau zoo tias lub tshuaj khib yuav tsis ua rau sanding, hmoov thiab muaj zog daws teeb meem thiab tsis ua tiav kev ua tsis tiav; Thickening nyhuv lub zog ntawm lub zog ntub dej ntawm cov tshuaj khib nyiab ntub dej, thiab muaj cov tshuaj tua ntub dej, li txhim kho cov tshuaj khib nyiab ntub dej ntawm phab ntsa thiab txo cov khib nyiab; Ib qho ntxiv, txawv lub luag haujlwm ntawm cellulose hauv cov khoom kuj tseem txawv, piv txwv li: cellulose hauv cov nplais nplaum tuaj yeem kho lub sijhawm thiab kho lub sijhawm; cellulose nyob rau hauv cov tshuab txau kab tsuag yuav hloov kho cov txheej txheem hluav taws xob ntawm cov tshuaj khib nyiab ntub; Hauv kev coj tus kheej, cellulose ua lub luag haujlwm ntawm kev tiv thaiv kev sib hais haum, cais thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification thiab stratification.
Kev tsim cov cellulose ether yog feem ntau yog ua los ntawm ntuj fibers los ntawm alkali dissolution, kev sib tsoo), ntxuav) thiab lwm yam kev ua tiav. Cov ntaub ntawv nyoos raw ntawm ntuj fibers tuaj yeem faib ua: rwbe fiber, cedar fiber ntau, tshuaj ntsuab ntawm polymerization sib txawv, uas yuav cuam tshuam rau qhov kawg viscosity ntawm lawv cov khoom. Ntawm tam sim no, cov cellulose cellulose tsim siv cov paj rwb fiber ntau (cov khoom lag luam ntawm nitrocellulose) raws li cov khoom siv tseem ceeb. Cov cellulose muaj neeg muaj peev xwm faib ua ionic thiab tsis yog ionic. Lub ionic hom tsuas yog suav nrog carboxymethyl cellulose cellulose cell, thiab hom tsis yog xam phaj methylfose, tshuaj ntsuab) cellulose, thiab hydroxyethyl cellulose. Su thiab lwm yam. Hauv cov hmoov huv, vim ionic cellulose (carboxymethyl cellulose cellulose cell) yog tsis ruaj khov ntawm cov khoom noj txiv qaub xws li MAAs slaked lime raws li cov khoom noj.
Cov dej ua kom rov tuav ntawm cellulose kuj muaj feem xyuam rau qhov kub siv. Cov dej tuav tseg ntawm methyl cellulose ether tsawg dua nrog qhov nce ntawm kub. Piv txwv li, thaum lub caij ntuj sov, thaum muaj hnub ci, sab nraud phab ntsa weety plasters, uas feem ntau ua kom nrawm dua ntawm txoj siav thiab tshuaj khib. Lub hardening thiab txo qis ntawm cov dej khaws cia rau qhov pom tseeb tias ob qho kev tsim kho kev ua tau zoo thiab kev tawm tsam kev ua haujlwm tau cuam tshuam. Hauv qhov no, nws yog qhov tshwj xeeb tshaj yog txo tus cawv ntawm qhov kub. Qee lub sij hawm nws tsis tuaj yeem ua tau raws li qhov xav tau ntawm kev siv. Qee cov kev kho yog ua tiav ntawm lub cellulose, xws li nce qib etherification, thiab kom cov nyhuv retuab ntaub tseem tuaj yeem tswj cov nyhuv zoo dua ntawm qhov kub siab dua.
Dej tuav tseg ntawm cellulose cuam tshuam rau cov dej ceev ntawm cellulose ntxiv, lub painen ntawm cellulose, thiab ntsuas kub ntawm kev ua haujlwm.
Viscosity ntawm cellulose: feem ntau hais lus, qhov siab dua cov dej khov kho, thiab ntau dua cov kev ua kom tsawg ntawm cov solubility, uas muaj qhov tsis zoo rau kev ua haujlwm thiab lub zog ntawm cug. Qhov siab tshaj lub viscosity, qhov pom ntau ntxiv rau cov nyhuv tuab rau ntawm lub tshuaj khib, tab sis nws tsis ncaj ncaj ncaj. Qhov siab tshaj lub viscosity, ntau ntau ntau lub volt ntub lub cug yuav. Thaum lub sijhawm kev tsim kho, nws yuav lo rau cov scraper thiab muaj cov khoom zoo rau cov txheej txheem huab ua ke ntawm lub zog ntub nws tus kheej, thiab kev tiv thaiv kev ua kom pom tseeb thaum lub sijhawm kev tsim kho.
Lub fineness ntawm cellulose: qhov zoo tshaj plaws cuam tshuam rau solubility ntawm cellulose ether. Cov coarse cellulose feem ntau yog granular thiab yooj yim dispersed nyob rau hauv dej yam tsis muaj agglomeration, tab sis kev sib cais yog qeeb heev. Nws tsis haum rau siv rau hauv cov hmoov av qhuav. Domestically tsim qee cov cellulose yog flocculent, nws tsis yooj yim rau disperse thiab yaj tau dej, thiab nws yooj yim rau agglomerate. Tsuas yog cov hmoov zoo txaus xwb tuaj yeem zam methyl cellulose aith aggomation thaum ntxiv dej thiab nplawm. Tab sis cov cellulose thicker ether tsis yog pov tseg xwb tab sis kuj yuav txo lub zog ntawm lub tshuaj khib. Thaum xws li lub cev qhuav hmoov ua tsim nyob rau hauv thaj chaw loj, qhov kev kho kom zoo ntawm lub zog cort yog txo, thiab cov kab nrib pleb vim muaj lub sijhawm kho sib txawv tshwm sim. Vim yog lub sijhawm sib xyaw luv luv, cov tshuaj khib nrog cov kev kho tshuab tshuab yuav tsum muaj txiaj ntsig siab dua.
Lub sijhawm Post: Feb-13-2023