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Modscour BL
 

Modscour BL

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Low foam wetting and scouring agent for high turbulence machines.

Low foam wetting and scouring agent for high turbulence machines.

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    Modscour BL Modscour BL Presentation Transcript

    • Technical PresentationMCPL 15/11/98ECONOMICALLY & ECOLOGICALLY IMPROVED PEROXIDE BLEACHMODHERA CHEMICALS PVT. LTD., offers “MODSCOUR-BL” as a product which is well tried and tested in hydrogenperoxide bleaching. The most distinguished properties of this product lie in that it enables various functions to beperformed in one bath and also allow the fundamental needs of the consumers for more environmental compatibility. It isbio-degradable to high degree. Besides preventing redeposition of impurities the product offers good stability against acids(important for acid extraction) and alkalies, excellent wetting and re-wetting properties, inhibition of iron and stabilisingaction for peroxide.MODSCOUR-BL is suited for all types of machinery (continues and discontinuous) and guarantees minimal fibre damage,while achieving a high degree of whiteness at the same time. The user will benefit in quality from the universal means ofapplying this hitech MCPL product, and will also have savings in time, water and energy.Advantages: Only one product now needed for peroxide bleaching Optimum degree of whiteness Reduced use of chemicals possible Excellent d.p. values Very good re-wetability Suitable for all types of machines and processes Stable to acids, alkali, electrolytes and temperatures upto 135ºC Energy saving due to shortened processes Complete dispensation of silicate BiodegradableScope of Applications: Bleach bath stabilisation Demineralisation bleaching by one bath / two step process “Three in one” product - Wetting / scouring - Dispersing - Stabilisation
    • Profile of MODSCOUR-BL Good BiodegradibilitySequestration of Ca, Mg at Stable to alkali, acids,the presence of high amount electrolytes.of alkaliSequestration of iron & Stable to temperatures uptoother heavy metal ions in 135ºChot strongly alkaline liquors MODSCOUR-BLDispersing power of Ca, Support of surface activeMg & heavy metal componet during extractionhydroxides processes.Acid extraction & peroxide Easily dosablebleaching in one bath Stabilisation by complete dispensation of silicate
    • MODSCOUR-BL : Manganese, Iron, Copper binding capacity at 98ºC. 400 mg metal ions / g 300 product pH 7 200 pH 9 pH 11 100 0 manganese iron copper Metal Ions Stabilisation with MODSCOUR-BL in relation to magnesium content 100 90 80 70Residual H2O2, (%) 60 Mod scour- BL 50 Perostab -BLN Silicate 40 30 20 10 0 Additio n o f M agn esium C hlo rid e [ºd H]
    • Dependance of Stabilisation on the Magnesium content of the Bath 90 80 Residual Peroxide Final Stabilisation 70 60 in % 50 40 30 20 Modscour- BL 10 0 Waterglass 2ºdH 4ºdH 8ºdH 12ºdH 16ºdH 20ºdH 32ºdH 48ºdH 64ºdH 80ºdH Addition of Magnesium Chloride [ºdH] BLEACHING OF TOWELLINGMachine : Thies Roto StreamMaterial : 100% cottonLiquor ratio : 1 : 10
    • Bleaching recipe:1~1.5 g/l : MODSCOUR-BL2 g/l : NaOH Flakes5~5.5 m/l : H2O2 50%Water hardness : 8º Gh = 10ºEh(If only deionized water is available add 0.3 g/l MgCl2 . 6H2O) 95°C 60 min. 95°C 2.5°C/min. 80°C 25°C Drain Pretreatment of Dyeing - CheeseProduction Steps1. Demineralization / Bleaching (Semi White)2. Vat Dyeing3. Reactive dyeingProblematicRepeatly unlevelness on light Vat and Reactive shades occurred in the past in so far as the package inside was lighter thanoutside. Analyses of the yarn led to the result that deposits of mineral hydroxides caused a blockage of the liquor flow.The followimg Pre-treatment process solved the problem.
    • 1. Pre-Bleach Process Machine : Open Thied package bleaching unit, circulation in one Direction, Inside Outside Material : 300 kgs. cotton cheese, Nm 19/1. Liquor ratio : 1 : 101.1 First Step Deminerlization 2 g/l : MODSCOUR-BL 5 g/l : ALTRANOL-OL / MODFOR-R-610 1 ml/l acetic acid 60% : pH 4~6 20 min, at 40°C1.2 Second Step (same bath) Bleaching 1.2 ml.l NaOH 50% 2 ml/l H2O2 35% 40 min. 95°C 95°C 40°C Drain - Overflow Rise at 70°C, 15 min. - Rise at 70°C, 8 min. Addition of 1 g/l MODSCOUR-BL pH after Rinsing 72. Vat Dyeing (on different machine, closed apparatus with alternating circulation)
    • 2.1 Pigmentation 1 g/l MODQUEST-FSN 1 g/l MODLEVELLER-VL 0.25% Pigment (Fine dispersion) 0.061% Pigment (Colloidal) 5 m/l NaOH -10 min. at 80°C2.2 Vatting 3~3.5 g/l Sodium hydrosulphite - 20 min. at 80°C - 30 min. at 60°C2.3 Rinsing and Oxidation2.4 Soaping 1~1.5 g/l MODLEVELLER-VL 1~1.5 g/l MODQUEST-WS - 15 min. at 96°C2.5 Acidification 0.5 ml/l Acetic acid 60% - 10 min. at 40°C2.6 Rinsing at 40°C, and cold2.7 Softening2.8 Pressure drying3. Reactive Dyeing3.1 Pre-Bleach, same as for Vats3.2 Dye Process
    • % shade required Reactive dye 1~1.5 g/l MODQUEST-FSN 50 g/l Glauber’s salt 20 g/l Soda ash 50°C 30 min. 50°C 60 min. 50°C25°C 25°C Soda ash DrainMODQUEST-FSNDyestuffSalt3.2 Rinsing - 5 min. at 25°C - 5 min. at 25°C - 5 min. at 25°C, addition of 0.4 ml/l Acetic acid 60%3.4 Washing-off - 10 min. at 98°C addition of 1~2 g/l MODQUEST-FSN3.5 Rinsing - 5 min. at 40°C3.6 After treatment 0.5 ml/l Acetic acid 60% 2% ECOFIX-2F - 10 min. at 40°C3.7 Pressure drying Bleaching of viscose with MODSCOUR-BL on MCS continuous machine
    • Method : Desizing (Enzymatic) Hydrozen Peroxide treatmentMachine : MCS continuous machine - About 1000 running meters in the machine - Speed : 35 m/min. - Liquor ratio : 1:4 - Fabric: Viscose/Cosa about 10.000 running metersRecipe : Desizing : - MODSCOUR-BL : 0.2~0.5 g/l - Enzyme : As per recommendation - pH : As per recommendation - Retention time : 12 hBLEACHING: Starting recipe - MODSCOUR-BL 1 g/l - NaOH 50% 1 g/l - H2O2 50% 4 g/l If only soft water is available add 0.6 g/l MgCl2, otherwise add only 0.2 g/l MgCl2. Feed liquor conc. - Machinery : see sketch next pageA) 12 g/l Enzymes } 4 g/l MODSCOUR-BL } pH=6 } 500 ltr.B) 20 g/lNaOH 50% } Stock solutions 3 g/l MODSCOUR-BL } ⇓ Dosage: 80 ltr./hr.C) 40 g/lH2O2 50% } 4 g/l MODSCOUR-BL } 3 g/l MgCl2 }
    • Classical Procedure Indicative formulation with MODSCOUR-BL4 g/l Washing agent 10 – 12 g/l MODSCOUR-BL1 g/l Phosphonate 0.2 g/l Magnesium Chloride6 g/l Wetting agent 15 g/l NaOH 100%6 g/l Stabiliser 50 g/l H2O2 35%25 g/l NaOH 50%40 g/lH2O2 50%---------------------------------------------- Retention 18 – 24 h -------------------------------------------Squeezing effect 75% Squeezing effect 75% Impregnation Retention Washing COLD PAD-BATCH
    • LABORATORY TESTS Degree of whiteness Degree of polymeri- Rewettability Whiteness (Berger) zation (repeated determinations)Grey fabric 63.9 329 20 sec.MCPL Bleaching 70.8 227 Spontaneous PRE-TREATMENT COMBINED ALKALI TREATMENT + OXIDATIVE DESIZING AND BLEACHINGMachinery (see sketch next page)1. Grey fabric (A-frame)2. Singeing3. Alkali treatment + oxidative deszing Padding liquor: Caustic soda 35 g/l Na-persulphate 5 g/l Altranol-CD/Modscour-LF 2 g/l Temperature 90-95°C Pick-up 80%4. Dwelling 4 hours5. Washing-off, 4 comparments at90°C – counter current, 1 compartment cold rinse6. Impregnation compartment Starting concentration: Hydrogenperoxide 50% 40 ml/l Caustic soda flakes 28 g/l MODSCOUR-BL 10 g/l Magnesium chloride.6H2O 0.2 g/l7. U-Box Reaction Unit Temp. of steam 101°C Steaming time 20 min8. Washing-off compartments, Temp. 80-90°C9. Drying cylinders
    • CONTINUOUS PRE-TREATMENT, 2 STEP PROCESS a) Alkali treatment + Oxidative desizing b) Bleaching ------>1 2 3 4 5 6 7 8 9
    • Information about the process run1. Material Cotton weave, 440 g per running meter Warp, sized with a blend of Corn starch Polyvinyl alcohol Polyacrylate Wax2. Previous process 1st Step: Enzymatic desizing, dwelling process 2nd Step: a) Washing-off decomposed starch b) Alkali-Pad Steam 3rd Step: Peroxide-Pad steam3. Process 1st Step: Combined alkali + oxidative treatment, dwelling process 2nd Step: a) Washing-off solubilized impurities and decomposed starch b) Peroxide-Pad steam3.1 Advantages of the oxidative desizing in the alkali step - Maximum swelling of cellulose, breaking up of husks, saponification of waxes and grease. - Persulphate decomposes starch as well as polyvinyl alcohol - Alkali solubilizes polyacrylate - Shorter dwell time (4 hours) as compared to enzymatic desizing Remarks : Padding at 90ºC, covering of batching roller with foil Temperature is kept due to exothermic reactions: Starch + Persulphate exothermic > Polyvinylalcohol + Persulphate exothermic >3.2 Calculation of feed liquor concentration F1 = 60% (Entry mangle) F2 = 90% (Exit mangle) 2 d = 30% 90 = 90 = factor 3 F2 – F1 90-60
    • 4. Results Degree of Damage factor Degree of Whiteness Polymerization by Eisenhut Elrepho FilterGrey fabric 1820 48.9%Treated fabric (withoutMercerization) 1550 0.29 70%No optical brightening5. Evaluation and actions The reduction of polymerization degree of 15% and a damage factor of 0.29 are satisfactory results. Bearing in mind that the former practised enzymatic desizing resulted in an incomplete removal of the size the oxidative method is a good alternative. Pad-steam (U-box) continuous oxidative desizing and bleaching Process-stepsA: 3 Compartments prescouring 90-95ºC Recipe 1 Addition into compartment No. 3, with overflow in compartment No. 2 and No.1 0.5 ~ 1g/l ALTRANOL-CD/MODSCOUR-LF 1 g/l MODQUEST-FSN Wash-off, overflow compartment No. 4B: Combined akali treatment and oxidative desizing Recipe 2 Starting concentration: 4 g/l Na-persulfate 0.5~1 g/l ALTRANOL-CD / MODSCOUR-LF 25 g/l NaOH flakes Concentration of feed liquor: 4 times
    • C: Steaming 2 times 15 min/102ºC U-Box-SteamerD: Recipe 3 3 Compartments at 80-95ºC overflow rinse 1 Compartment cold overflow rinseE: Peroxide bleaching Recipe 4 Starting concentration 8 g/l MODSCOUR-BL 20 g/l NaOH flakes 40 g/l H2O2 50% 0.3 g/l MgCl2.6H2O (necessary if water hardness is below 8ºGh or 10ºEh) Concentration of feed liquor : 4 timesF: Steaming 15 min/102ºC U-Box-steamerG: Recipe 5 4 Compartments hot rinse overflow (counter current if possible)H: Cylinder-dryer
    • Fabric x y Na2S2O8 NaOHSingeing extinguish 4 x wash-off impregnation bath U-Box-Steamer 50-60 sec. total 4 times conc. of 2 times 15 min/102ºC feed liquor Modscour-BLfabric z { H2O2 fabric NaOH Impregnation bath, 4 x wash-off 4 times conc. of U-Box-Steamer 50-60 sec. total feed liquor 15 min/102ºCfabric | 4 x wash-off 50-60 sec. total cylinder dryer See recipe 1-5 Continuous-pretreatment- plant
    • BLEACHING BY PAD-STEAM METHODMETHOD : H Singeing H Desizing (Enzymatic) H Hydrogen Peroxide treatment(Pad steam)MACHINE : KÜSTERS Combi-Steamer (with Flexnip “System)STEAM TEMPERATURE : 102ºCSTEAMING TIME : 25 min.SPEED : 100 m/min.MATERIAL : 100% Cotton (household linen 120 g/m2)RECIPE :H DESIZING : Enzyme As per recommendation Allendet-NI/Altranol-OL 2 g/l pH As per recommendation Retention time As per recommendationH WASHING : 90ºC, 95ºC, 95 (3 Compartments)H BLEACHING : - Pick-up 100% - Water hardness 15º (french hardness) (=8º German hardness) That means magnesium chloride is not necessary. - Steaming time 25 min. at 102ºCRecipes COMPETITORSH 30 ml/l NaOH 36 BèH 70 ml/l H2O2 35% (= 46 ml/l H2O2 50%)H 8 g/l StabilizerH 6 g/l Wetting agentH 4 g/l Sequestering agentH 1 g/l Defoamer
    • MODHERA CHEMICALS PVT. LTD.H 50 m//l NaOH 36BèH 50 ml/l H2O2 35%H 10 g/l MODSCOUR-BLH WASHING 95ºC, 90ºC, 60ºC, 50ºC (4 Compartments) RESULTS DP S Degree of Water (STN whiteness absorbency 2.075/84)Grey Fabric 1883 35 /Competitor 1879 0 71.1 SpontaneousMCPL recipe 1917 0 71.2 SpontaneousS= Damage factor
    • Bleaching by pad steam methodMethod : Desizing (enzymatic) – Pad roll, combined alkali / Hydrogen peroxide treatment – Pad steamMachine : Babcock combi steamerSteam temp. : 100ºCSteaming time : 15 minutesSpeed : 50 m/min.Material : 100% cotton, plain weave, 216 g/mRecipe (starting concentration) H2O2 50% 40.0 ml/l NaOH 50% 16.0 ml/l (24.5 g/l) MODSCOUR-BL 10.0 g/l Water : 8º German hardness=10º English hardness. If only deionized water is available add 0.3 g/l MgCl2.6H2O.Calculation of feed liquor concentration F1 = 65% (Entry machine) F2 = 95% (Exit mangle) d2 = 30% 95 95 95-65 = 95-65 = 3.2 factorResult- Desizing = very good (assessment by TEGEWA Violet = standard: note 9)- Water absorbency = Penetration 3 sec. Spreading: Warp 35 mm Weft 31 mm- Whiteness = good- Seed removal = complete- DP decrease = 6%- Damage factor = very good, undamaged (Damage factor Eisenhut: 0.04)
    • Degree of polymerisation:In continental Europe fluidity is not normally used as an expression of chemical damage but a measure of the degree ofpolymerization (DP). It is obtained from the viscosity using a modified Staudinger equation. The development of theseequations and their use is given by O. Deschler (textile-Praxis 1958, 13, p 927)Typical values for DP are:----------------------------------------------------------------------------------------------------------Fibre DP----------------------------------------------------------------------------------------------------------Natural fibres; cotton, flax, ramine 2300-3000Acceptably bleached cotton 1800-2000Regenerated cellulose polynosic 1000-1200Viscose 250- 400The relationship between DP and fluidity (F) for cotton is given by the equation: DP = 2032 [log10 74.35 + F ] - 573 FAnd this is shown graphically on pageDamage factor:The damage factor (S), suggested by O. Eisenhut (Melliand Textilber. 1941,22, p 424) relates damage to the change in DPand so takes into account high initial DPs. S=log10 (2000 _ 2000 + 1) log102 Ptx PtxPt = DP before chemical treatment Ptx = DP after chemical treatment 2000 = reference valueThe damage factor has been categorized to indicate the degree of damage.----------------------------------------------------------------------------------------------------------8 factor comment----------------------------------------------------------------------------------------------------------0.01 – 0.2 very good – undamaged0.21 – 0.3 good – very carefully bleached0.31 – 0.5 satisfactory0.5 – 0.75 slightly damaged0.75 badly damaged----------------------------------------------------------------------------------------------------------
    • PEROXIDE BLEACHING - DISCONTINUOUS Package Yarn (Hanks) Jigger Jet Winch Liquor ratio 1:8 - 1:10 1:15 1:3 – 1:6 1:8 - 1:10 1:20 Temperature 98 98 98 98 Duration (min) 30-45 60 60 30-45 30-45 Magnesium chloride (g/l) ⇒ water 0.2-0.3 0.2-0.3 0.2-0.3 0.2-0.3 0.2-0.3 hardness 8-12° dH MODSCOUR-BL (g/l) 0.8-1.5 0.8-1.2 3-5 1.2-1.5 0.4-0.8 ALTRANOL-CD 0.5 ---- ---- ---- ---- Caustic soda flakes (g/l) 1.5-3 1.5-2 4-5 1.5-3 1-1.5 Hydrogen peroxide 35 weight-% (ml/l) 4-8 4-6 10-15 6-8 2-4 PEROXIDE BLEACHING : COLD PAD-BATCH Pick-up 100% Dwell time (h) 16-24 Magnesium chloride (g/l)⇒ water hardness 8-12° dh 0.2-0.3 MODSCOUR-BL (g/l) 4-6 Caustic soda flakes (g/l) 15-20 Hydrogen peroxide 35 weight-% (ml/l) 40-60 PEROXIDE BLEACHING : PAD STEAM Combination U-Box Pad-Roll Steam temperature (°C) 100 97-99 85-90 Dwell time (min.) 7-20 20-50 60-120 Magnesium chloride (g/l)⇒ water 0.2-0.3 0.2-0.3 0.2-0.3 hardness 8-12° dH MODSCOUR-BL (g/l) 4-8 8-10 8-10 Caustic soda flakes (g/l) 20 20 20 Hydrogen peroxide 35 weight-% (ml/l) 60-40 40 40Pick-up : 100% The above technical presentation proves MODSCOUR-BL as ECONOMICALLY & ECOLOGICALLY improved peroxide bleach