KR20150146480A - Yarn coating - Google Patents

Abstract

It is an object of the present invention to provide a yarn coating agent containing a hydrophilic polyurethane resin which does not use an organic solvent. The above object is achieved by using 25 to 29% by weight of an aliphatic isocyanate polyol, 0.4 to 1% by weight of triethylamine as a chain extender, mixing 2 to 4% by weight of N-methyldiethanolamine and 68 to 70% A water-dispersible polyurethane resin; 26 to 32% by weight of an alkali-based copolymer compound, 1 to 3% by weight of an alkali-based polyoxyethylene sodium sulfate, 0.001 to 0.2% by weight of potassium sulfate, and a balance of water; Wherein the polyurethane resin is produced by mixing dispersed water.

Description

{YARN COATING}

The present invention relates to a yarn coating agent.

Fabrics used in clothing, shoes, bags and beds are generally vulnerable to water or contamination. Therefore, the yarn which is the material of the fabric is coated by using the yarn coating agent, and the fabric is manufactured by using this yarn to protect the fabric from water and contamination.

Conventional yarn coating agents for coating yarns are made of hydrophobic materials such as polyurethane resin, silicone and poly vinyl chloride which are excellent in flexibility, processability, chemical resistance, stain resistance and waterproofness .

However, when coating a yarn with a coating agent containing such a material, the organic solvent such as toluene, acetone, methyl ethyl ketone, and cyclohexane is harmful to the human body and the environment and the solvent for diluting the existing hydrophobic material is harmful to the residual organic solvent A fire may occur.

Further, when the coating agent is directly applied to the yarn, it is not uniformly applied to the yarn, which is problematic in appearance.

It is an object of the present invention to provide a yarn coating agent containing a hydrophilic polyurethane resin which does not use an organic solvent.

Another object of the present invention is to provide a yarn coating agent in which a polyurethane resin is uniformly coated so that a yarn and a fabric are apparently beautiful.

The above object is achieved by using 25 to 29% by weight of an aliphatic isocyanate polyol, 0.4 to 1% by weight of triethylamine as a chain extender, mixing 2 to 4% by weight of N-methyldiethanolamine and 68 to 70% A water-dispersible polyurethane resin; 26 to 32% by weight of an alkali-based copolymer compound, 1 to 3% by weight of an alkali-based polyoxyethylene sodium sulfate, 0.001 to 0.2% by weight of potassium sulfate, and a balance of water; Wherein the polyurethane resin is produced by mixing dispersed water.

Wherein the water-dispersible polyurethane resin is mixed in an amount of 5 to 15% by weight, the thickener in an amount of 0.001 to 0.01% by weight and the remainder in dispersed water, and the water-soluble emulsion in an amount of 3 to 10% It is preferable that at least one of the acrylic resin and the polyolefin resin is mixed in an amount of 0.001 to 5 wt% relative to 100 wt% of the water-soluble emulsion. The dispersion water may be water or distilled water.

The yarn coating agent may be at least one of an inorganic filler, a suspending agent, an emulsifier, a wetting agent, a dispersing agent, a pH adjuster, a pigment, a plasticizer, a foaming agent, a stabilizer, a lubricant, a cryoprotectant, an ultraviolet absorber, an antistatic agent, , And the yarn coating agent preferably has a viscosity of 100 to 300 cps.

The yarn coating agent according to the present invention can eliminate the organic solvent when coating the polyurethane resin. Further, the polyurethane resin is uniformly coated, and the yarn and fabric are beautiful.

1 is a flow chart of a method of manufacturing a yarn coating agent according to an embodiment of the present invention,
Figure 2 is a cross-sectional view of primary and secondary coated yarns,
3 is an enlarged view of the fabric before and after fusion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fabric including a yarn coating agent, a method of manufacturing a yarn coating agent, a coated yarn and a coated yarn will be described in detail with reference to the drawings.

As shown in FIG. 1, the yarn coating method first prepares a yarn coating agent (S1). The yarn coating agent smoothes the surface of the yarn to form a precise and uniform surface. Herein, the yarn may be a synthetic yarn such as nylon, a polyester, a polypropylene, a polyamide, a polyacrylamide, a polyvinyl chloride, or a synthetic yarn such as rayon, It may be regenerated yarn such as acetate.

The yarn coating agent is prepared using a water-dispersible polyurethane resin. When a nonwettable, lipophilic polyurethane resin is used to produce a yarn coating, the yarn must be coated with an organic solvent such as methyl ethyl ketone or toluene. This can leave stains on the yarn and have a detrimental effect on the human body and the environment. In addition, fire may be caused by residual organic solvents. Therefore, a water-dispersible polyurethane resin which is low in human health and is eco-friendly resin is used to produce a yarn coating agent.

The water-dispersible polyurethane resin is obtained by using 25 to 29% by weight of an aliphatic isocyanate polyol, 0.4 to 1% by weight of triethylamine as a chain extender, 2 to 4% by weight of N-methyl diethanolamine and 68 to 70% And mixed. A thickener mixed with 26 to 32% by weight of an alkaline-based copolymer compound, 1 to 3% by weight of an alkali-based polyoxyethylene sodium sulfate, 0.001 to 0.2% by weight of potassium sulfate, and the balance of water was added to the water-dispersible polyurethane resin Mixed with dispersion water and stirred to prepare a yarn coating agent.

Wherein the water-dispersible polyurethane resin is 5 to 15 wt%, the thickener is 0.001 to 0.01 wt%, and the remainder is mixed with dispersed water to obtain a viscosity of 100 to 300 cps. When the content of the water-dispersible polyurethane resin is less than 5% by weight, the resin particles are not fixed to the yarn to be coated, thereby failing to smoothly smooth the surface of the yarn. When the content of the water-dispersible polyurethane resin is more than 15% by weight, the viscosity of the yarn coating agent becomes high, and the coating is not uniformly applied to the yarn, resulting in bending.

A water-soluble emulsion may be added to the yarn coating agent in an amount of 3 to 10% by weight based on 100% by weight of the yarn coating agent. The water-soluble emulsion is preferably an acrylic emulsion or a polyolefin emulsion capable of acting as a binder to easily adhere the yarn coating agent to a yarn. When such a water-soluble emulsion is added to a yarn coating agent, it is possible to form a rubber-like elastic film that retains tension and breaking force. It is preferable that the acrylic emulsion and the polyolefin emulsion each contain an acrylic resin and a polyolefin resin in an amount of 0.001 to 5% by weight based on 100% by weight of the emulsion.

If desired, the yarn coating agent may further contain various additives depending on the use thereof. The additives may be inorganic fillers, suspending agents, emulsifiers, wetting agents, dispersing agents, pH adjusting agents, pigments, plasticizers, foaming agents, stabilizers, lubricants, cryoprotectants, ultraviolet absorbers, antistatic agents, antioxidants, antiseptics and antimicrobial agents.

The yarn coating agent is first coated on the coated yarn (S2). At this time, make sure that the tension of the yarn coating agent is balanced so that the yarn can sufficiently penetrate the yarn. The tension applied to the yarn varies depending on the type of yarn. In some cases, the coating may be applied at high temperature to allow the yarn coating agent to penetrate well into the yarn. Since the yarn coating agent has a viscosity of 100 to 300 cps, it is uniformly applied to the yarn without bending.

The yarn coated with the yarn coating agent is dried (S3). The coated yarn coated on the surface of the yarn is subjected to hot air drying in a hot air dryer at 130 to 170 ° C. When the yarn is dried, the moisture contained in the yarn coating agent applied to the yarn is dried, and only the yarn coating agent except moisture is left coated on the yarn. If the yarn is dried in a hot air at a temperature of less than 130 ° C, it takes a long time to dry to reduce the efficiency of yarn production. If the drying temperature exceeds 170 ° C, deformation of the yarn may occur. In some cases, the coated yarn can be dried by hot pressing at a temperature of 100 to 130 ° C instead of hot air drying.

The hot air-dried raw material is cooled through a water-cooled cooler at 0 to 30 ° C, and the cooled raw material is re-dried again through a hot air dryer at 130 to 170 ° C. When this process is carried out, the moisture in the yarn coating agent remains and is completely dried. The coated yarn is dried after the yarn coating agent penetrates between the surfaces of the yarn having a relatively rough surface, and the surface is smoothly cleaned by the yarn coating agent.

The dried yarn is secondarily coated with a thermoplastic polyurethane resin (S4). Thermoplastic polyurethane resins are widely used for waterproof coatings in various products because they are resistant to moisture and contamination. Wherein the thermoplastic polyurethane resin uses a solventless formulation that is not diluted in a solvent. When using a type that is diluted with a solvent, an organic solvent should be used. In this case, as in the above case, not only is it harmful to the human body and environment, but also a residual organic solvent may cause a fire. Therefore, a solventless thermoplastic polyurethane resin which does not use a solvent is coated. The thermoplastic polyurethane resin secondary coated on the yarn is mixed with 15 to 25 wt% of polyol, 25 to 35 wt% of 1,4-butanediol, and 40 to 60 wt% of 4,4-methylenediphenyl diisocyanate. The secondary coating can be extruded or coated by molding, and the processing temperature is in the range of 160 to 240 캜. When the processing temperature exceeds 240 캜, the thermoplastic polyurethane resin is decomposed.

The secondary coated yarn is cooled (S5). The second coated yarn at high temperature is rapidly cooled through a water-cooled cooling device to dry the yarn. Because of the hygroscopic nature of the thermoplastic polyurethane resin, rapid cooling must be applied before absorbing moisture through the rapid cooler. In some cases, it is dried through a hot-air drier before cooling to partially remove moisture and cool the yarn. The cooled yarn completely removes moisture through a hot air dryer.

The fabric is woven using yarns coated with the water dispersible polyurethane resin and the thermoplastic polyurethane resin obtained through steps S1 to S5. At this time, the density of the fabric can be adjusted according to the use of the fabric.

In some cases, it is possible to perform a heat fusion process using a heat roller on a woven fabric. After the heat roller is disposed on one side or both sides of the fabric, the fabric passes between the rollers, and the resin coated on the yarn in two stages is softened again to perform the heat fusion process as shown in FIG. The fabric produced by this method is a film-like fabric coated on the entire outer surface.

The fabric obtained through such a yarn can be coated with a yarn coating agent and a thermoplastic polyurethane resin to protect the fabric from moisture and contamination with a waterproof coating layer formed. In addition, by adding various additives that can not be imparted to the yarn itself, various effects can be obtained that can not be obtained from the conventional fabrics.

It is harmless to the human body and the environment because it does not use organic solvent and can uniformly coat the surface of the yarn with a yarn coating agent to produce an apparently beautiful yarn and fabric having a uniform surface.

Hereinafter, the present invention will be described in more detail with reference to Examples. It will be apparent to those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not construed as being limited by these examples.

(1) Preparation of yarn and production of the yarn coating agent of the present invention

Nylon 210d / 36f yarn and polyester yarn air-textured yarn and polyester 250d, 300d yarn through the refining process to remove enough radiant oil and other foreign materials attached to the yarn.

A water dispersible polyurethane resin comprising 28% by weight of an aliphatic isocyanate polyol and 0.7% by weight of triethylamine as a chain extender and containing 3% by weight of N-methyl diethanolamine and 68.3% by weight of water was prepared, Based copolymer compound, 29% by weight of an acrylic copolymer, 1.5% by weight of an alkali-based polyoxyethylene sodium sulfate, 0.1% by weight of potassium sulfate and 69.4% by weight of water.

15% by weight of the water-dispersible polyurethane resin, 0.0075% by weight of the thickener, and the remaining part is mixed with the dispersing water and stirred to form a yarn coating agent having a viscosity of 150 to 200 cps.

(2) coating and drying of yarn coatings

Put the prepared yarn on the krill, apply the yarn coating agent to the yarn, and adjust the tension of the yarn so that the applied amount can sufficiently permeate the yarn. The tension of the yarn is arbitrarily adjusted according to the kind of the prepared yarn.

The coated yarn is dried for 60 to 90 seconds in a hot-air dryer at 130 to 170 ° C to remove moisture in the coating agent, and then the yarn is cooled through a water-cooled cooling device. The yarn coating agent is cured by re-drying for 60 to 90 seconds in a hot-air dryer at 130 to 170 DEG C to remove residual moisture in the cooled yarn. After the primary coating process, the water-dispersible polyurethane resin is penetrated into the surface of the yarn to form a film.

 (3) Coating and drying thermoplastic polyurethane resin using melt extrusion

The solventless thermoplastic polyurethane resin was prepared by polymerizing 20 wt% of polyol, 30 wt% of 1,4-butanediol, and 50 wt% of 4,4-methylenediphenyl diisocyanate in a chamber at 160 캜 for 12 to 15 minutes.

The produced thermoplastic polyurethane resin is put into a hopper and extruded through a spin-hole of a required size together with the yarn through a melt extruder connected to the hopper. The polyurethane resin to be extruded is injected in a form in which the yarn is arranged in the central region and coated so as to surround the yarn. At this time, the melt temperature of the extruder is adjusted to 180 to 200 ° C, and the thermoplastic polyurethane resin and the yarn are injected and immediately dried through a water-cooled cooling device. Since the thermoplastic polyurethane resin is hygroscopic, preliminary drying is necessary, but it is solved by rapid cooling.

After cooling, the yarn is completely dried in a hot-air dryer at 130 to 170 ° C for 60 to 90 seconds. As shown in Fig. 2, the yarn produced through such a process has a smooth surface without unevenness.

(4) Fabric manufacturing

The above yarns were weaved to fabricate polyester yarn of 250d by using a loom in an optimal manner of 36 yarns per inch of warp and weft. The thermoplastic polyurethane resin coated yarn was not easy to weave due to non-slip properties, but after processing the water-soluble oil, the woven fabric was easy to fabric.

(5) Heat fusion of fabric

The woven fabric was successively dried in a first chamber of 120 캜, a second chamber of 150 캜 and a third chamber of 100 캜. The dried fabric was passed through a cooling roller to form the final product. At this time, the tension of the yarn was treated uniformly so that the warp and weft directions were not disturbed and the rectangular shape was maintained.

Thereafter, the thermoplastic polyurethane resin adhered to the surface of the raw material facing the direction of the heat roller was allowed to soften between the drive roller at room temperature and the high-temperature heat roller at a uniform speed by using a heat roller at 95 to 115 ° C. The softened thermoplastic polyurethane resin is thermally fused and coated on the fabric in film form. At this time, the coating layer on the film can form an ultra-thin film having a thickness of 0.01 to 0.02 mm.

After the film-coated fabric is finished through the cooling roller, it is aged and dried at room temperature or in a cooling chamber to complete the final product.

In order to confirm the functionality of the fabric after the above process, optimum working conditions were examined through Tables 1 and 2.

According to the heat fusion test according to the fusing temperature and the pressing time, the fusing quality measurement result was confirmed through the conditions 1 to 4 according to the given conditions.

Results of thermal fusion test unit Condition 1 Condition 2 Condition 3 Condition 4 Fusion temperature ℃ 95 100 115 125 Pressing time sec 15 15 10 8

Results of welding quality measurement Condition 1 Condition 2 Condition 3 Condition 4 Filming state ○ ☆ ☆ △ Wrinkle resistance ○ ○ ☆ △ ☆: Excellent, ○: Fair, △: Poor

As shown in Tables 1 and 2, the raw fabric of the conditions 1 to 4 according to the present invention had good heat-sealing efficiency at a temperature of 115 ° C for 10 seconds, and the fabric was in a good filming state and had high resistance to wrinkles And the quality was excellent.

Claims (6)

In the yarn coating agent,
25 to 29% by weight of an aliphatic isocyanate polyol, 0.4 to 1% by weight of triethylamine as a chain extender, 2 to 4% by weight of N-methyl diethanolamine and 68 to 70% by weight of water, A resin;
26 to 32% by weight of an alkali-based copolymer compound, 1 to 3% by weight of an alkali-based polyoxyethylene sodium sulfate, 0.001 to 0.2% by weight of potassium sulfate, and a balance of water;
Wherein the water-dispersible resin is produced by mixing dispersed water. The method according to claim 1,
Wherein the water dispersible polyurethane resin is contained in an amount of 5 to 15% by weight, the thickener is contained in an amount of 0.001 to 0.01% by weight, and the balance is dispersed in water. 3. The method of claim 2,
And 3 to 10% by weight of a water-soluble emulsion is mixed with respect to 100% by weight of the yarn coating agent. The method of claim 3,
Wherein at least one of an acrylic resin and a polyolefin resin is mixed in an amount of 0.001 to 5% by weight based on 100% by weight of the water-soluble emulsion. The method according to claim 1,
At least one of an inorganic filler, a suspending agent, an emulsifier, a wetting agent, a dispersing agent, a pH adjuster, a pigment, a plasticizer, a foaming agent, a stabilizer, a lubricant, a cryoprotectant, an ultraviolet absorber, an antistatic agent, an antioxidant, . The method according to claim 1,
Wherein the yarn coating agent has a viscosity of 100 to 300 cps.

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