KR102460309B1 - Method for manufacturing swellable composite yarn using twisted yarn and swellable composite yarn manufactured thereby - Google Patents

Abstract

The present invention relates to a method for manufacturing a swellable composite yarn using a twisted yarn, and the swellable composite yarn manufactured thereby. The method for manufacturing a swellable composite yarn using a twisted yarn, and the swellable composite yarn manufactured thereby can improve tensile strength, workability and cost competitiveness while maintaining moisture absorption ability.

Description

Method for manufacturing inflated composite yarn using false twisted yarn and inflated composite yarn manufactured thereby

The present invention relates to a method for manufacturing a blown composite yarn using false twisted yarn and to a blown composite yarn produced thereby, and more specifically, to a blown composite yarn capable of improving tensile strength, workability and cost competitiveness while maintaining moisture absorption ability. It relates to a manufacturing method and the puffed composite yarn produced thereby.

In the case of power cables, high-voltage cables, communication cables, or optical communication cables, water in the pipeline or underground penetrates and spreads to the line along the fine pores of the cable. In the case of an optical communication cable, this deterioration does not occur, but it flows into the terminal in the middle of the cable and causes signal failure or signal damage. Recently, as the demand for high-voltage cables for seawater, submarine, and nuclear power has increased, technology that can effectively waterproof or block high-voltage cables and communication cables or optical communication cables is required due to the nature of the environment where they can be exposed to water. .

In order to achieve this, a swellable yarn is usually used. The swellable yarn is made of a material with swellability and is wound in the air gap of the communication cable or the tube of the optical communication cable above and below the conductor or neutral wire of the power cable. As it is inflated, the inflated swelling pressure can prevent water penetration. Therefore, the rate of moisture absorption of the puffed yarn is most important, that is, how quickly and how much water can be absorbed at the beginning, and whether the strength of the puffing powder remains stable after water absorption.

Such an inflated yarn can be manufactured by manufacturing a coating agent containing a swellable material and coating it on a polyester yarn, etc. A technology that can improve tensile strength, workability, cost competitiveness, etc. while maintaining high moisture absorption capacity of the inflated yarn This is a necessary situation.

Domestic Patent Publication No. 2003-0035409

Accordingly, the problem to be solved by the present invention is to provide a method for manufacturing a puffed composite yarn capable of improving tensile strength, workability and cost competitiveness while maintaining moisture absorption ability, and a puffed composite yarn manufactured thereby.

The problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, there is provided a method for manufacturing an inflated composite yarn according to an embodiment of the present invention, comprising the steps of: (a) false twisting by applying heat to a filament yarn; (b) processing by spraying compressed air on the twisted filament yarn for every predetermined length; (c) coating the superabsorbent polymer composition on the processed filament yarn; and (d) winding the coated filament yarn with a covering yarn together with the auxiliary false twisted yarn, wherein the auxiliary false twisted yarn and the covering yarn are each manufactured in the same manner as in step (a).

Step (a) may be a step of passing the filament yarn through a heater heated to 160-195 ℃.

The filament yarn may be a polyester-based filament yarn.

The superabsorbent polymer composition may include a superabsorbent polymer; And it may include at least one selected from the group consisting of polyvinyl alcohol, benzaldehyde, nitric acid, caustic soda, lauryl ether, an aqueous methanol solution and an aqueous ethanol solution.

Inflated composite yarn according to an embodiment of the present invention for solving the above other problems may be manufactured by the above method.

In addition, one or more of the following (1) to (4) may be satisfied.

(1) Tensile strength (kg/yarn): 15 or more

(2) Elongation (%): 20 or more

(3) Absorption rate (ml/g·min): 50 or more

(4) Absorption capacity (ml/g·10min): 55 or more

Details of other embodiments are included in the detailed description.

The manufacturing method of the puffed composite yarn according to the embodiments of the present invention can easily coat the yarn with the super absorbent polymer composition, and the manufactured puffed composite yarn has the advantage of improving tensile strength while maintaining moisture absorption ability. .

In addition, it is possible to reduce the cost of raw materials such as super absorbent polymer compared to the same yarn thickness (denier), thereby improving cost competitiveness.

Effects according to the embodiments of the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 shows a manufacturing process of a swollen composite yarn according to an embodiment of the present invention.
2 is a photograph showing the shape of a filament yarn twisted according to an embodiment of the present invention.
3 is a schematic view showing the structure of the inflated composite yarn according to an embodiment of the present invention.
4 is a graph showing the tensile strength according to the temperature of the heater of the samples prepared according to an experimental example of the present invention.
5 is a photograph observing the stability of the superabsorbent polymer composition prepared according to an experimental example of the present invention.
6 is an SEM image of super absorbent polymers according to an experimental example of the present invention.
7 is a graph showing the results of measuring the absorption rates of superabsorbent polymers according to an experimental example of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become apparent with reference to the embodiments described below in detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, 'and/or' includes each and every combination of one or more of the mentioned items. The singular also includes the plural, unless the phrase specifically states otherwise. As used herein, 'comprises' and/or 'comprising' does not exclude the presence or addition of one or more other elements in addition to the stated elements. Numerical ranges indicated using '-' or 'to' indicate a numerical range including the values before and after, respectively, as the lower and upper limits, respectively, unless otherwise stated. 'About' or 'approximately' means a value or numerical range within 20% of the value or numerical range recited thereafter.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

And in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 shows a manufacturing process of a swollen composite yarn according to an embodiment of the present invention. Referring to FIG. 1 , the inflated composite yarn of the present invention may be manufactured through the following steps.

Steps of twisting filament yarn

The filament yarn (1) is twisted by passing it through a heated heater (2). The heated heater 2 may be composed of an upper plate 2a and a lower plate 2b, and the filament yarn 1 passes therebetween and may be combusted by receiving heat.

When the filament yarn (1) is passed through the heater (2), twisting occurs in the yarn as shown in FIG. The modified filament yarn 3 has a wider surface area and increased arbitrariness of the yarn pattern, so that the absorption and adhesion of the coating solution such as the superabsorbent polymer composition can be increased. In addition, the twisted shape of the yarn may cause entanglement with other yarns, and thus the tensile strength may be improved as the fixing force is increased.

The temperature of the heater 2 may be 160-195 °C, specifically 165-190 °C or 170-185 °C. If the temperature of the heater 2 is lower than the above range, the degree of deformation may be low, and the absorption power or tensile strength of the coating solution may be insignificant. If it is higher than the above range, the yarn may be damaged or workability may be deteriorated due to excessive deformation.

The temperature range may be the temperature of the heater 2 itself, or the temperature at which the filament yarn 1 is substantially heated. The temperatures of the upper plate 2a and the lower plate 2b may be the same as or different from each other, and the average temperature of the upper plate 2a and the lower plate 2b may be set to be included in the above temperature range.

The speed of passing the filament yarn 1 through the heater may be 80-150 m/min. If the speed is higher than the above range, the thermal deformation of the yarn may not be sufficiently made, and if it is lower than the above range, the thermal deformation of the yarn may be excessively generated. In some embodiments, the speed of passing through the heater can be selected according to the denier of the filament yarn 1 , the thicker it is, the closer to 80 m/min, and the thinner it is, the closer to 150 m/min. speed can be set. However, the present invention is not limited thereto.

As the filament yarn 1, a polyester-based filament yarn may be used, but is not limited thereto.

The thickness (denier) of the filament yarn 1 may be 100-10,000 d, but the embodiment of the present invention is not limited thereto.

Step of blowing compressed air to the twisted filament yarn

It can be further processed by blowing compressed air to the deformed filament yarn 3 by twisting it into a bulky form.

When compressed air is sprayed on the twisted filament yarn 3 using the compressed air injection nozzle 4 or the like, the portion in contact with the compressed air is densely deformed. When compressed air is sprayed on the twisted filament yarn 3 for every predetermined length, the densely deformed portion may appear at a predetermined period as shown in FIG. 2(b). The twisted filament yarn 3 is passed through the coating nozzle or roll to be coated with the superabsorbent polymer composition later, but it may be difficult to pass into the coating nozzle or roll because of the twisted and bulky shape. However, if the yarn is densely deformed for every predetermined length with compressed air as described above, the yarn can be maintained within a certain volume, so that it can be much easier to pass through the nozzle or roll for coating.

In a specific embodiment, the twisted filament yarn 3 passing through the heater 2 may be passed through the nozzle 4 for spraying compressed air at a predetermined cycle. The speed of passing through the compressed air injection nozzle 4 may be substantially equal to the speed of passing through the heater 2 , for example, 80-150 m/min.

The period or length of spraying the compressed air is not limited, but may be a fixed length (period) of about 10-100 cm or a non-fixed length (period).

The temperature of the compressed air may be room temperature of 15-30 ℃, but is not limited thereto.

The pressure of the compressed air may be 0.5-5 kgf/cm ² , preferably 1.5-4 kgf/cm ² , but is not limited thereto.

Coating the superabsorbent polymer composition on the processed filament yarn

The filament yarn processed through false twisting and compressed air injection is passed through a nozzle or roll for coating and coated with a superabsorbent polymer composition.

The twisted form of the filament yarn improves absorption and adhesion to the superabsorbent polymer composition to prevent the coating liquid from sliding when it passes through the coating nozzle or roll, and the densely deformed pattern through compressed air makes the filament yarn Make it easy to pass through the coating nozzle or roll.

In one embodiment of the present invention, the superabsorbent polymer composition comprises a superabsorbent polymer; And it may include at least one selected from the group consisting of polyvinyl alcohol, benzaldehyde, nitric acid, caustic soda, lauryl ether, an aqueous methanol solution and an aqueous ethanol solution.

Specifically, the superabsorbent polymer composition comprises 6-15 parts by weight of polyvinyl alcohol, 0.5-2 parts by weight of benzaldehyde, 0.15-0.35 parts by weight of nitric acid, 0.15-0.35 parts by weight of caustic soda, 15-30 parts by weight of superabsorbent polymer, and D. It may include 1-2.5 parts by weight of uryl ether and 25-55 parts by weight of an aqueous methanol or ethanol solution. In addition, 0.05-0.6 parts by weight of a heat-resistant reinforcing agent may be further included.

When the superabsorbent polymer composition 'comprising' the above components in the above content, it may mean that the components included in the prepared composition are present in the above contents, as well as in the case of manufacturing using the components of the above contents. . That is, it may include a case in which some components are changed into other products by reaction during the manufacturing process.

The methanol or aqueous ethanol solution may be a solution in which methanol or ethanol and water are mixed in a weight ratio of 5:5 to 6:4. When methanol or ethanol is used in an amount of less than 50 wt %, that is, less than 5: 5, the stability and workability of the composition may be deteriorated. When methanol or ethanol is used in excess of 60 wt%, that is, more than 6:4, the difference in the effect compared to the cost increase is insignificant, and the safety of workers may be adversely affected due to toxicity.

The superabsorbent polymer may satisfy one or more of the following (1) to (3).

(1) particle size distribution: 80 wt% or more of particles having a particle size of 75 μm or less and 15 wt% or less of particles having a particle size of 75-150 μm or less; preferably at least 85 wt% of particles having a particle size of 75 μm or less and 12 wt% or less of particles having a particle size of 75-150 μm; More preferably, 90 wt% or more of particles having a particle size of 75 μm or less and 10 wt% or less of particles having a particle size of 75-150 μm or less

(2) Instantaneous absorption rate: 5 seconds or less, preferably 4 seconds or less

(3) absorption rate: 8 mm or more in 30 seconds and 13 mm or more in 1 minute; preferably at least 9 mm at 30 seconds and at least 14 mm at 1 minute

When the amount of benzaldehyde exceeds 2 parts by weight, the absorption rate of the inflated tape in which the adhesive composition is used may decrease.

The superabsorbent polymer swells when it comes into contact with water due to the osmotic pressure phenomenon. At this time, when heat is applied to the swollen superabsorbent polymer, the chain chain is broken and changes like water again and the swelling pressure is lost. Therefore, the heat-resistant reinforcing agent is required in order to preserve the swollen form to maintain the form of the gel.

The composition may further include 0.5-2 parts by weight of polyvinyl acetate. Polyvinyl acetate may function as a secondary polymer of the adhesive composition. However, polyvinyl acetate is not an essential component and can be omitted, and in some embodiments, when polyvinyl acetate is omitted, it may exhibit superior properties such as adhesion and water absorption.

Meanwhile, the composition may not include Aerosil and glass bubbles. Aerosil and glass bubble are usually used for viscosity reinforcement, deposition prevention, flow reinforcement, etc., but since the composition shows stable viscosity, flowability, workability, etc. without aerosil and glass bubble, Aerosil and glass bubble are omitted. It can reduce the cost and simplify the process. In particular, the composition can adjust the viscosity to an appropriate range by using an aqueous solution of methanol or ethanol in a specific mixing ratio.

In some embodiments, the composition may further include an anticorrosion agent, but embodiments of the present invention are not limited thereto. The anti-corrosion agent is directly wrapped around the in.out part of the conductor and the neutral wire based on the neutral wire in the structure of the power cable. When water penetrates, it easily corrodes due to the nature of copper and can be added to prevent or delay it.

A method of preparing a superabsorbent polymer composition according to an embodiment of the present invention comprises the steps of: (a) introducing an aqueous solution of methanol or ethanol into a reactor and raising the temperature to 80-90 °C; (b) adding 6-15 parts by weight of polyvinyl alcohol to the reactor and dissolving it in the methanol or ethanol aqueous solution for 3-5 hours; (c) mixing and reacting 0.5-2 parts by weight of benzaldehyde and 0.15-0.35 parts by weight of nitric acid into the reactor; (d) terminating the reaction by adding 0.15-0.35 parts by weight of caustic soda to the reactor; (e) mixing the reaction-completed composition with an aqueous solution of methanol or ethanol, 15-30 parts by weight of a super absorbent polymer, 1-2.5 parts by weight of lauryl ether, and 0.05-0.6 parts by weight of a heat-resistant reinforcing agent to prepare a superabsorbent polymer composition includes steps.

In this case, a total of 25-55 parts by weight of the methanol or ethanol aqueous solution may be used. The amount of methanol or ethanol aqueous solution in step (a) and the methanol or ethanol aqueous solution in step (e) may be 2-8:5.

In some embodiments, step (c) may be a low-temperature reaction performed after quenching to 10-15° C., and may be performed for 20 hours, but is not limited thereto.

In some embodiments, the method may further include measuring viscosity, solid content, pH, water resistance, etc. by taking a sample of the composition prepared in step (d), but is not limited thereto.

The superabsorbent polymer composition as described above may satisfy one or more of the following properties (1) to (2).

(1) Adhesive force: 1.6 N/cm or more, preferably 1.7 N/cm or more

(2) Absorption rate: 80% or more in 1 minute, preferably 85% or more in 1 minute

Winding the coated false twisted filament yarn together with the auxiliary false twisted yarn as a covering yarn

The coated false twisted filament yarn is wound with a covering yarn together with the auxiliary false twisted yarn to prepare the inflated composite yarn of the present invention. 3 is a schematic diagram showing the structure of the inflated composite yarn according to an embodiment of the present invention, in which the false twisted filament yarn 10 coated with the superabsorbent polymer composition 20 and the single or multiple auxiliary false twisted yarn 31 are A structure wound together with a covering yarn 32 is shown.

The above-mentioned twisted filament yarn is used as the auxiliary false twisted yarn and the covering yarn. The auxiliary false twisted yarn and the covering yarn are twisted as in the above-described step of the filament yarn, and the above-described step of processing through compressed air jetting may not be performed.

By winding the coated false twisted filament yarn with the covering yarn together with the similarly twisted auxiliary false twisted yarn, the tensile strength can be improved by entanglement, etc. Savings can be expected.

The auxiliary false twisted yarn and the covering yarn may also use a polyester-based filament yarn, and the thickness (denier) may be 100-10,000 d, but is not limited thereto. In particular, the covering yarn may have a thickness of 300 d or less, and even if the thickness of the covering yarn exceeds 300 d, the improvement effect such as tensile strength may be insignificant, so using a yarn of 300 d or less may be cost effective.

The winding amount of the covering yarn is not limited, but for example, 1.1-5 m of covering yarn per 1 m of coated false twist filament yarn may be used.

The inflated composite yarn according to an embodiment of the present invention manufactured by the method as described above may satisfy one or more of the following (1) to (4), preferably two or more, more preferably three or more.

(1) Tensile strength (kg/yarn): 15 or more, preferably 17 or more, more preferably 19 or more

(2) Elongation (%): 20 or more, preferably 23 or more, more preferably 26 or more

(3) Absorption rate (ml/g·min): 50 or more, preferably 55 or more, more preferably 60 or more

(4) Absorption capacity (ml/g·10 min): 55 or more, preferably 60 or more, more preferably 65 or more

Hereinafter, the present invention will be described through experimental examples, but it is obvious that the effects of the present invention are not limited by the following experimental examples.

Preparation Example 1: Preparation of the puffed composite yarn of the present invention

Example 1

A 50 wt% aqueous methanol solution was put into the reactor, the temperature was slowly raised to 82-84 ° C., and 10 g of polyvinyl alcohol was added and dissolved. Then, 1.3 g of benzaldehyde and 0.3 g of nitric acid were added to the reactor, and the mixture was mixed and reacted. Then, 0.2 g of caustic soda was added to terminate the reaction. A superabsorbent polymer composition was prepared by mixing the prepared composition with a 50 wt% aqueous solution of methanol, 27 g of a super absorbent polymer, 1.8 g of lauryl ether, and 0.1 g of a heat-resistant reinforcing agent.

A bulky false twisted yarn was prepared by passing a polyester filament yarn at a speed of about 80-150 m/min between the upper plate and the lower plate of the heater heated to about 160-180°C. Some of the manufactured false-twisted yarns were passed through a nozzle that periodically sprays room temperature compressed air to manufacture processed false-twisted yarns. The processed false twisted yarn was coated with the superabsorbent polymer composition while passing it through the coating nozzle. A blown composite yarn was prepared by winding the coated processed false-twist yarn and single or multiple strands of false-twist yarn together with another false twist yarn.

Comparative Example 1

The coated processed false-twisted yarn prepared in Example 1 was used as Comparative Example 1.

Comparative Example 2

A superabsorbent polymer composition was prepared in the same manner as in Example 1, except that the non-processed false-twisted yarn was coated instead of coated on the processed false-twisted yarn.

Comparative Example 3

A superabsorbent polymer composition was prepared in the same manner as in Example 1, except that the non-twisted yarn was coated instead of the processed false-twisted yarn.

Comparative Example 4

It was prepared in the same manner as in Comparative Example 3, except that the false-twisted yarn used for winding was changed to a non-twisted yarn.

Comparative Example 5

It was prepared in the same manner as in Example 1, except that single or multiple-stranded false-twisted yarns were not used.

Comparative Example 6

All false-twisted yarns and processed false-twisted yarns were prepared in the same manner as in Example 1, except that non-twisted yarns were changed.

Experimental Example 1: Evaluation of the properties of the inflated composite yarn

For the inflated composite yarns of Examples and Comparative Examples prepared in Preparation Example 1, yarn thickness, tensile strength, elongation, absorption speed, and absorption capacity were measured in the following manner. was measured.

- Yarn Thickness: Calculates the sum of the deniers of the yarns used.

- Tensile strength and elongation: Measure the load and elongation distance at the point of breakage while tensioning the composite yarn sample using dedicated equipment

- Absorption rate and absorption capacity

1) Unit: ml/g

2) Measuring equipment: electronic scale (precision: 0.001 g), mesh (500 μm)

3) Specimen: 1 m of sample 4 EA

4) Test method: After measuring the weight of the mesh (W1), place the sample on the mesh and measure the weight (W2). After immersing the mesh in a 500 ml beaker for 1 minute / 10 minutes, take it out and dehydrate naturally for 1 minute. After dehydration, measure the weight (W3).

* Absorption rate, absorption amount = W3-W1 / W2-W1

5) Display of test results: The average value of the measured values of each specimen is displayed to the first decimal place.

division Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Yarn thickness (denier, d) 9,000 9,000 9,000 9,000 9,000 9,000 9,000 Tensile strength (kg/yarn) 20 17 20 17 18 15 6 Elongation (%) 27 26 26 23 24 19 10 Absorption rate (ml/g min) 65 70 30 32 32 38 30 Absorption capacity (ml/g·10min) 70 70 34 35 34 42 30 Workability ◎ ◎ △ ○ ○ ○ ○ ◎: Excellent, ○: Average, △: Bad

As shown in Table 1, in Example 1, compared with Comparative Examples using yarns of the same thickness, physical properties such as tensile strength and elongation were improved, but there was no decrease in absorption capacity such as absorption rate and absorption capacity, and excellent workability did. However, in Comparative Example 2, in which the superabsorbent polymer composition was coated on unprocessed false twisted yarn, it was difficult to pass the superabsorbent polymer composition through the coating nozzle due to the bulky nature of the unprocessed false twisted yarn. In Comparative Example 3, in which the resin composition was coated on the untwisted yarn, the superabsorbent polymer composition was not properly fixed to the untwisted yarn, causing a slipping phenomenon and lowering the absorption capacity.

In addition, in the case of Comparative Example 4 in which the untwisted yarn was used for winding, the workability was lowered due to the weak fixing force between the yarns, and the physical properties and absorption capacity were somewhat inferior. This decreased and the workability during winding was deteriorated. In Comparative Example 6 in which false twisted yarns and processed false twisted yarns were not used, properties deteriorated in almost all areas.

Preparation Example 2: Preparation of inflated composite yarns under various conditions

Inflated composite yarns were prepared in the same manner as in Preparation Example 1, but several samples were prepared by varying the heater temperature as shown in Table 2 below.

division Temperature (℃) Example 2-1 80 Example 2-2 100 Example 2-3 120 Example 2-4 140 Example 2-5 160 Example 2-6 180 Example 2-7 195 Examples 2-8 220 Examples 2-9 240 Example 2-10 260

Experimental Example 2: Evaluation of physical properties according to the twisting temperature of the inflated composite yarn

The tensile strength of the samples prepared in Preparation Example 2 was measured in the same manner as in Experimental Example 1, and workability was evaluated. Measurement and evaluation results are shown in Table 3 below. 4 is a graph showing the tensile strength of the prepared samples according to the temperature of the heater.

division Tensile strength (kg/yarn) Workability Example 2-1 15 X Example 2-2 16.5 X Example 2-3 17 X Example 2-4 18 ○ Example 2-5 20 ◎ Example 2-6 20 ◎ Example 2-7 21 ◎ Examples 2-8 18 △ Examples 2-9 - X Example 2-10 - X ◎: Best, ○: Upper, △: Middle, X: Lower

As shown in Table 3 and FIG. 4, the tensile strength of the prepared inflated composite yarn tends to generally improve as the heater or the false twisting temperature increases. The tensile strength at ℃ was at least 18 kg/yarn, and the workability was good, so it was the best. However, when the temperature is too low, the workability is significantly reduced, on the contrary, when it exceeds 195 ° C, the tensile strength is slightly lowered, and from 240 ° C, the deformation and durability of the yarn are severe, making it difficult to manufacture composite yarns and measure the tensile strength.

Preparation Example 3 and Experimental Example 3: Preparation of inflated composite yarns with yarns of various thicknesses

Inflated composite yarn was prepared in the same manner as in Preparation Example 1, but several samples were prepared by varying the thickness of the yarn as shown in Table 4 below.

Secondary false twist (d) coated false-twist yarn (d) False twisted yarn for winding (d) Total (d) Cross-sectional area (㎟) 300 550 100 950 0.24 600 1,100 100 1,800 1.04 600 3,600 300 4,500 3.5 900 5,400 300 6,600 3.89 3,300 5,400 300 9,000 5.46 - 18,000 300 18,300 13.85

As shown in Table 4, inflated composite yarns can be manufactured with yarns of various thicknesses, and as the thickness of the yarns used increases, the degree of increase in the final cross-sectional area tends to increase.

Preparation Example 4: Preparation of various superabsorbent polymer compositions

A superabsorbent polymer composition was prepared in the same manner as in Preparation Example 1, but various samples were prepared by varying the content of the components as shown in Table 5 below.

Ingredients (g) Example 3 Example 4 Example 5 Comparative Example 7 Comparative Example 8 polyvinyl alcohol 10 10 10 8 10 polyvinyl acetate - - - 0.8 - aldehyde 1.3 1.8 2 0.8 2.5 nitric acid 0.3 0.26 0.3 0.2 0.3 caustic soda 0.2 0.24 0.3 0.2 0.3 super absorbent resin 27 27 27 27 27 lauryl ether 1.8 2.1 2.1 1.6 2.2 heat-resistance 0.1 0.3 0.3 0.1 0.3 aqueous methanol solution 59.3 58.3 58 61.3 57.8 pH 7.4 7.4 7.6 7.2 7.5 Viscosity (cps) 2,600-3,200 3,200-3,800 3,500-4,200 2,200-2,800 3,800-4,600

Experimental Example 4: Characterization of the super absorbent polymer composition

In order to confirm the characteristics of the superabsorbent polymer composition prepared in Preparation Example 4, adhesion, water resistance, water absorption, and workability were measured and evaluated.

Adhesion is measured by coating a superabsorbent polymer composition on a nonwoven fabric to prepare a waterproof tape (a thin film layer of cover is attached to measure the adhesive strength), and 3 pieces with a width of 30 mm and a length of 300 mm are collected and dried in a desiccator for at least 24 hours. Then, attach the base side of the sample to the measurement auxiliary plate (stainless steel sheet: thickness 1.5-2.0 mm, width 50 mm, length 120 mm) with double-sided tape and do not attach it to the measurement auxiliary plate of the sample. The cover thin film layer of about 200 mm was peeled off. The measurement auxiliary plate was fixed to the lower check of the tensile tester and the thin film layer was fixed to the upper check, and the average value of three pieces was calculated through a 180 degree peel test at a saddle speed of 300 mm/min.

For water resistance, the degree of agglomeration is tested by dropping the superabsorbent polymer composition with respect to water at a constant weight, and then a certain ratio of superabsorbent polymer is added to 10 g of the adhesive composition, left for 24 hours, and then the particle size of the superabsorbent polymer is measured to determine the particle size. The degree of change was tested.

For water absorption, prepare a sample with a diameter of 79.5 mm, prepared in the same way as the water resistance test, and put it in a measuring cup with the absorption side facing up. Before placing the measuring ram, cover it with about 15 g/m ² of non-woven fabric, place the measuring ram on the sample, contact the measuring device with the ram, check that the scale is in the 0 (Zero) position, and then put the temperature 20 in the measuring cup. After adding 125 ml of distilled water at ±1 ℃, a stop watch was operated and the absorption height was measured by checking the position change of the ram. The absorption rate is calculated by converting the measured absorption height into 100 fractions. 125 ml of distilled water is sufficient until the end of the measurement, but can be added if necessary.

The workability was evaluated for the ease of work required to manufacture the waterproof tape by comprehensively considering the viscosity, hardness, and physical properties of the superabsorbent polymer composition.

The results of measuring and evaluating the properties of the superabsorbent polymer composition are shown in Table 6 below.

unit Example 3 Example 4 Example 5 Comparative Example 7 Comparative Example 8 adhesion N/cm 1.7 1.76 1.81 1.65 1.8 water resistance - △ ◎ ◎ △ ◎ absorption rate %/30sec 48 62 58 45 55 %/1min 75 90 87 69 81 %/2min 92 100 98 82 95 %/3min 100 100 100 96 100 Workability - ◎ ◎ ○ △ ○

◎: Excellent, ○: Good, △: Normal As shown in Table 6 above, Comparative Example 7 using polyvinyl acetate and Comparative Example 8 using 2.5 parts by weight of aldehyde had relatively good adhesion, water resistance, water absorption and/or workability. It can be seen that it has fallen In addition, in the case of Examples 3 and 4, since the characteristics were particularly excellent, the characteristics were compared with other products, and the results were shown in Table 7 below.

unit Example 3 Example 4 Comparative Example 9 Comparative Example 10 Comparative Example 11 unit weight g/m ² 80 80 80 80 125 adhesion N/cm 1.76 1.81 1.68 1.53 1.45 water resistance - ◎ ◎ ◎ ○ ○ absorption rate %/30sec 62 58 56 52 50 %/1min 90 87 79 75 74 %/2min 100 98 99 95 92 %/3min 100 100 100 100 100 Workability - ◎ ○ ○ ◎ △

◎: Excellent, ○: Good, △: Normal In Table 7, Comparative Examples 9 and 10 are adhesive products using a super absorbent polymer made by a domestic company, and Comparative Example 11 is an adhesive product using a super absorbent polymer made by a Chinese company. As shown in Table 7, the adhesive composition of the present invention has relatively excellent properties such as adhesion, water resistance, and workability, and in particular, it can be seen that the initial water absorption rate (30sec, 1min) is significantly superior to other products.

Experimental Example 5: Evaluation of stability and workability of aqueous methanol solution

In order to evaluate the stability and workability according to the concentration of the aqueous methanol solution, the superabsorbent polymer used in the present invention and the super absorbent polymer of a domestic competitor were mixed with 40 wt% methanol aqueous solution (methanol:water = 4:6) and 50 wt% methanol, respectively. An adhesive composition was prepared as in Preparation Example by mixing an aqueous solution (methanol:water = 5:5) and a 60 wt% aqueous methanol solution (methanol:water = 6:4). The results of visually determining the stability of the prepared adhesive composition were shown in Table 8 and FIG. 5 below.

methanol: water Early 1 hour later after 3 hours after 7 hours after 17 hours Example
(a) 4:6 stability Instability Instability Instability Instability 5:5 stability stability stability stability stability 6:4 stability stability stability stability stability domestic third party
(b) 4:6 stability Instability Instability Instability Instability 5:5 stability stability stability stability stability 6:4 stability stability stability stability stability

As shown in Table 8 and FIG. 5, the aqueous methanol solution is stable when the methanol ratio is 5:5 and 6:4, and when the methanol ratio is 4:6, the dissolved state of the components is unstable, so workability and physical properties may deteriorate. it can be seen that there is

Experimental Example 6: Comparison of absorption rates of super absorbent polymers

The absorption rate of the superabsorbent polymer used in the superabsorbent polymer composition of the present invention was compared with that of other superabsorbent polymers. The initial absorption rate of the superabsorbent polymer is an important characteristic that determines the function and performance of the waterproof (or swelling, water-proof) tape.

The superabsorbent polymer was compared with the superabsorbent polymer of a domestic company and the superabsorbent polymer of a Chinese company of Comparative Example used in Experimental Example 4 above. 6 is an SEM image of the superabsorbent polymer (a) used in the present invention, the superabsorbent polymer of a domestic competitor (b), and the superabsorbent polymer of a Chinese company (c). As shown in FIG. 6 , it can be seen that the superabsorbent polymer (a) of the present invention has a smaller average particle diameter than other superabsorbent polymers (b and c) and has a constant shape close to a spherical shape.

The test method for each characteristic was as follows.

- Apparent specific gravity: After filling a 120 ml superabsorbent polymer sample into a funnel, quickly open the volleyball of the funnel and let the sample fall into a 100 ml specific gravity cup. After leveling the sample protruding from the top of the specific gravity cup with a flat ruler, weigh the specific gravity cup and the sample. Calculate the apparent specific gravity with the following formula.

Apparent specific gravity (g/ml) = weight of sample minus weight of pycnometer / volume of pycnometer (100 ml)

- Instantaneous absorption rate (Vortex method): Put 50 ml of 25 ℃ pure water and a Magnetic Stirring bar (8 x 38 mm) together in a 100 ml beaker and place it in the center of the Magnetic Stirrer. Set the speed of the magnetic stirrer to 5, put 1 g of superabsorbent polymer sample into the beaker, and operate the stop watch at the same time. As the viscosity of the superabsorbent polymer sample increases, the magnetic stirring bar stops and the stop watch stops at the same time. At this time, the operation time of the stop watch shall be the instantaneous absorption speed (seconds).

- Absorption rate (absorption power by elapsed time): Put 0.2 g of a superabsorbent polymer sample on the inner bottom (area 50 cm ² ) of the absorbency measuring cup and spread evenly over the entire area except for about 0.5 cm of the bottom edge of the measuring cup. Cover 1 sheet of non-woven fabric (about 15 g/m ² ) so that the dispersed sample is completely covered. Place RAM (93 g/60 hole) on the non-woven fabric, pour 125 ml of distilled water at 20 °C, and operate the timer at the same time. Read the four absorbed heights as quickly as possible for each required elapsed time (select among 30 seconds, 1 minute, 2 minutes, 3 minutes, 6 minutes, and 10 minutes). If distilled water is insufficient during measurement, replenish it. Calculate the average value of the absorption height for each time period to the first decimal place, and use it as the absorption power for the elapsed time period (unit: mm). RAM weight: 93±1 g, 83±1 g (when using a 10 g steel ruler)

- Sieve Analysis: Stack the standard mesh with a large mesh No. on top of the container in turn. 35 Mesh Put 100 g of superabsorbent polymer into a standard mesh and close the lid. Put it on a sieve and shake it for 15 minutes. Weigh the superabsorbent polymer separated by standard mesh sieve. Weigh the superabsorbent polymer separated by mesh size. Calculate the particle size distribution (wt%) for each mesh according to the formula below.

Particle size distribution by mesh (wt%) = (separated superabsorbent polymer (g) / 100 g) x 100

Tables 9 and 7 below are measurements of various properties including absorption rates of superabsorbent polymers.

Example Domestic 1 Domestic 2 made in china Apparent specific gravity (g/ml) 0.86 0.68 0.56 0.82 Instantaneous absorption rate (sec) 3.00 12.00 10.00 5.90 Particle size (wt%) > 500 μm 0 0 0 0 ～ 250 ㎛ 0 2.8 0.3 3.8 ~ 180 μm 0.06 48.3 15.3 10.2 ~ 150 μm 0.18 23.6 14.2 12.3 ~ 125 μm 0.89 17.6 17.3 17.8 ~ 106 μm 5.27 5.2 23.7 11.4 ~ 75 μm 38.95 1.8 16.2 29.4 < 75 μm 54.65 0.7 13 15.1 initial absorption rate
(mm) 30 seconds 10 6.3 8 8.3 1 minute 16 10.8 11 12.8 end absorption rate
(mm) 2 minutes 19.8 13.8 13 15.2 3 minutes 21.5 15.3 13 18 6 minutes 22.8 16.3 13 18 10 minutes 22.8 16.3 13 18

As shown in Table 9 and Figure 7, the superabsorbent polymer used in the present invention has superior instantaneous absorption rate, initial absorption rate and end absorption rate than other superabsorbent polymers, has a smaller average particle size, and has an apparent specific gravity. It can be seen that higher In general, the larger the particle size, the higher the absorption height of the superabsorbent polymer, but the superabsorbent polymer of the present invention has superior absorption rate and absorption height compared to other superabsorbent polymers despite the relatively small average particle size, which is the distribution of particle size and shape of the particles. , it is thought to be a difference according to the uniformity of shape and apparent specific gravity.

This difference in the absorption rate of the superabsorbent polymer can be considered to be reflected in the difference in absorption capacity between the respective compositions as shown in Experimental Example 4.

In the above, the embodiment of the present invention has been mainly described, but this is only an example and does not limit the present invention. It will be appreciated that various modifications and applications not exemplified above are possible. For example, each component specifically shown in the embodiment of the present invention may be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (6)

(a) false twisting by passing the filament yarn through a heater heated to 160-195 °C;
(b) processing by spraying compressed air on the twisted filament yarn for every predetermined length;
(c) preparing a coated filament yarn by coating the superabsorbent polymer composition on the processed filament yarn; and
(d) using the coated filament yarn and a separate auxiliary false twisted yarn as screening, and winding the coated filament yarn and the auxiliary false twisted yarn together with a separate covering yarn,
The auxiliary false twist yarn and the covering yarn, each of which separate filament yarns have undergone the same steps as in step (a).
Method for manufacturing a puffed composite yarn. delete The method of claim 1,
The filament yarn is a polyester-based filament yarn
Method for manufacturing a puffed composite yarn. The method of claim 1,
The superabsorbent polymer composition,
super absorbent resin; and
Polyvinyl alcohol, benzaldehyde, nitric acid, caustic soda, lauryl ether, containing at least one selected from the group consisting of aqueous methanol and ethanol solutions
Method for manufacturing a puffed composite yarn. Claims 1, 3, 4 prepared by the method of any one of claims
Puffed composite yarn. 6. The method of claim 5,
At least one of the following (1) to (4) is satisfied
Puffed composite yarn.
(1) Tensile strength (kg/yarn): 15 or more
(2) Elongation (%): 20 or more
(3) Absorption rate (ml/g·min): 50 or more
(4) Absorption capacity (ml/g·10min): 55 or more

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