Cov nplaum nplaum ua ib lub luag haujlwm tseem ceeb hauv kev tsim kho kev tsim kho, muab cov kev daws teeb meem ruaj khov thiab zoo nkauj rau cov vuas nplaum rau ntau qhov chaw. Qhov ua tau zoo ntawm cov vile adhesives nyob ntawm cov ntsiab lus ntawm cov tseem ceeb ntxiv, ntawm cov uas redispersible polymers thiab cellulose yog ob qho khoom xyaw tseem ceeb.
1. Redispersible polymers:
1.1 Kev Txhais Lus thiab Khoom:
Redispersible polymers yog hmoov additives tau los ntawm cov tshuaj tsuag kom qhuav polymer emulsions lossis dispersions. Cov neeg polymers feem ntau yog ua raws cov vinyl acetate, ethylene, acrylics lossis lwm yam copolymers. Cov hmoov daim hmoov yog yooj yim los daws thiab tuaj yeem koom nrog rau hauv cov vuas luaj nplaum.
1.2 Txhim Kho Adhesion:
Cov neeg rov ua haujlwm polymers ho txhim kho cov nplaum ntawm cov nplais nplaum rau ntau yam ntawm substrates. Cov polymer dries los ua ib zaj duab xis yooj yim, nplaum uas tsim cov kev sib raug zoo ntawm cov nplaum thiab cov nplais thiab substrate. Qhov ua kom zoo dua adhesion yog qhov tseem ceeb los ua kom muaj kev ruaj khov thiab muaj kev ruaj ntseg ntawm cov nplais saum npoo av.
1.3 yooj thiab tawg tsis kam:
Qhov sib ntxiv ntawm cov refispersible polymer muab cov nplais nplaum nplaum, cia nws yoog kom haum rau kev txav ntawm lub substrate yam tsis muaj kev tawg. Qhov kev hloov pauv no yog qhov tshwj xeeb tshaj yog nyob hauv ib puag ncig uas yog kev hloov pauv hloov pauv tuaj yeem tshwm sim, tiv thaiv kev sib tsoo uas tuaj yeem ua rau muaj kev ncaj ncees ntawm cov nplais.
1.4 Dej Kuj:
Cov polymer recispersible polymer ua rau cov dej tsis kam ntawm cov nplais nplaum. Cov yeeb yaj kiab polymer uas ua rau nws dries ua raws li kev thaiv, tiv thaiv dej los ntawm kev nkag siab thiab tiv thaiv cov nyiaj txhiv. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv cov chaw noo xws li chav da dej thiab chav ua noj, cov av noo nyob qhov twg muaj cov av noo siab.
1.5 Kev Tsim Kho thiab Qhib Teev:
Lub zog rheological ntawm redispersible polymers ua tiav lub luag haujlwm tseem ceeb hauv kev thov kev ua tau ntawm cov vuas luaj. Lawv pab tswj kom haum raws li ib txwm ua kom haum thiab ua kom yooj yim daim ntawv thov yooj yim. Tsis tas li ntawd, cov recispersible polymer pab txuas lub sij hawm qhib ntawm cov nplaum, muab teeb meem txaus los kho cov nplais nqaij ua ntej cov nplaum.
2. Cellulose:
2.1 Kev Txhais Lus thiab Hom:
Cellulose yog lub ntuj polymer muab tau los ntawm tsob nroj qhob phab ntsa thiab feem ntau yog siv los ua kev ntxiv hauv cov nplais nplaum. Cellulose muaj kev hais tsis hais, xws li methylcellulose (MC) thiab hydroxyethylcelleculose (HEC), yog nquag siv vim lawv cov dej ua tau zoo thiab thickening.
2.2 Dej Cia:
Ib qho ntawm cov haujlwm tseem ceeb ntawm cellulose rau hauv cov nplais nplaum yog nws lub peev xwm los khaws dej. Qhov tshwj xeeb no txuas lub sij hawm qhib ntawm cov nplaum, uas tsis muaj peev xwm txuas ntxiv. Thaum cellulose nqus dej, nws tsim cov gel-zoo li cov qauv uas tiv thaiv cov nplaum los ntawm kev ziab tawm sai sai thaum daim ntawv thov.
2.3 txhim kho cov txheej txheem thiab sag tiv thaiv:
Cellulose txhim kho kev ua haujlwm ntawm cov nplais nplaum los ntawm kev tiv thaiv sagging thaum lub sijhawm ntsug. Lub thickening nyhuv ntawm cellulose pab tus nplaum kom tswj nws cov duab ntawm phab ntsa, kom ntseeg tau tias cov nplais uas tsis muaj kev tsaus muag.
2.4 Muaj kev txiav:
Cellulose tuaj yeem txo cov shrinkage ntawm cov pobzeb nplaum thaum lub sijhawm ua kom qhuav. Qhov no yog qhov tseem ceeb vim tias muaj ntau yam shrinkage tuaj yeem ua rau kev tsim cov voids thiab cov kab nrib pleb, kev hloov tag nrho ntawm kev sib cog lus.
2.5 Cov nyhuv ntawm lub zog tensile:
Pobzeb cov nplaum muaj cov cellulose kom nce lawv lub zog tensile. Qhov no yog qhov tshwj xeeb tshaj yog nyob hauv cov cheeb tsam uas muaj kev thauj khoom hnyav lossis siab, vim tias nws ua rau txhua yam ua tiav thiab kev ua tau zoo ntawm cov pobzeb nto.
3. Synergistic nyhuv ntawm redispersible polymer thiab cellulose:
3.1 sib haum:
Redispersible polymers thiab cellulose feem ntau xaiv rau lawv cov kev sib raug zoo nrog txhua lwm yam thiab lwm yam khoom xyaw hauv cov nplais nplaum nplaum. Qhov sib xyaw no ua kom muaj kev sib xyaw homogeneous uas ua kom cov txiaj ntsig ntau ntawm txhua tus ntxiv.
3.2 Kev sib koom ua ke ua ke:
Kev sib xyaw ntawm cov refispersible polymer thiab cellulose tsim cov nyhuv syergistic ntawm kev sib raug zoo. Cov yeeb yaj kiab hloov tau tsim los ntawm cov polymersible polymers tau txhim kho cov dej-khaws cia ntawm cellulose, ua rau muaj zog, ruaj khov thiab ua haujlwm nplaum.
3.3 Txhim kho kev ua tau zoo:
Cov refispersible polymer thiab cellulose ua ke txhim kho cov khoom ua ke ntawm cov nplais nplaum, muab cov khoom nplaum zoo dua, cov dej tsis kam, cov txheej txheem dej tsis taus, cov txheej txheem dej tsis txaus siab thiab ua kom tiav. Qhov kev sib xyaw ua ke no yog qhov zoo tshaj plaws thiab qhov tseem ceeb hauv cov ntawv thov uas xav tau kev txhim khu kev qha thiab ntev-ntev.
Kev sib xyaw ua ke cov polymers thiab cellulose rau hauv cov nplais nplaum yog lub tswv yim thiab muaj pov thawj xyaum ua kev tsim kho. Cov tshuaj ntxiv no ua si lub luag haujlwm tseem ceeb hauv kev txhim kho adhesion, yooj yim, dej tsis kam, cov txheej txheem ua tiav thiab ntev ntev. Lub synergy ntawm redispersible polymers thiab cellulose tshwm sim hauv kev ntsuas cov khoom nplaum uas tau raws li qhov xav tau ntawm cov haujlwm tsim kho niaj hnub no. Raws li thev naus laus zis thiab kev tshawb fawb txuas ntxiv ua ntej, kev nrhav tshiab hauv cov nplais nplaum nplaum yuav tsum tshwm sim, nrog txuas ntxiv ntawm cov ntaub ntawv hauv tsev.
Lub Sijhawm Post: Dec-26-2023