Method of bleaching linen fibres for production of medical supplies

FIELD: textiles, paper.

SUBSTANCE: method of bleaching linen fibres for production of medical supplies is proposed, consisting in that the following operations are carried out in sequence: treatment with sulphuric acid solution and subsequent washing at a temperature of 25-30°C for 25-30 minutes, oxidative cooking with the alkaline solution of hydrogen peroxide containing stabiliser, in stages for various values of the silicate-alkali modulus, first at a temperature of 20-25°C at a module of 0.5-0.6 for 10-15 minutes, then at a module of 0.8-0.9 for 10-20 minutes, and then at a module of 1.0-1.1 for 30-60 minutes at a temperature of 70-75°C, after that the temperature is raised to 96-98°C and maintained for 30-60 minutes, then the module is reduced to 0.4-0.5 and cooking is continued for 30-60 minutes, bleaching in the alkaline solution containing the same substance as the solution for the oxidative cooking, washing with water and final oxidation with aqueous solution of acetic acid.

EFFECT: invention enables to improve the efficiency, environmental friendliness of the method and to obtain bleached fibres with high properties of bleaching, capillary capacity, normalised content of chloride, calcium and sulphate salts.

4 cl, 2 tbl

 

Introduction

The invention relates to the textile industry and can be used to produce bleached flax fiber for the manufacture of wool, non-woven materials and medical products based on them (wound coverings, napkins, proteros etc), as well as the manufacture of cellulose matrix for immobilization in her functional drugs (antimicrobial, anesthetic, hemostatic, medical etc) upon receipt dressing devices of new generation or matrix-carrier cosmetic and therapeutic agents for use in cosmetics and household.

The level of technology

The important task of reducing dependence on imports, the development of raw material base and meet the ever growing demands of consumers for quality, environmental, safety and comfort products are resolved with the use of domestic bast fibres, especially linen. The feasibility of manufacturing on the basis of modern high-tech competitive materials medical, hygienic and beauty destination due to the superiority of flax fibers for hygienic and medical-biological properties on cotton fiber and hydrocellulose. Years of practice flax-containing materials have proven their ability to regulate taproom is h, to inhibit the activity of the microflora, to accelerate the healing of wounds, not to cause allergic reactions, reduce the effects of radiation and other [RHJ them. Mendeleev, 2002, No. 2, pp.31-35].

This creates the conditions for a more rational use of relatively inexpensive, but valuable for its natural properties, products linoperamata (short fibers, waste scutching, feathering, etc.), whose share exceeds 2/3 of the total volume produced flax fibers. Not conforming enough hard length requirements for processing by the system of the wet spinning process, these fibers are mainly used for rough technical materials. At the same time clearing from fires and natural impurities can be applied in the manufacture of high quality medical, hygienic and cosmetic products, for example, on the basis of non-woven materials, unique properties which are provided by the properties of raw materials, and due to the original structures of non-woven sheets.

To cellulosic fibres used in medicine, as it is known [GOST 5556, Textile industry. - 1998. No. 6. - P.21-22], demands a high degree of purification from impurities and high degree of whiteness, which show the following main indicators are manufactured from cotton wool medical [GOST 5556]:

Capillarity, mm, not less than70,0
Absorbency, g, not less than19,0
Ash content, %, max0,3
The content of fatty and waxy
substances, %, no more than0,35
Whiteness, %, not less than72,0
The reaction of aqueous extractneutral
The content of reducing substancestraces
Infestation, %, max0,3
Mass fraction of short fibers
(less than 5 mm), %, not more than0,15
The content of impurities:
needles, chips, etc. (>3 mm)% not allowed

In addition, the fibers for the manufacture of medical materials impose environmental requirements the security-related tactile comfort, and the absence of allergenicity.

Fiber flax contain a greater amount of natural impurities (22-25%) compared with cotton (4-6%) and together with cellulose (71,2-78,0%)include hemicelluloses (13,6%), pectin (2,8-3,2%), nitrogen (1,9-2,1%), ash (1,3%), waxy substances (1,7-2,7), lignin (2,2-3,8%) [Zhivetin CENTURIES and other Flax and its comprehensive use. M., 2002. 394 C.]. In modern domestic varieties of flax lignin may exceed 10%. In addition, they contain foreign material in the form of remnants of the stem ("fires"), chips, needles and other

As is known, natural impurities from vegetable fibers are removed by chemical treatment, weed the same impurities and remove the fire mechanical treatment, mainly to chemical treatment. Because of technical fibers in the process of mechanical and chemical treatments break up into smaller complexes, the intensity of the mechanical and hardness chemical treatments should be chosen with regard to the parameters of the fibers (linear density, massoglia)ensure manufacturability during subsequent processing, for example in the manufacture of nonwoven materials.

Various chemical methods of obtaining bleached flax.

The most effective known method of bleaching and purification) is elocon is way chlorine peroxide bleaching, in which achieved high levels of white (72%) and the effective removal of impurities [Handbook of chemical processing technologies linen fabrics / Ed. by G.I. Friedland. M: Light industry, 1973, p.64-65].

However, the use of expensive imported, corosion-hazardous and extremely hazardous reagent of sodium chlorite and makes it impossible to use this method.

Well-known and widely used in practice, single-stage and two-stage methods bleaching of flax rovings during its preparation for wet spinning. When one-step methods processing of flax fibers is carried out only alkaline oxidizing solutions, and at the two-stage - alkaline-oxidative and alkaline-reducing solutions in various sequences. However note that the reason for the lower white flax fiber in the two-stage process alkali degumming/bleaching is the condensation products of partial hydrolysis of impurities occurring during alkaline cooking [Handbook of chemical processing technologies linen fabrics / Ed. by E.R. Shelkovskoy. M: Light industry, 1973. - P.50-66].

The disadvantages of these methods are low white indices (less than 60%), capillarity and adsorption capacity of the fibers.

When exposed to chemicals in the fibers of the flax RA is violated components, located in the middle of the plates and providing a bond elementary fibres in technical complex fiber. Consequently weaken inter-fiber connectivity, which makes flax fiber is suitable for crushing in the process of pulling on spinning machines. About the necessary degree of extraction of the impurities in the preparation of rovings for spinning evidenced by the reduction of its breaking load in a wet state. The breaking load Rove, well prepared for spinning, dropping 6-8 times compared to its strength in the severe form [Handbook. The spinning of flax and chem. fibres // ed Adams LB, Ginzburg LB M., 1991, - s-320].

There is a method of oxidizing cooking flax rovings in the apparatus of periodic action type AAA, including the processing of air-dry rovings aqueous solution of sulfuric acid, washing with water or neutralization of the residual acid in caustic soda solution, boiling at 95-98°C for 60-90 min aqueous alkaline solution of hydrogen peroxide at a concentration of 1.3-1.7 g/l (active oxygen) when the total alkalinity of a solution of 4.7-9.5 g/l (in terms of sodium hydroxide) in the presence 9-20 g/l of sodium silicate, subsequent flushing of debris and alkaline agents [Handbook of chemical processing technology of linen fabrics, edited by G.I. Friedland. Meters, Light industry, 1973, p.55-56].

Weeks the STATCOM method is its limited ability to extract impurities from flax fibers with lignin content of more than 3-3 .5% (coarse and very coarse) and low brightness.

Even more limited in the ability to achieve high purity and high whiteness flax rovings known oxidation method of cooking involving the complete replacement of silicate stabilizer in the peroxide-based solution of sodium carboxymethyl cellulose (0.1 to 1.0 g/l) and one low-temperature washing instead of two high temperature [U.S. Pat. RF 2188261, 2002]. Given the high values of the breaking loads (37.6-45.3 h), 1.6-2 times higher than those achievable in conventional technology oxidative cooking (22.9-27.5 n), provide an indication of the deterioration of quality of preparation of flax fibers in the absence of a silicate stabilizer.

Thus, known environmentally safe ways of refining flax rovings not allow you to get flax fiber, suitable for the manufacture of medical supplies. They do not provide the flax fibers for the desired level of whiteness, capillarity, wettability and purification from impurities.

Known two-stage methods of chemical processing mechanically cleaned short flax fibre for the manufacture of wool medical. They perform by carrying out the first stage of a long (120-210 min) high-temperature alkaline cooking (120-140°C) in the presence of surface-active substances or reducing agents, and the second hundred of the AI to achieve high whiteness apply hypochlorite solutions [U.S. Pat. RF 2104358, 1998 and 2078163, 1997]. In the first case are twofold treatment with hypochlorite (1-2 and 2-3 g/l) with pre-acidification with sulfuric acid (2-4 1.5-2.5 g/l) without intermediate rinsing, and in the second case is treated with solution of hypochlorite (2,8-4 g/l)containing 4 g/l of sulfuric acid.

The main disadvantages of these methods are energy intensive cooking, a high degree of degradation of cellulose and low environmental friendliness due to the use of acidic solutions of hypochlorite. In the latter case, the conditions under which outstanding environmentally hazardous reagent Cl2that makes environmentally dangerous process and that is especially important for medical supplies, environmentally unsafe produced product. Acidic hypochlorite solutions are not recommended for use, and production schedules processing of cellulosic materials include the establishment alkaline environments [Melnikov B.N. and other Physico-chemical basis of the finishing processes of production. M: Light and food industry, 1982, p.87].

Known methods for producing bleached flax fibers for the production of wool health without the use of chlorine-containing reagents.

Known two-stage method of chemical processing mechanically cleaned short flax fiber, including long-term (120150 min) high-temperature cooking (at 120-135°C) solution of sodium hydroxide (3-20 g/l) in the presence of reducing agents and chelating agents and bleaching for 120 minutes with an alkaline solution, containing silicate stabilizer and 8-12 g/l of hydrogen peroxide (100%) [U.S. Pat. RF 2175363, 2001].

The main disadvantages of this method are the high energy consumption of the process and intensive condensation products of destruction of impurities in high-temperature cooking in solutions with a high concentration of sodium hydroxide (20 g/l). Education dark-colored condensation products complicates the bleaching of fibers, therefore, to achieve the desired whiteness is proposed to use a solution of hydrogen peroxide in high concentrations (8-12 g/l). Decomposition of these quantities H2O2within the proposed 120 minutes is excessive release of gaseous products, which leads to unacceptable increase in pressure in the apparatus type AAA, currently used for processing flax rovings and fibers in the mass. This technology cannot be scaled, it cannot be implemented in industry.

According to reference literature, the concentration of hydrogen peroxide in the compositions for oxidative cooking flax fibers (for 105-120 minutes) do not exceed 2 g/liter of active oxygen [Handbook of chemical processing technologies linen fabrics / Ed. by E.R. Shelkovskoy, M.: Light industry, 1973. - P.50-73].

Known methods for producing bleached flax, in which pre-extracted the e impurities and subsequent bleaching are peroxide-based solutions.

A method of obtaining bleached flax for the production of wool medical, chemical processing mechanically cleaned flax fibers with a linear density of no more than 2.0 Tex is accomplished by acidification of the fiber with a solution of sulfuric acid (1.0-1.5 g/l), leaching, oxidative cooking at a temperature of 96-98°C (110-120 min) in a solution containing 1,5-1,9 g/l (in terms of active oxygen) hydrogen peroxide, silicate stabilizer, alkaline agents, complexing agent and a salt of magnesium, the subsequent processing is similar to the solution containing 1.0-1.5 g/l (in terms of the active oxygen) hydrogen peroxide, silicate stabilizer, alkaline agents, complexing agent and a salt of magnesium, with intermediate and final washes with hot and cold water [U.S. Pat. RF 2191231, 2002].

The disadvantages of the method are limited opportunities in achieving the desired degree of cleaning of the fibers with a high content of lignin and the lack of opportunities to improve the performance of the apparatus AAA by increasing the mass of the processed material, as used low concentrations of hydrogen peroxide do not allow to provide high quality processed fibres by reducing specific consumption of hydrogen peroxide. The process when a liquid module (sootnoshenie the mass of the solution and the weight of fiber) of less than 10 leads to a decrease of whiteness and capillary flax fibers.

There is a method of bleaching mechanically cleaned flax fibers with a linear density of 0.3-0.4 Tex by treatment with 2.8-3.0%-s ' solution containing hydrogen peroxide, acetic acid (at a ratio 1:2) and mineral acid at 85-90°C (55-60 min), followed by traditional oxidative pulping in the presence of hydrogen peroxide, silicate stabilizer and alkaline agents (110-120 min), hot and cold washes, treatment with sodium hydroxide solution 140-150 g/l at 16-20°C (20-30 min), cold rinsing, and kislovka [U.S. Pat. RF N 2078164, 1997].

The disadvantages of the method are the complexity, duration, low efficiency and environmental hazard process because of the high concentrations of chemicals, including volatile acetic acid. If this is not achieved the desired quality of a product due to a high degree of degradation of cellulose due to the long 50-60 minute exposure to hot (85-90°C) solutions containing mineral acids, followed by a 30 minute exposure to a highly concentrated alkaline solution and the need for intensive stage of neutralization, as provided for cold rinsing is not possible to remove adsorbed alkali. Traditionally, after the processing of highly concentrated solutions of alkali leaching is carried out at a temperature of 75-95°C to follow what she neutralization. In addition, there is a risk of significant loss of pulp due to the collapse of initially thin and short fibers (0.3-0.4 Tex) in conditions of harsh chemical processing.

Closest to the claimed is a method of bleaching mechanically cleaned (to a residual content of fires not more than 1.5%) of flax fibers (short, feathering) to obtain wool [U.S. Pat. RF 2265094, 2005]. It is carried out by operations of chemical processing mechanically cleaned flax fiber, including:

- kislovka fiber at a temperature of 50-60°C for 20-30 minutes with an aqueous solution containing (g/l):

sulfuric acid (100%)1,0-3,0
non-ionic wettingof 0.1-0.3

two washing with hot water at a temperature of 50-70°C for 15 minutes;

- oxidative boiling at a temperature of 95-100°C for 60-90 minutes in a solution containing the following components (g/l):

hydrogen peroxide (100%)3,0-5,0
caustic soda (100%)8,0-10,0
the stabilizer composition of Diary based
oksietilidendifosfonovaya acid0.1 to 0.3
the nonionic wetting agent of the type,0.5 to 1.0
for example, the wetting EM LC-based
ethoxylated fatty alcohols
when total alkalinity9,0-11,0

with the rise of temperature to 95-100°C for 45-60 minutes.

two washing with hot water at a temperature of 50-70°C for 15 minutes;

- bleaching at a temperature of 95-100°C for 60-90 minutes in the solution, with the following content of components (g/l):

hydrogen peroxide (100%)2,0-7,0
caustic soda (100%)3,0-8,0
the stabilizer composition Diurin
on the basis of oksietilidendifosfonovaya acid0.3-0,7
the nonionic wetting agent of the type,0.3 to 1.0
for example, the wetting EM LC-based
ethoxylated fatty alcohols
softner Tracker IFG0.5-2,0

with the rise of temperature to 95-100°C for 45-60 minutes.

- rinse with hot water at a temperature of 60-70°C for 15 minutes;

- kislovka sulfuric acid solution of 1.0-3.0 g/l at a temperature of 25-50°C for 15 minutes;

- rinse hot and cold water;

- avevano processing solution containing a softening agent on the basis of the higher fatty acid in a concentration of 0.5-1.0 g/L.

However, the method has drawbacks.

1. Low efficiency due to irrational spending of chemicals due to the decrease in the reaction zone volume peroxide-based solutions while increasing the pressure above the allowable apparatuses AAA (AKDN, DPT, AAA), used for treatment of fibrous mass. The design of these devices is provided by the pressure drop due to the discharge into the sewer part of the technological solution. The pressure increase is the result:

- use organic stabilizer (the composition of Diary) in low concentration (0.1 to 0.3 and 0.3-0.7 g/l) with complete exclusion of silicate stabilizers, which does not allow to prevent excessive separation of gaseous decomposition products of the peroxide is in solution with high alkalinity (8-11 g/l); as is known, organic stabilizers are inferior in efficiency silicate that in such conditions of oxidative cooking rovings are used in a concentration of from 9 to 20 g/l;

- use of hydrogen peroxide in high concentrations (5-7 g/l) for the proposed short period of time (about 105-150 min), leading to excessive release of gaseous products of its decomposition;

- high foaming when pumping through the fibrous mass solutions of hydrogen peroxide with a high content of surfactants (0.5-1.0 g/l) and a softener (0.5-2.0 g/l).

2. Low quality of fiber, such as whiteness, capillarity, time wetting. This is due to the following factors:

- reduction of specific costs of hydrogen peroxide and caustic soda per unit fibrous mass by reduction in the reaction zone volume of technological solutions;

- high content of short fibers by oxidative cooking flax fibers for soft and medium-soft in solutions with high alkalinity (9,0-11,0 g/l); these fibers, it is recommended to use a much lower concentration of the alkaline agents [Handbook of chemical processing technologies linen fabrics / Ed. by E.R. Shelkovskoy, M.: Light industry, 1973. - P.50-73];

- applying a softener to bleached flax fibre after which it the stage of the technological process, that may violate a set of GOST 5556 requirement of ensuring the neutrality of aqueous extract of cotton wool medical;

- danger message allergenic properties and toxicity of the flax fibers when applied to them a softener in the final stages of processing (without subsequent rinsing).

3. Low environmental technology because of its high content in solutions of surface-active substances (in aggregate, the process of wetting to 2.3 g/l and a softener to 3 g/l) and significant exceedance of these substances in wastewater (if provided by the technology of low dilution of active media leaching waters).

The invention

Object of the invention is to find a way to bleaching of flax fibre for the manufacture of medical supplies, including kislovka, leaching, oxidative boiling in an alkaline solution comprising hydrogen peroxide and a stabilizer, washing, bleaching, washing and final kislovka, which would improve its efficiency, quality fibers and environmentally friendly way.

The problem is solved by the method of bleaching of flax fibre for the manufacture of medical supplies, including kislovka, leaching, oxidative boiling in an alkaline solution comprising hydrogen peroxide and a stabilizer, washing, bleaching, washing and bookmark the large kislovka, in which oxidative boiling is carried out in stages at different values of silicate-base module, first at a temperature of 20-25°C in a module of 0.5-0.6 for 10-15 minutes, then at module 0,8-0,9 within 10-20 minute, then at module 1,0-1,1 within 30-60 minute at a temperature of 70-75°C, after which the temperature was raised to 96-98°C and incubated for 30-60 minutes, then the module down to 0.4-0.5 and continue cooking for 30 to 60 minutes, the bleaching is carried out in alkaline solution containing the same substance that in solution for oxidative cooking, kislovka carried out at a temperature of 25-30°C, and washing after kislovka spend once with cold water.

When you do this:

the solution for oxidation of cooking contains components in the following ratio (g/l):

hydrogen peroxide (in terms of active oxygen)2,0-3,5
silicate or metasilicate sodium (in terms of SiO2)1,8-5,6
soda and/or caustic soda
to total alkalinity4,0-15,0

the solution for whitening contains components in the following ratio (g/l):

hydrogen peroxide (in terms of active oxygen)0,7-1,5
silicate or metasilicate sodium (in terms of SiO2)1.4 to 2.5
soda and/or caustic soda
to total alkalinity3,0-5,0

- final kislovka carried out in an aqueous solution of acetic acid.

The invention provides the following advantages.

1. To increase profitability through efficient use of chemicals, which is achieved with the exception of the pressure rise above the allowable apparatuses AAA by preventing excessive secretion of gaseous products and exclusions thereby reduce the volume of peroxide-based solutions in the reaction zone. The pressure increase is prevented due to:

- choice of the optimal proportions of silicate stabilizers and alkaline agents (silicate-base module)regulating the rate of decomposition of hydrogen peroxide;

- step by step conducting oxidative cooking when adjusting the values of silicate-base module at each stage;

- avoid foaming in the absence of surfactants in p is toxicodynamic solutions.

2. To ensure the high quality of all kinds of flax fibers due to:

- spending for processing fibers optimal quantities of chemical reagents (due to the exclusion of their unsustainable losses);

- the possibility of increasing the specific costs of hydrogen peroxide for the treatment of fibrous masses;

- application of surface-active substances only in the first stage of the technological process, which ensures the complete removal of fiber during subsequent treatments;

- exceptions in the final stages of processing the application of reagents that create a danger message allergenic properties and toxicity of the flax fibers and manufactured based medical materials.

3. To improve the environmental security technology through the use of low concentrations of surfactants in solution (total process of wetting up to 0.5 g/l) and, consequently, their low content in the wastewater sent for treatment.

In addition, the invention provides the following additional benefits:

- the possibility of increasing the concentration of hydrogen peroxide in the solution allows to increase 1.5-1.6 times the weight of the fiber, processed in the apparatus, i.e. to carry out the process when a liquid module 6-6,5; this opens up the prospect of conducting the process at full load apparatus is KD compressed fibrous mass (for example, 700-750 kg instead of 430-450 kg (module 10) in the apparatus of the AAA-601 or DTP-601);

- the possibility of increasing the concentration of hydrogen peroxide in the solution allows you to process (liquid module 10) fiber with a high content of lignin;

- when carrying out processes at low liquid modules reduced specific consumption of coolant (steam) through a significant part of the process at low temperatures.

Flax fiber, bleached by the proposed method meets the requirements of the cellulose fibers used for manufacturing of high quality medical supplies and hygiene products and cosmetics.

Information confirming the possibility of carrying out the invention

As a source of raw materials you can use flax fiber in the form of short fibers, tow, waste scutching, waste wet leptadenia (Iwaki) etc., previously cleared from fires and trash (to a residual content of fires not more than 1.5%) and spongy.

For implementing the method using the following chemicals:

as the mineral acid can be used sulphuric, nitric, acetic, and other acids;

as the wetting agent can be used known anion active and non-ionic compounds with wetting, washing the th, emulsifying ability, low foaming, produced in the form of solutions, pastes, etc. of domestic and foreign manufacturers, for example Evaded, Sulfacid-61, etc.;

sodium silicate Na2SiO3(liquid sodium glass) (GOST 13078-81) - thick liquid yellow or gray without mechanical inclusions visible to the naked eye, containing from 28.5 to 33% of silicon dioxide (SiO2and from 10-12% of sodium oxide (Na2O), the density of 1.36 to 1.50;

metasilicate Na2SiO3· 9 H2O (TU-6-18-161-82) - white or yellow microcrystalline product containing 18.5 - 20.0% silicon dioxide (SiO2and 20-20 .5 of sodium oxide (Na2O); completely soluble in water at room temperature;

sodium hydroxide NaOH (technical caustic soda) (GOST 2263-81) - a thick liquid or solid product produced in the form of flakes, granules, etc.;

soda ash, Na2CO3(sodium carbonate or sodium carbonate) (GOST 10689-73 and 5100-74) is a crystalline powder of white colour; depending on the method of obtaining (from nepheline raw materials - GOST 10689-73 or synthetic - GOST 5100-74) soda ash contains from 91 to 99% sodium carbonate; in the humid air of anhydrous sodium carbonate is converted into hard lumps, however, the water absorption is negligible; the solubility of sodium carbonate (VG 100 g of water)at 20°C - 21,5, at 100°C and 45.5;

hydrogen peroxide (H2O2(GOST 175-81) is a colorless liquid, produced by the form of the solution of the two brands: technical and health with a concentration of 27.5-31.0% of (weight).

The way to implement the sequential operations of chemical processing mechanically cleaned flax fiber, including:

- kislovka fiber for 25-30 minutes at a temperature of 25-30°C with a solution containing (g/l):

sulfuric acid1,5-3,5
the wetting0,2-0,5

- washing water at a temperature of 25-30°C;

- oxidative boiling in a solution containing the following components (g/l):

hydrogen peroxide
(in terms of active oxygen)2,0-3,5
silicate or metasilicate sodium
(in terms of SiO2)1,8-5,6
soda and/or caustic
soda to total alkalinity 4,0-15,0

gradually when the following values silicate-base module:

module of 0.5-0.6 at a temperature of 20-25°C for 10-15 minutes.

module of 0.8-0.9 at 20-25°C for 10-20 minutes.

module 1.0 to 1.1 at 70-75°C for 30-60 minutes and at a temperature of 96-98°C for 30-60 minutes.

module of 0.4-0.5 at a temperature of 96-98°C for 30-60 minutes.

- rinse hot and cold water;

- bleaching for 50-60 minutes at a temperature of 96-98°C in a solution of the following composition (g/l):

hydrogen peroxide
(in terms of active oxygen)0,7-1,5
silicate or metasilicate sodium
(in terms of SiO2)1.4 to 2.5
soda and/or caustic
soda to total alkalinity3,0-5,0

with the rise of temperature within 50-60 minutes;

- wash hot (80-90°C) and warm water (50-60°C);

- final kislovka solution of acetic acid, and 0.5-1.0 g/l at 20-25°C for 20-30 minutes.

- drying.

The analysis quality is about bleached flax was carried out in accordance with GOST 5556-81 and THE 9393-001-04740840-2005 "Wool absorbent surgical flax-containing, sterile and non-sterile WHLS-"IHR".

The compositions of the processing solutions and quality flax fibers obtained under different conditions of chemical treatment, are given in tables 1 and 2. Examples 1, 2 and 5 were obtained using, respectively, a soft linen fiber (contents incrusting substances up to 2%), waste of scratching and wet leptadenia (Iwaki), examples 3 and 4 - gross (content incrusted to 3.25%), example 6 - a very rough flax (content incrusted above 3.5%).

The data of table 2 clearly shows that using the claimed combination and sequence of operations and varying the conditions of their implementation, the invention provides the ability to get bleached fiber with high whiteness 72-76%, capillarity 80-85 mm, the absorption capacity 19-23 g/g fiber, the normalized residual content of chloride, calcium and sulfate salts. While the operations of the fibers in a laboratory apparatus AL-210/1 (manufacturer LLC Tex-Volga, , Kostroma), which provides for the circulation of technological solutions through the compressed fibrous mass, the automatic regulation of temperature and time parameters of the process and the control pressure in the reaction zone, it was confirmed that the inventive method eliminates the excessive release of gaseous products what s the decomposition of hydrogen peroxide and the pressure is maintained at a safe level.

Table 1
The compositions of the processing solutions and conditions of the processes at different stages of chemical treatment of flax fibers
The compositions of the processing solutions and conditions of the processesThe value of the parameters in the examples:
1234567 (method prototype)
12345678
I Kislovka fiber
Concentration (g/l):2,0
acid: sulfuric1.5 3,02.52,0
nitric1.53,5
of wetting: Evade0,20,50,5EM-PO - 0,3
Sulfacid-610,30,40,5
Temperature/time, °C/min25/2525/2525/3025/2530/2525/3060/20
Liquid module*6,010,06,010,0 6,010,020
II Oxidative cooking
Concentration (g/l):
hydrogen peroxide (in terms of active oxygen)2,02,03,02,52,03,52,5 EM-PO - 1,0
Stabilizer: silicate or
metasilicate sodiumcomposition Diurin
(in terms of SiO2)1.83,6/td> 3,63,62,25.60,3
soda and/orcaustic soda - 10.0;
caustic soda
to total alkalinity4,09,0to 12.010,06,015,0General saloon. - 11,0
Temperature/time20/10 (0,6)25/10 (0,6)25/10 (0,5)25/10 (0,5)20/10 (0,6)25/15 (0,5)heating to 95°C
if (M**), °C/min20/10 (0,9) 25/10 (0,8)25/15 (0,8)25/20 (0,8)20/10 (0,9)25/20 (0,8)during 50 min
75/30 (1,1)75/40 (1,0)70/60(1,0)70/50 (1,0)70/30 (1,1)70/60 (1,0)
98/3098/5098/6098/4098/3096/60
98/30 (0,6)98/50 (0,5)98/60 (0,5)98/60 (0,5)98/45 (0,6)96/60 (0,5)95/90
The maximum pressure at 96-98°C***, ATM1,52,32,92,81,53,03,9 at 70°C

2345678
III Bleaching in alkaline solution of hydrogen peroxide
Concentration (g/l):
hydrogen peroxide (in terms of active oxygen)0,71,01,51,2-1,52,25
Stabilizer: silicate or
metasilicate sodium composition Diurin
(in terms of SiO2)1,41,52,32.1-2,50,5
soda and/or-caustic soda is 5.5
caustic soda
to total alkalinity3,03,04,64,25.0
Temperature/time, °C/min98/5097/5096/5098/60-98/6095/90
IV Final kislovka fiber
Concentration (g/l) acetic acid0,50,50,80,61,01,0sulfuric acid - 2,0
Temperature/time, °C/min20/2025/2025/3025/3020/2525/3060/15
* liquid - module - mass ratio of solution to weight of fiber; ** - silicate-base module (SM) equal to the ratio of SiO2/Na2O *** - in used in the experiments the apparatus periodic actions of AL-210/1, reproducing in miniature industrial equipment for liquid processing flax (apparatus AKDN), Pets not pressure more than 3.9 ATM.

Table 2
Qualitative indicators bleached flax fiber
Indices Values for flax fibers, bleached according to examples*:Rate in accordance with
1234567 (method prototype)GOST 5556 for cottonTHE 9393-001-04740840-2005 for flax fibers
Whiteness, %,74727274757343not less than 72not less than 72
Capillarity, mm86858385828035at least 70at least 70
Absorption capacity (g/g fiber192019,519,3 19,519,513at least 19at least 19
Time wetting,3254810300--
Mass fraction of chloride salts, %0.0040.0040.0040.0040.0040.004exceed 0,004no more than 0,004no more than 0,004
sulfate salts, %less than 0.02less than 0.02less than 0.02less than 0.02less than 0.02less than 0.02exceed 0.02not more than 0.02not more than 0.02
calcium salts, %< 0.06 < 0.06< 0.06< 0.06< 0.06< 0.06exceeding 0,06not more than 0,06not more than 0,06
* examples 1, 2 and 5 were obtained when using a soft linen fiber (contents incrusting substances up to 2%), waste of scratching and wet leptadenia, i.e. half white (Iwaki), examples 3 and 4 - gross (content incrusted to 3.25%), example 6 - a very rough flax (content incrusted above 3.5%) [Handbook of chemical processing technologies linen fabrics / Ed. by E.R. Shelkovskoy M: Light industry, 1973. - P.52].

1. Method of bleaching of flax fibre for the manufacture of medical supplies, including kislovka, leaching, oxidative boiling in an alkaline solution comprising hydrogen peroxide and a stabilizer, washing, bleaching, washing and final kislovka, characterized in that the oxidizing boiling is carried out in stages at different values of silicate-base module, first at a temperature of 20-25°C in a module of 0.5-0.6 for 10-15 minutes, then at module 0,8-0,9 within 10-20 minutes, then at module 1,0-1,1 within 30-60 minutes at a temperature of 70-75°C, after which the temperature is ivysaur up to 96-98°C and incubated for 30-60 minutes, the module then reduce to 0.4-0.5 and continue cooking for 30 to 60 minutes, the bleaching is carried out in alkaline solution, containing the same substances as in the solution for oxidation of cooking, kislovka carried out at a temperature of 25-30°C, and washing after kislovka spend once with cold water.

2. The method according to claim 1, characterized in that the solution for oxidation of cooking contains components in the following ratio (g/l):

hydrogen peroxide (in terms of active oxygen)2,0-3,5
silicate or metasilicate sodium (in terms of SiO2)1,8-5,6
soda and/or caustic soda
to total alkalinity4,0-15,0

3. The method according to claim 1, characterized in that the solution for whitening contains components in the following ratio (g/l):

hydrogen peroxide (in terms of active oxygen)0,7-1,5
silicate or metasilicate sodium (in terms of SiO2)1.4 to 2.5
kaltsin the line and/or caustic soda
to total alkalinity3,0-5,0

4. The method according to claim 1, characterized in that final kislovka carried out in an aqueous solution of acetic acid.



 

Same patents:

FIELD: textiles, paper.

SUBSTANCE: method comprises acid treatment, reducing boiling and oxidation treatment with the solution of hydrogen peroxide at a temperature from 95 to 100°C, avivage and washing between the technological operations first with hot and then cold water. The acid treatment is carried out with the preparation which is a composition comprising sulfamic acid with a concentration of 0.5 to 2.0 g/l. The boiling is carried out for 40 to 90 minutes using as a reducing agent the composition containing derivatives based on sulfinic acid with a concentration of 0.5 to 2.5 g/l and the reducing agent with the complexing additives with a concentration of 1.5 to 2.5 g/l.

EFFECT: improving the whiteness level of flax roving.

3 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: disclosed is a stabilising composition containing (A) a polymer of formula , where R1 is hydrogen or C1-12-alkyl, R2-COOM or -CH2COOM; M is hydrogen, an alkali or alkali-earth metal ion, or an ammonium ion or mixture thereof; n, m and k are molar ratios of monomers, where n ranges from 0 to 0.95, m ranges from 0.05 to 0.9 and k ranges from 0 to 0.8, and (n+m+k)=1, and the weight-average molecular weight ranges from 500 to 20 000 000 g/mol; (B) a chelating agent; (C) poly-alpha-hydroxyacrylic acid or alkaline salt thereof, or corresponding polylactone thereof, and (D) possibly a polycarboxylic acid polymer or alkaline salt thereof. The invention also discloses a method of treating fibrous material with said stabilising composition.

EFFECT: disclosed composition has a synergetic stabilising effect compared to existing stabilisers.

28 cl, 5 tbl, 8 ex

FIELD: textile, paper.

SUBSTANCE: cellulose-containing textile material is processed in a bleaching solution, which contains hydrogen peroxide, diarin, which is a mixture of aqueous solutions of sodium salts of phosphorus-containing complexons, carbamide, a penetrating agent EM. Diarin is mixture of aqueous solutions of sodium salts of phosphorus-containing complexons. The penetrating agent EM is a composition based on anion-active and non-ionogenic surfactants. Besides, treatment in the bleaching solution is carried out simultaneously with ultrasonic exposure at the frequency of 25-35 kHz, capacity of 1.5-2.5 kW for 20-30 minutes.

EFFECT: invention makes it possible to considerably reduce power inputs, to increase material quality, to improve process ecological compatibility and to reduce its labour intensiveness.

1 tbl

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

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, 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.

EFFECT: reduced tear load in moist unprocessed roving up to 50-61%; obtainment of thin yarn meeting the requirements for 1 grade in thickness and stability of physical and chemical yarn properties; enhanced yarn strength in 1,2-1,4 times; improved esthetics of woven canvas exterior.

1 tbl, 3 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: 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: 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: process for treatment of textile materials, in particular, whitening of flax fiber for producing of hygroscopic wool used for medicine purposes.

SUBSTANCE: method involves subjecting flax fiber to oxidizing cooking followed by whitening with the use of hydrogen peroxide in the presence of stabilizing preparation based on oxyethylidene diphosphonic acid; after final rinsing, providing brightening processing, preferably with the use of solution containing higher fatty acid based softener used in an amount of 0.5-1.0 g/l. Method is realized in industrial plants with the use of proper equipment and chemical substances available and produced on industrial scale by home enterprises. Said method does not require substantial alterations in chemical processes.

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

2 tbl, 5 ex

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.

EFFECT: reduced loss in strength, felting tendency, and rigidity of textiles.

2 tbl, 6 ex

FIELD: light and fur industry.

SUBSTANCE: invention relates to a composition used for whitening hair cover of fur hides. The composition comprises sodium chloride, hydrogen peroxide, potassium persulfate, the composition based on mineral and organic acid salts - "Antikolor 1" or "Antikolor-2" as an agent for stabilizing pH value, and a mixture of primary saturated alcohols - "Antikolor-3" as a protective additive. The composition provides reducing the negative effect of leather and hair cover of hide. The composition can be used in raw-dye manufacture in treatment of hides with pigmented hair cover, for example, hides of karakul group.

EFFECT: valuable properties of composition.

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.

EFFECT: improved consumer properties of fur skins.

2 tbl

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

SUBSTANCE: method involves subjecting flax fiber to oxidizing cooking followed by whitening with the use of hydrogen peroxide in the presence of stabilizing preparation based on oxyethylidene diphosphonic acid; after final rinsing, providing brightening processing, preferably with the use of solution containing higher fatty acid based softener used in an amount of 0.5-1.0 g/l. Method is realized in industrial plants with the use of proper equipment and chemical substances available and produced on industrial scale by home enterprises. Said method does not require substantial alterations in chemical processes.

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.

EFFECT: reduced tear load in moist unprocessed roving up to 50-61%; obtainment of thin yarn meeting the requirements for 1 grade in thickness and stability of physical and chemical yarn properties; enhanced yarn strength in 1,2-1,4 times; improved esthetics of woven canvas exterior.

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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