Dab tsi yog titanium dioxide?
Lub ntsiab tivthaiv ntawm titanium dioxide yog TIO2, uas yog ib qho tseem ceeb inorganic chemical pigment nyob rau hauv daim ntawv ntawm ib tug dawb khoom los yog hmoov. Nws yog non-toxic, muaj siab whiteness thiab brightness, thiab yog suav tias yog qhov zoo tshaj plaws dawb pigment rau kev txhim kho cov khoom whiteness. Nws yog dav siv hauv kev lag luam xws li coatings, plastics, roj hmab, ntawv, number case, ceramics, iav, thiab lwm yam.
Ⅰ.Titanium dioxide kev lag luam saw daim duab:
(1) Cov dej ntws ntawm titanium dioxide kev lag luam saw muaj cov khoom siv raw, suav nrog ilmenite, titanium concentrate, rutile, thiab lwm yam;
(2) Cov midstream hais txog cov khoom titanium dioxide.
(3) Cov dej hauv qab yog daim ntawv thov ntawm titanium dioxide.Titanium dioxide yog dav siv nyob rau hauv ntau yam teb xws li txheej, yas, papermaking, number case, roj hmab, thiab lwm yam.
Ⅱ.Cov qauv siv lead ua ntawm titanium dioxide:
Titanium dioxide yog ib hom polymorphous compound, uas muaj peb hom siv lead ua nyob rau hauv cov xwm, xws li anatase, rutile thiab brookite.
Ob leeg rutile thiab anatase muaj nyob rau hauv tetragonal siv lead ua system, uas ruaj khov nyob rau hauv ib txwm kub; brookite belongs rau orthorhombic siv lead ua system, nrog cov qauv siv lead ua tsis ruaj khov, yog li nws muaj nqis me ntsis hauv kev lag luam tam sim no.
Ntawm peb cov qauv, rutile theem yog qhov ruaj khov tshaj plaws. Anatase theem yuav irreversibly hloov mus rau rutile theem siab tshaj 900 ° C, thaum brookite theem yuav irreversibly hloov mus rau hauv rutile theem siab tshaj 650 ° C.
(1) Rutile theem titanium dioxide
Nyob rau hauv rutile theem titanium dioxide, Ti atoms nyob rau hauv nruab nrab ntawm lub siv lead ua lattice, thiab rau oxygen atoms nyob rau ntawm lub ces kaum ntawm lub titanium-oxygen octahedron. Txhua octahedron txuas nrog 10 ib puag ncig octahedrons (xws li yim sib koom vertices thiab ob qho kev sib koom), thiab ob lub TiO2 molecules tsim ib lub cell.
Schematic daim duab ntawm siv lead ua cell ntawm rutile theem titanium dioxide (sab laug)
Txoj kev sib txuas ntawm titanium oxide octahedron (txoj cai)
(2) Anatase theem titanium dioxide
Nyob rau hauv anatase theem titanium dioxide, txhua titanium-oxygen octahedron txuas nrog 8 nyob ib puag ncig octahedrons (4 sib koom npoo thiab 4 sib koom vertices), thiab 4 TiO2 molecules tsim ib chav tsev cell.
Schematic daim duab ntawm siv lead ua cell ntawm rutile theem titanium dioxide (sab laug)
Txoj kev sib txuas ntawm titanium oxide octahedron (txoj cai)
Ⅲ.Txoj Kev Npaj ntawm Titanium Dioxide:
Kev tsim cov txheej txheem ntawm titanium dioxide feem ntau suav nrog cov txheej txheem sulfuric acid thiab txheej txheem chlorination.
(1) Cov txheej txheem sulfuric acid
Cov txheej txheem sulfuric acid ntawm titanium dioxide ntau lawm suav nrog acidolysis cov tshuaj tiv thaiv ntawm titanium hlau hmoov nrog concentrated sulfuric acid los tsim titanium sulfate, uas yog ces hydrolyzed los tsim metatitanic acid. Tom qab calcination thiab crushing, titanium dioxide khoom tau txais. Txoj kev no tuaj yeem tsim anatase thiab rutile titanium dioxide.
(2) Cov txheej txheem chlorination
Cov txheej txheem chlorination ntawm titanium dioxide ntau lawm suav nrog kev sib xyaw rutile lossis high-titanium slag hmoov nrog coke thiab tom qab ntawd nqa tawm cov chlorination kub los tsim titanium tetrachloride. Tom qab kub-kub oxidation, titanium dioxide khoom yog tau los ntawm kev pom, dej ntxuav, ziab, thiab crushing. Cov txheej txheem chlorination ntawm titanium dioxide ntau lawm tuaj yeem tsim cov khoom rutile nkaus xwb.
Yuav ua li cas paub qhov tseeb ntawm titanium dioxide?
I. Lub cev txoj kev:
(1)Txoj kev yooj yim tshaj plaws yog los sib piv qhov kev ntxhib los mos los ntawm kev kov. Fake titanium dioxide zoo li smoother, thaum tiag tiag titanium dioxide hnov rougher.
(2)Los ntawm kev yaug nrog dej, yog tias koj muab qee cov titanium dioxide rau ntawm koj txhais tes, qhov cuav yog ib qho yooj yim los ntxuav, thaum qhov tseeb tsis yooj yim los ntxuav.
(3)Nqa ib khob dej huv thiab tso titanium dioxide rau hauv nws. Ib qho uas ntab mus rau saum npoo yog qhov tseeb, thaum tus uas nyob hauv qab yog cuav (txoj kev no yuav tsis ua haujlwm rau cov khoom siv los yog hloov kho).
(4)Xyuas nws solubility hauv dej. Feem ntau, titanium dioxide yog soluble hauv dej (tshwj tsis yog rau titanium dioxide tshwj xeeb tsim rau cov yas, inks, thiab qee cov hluavtaws titanium dioxide, uas yog insoluble hauv dej).
II. Cov txheej txheem tshuaj:
(1) Yog tias cov hmoov calcium ntxiv: Ntxiv hydrochloric acid yuav ua rau muaj zog heev nrog lub suab squeaking, nrog rau kev tsim cov npuas ntau (vim calcium carbonate reacts nrog acid los tsim carbon dioxide).
(2) Yog tias lithopone ntxiv: Ntxiv dilute sulfuric acid lossis hydrochloric acid yuav ua rau lub qe tsis hnov tsw.
(3) Yog tias tus qauv yog hydrophobic, ntxiv hydrochloric acid yuav tsis ua rau cov tshuaj tiv thaiv. Txawm li cas los xij, tom qab ntub nws nrog ethanol thiab tom qab ntawd ntxiv hydrochloric acid, yog tias ua npuas, nws ua pov thawj tias cov qauv muaj cov hmoov calcium carbonate coated.
III. Kuj tseem muaj ob txoj hauv kev zoo:
(1) Los ntawm kev siv tib lub mis ntawm PP + 30% GF + 5% PP-G-MAH + 0.5% titanium dioxide hmoov, qhov qis zog ntawm cov khoom tshwm sim yog, qhov tseeb dua cov titanium dioxide (rutile) yog.
(2) Xaiv cov pob tshab, xws li pob tshab ABS nrog 0.5% titanium dioxide hmoov ntxiv. Ntsuas nws lub teeb transmittance. Qhov qis dua lub teeb xa hluav taws xob yog, qhov tseeb dua cov titanium dioxide hmoov yog.
Post lub sij hawm: May-31-2024
