Txheej txheej txheej yog ib qho kev siv thev naus laus zis hauv kev tsim cov ntawv coated thiab muaj kev cuam tshuam tseem ceeb ntawm cov khoom kawg -siv. Yog li ntawd, coatings yuav tsum tau tsim thiab tsim kom tau raws li cov kev cai tshwj xeeb hais txog txheej txheej txheem thiab luam ntawv; nyob rau hauv lwm yam lus, tus tsim ntawm lub txheej yog ncaj qha mus rau lub hom ntawm coated ntawv raug tsim. Nyob rau hauv cov nqe lus ntawm ntim, txheej txheem coated ntawv tseem yog cov khoom tseem ceeb, tsis tau los ntawm ib tug thev naus laus zis standpoint, muaj ib tug tsav los ua tus tswv cov technologies txuam nrog high-kawg kos duab daim ntawv (gloss-coated ntawv). Cov khoom sib txawv xav tau cov txheej txheem tshwj xeeb, txheej txheej txheej, thiab txheej tshuab. Txawm hais tias txhua yam yuav tsum ua kom tau raws li cov qauv tsim, tau txais kev pom zoo rau cov neeg siv khoom yog qhov tseem ceeb tshaj plaws.
Muaj ntau hom txheej txheej siv rau ntawv, nrog rau cov dej-raws li txheej yog siv dav tshaj plaws. Cov dej muaj pes tsawg leeg -raws li txheej txheej tuaj yeem faib ua plaub yam: pigments, binders, additives, thiab dej. Kev sib xyaw ua ke ntawm plaub yam no yog sib txuas nrog rau qhov zoo ntawm cov ntawv coated tiav. Table 1 hauv qab no qhia txog qhov cuam tshuam ntawm cov txheej txheem ntawm cov ntawv zoo.
Pigments
Pigments muaj xws li av nplaum (dawb av nplaum), calcium carbonate, satin dawb, txhuas hydroxide, titanium dioxide, thiab yas pigments.
1. Av nplaum
Cov av nplaum raug cais los ntawm kev sib xyaw ua ke xws li kaolinite, pyrophyllite, thiab sericite. Kaolinite ntxiv subdivided rau hauv ntau yam xws li txheej txheem kaolin thiab hydrated kaolin; tag nrho cov av nplaum no yog ua lag luam. Txawm li cas los xij, nyob rau hauv cov ntsiab lus ntawm cov ntawv coated, lo lus "kaolin" feem ntau yog siv los xa mus rau pawg kaolinite tag nrho, ua kom zoo sib xws nrog txheej txheej - qib av nplaum.
Kaolin hais yog hexagonal platelets nrog diameters li ntawm 0.3 mus rau 3 micrometers. Qhov sib piv thiab qhov loj me ntawm cov khoom no ncaj qha cuam tshuam qhov zoo ntawm cov xim txheej ntawm daim ntawv. Kaolin yog tam sim no cov xim siv ntau tshaj plaws rau cov ntawv coated vim nws imparts siab gloss rau cov ntawv uas tsis tau luam tawm, yuav tsum muaj qhov sib npaug ntawm cov ntaub ntawv, thiab muaj cov viscosity zoo thiab dispersion yam ntxwv, tso cai rau cov ntsiab lus siab dua hauv cov txheej txheem txheej.
2. Calcium Carbonate
Calcium carbonate yog siv dav hauv cov ntawv coated, qeb thib ob tsuas yog av nplaum raws li kev siv ntim. Calcium carbonate yog tshwj xeeb tshaj yog muaj nyob rau hauv Taiwan; nyob rau xyoo tas los no, nws tau hloov cov av nplaum kim dua. Ntau ntau qib tau tsim los kom haum rau qhov sib txawv ntawm qhov kawg- siv thiab tsim cov txheej txheem rau cov ntawv coated, ua kom pom kev siv calcium carbonate yog qhov tseem ceeb hauv kev tsim cov ntawv txheej. Ua tsaug rau nws qhov ci ntsa iab thiab qhov porosity, calcium carbonate pigment muaj cov cwj pwm zoo heev absorbency, yog li txhim kho kev luam tawm - ua rau nws ua tau zoo heev txawm tias matte - cov ntawv coated tiav.
3. Satin Dawb
Satin dawb yog cov xim dawb synthesized los ntawm slaked txiv qaub thiab barium sulfate; nws tau ntev tau siv los ua cov xim rau cov ntawv kos duab. Nws muaj qhov ci ci zoo heev, gloss, number case absorbency, thiab nto smoothness. Txawm li cas los xij, cov khoom zoo no tuaj nrog cov yam ntxwv xws li cov txheej txheem siab viscosity thiab cov khoom muaj zog o, uas ua rau muaj qhov tsis zoo xws li kev ua haujlwm tsis zoo thaum lub sijhawm txheej txheej txheej thiab kev thov siab rau cov ntawv khi. Keeb kwm, satin dawb feem ntau yog siv nyob rau hauv huab cua- riam txheej formulations; nws nthuav tawm cov kev cov nyom thaum siv hauv siab- cov txheej txheem txheej txheej txheej txheej, yog li nws daim ntawv thov feem ntau txwv rau kev kos duab- cov ntawv qib coated.
4. Aluminium Hydroxide
Muab qhov ci zoo, opacity, thiab number case absorbency.
5. Titanium Dioxide
Titanium dioxide muaj qhov opacity siab heev, ua rau nws yog ib qho kev xaiv rau lub teeb - nyhav coated (LWC) ntawv formulations. Txawm li cas los xij, nws txoj kev siv yog txwv los ntawm nws cov nqi siab thiab abrasive xwm. Nws muaj nyob rau hauv ob daim ntawv crystalline: rutile thiab anatase. Txawm hais tias daim ntawv anatase muaj qhov qis dua me ntsis, nws tau siv dav vim nws cov nqi qis dua thiab siab ci.
6. Yas Pigments
Cov pigments yas tam sim no muaj feem ntau poob rau hauv peb pawg: hom khi, hom khoom, thiab hom hollow, nrog rau ob qhov tom kawg yog feem ntau siv. Thaum lub sij hawm synthesis, qhov sib txawv xws li monomer ratios, qhov pib concentrations, agitation speeds, thiab cov tshuaj tiv thaiv kub yuav manipulated los tswj particle loj, uniformity, stability, thiab cov tshuaj tiv thaiv cov nqi.