Sulfur Black rau Paj Rwb Dyeing: Ib Daim Ntawv Qhia Tag Nrho

Sulfur dub tseem yog ib qho tseem ceeb tshaj plaws thiab tus nqi - cov xim zoo rau kev ua tiav cov xim dub sib sib zog nqus ntawm cov paj rwb ntshiab, xws li denim, canvas, corduroy, thiab yarns. Nws qhov sib txawv ntawm qhov ntxoov ntxoo tsis sib xws, nrawm nrawm rau lub hnub ci, thiab tus nqi qis tau ruaj ntseg nws txoj haujlwm hauv kev lag luam rau ntau xyoo, txawm tias qee yam zoo - paub txog kev sib tw.

Cov txheej txheem dyeing nrog sulfur dub yog ntau-theem thiab yuav tsum tau ceev faj tswj. Txij li cov dye nws tus kheej yog insoluble nyob rau hauv dej, nws yuav tsum xub muab tshuaj txo. Qhov no feem ntau yog ua los ntawm kev txo tus neeg sawv cev xws li sodium sulfide (sulfur alkali) nyob rau hauv kub, alkaline tej yam kev mob. Qhov kev txo qis no hloov cov xim rau hauv nws daim ntawv "leuco" soluble, uas yog xim daj -ntsuab tshuaj npaj rau daim ntawv thov.

Cov paj rwb ntaub yog immersed nyob rau hauv no npaj dye da dej. Txhawm rau kom muaj kev nqus zoo thiab qib dyeing, electrolytes xws li ntsev lossis Glauber's ntsev ntxiv. Thaum lub sij hawm no, daim ntawv soluble leuco nkag mus rau hauv cov paj rwb fibers. Txawm li cas los xij, cov xim ntawm lub sijhawm no tsis yog qhov kawg dub tab sis ib qho ntxoov ntxoo ntsuab ntsuab. Qhov tseeb xim tsim nyob rau hauv qhov tseem ceeb oxidation kauj ruam. Tom qab dyeing, cov ntaub yog raug rau huab cua los yog kho nrog oxidizing tus neeg sawv cev zoo li hydrogen peroxide. Cov kauj ruam no reconverts lub soluble leuco compound nyob rau hauv lub fibers rov qab mus rau hauv lub qub, insoluble sulfur dub pigment, mus tas li xauv cov xim nyob rau hauv.

Tej zaum qhov tseem ceeb tshaj plaws yog tom qab - kho. Sulfur dub yog qhov tsis zoo rau kev ua "kev sib tw," qhov tshwm sim uas cov ntaub khaws cia tuaj yeem ua tsis muaj zog thiab txhim kho qhov vim qhov tsim ntawm sulfuric acid los ntawm cov tshuaj seem. Txhawm rau tiv thaiv qhov no, kev kho kom zoo tom qab - yuav tsum tau kho. Qhov no suav nrog kev yaug nruj, alkaline ntxuav kom tsis txhob muaj cov kua qaub, thiab feem ntau yog kev kho zaum kawg nrog cov tshuaj tiv thaiv tshwj xeeb los yog urea.

Thaum piv rau lwm cov xim dub zoo li cov xim dub reactive, sulfur dub tuav qhov zoo thiab qhov tsis zoo. Nws lub zog tseem ceeb yog nws lub dav hlau zoo tshaj -dub tsos, zoo li lightfastness, thiab tus nqi qis heev. Ntawm qhov downside, cov txheej txheem tsim cov dej khib nyiab uas muaj cov tshuaj sulfur, uas ua rau muaj kev nyuaj rau ib puag ncig. Cov ntaub dyed nrog leej faj dub kuj tuaj yeem muaj qhov hnyav dua txhais tes thiab, yog tias tsis ua tiav, ua rau muaj kev pheej hmoo ntawm kev sib tw cia. Nyob rau hauv sib piv, reactive dyes, thaum kim kim thiab tej zaum tsis sib sib zog nqus suab, muab ib tug softer tes, ib tug yooj yim daim ntawv thov txheej txheem, thiab yog ib tug ntau tus phooj ywg nyob rau hauv cov nqe lus ntawm effluent.

Hauv cov ntsiab lus, sulfur dub yog cov xim ntawm kev xaiv rau kev lag luam, sib sib zog nqus dub paj rwb dyeing qhov siab lightfastness yog qhov tseem ceeb. Nws daim ntawv thov kev vam meej vam khom ntawm cov txheej txheem zoo-tshwj xeeb yog qhov tseem ceeb ntawm oxidation thiab tiv thaiv- kev sib tw tom qab- kho- kom sib npaug nws qhov kev ua tau zoo tshwj xeeb nrog nws qhov tsis zoo.