HEC hauv cov xim Latex

1. Kev Txheeb Xyuas Tseem Ceeb ntawm HEC

Hydroxyethyl Cellulose (HEC)yog ib qho polymer uas tsis yog ionic uas yaj tau hauv dej, uas yog ua los ntawm kev sib xyaw cellulose nrog ethylene oxide tom qab alkalization. Ua ib qho thickener uas yaj tau hauv dej zoo heev, HEC ua lub luag haujlwm tseem ceeb hauv cov xim latex. Lub hydroxyethyl substituent hauv nws cov qauv molecular muab nws cov dej solubility zoo heev thiab kev ruaj khov tshuaj, ua rau nws yog ib qho ntawm cov cellulose ether thickeners feem ntau siv hauv kev lag luam xim dej.

2. Cov yam ntxwv tseem ceeb ntawm HEC hauv cov xim pleev xim latex

Kev ua kom tuab zoo heev

Qhov tseem ceeb tshaj plaws ntawm HEC yog nws lub peev xwm ua kom tuab zoo heev:

Kev ua kom tuab siab: qhov ntxiv tsawg heev (feem ntau yog 0.2% -1.0% ntawm tag nrho cov mis) tuaj yeem ua rau kom muaj viscosity ntawm lub kaw lus ntau ntxiv

Cov yam ntxwv ntawm cov kua dej pseudoplastic: viscosity siab thaum static, viscosity txo qis thaum lub sijhawm tsim kho shear, uas tsis yog tsuas yog ua kom muaj kev ruaj khov ntawm kev khaws cia tab sis kuj pab txhawb kev txhuam.

Kev hloov kho viscosity: HEC cov khoom nrog cov qhov hnyav molecular sib txawv tuaj yeem muab cov viscosity ntau yam los ntawm ntau txhiab mus rau kaum txhiab tus mPa · s

Kev tswj hwm kev ua haujlwm rheological zoo heev

HEC tuaj yeem txhim kho cov khoom rheological ntawm cov xim latex:

Tiv thaiv kev poob qis: tiv thaiv cov xim kom tsis txhob poob qis thaum siv rau ntawm cov chaw ntsug

Kev ntws zoo thiab du: tuaj yeem ua kom tiaj tus tom qab txhuam, txo cov cim txhuam

Kev khaws dej nruab nrab: ncua kev ua kom dej qhuav thiab ua kom lub sijhawm qhib ntev dua

Kev sib raug zoo thiab kev ruaj khov zoo heev

HEC hauv cov xim latex qhia tau hais tias:

Kev hloov pauv pH dav dav: kev ua haujlwm ruaj khov hauv pH ntau ntawm 2-12

Kev kam rau electrolyte zoo heev: tsis cuam tshuam los ntawm cov ntsev hauv lub cev

Kev ruaj khov zoo: tsis yooj yim rau stratify lossis precipitate thaum lub sijhawm ntev cia

Kev tiv thaiv ib puag ncig thiab kev nyab xeeb yam ntxwv

Ua ib qho khoom siv ntsuab, HEC muaj cov yam ntxwv hauv qab no:

Tsis muaj tshuaj lom thiab tsis ua rau muaj kev phom sij: tsis muaj APEO, formaldehyde thiab lwm yam tshuaj lom

Biodegradable: tuaj yeem decomposed los ntawm cov kab mob me me, tus phooj ywg ib puag ncig

Cov yam ntxwv VOC qis: ua tau raws li qhov yuav tsum tau ua ntawm cov txheej txheem ib puag ncig zoo

3. Kev ua haujlwm ntawm HEC hauv cov xim pleev xim latex

Ua kom lub kaw lus dispersion ruaj khov

HEC stabilizes pigment thiab filler particles los ntawm cov mechanisms hauv qab no:

Ua kom cov viscosity ntawm cov theem txuas ntxiv mus thiab qeeb qeeb ntawm cov sedimentation ntawm cov khoom me me

Tsim ib lub qauv network peb-seem kom tiv thaiv kev sib sau ua ke ntawm cov khoom me me

Tsim cov teebmeem steric hindrance nrog cov khoom latex

Txhim kho kev ua tau zoo ntawm kev tsim kho

HEC ua kom zoo dua qhov kev ua tau zoo ntawm cov xim latex:

Kho qhov viscosity kom cov xim yooj yim dov, txhuam lossis tsuag.

Tswj kev ua haujlwm ntawm kev txau dej thiab txo qhov poob ntawm kev tsim kho

Ntev lub sijhawm ntub dej rau kev ua cov pob qij txha yooj yim

Txhim kho qhov zoo ntawm cov xim pleev xim

HEC pab tsim cov zaj duab xis pleev xim zoo:

Txhawb kev faib cov pigments sib npaug thiab txhim kho lub zog zais cia

Txo qhov ntsws thiab tawg thaum lub sijhawm ziab

Txhim kho qhov ntom ntawm cov xim pleev xim thiab txhim kho kev tiv thaiv txhuam

4. Kev sib piv zoo ntawm HEC nrog lwm cov thickeners

Piv nrog cov thickeners inorganic

Piv nrog bentonite, magnesium txhuas silicate, thiab lwm yam.:

Kev ua kom tuab dua

Tsis cuam tshuam rau qhov ci ntsa iab ntawm cov xim pleev xim

Tsis ua rau muaj kev hloov pauv ntawm tus nqi pH ntawm lub kaw lus

Piv nrog cov khoom siv polymer thickeners

Piv nrog polyurethanes (HEUR) thiab acrylics (HASE):

Tus nqi sib tw ntau dua

Tsawg dua cuam tshuam los ntawm kev hloov pauv mis

Kev ruaj khov zoo dua qub

Piv nrog rau lwm cov cellulose ethers

Piv nrog methyl cellulose (MC) thiab hydroxypropyl methyl cellulose (HPMC):

Zoo dua solubility, tsis muaj gel kub txwv

Zoo dua mildew tsis kam

Kev sib raug zoo dua nrog cov emulsions

5. Cov yam ntxwv ntawm daim ntawv thov ntawm HEC hauv cov xim pleev xim tshwj xeeb

Hauv cov xim pleev xim latex ci ntsa iab

Muab cov qauv viscosity nruab nrab yam tsis cuam tshuam rau gloss

Txo qhov sib cais dej ntawm cov kab ke PVC siab

Pab cov hmoov txhuas thiab lwm yam xim pigments kom sib phim

Hauv cov xim pleev xim latex uas ywj pheej

Sib npaug qhov kev tsis sib haum xeeb ntawm elasticity thiab anti-sagging

Tiv thaiv kom tsis txhob ntub dej thaum lub sijhawm txheej tuab

Tswj kev ua haujlwm rov qab ntawm lub txheej

Hauv cov xim latex ua haujlwm tau zoo

Tsis cuam tshuam rau cov txheej txheem antibacterial = Kev cuam tshuam rau qhov ua tau zoo ntawm cov khoom xyaw nquag

Muab kev ua haujlwm zoo rau kev ncua kev kawm rau cov txheej txheem rwb thaiv tsev thermal

Ua ke nrog cov tshuaj preservatives kom ntev lub txee lub neej hauv lub kaus poom

6. Kev ceev faj thaum siv HEC

Cov txheej txheem yaj: Yuav tsum siv txoj kev yaj kom zoo kom tiv thaiv kev sib sau ua ke. Nws raug pom zoo kom sib tov nrog cov hmoov qhuav lossis npaj ua ntej-gel ua ntej

Lub sijhawm ntxiv: Feem ntau ntxiv rau theem sib tov xim kom tsis txhob kov ncaj qha nrog qee cov tshuaj dispersants

Kev xaiv sib xws: Feem ntau siv ua ke nrog lwm hom thickeners kom ua tiav cov teebmeem synergistic

Cov xwm txheej khaws cia: Nws yuav tsum tau kaw thiab khaws cia rau hauv qhov chaw qhuav kom tiv thaiv kev nqus dej noo thiab agglomeration

7. Cov qauv kev loj hlob yav tom ntej

Nrog kev nce qib ntawm cov thev naus laus zis pleev xim latex, cov khoom HEC kuj tseem niaj hnub tsim kho tshiab:

HEC uas tsis muaj tshauv ntau ua rau cov xim pleev xim tsis zoo

HEC tam sim ntawd ua kom yooj yim rau cov txheej txheem ntau lawm

HEC kho qhov chaw ua kom zoo dua qhov kev ua tau zoo ntawm kev sib kis

Ua ke nrog nanotechnology los tsim cov khoom siv ntau yam

HECNyob hauv txoj haujlwm tseem ceeb hauv kev ua xim latex nrog nws cov yam ntxwv ua tau zoo tshwj xeeb. Nws cov nyhuv thickening zoo heev, kev ua haujlwm zoo hauv kev tsim kho thiab cov yam ntxwv khaws cia ruaj khov ua rau nws yog ib qho ntawm cov thickeners nyiam rau cov neeg tsim xim dej. Nrog rau cov kev cai tiv thaiv ib puag ncig thiab kev txhim kho tas mus li ntawm cov txheej txheem txheej txheem, daim ntawv thov HEC hauv cov xim latex yuav dav dua.