RU2265094C1 - Method for whitening of flax fiber for producing of wool - Google Patents

Abstract

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

Description

The invention relates to the textile industry, in particular to chemical technology for processing textile materials, and more particularly to bleaching flax fiber to obtain absorbent cotton for medical purposes.

A known method of bleaching flax fiber in the roving, which consists in the oxidative cooking of the fiber, acidification and intermediate washing with water. Textbook "New in theory and practice of technology for bleaching cotton and linen fabrics." M .: Light industry, 1976, analogue.

The disadvantage of this invention is the facilitated and insufficiently effective effect on the fiber. This is due to the fact that the flax fiber of the roving is subjected to preliminary mechanical and chemical treatment to remove unwanted impurities. In addition, the requirements for fiber quality in the roving are significantly lower in the content of related substances, which are not standardized for this type of product.

A known method of bleaching flax fiber for cotton wool, which consists in preliminary mechanical processing, chemical refinement of the fiber in a caustic soda environment, acidification with sulfuric acid, bleaching with a solution and intermediate washing with water and final machining, RF patent No. 2104358, 1996, the closest analogue .

The disadvantage of this method is the use for bleaching toxic chlorine-containing chemical compounds and the low quality of the resulting product, as well as the complexity of the process.

The closest analogue to the claimed method is a method of producing cotton wool, which consists in the fact that the fiber is subjected to reduction cooking, acidification with sulfuric acid, followed by bleaching with hydrogen peroxide, bleaching is performed with a composition containing hydrogen peroxide, caustic soda, stabilizer and nonionic wetting agent, RF patent No. 2078163.

The disadvantage of this method is the increased energy consumption, since the decoction is performed at a temperature above 100 ° C, that is, at overpressure. Such processing conditions lead to the degreasing of the fiber and, as a consequence, to an increase in its rigidity and electrification, which subsequently affects the process of carding the bleached fiber.

The aim of the invention is to remedy these shortcomings of the closest analogue and to achieve high quality medical cotton wool from flax, including modified fiber, reducing energy costs with a simplified process for its preparation.

The problem is achieved in that the method of bleaching flax fiber to obtain cotton wool includes oxidative cooking in caustic soda, bleaching with an aqueous solution in the following ratio of components, g / l:

Hydrogen peroxide (100%) 2.0-7.0 Caustic Soda (100%) 3.0-8.0 The stabilizer composition Diarin based hydroxyethylidene diphosphonic acid 0.3-0.7 Nonionic wetting agent 0.4-0.1 Softener Tratskan MGF 0.5-2.0

rinsing with hot water at a temperature of 60-70 ° C and trivial treatment, preferably with a solution containing a softener based on fatty acids in an amount of 0.5-1.0 g / l after the final washing.

A comparative analysis of the proposed technical solution and analogues shows that it is not known and does not follow explicitly from the prior art, i.e. is new and has an inventive step.

Further, the invention is illustrated by an example implementation.

The raw material for the production of cotton wool is flax fiber (short, tow-flax waste). Flax fiber is machined, cleaned to a pointlessness of not more than 1.5% by processing on baking and cleaning units in the preparation department.

The resulting intermediate is loaded into the boiler and subjected to acidification at a temperature of 50-60 ° C for 20-30 minutes with an aqueous solution of the composition, g / l:

Sulfuric acid (100%) 1-3 Nonionic wetting agent 0.1-0.3

Next, the fiber is washed with hot water in a boiler at a temperature of 50-70 ° C twice for 15 minutes. Then the fiber is subjected to oxidative cooking, preferably in an aqueous solution of a composition containing, g / l:

Hydrogen peroxide (100%) 3.0-5.0 Caustic Soda (100%) 8.0-10.0 The stabilizer composition Diarin based hydroxyethylidene diphosphonic acid 0.1-0.3 Nonionic type wetting agent 0.5-1.0 for example, EM-ZP wetting agent based on ethoxylated fatty alcohols. Total alkalinity 9.0-11.0

The solution is heated to 95-100 ° C for 45-60 minutes. Cooking at this temperature is carried out for 60-90 minutes.

Next, the fiber is washed with hot water at a temperature of 50-70 ° C twice for 15 minutes. Then the fiber is whitened with a composition containing hydrogen peroxide, sodium hydroxide, a stabilizer based on hydroxyethylidene diphosphonic acid and a nonionic wetting agent based on hydroxyethylated fatty alcohols in the following composition, g / l:

Hydrogen peroxide (100%) 2.0-7.0 Caustic Soda (100%) 3.0-8.0 The stabilizer composition Diarin based hydroxyethylidene diphosphonic acid 0.3-0.7 Nonionic wetting agent 0.3-1.0 Softener Tratskan MGF 0.5-2.0

Heating is carried out to 95-100 ° C for 45-60 minutes. Whitening at this temperature is carried out for 60-90 minutes. Then followed by washing with hot water at a temperature of 60-70 ° C for 15 minutes and acidification with a solution of sulfuric acid 1-3 g / l at a temperature of 25-50 ° C for 15 minutes. Next, the fiber is washed with hot and cold water. In conclusion, an avivazhny treatment is carried out with a solution containing a softener based on higher fatty acids in an amount of 0.5-1.0 g / l.

Examples 2-5 of the implementation of the whitening method according to the claimed invention are shown in table 1.

The quality parameters of flax fiber wool obtained as a result of the method according to examples 2-5 are shown in table 2.

From table 2 it is seen that all the necessary quality parameters of the cotton wool obtained according to the invention exceed the parameters of the prototype, GOST and requirements for hygienic surgical cotton.

The proposed method of bleaching flax fiber can be implemented in an industrial environment using the equipment available for these purposes, does not require a significant change in chemical technology. Chemicals are available and produced on an industrial scale by domestic enterprises.

Claims (2)

1. The method of bleaching flax fiber for cotton wool, including oxidative cooking in a caustic soda environment, followed by bleaching with a solution containing the following components, g / l: hydrogen peroxide (100%) 2.0-7.0 caustic soda (100%) 3.0-8.0 stabilizer - Diarin composition based hydroxyethylidene diphosphonic acid 0.3-0.7 nonionic wetting agent based ethoxylated fatty alcohols 0.3-1.0 softener Trazkan MGF 0.5-2.0 washing with hot water at a temperature of 60-70 ° C and avivazhnoy processing after the final washing. 2. The method according to claim 1, characterized in that the trivial treatment is carried out with a solution containing a softener based on higher fatty acids in an amount of 0.5-1.0 g / l.