KR20060024139A - Process of one-sided water repellant finish - Google Patents

Abstract

The present invention relates to a single-sided water-repellent processing method consisting of a water-repellent solution preparation process, an application process, a water-repellent solution drying process and a heat treatment process, by the present invention to impart a water-repellent function to the surface of the knitted fabric, rain water, moisture, etc. from the outside It prevents the infiltration of water and imparts water-proof function, while maintaining the absorption function of woven fabric unique to the back side, absorbs sweat and moisture generated in the body and keeps moisture permeability and air permeability (air permeability) When used, it can provide a comfortable one-sided water repellent foam.

Description

Process of One-sided water repellant finish}             

1 is a bird's eye view of the one-side water repellent processing method of the present invention.

2 is a photograph of the water repellent performance of the water-repellent surface of the fabric of Example 1 processed by the present invention.

3 is a photograph of absorption performance on the back side of the fabric of Example 1 processed by the present invention.

The present invention relates to a one-sided water repellent processing method for preparing a water-repellent solution using only a water repellent agent, water and a thickener, and to apply this solution to a knitted fabric by the KNIFE COATING method. The present invention relates to a method of simultaneously providing moisture absorption and absorption performance and water repellency performance unique to fabrics.

Water repellent is a process that applies a hydrophobic material to the fibers that make up the knit fabric to prevent water from penetrating when water is dropped on the surface of the knit fabric. It is the processing which gives the property opposite to the wettability of water of synthetic fiber, such as acrylic and polyester.

  In general, the one-sided water-repellent processing method of the knitted fabric has a spray method, a gravure coating, a printing method, etc., but both sides of the water-repellent treatment during processing, there is a problem that the moisture absorption and absorption inherent in the fabric is lost. In the case of a thick fabric, that is, a fabric having a thickness of 0.8 mm or more, single-sided water repellent processing is possible to a certain extent, but in a thin fabric less than 0.8 mm, single-sided water repellent processing was very difficult.

In the case of the thin knitted fabric, the thickness of the thin knitted fabric is almost thin and absorbent. Therefore, when the water repellent is treated, the water repellent is quickly penetrated and diffused to the opposite side of the knitted fabric, so that both sides are water repellent. There was a difficulty in curing the water repellent by heat treatment while controlling. In addition, the penetration and diffusion rates vary depending on the type of material, the structure of the fabric, and the pretreatment conditions. Therefore, when processing, it was difficult to set the conditions in consideration of the material properties.

In addition, in the coating method, there is a method of water repellent treatment using a water-soluble urethane binder and a water repellent, but this has a problem of inhibiting breathability by forming a urethane film. As such, the conventional processing method has a technical problem in order to impart both opposite properties of water absorption and water repellency to both sides of the thin fabric.

Therefore, the present invention is water-repellent treatment on both sides during the water-repellent process as described above to prevent the end of the hygroscopic property of the fabric is prevented or eliminated, water-repellent treatment on only one side of the woven fabric can maintain the absorbency of the fabric unique The technical task is to provide one-sided water repellent.

In order to solve the above technical problem, the present inventors use only a water repellent agent to adjust the thickness of the knife, the treatment section, and the temperature setting of the chamber to control the penetration and diffusion into the opposite side of the surface coated when the knife is coated on the fabric. By doing so, it was found that the water-repellent performance can be given only to one side of the knitted fabric to complete the present invention.

Therefore, according to the present invention, a process of preparing a water-repellent solution having a viscosity of 15,000 to 20,000 cps by stirring while mixing 10 to 30% by weight of a fluorine-based or teflon water-repellent, 67 to 89% by weight of water, and 1 to 3% by weight of a naphtha-based thickener; Applying the water repellent solution while supplying a knitted fabric preheated to 50 to 60 ° C. under a coating knife; The upper auxiliary air nozzle is formed in the lower part of the knitted fabric from the coating knife to the inlet of the chamber, and the internal temperature of the air nozzle formed in pairs in the upper and lower directions of the knitted fabric in the chamber is 160 ° C to 170 ° C and the total length is 10m. Supplying a knitted fabric coated with the water repellent solution to a chamber to dry the applied water repellent solution; A one-side water repellent processing method is provided, comprising the step of heat-treating the coated knitted fabric at 160 ° C. to 170 ° C. for 20 to 25 seconds in a tenter.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The single-sided water repellent processing method of the present invention comprises a water repellent preparation preparation step, an application step, a water repellent solution drying step, and a heat treatment step. After the dyeing process is finished, a water-repellent solution is applied to the surface of the dried, heat-treated knitted fabric, dried and then heat-treated in a tenter is a single-sided water-repellent processing of the present invention.

First, the process of preparing a water repellent liquid is as follows.

10-30% by weight of a fluorine-based or teflon water-repellent, 67-89% by weight of water, and 1-3% by weight of a naphtha-based thickener are mixed with stirring to form a water-repellent solution having a viscosity of 15,000-20,000 cps. Prepare 67 ~ 89% by weight, add 10 ~ 30% by weight of water repellent, mix with stirring at 1200rpm or more in a high speed mixer, and slowly add 1 ~ 3% by weight of naphtha thickener, and the viscosity of the mixture is 15,000 ~ 20,000cps. And finish stirring.

The single-sided water repellent process of the present invention is particularly preferable for processing a thin woven fabric having a thickness of less than 0.8 mm. Since the water repellent solution should penetrate and diffuse only on one side of the fabric, it is very important to control the viscosity of the water repellent solution. If the viscosity is less than 15,000 cps, the water repellent solution can penetrate to the back side of the knitted fabric, so that one-sided water repellent is difficult. If the viscosity exceeds 20,000 cps, diffusion of the water repellent fluid into the knitted fabric is difficult and the feel of the final product is difficult. There is a risk of stiffness.

In the present invention, the prepared water-repellent solution is coated on the knitted fabric by the knife coating method as shown in Figure 1, while supplying the knitted fabric (1) preheated to 50 ~ 60 ℃ under the coating knife (4) 3) is applied (3) at 50 g to 60 g / m 2.

 It is desirable to preheat (2) the woven fabric to 50 to 60 ° C. to give a uniform coating action. In the present invention, as another condition for facilitating the penetration and diffusion of the water-repellent solution, it is preferable to use a knife having a thickness of about 1.0 to 1.5 mm. When the water-repellent agent is coated with the coating knife, the water-repellent solution applied to the knitted fabric can be evenly spread on the knitted fabric with a uniform thickness.

 The knitted fabric passing through the coating knife is supplied to the chamber 6 in which the air nozzles 7 are formed in pairs through the upper auxiliary air nozzle 5 installed between the coating knife and the chamber inlet, and dried. The distance between the knife and the chamber inlet is preferably 1.0 to 1.5m, and the water-repellent fluid is appropriately penetrated and dried while passing through the upper auxiliary air nozzle 5 located below the knitted fabric at the interval. The chamber is formed by a pair of air nozzles in the upper and lower directions with respect to the knitted fabric so that the air 9 is sprayed to the coated surface as well as the back surface of the knitted fabric to dry the water repellent solution. It is preferable that the interval between the knitted fabric passing through the nozzle and the chamber is 120 to 150 mm. If the thickness is less than 120 mm, the water-repellent fluid may flow under the influence of air flow, and if it exceeds 150 mm, sufficient drying Can't expect the effect. The air velocity in the air nozzle is preferably about 5m / sec.

The chamber has a total length of 10 m and a temperature inside the chamber after coating is preferably 160 to 170 ° C. for drying the water-repellent solution.

Since the water repellent performance of the knitted fabric is insufficient even after the coating process as described above, if the water-repellent solution is cured by heat treatment at 160-170 ° C. for about 20 seconds in the tenter 8, a single-sided water repellent is formed.

The following examples are given as non-limiting examples of the present invention, single-sided water repellent.

Example 1

10% by weight of Teflon water repellent (Oleopoball CO and Oleopobol SLA-01. Duponic Acid). After mixing at a rate of 88% by weight of water, add a thickener (RD 500. Hyupjin Chemical Co., Ltd.) at a rate of 2% by weight, stir with a high speed mixer and thicken to a viscosity of 15,000 cps to prepare a water-repellent solution. After weaving, pretreating, dyeing, drying and heat-treating cotton fabrics (200 g / yd, fabric thickness: 0.25 mm), and preheating the fabrics at 50 ° C., the prepared water-repellent water was prepared at a knife thickness of 1.2 mm and a speed of 20 M / min. After the processing liquid was applied to the fabric at 55 g / m 2, the upper and lower air nozzles were passed through a chamber arranged inside the chamber at a temperature of 160 ° C., and then again at 170 ° C. and 40 m / in a tenter. Heat treatment at a speed of min was performed for single-sided water repellent.

As a result of measuring the water repellency of the single-sided water-repellent fabric by KS K0590 (spray method), the water repellency was 90 (see Fig. 2), but the absorption performance of the back side was the same as that of the product before the single-side water repellent process (see Fig. 3). ) And the water repellency after 10 washes was 85.

Example 2

20% by weight of the Teflon water repellent of Example 1, 78% by weight of water, followed by thickening in a high speed mixer with the addition of 2% by weight of the thickener of Example 1 to prepare a viscosity of about 15,000 CPS, followed by nylon / polyester mixed double weave The span fabric was dyed, processed and dried, and then coated in the same manner as in Example 1, and then heat-treated at 40 m / min at a temperature of 170 ° C. in a tenter. As a result of measuring the water repellency and water absorption of the single-sided water-repellent fabric, the initial water repellency was 95, and the water repellency after washing 10 times was 90. Soon afterwards, absorbents were formed so that a material bureau with a diameter of 1.5 cm was formed. In addition, the water resistance was measured by the KS K0591 low water pressure method, and the water pressure was 200 mmH 2 O.

Therefore, according to the present invention, the one-sided water repellent process is continuously applied to the thin knitted fabric of less than 0.8 mm to provide the water repellent function to prevent the penetration of rainwater, moisture, etc. from the outside, and to provide the living waterproof function. It has the advantage of excellent comfort when used as a garment by maintaining the absorption function of the knit fabric, absorbing sweat, moisture generated in the body, and maintaining moisture permeability and breathability. Even when applied to the quick-drying fibers, there is a useful effect that can maintain the inherent properties of the fiber as it is, but can also provide a waterproof function.

Claims (3)

In knitted fabric water repellent, 10 to 30% by weight of a fluorine-based or teflon water-repellent, 67 to 89% by weight of water and 1 to 3% by weight of a naphtha-based thickener while stirring to form a water-repellent solution having a viscosity of 15,000 to 20,000 cps; Applying the water repellent solution while supplying a knitted fabric preheated to 50 to 60 ° C. under a coating knife; The upper auxiliary air nozzle is formed in the lower part of the knitted fabric from the coating knife to the inlet of the chamber, and the internal temperature of the air nozzle formed in pairs in the upper and lower directions of the knitted fabric in the chamber is 160 ° C to 170 ° C and the total length is 10m. Supplying a knitted fabric coated with the water repellent solution to a chamber to dry the applied water repellent solution; And a step of heat-treating the coated knitted fabric at 160 ° C. to 170 ° C. for 20 to 25 seconds in a tenter. 2. The one-side water repellent processing method according to claim 1, wherein an interval between the air nozzle of the chamber and the supplied knitted fabric is 120 to 150 mm. The method of claim 1, wherein a distance between the coating knife and the chamber inlet is 1.0 to 1.5 m.

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