Lub hauv paus ntsiab lus ntawm fluorescent whitening tus neeg sawv cev
1. Whitening txoj cai
Cov khoom siv organic ntau, cov ntaub ntawv ntuj lossis cov khoom siv dag zog lossis lwm yam ntaub ntawv, xws li ntawv, yas, thiab lwm yam, tsis txhob saib dawb. Feem ntau lawv nqus ntau lub teeb xiav-violet (400 ~ 480nm) dua li lub teeb daj, yog li lawv yuav ntau dua lossis tsawg dua daj.
Fluorescent whitening agents yog dyed rau hauv lub substrate nrog ib tug tej yam dawb huv (xws li textiles, plastics, ntawv, detergents, thiab lwm yam) los ntawm ib tug tej yam txoj kev. Lub substrate no qhia txog thaum pom lub hnub ci (los yog lub teeb ci uas muaj lub teeb txaus ultraviolet). Lub teeb pom kev zoo, thaum lub molecules ntawm fluorescent whitening tus neeg sawv cev ntawm lub substrate nqus lub teeb pom kev ultraviolet nyob rau hauv tshav ntuj uas zoo ib yam nrog nws cov yam ntxwv zaus (txog 340-380}nm) lub zog, thiab ces emits nyob rau hauv daim ntawv ntawm heev kaj thiab gorgeous. fluorescence nyob rau hauv lub xiav-violet (li 410 ~ 460nm) pom lub teeb cheeb tsam. Qhov xiav-violet fluorescence no yog tov nrog lub teeb daj ntawm lub substrate (daj yog cov xim ntxiv ntawm xiav-violet) kom tau txais lub teeb dawb, uas muaj cov nyhuv whitening. Txij li thaum lub peev xwm ntawm lub substrate whitened los ntawm fluorescent whitening tus neeg saib xyuas kom pom lub teeb pom kev zoo, qhov dawb thiab ci ntsa iab ntawm lub substrate tau nce, ua rau cov pob zeb hauv av zoo li dawb, txaus siab rau lub qhov muag, thiab ci. Nws kuj tseem tuaj yeem pom tau tias kev ua kom dawb ntawm fluorescent whitening agents yog optical complementary xim brightening.
Txij li cov fluorescence ntawm fluorescent whitening agents yog tsim los ntawm ultraviolet lub teeb, ultraviolet lub teeb ntsiab lus ntawm irradiation lub teeb qhov chaw muaj kev cuam tshuam rau fluorescence siv thiab whitening nyhuv ntawm fluorescent whitening agent. Yog tias cov ntsiab lus ntawm lub teeb ultraviolet nyob rau hauv lub teeb irradiation yog siab, nws cov nyhuv whitening yuav raug cuam tshuam. Nws yog qhov tshwj xeeb pom tau; tab sis nyob rau hauv lub teeb qhov chaw uas tsis muaj los yog tsis muaj ultraviolet lub teeb ntsiab lus, cov nyhuv whitening yog heev me me los yog tsis muaj whitening nyhuv yuav pom ntawm tag nrho cov.
2. Kev sib piv ntawm kev ntxuav hniav dawb nrog fluorescent whitening agents thiab whitening nrog tshuaj bleaching
Tom qab cov khoom siv fiber ntau thiab tshuaj fiber ntau tau ua kom zoo dua qub, feem ntau ntawm cov khoom siv ntuj tsim los yog cov khoom siv dag zog tau raug tshem tawm, thiab cov xim dawb ntawm cov ntaub ntawv tuaj yeem ua tau raws li qhov yuav tsum tau ua, tab sis lawv tseem muaj xim daj me ntsis. Txhawm rau tshem tawm cov xim daj no thiab ua tau raws li qhov yuav tsum tau ua kom tawv nqaij ntau dua, peb txoj hauv qab no feem ntau yog siv: tshuaj bleaching, bluing thiab whitening, thiab fluorescent whitening agent whitening.
- Tshuaj bleaching
Tshuaj bleaching siv oxidants los yog txo cov neeg ua hauj lwm los rhuav tshem (tshem tawm) cov xim txoj kev loj hlob ntawm pigments ntawm textiles thiab lwm yam substrates kom ua tiav lub hom phiaj ntawm decolorizing thiab txhim kho whiteness, ua textiles thiab lwm yam substrates saib whiter. Vim yog oxidation lossis txo cov nyhuv oxidants lossis txo cov neeg ua haujlwm, ntxiv rau kev puas tsuaj ntawm cov xim, qhov sib txawv ntawm kev puas tsuaj rau textiles thiab lwm yam substrates kuj yuav tshwm sim, xws li txo qis zog.
- Sab saum toj xiav thiab dawb
Kev lig kev cai bluing siv xiav inorganic pigment los yog organic dye raws li ib tug bluing neeg sawv cev los kho textiles thiab lwm yam substrates. Nws absorbs daj lub teeb nyob rau hauv lub spectrum thiab qhia ntau xiav lub teeb. Lub teeb xiav ua rau peb lub qhov muag pom kev zoo nkauj. . Txawm li cas los xij, vim hais tias cov xim xiav xim los yog xim nws tus kheej kuj absorbs ib feem ntawm lub teeb pom kev, tag nrho cov teeb pom kev zoo yog me dua li ntawm cov xim tsis muaj xim xiav, yog li qhov ci ntawm whitened substrate ua me dua thiab zoo li npub lossis grey.
- Whitening nrog fluorescent whitening agents
Nws tuaj yeem pom los ntawm lub hauv paus ntsiab lus whitening ntawm fluorescent whitening agents tias qhov whitening ntawm fluorescent whitening agents yog optical complementary xim thiab brightening, yog li nws yuav tsis ua kev puas tsuaj rau lub whitened substrate. Tam sim no nws yog txoj kev siv tau zoo tshaj plaws thiab feem ntau siv los txhim kho cov xim dawb ntawm cov substrate.
Obviously, txoj kev saum toj no txawv ntawm ib leeg, tab sis lawv lub hom phiaj yog kom whiten me ntsis daj textiles thiab lwm yam substrates; lawv kuj muaj kev sib raug zoo. Kev ntxuav hniav dawb ntawm fluorescent whitening agents tsis tuaj yeem hloov tshuaj bleaching. Textiles uas muaj pigments Yog tias lwm cov substrates raug kho nrog cov tshuaj fluorescent whitening yam tsis muaj tshuaj bleaching, cov nyhuv whitening zoo tagnrho yuav tsis tau. Ib yam li ntawd, kev kho bluing ncaj qha rau ntawm cov substrates xws li textiles uas tsis tau bleached yuav tsis ua tiav cov nyhuv whitening.
