SU1758126A1 - Method for preparing mixture - Google Patents

Abstract

SUMMARY OF THE INVENTION: The starch is stirred for 3-5 minutes with water heated to 25-30 ° C. C, in the glue unit. 0.01-0.02% by weight of monochloramine starch is added and heated at a rate of 10-12 ° C. C / min up to 80-85 ° C for gelatinization. At the stage of stabilization of viscosity at a constant temperature of 80-85 ° C. A paste is run for 10–15 min through an acoustic ultrasonic tube connected to the glue tank at an ultrasound frequency of 8-10 kHz in cavitation mode. 3-5 minutes before the end of the ultrasonic treatment, 0.5% by weight of the vegetable oil starch is added. Charge quality: viscosity 26.7-26.8 s, percentage of starch cleavage 97.8-98.0%, dry residue 4.50-4.52%, gluing 4.20-4.23%. Quality of sanding yarn: strength 23.64-23.72 r / chitx, elongation 4.18-4.30%, breakage 0.030-0.031 breaks / m-h. 1 tab. cl

Description

The invention relates to the textile industry, specifically to methods for preparing a composition for smoothing cotton yarn.

There is a known method of preparing starch dressing by mixing the ingredients and hydrodynamic cavitation of the mixture.

The disadvantage of this method is the inadequate splitting of starch, which leads to the additional use of large contents of harmful chemical decomposition agents (caustic soda and chloramine). This, in turn, lengthens and increases the cost of the preparation cycle of dressing.

There is also known a method for preparing starch dressing by mixing the ingredients and repeatedly driving the mixture through acoustic tubes.

The disadvantage of this method is the inadequate splitting of starch, which also requires the use of significant quantities of chemical cleavers, as well as the relatively small intensity of the process of preparing the dressing.

The prototype of the proposed method is the method of preparing the dressing, which includes mixing the starch with water heated to 25-30 ° C, heating the resulting mixture with an intensity of 10-12 ° C / min to 80 ° C85 ° C with simultaneous multiple repetition of processing cycles, in which the mixture is subjected successively in one cycle of low-frequency hydrodynamic cavitation at a frequency of 0.1-0.2 kHz, filtering and high-frequency acoustic cavitation at a frequency of 8-10 kHz, followed by repeating the indicated processing cycle

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mixtures at 80-85 ° C for 10-15 minutes, and for 3-5 minutes before the end of the process, sunflower oil is added to the mixture in an amount of 0.5% by weight of starch.

The advantage of this method is the complete absence of chemical splitting agents, which improves the ecological environment in the weaving industry. However, hydrodynamic cavitation is used for this purpose, which is one of the most energy-intensive methods of the preparation of dressing. In addition, the time of hydrodynamic and acoustic treatment is relatively long, which significantly increases the cost of the preparation of the dressing. Finally, the percentage of starch cleavage is not high enough, which reduces the quality of the prepared dressing.

The purpose of the invention is to increase the efficiency of the process.

The goal is achieved by the fact that in the proposed method of preparation of dressing by mixing starch with water having a temperature of 25-30 ° C. Heating the starch suspension with an intensity of 10-12 ° C / min to 80-85 ° C, ultrasound treatment with a frequency of 8-10 kHz in cavitation mode, stabilization of the viscosity of starch paste at 80-85 ° C for 10-15 minutes with addition of 3-5% of the starch mass, according to the invention, 3-5 minutes before the end of the vegetable oil process, heating the starch suspension start after 3-5 minutes of mixing edge small water while introducing additional monochloramine in an amount of 0.01-0.02% by weight of starch, and sonication carried out only at the stage of stabilizing the viscosity of starch paste at a constant temperature.

The proposed method allows to improve the quality of dressing and processed yarn by increasing the percentage of starch cleavage; reduce the cost of preparation of dressing by 40-60% by eliminating hydrodynamic cavitation and reducing the time of application of ultrasonic treatment.

At the same time, the use of harmful chemical breakers due to small amounts does not complicate the ecology of preparation of dressing.

The method is carried out as follows.

In a glue unit made in the form of a vessel heated by steam, communicating with a closed circulation loop in which a pump and an ultrasound device are connected, which is set to

oscillation frequency of 8-10 kHz, pour water, which is heated to a temperature of 25-30 ° C and turn on the pump. Starch is then loaded into the water and the mixture is pumped through a closed circulation loop with the help of a pump, stirring for 3-5 minutes. Then monochloramine is added to the mixture in an amount of 0.01-0.02% by weight of starch (or 0.0005-0.0010% by weight of the whole mixture) and

0, heating of the mixture with an intensity of 10–12 ° C / min to 80–85 ° C is started. After reaching a temperature of 80–85 ° C, the ultrasonic device is activated.

5 stabilize the viscosity of the dressing at a constant temperature. The viscosity is stabilized by ultrasonic treatment when the mixture is pumped through a circuit for 10-15 minutes, 3-5 minutes before the expiration of which

Oil is added to the mixture, for example, sunflower oil in the amount of 0.5% by weight of starch.

Example 1. For preparing the dressing of the proposed method, the equipment described above was used. This varied the mass content of the ingredients of the sizing composition in the range, wt.%:

Starch4.5-5.0

0 Monochlorinom 0.0005-0.0010

Vegetable oil 0,020-0,025 VodaEstalnoy

For comparison, control formulations of the dressing were prepared with varying mass content of ingredients in the range, wt.%:

Starch4.5-5.0

Vegetable oil 0,020-0,025 VodaEstalnoy

0 Topioca, corn, potato and wheat starch were used as starch; as vegetable oil - sunflower, cottonseed and corn oils.

The table shows the average data on the quality parameters of dressing and yarn, as well as on the characteristic times of preparation technology. The table indicates: fr is the frequency of hydrodynamic cavitation (the latter is absent in the proposed method); fA is the ultrasonic processing frequency; fB is the initial water temperature; m

0 intensity (speed) of heating the mixture; ticc gelatinization temperature of starch and stabilization of the mixture viscosity (final temperature of its heating); hsv is the time of stabilization of the mixture viscosity; TNP - the time of the beginning of the mixing period, in the prototype is absent (from the beginning of mixing until the beginning of heating the mixture); c is the viscosity of the dressing; PPH is the percentage of starch cleavage; WITH - dry residue; P - glue; K, U and 0 - strength, elongation and breakage of the yarn, respectively; gy - the operating time of the hydrodynamic cavitator (in the proposed method is absent); HA - the time of operation of the ultrasonic device.

The deviation of the results from the average data listed in Table 2, with Yu, the change in the composition of the dressing is; , 3; APRK ± 2.0; DSO ± 0.3 DP ± 0.3;

DK ± 4,3; , 2; D0 ± 0.03. As can be seen from the table, the advantage 15 of the proposed method compared to the prototype lies in higher quality indicators of the prepared dressing and processed yarn, in shorter times of operation of the acoustic apparatus, and most importantly, in eliminating the need for hydrodynamic cavitation, one of the most energy-intensive methods of preparation of dressing. The achievement of the latter is explained, apparently, by the joint use of chemical and ultrasonic cleavage of starch. An increase in the content of monochloro in more than 0.001 wt.% Is inexpedient, since it does not lead to a further improvement in quality indicators.

The table shows that the best indicators of yarn quality and dressing are achieved at t0 25-30 ° C; m 10-12 degrees / min; 35 T.KS 80-85 ° C; Gnp 3-5 min; Gsv 10-15 min; fA 8-10kHz.

PRI mme R 2. Preparation of the dressing was carried out according to a known method with the difference that the aqueous suspension of starch is subjected only to ultrasonic treatment. The values of the operational parameters and the results obtained are given in lines 30 and

31 tables. The total preparation time for the dressing was 45 minutes. Vegetable oil was added 4 minutes before the process was completed.

If we compare the effects of using the proposed method (rows 7-8 of the table) with the known (rows 30-31 of the table - 50), we see that the quality of the dressing and yarn is higher, the ultrasonic treatment time is

32 minutes less (13 minutes instead of 45 minutes in the prototype), and the total time of preparation of dressing

23 minutes less (22 minutes instead of 45 minutes), 55

PRI me R 3. Preparation of dressing held:

a) under the conditions of the proposed person, using only the proposed concentration of monochlorine (0.015% by weight of starch), but without ultrasonic treatment with a total cooking time of 70 minutes (row 32 of the table);

b) under the conditions of the proposed method using a known concentration of monochloramine (1.0% by weight of starch), but without ultrasonic treatment, the duration of the process is 50 minutes (line 33 of the table);

c) under the conditions of implementation of the known method using only hydrodynamic processing (without ultrasonic processing) with a total duration of 40 minutes (line 34 of the table);

d) under the conditions of the proposed method, but without using monochloramine with a total process time of 22 minutes (line 35 of the table), the data on which are compared with the example given in line 5 of the table.

From these examples it can be seen that the quality parameters of the dressing and the total time of its preparation with a separate effect on the sterilization of different methods of starch are much worse than in their proposed combination.

Claims (1)

The invention The method of preparation of the dressing by mixing the starch with water having a temperature of 25-30 ° C, heating the starch suspension with an intensity of 10-12 ° C / min to 80-85 ° C, treatment with ultrasound with a frequency of 8-10 kHz in the cavitation mode , stabilization of the viscosity of starch paste at 80-85 ° C for 10-15 minutes and adding 3-5 minutes before the end of the process of vegetable oil with an amount of 0.5% of the mass of starch, about in order to increase the efficiency of the process, the heating of the starch suspension is started after 3-5 minutes mixing starch with water with simultaneous addition of monochloramine in an amount of 0.01-0.02% by weight of starch, and sonication is carried out only at the stage of stabilization of the viscosity of starch paste at a constant temperature. The effect of the composition of the starch charge of the regime parameters of its preparation on the quality of the dressing and the yarn to be processed and on the characteristic times of the technology of preparation of the dressing rlpottomew tables