CN102747622B - Stripping agent of indigo dyed pure cotton jean and stripping method thereof - Google Patents
Stripping agent of indigo dyed pure cotton jean and stripping method thereof Download PDFInfo
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Abstract
The invention discloses a stripping agent of indigo dyed pure cotton jean and a stripping method of the stripping agent, belonging to the technical field of jean stripping, wherein the stripping agent comprises following components by weight: 5-10% of a penetrating agent, 20-25% of a dispersant and the balance of water; the penetrating agent is an anionic surfactant; and the dispersant is any one of polyethylene glycol, polyether nonionic surfactant, polyvinylpyrrolidone, polyvinyl alcohol and polyacrylic acid. The stripping agent and the stripping method disclosed by the invention have good stripping effect and excellent environment protection performance, and are suitable for large-scale promotion in industrial application.
Description
Technical field:
The present invention relates to the denim technical field of stripping, more specifically, relate to a kind of indigo dyeing jean cloth stripping agent and stripping method.
Background technology:
China is quite huge to the consumption of the natural fabrics such as cotton, hair, silk, fiber crops every year.All kinds of textile fiber materials such as the cotton that according to statistics, China's textile industry consumes every year, fiber crops, chemical fibre reach 4,500 ten thousand tons; Meanwhile, according to expert calculation, the weaving leftover pieces that produce at production link every year and the textiles of household waste add up to over 2,200 ten thousand tons.Comprehensive utilization to waste textile, not only can save the area, reduce environmental pollution, can also supplement the raw material supplying of China's textile industry.
Along with growing with each passing day of output and consumption figure, a large amount of waste textiles is " geometric " and increases, and waste textile is recycled the intractability that is not only conducive to alleviate discarded object, can also save the energy and reduce carbon dioxide and other gas purgings.
Tradition denim fabric refers to cotton yarn indigo dyeing makes warp thread, and gray yarn is made weft yarn, adopts the bottom right thick drillipg that tiltedly tissue is interwoven on three.Jeans, from producing 100 years till now, develop into the leisure wear of general public from blue-collar worker's Work Clothes.Each corner that jean also goes to the world along with the fashionable whole world of jeans.Along with the trend of globalization of China's accession to the WTO and jeans, China's denim production development is rapid, has become the most potential market, the world, and the jean cloth main force of Dou Shi denim family all the time.
Denim leftover pieces reclaim has larger commercial value and environment protection significance, and it is the important step that denim leftover pieces are recycled that denim is stripped.At present, people strip and conventionally adopt oxidizing process denim, utilization is carried out Oxidative demage to indigo molecule and decolours as clorox, potassium permanganate etc. compared with strong oxidant, bring thus the liquid of stripping high containing dirty rate, there is this problem of serious environmental pollution in discharging of waste liquid, simultaneously serious to the performance damage of cotton fiber, to further utilizing fiber development subsequent product tool to have a certain impact.
Adopt separately sodium hydrosulfite and, caustic soda strips to indigo reduction, reduzate on fiber is difficult for removing, because indigo molecule color development system is destroyed by the reduction of sodium hydrosulfite, be reversible, reduzate can revert to again indigo true qualities and cause the poor effect of stripping under air oxidation.
The present invention is directed to above-mentioned situation, through system research, prepared stripping agent a kind of and sodium hydrosulfite, caustic soda coupling, simultaneously by the optimization technique of stripping, obtain the effect of stripping preferably, indigo can recovery after sedimentation and filtration, reduced first waste water containing dirty rate, the liquid of second stripping after indigo removal can reuse again, thereby reduced discharging of waste liquid, can yet be regarded as is a kind of technology of stripping of green.
Summary of the invention:
A first aspect of the present invention object is to provide a kind of indigo dyeing jean cloth stripping agent, it is characterized in that, comprise by weight percentage following composition: bleeding agent 5-10%, dispersant 20-25%, surplus is water.
Described bleeding agent is anion surfactant, is preferably any one of alkylbenzenesulfonate, aliphatic hydrocarbon and alkene sulfonate, fatty alcohol and fatty alcohol ether sulphate, fatty alcohol and aliphatic alcohol polyoxyvinethene phosphate.Its structural formula is as follows:
In said structure formula: R is aliphatic saturated hydrocarbon, unsaturated aliphatic hydrocarbon or aromatic hydrocarbon; M is metal ion, as K+, Na+ etc.
Described dispersant is selected from any one of polyethylene glycol, polyether nonionic surfactant, polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic.Its structural formula is as follows:
In said structure formula: n, a, b, c is respectively positive integer.
A second aspect of the present invention object is to provide a kind of stripping method of indigo dyeing jean cloth, it is characterized in that, comprises the following steps:
According to the weight of fabric, according to bath raio 1:20-30, add volume required water, be warming up to 85-95 ℃, drop into successively caustic soda 2-3g/L, stripping agent 4-5 g/L, paregal O 3-5 g/L, sodium hydrosulfite 4-5g/L, stir and make medicament dissolution, then drop into fabric, stir, circulation or ultrasonic vibration, insulation 40-50min, draining, with clear water washing 2-3 time.
Further arrange as follows: sodium hydrosulfite 4 g/L, caustic soda 2 g/L, paregal O is 5g/L, stripping agent 4.5g/L, bath raio is 1:30, temperature is 90 ℃, time 40min.Under above-mentioned technology preparation, can obtain the best indigo dyeing jean cloth effect of stripping.
The operation principle that the present invention adopts is as follows:
Tradition denim fabric refers to cotton yarn indigo dyeing makes warp thread, and gray yarn is made weft yarn, adopts the bottom right thick drillipg that tiltedly tissue is interwoven on three.Indigo is blue powder (may be partially dark blue), and odorless, is slightly soluble in water, ethanol, glycerine and propylene glycol, is insoluble to grease.Indigoly can be reduced the leuco compound salt that agent is reduced into solubility, easily oxidation by air reverts to the indigo color lake of slightly solubility again.Reaction equation is as follows:
Indigo itself do not have affinity to cotton fiber, and what during dyeing, need to it be reduced into solubility with reductant has the leuco compound salt of certain affinity to cotton fiber, on leuco compound salt, dye to after on fiber again oxidation by air become indigo and form sediment and be adsorbed on fiber.
The present invention, by the principle research of stripping to indigo, determines best stripping agent and the technique of stripping, and the present invention, when carrying out stripping treatment, is mainly through following four-stage:
First stage: indigo reduction becomes the leuco compound salt of solubility.In enough sodium hydrosulfites, caustic soda, on dye the indigo solubility leuco compound salt that is all reduced yellowing on fiber, under the absorption of stripping agent, solubilization, cause molten the falling in the aqueous solution of leuco compound salt greatly, and small part leuco compound salt is because existing affinity still to rest on fabric to fiber.
Second stage: leuco compound salt is oxidized revert to indigo, and emulsified, be dispersed in the aqueous solution.Along with the time lengthening of stripping, strip a small amount of remaining sodium hydrosulfite in liquid constantly by air decomposition and consumption, when sodium hydrosulfite concentration is faded in deficiency, molten drop on leuco compound salt in liquid and be adsorbed on leuco compound salt on fiber surface again gradually oxidation by air revert to insoluble indigo, and the stripping agent emulsification in liquid of being stripped immediately, be dispersed in the aqueous solution, no longer deposit on fabric.
Phase III: the constantly diffusion mobility from inside to outside of the leuco compound salt of fibrous inside, and oxidized, disperse to peel off to the aqueous solution.Along with constantly oxidized, emulsification of the leuco compound salt on fiber surface, dispersion drop in solution, the leuco compound salinity of fiber surface reduces, make the inside and outside leuco compound salt of fiber produce concentration difference, impel the leuco compound salt of fibrous inside to diffuse to the surface gradually migration, and constantly oxidized, emulsification, be dispersed in the aqueous solution, go round and begin again, until inner leuco compound salt all moves.
Fourth stage: the residual indigo color lake being adsorbed on fiber surface of clear water eccysis.Because indigo color lake does not have affinity to fabric, so the indigo color lake that is adsorbed on fiber surface easily by clear water eccysis, now remains in the removal that paregal O on fabric and stripping agent can further help indigo color lake.
Due to the indigo microsolubility that is in water peeling off, after standing a period of time, indigoly can there is sedimentation, through isolated by filtration, indigo can recovery, and the liquid of stripping can be colourless solution, in solution, only contain some inorganic salts (sodium sulphate), caustic soda and some stripping agents, as long as append appropriate sodium hydrosulfite, caustic soda and auxiliary agent, can reuse, reduce the discharge of waste water.
To sum up, stripping agent of the present invention and the technique of stripping, strip effective, and have the extraordinary feature of environmental protection, is suitable for the large-scale promotion of commercial Application.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation:
Fig. 1 is the impact of sodium hydrosulfite consumption on the effect of stripping;
Fig. 2 is the impact of paregal O on the effect of stripping;
Fig. 3 is that stripping agent and paregal O are used in conjunction with the impact on the effect of stripping;
Fig. 4 is quadrature analysis design sketch.
The specific embodiment:
1, experimental subjects and auxiliary agent
Fabric is indigo dyeing jean cloth.
The components description of stripping agent (quality percentage composition):
Bleeding agent 5-10%
Dispersant 20-25%
water surplus
100%。
Bleeding agent is alkylbenzenesulfonate, also can substitute with aliphatic hydrocarbon and alkene sulfonate, fatty alcohol and fatty alcohol ether sulphate, fatty alcohol and aliphatic alcohol polyoxyvinethene phosphate, also can obtain same effect.
Dispersant is polyethylene glycol, also can use polyether nonionic surfactant, polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic to substitute, and also can obtain same effect.
2, the technique of stripping
Technology preparation is as follows:
Sodium hydrosulfite 4-5g/L
Caustic soda (100%) 2-3 g/L
Paregal O 3-5 g/L
Stripping agent 4-5 g/L
Temperature 85-95 ℃
Time 40-50min
Bath raio 20-30:1.
Technological process: according to the weight of fabric and bath raio, the water that injects respective amount in the container of stripping, is warming up to 85-95 ℃, drops into caustic soda, stripping agent, paregal O successively by prescription, finally drop into sodium hydrosulfite, stir and make medicament dissolution, then drop into fabric, stir, circulation or ultrasonic vibration, make fabric and the liquid of stripping there is good relative motion, insulation 40-50min, draining, with clear water washing 2-3 time.
3, effect detection.
According to the above-mentioned technique of stripping, change respectively the parameters such as sodium hydrosulfite consumption, paregal O consumption, stripping agent consumption, and detect respectively it to the strip impact of effect of indigo dyeing jean cloth.
The effect evaluation method of stripping:
With Datacolor SF-600 colour matching instrument, under D65 light source and 10 ° of visual angles, in its maximum absorption wave strong point, measure its reflectivity R, then obtain K/S value by calculating.Gained K/S value is less, and its apparent color depth is more shallow, and the effect of stripping is better.
4, the impact of sodium hydrosulfite consumption.
According to the above-mentioned technique of stripping, change sodium hydrosulfite consumption, caustic soda 2g/L, bath raio is 1:20, and 95 ℃ of constant temperature oscillations 30min that strips, takes out the clean post-drying of cold water flush for sample of stripping, and measures its K/S value, and result is as shown in Figure 1.
As can be seen from Figure 1:
Adopt in the absence of any stripping agent, sodium hydrosulfite concentration be take 4g/L as best, and its K/S value is about 1.Sodium hydrosulfite concentration is too low, indigoly can not be fully reduced into solubility leuco compound salt, and still the form with color lake is adsorbed on fiber, and color can not well be taken off.Sodium hydrosulfite concentration is too high, and consumption is superfluous, and in finite time, sodium hydrosulfite can not exhaust, leuco compound salt can not oxidation by air revert to indigo, solubility leuco compound salt pair fiber has certain affinity, thus on being had, fiber dyes tendency, and it is unclean that fabric is stripped.
5, the impact of paregal O.
According to the above-mentioned technique of stripping, the amount ranges that changes paregal O is 5-15g/L, and sodium hydrosulfite consumption is 4g/L, NaOH is 2g/L, and bath raio is 1:20,95 ℃ of constant temperature oscillations 30min that strips, the taking-up clean post-drying of cold water flush for sample of stripping, measures its K/S value, the results are shown in Figure 2.
From Fig. 2 data, can find out:
Positive role is not played in adding separately of paregal O to stripping, the K/S value of sample is generally than not adding paregal O (to see Fig. 1, K/S value when sodium hydrosulfite consumption is 4g/L, 0.99) height, color is dark, and the consumption of paregal O and the comparatively significantly rule of stripping between effect not can be sought, because paregal O has a solubilization to indigo, make that slightly solubility is indigo has certain solubility in 95 ℃ of aqueous solution, thereby fabric is produced to certain affinity and staining.
6, stripping agent and the impact of auxiliary agent compound use on the effect of stripping.
According to the above-mentioned technique of stripping, by strip liquid and the paregal O compound use of preparation.Wherein: add 5g/L paregal O, and change the consumption of stripping agent, sodium hydrosulfite consumption is 4g/L, and NaOH is 2g/L, and bath raio is 1:20,95 ℃, 30min, takes out the clean post-drying of cold water flush for sample of stripping, and measures its K/S value, the results are shown in Figure 3.
From Fig. 3 data:
After stripping agent and paregal O are used in conjunction with, the effect of stripping is had comparatively to significantly facilitation, when stripping agent QS consumption is 4.0g/L, it is 0.50 that its K/S value reaches minimum, and the effect of stripping when not adding any auxiliary agent is good.Think that two kinds of auxiliary agents play good synergy, indigo emulsion dispersion preferably in solution, in water, is reduced to the contamination to fabric.
7, process optimization.
According to aforesaid experimental result, formulate following orthogonal experiment scheme, as shown in table 1, determine optimised process combination.
Table 1, orthogonal test table.
Note: sodium hydrosulfite consumption is 4g/L, NaOH is 2.0g/L, bath raio is 1:30.
According to the orthogonal experiment scheme of table 1, measure respectively its K/S value, statistics is as shown in table 2, Fig. 4.
Table 2, Orthogonal experiment results table.
| Factor | Paregal O | Stripping agent | Time | Temperature | |
| Experiment | |||||
| 1 | 5 | 3.5 | 20 | 85 | 0.5920 |
| |
5 | 4.0 | 30 | 90 | 0.4594 |
| |
5 | 4.5 | 40 | 90 | 0.1292 |
| |
7 | 3.5 | 30 | 95 | 0.7356 |
| |
7 | 4.0 | 40 | 85 | 0.4288 |
| |
7 | 4.5 | 20 | 90 | 0.4165 |
| Experiment 7 | 9 | 3.5 | 40 | 90 | 0.1972 |
| |
9 | 4.0 | 20 | 95 | 1.4140 |
| |
9 | 4.5 | 30 | 85 | 0.4582 |
| Average 1 | 0.394 | 0.508 | 0.807 | 0.493 | ? |
| Average 2 | 0.527 | 0.767 | 0.551 | 0.358 | ? |
| Average 3 | 0.690 | 0.335 | 0.252 | 0.760 | ? |
| Extreme difference | 0.296 | 0.432 | 0.555 | 0.402 | ? |
As can be seen from Table 2:
While adopting sodium hydrosulfite to strip to denim, the time effects of stripping maximum, is secondly the consumption of stripping agent and the temperature of stripping.
From Fig. 4, can find:
The consumption of paregal O increases, K/S value constantly raises, the effect of stripping is on a declining curve, and when paregal O is used quantity not sufficient, emulsifying effectiveness can not well manifest, consumption is too high, can increase indigo solubility again, thereby causing the staining to fabric, be the best, and the stripping agent consumption coordinating with it be take 4.5g/L as good when paregal O is 5g/L.
The temperature of stripping is too low, is unfavorable for the swelling of fiber, thereby is unfavorable for the migration from inside to outside of leuco compound salt.The temperature of stripping is too high, can increase indigo solubility in water, thereby causes the staining to fiber, and comprehensive, temperature be take 90 ℃ as best.
The control of time of stripping seems very crucial.Time is too short, and leuco compound salt oxidation recovers not exclusively, and part leuco compound salt remains on fiber, can be oxidized to revert to indigo color lake and be adsorbed on the color and luster that presents certain depth on fabric while taking out fabric.Time is oversize, can cause the increase of energy consumption increase and labor cost.The time of stripping is controlled at 40min and can obtains the better effect of stripping.
To sum up analyze, the optimum process that indigo dyeing jean cloth is stripped is: sodium hydrosulfite 4 g/L, and caustic soda 2 g/L, paregal O is 5g/L, stripping agent 4.5g/L, bath raio is 30:1, temperature is 90 ℃, time 40min.
Claims (1)
1. the stripping method of an indigo dyeing jean cloth, it is characterized in that, comprise the following steps: according to the weight of fabric, according to bath raio 1:30, add volume required water, be warming up to 90 ℃, drop into successively caustic soda 2g/L, stripping agent 4.5 g/L, paregal O 5g/L, sodium hydrosulfite 4g/L, stir and make medicament dissolution, then drop into fabric, stir, circulation or ultrasonic vibration, insulation 40min, draining, with clear water washing 2-3 time;
Described stripping agent comprises following composition by weight percentage: bleeding agent 5-10%, and dispersant 20-25%, surplus is water; Described bleeding agent is any one of alkylbenzenesulfonate, sulfonated aliphatic hydrocarbon, fatty alcohol and fatty alcohol ether sulphate, fatty alcohol and aliphatic alcohol polyoxyvinethene phosphate; Described dispersant is selected from any one of polyether nonionic surfactant, polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic.
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