Lab Experiment 08 BLEACHING

8/19/2019 Lab Experiment 08 BLEACHING

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Lab Experiment 08

BLEACHING

Name: Student Idi:

Score: Signature of Lab tutor: Dare:

BLEACHING ! "00#C$$N !AB%IC B& CN$IN''S (E$HD

)E%!%(ANCE B*EC$I+ES

'pon t,e -ucce--fu. comp.etion of t,i- experiment -tudent- /i.. be ab.e to:

i1 'nder-tand t,e b.eac,ing proce--ii1 'nder-tand ro.e of auxi.iarie- u-ed in t,i- proce--

iii1 'nder-tand t,e continuou- b.eac,ing proce--

(ACHINES2(A$E%IAL %E3'I%ED

• Scoured fabric

• )ad4-team mac,ine

CHE(ICAL %E3'I%ED

• H5drogen per xide

• Cau-tic Soda

• Stabi.i6er

• 7etting Agent• Seue-tering Agent

DISC'SSIN

During t,e -couring of cotton impuritie- .i9e fat- /ax protein- pectin- and a-, i-

remo;ed< Ho/e;er -couring doe- not remo;e natura. co.or of cotton< It a.-o doe-

not comp.ete.5 remo;e -eed and ,u-9< $o remo;e natura. co.or of t,e cotton and

-eed fragment b.eac,ing proce-- fo..o/- t,e -couring< Sometime- bot, -couring

and b.eac,ing are -imu.taneou-.5 carried out= t,e proce-- i- ca..ed -o.amatic

b.eac,ing<

Cotton contain natura. pigment- ca..ed c,.orop,5..- and xant,op,5..- /,ic,

cau-e it- co.or to be 5e..o/i-,< In t,e proce-- of b.eac,ing t,e-e pigment- are

remo;ed from t,e cotton >ber< A.ong /it, t,e-e pigment- -eed fragment- are

a.-o remo;ed< $,u- b.eac,ing accomp.i-,e- puri>cation of t,e >ber<

"< H5drogen per xide H?0?1:



H5drogen per xide i- comparati;e.5 expen-i;e b.eac,ing agent< But

beacau-e of ea-e of app.ication .ea-t t,reat for t,e -ub-trate and

en;ironment friend.5 nature it i- /ide.5 u-ed for t,e remo;a. of natura.

pigment-<?< Sodium ,5po4c,.orite NaC.1:

If t,e pH i- not contro..ed during NaC. b.eac,ing it /i.. degrade

ce..u.o-e= becau-e of t,e formation of t,e ,5po4c,.orou- acid at neutra.

pH @1 and .iberation of c,.orine ga- at pH .o/er t,an @< Ho/e;er under

contro..ed condition it ma5 be -uitab.e option<

< Sodium c,.orite NaC.?1:

Sodium c,.orite /,en u-ed a- b.eac,ing agent produce- c,.orine dioxide

e;ent at contro..ed proce--1 /,ic, i- extreme.5 toxic< At t,e -ame time

it i- extreme.5 corro-i;e to t,e mac,iner5 becau-e of t,i- it i- .ea-t

preferred b.eac,ing agent<

Depending on t,e extent of b.eac,ing fabric ma5 be -aid to be ,a.f b.eac,ed or

fu.. b.eac,ed< In t,e ,a.f b.eac,ed fabric -ome of t,e natura. pigment- are

remo;ed and fabric 5et contain- c,.orop,5.. and xant,op,..-< Ho/e;er in ca-e of

fu.. b.eac,ed fabric a.mo-t a.. natura. pigment- are remo;ed< $,e remo;a. of t,e

natura. co.or of t,e cotton it- /,itene-- i- increa-ed< A norma. b.eac,ed fabric

ma5 ac,ie;e /,itene-- index of about 0 to @ or -ometime- 80<

$5pica. %ecipe

C,emica. 3uantit5

Liuor %atio

H5drogen per xide #1

Cau-tic -oda -o.id1

Sandoc.ean )C4L! pa-te1



Stabi.i6er SI!A .iuid1

(gC.?

)%CED'%E

"< )repare t,e bat, according to recipe<?< )ad t,e fabric at 80# pic9 up<< Steam -aturated1 t,e fabric for ?040 min: at "0?C<< Hot rin-e at 80C4F0C for "0 min:< 7arm rin-e at 0C for "0 min: and >na..5 co.d rin-e for minute-<

Ca.cu.ation-

S<N

(ateria. 3uantit5

" !abric 7eig,t

? $ota. Liuor

H5drogen per xide

Cau-tic Soda

Stabi.i6er

(gC.?

@ Sandoc.ean )C4L!

pa-te1



$ES$ %E'L$S

%E+IE7 3'ES$INS

"< 7,at i- ro.e of (gC.? in H?? b.eac,ing

?< 7,at are t,e ad;antage- of continuou- b.eac,ing o;er ex,au-t b.eac,ing

proce--

< 7,at are rea-on- of foaming and ,o/ it can be a;oided

!INAL CHEC LES$

"< C.ean 5our mac,iner5 euipment2 materia. and /or9benc, before 5ou

.ea;e<?< En-ure t,e rep.acement of a.. euipment- to t,eir -peci>ed -torage area<< Submit 5our an-/er to ue-tion- toget,er /it, 5our data ca.cu.ation and

re-u.t- before t,e next .aborator52 euipment<



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Lab Experiment 08 BLEACHING