The method of multi-stage peroxide bleaching fabrics of flax-containing

 

The invention relates to the textile industry, in particular to a method of bleaching fabrics. Describes how multi-stage peroxide bleaching of flax-containing tissues, including rasshifrovka in the presence of oxalic acid at a concentration of 0.5-0.8 g/l sidezym enzymatic preparations Aquasim 240L and Wiscosin L at concentrations of 0.5-0.8 and 0.2-0.5 g/l, respectively and wetting, two-stage high-temperature blanching with an intermediate low temperature bleaching in aqueous alkaline peroxide solution and acidification for 15-20 minutes Method allows to reduce the duration of the process, to improve environmental safety, as well as to increase the capillarity and the strength of the fabric. table 1.

The present invention relates to a method of bleaching fabrics of flax-containing and can be used in the textile industry for the preparation of the fabric before dyeing and printing or to obtain bleached fabrics.

Known methods of blanching awarded pure and semi-linen fabrics (base cotton yarn, weft - flax yarn) to obtain a high whiteness, consisting in the sequential processing tissue hypochlorite and peroxide solutions [Reference him what oterom fabric consistently first treated with an organic acid or spend oxidizing degumming then bleach with sodium hypochlorite, followed by hydrogen peroxide [Ivlev, A., improving the technology of bleaching linen fabrics, proc.Dokl. Chemistry-96, Ivanovo. 1996, c.173]. This reduces the concentration of active chlorine in hypochlorite solutions in processing and eliminating intermediate washing between hypochlorite and peroxide treatments. However, it is not possible to completely abandon the use of chlorine bleach.

There is also known a method of bleaching semi-linen fabrics [Technology of bleaching fabrics of flax-containing/R. D. Bilyaletdinov, C. M. Rakitin/INF.the message of CNIEL, Textile industry, Moscow. 1987. 11, a - c.10-11]. According to this method are rasshifrovka, degumming alkaline solution, acidification, peroxide bleaching, acidification and neutralization. This treatment provides high quality bleaching semi-linen fabrics while reducing consumption of oxidants, but it is not suitable for bleaching linen fabrics and, therefore, is not universal, as applicable for blanching limited range. The use of alkaline otwarte significantly reduces the mechanical characteristics of the flax component.

Closest to the claimed by nudestocking leaching water [Friedland, And. Finish linen fabrics/M, Light and food industry, 1982, S. 174-188]. The method is carried out consistent with carrying out the following operations: 1 stage. Desizing comprising impregnation of the fabric at a temperature of 50-60oWith a solution containing, g/l: Wetting - 0,25-0,3 Oxalic acid - 2-2,5 and aging 60-90 minutes Then the fabric is washed with water at 50-60oC.

stage 2. High-temperature bleaching. It consists in the impregnation whitening solution at 50-60oWith and use at 85-90oC for 60-90 minutes Then the fabric is washed in hot water at 65-70oAnd cold water.

The impregnated fabric is a solution containing, g/l: magnesium Sulfate - 0,15-0,2 sodium Tripolyphosphate - 0,25-0,3 Silicate or metasilicate sodium - 2,3-2.5 Peroxide, counting on the active oxygen - 1,8-2,0 3 stage. Low-temperature bleaching. It is carried out by impregnation of the fabric with a solution containing, g/l:
Sodium hypochlorite (in terms of active chlorine) - 1,8-2,7
The wetting - 0,25-3
Sodium silicate - 2,5-3
Then the fabric vylivaetsya for 60-90 min at 18-23oC. After which it is washed with hot water at 65 to 70oWith cold water.

stage 4. High-temperature bleaching. Handling of tissue are the same as Nar>oS, after which the tissue was incubated for 30 minutes followed by rinsing with cold water, a solution of soda ash 0.6-0.8 g/l and again with cold water.

The disadvantages of the prototype
1. The long duration of the process due to ineffective rasshifrovka and long-term acidification. Despite the fact that modern processes shorter pre-existing, but their duration is still considerably higher than used for bleaching cotton fabrics and is not less than 5 furlongs. This is because linen fabrics contain more recellular impurities and have a higher surface density. Only a linen cloth made from yarn almost full white (with application in the processing of rovings of sodium chlorite or oxidative otwarte), can be processed at approximately the same time as cotton. Speed impact of chemicals on impurities flax fiber ensures minimal degradation of cellulose and reduces the risk of colonizatio fiber, i.e., splitting into shorter fibers. Therefore, the reduction of the stages of the process by increasing the concentration of chemicals in solution in the bleaching of linen Volokitin substance. The use of sodium hypochlorite in production requires very careful control of process parameters, as deviation from them, for example, in the forced shutdown leads to a sharp decrease in the degree of polymerization of cellulose, in some cases, reduction of white in the education of oxycellulose. Catalytic decomposition of hypochlorite solutions with simultaneous degradation of cellulose occurs under the action of oxide of iron. To prevent this phenomenon, the apparatus for hypochlorite treatment should be made of stainless steel and additionally covered with a film of lacquer. The use of sodium hypochlorite is complicated by the need to ensure a safe work environment for staff. Equipment for preparation of the feed solution inlet pipe and the apparatus must be sealed. Installation must be equipped with emergency exhaust ventilation system which is not dependent on the General ventilation system of the room. At the moment, a significant difficulty is the transportation of chlorine-containing compounds, which require special protection of the cargo on the whole route. All of the above circumstances Ave is or toxic chlorinated contaminants and lower quality products in accordance with environmental standards and the loss of strength of the fabric due to the degradation of cellulose. This in turn reduces the competitiveness of linen and semi-linen fabrics in the world market of textile products.

3. Insufficient tissue capillarity and significant damage to the cellulose fibers due to partial degradation of cellulose fibres under rasshifrovka as a result of high acidity environment and significant damage to the cellulose fibers in the effects of sodium hypochlorite on the 3rd stage.

Thus not known environmentally friendly, less time consuming way to get quality bleached flax-containing fabric
Object of the invention is to find a way to blanching of flax-containing tissues, including rasshifrovka in the presence of oxalic acid and wetting agent, two-stage high-temperature blanching with an intermediate low temperature bleaching and acidification, which would allow for high environmental safety and short duration to get high quality fabric.

The problem is solved by the method of multi-stage peroxide bleaching of flax-containing tissues, including rasshifrovka in the presence of oxalic acid and wetting agent, two-stage high-temperature blanching with intermediate nizkotemperaturnyi enzymes Aquasim 240L and Wiscosin L at concentrations of 0.5-0.8 and 0.2-0.5 g/l, respectively, low-temperature bleaching is carried out in aqueous alkaline peroxide solution, and acidification for 15-20 minutes

The advantages of the proposed method are:
the reduction in the duration of processing the tissue by reducing the stage of rasshifrovka, acidification, and linen fabrics - peroxide bleaching;
- improvement of the ecological situation for staff and characteristics of the waste process water by eliminating the use of sodium hypochlorite;
improving the capability and strength of the fabric through effective rasshifrovka facilitating the removal of the dressing and recellular impurities and without degradation of cellulose fiber and bleaching using hydrogen peroxide, which has less destructible effect on the cellulose fibers.

Information regarding the playback of the invention.

As rasshifrovyvaya reagents used sidezym enzymatic preparations Aquasim and Wiscosin.

The drug Aquasim 240L is a product of microbiological synthesis of the microorganism Bacillus and has a standard activity 240 u/g protein (passport 1999-08-19 corresponding to the EEC Directive 91/155/EEC with amendments and recommended "ASO is t a liquid brown enzymatic protein contains-amylase. Code drug IU - 3.2.1.1., code CAS-9000-90-2, code EINTCS - 232-565-6. For LD-50>2 g/kg body weight in rats, the drug is classified as "non-toxic", LC 50 (fish)>100 mg/l, EC-50 (Daphnia)>100 mg/l and IC-50 (Daphnia)>100 drug classified as "not dangerous" for the environment. The drug berasain.

Drug Viscosum L is a product of microbiological synthesis of Asp. aculeatus and has a standard activity of 100 u/g of protein. The drug is a multienzyme complex that includes carbohydrates, arabinose, cellulase,-glucanase, hemicellulase, the xylanase. Passport of the drug 2001-03-12 corresponding to the EEC Directive 91/155/EEC with amendments and recommended by the Association of manufacturers of fermentation enzyme products (AMFTP), firm Novo Nordisk, Denmark). The product is a transparent liquid brown enzyme protein. Code drug IUB -3.2.1.6., code CAS - 62213-14-3, code EINTCS - 263-462-4. For LD-50>2 g/kg body weight in rats, the drug is classified as "non-toxic", LC 50 (fish)>100 mg/l, EC-50 (Daphnia)>100 mg/l and IC-50 (Daphnia)> 100 drug classified as "not dangerous" for the environment. The drug berasain.

The drug Neonol AF 9/10 is netglimse on the basis of secondary fatty alcohols. The product has the appearance of a thick pasty mass of light brown, soluble in water. THE 2483-07-057-66-801-98.

The invention is carried out as follows.

Example 1.

1 stage. Desizing. It consists in impregnating and curing in cold within 30-45 minutes the Impregnated fabric at 50-60oTo provide a solution containing, g/l:
Aquasim - 0,5
Wiscosin - 0,2
The wetting agent (Neonol) - 0,25
Oxalic acid - 0.5
Fabric vylivaetsya 45 min and washed with water at 50-60oC.

stage 2. High-temperature bleaching. It consists in the impregnation whitening solution at 50-60oWith and use at 85-90oFor linen fabrics 90 min for semi-linen fabrics 60 min and wash cloth with hot water at 65 to 70oWith cold water.

The impregnation of the fabric provide a solution containing, g/l:
Sulphate magnesium - 0,15-0,2
Sodium tripolyphosphate - 0,25-0,3
Silicate or metasilicate sodium - 2,3-2,5
Hydrogen peroxide, counting on the active oxygen - 1,8-2,0
3 stage. Low-temperature bleaching. The impregnated fabric is conducted with a solution containing the same reagents as in stage 2, but when 18-23oWith the maturing of fabric for linen fabrics 90 min for semi-linen fabrics - 60 min at 18-23oC. The bleaching. The machining conditions (composition of the impregnating solution, the temperature and duration of treatment) tissue are the same as in stage 2.

5 stage. Acidification. Impregnation of the fabric with a solution of oxalic acid, and 0.5-0.8 g/l at 50-60oWith and keeping 15-20 minutes followed by rinsing with cold water.

Example 2.

1 stage. Conditions rasshifrovka as in example 1, but carry out impregnation with a solution containing, g/l:
Aquasim - 0,8
Wiscosin - 0,5
The wetting Neonol - 0,25
Oxalic acid - 0,8
The second, third, fourth, and fifth stage is identical to the same stages in example 1.

Technical results of the processing of flax-containing tissue in the table.

The white fabric was determined according to GOST 18054-72. (Fabric textile. Methods for the determination of white fabric) Capillarity tissue was determined according to GOST 3816-81 (Fabric textile. Methods for determination of hygroscopic and water-repellent properties). Tissue damage was determined by the value of the specific viscosity of 0.1% solutions of cellulose in copper-ammonia reagent according to GOST 8837-83 (textile Materials). The mass loss of the material was determined by the difference between the mass of the untreated sample and the sample after bleaching.


Claims


 

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FIELD: textile industry.

SUBSTANCE: composition contains hydrogen peroxide, aqueous ammonia, silicate-containing hydrogen peroxide stabilizer, nonionic or anionic surfactant, and water, said stabilizer being, in particular, taken separately or in various proportions to each other substances selected from group including kaolin, talc, bentonite, zeolite sorbent, and diatomite.

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2 tbl, 6 ex

FIELD: light and fur industry.

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2 tbl

FIELD: light industry, in particular, raw material dyeing processes used, for example, in whitening of mink skin fur hair.

SUBSTANCE: method involves providing additional tinning of skin with aqueous composition containing sodium chloride, composition based on low-molecular alcohol polyacetals, mixture of non-ionogen surfactants and cyclic terpenes; whitening for 2.0-4.5 hours with the use of aqueous composition containing sodium chloride, potassium persulfate, composition based on mineral and organic acids as pH stabilizers, mixture of primary fatty alcohols as protective admixture and 30%-hydrogen peroxide; providing reduction with the use of aqueous composition comprising sodium chloride, oxalic acid and mixture of non-ionogen surfactants with cyclic terpenes.

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2 tbl

FIELD: process for treatment of textile materials, in particular, whitening of flax fiber for producing of hygroscopic wool used for medicine purposes.

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EFFECT: increased whitening extent, capillarity and moisture absorbing capacity of wool produced.

2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: particles contain inner coating layer that consist of at least one hydrate-forming mineral salt, and outer coating layer, including 0.2-3 wt % alkali metal silicate with module more than 2.5, particularly 3 to 5. Outer layer is obtained using alkali metal silicate solution with alkali metal silicate concentration 2 to 20 wt %. Dissolution time can be extended by alkali metal silicate concentration lowering in solution used, coating material amount being the same. Dissolution time can be extended significantly according to coating layers sequence and solution concentration with low quantity of alkali metal silicate.

EFFECT: extension of dissolution time.

18 cl, 7 tbl, 18 ex

FIELD: chemistry.

SUBSTANCE: invention relates to bleaching compositions, which in fact do not contain peroxide bleaches, for bleaching of fabrics. Described is liquid bleaching composition with pH 10 or lower, which contains: (a) complex compound of transitional metal as catalyst of bleaching in air, (b) from 0.001 for 3 wt/wt % of odorant.

EFFECT: obtaining composition, whose bleaching activity is more, than 10 times higher as compared with bleaching activity of composition, containing as odorant molar equivalent of citronellal.

5 cl, 3 tbl, 62 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns methods of flax fiber dyeing and preparation for spinning and can be applied in textile industry. Combined method of dyeing and preparation for spinning involves deacidification, processing by digester dye solution for 90-95 minutes at 40-50°C, the solution including vat colour, sodium bicarbonate, sulfonol NP-3 and anhydrous synthanol, polyenzyme preparation with enzyme activity indicators, units per ml of solution: endopolygalacturonase - 20-40; pectinesterase - 2.5 - 8.0; protease - 0.2-0.4; exopolygalacturonase - 0.6-1.5; exogalactosidase - 0.3-0.5; exoxylosidase - 0.3-0.8; exoglucanase - 0.4-1.0. Further the mass is heated to the boiling point, matured for 30-60 minutes, flushed by cold water. Oxidising processing is performed for 15-25 minutes at 20-25°C in stabilised peroxide solution including 0.3-0.4 g/l of hydro peroxide (100%), 1-2 g/l of laundry soap, and alkaline agents to comprise total alkalinity of 5.5-6.0 g/l rated per caustic soda, with further heating for 20-50 minutes to 95-100°C and maturing for 20-30 minutes, followed by double flush with detergent first and with water next, and further deacidification at 45-50°C for 15-20 minutes and flushing.

EFFECT: reduced irregularity of geometrical parametres and durability of flax semiproducts; improved colorability and colour evenness of textile semiproducts; more environment-friendly process and improved labour health.

1 tbl, 3 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns method of flaxen roving preparation for spinning and can be applied in textile industry. Method of enzyme and peroxide preparation of flaxen roving for spinning involves deacidification performed before enzyme processing for 90-95 minutes by polyenzyme preparation solution with enzyme activity indicators, units per ml: endopolygalacturonase - 20-25; pectinesterase - 0.8-4.7; protease - 0.2-0.3; and exopolygalacturonase - 0.2-0.4. Further the roving is flushed by water and processed for 90-95 minutes in alkaline peroxide solution at hydro peroxide concentration of 0.4-0.5 g/l of active oxygen and total alkalinity of 6.5-7.0 g/l rated per caustic soda, then flushed with detergent and water and undergoes counter-microbe processing.

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1 tbl, 3 ex

FIELD: textile, paper.

SUBSTANCE: invention concerns method of flaxen roving preparation for spinning and can be applied in textile industry. Method of enzyme and peroxide preparation of highly lignified flaxen roving for spinning involves deacidification, enzyme processing at 40-50°C for 90-95 minutes by polyenzyme preparation solution with enzyme activity indicators, units per ml: endopolygalacturonase - 20-25; pectinesterase - 2.5-4.7; protease - 0.2-0.3; exopolygalacturonase - 0.6-0.1; exogalactosidase - 0.2-0.4; exoxylosidase - 0.3-0.5; and exoglucanase - 0.6-0.8. Further the roving is heated to the boiling point and matured for 20-25 minutes, flushed by water and processed for 90-95 minutes in alkaline peroxide solution at hydro peroxide concentration of 0.6-0.8 g/l of active oxygen and total alkalinity of 6.5-7.0 g/l rated per caustic soda. Then the roving is flushed with detergent and water and undergoes counter-microbe processing.

EFFECT: fiber whitening degree enhanced up to 54-56%; obtainment of thin yarn meeting the requirements for both "1 high-flaxen" and "1 high tow" grades by GOST 10078-85 in line density and line density and tear load variation rates; reduced yarn tear rate in weaving process to 40-50 tears for 100 spindles per hour; enhanced yarn strength in 1,2-1,4 times; improved esthetics of woven canvas exterior.

1 tbl, 3 ex

FIELD: textile, cotton.

SUBSTANCE: invention refers to the textile industry in particular, to the technology of the bleaching of flax-containing fabrics and can be used for the production of the bleached woven linens or for the preparation of the fabrics for colouring and stamping. It describes the method of the fermentation and peroxide bleaching of the flax-containing fabrics including enzymatic procession by the soaking into the 40-45°C solution of the multienzyme preparation with the indicator the enzyme activity, in un/ml: endopolygalacturonase - 7-10; α-amylase - 8.8-9.2; β- amylase - 0.5-0.6; γ- amylase - 0.2-0.5; pectinesterase - 1.0-1.5; exopolygalacturonase - 0.5-0.7; exogalactosidase - 0.3-0.4; exoxylosidase - 0.2-0.3; exoglucanase - 0.3-0.5, with the addition of the sodium bicarbonate 20-25 g/l and penetrating agent, maturing the wet squeezed fabric and its steaming in 85-95°C temperature during 20-30 min.; intermediate washing with the acidification in oxalic acid solution 2.5-5 g/l, high-temperature peroxide bleaching by the stabilised alkaline-peroxide solution with the peroxide concentration 2.2-2.9 g/l with active oxygen for one stage, washing and drying.

EFFECT: invention helps to increase the level of the removal of starch size before peroxide bleaching up to 80-85%; it increases the speed of the capillary soaking of water solution and improves uniformity of the capillary characteristics of the fabric; it increases the strength properties of the fabric, decreases its rigidity to 96-125 mN·cm2 because of larger removal of the lignin; it decreases the attenuationof the dyeing of colour warpings of the tapestry linens; it simplifies the process and reduce its duration.

2 cl, 1 tbl, 3 ex

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