Yuav kom ua tau raws li qhov yuav tsum tau ua 3000 lo lus thiab ua kom cov ntsiab lus nplua nuj, kuv yuav nthuav dav ntxiv rau kev siv cov hmoov kaolin dawb siab hauv ntau yam kev lag luam txheej, xws li kev txheej xim hauv dej hiav txwv thiab kev txheej xim hauv tsheb. Kuv tseem yuav kawm tob dua txog cov txheej txheem tsim khoom, suav nrog cov thev naus laus zis tshiab thiab kev ntsuas kev tswj xyuas zoo. Tsis tas li ntawd, kuv yuav txhim kho cov lus piav qhia txog kev xa khoom thiab kev txhawb nqa kev siv tshuab los ntawm kev ntxiv cov ntsiab lus ntxiv txog kev pabcuam rau cov neeg siv khoom thiab cov qauv kev ua lag luam.

Kev lag luam pleev xim thiab txheej xim yeej ib txwm nrhiav cov xim thiab cov khoom siv uas tuaj yeem ua kom cov xim sib xws, ntev lub neej ntawm cov khoom, thiab ua kom cov nqi tsim khoom zoo dua. Hauv qhov kev tshawb nrhiav no, cov hmoov kaolin dawb siab tau tshwm sim ua cov khoom siv tseem ceeb, pom kev siv dav hauv kev tsim vaj tsev, kev lag luam, thiab kev lag luam ntoo. Tsis zoo li titanium dioxide (TiO₂), uas muaj tus nqi siab thiab muaj feem cuam tshuam rau ib puag ncig, cov hmoov kaolin dawb siab muab kev npog zoo kawg nkaus, cov khoom sib kis zoo dua, thiab kev tiv thaiv huab cua zoo dua. Qhov no ua rau nws yog lwm txoj hauv kev pheej yig lossis cov khoom xyaw ua ke rau TiO₂ hauv cov txheej txheem txheej xim.

Kev npog yog ib qho cim qhia txog kev ua tau zoo rau cov txheej txheej, vim nws qhia txog pes tsawg lub tsho uas yuav tsum tau ua kom tau cov xim sib xws thiab zais cov khoom siv hauv qab. Cov hmoov kaolin dawb siab, uas muaj tus nqi L * ntawm ≥93%, muaj cov qauv zoo li phaj. Thaum muab tso rau hauv zaj duab xis txheej, cov khoom no sib tshooj, tsim ib txheej tuab uas thaiv lub teeb thiab npog qhov tsis sib xws ntawm qhov chaw. Thaum ntxiv rau ntawm qhov concentration ntawm 10% -18% ntawm tag nrho qhov hnyav ntawm cov txheej, ua ke nrog acrylic lossis epoxy resins, cov hmoov kaolin no tuaj yeem ua kom muaj kev npog ntau dua 25% -35%. Ib qho piv txwv tiag tiag los ntawm lub tuam txhab tsim khoom siv hauv Suav teb qhia txog qhov no zoo: los ntawm kev siv cov hmoov no hauv cov xim pleev xim latex rau phab ntsa sab nraud, lawv tau ua tiav kev npog tag nrho ntawm cov phab ntsa pob zeb nrog tsuas yog ib txheej, nrog lub zog zais ntawm ≥98%. Qhov sib piv, xim tsis muaj kaolin xav tau ob txheej. Qhov no tsis yog tsuas yog ua rau 30% txo qis kev siv xim tab sis kuj txo cov nqi khoom siv thiab lub sijhawm tsim kho. Hauv kev siv cov tshuaj pleev xim rau kev lag luam, xws li cov uas siv rau cov tshuab hlau, cov hmoov kaolin uas npog tau zoo heev pab zais cov khawb ntawm cov hlau. Qhov no txo ​​qhov xav tau kev xuab zeb ua ntej, yog li ua rau muaj kev ua haujlwm ntau ntxiv.

Kev tiv thaiv huab cua yog qhov tseem ceeb tshaj plaws rau cov txheej sab nraud, uas pheej raug rau cov khoom ib puag ncig hnyav xws li UV hluav taws xob, nag, qhov kub thiab txias hloov pauv, thiab cov pa phem hauv kev lag luam. Cov tshuaj lom neeg tsis muaj zog thiab cov qauv zoo li phaj ntawm cov hmoov kaolin dawb siab ua lub luag haujlwm ua lub tsho tiv thaiv, tiv thaiv cov zaj duab xis txheej los ntawm kev puas tsuaj UV. Nws cov khoom me me muaj peev xwm cuam tshuam lub teeb UV hauv 280-400 nm, tiv thaiv nws kom tsis txhob nkag mus rau hauv zaj duab xis thiab rhuav tshem cov saw hlau polymer. Kev sim huab cua nrawm dua ua raws li ASTM G154 cov qauv qhia tau hais tias cov txheej sab nraud acrylic uas muaj 15% hmoov kaolin khaws cia 85% ntawm lawv cov xim ci thiab xim qub tom qab 3000 teev ntawm kev raug. Piv txwv li, cov txheej tsis muaj kaolin tsuas yog tswj tau khaws cia 60%. Rau cov txheej ntoo, xws li cov uas siv rau cov rooj tog zaum sab nraum zoov, hmoov kaolin ua rau muaj kev tiv thaiv dej ntau ntxiv. Cov txheej txheej uas muaj 12% kaolin hmoov tau pom tias muaj dej nqus ntawm ≤5% tom qab 24 teev ntawm kev tsau, raws li ASTM D1653 tus qauv, thaum cov txheej txheej tsis hloov pauv muaj dej nqus ntawm 12%. Qhov no ua tau zoo tiv thaiv ntoo kom tsis txhob o thiab ntswj. Ntxiv mus, hmoov kaolin txhim kho qhov kev tiv thaiv txhuam ntawm cov txheej txheem vaj tse. Cov xim latex nrog 10% kaolin hmoov tau tuaj yeem tiv taus ntau dua 5000 lub voj voog txhuam yam tsis muaj kev ploj lossis tev tawm, raws li ASTM D2486 tus qauv, piv rau tsuas yog 2000 lub voj voog rau cov xim txheem. Qhov no ua rau lawv zoo tagnrho rau thaj chaw muaj neeg coob xws li tsev kawm ntawv thiab tsev kho mob.

Kev tsim cov hmoov kaolin dawb siab rau kev lag luam txheej yog ib qho txheej txheem ua tib zoo uas muaj ntau yam kev ua kom huv thiab ua kom dawb kom ua tiav qhov ci ntsa iab thiab huv si tshaj plaws. Txoj kev taug kev pib nrog cov kaolin ore nyoos, uas yog ntxuav ua ntej kom tshem tawm cov xuab zeb thiab cov av xuab zeb. Tom qab ntawd, cov txheej txheem sib cais sib nqus tau siv los txo cov ntsiab lus hlau, lub hom phiaj rau qib Fe₂O₃ ntawm ≤0.2%. Kev ua kom dawb yog ib kauj ruam tseem ceeb, ua tiav los ntawm kev sib xyaw ua ke ntawm cov tshuaj dawb xws li hydrogen peroxide lossis sodium dithionite, nrog rau cov khoom ci ntsa iab kom txhim kho qhov dawb. Tom qab qhov no, kev sib tsoo ntub yog ua tiav kom ua tiav qhov loj me ntawm D50 3-8 μm, sib raug rau qhov loj me ntawm 325-1250. Cov slurry uas tau los tom qab ntawd raug lim thiab ziab ntawm qhov kub ntawm 150-180 ° C los tsim cov hmoov nrog cov dej noo ntawm ≤0.5%. Thaum kawg, cov hmoov raug siev kom ntseeg tau tias muaj qhov sib xws ntawm cov khoom me me. Rau cov txheej txheem dej, kev kho mob hydrophilic ntxiv tuaj yeem siv rau cov hmoov kaolin kom txhim kho nws cov kev sib kis hauv cov kab ke aqueous.

Hauv kev lag luam txheej xim hauv dej hiav txwv, cov hmoov kaolin dawb siab ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom tiv thaiv kev xeb ntawm cov xim pleev xim. Nws cov qauv zoo li phaj tsim txoj hauv kev rau cov neeg ua haujlwm corrosive, qeeb lawv nkag mus rau hauv lub substrate. Cov txheej txheem nkoj hull uas muaj cov hmoov kaolin tau qhia txog lub neej ua haujlwm ntev dua, txo qhov zaus ntawm kev saib xyuas kim thiab kev pleev xim dua. Hauv kev lag luam txheej xim tsheb, hmoov kaolin pab txhawb kom ua tiav qhov tiav du thiab txawm tias. Nws pab txo cov txiaj ntsig ntawm tev txiv kab ntxwv, qhov tsis zoo uas tshwm sim hauv cov xim tsheb, thiab txhim kho qhov zoo nkauj ntawm lub tsheb. Kev ntxiv cov hmoov kaolin kuj ua rau qhov tawv thiab khawb tsis kam ntawm cov txheej xim tsheb, tiv thaiv lub tsheb sab nraud ntawm kev puas tsuaj me me thaum siv txhua hnub.

Cov thev naus laus zis tsim khoom siab heev tab tom tsim kho tas li kom ua kom zoo dua qhov zoo ntawm cov hmoov kaolin dawb siab. Piv txwv li, qee lub tuam txhab tsim khoom tab tom tshawb nrhiav kev siv kev kho ultrasonic thaum lub sijhawm sib tsoo ntub. Cov thev naus laus zis no tuaj yeem rhuav tshem cov khoom me me kaolin kom sib npaug, ua rau muaj qhov faib me me ntawm cov khoom me me. Lwm qhov kev hloov pauv tshiab yog kev siv cov tshuaj dawb bio-based, uas muab lwm txoj hauv kev zoo dua rau ib puag ncig rau cov tshuaj dawb ib txwm muaj. Cov kev tsim kho tshiab no tsis yog tsuas yog txhim kho kev ua tau zoo ntawm cov hmoov kaolin xwb tab sis kuj ua raws li kev thov kev lag luam loj hlob rau kev coj ua tsim khoom ruaj khov.

Kev tswj xyuas zoo yog ib qho tseem ceeb ntawm kev tsim cov hmoov kaolin rau cov txheej. Ntxiv rau cov yam ntxwv tseem ceeb xws li dawb (L * tus nqi) ≥93%, cov ntsiab lus hlau (Fe₂O₃) ≤0.2%, qhov loj me ntawm cov khoom me me D50 3-8 μm, kev nqus roj 28-35 mL / 100g, pH tus nqi 6.5-7.5, thiab qhov ci ntsa iab (457 nm) ≥95%, cov chaw tsim khoom kuj saib xyuas lwm yam xws li cov tshuaj lom neeg ntawm cov hmoov. Cov nqi ntawm qhov chaw thiab cov pab pawg ua haujlwm ntawm cov khoom me me kaolin tuaj yeem cuam tshuam rau lawv qhov kev sib kis hauv cov txheej txheem resin sib txawv. Cov txheej txheem tshuaj ntsuam xyuas siab heev, xws li kev ntsuas zeta thiab Fourier-transform infrared spectroscopy (FTIR), yog siv los piav qhia txog cov khoom ntawm cov hmoov, kom ntseeg tau tias muaj kev sib raug zoo tshaj plaws nrog ntau yam txheej txheem txheej.

Cov saw hlau muab khoom rau cov hmoov kaolin dawb siab yog tsim los ua kom tau raws li ntau yam kev xav tau ntawm kev lag luam txheej. Cov kev xaiv ntim khoom tau tsim rau cov kev xav tau sib txawv ntawm cov neeg siv khoom. Cov chaw ua haujlwm txheej me me tuaj yeem xaiv cov hnab ntawv kraft 25kg, uas yooj yim rau kev tuav thiab khaws cia. Cov chaw tsim khoom txheej loj, ntawm qhov tod tes, tuaj yeem xaiv cov hnab loj 1000kg, nruab nrog cov ntaub thaiv dej noo kom tiv thaiv kev sib sau ua ke thaum thauj mus los thiab khaws cia. Kev xa khoom yog qhov yooj ywm heev, nrog rau kev xa khoom txhua hli mus rau cov chaw loj txheej hauv Tebchaws Europe, North America, thiab Asia. Rau cov xaj ceev, kev xaiv thauj khoom los ntawm huab cua muaj, ua kom xa khoom hauv 3-7 hnub kom ua tau raws li cov sijhawm tsim khoom nruj.

Raws li kev lag luam txheej txheej txuas ntxiv hloov zuj zus, tsav los ntawm qhov kev thov rau cov khoom lag luam uas tsis ua rau ib puag ncig puas tsuaj, VOC qis, thiab cov khoom siv ntev, cov hmoov kaolin dawb siab yuav ua lub luag haujlwm tseem ceeb dua. Nws cov khoom sib xyaw ua ke tshwj xeeb, suav nrog kev npog zoo heev, kev tiv thaiv huab cua zoo dua, thiab kev siv nyiaj tsim nyog, ua rau nws yog cov khoom xyaw tseem ceeb rau cov tuam txhab tsim txheej txheej uas tab tom nrhiav kev sib tw hauv kev ua lag luam. Los ntawm kev siv cov thev naus laus zis tshiab tshaj plaws thiab muab kev txhawb nqa kev txawj ntse, kev lag luam hmoov kaolin tau zoo nyob rau hauv qhov chaw zoo los ua kom tau raws li qhov xav tau ntawm kev lag luam txheej txheej thiab pab txhawb rau kev tsim cov txheej txheej ua haujlwm siab.

Hauv kev lag luam txheej txheem vaj tse, kev siv cov hmoov kaolin dawb siab tau nthuav dav dhau ntawm cov tsev nyob thiab cov tsev lag luam ib txwm muaj. Nws tau siv ntau zuj zus hauv kev kho dua tshiab thiab khaws cia cov tsev keeb kwm. Lub peev xwm ntawm cov hmoov los muab kev npog zoo heev thiab tiv thaiv kev puas tsuaj rau ib puag ncig pab tswj cov qauv qub ntawm cov qauv no thaum ua kom lawv ruaj khov mus sij hawm ntev. Hauv kev lag luam txheej txheem kev lag luam, nrog rau kev loj hlob ntawm cov khoom xws li lub zog rov ua dua tshiab thiab kev tsim kho vaj tse, qhov kev thov rau cov txheej txheem ua haujlwm siab tau nce siab. Hmoov kaolin, nrog nws lub peev xwm los txhim kho kev ua tau zoo ntawm cov txheej txheem, xav tias yuav pom kev siv ntau ntxiv hauv cov cheeb tsam no, ua kom nws txoj haujlwm ua cov khoom ntxiv tseem ceeb hauv kev lag luam txheej txheem.