Cov txheej ntxiv yog siv rau hauv qhov nyiaj me me hauv cov tsho me, tab sis lawv tuaj yeem txhim kho kev ua tau zoo ntawm cov txheej txheem, thiab tau dhau los ua ib feem tseem ceeb ntawm cov txheej txheem. Thickener yog ib hom rheological ntxiv, uas tsis tuaj yeem tsuas yog thicken txheej thiab tab sis kuj ua rau txheej txheej thiab cov khoom siv hluav taws xob zoo. Nws yog ib chav kawm tseem ceeb ntawm cov khoom sib ntxiv rau cov xim pleev xim rau cov dej nrog cov viscosity tsawg.
1 Hom Dej-Raws Li Cov Xim Xim Thickeners
Tam sim no, muaj ntau yam cov thickeners muaj nyob rau hauv kev ua lag luam, feem ntau yog suav nrog inorganic thickeners, cellulos, polyacrylates thiab kev sib haum polyurethane thickenters. Inorganic thickener yog ib hom ntxhia gel uas nqus dej thiab nthuav tawm los ua thixotrotropy. Muaj feem ntau bentonite, cov neeg ua kom tau, txhuas silicate, thiab lwm yam, ntawm qhov uas bentonite yog feem ntau siv. Cellulosic thickeners muaj keeb kwm ntev ntawm kev siv thiab muaj ntau ntau yam, suav nrog methylethyl cellulose, thiab lwm yam, uas siv los ua lub zog ntawm cov thickeners. Feem ntau siv ntawm cov no yog hydroxyethyl cellulose. Polyacrylate thickeners tuaj yeem faib ua ob hom: ib qho yog dej-soluble polyacrylate; Lwm tus yog homopolymer lossis copolymer emulsion thickener ntawm acrylic acid thiab methalicic acid. Nws yog acidic hauv nws tus kheej, thiab yuav tsum tau neutralized nrog alkali lossis ammonia dej rau ph 8 ~ 9 kom tau hu ua Acrylic Acid Alkali Oping Thickener. Polyurethane thickeners tau tshiab tsim cov neeg sib deev tuab nyob rau xyoo tas los no.
2 Cov yam ntxwv ntawm ntau cov tuab
2.1 Cellulose thickener
Cellulosic thickeners muaj siab thickening efficiency, tshwj xeeb tshaj yog rau cov thickening ntawm cov dej theem; Lawv tsis tshua muaj kev txwv rau txheej txheej thiab tau siv dav; Lawv tuaj yeem siv tau ntau ntawm PH. Txawm li cas los xij, muaj qhov tsis zoo xws li theem uas tsis zoo, txhais tau thaum cov txheej uas cov menyuam, thiab raug rau cov microbial. Vim tias nws muaj qis viscosity nyob rau hauv siab shear thiab siab viscosity nyob rau hauv lub siab zoo nkauj thiab muaj viscosity ntxiv tom qab txheej, uas tuaj yeem tiv thaiv sagging, tab sis ntawm qhov tod tes, nws ua rau kev tsis zoo. Cov kev tshawb fawb tau pom tias raws li cov txheeb ze hnyav ntawm cov thickener nce, lub ntsej muag ntawm cov xim yas kuj tseem nce. Cellulosic thickeners yog nquag mus rau splashing vim lawv cov neeg txheeb ze cov molecular. Thiab vim tias cellulose yog hydrophilic ntau dua, nws yuav txo cov dej tsis kam ntawm cov xim pleev xim.
2.2 Acrylic thickener
Polyacrylic thickeners muaj cov khoom siv thickening thiab qib theem, thiab muaj kev nkag siab zoo pH thiab muaj cov dej tsis zoo.
2.3 Kev Koom Tes Polyurethane Thickener
Lub Koom Haum Ua Haujlwm Koom Tes Nrog Koom Tes Polyurethane Thickenete tau rhuav tshem hauv qab kev ua ntawm shear zog, thiab lub viscosity txo. Thaum lub zog shear ploj, lub viscosity tuaj yeem rov qab, uas tuaj yeem tiv thaiv cov tshwm sim ntawm sag hauv cov txheej txheem kev tsim kho. Thiab nws viscosity rov qab muaj qee qhov hysteresis, uas yog conducive rau theem ntawm txheej zaj duab xis. Tus txheeb ze cov neeg sib piv (ntau txhiab xyoo (phav phav phav) Polyurethane thickener molecules muaj ob pab pawg hydrophilic muaj qhov muaj zog ntawm cov dej ua ke, uas tuaj yeem txhim kho cov dej tsis kam ntawm cov yeeb yaj kiab txheej. Txij li thaum cov kab txuas ntawm cov kab ke koom nrog hauv lub koom haum, yuav tsis muaj cov txheej flocculation, yog li txheej duab zaj duab xis tuaj yeem yog thiab muaj lub siab loj. Ntau lub zog ntawm cov koom tes polyurethane thickenters yog zoo dua rau lwm lub tshuab thickeners ,, cov khoom sib xyaw ua ke yuav cuam tshuam rau cov neeg siv thickening. Thaum siv cov thickener no, muaj ntau yam ntawm ntau yam ntawm cov tuab ua tau txiav txim siab, thiab kev zam, kev ua yeeb yam siv nyob rau hauv cov txheej sib pab, thiab lwm yam yuav tsum tsis yooj yim hloov.
2.4 Inorganic thickeners
Inorganic thickeners muaj qhov zoo ntawm cov tuab tuab, zoo thixotrostropy, dav Ph ntau, thiab kev ruaj khov zoo. Txawm li cas los xij, txij li Bentonite yog cov hmoov av inorganic nrog cov teeb pom kev zoo zoo, nws tuaj yeem txo cov npoo npoo ntawm txheej yeeb yaj kiab thiab ua zoo li tus neeg sawv cev.
Lub Sijhawm Post: Dec-27-2022