Vim li cas dyes fade nyob rau hauv lub hnub?

Thaum lub dye molecule absorbs lub zog ntawm ib tug photon, nws yuav ua rau sab nraud valence electrons ntawm lub molecule hloov los ntawm lub hauv av xeev mus rau lub xeev siab.

Cov tshuaj tiv thaiv photochemical tshwm sim ntawm qhov zoo siab dye molecules thiab lwm yam molecules, uas ua rau photofading ntawm dye thiab photobrittleness ntawm fiber.

2.Qhov cuam tshuam rau lub teeb nrawm ntawm dyes

1).Lub teeb qhov chaw thiab wavelength ntawm irradiating lub teeb;
2).Environmental yam;
3).Cov khoom siv tshuaj lom neeg thiab cov qauv tsim ntawm fibers;
4).Lub zog sib txuas ntawm cov xim thiab fiber ntau;
5).Cov qauv tshuaj dye;
6).Dye concentration thiab aggregation xeev;
7).Kev cuam tshuam ntawm cov hws dag rau dye photofading;
8).Kev cuam tshuam ntawm additives.

3.Txoj kev los txhim kho lub hnub ci ceev ntawm dyes

1).Txhim kho cov qauv ntawm cov xim kom nws tuaj yeem siv lub teeb lub zog thaum txo qhov cuam tshuam ntawm cov xim xim, yog li tswj cov xim qub;uas yog, dyes nrog lub teeb ceev ceev yog feem ntau hais.Tus nqi ntawm cov dyes feem ntau yog siab dua li cov dyes zoo tib yam.Rau cov ntaub uas muaj lub hnub ci siab, koj yuav tsum xub pib nrog kev xaiv xim.

2).Yog tias cov ntaub tau dyed thiab lub teeb nrawm tsis ua raws li qhov yuav tsum tau ua, nws tuaj yeem txhim kho los ntawm kev siv cov khoom siv ntxiv.Ntxiv cov additives tsim nyog thaum lub sij hawm dyeing txheej txheem los yog tom qab dyeing, thiaj li hais tias thaum raug rau lub teeb, nws yuav hnov ​​​​mob nrog lub teeb ua ntej dyeing thiab haus lub teeb lub zog, yog li tiv thaiv cov xim molecules.Feem ntau muab faib ua ultraviolet absorbers thiab anti-ultraviolet agents, collectively hu ua lub hnub fastness enhancers.

Lub hnub ci ceev ntawm lub teeb-xim ntaub dyed nrog reactive dyes

Lub teeb fading ntawm reactive dyes yog ib tug complex photooxychlorination cov tshuaj tiv thaiv.Tom qab nkag siab txog cov txheej txheem photofading, peb tuaj yeem paub meej tsim qee qhov teeb meem rau cov tshuaj tiv thaiv photooxidation thaum tsim cov qauv molecular ntawm cov xim kom ncua lub teeb fading.Piv txwv li, cov xim daj uas muaj dolsulfonic acid pawg thiab pyrazolones, xiav dyes uas muaj methyl phthalocyanine thiab disazo trichelate rings, thiab xim liab uas muaj hlau complexes, tab sis lawv tseem tsis muaj ci liab hnub ci tsis kam.Reactive dyes rau lub teeb ceev ceev.

Lub teeb nrawm ntawm dyed khoom sib txawv nrog kev hloov ntawm dyeing concentration.Rau cov ntaub dyed nrog tib dye rau tib fiber ntau, lub teeb ceev ceev nce nrog qhov nce ntawm dyeing concentration.Lub dyeing concentration ntawm lub teeb-xim ntaub yog tsawg thiab lub teeb ceev ceev yog tsawg.degree poob raws li.Txawm li cas los xij, lub teeb nrawm ntawm cov xim zoo nkauj ntawm daim npav xim xim yog ntsuas thaum lub dyeing concentration yog 1/1 ntawm tus qauv qhov tob (xws li 1% owf lossis 20-30g / l dye concentration).Yog tias qhov dyeing concentration yog 1/6. Nyob rau hauv cov ntaub ntawv ntawm 1/12 los yog 1/25, lub teeb ceev ceev yuav poob qis heev.

Qee cov neeg tau thov kom siv ultraviolet absorbers los txhim kho lub hnub ci ceev.Qhov no yog ib txoj kev uas tsis xav tau.Feem ntau siv cov kab hluav taws xob ultraviolet, thiab nws tsuas tuaj yeem txhim kho los ntawm ib nrab kauj ruam, thiab tus nqi ntau dua.Yog li ntawd, tsuas yog ib qho kev xaiv tsim nyog ntawm dyes tuaj yeem daws qhov teeb meem ntawm lub teeb nrawm.