Dab tsi yog qhov txawv ntawm kev ua haujlwm ntawm methyl cellulose ether thiab lignin fiber

Dab tsi yog qhov txawv ntawm kev ua haujlwm ntawm methyl cellulose ether thiab lignin fiber

Teb: Qhov kev sib piv ntawm methyl cellulose ether thiab lignin fiber yog qhia nyob rau hauv lub rooj

 Kev sib piv ntawm methyl cellulose ether thiab lignin fiber

Dab tsi yuav tsum tau them sai sai rau thaum siv methyl cellulose thiab carboxymethyl cellulose?

Teb: (1) Thaum siv cov dej kub kom yaj cov cellulose, nws yuav tsum tau txias kom tag ua ntej siv. Qhov ntsuas kub yuav tsum tau ua kom tiav kev sib cais thiab qhov zoo tshaj plaws pob tshab nyob ntawm seb hom cellulose.

(2) Kub xav tau kom tau txais viscosity txaus

Carboxymethylcellulose ≤ 25 ℃, methylcellulose ≤ 20 ℃

(3) Maj mam thiab sib npaug sieve cov cellulose rau hauv dej, thiab do kom txog thaum tag nrho cov khoom yog soaked, thiab ces do kom txog thaum tag nrho cov cellulose tov yog pob tshab thiab meej. Tsis txhob nchuav dej ncaj qha rau hauv cellulose, thiab tsis txhob ncaj qha ntxiv ntau ntawm cellulose uas tau dampened thiab tsim rau hauv pob lossis pob rau hauv lub thawv.

(4) Ua ntej cov hmoov cellulose wetted nrog dej, tsis txhob ntxiv alkaline tshuaj mus rau qhov sib tov, tab sis tom qab dispersion thiab soaking, ib tug me me ntawm alkaline aqueous tov (pH8 ~ 10) yuav muab ntxiv kom ceev lub dissolution. Cov uas tuaj yeem siv tau yog: sodium hydroxide aqueous tov, sodium carbonate aqueous tov, sodium bicarbonate aqueous tov, txiv qaub dej, ammonia dej thiab organic ammonia, thiab lwm yam.

(5) Qhov chaw kho cellulose ether tau zoo dua dispersibility hauv dej txias. Yog hais tias nws tau ncaj qha ntxiv rau cov tshuaj alkaline, kev kho saum npoo yuav ua tsis tiav thiab ua rau muaj kuab paug, yog li yuav tsum tau saib xyuas ntau dua.

Dab tsi yog cov khoom ntawm methylcellulose?

Teb: (1) Thaum rhuab saum 200 ° C, nws melts thiab decomposes. Cov ntsiab lus tshauv yog kwv yees li 0.5% thaum hlawv, thiab nws yog nruab nrab thaum nws ua rau slurry nrog dej. Raws li rau nws cov viscosity, nws nyob ntawm qhov degree ntawm polymerization.

(2) Solubility nyob rau hauv dej yog inversely proportional rau kub, siab kub muaj tsawg solubility, tsis tshua muaj kub muaj siab solubility.

(3) Nws tuaj yeem yaj hauv qhov sib xyaw ntawm cov dej thiab cov kuab tshuaj organic, xws li methanol, ethanol, ethylene glycol, glycerin thiab acetone.

(4) Thaum muaj cov ntsev ntsev los yog cov organic electrolytes hauv nws cov kua aqueous, cov tshuaj tseem tuaj yeem nyob ruaj khov. Thaum cov electrolyte ntxiv rau hauv ib qho loj, gel lossis nag lossis daus yuav tshwm sim.

(5) Muaj kev ua haujlwm saum npoo. Vim muaj cov hydrophilic thiab hydrophobic pawg nyob rau hauv nws cov molecules, nws muaj lub zog ntawm emulsification, tiv thaiv colloid thiab theem stability.

(6) Kub gelling. Thaum cov tshuaj aqueous nce mus rau qhov kub thiab txias (tshaj qhov kub ntawm gel), nws yuav turbid kom txog thaum nws gels los yog precipitates, ua rau cov tshuaj poob nws viscosity, tab sis nws tuaj yeem rov qab mus rau qhov qub qub tom qab txias. Qhov kub ntawm qhov gelation thiab nag lossis daus tshwm sim nyob ntawm hom khoom, qhov concentration ntawm cov tshuaj, thiab tus nqi cua sov.

(7) Cov pH ruaj khov. Lub viscosity ntawm aqueous tov tsis yooj yim cuam tshuam los ntawm acid thiab alkali. Tom qab ntxiv cov alkali ntau ntau, tsis hais txog qhov kub thiab txias, nws yuav tsis ua rau decomposition lossis saw splitting.

(8) Tom qab cov tshuaj dries rau saum npoo, nws tuaj yeem tsim cov pob tshab, tawv thiab elastic, uas tiv taus cov kuab tshuaj organic, rog thiab ntau yam roj. Nws tsis tig daj lossis fluffy thaum raug lub teeb, thiab tuaj yeem rov ua dua hauv dej. Yog tias formaldehyde ntxiv rau cov tshuaj lossis tom qab kho nrog formaldehyde, zaj duab xis yog insoluble hauv dej, tab sis tseem tuaj yeem nthuav tawm ib nrab.

(9) Thickening. Nws tuaj yeem ua kom dej thiab cov tshuab tsis muaj dej, thiab muaj kev ua haujlwm zoo los tiv thaiv sag.

(10) Viscosity. Nws cov tshuaj aqueous muaj zog cohesiveness, uas tuaj yeem txhim kho cov cohesiveness ntawm cement, gypsum, xim, pigment, wallpaper, thiab lwm yam.

(11) Kev ncua. Nws tuaj yeem siv los tswj cov coagulation thiab nag lossis daus ntawm cov khoom siv.

(12) Tiv thaiv cov colloid thiab txhim kho kev ruaj ntseg ntawm cov colloid. Nws tuaj yeem tiv thaiv qhov sib txuam thiab coagulation ntawm cov tee dej thiab cov pigments, thiab tiv thaiv tau los nag.

(13) Kev ruaj ntseg dej. Cov tshuaj aqueous muaj viscosity siab. Thaum ntxiv rau hauv mortar, nws muaj peev xwm tuav tau cov ntsiab lus dej siab, uas zoo tiv thaiv kev nqus dej ntau dhau los ntawm cov substrate (xws li cib, pob zeb, thiab lwm yam) thiab txo cov evaporation ntawm cov dej.

(14) Zoo li lwm yam kev daws teeb meem colloidal, nws yog solidified los ntawm tannins, protein precipitants, silicates, carbonates, thiab lwm yam.

(15) Nws tuaj yeem tov nrog carboxymethyl cellulose hauv txhua qhov kev faib ua feem kom tau txais cov teebmeem tshwj xeeb.

(16) Kev khaws cia ntawm kev daws teeb meem yog qhov zoo. Yog tias nws tuaj yeem khaws cia kom huv si thaum npaj thiab khaws cia, nws tuaj yeem khaws cia rau ob peb lub lis piam yam tsis muaj decomposition.

CEEB TOOM: Methylcellulose tsis yog qhov nruab nrab loj hlob rau cov kab mob, tab sis yog tias nws dhau los ua cov kab mob sib kis, nws yuav tsis tiv thaiv lawv los ntawm kev sib npaug.Yog tias cov tshuaj tau rhuab ntev dhau, tshwj xeeb tshaj yog nyob rau hauv cov kua qaub, cov saw molecules kuj tseem sib cais, thiab lub viscosity yuav txo qis rau lub sijhawm no. Nws kuj tseem tuaj yeem ua rau tawg hauv oxidizing cov neeg ua haujlwm, tshwj xeeb tshaj yog nyob rau hauv cov tshuaj alkaline.

Dab tsi yog qhov tseem ceeb ntawm carboxymethyl cellulose (CMC) ntawm gypsum?

Teb: Carboxymethyl cellulose (CMC) feem ntau plays lub luag hauj lwm ntawm thickening thiab nplaum, thiab dej tuav nyhuv tsis pom tseeb. Yog hais tias nws yog siv nyob rau hauv ua ke nrog nrog dej tuav tus neeg saib xyuas, nws yuav thicken thiab thicken lub gypsum slurry thiab txhim kho kev tsim kho, tab sis carboxymethyl cellulose Lub hauv paus cellulose yuav retard qhov chaw ntawm gypsum, los yog txawm tsis solidify, thiab lub zog yuav poob ho. , yog li tus nqi siv yuav tsum tau tswj nruj me ntsis.