KR102202649B1 - Method for manufacturing knitted suede and knitted suede manufactured therefrom - Google Patents

Abstract

The present invention relates to a method of manufacturing knitted suede and a knitted suede manufactured therefrom, and more particularly, in suede used for automobile interior parts, when manufacturing the suede, without impregnation treatment in a separate oily polyurethane solution 2 The present invention relates to a method for manufacturing eco-friendly and economical knitted suede that can realize both sensitivity and surface properties equivalent to that of high-end suede only by coating with a liquid coating solution, and a knitted suede manufactured therefrom.

Description

Method for manufacturing knitted suede and knitted suede manufactured therefrom {Method for manufacturing knitted suede and knitted suede manufactured therefrom}

The present invention relates to a method of manufacturing knitted suede and a knitted suede manufactured therefrom, and more particularly, in suede used for automobile interior parts, when manufacturing the suede, without impregnation treatment in a separate oily polyurethane solution 2 The present invention relates to a method for manufacturing eco-friendly and economical knitted suede that can realize both sensitivity and surface properties equivalent to that of high-end suede only by coating with a liquid coating solution, and a knitted suede manufactured therefrom.

The skin material that forms the surface of automobile interior parts is a part that the occupant visually checks and has physical contact continuously, so it plays an important function in terms of design.

Suede has been widely used for such a skin material for luxurious sensitivity.

As an example, there may be mentioned a method of manufacturing suede using a non-woven fabric. Suede manufactured by the above manufacturing method is a high-quality suede, and has a disadvantage that it is limitedly used only for high-end vehicle models due to the high cost of raw materials.

On the other hand, in general, as disclosed in Korean Patent Laid-Open Patent No. 10-2005-0061936, the economical suede manufacturing method is oil-based polyurethane (Polyurethane) to give a soft feel and a feeling of filling like suede of natural leather after weaving into a fabric. PU) solution has been impregnated.

The oily polyurethane solution uses dimethylformamide (DMF) as an organic solvent, and even if the oily polyurethane solution is impregnated with the woven fabric, and after solidification, dimethylformamide is removed through washing and drying processes. Since dimethylformamide remains in the suede, it is not environmentally friendly. In addition, for the surface properties and appearance, the suede has to be additionally coated with a surface treatment agent having a viscosity of 400-500 cps at 25° C., which is not economical.

KR 10-2005-0061936 (Published: 2005.06.23)

The present invention was conceived to solve the above-described problems, and it is possible to realize both sensitivity and surface properties equal to that of high-grade suede only by coating the knitted fabric with a two-component coating solution without impregnation treatment with an oil-based polyurethane solution. Its purpose is to provide an eco-friendly and economical method for manufacturing knitted suede.

In addition, an object of the present invention is to provide a knitted suede that satisfies the physical properties required as suede used for automobile interior parts and has excellent sensibility, such as a soft touch and a feeling of filling.

In order to achieve the above object, the present invention

(a) forming a covering yarn;

(b) forming a knitted fabric by knitting the covering yarn;

(c) a reduction step of putting the knitted fabric in an alkaline solution so that only the island component of the sea-island microfiber remains;

(d) first buffing the reduced knitted fabric of step (c) with sandpaper;

(e) dyeing the knitted fabric of step (d);

(f) second buffing the knitted fabric of step (e) with sandpaper to organize the appearance;

(g) coating the knitted fabric of step (f) with a two-component coating solution having a viscosity of 100-250 cps at 25° C.; It relates to a method for manufacturing knitted suede comprising a.

In addition, the present invention

It relates to a knitted suede manufactured by the above knitted suede manufacturing method.

Knitted suede manufacturing method of the present invention can implement the impregnation effect only by coating it with a two-component coating solution containing aqueous polyurethane without impregnation treatment in a separate oil-based polyurethane solution, so that dimethylformamide is not left, so it is eco-friendly and high-end It is economical because it can realize both the sensitivity and surface properties equivalent to that of suede.

In addition, the knitted suede of the present invention satisfies the physical properties required as suede used for automobile interior parts, and has excellent sensibility such as soft touch and filling.

Fabric manufacturing methods can be divided into fabrics and knitted fabrics.

In the fabric, two yarns are entangled in the horizontal and vertical directions to form a fabric, and the yarn in the longitudinal direction, that is, the warp yarn, and the yarn in the transverse direction, that is, the weft yarn, are intertwined. The fabric can be divided into plain weave, twill weave, and juja weave depending on the manufacturing method, but the fabric has a disadvantage of deteriorating workability when attached to automobile interior parts due to its strong structure but not elastic.

Unlike a fabric, the knitted fabric is woven by continuous loops with one thread and has good elasticity, and can be divided into circular knitting and warp knitting according to a manufacturing method.

The circular knitting is to form a fabric by yarns are rapidly threaded in the direction of the weft, and the warp knitting is to form a fabric by yarns are suddenly threaded in the warp direction.

The present invention relates to a method for manufacturing knitted suede and a knitted suede manufactured therefrom.

Specifically, the present invention

(a) forming a covering yarn;

(b) forming a knitted fabric by knitting the covering yarn;

(c) a reduction step of putting the knitted fabric in an alkaline solution so that only the island component of the sea-island microfiber remains;

(d) first buffing the reduced knitted fabric of step (c) with sandpaper;

(e) dyeing the knitted fabric of step (d);

(f) second buffing the knitted fabric of step (e) with sandpaper to organize the appearance;

(g) coating the knitted fabric of step (f) with a two-component coating solution having a viscosity of 100-250 cps at 25° C.; It relates to a method for manufacturing knitted suede comprising a.

Hereinafter, each step will be described in detail.

(a) forming step of covering yarn

In the present invention, the covering yarn of step (a) is examined; And it is defined as a yarn made of sea-island microfibers surrounding the examination.

The screening is a polyester-based high shrinkage yarn having a single yarn fineness (C) of 1-5 denier or 1-3 denier. If it is less than the above range, the elasticity decreases, and if it exceeds the above range, fairness decreases in post-processing such as a buffing process after weaving into a knitted fabric, and sensitivity decreases, so it may be denier within the above range.

The island-in-the-sea microfiber is, in other words, also called a split-type microfiber, that is, a sea-island composite obtained by batch-spinning a combination of two or more types of resins, which are sea components and island components, which have significantly different dissolution properties for alkali. It may be prepared by adding fibers to an alkaline solution to elute the component and to achieve microfine filament by leaving only the island component.

As a specific example of the sea-island microfiber of the present invention, a sea-island type composite obtained by batch-spinning a combination of two or more resins in which the sea component is a copolymerized polyester of isophthalate and polyalkylene glycol, and the island component is nylon 6 It can be a fiber.

Or as another example of the sea-island microfiber, a sea-island type composite fiber obtained by batch-spinning a combination of two or more resins in which the sea component is a copolymerized polyester of isophthalate and polyalkylene glycol, and the island component is polyethylene terephthalate Can be

Alternatively, as another example of the sea-island microfiber, a sea-island composite fiber obtained by batch spinning a combination of two or more resins in which the sea component is a copolymerized polyester of isophthalate and polyalkylene glycol, and the island component is polyethylene Can be

The kind of island-in-the-sea microfiber described above is only an example, and the island-in-sea type microfiber used in the present invention is not limited thereto.

In addition, the single yarn fineness after the reduction of the sea-island microfiber may be 0.01-0.5 denier or 0.01-0.3 denier. If it is less than the above range, it is not economical because a large number of twists are required to secure the desired texture, and if it exceeds the above range, buffing processing is not easy and a soft touch and filling feeling cannot be obtained, so it may be denier within the above range.

In addition, the covering yarn of the present invention may satisfy Equation 1 below.

-Equation 1-

3≤ [(A/100) X (B)]/[C] ≤80

Here, A is the number of twists of the sea-island microfibers surrounding 1 meter of the screening, B is the number of filaments after weight loss of the sea-island microfibers, and C is the single yarn fineness of the screening.

The reason why the present invention is limited to the covering yarn that satisfies the conditions of Equation 1 is that the use of a covering yarn made of sea-island microfibres that satisfies the conditions of Equation 1 and wraps the examination as suede used for automobile interior parts This is because suede can be formed that satisfies the required physical properties and has excellent sensibility, such as a soft touch and a feeling of filling, and in particular, the A, B and C have a very important influence in determining the physical properties and sensibility.

The value of Formula 1 may be 3-80, or 10-80. If it is less than the above range, sensitivity such as soft touch and filling will be deteriorated, and if it exceeds the above range, the elongation and strength required as suede used for automobile interior parts cannot be satisfied, so workability is reduced. I can be satisfied.

More specifically, the number of twists (A) of the island-in-the-sea microfiber surrounding the examination may be 300-500 times per 1 meter of the examination, or 350-500 times. If it is less than the above range, the soft touch and feeling of filling are deteriorated, and if it exceeds the above range, the elongation and strength required as suede used for automobile interior parts are not satisfied, so workability is poor, so the number of twists within the above range (A ).

The number of filaments (B) after weight loss of the island-in-the-sea microfiber may be 5-16 split yarns or 8-16 split yarns. If it is less than the above range, the soft touch and filling feeling deteriorate, and if it exceeds the above range, it does not satisfy the elongation and strength required as suede used for automobile interior parts, so workability is poor, so the number of filaments within the above range (B ).

In addition, the step (a) may be to supply the screening and sea-island microfiber surrounding the screening to the interlace to form a covering yarn by interlacing air with air pressure of 1-5kg/cm ² , or 1.5-4kg/cm ² . have. If it is less than the above range, the number of twists (A) of the island-in-the-sea microfiber is too small to reduce the soft touch and feeling of filling, and if it exceeds the above range, the number of twists (A) of the island-in-the-sea microfiber is too large to reduce the elongation. Air pressure can entangle air

(b) knitting formation step

The step (b) is a step of forming a knitted fabric by knitting the covering yarn manufactured through step (a). The knitted fabric may be a circular knitted fabric manufactured by being threaded in a weft direction, or a warp knitted fabric manufactured by threading in an oblique direction.

Specifically, the knitted fabric of step (b) may have a weight of 250-290g/yd, and a thickness of 0.2-0.8mm. When the weight of the knitted fabric is less than the above range, the moldability decreases and wrinkles increase, and when the weight of the knitted fabric exceeds the above range, it is too heavy and the elongation decreases, so that the weight may be within the above range.

In addition, when the thickness is less than the above range, the strength is too weak, and when the thickness exceeds the above range, workability is deteriorated during part molding.

(c) Alkali reduction step

In the step (c), the sea component of sea-island microfiber is eluted by putting the knitted fabric in an alkali solution, leaving only the filaments of the island component, and liquid caustic soda having a concentration of 0.5-3% or 0.5-2% with the alkali solution You can use If it is less than the above range, the reduction may not be appropriate, and if it exceeds the above range, the reduction may be excessively reduced, resulting in a decrease in overall quality, and thus the concentration within the above range may be obtained.

In addition, in the step (c), the treatment conditions at 85-95° C. may be treated for about 15 to 40 minutes, so that a fine suede surface is generated.

In addition, the reduction rate in step (c) may be 15-35%, or 20-30%. The weight loss rate is a value derived from (weight of the knitted fabric before weight loss-the weight of the knitted fabric after weight loss) X 100/(the weight of the knitted fabric before weight loss).If the weight loss rate is less than the above range, the microfiber effect of sea-island microfibers according to the weight loss If it is not expressed properly and exceeds the above range, it may have a reduction rate within the above range because it causes poor appearance and a decrease in the strength of suede due to a decrease in shape stability due to excessive weight loss.

In addition, after the weight of the knitted fabric in step (c), the weight ratio between the screening in the covering yarn and the sea-island microfiber may be 15:85-30:70. If the weight ratio of the examination is less than the above range, the weight of the island-in-the-sea microfiber is relatively increased and the sensitivity may be good, but the workability is not good because the elongation and strength required as suede used for automobile interior parts are not satisfied. If it exceeds the range, since the weight of the island-in-the-sea microfiber is relatively reduced and the sensitivity is lowered, the weight ratio within the above range may be obtained.

(d) 1st buffing step

The step (d) is a step of buffing the knitted fabric weight loss-treated through step (c) with sandpaper so that the dye penetrates well during subsequent dyeing operations.

As a specific example, the step (d) may be a method of starting the buffing with #100 sandpaper and ending with finer #180 sandpaper, or may be weakly treated with #180 sandpaper.

(e) Knit dyeing step

The step (e) is a step of dyeing the knitted fabric buffed through the step (d) to obtain a desired color of suede.

Specifically, step (e) may be a step of dyeing using a dispersion dye at 100-150°C or 110-140°C. If the temperature is less than the above temperature, the disperse dye does not penetrate well into the fiber, so that the dyeing efficiency decreases. If the temperature is exceeded, the dye is decomposed and the dyeing efficiency decreases, so that it is possible to dye at a temperature within the above range.

(f) 2nd buffing step

In the step (f), the dyed knitted fabric is subjected to secondary buffing with sandpaper to arrange the appearance of suede.

As a specific example, the step (f) may be a method of starting the buffing with #150 sandpaper and ending with finer #320 sandpaper, or may be weakly treated with #220 sandpaper.

(g) Knit coating step

In the step (g), the knitted fabric second buffed through step (f) is coated with a two-component coating solution so that the two-component coating solution is impregnated into the knitted fabric, thereby realizing excellent sensitivity, reinforcement of surface properties and appearance of the knitted fabric. Step.

The two-component coating solution may include 100 parts by weight of an aqueous polyurethane resin, 10-25 parts by weight of a curing agent, and 0.1-10 parts by weight of an additive.

The water-based polyurethane resin is a water-dispersed polyurethane resin, polyester polyurethane, polyether polyurethane, polycarbonate polyurethane, polyacetal polyurethane, polyacrylate polyurethane, polyester amide polyurethane, polythioether poly Urethane and polyolefin polyurethane, and the like, preferably, a polycarbonate polyurethane excellent in hydrolysis resistance and heat resistance may be used.

As a specific example, the polyurethane content in the aqueous polyurethane resin may be 20-35% or 20-30%. If it is less than the above range, sensitivity is lowered, and if it exceeds the above range, the elongation is lowered, and thus polyurethane within the above range may be included.

The curing agent may be isocyanate-based, carbodiimide-based, or aziridine-based, but is not limited thereto.

The curing agent may be included in 10-25 parts by weight, or 10-20 parts by weight based on 100 parts by weight of the aqueous polyurethane resin. If it is less than the above range, the curing reaction time is prolonged or the curing reaction does not occur sufficiently, and if it exceeds the above range, the unreacted curing agent remains as an impurity and the usability decreases, so that it can be used within the above range.

The additive may include at least one selected from a light stabilizer, a dispersant, a leveling agent, an antifoaming agent, and a matting agent, and a conventional type used in the art may be used, and thus the type is not particularly limited in the present invention.

The two-component coating solution may have a viscosity of 100-250cps, or 100-200cps at 25°C. If it is less than the above range, the suede texture is not soft and is relatively stiff, and the coating solution flows, reducing coating efficiency.If it exceeds the above range, the coating solution aggregates during coating and impregnation into the knitted fabric is difficult. I can.

In addition, the coating method in step (g) may be any one selected from die coating, gravure coating, knife coating, bar coating, spray coating, or screen printing, but the two-component coating solution to the inside of the fabric In order to smoothly impregnate the gravure coating, a gravure coating may be used.

In addition, through the step (g), the knitted fabric is impregnated with a two-component coating solution, and the amount of the impregnated polyurethane may be 20-50g/linear meter or 25-40g/linear meter. If it is less than the above range, the elongation is lowered, and if it exceeds the above range, the feeling of the polyurethane filler is expressed more strongly than the surface effect of the knitted suede, so it may be impregnated within the above range.

The method of manufacturing knitted suede of the present invention may optionally further include any one or more of (h) flame retardant treatment step and (i) heat treatment step after step (g).

(h) Knitted flame retardant treatment step

In the step (h), a flame retardant is applied to the back of the knitted fabric to impart flame retardancy to the knitted suede. The method of treating the flame retardant on the knitted fabric may be performed using the same method as the coating method of the above two-component coating solution or using a mesh roll.

(i) knitting heat treatment step

The step (i) may be a step of adjusting the width of the suede by heat-treating the knitted fabric flame-retardantly treated through the step (h) at 130-150° C. for 120 seconds in a tenter. If the temperature exceeds the above range, the impregnated polyurethane is yellowed and cured to harden the touch, and thus heat treatment may be performed within the above temperature range.

The method for manufacturing knitted suede according to the present invention as described above can achieve an impregnation effect only by coating with a two-component coating solution containing aqueous polyurethane without impregnation treatment in a separate oil-based polyurethane solution, so that dimethylformamide does not remain. It is eco-friendly and economical as it can realize both the sensitivity and surface properties equivalent to that of high-end suede.

Further, the present invention relates to a knitted suede produced from the above knitted suede manufacturing method.

Knitted suede manufactured by the method of manufacturing a knitted suede of the present invention as described above has excellent sensibilities such as soft touch and filling while satisfying the physical properties required as suede used for automobile interior parts.

Hereinafter, preferred embodiments are presented to aid the understanding of the present invention, but the following examples are only illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention. It is natural that changes and modifications fall within the scope of the appended claims.

[Example]

1. Manufacturing of covering yarn

<Example 1>

By screening, single yarn fineness (C) a second supply the denier of the polyester-based coriander housing and, if the single yarn fineness of 0.1 denier and filament number (B) and then the weight 10 divided sine-type micro-fibers are interlaced and of 2.3kg / cm ² By air entanglement with pneumatic pressure, a covering yarn with a twist number (A) of 500 times per 1 meter of examination was formed (step (a)).

2. Suede manufacturing

The covering yarn of Example 1 formed in the above 1 was knitted to form a knitted fabric having a weight of 260 g/yd and a thickness of 0.6 mm (step (b)).

Subsequently, the knitted fabric is put into a liquid reducer and 1.5% of liquid caustic soda is added at 94°C for 20 minutes to reduce alkali so that the reduction rate becomes 25% (step (c)).

Subsequently, after the first buffing with #180 sandpaper, dyed at 130°C with a disperse dye, washed with water, and reduced-washed to remove uncontaminated dye (steps (d) and (e)).

Subsequently, after secondary buffing with #220 sandpaper to organize the appearance of suede, gravure coating is performed with a two-component coating solution having a viscosity of 200 cps at 25°C so that the polyurethane is impregnated into the knitted fabric (steps (f) and (g)). .

The two-component coating solution may include 100 parts by weight of an aqueous polycarbonate polyurethane resin, 15 parts by weight of carbodiimide as a curing agent, 1 part by weight of a surfactant as a dispersant, and 1 part by weight of a polysiloxane as an antifoaming agent.

Subsequently, gravure-coating a flame retardant on the back of the knitted fabric to impart flame retardancy and heat treatment at 140° C. for about 120 seconds to prepare a knitted suede by matching the suede width (131 inches) (steps (h) and (i)).

<Comparative Example 1>

In Comparative Example 1, a nonwoven fabric having a weight of 260 g/yd and a thickness of 0.6 mm was prepared using only sea-island microfibers having a single yarn fineness of 0.1 denier after weight reduction, and then 100 parts by weight of a polyether polyurethane resin, 20 parts by weight of a pigment, and a flame retardant. 15 parts by weight of the organic solvent was impregnated with an oily polyurethane solution formed by dissolving in 250 parts by weight of dimethylformamide, so that the polyurethane was impregnated into the nonwoven fabric.

Subsequently, after coagulation at a temperature of 30° C., de-dimethylformamide was washed with hot water at 60° C. and dried at 150° C. for 70 seconds.

Then, put the nonwoven fabric in a liquid reducer and add 1.5% of liquid caustic soda at 94°C for 20 minutes to reduce the alkali so that the reduction rate becomes 25%, and then first buff with #180 sandpaper and then use a dispersion dye at 130°C. After dyeing, washing with water and reduction washing were performed to remove uncontaminated dye.

Subsequently, after the second buffing with #220 sandpaper to organize the appearance of suede, an aqueous surface treatment agent having a viscosity of 400 cps at 25°C was gravure coated to prepare the appearance of the knitted fabric.

The aqueous surface treatment agent included 100 parts by weight of an aqueous polycarbonate polyurethane resin, 10 parts by weight of a curing agent, 1 part by weight of a dispersant, 1 part by weight of a leveling agent, and 5 parts by weight of a thickener.

Subsequently, a flame retardant was applied to the back of the knitted fabric to impart flame retardancy, and the suede width (131 inches) was adjusted through heat treatment at 140° C. for about 120 seconds, and then high-grade suede was manufactured.

<Comparative Example 2>

When compared to Comparative Example 1, a knitted suede was prepared in the same manner except that the nonwoven fabric was not gravure coated using an aqueous surface treatment agent.

<Comparative Example 3>

In contrast to Example 1, instead of coating the knitted fabric in step (g) with a two-component coating solution after the second buffing in step (f), the knitted fabric was weaved in step (b) and before the alkali reduction step in step (c). Knitted suede was prepared in the same manner except for gravure coating with a two-component coating solution.

<Comparative Example 4>

In contrast to Example 1, in step (g), instead of the two-component coating solution according to the present invention, the viscosity used in Comparative Example 1 was coated with an aqueous surface treatment agent having a viscosity of 400 cps at 25°C. Knitted suede was prepared.

[Experimental Example]

1. Measurement of the amount of polyurethane impregnation of suede, the amount of residual dimethylformamide (DMF), physical properties and sensitivity

The following table by measuring the amount of polyurethane impregnation, the amount of residual dimethylformamide, the physical properties (elongation, strength) and sensitivity (soft feel, filling) in the knitted suede of Example 1 and Comparative Example 1-4 prepared in the above Example It is shown in 1.

-The amount of polyurethane impregnation in the knitted suede was calculated and measured as [(solid content weight during polyurethane impregnation processing) / (total fabric weight) X 100].

-For the amount of residual dimethylformamide, a certain amount of suede is collected, immersed in methanol, and extracted for 4 hours.

Subsequently, dimethylformamide was extracted by the above process and the contained methanol was analyzed through gas chromatography (Gas-Chromatogtaphy) to measure the amount of dimethylformamide remaining in the knitted suede.

-The elongation was measured by calculating [(gauge distance at break-initial gage distance)/ (initial gage distance) X 100] when a specimen of knitted suede was stretched at a constant speed using a tensioner.

-Strength was measured by calculating the maximum load at break when a specimen of knitted suede was pulled at a constant speed using a tensioner.

-The soft touch was expressed as very good/good/medium/bad/very bad when suede experts touched it.

-The feeling of filling was expressed as very good/ excellent/ normal/ bad/ very bad when suede experts touched it.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 standard Suede fabric knitting Non-woven Non-woven knitting knitting - Polyurethane impregnation amount (g/linear meter) 30 35 35 15 0 20-50 Amount of residual dimethylformamide (g) 0 8 8 0 0 5 or less Elongation (%) 112 55 90 100 105 over 90 Strength (kgf/50mm) 150 248 120 100 153 More than 100 Soft touch Very good Very good usually Bad Very bad Filling Great Great usually usually Very bad -

As confirmed in Table 1 above, Example 1, which is a knitted suede according to the present invention, undergoes a wet process of impregnating the oily polyurethane solution with only the step of coating with a two-component coating solution without impregnation treatment in a separate oily polyurethane solution. It can be seen that it is economical because it is similar to the amount of polyurethane impregnated in Comparative Example 1, and has excellent physical properties compared to Comparative Example 1, which is a high-grade suede, while having the same level of sensitivity.

In addition, the knitted suede of the present invention was coated with a two-component coating solution containing water-based polyurethane, and the residual dimethylformamide was 0 g, which was environmentally friendly because it did not contain dimethylformamide, which is an organic solvent.

In addition, Comparative Example 2 was impregnated with an oily polyurethane solution, but it can be seen that physical properties and sensitivity were lowered compared to Example 1 because a separate surface treatment was not performed.

In addition, Comparative Example 3, which was coated with a two-component coating solution after weaving and before the alkali reduction step, showed that the amount of polyurethane impregnation was lower than that of Example 1, which was coated with a two-component coating solution after the second buffing. I can.

In Comparative Example 4, instead of gravure coating with a two-component coating solution, gravure coating was performed with a high-viscosity aqueous surface treatment agent having a viscosity of 400 cps at 25° C., and it can be seen that sensitivity is degraded because there is no amount of polyurethane impregnated into suede. .

2. Measurement of suede's physical properties (elongation and strength) and sensibility (soft texture and filling)

The physical properties and sensitivity of suede were measured using a covering yarn different from that of Example 1.

<Example 2>

By screening, single yarn fineness (C) is supplied to a 2.5 denier polyester-based coriander housing and, even if the single yarn fineness of 0.1 denier and a filament weight after number (B) 15 split sine-type micro-fibers are interlaced and of 2.3kg / cm ² Air entangled with pneumatic pressure to form a covering yarn having a twist number (A) of 400 times per 1 meter examination, and using the covering yarn, knitted suede was manufactured in the same manner as in Example 1 described above.

<Reference Example 1>

By screening, single yarn fineness (C) a second supply the denier of the polyester-based coriander housing and, if the single yarn fineness of 0.1 denier and filament number (B) after a 35-sine-loss-type micro-fibers are interlaced and of 2.3kg / cm ² Air entangled with pneumatic pressure to form a covering yarn having a twist number (A) of 500 times per 1 meter examination, and using the covering yarn, knitted suede was manufactured in the same manner as in Example 1 described above.

<Reference Example 2>

By screening, single yarn fineness (C) is supplied to a 0.5 denier polyester-based coriander housing and, even if the single yarn fineness of 0.1 denier and a filament weight after number (B) 10 split sine-type micro-fibers are interlaced and of 2.3kg / cm ² Air entangled with pneumatic pressure to form a covering yarn having a twist number (A) of 500 times per 1 meter examination, and using the covering yarn, knitted suede was manufactured in the same manner as in Example 1 described above.

<Reference Example 3>

By screening, single yarn fineness (C) a second supply the denier of the polyester-based coriander housing and, if the single yarn fineness of 0.1 denier and filament number (B) and then the weight 10 divided sine-type micro-fibers are interlaced and of 2.3kg / cm ² Air entangled with pneumatic pressure to form a covering yarn having a twist number (A) of 2000 times per 1 meter examination, and using the covering yarn, knitted suede was manufactured in the same manner as in Example 1 described above.

<Reference Example 4>

By screening, single yarn fineness (C) a second supply the denier of the polyester-based coriander housing and, if the single yarn fineness of 0.1 denier and filament number (B) and then the weight 10 divided sine-type micro-fibers are interlaced and of 2.3kg / cm ² Air entangled with pneumatic pressure to form a covering yarn having a number of twists (A) of 50 times per 1 meter examination, and using the covering yarn, knitted suede was prepared in the same manner as in Example 1 described above.

<Reference Example 5>

A polyester-based high shrinkage yarn having a single yarn fineness (C) of 2 denier, and sea-island microfiber yarn having a single yarn fineness of 0.1 denier and a number of filaments (B) of 10 divided yarns after weight loss, are combined by simple air punching to form a composite yarn, Knitted suede was manufactured in the same manner as in Example 1 described above using a composite yarn.

<Reference Example 6>

Reference Example 6 was prepared in the same manner as in Example 1 described above, except that the composite yarn of Reference Example 5 was woven with warp and/or weft to form a fabric.

<Reference Example 7>

Reference Example 7 After weight reduction, high-grade suede was manufactured in the same manner as in Example 1, except that a nonwoven fabric was manufactured using only sea-island microfiber having a single yarn fineness of 0.1 denier.

<Reference Example 8>

Fabric suede was manufactured in the same manner as in Example 1 described above, except that the covering yarn of Example 1 was woven with warp and/or weft to form a fabric.

The physical properties of the elongation and strength of the suede prepared in Examples 1-2 and 1-8 were measured, and the sensibility of a soft touch and a feeling of filling were measured, and the results are shown in Table 2 below.

As confirmed in Table 2, the knitted suede prepared using the covering yarns according to Examples 1 and 2 of the present invention has excellent sensitivity and physical properties, whereas the suede of Reference Examples 1 and 3 is twisted with the number of filaments, respectively. It was found that the number of pieces was too high, so it was excellent in soft touch and filling, but the elongation decreased due to insufficient flexibility.

In addition, in Reference Example 2, it was found that the single yarn fineness of the high-shrink yarn was too thin, so that the elongation and strength were decreased.

In addition, it was found that the suede of Reference Example 4 and Reference Example 5 had too few twists or no twists, resulting in deterioration of a soft touch and a feeling of filling.

In addition, Reference Example 6 and Reference Example 8 have lower elongation compared to Examples 1 and 2 of the present invention, which is a knitted suede with a woven suede, and in particular, Reference Example 6 is a woven suede using a composite yarn, and has a soft texture and a feeling of filling. I could see that it was falling.

In addition, Reference Example 7 is a high-quality suede manufactured using only sea-island type microfiber, and has similar sensitivity to the suede of the present invention, but it was not appropriate because the elongation was lowered and the manufacturing cost increased as it did not contain high shrinkage yarn.

Claims (14)

(a) forming a covering yarn;
(b) forming a knitted fabric by knitting the covering yarn;
(c) a reduction step of putting the knitted fabric in an alkaline solution so that only the island component of the sea-island microfiber remains;
(d) first buffing the reduced knitted fabric of step (c) with sandpaper;
(e) dyeing the knitted fabric of step (d);
(f) second buffing the knitted fabric of step (e) with sandpaper to organize the appearance;
(g) coating the knitted fabric of step (f) with a two-component coating solution containing 100 parts by weight of an aqueous polyurethane resin having a viscosity of 100-250 cps at 25° C., 10-25 parts by weight of a curing agent, and 0.1-10 parts by weight of an additive. Knitted suede manufacturing method comprising a; The method of claim 1,
The covering yarn of step (a) is examined; And The method of manufacturing a knitted suede that is a yarn (絲) made of island-type microfiber surrounding the examination. The method of claim 2,
The screening is a polyester-based high shrinkage yarn fineness (C) of 1-5 denier knitted suede manufacturing method. The method of claim 2,
The single yarn fineness after the weight loss of the island-in-the-sea microfiber is 0.01-0.5 denier knitted suede manufacturing method. The method of claim 2,
The covering yarn is a knitted suede manufacturing method that satisfies the following formula 1,
-Equation 1-
3≤ [(A/100) X (B)]/[C] ≤80
Here, A is the number of twists of the sea-island microfibers surrounding 1 meter of the screening, B is the number of filaments after weight loss of the sea-island microfibers, and C is the single yarn fineness of the screening process. The method of claim 5,
The number of twists (A) of the island-in-the-sea microfiber surrounding the examination is 300-500 times per 1 meter of examination,
The number of filaments (B) after the weight loss of the island-in-the-sea microfiber is 5-16 divided yarns. The method of claim 1,
In the step (c), the weight loss rate is 15-35%. The method of claim 1,
In the step (c), after the weight of the knitted fabric is reduced, the weight ratio of the screening in the covering yarn to the sea-island microfiber is 15:85-30:70. delete The method of claim 1,
The water-based polyurethane resin is a water-dispersed polyurethane resin, polyester polyurethane, polyether polyurethane, polycarbonate polyurethane, polyacetal polyurethane, polyacrylate polyurethane, polyester amide polyurethane, polythioether poly Knitted suede manufacturing method that is one selected from the group consisting of urethane and polyolefin polyurethane. The method of claim 1,
The coating method in (g) is any one selected from die coating, gravure coating, knife coating, bar coating, spray coating, or screen printing. The method of claim 1,
In the step (g), the content of the polyurethane impregnated in the knitted suede is 20-50 g/linear meter. The method for producing knitted suede having excellent sensitivity. The method of claim 1,
After the step (g), the method for producing knitted suede further comprises at least one of (h) flame retardant treatment step and (i) heat treatment step. 100 parts by weight of an aqueous polyurethane resin having a viscosity of 100-250 cps at 25° C., prepared from the method for producing a knitted suede according to any one of claims 1 to 8 and 10 to 13, 10 to 25 parts by weight of a curing agent, and Knitted suede coated with a two-component coating solution containing 0.1-10 parts by weight of an additive.