Method for peroxide whitening and alkaline cooking of cotton cloth

FIELD: textile industry, in particular, peroxide whitening and alkaline cooking processes used in dyeing of cotton cloths.

SUBSTANCE: method involves dividing reservoir of material washing machine into two chambers by means of partition having fine filtering properties for fine filtering of water; introducing electrodes into said chambers; filling chambers with water, with running water being directed through chamber having positive electrode and called anode chamber, and water comprising, g/l: hydrogen peroxide 20-25, sodium silicate 15-20, surfactant 2-3, being directed through chamber having negative electrode and called cathode chamber; charging common salt into cathode chamber in an amount of 10-20 g/l; supplying electrodes with voltage of 5-35 V; charging cloths into cathode chamber for whitening and alkaline cooking; impregnating cloths in reservoir of material-washing machine at temperature of 85-95 C with aqueous solution of salts of indicated composition; steaming at temperature of 100 C; washing with hot and cold water.

EFFECT: reduced processing time, decreased costs of whitening and cooking processes, and improved safety of operating conditions.

1 dwg

 

The invention relates to textile production, to a method of bleaching and otwarte, namely peroxide bleaching and alkaline otwarte cotton fabric during dyeing.

Known separate ways blanching and otwarte, i.e. in two stages. For otwarte usually use the cooking liquid containing sodium hydroxide, sodium bisulfite, sodium silicate, surface-active substances (SAS). Zaparivajut soaked in the cooking liquid fabric in an atmosphere of saturated water vapor at a temperature of 100-105°within hours [see Balashov SO, Bulusheva N.E., Novoradovskaya T.S., garden SF Short course of chemical technology of fibrous materials. - M: Light and food industry, 1984, - p.29-33]. As whiteners used mainly oxidants: hypochlorites of sodium and calcium, sodium chlorite, hydrogen peroxide, less often nagkalat and drugs on the basis of dichloroisocyanurates acid. Bleaching with hydrogen peroxide is as follows. The fabric after otwarte impregnated at a temperature of 90°With solution containing (g/l) hydrogen peroxide 3-5, sodium silicate 8-10, caustic soda 3-5, wetting 1-2, then the fabric is placed in Zapadnye machine, where was incubated for 60 min at a temperature of 100°C, and washed [see Balashov SO, Bulusheva N.E., Novoradovskaya T.S., garden SF Short course of chemical technology in the fibrous material. - M: Light and food industries, 1984. - p.36].

The disadvantage of the way of analog is the long duration of treatment, large energy, material, total cost, low labour productivity.

The closest technical solution to the same destination to the claimed method, the set of essential characteristics is a method of bleaching and otwarte, in particular, peroxide bleaching and alkaline otwarte, namely, that rassledovanie, the washed fabric is impregnated at a temperature of 90°With solution containing (g/l): hydrogen peroxide 20-25, caustic soda 5-7, sodium silicate 15-20, surfactants 2-3, the evaporation at a temperature of 100°within hours, subsequent flushing hot and cold water [see Balashov SO, Bulusheva N.E., T.S. Novoradovskaya, Garden SF Short course of chemical technology of fibrous materials. - M: Light and food industry, 1984, - p.37-40], taken as a prototype.

The disadvantage of the prototype method is the long duration and high cost of the production process, high degree of risk due to the necessity of working with concentrated caustic soda.

The technical result - the reduction of the time, cheaper process of blanching and otwarte, improvement of conditions of safety.

This technical result is achieved in that capacity m is the material-washing machine is divided into two chambers by a partition, have properties filter, water purification, cells enter electrodes, pour water, and through the camera with a positive electrode, called the anode chamber, let the flowing water, as in a cell with a negative electrode, called the cathode chamber, pour water solution containing (g/l): hydrogen peroxide 20-25, sodium silicate 15-20, surfactants 2-3, the same cathode load table salt in the amount of 10-20 g/l, serves on the electrode voltage 5-35 In load to the cathode fabric for bleaching and alkaline otwarte, the impregnation of the fabric in the vessel material and washing machines is carried out at a temperature of 85-95°With, then zaparivajut fabric at a temperature of 100-105°within hours, washed with hot and cold water.

The invention is illustrated in the drawing.

The capacity of 1 material and the washing machine is partitioned into two chambers by a partition 2, with the properties of the fine filter water in both chambers are arranged along opposite sides of the bath electrodes 3, the camera 4 to the negative electrode, called the cathode chamber, a large volume is intended for introduction into it of an aqueous solution of hydrogen peroxide, sodium silicate, surfactant, for introduction into it of salt, for impregnating a cotton fabric with a solution, which is obtained after application to the ele is tradam voltage value 5-35, camera 5 with the positive electrode is designed for running water.

Specified in the formula limits the values of the processing parameters selected for the following reasons. The number loaded into the cathode chamber of salt 10-30 g/l is necessary and sufficient to obtain out of it when using the proposed method caustic soda within 5-7 g/l specified in the formula of a minimum number of one g/l quartz powder, zeolite, amphoteric materials, or a mixture thereof is necessary and sufficient for impregnation process when applying voltage to the electrodes the size of 35, and the maximum number of powders 30 g/l is necessary and sufficient to ensure the process when applying voltage to the electrodes the size of the 5th Century

Example. Tub 1 for peroxide bleaching and alkaline otwarte of compound wall thickness of 10 mm is divided into two chambers in the ratio of their volumes of 1:30 by a partition 2 from a sheet of polyethylene of a thickness of 3 mm with through-holes with a diameter of 0.0005 m with a step of 0.005 m in both cameras around the opposite side of the tub injected graphite electrodes 3 and the camera 4 to the negative electrode, called the cathode chamber, designed for peroxide bleaching and alkaline otwarte, and the camera 5 with a positive electrode, called the anode chamber, designed for running water, hydrochloric acid is formed in the cathode is the camera after download it from salt in the amount of 20 g/l, and submit to the electrodes, the electrical potential difference value 20, in the same cathode chamber and injected powder montmorillonite in the amount of 15 g/l, load cotton fabric in the cathode chamber 4, maintain the fibers at a temperature of 80°C for 20 min, unload the fibers from the bath, wring out the cloth until 90% of caustic soda solution, washed with hot water.

Using the proposed method and device for its implementation allows more than two times to increase efficiency, reduce the time of carbonization, to reduce energy and total costs; the absence of the proposed device, the storage, piping, valves for supplying a metered quantity of concentrated sulfuric acid in the bath for carbonization significantly improves safety during implementation of the method on this device.

The way the peroxide bleaching and alkaline otwarte cotton fabric, comprising the impregnation of the fabric in the vessel material and the washing machine at a temperature of 85-95°With a water solution containing (g/l): hydrogen peroxide 20-25, sodium silicate 15-20, surfactants 2-3, steaming at a temperature of 100°followed by rinsing with hot and cold water, characterized in that the capacity of the material and the washing machine is divided into two chambers by a partition having properties filter, water purification, cells injected electron is childbirth, pour the water, and through the camera with a positive electrode, called the anode chamber, let the flowing water, as in a cell with a negative electrode, called the cathode chamber, pour water, hydrogen peroxide, sodium silicate, surfactants of the above amounts, in the same cathode load table salt in the amount of 10-20 g/l, serves on the electrode voltage 5-35 In load to the cathode fabric for bleaching and alkaline otwarcie.



 

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31 cl, 1 tbl, 1 ex

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