Lub thickener rau looj xim yuav tsum muaj qhov sib xyaw zoo nrog cov duab dhos ua kom zoo, thiab yuav txo cov yeeb yaj kiab me me, thiab yuav txo cov viscgosity, uas yuav txo cov viscosity thiab coarsen lub particle loj. Cov tuab yuav hloov pauv cov nqi ntawm emulsion. Piv txwv li, lub cationic thickener yuav muaj cov nyhuv tsis txaus ntseeg ntawm anionic emulsifier los tsoo lub emulsion. Cov tuab zoo tshaj rau cov xim looj cov xim yas yuav tsum muaj cov peev txheej hauv qab no:
1. Qaub ntau thiab zoo viscosity
2. Cov khoom lag luam kom ruaj khov, tsis muaj viscosity txo vim kev txiav txim ntawm cov enzymes, thiab tsis muaj viscosity txo vim muaj kev hloov pauv ntawm qhov kub thiab txias thiab pH nqi
3, cov dej zoo khaws cia, tsis muaj qhov pom tseeb npuas qhov tshwm sim
4. Tsis muaj kev phiv rau cov yeeb yaj kiab xws li cov txhuam tsis kam, ci, zais lub hwj chim thiab dej tsis kam
5. Tsis muaj cov xim flocculation
Qhov tuab tuab ntawm cov xim yas yog qhov tseem ceeb los txhim kho cov kua txiv hmab txiv ntoo zoo thiab txo tus nqi. Hydroxyethyl cellulose yog cov tuab zoo tshaj plaws, uas muaj ntau yam kev cuam tshuam ntau ntawm cov thickening, kev hloov kho ntawm cov xim huv.
Hauv cov txheej txheem ntau lawm ntawm cov xim qhuav, hydroxyethyl cellulose (HEC) yog siv los ua cov yeeb yaj kiab uas tsis sib xws, ua kom cov xim pleev xim du thiab du, thiab tseem ua rau cov xim zoo nkauj dua. Zoo rheology, tuaj yeem tiv taus siab zog siab, thiab tuaj yeem muab kev ua kom zoo, kos tsis kam thiab xim sib dhos. Nyob rau tib lub sijhawm, HEC muaj cov xim xim zoo heev, thiab cov kua txiv hmab txiv ntoo zoo heev nrog kev txhuam hniav, yog li cov kev tsim kho, tsis yooj yim ntxuav thiab sag, thiab tsawg dua los txaws. HEC muaj kev txhim kho xim zoo heev. Nws muaj qhov zoo tshaj plaws ua tau zoo nrog cov xim feem ntau thiab cov xim, ua kom nws tsim cov xim loojx xim zoo nkauj nrog cov xim zoo sib xws thiab ruaj khov. Cov khoom siv tau thov rau hauv kev tsim qauv, nws yog ib qho tsis-ionic ether. Yog li ntawd, nws tuaj yeem siv rau hauv cov nplooj ntau (2 ~ 12), thiab tuaj yeem sib xyaw nrog cov khoom siv looj ntawm cov xim zoo li cov xim sib ntxiv lossis cov ntsev sib ntxiv lossis cov ntsev sib ntxiv lossis cov ntsev ua ntxiv lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble ntsev lossis soluble salts lossis elecolytes.
Tsis muaj qhov cuam tshuam tsis zoo ntawm cov txheej duab zaj duab xis. Vim tias cov tshuaj aqueque muaj cov khoom siv nro, nws tsis yooj yim rau ua npuas ncauj thaum muaj kev tsim khoom thiab kev tsim kho, thiab qhov nyiam ntawm roob hluav taws xob thiab pinnes tsawg dua.
Kev khaws cia zoo. Nyob rau hauv lub sijhawm khaws cia ntev, qhov dispersibility thiab ncua ntawm cov xim tuaj yeem tswj, thiab tsis muaj teeb meem ntawm cov xim ntab thiab tawg paj. Thaum muaj cov txheej dej me me ntawm cov xim saum npoo av thiab qhov cia kom sov hloov zoo heev. Nws cov viscosity tseem muaj nyob ruaj khov.
HEC tuaj yeem nce tus nqi PVC tus nqi (cov xim xim ntim cov kev xav tau) cov khoom sib xyaw ua ke txog li 50-60%. Tsis tas li ntawd, lub Topcoat thickener ntawm cov xim xim dej kuj tseem siv tau HEC.
Tam sim no, cov tuab siv hauv cov xim tsev high-qib yog impored HEC thiab copopolymer emulsion ntawm acrylic acid thiab methalicic acid) thickeners.
Hydroxyethyl cellulose tuaj yeem siv rau
1. Raws li cov kua nplaum lossis cov kua nplaum tiv thaiv
Feem ntau, hac nrog viscosity ntawm 10 txog 30 mpas yog siv. Tus HEC nce mus txog 300MpaMpaN tuaj yeem siv ua ke nrog anionic lossis cationic surfactants, thiab kev dispersion zoo dua. Tus nqi siv hluav taws xob feem ntau 0.05% ntawm qhov loj ntawm Monomer.
2, raws li tuab tuab
Siv 15000Mpa. Cov ntaub ntawv tshuaj ntawm cov siab-viscosity hac saum toj s yog 0.5 mus rau 1% ntawm tag nrho cov huab hwm coj, thiab tus PVC tus nqi tuaj yeem ncav cuag li 60%. Nyob rau hauv lub latex xim, lub HEC ntawm txog 20pa, S yog siv, thiab ntau yam khoom ntawm cov xim looj yas yog qhov zoo tshaj plaws. Tus nqi tsuas yog siv HEC saud 30o00pa.s yog qis dua. Txawm li cas los xij, qib theem thiab lwm yam ntawm cov xim looj kua ntawm cov xim yas tsis zoo. Los ntawm cov kev pom ntawm qhov ua tau zoo thiab raug nqi txo, nws yog qhov zoo tshaj plaws los siv cov viscosity hec ua ke.
3. Incorporation Txoj Kev hauv looj xim
Deg-kho kom zoo rau HEC tuaj yeem ntxiv rau hauv cov hmoov qhuav lossis daim slurry. Cov hmoov nplej qhuav yog ncaj qha ntxiv rau cov xim sib tsoo. Cov PH ntawm qhov kev sib ntxiv yuav tsum yog 7 lossis qis dua. Cov txheej txheem alkaline xws li dispersants tuaj yeem ntxiv tom qab HEC tau raug kaw thiab tag nrho cov dispersed. Slurry ua nrog Hec yuav tsum tau sib xyaw rau hauv slurry ua ntej HEC tau muaj sijhawm txaus rau cov dej thiab ua kom tuab. HEC slurries kuj tseem tuaj yeem npaj nrog glycol-raws li coalescing cov neeg sawv cev.
4. Cov xim tsis zoo ntawm cov xim pleev xim
Dej-soluble HEC biodegrades thaum nthuav tawm cov pwm uas muaj tshwj xeeb rau cellulose thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws cov derivatives thiab nws txoj kev ua haujlwm. Ntxiv cov tshuaj tiv thaiv kom pleev xim rau ib leeg tsis txaus, txhua yam yuav tsum yog enzyme dawb. Cov tsheb ntau lawm ntawm cov xim pleev xim yas yuav tsum tau ceev cia kom huv thiab txhua yam khoom siv yuav tsum tsis tu ncua ua rau chav 0.5% formalin lossis 0.1% mercury tov.
Lub sij hawm ncua: Nov-02-2022