1. Hom tuab thiab xaim hluav taws xob
(1) Cov ntaub tuab ntxiv:
Inoracicic thickeners hauv cov tshuab dej yog mas class. Xws li: Bentonite. Kaolin thiab diatomaceous ntiaj teb (lub ntsiab tivthaiv yog siio2, uas muaj cov qauv sib dhos) yog qee zaum siv ua cov neeg txo qis vim lawv cov khoom ncua. Bentonite yog cov neeg siv dav ntau vim yog nws cov dej ntws siab-o o. Bentonite (Bentonite), tseem hu ua Bentonite, Bentonite, thiab lwm yam me me Alkosilice MEATELY, thiab lwm yam (NA, CA) (AL, MG) 6 (SI4O10) 3 (Oh) 6 • Nh2o. Kev nthuav dav ntawm Bentonite yog qhia los ntawm kev nthuav dav, uas yog, qhov ntim ntawm dilute hydrodoric acid acid yog hu ua kev nthuav dav, qhia nyob rau hauv mL / gram. Tom qab cov bentonite thickener absonbs absombs dej thiab swells, lub ntim tuaj yeem ncav tau ob peb zaug lossis kaum lub zog nrog rau lwm cov hmoov hauv txheej txheej txheej. Lub cev muaj qhov ua tsis zoo. Ib qho ntxiv, thaum kev tsim khoom, nws tuaj yeem tsav lwm yam hmoov los ua ib qho kev tawm tsam stratification, yog li nws pab tau zoo heev txhawm rau txhim kho kev ruaj ntseg ntawm cov kab ke.
Tab sis ntau sodium-based bentonites tau hloov los ntawm calcium-bentonite bentonite los ntawm sodium conversion. Nyob rau tib lub sijhawm sodiumization, ntau tus kabmob ions xws li calcium ions thiab sodium ions yuav tsim tawm. Yog tias cov ntsiab lus ntawm cov cations hauv lub system yog dhau lawm, ntau ntawm kev them nyiaj tsis zoo nyob rau ntawm qhov chaw tsis zoo xws li o thiab flocculation ntawm emulsion. Ntawm qhov tod tes, cov calcium no tseem yuav muaj cov kev mob tshwm sim rau cov neeg tsis txaus siab, ua rau cov txheej txheem dispersant), ua rau txheej txheej tsis zoo, ua kom tuab tuab, thicker lossis tuab tuab. Nag daus loj thiab flocculation tshwm sim. Tsis tas li ntawd, cov nyhuv tuab ntawm bentonite tsuas yog tso rau cov hmoov kom nqus dej, yog li nws yuav tsis muaj zog rau cov txheej txheem uas yuav tsum muaj kev cuam tshuam zoo. Yog li ntawd, bentonite inoracic inoracic thickeners tsis tshua siv nyob rau hauv looj cov xim tsev, thiab tsuas yog siv me me hauv cov xim muaj xim tsawg dua lossis txhuam cov xim looj. Txawm li cas los xij, nyob rau hauv xyoo tsis ntev los no, qee cov ntaub ntawv tau qhia tias kev hemmings 'Bentone®lt. Kev hloov kho thiab ua kom zoo nkauj kom zoo nkauj thiab ua kom zoo nkauj tau zoo anti-sedimentation thiab atomization tshwm sim thaum siv rau latex xim txau tshuab.
(2) cellulose:
Cellulose yog lub ntuj polymer tsim los ntawm kev hws ntawm β-glucose. Siv cov yam ntxwv ntawm cov pab pawg hydroxyl hauv lub nplhaib glucosyl hauv, cellulose tuaj yeem yauv khoom muaj ntau yam kev tawm tsam los tsim cov kev ua haujlwm ntawm derivatives. Ntawm lawv, Esterification thiab Ethegification cov tshuaj tiv thaiv tau. Lub cellulose ester lossis cellulose ether derivatives yog qhov tseem ceeb tshaj plaws cellule derivatives. Cov khoom lag luam uas nquag siv yog carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, hydroxyprropy cellulose thiab lwm yam. Because carboxymethyl cellulose contains sodium ions that are easily soluble in water, it has poor water resistance, and the number of substituents on its main chain is small, so it is easily decomposed by bacterial corrosion, reducing the viscosity of the aqueous solution and making it smelly, etc. Phenomenon, rarely used in latex paint, generally used in low-grade polyvinyl alcohol glue paint and putty. Cov dej xaus tus nqi ntawm methylcellulose feem ntau qis dua qis dua li ntawm hydroxyethylcellulose. Ib qho ntxiv, yuav muaj ib qho me me ntawm cov txheej txheem insoluble thaum lub ntsej muag sib cais, uas yuav cuam tshuam ntawm cov yeeb yaj kiab txheej, yog li nws tsis tshua siv siv nyob rau hauv cov xim pleev xim. Txawm li cas los xij, cov chaw nruj ntawm cov tshuaj methyl yog qis dua qhov uas ntawm lwm cov kev daws teeb meem aqueous, yog li nws yog ib qho zoo ntawm cellener siv hauv putty. HydroxyPropy muag methylcellulose kuj yog lub cellulose tuab siv nyob rau hauv lub teb, thiab tam sim no tsuas yog siv nyob rau hauv cov cement (lossis lwm yam hauv inorganic binders). Hydroxyethyl cellulose yog dav siv nyob rau hauv looj cov xim pleev xim vim tias nws cov dej solubility thiab dej khaws cia. Piv nrog lwm cov celluloses, nws muaj tsawg dua rau txheej txheej zaj duab xis ua tau zoo. Qhov zoo ntawm hydroxyethyl cellulose muaj xws li kev nqus dej siab, qhov sib xyaw zoo, muaj kev cia khoom zoo, thiab zoo popy ntawm viscosity. Qhov tsis zoo yog cov tsis zoo ua kom muaj kua thiab txaws tsis zoo. Txhawm rau txhim kho cov kev tsis txaus siab no, kev hloov kho hydrophobic tau tshwm sim. Kev sib deev-txuam hydroxyethylcellulose (HEC) xws li natrosolplus330, 331
(3) Polycarboxylates:
Nyob rau hauv no polycarboxylate, qhov hnyav molecular hnyav yog qhov tuab dua, thiab qhov hnyav molecular hnyav yog qhov tsis txaus ntseeg. Lawv tsuas yog adsorb dej lwg me nyob rau hauv lub ntsiab ntaub ntawm cov kab ke, uas nce viscosity ntawm cov sij hawm dispersed ntawm cov kev faib tawm; Ib qho ntxiv, lawv kuj tseem tuaj yeem raug adsorbed nyob rau saum npoo ntawm cov txheej txheej ntawm txheej txheej ntawm cov yas, thiab ua kom cov viscosity ntawm cov theem hauv lub latex. Txawm li cas los xij, hom tuab no muaj qhov tsis tshua muaj tuab, yog li nws maj mam tshem tawm hauv cov ntawv thov txheej. Tam sim no hom tuab no tsuas yog siv nyob rau hauv lub thickening ntawm cov xim muab tshuaj txhuam, yog li nws yog ib qho zoo rau qhov dispersibility yog qhov muaj txiaj ntsig zoo thiab kev cia khoom ruaj khov ntawm cov xim muab tshuaj txhuam.
(4) alkali-o o thickener:
Muaj ob lub ntsiab ntawm alkali-o o cov thickeners: dog dig alkali-o o cov thickeners thiab cov phooj ywg alkali-o. Qhov sib txawv loj tshaj plaws ntawm lawv yog qhov sib txawv hauv cov kev koom siab uas muaj nyob hauv cov saw mole loj. Kev sib txuam ua ke alkali-o o cov thickeners yog copolymerized nrog txuam nrog cov qauv, yog li tom qab kev tawm tswv yim hauv aqueous, yog li tom qab cov txheej txheem hauv aqueous, ua rau lub kaw lus viscosity kom sawv sai.
a. Zoo tib yam alkali-o oleative thickener:
Cov Thawj Sawv Cev Tseem Ceeb Hom ntawm dog dig alkali-o o olequener yog ASE-60. ASE-60 feem ntau yog adopts cov copolymerization ntawm methadacrylic thiab ethyl acrylate. Thaum lub sijhawm cov txheej txheem copolymerization, metharicic acid account txog li 1/3 ntawm cov txheej txheem cov khoom siv roj av muaj qee cov txheej txheem ntawm hydrophilicity, thiab neutralizing cov txheej txheem ntsev ua ke. Vim tias qhov kev hloov siab ntawm cov nqi, cov molecular chains yog nthuav dav, uas nce cov viscosity ntawm cov kab mob viscosity thiab ua rau cov nyhuv ua tuab. Txawm li cas los xij, qee zaum lub cev hnyav molecular yog qhov loj heev vim yog qhov kev txiav txim ntawm cov neeg sawv cev sib tw hla. Thaum lub sij hawm nthuav tawm ntawm cov molecular chart, cov molecular saw tsis zoo dispersed nyob rau hauv ib lub sijhawm luv luv. Thaum lub sij hawm lub sijhawm khaws cia ntev, cov molecular chart yog maj ncab, uas nqa post-thickening ntawm viscosity. Tsis tas li ntawd, vim tias muaj ob peb hydrophobic monomers hauv cov xaim pob zeb, yog li no cov tuab ntawm cov tuab, yog li cov tuab tuab no muaj qhov tsis tshua muaj zog, yog li nws tsis tshua siv ib leeg. Nws yog tsuas yog siv ua ke nrog lwm cov thickeners.
b. Koom tes (concord) hom alkali o o cov thickener:
Qhov no zoo ntawm cov tuab tam sim no muaj ntau ntau yam vim kev xaiv ntawm cov neeg sib txuam nrog cov qauv monomers thiab cov qauv ntawm cov qauv molecular. Nws lub ntsiab saw qauv kuj tseem siv tau ntawm metacrylic acid thiab Asthyl acrylate, thiab cov koom tes ua ke yog zoo li kav hlau txais xov, tab sis tsuas yog ib qho kev faib tawm me me. Nws yog cov koom tes no zoo li octopus tortsacles uas ua rau lub luag haujlwm tseem ceeb tshaj plaws hauv cov tuab tuab ntawm cov tuab. Cov pab pawg carboxyl hauv cov qauv yog neutralized thiab ntsev-sib sau, thiab cov molecular saw kuj tseem zoo li cov tuab alkali-o o. Tib tus nqi repulsion tshwm sim, kom cov moleceries saw nthuav tawm. Lub Koom Haum Monomer hauv nws kuj nthuav dav nrog cov qauv molecular, tab sis nws cov qauv muaj ob qho qauv hydellhilic, yog li muaj cov qauv kev ua kom zoo ib yam li cov qauv hauv lwg lossis ntawm cov lwg me me. Cov micelles no yog tsim los ntawm kev sib nrig sib pab ntawm cov koomhaum monomers, thiab qee cov koomhaum monomers adsorb txhua lwm yam los ntawm emulsion hais tawm ntawm emulsion (lossis lwm yam). Tom qab mikelles tsim tawm, lawv txhim kho cov emulsion cov nplais, kom muaj lwm yam ntawm cov molecules ntawm cov molecules ntawm cov kab ke no thiab lub viscosity ntawm lub system nce. Yog li ntawd, cov tuab tuab ntawm cov tuab no, tshwj xeeb tshaj yog nyob rau hauv cov ntsiab lus looj roj hmab, yog li nws tau siv dav hauv cov xim pleev xim. Cov khoom lag luam tseem ceeb hom yog TT-935.
(5) Cov Lus Cog Tseg Sib Koom Tes (lossis Poleether) Thickening thiab Levering Tus Neeg Sawv Cev:
Feem ntau, thickeners muaj hnyav heev molecular hnyav (xws li cellulose hnyav (acrylic acid), thiab lawv cov molecular chains a are daws kom nce cov kab ke. Qhov hnyav molecular ntawm polyurethane (los yog polyetethane (lossis polyethaltians heev, thiab nws feem ntau yog cov neeg lub zog ntawm cov lipophilic, thiab nws feem koom nrog lub zog tseem ceeb. Kev sib cais, yog li txo lub viscosity, yog pab kom zoo rau theem theem ntawm txheej zaj duab xis, yog li nws tuaj yeem ua lub luag haujlwm ntawm Level tus neeg sawv cev. Thaum lub zog shear yog tshem tawm, nws tuaj yeem hloov kho cov kab ke sai. Qhov tshwm sim no tau txais txiaj ntsig no tau txais txiaj ntsig zoo kom txo tau viscosity thiab nce qib theem thaum lub sijhawm kev tsim kho; Thiab tom qab lub zog shear ploj, lub viscosity yuav rov qab kho tam sim ntawd kom nce cov tuab ntawm txheej ua yeeb yaj kiab. Hauv cov ntawv thov siv, peb muaj kev txhawj xeeb ntau ntxiv txog cov nyhuv tuab ntawm cov koom ua ke thickeners ntawm polymer. Lub ntsiab polymer looj cov lus tseem koom nrog hauv cov kab ke, yog li ntawd qhov kev ua kom zoo dua qub (lossis theem siab) cov nyhuv thaum nws qis dua nws qhov kev xav tseem ceeb tshaj plaws; Thaum cov concentration ntawm hom thickening thiab levering tus neeg sawv cev thaum nws tseem ceeb tshaj nws tus kheej, thiab lub viscosity nce sai sai. Yog li ntawd, thaum hom no thickening thiab levering tus neeg sawv cev yog qis dua nws cov kev koom tes loj, thiab cov pa roj hmab uas muaj zog dua, thiab nws cov pa roj hmab uas muaj zog ntxiv nrog qhov nce ntawm cov emulsion. Ib qho ntxiv, qee cov dispersants (lossis acrylic thickeners) muaj lawv cov pawg hydrophobic, yog li cov kab ke ua cov qauv qauv network loj, uas muaj txiaj ntsig zoo rau tuab.
2. Teeb xwm ntawm cov nyias nyias ntawm cov dej sib cais tiv thaiv cov xim looj xwb
Hauv kev tsim qauv ntawm cov xim pleev xim rau cov dej, kev siv cov tuab ntawm cov khoom siv ntawm cov xim yas, xws li kev tsim kho, kev cia khoom thiab qhov tsos. Ntawm no peb tsom rau kev cuam tshuam ntawm kev siv cov thickeners ntawm cia ntawm cov xim looj xwb. Los ntawm cov lus qhia saum toj no, peb tuaj yeem paub tias Bentonite thiab Polycarboxylates: Thickeners yog siv nyob rau hauv qee lub tsho tshwj xeeb tshwj xeeb, uas yuav tsis tau tham txog ntawm no. Peb yuav tsuas yog tham txog cov cellulose feem ntau, alkali o, thiab polyurethane (lossis polyurethane (lossis polyurethane, ib leeg thiab sib cais, cuam tshuam rau cov xim paug ntawm cov xim looj.
Txawm hais tias tuab nrog hydroxyethyl cellulose ib leeg muaj mob hnyav dua hauv dej sib cais, nws yog ib qho yooj yim kom do tusyees. Ib qho kev siv ntawm alkali o oluly butterening tsis muaj dej sib cais thiab nag lossis daus tab sis hnyav ua tuab tom qab ua tuab. Ib qho kev siv ntawm polyurethane tuab, txawm hais tias dej sib cais thiab rov qab ua kom cov dej ua tuab, tab sis cov nag lossis nag los yog qhov nyuaj thiab nyuaj rau do. Thiab nws tau txais hydroxyethyl cellulose thiab alkali o thickening compound, tsis muaj nag los, yooj yim mus do, tab sis kuj muaj cov dej me me. Txawm li cas los xij, thaum hydroxyethyl cellulose thiab polyurethane yog siv los ua tuab, dej sib cais yog qhov tseem ceeb tshaj plaws, tab sis tsis muaj nag lossis daus. Alkali-o o thickening thiab polyurethane tau siv ua ke, txawm hais tias tsis muaj dej sib cais, tab sis tom qab cov av xau dej hauv qab yog qhov nyuaj rau do tusyees. Thiab tus kawg siv ib qho me me ntawm hydroxyethyl cellulose nrog alkali o thiab polyurethane tuab tsis muaj lub xeev tsis muaj nag los yam tsis muaj nag dej. Nws tuaj yeem pom tau tias nyob rau hauv cov acrylic emulsionity nrog hydrothilic hydrothethyl cellulose, tab sis nws tuaj yeem hloov kho cellulose, tab sis nws tuaj yeem hloov tau tusyees yooj yim. Kev siv ntawm hydrophobic alkali o thiab polyurethane (lossis lawv cov compound), tab sis muaj nag lossis daus, uas yog qhov nyuaj rau do tusyees. Kev siv cov cellulose thiab polyurethane compound thickening, tshwm sim nyob rau hauv hydrophilic thiab cov nag lossis daus, tab sis cov av nkos thiab yooj yim rau do. The last formula has the best anti-water separation performance due to a better balance between hydrophilic and lipophilic. Tau kawg, hauv cov txheej txheem tsim qauv tsim, hom emulsions thiab dispersing cov neeg sawv cev thiab lawv cov txiaj ntsig hydrophilic kuj yuav tsum tau txiav txim siab. Tsuas yog thaum lawv mus txog qhov kev sib npaug zoo tuaj yeem yog lub hauv paus ntawm thermodynamic effernodynamic effilibrium thiab muaj cov dej tsis kam.
Nyob rau hauv cov thickening system, lub thickening ntawm cov dej theem qee zaum qee zaum nrog kev nce qib ntawm cov roj theem. Piv txwv, peb feem ntau ntseeg tias cellulose thickenters thicken cov dej theem, tab sis lub cellulose tau muab faib rau hauv theem dej
Lub Sijhawm Post: Feb-14-2025