KR101249934B1 - Process Of Producing Suede―like Polyurethane―impregnated Textiles Using NanoFilaments - Google Patents

Abstract

 The present invention relates to a method for producing a suede-woven knitted fabric impregnated with nanofilament, and is excellent in dyeing, anti-pilling, and color fastness using conventional yarns having finer yarns than conventional islands-in-the-sea yarns. It can provide high quality microfiber suede knitted fabrics with thinner and softer properties than the manufactured suede knitted fabrics, and can provide suede knitted fabrics that can be widely deployed for high-tech IT cases or wiping products. Can be.

Description

Process of Producing Suede-like Polyurethane-impregnated Textiles Using NanoFilaments}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyurethane-impregnated suede knitted fabric using nanofilament, and more particularly, to a high-quality suede knitted fabric that can be widely used for high-end IT products, wiping products, and the like.

Nanofilaments are ultra-fine filaments with cross-sectional diameters ranging from hundreds of nanometers to tens of nanometers. Melt blown method, flash spinning, electrospinning, island-in-the-sea composite spinning have been developed for manufacturing general nanofibers, and the most stable method of manufacturing nanofilaments is the island-in-the-sea composite spinning method. .

The island-in-the-sea composite spinning method uses the above three methods in such a way that an island-like polymer, which finally becomes a bundle of microfiber filaments, is planted in a soluble sea component polymer, and then ultra-fine filaments are obtained by eluting the sea component in a subsequent step. Since the filament-like fiber can be manufactured, there is an advantage that it is possible to manufacture and use the product in various forms with excellent physical properties.

In Korea, major chemical companies are developing ultra-fine fibers in the form of long fibers as island-in-the-sea composite spun yarns, but their use is limited to apparel with 0.01 denier level of commercialization. Meanwhile, knitted artificial leather and suede products made of microfiber are being commercialized as a substitute for natural leather, and demand for functional clothing, sportswear, furniture, and shoes is expanding, but soft touch and volume are comparable to that of natural leather. For this purpose, the development of knitted artificial leather or suede products using nanofilaments of 600 nm or 400 nm or less has emerged, but the morphological stability of the final product is reduced due to the difficulty of using the nanofilament and the strict conditions for providing it. Due to poor appearance, product strength and touch had a problem such as poor.

Therefore, the present invention is superior to the physical properties of knitted artificial leather or suede products using microfibers of less than 0.01 denier class, which is conventionally limited to apparel. It is a technical task to provide the optimum weight reduction technique, high-quality dyeing and post-processing technique necessary for providing an emotional suede knitted fabric.

Therefore, according to the present invention, a polyester-based island-in-the-sea yarn having a single yarn fineness of 0.006 to 0.01 denier after elution and an interlaced yarn of a high shrink polyester filament having a non-shrinkage of 2-3 denier having a non-shrinkage of 20 to 30% is knitted. / yd, after the interlock knitted fabric of 0.4 ~ 0.6㎜ even after, after reducing the alkali dyeing, presetting, brushed, oil-based polyurethane impregnation, heat treatment, buffing at 100 ~ 150% pickup rate, characterized in that the finished Provided is a method of making a polyurethane impregnated suede knitted fabric using nanofilaments.

Hereinafter, the present invention will be described in more detail.

In the method of manufacturing a polyurethane-impregnated suede-like knitted fabric using the nanofilament of the present invention, the constituent yarn of the knitted fabric is composed of an eluting component and a fiber forming component, and a polyester-based island-in-the-sea yarn having a single yarn fineness of 0.006 to 0.01 denia and a nonaqueous yarn of 20 to 30% The interlaced yarn which interlaced high shrinkage polyester filament of 2-3 denier with single yarn fineness which has shrinkage rate is used. In order to retain the soft and voluminous characteristics of the suede knitted fabric, which is the final product of the present invention, the sea component is eluted in the post-processing process, so that the fineness after elution of the single yarn fiber of the island component is preferably 0.006 to 0.01 denia.

In addition, the high shrink polyester filament shows the same physical properties as the normal yarn when knitting, but when the hot water is met in the refining and dyeing process, the high shrinkage polyester filament is particularly 20 to 30% It is preferable to use a filament having a non-shrinkage ratio. The polyester-based island-in-the-sea yarn and the high-shrink polyester-based filament are preferably composed of interlaced yarns so as to be mixed at a weight ratio of 60:40 to 80:20. This shows a non-shrinkage ratio more than twice that of general polyester filaments, and natural loops are formed by the difference in shrinkage of polyester seams and shrinkage by the subsequent shrinkage process by air entanglement with polyester seams as in the present invention. This is because the process is easy and the suede effect of the fabric is improved.

Knitting weight of 260-290 g / yd and interlock knitted fabric of 0.40-0.60 mm thick after the interlaced yarn is reduced, and the weight is reduced after alkali, where the weight reduction process is an important process for determining the fineness of island-in-the-sea yarns. And processing time are important. In the case of general fabrics, caustic soda is used at 1 ~ 10% by weight in a rotary washer and treated at 95 ℃ for 30 minutes.However, in the case of knitted fabrics, it is carried out in a liquid reducer to help maintain shape stability, and it is easy to penetrate alkali. However, in case of using high concentration of alkali, the amount of caustic soda is determined within 0.5 ~ 1.5% (OWS) because the yarn is excessively reduced during elution, and the overall quality can be degraded. Process it for about 20 ~ 40 minutes to melt the sea component in sea island, leaving only the island component to create a very fine suede surface.

At this time, it is desirable to control the reduction rate within 24 ~ 30%, but less than 24% does not express the microscopic effect according to the weight loss. Care must be taken because deterioration may cause poor appearance and deterioration of product strength.

The ultra-fine knitted fabric can be the same solid dyeing according to the color of the pigment during polyurethane impregnation, and in some cases undyed or dyed in a different color than the pigment can be obtained a melange effect. In the high-pressure rapid dyeing machine can be dyed by using a disperse dye, the disperse dyes are heavily polluted polyurethane, so it can be performed by reducing the washing several times to increase the fastness.

After presetting, the speed is 15 ~ 25m / min under 150 ~ 180 ℃. If the temperature is less than 150 ° C., the shrinkage of the knitted fabric may be lowered. When the temperature is over 180 ° C., thermal curing may occur, resulting in a decrease in elasticity, resulting in stiffness of the product and deterioration of overall physical properties such as tear strength and tensile strength.

After brushing after the presetting, oil-based polyurethane impregnation is performed at 100-150% pickup rate (Wet). Polyurethane impregnation is performed by the unique elasticity, dense structure, etc. It is performed to give a suede jaw. The polyurethane impregnation process generally consists of impregnating bubbles in a polyurethane resin solution and then immersing in the coagulation solution to solidify the polyurethane, wash with water, and dry. The polyurethane resin used consists of polyols and diisocyanates. As said polyol, polyester type, polyether type, polyether ester copolymer type, polycarbonate type, etc. are mentioned. Examples of polyether polyols include polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Among them, polytetramethylene having low melting temperature and secondary transition temperature, excellent elastic recovery and mechanical properties, and particularly strong alkali resistance Most preferred is glycol. Polyester-based polyols have the advantages of low cost and strong resistance to chlorine water compared to polyether-based, but has the disadvantage of poor hydrolysis resistance.

In addition, the polyurethane resin used in the artificial leather manufacturing method of the present invention preferably controls the solidification rate by controlling the contact effect of water and polyurethane using a surfactant. Pigment is added to the polyurethane resin in accordance with the desired color by mixing the surfactant with the pigment. Dissolve the polyurethane resin in DMF, a solvent, and squeeze it with a constant pressure using a squeegee roller to uniformly infiltrate the polyurethane, and then solidify simultaneously while solidifying in a mixed solution of water at 30 ℃ and 15 ~ 30% DMF. Let If the temperature is too low, it will not become de-DMF and the coagulation will be delayed.

After coagulation, squeeze with 5-7 mangles in a washing tank and repeat washing with water to complete complete washing and de-DMF. The water bath temperature is 60-80 degreeC. Then, after drying in the tenter, the polyurethane of the over-impregnated epidermal layer was uniformly polished using sandpaper to expose the pre-brushed wool distributed in the fabric to the epidermis. Suede jaw may appear.

Polyurethane impregnation allows the polyurethane to be 100-150% of the pickup rate (Wet) in the same manner as above, to solidify, washed with water. As the DMF becomes the DMF, the particle size of the DMF eluted is about 0.2 to 50 micrometers, which may also show a water vapor permeability effect. That is, rainwater, etc., has a particle size of several hundred micrometers and water vapor coming out of the human body has a microscopic size of about 0.005 micrometers, so that it is waterproof.

After wet impregnation, the fabric is heat-treated at 130-150 ° C. for 120 seconds in a tenter to perform dry heat setting. Polyurethane is a thermosetting resin, so when the temperature exceeds 150 ° C, yellowing and curing become hard, and the touch becomes hard. Thereafter, the buffing process is performed so that the polyurethane is cut and buffing is performed so that the inner islands can be drawn. The buffing process is widely used because of its excellent workability and good work efficiency. It is effective to start sanding from # 180 and finish with finer # 320. If necessary, the backing is weakened with # 220.

Thereafter, the temperature is gradually increased from 50 ° C. to 90 ° C. in a liquid reducer or dyeing machine to perform a refinement reduction process to sufficiently shrink and stabilize the knitted fabric. Pharmaceutical agents are refined using 1 g / l anionic surfactant and 0.5 g / l 50% sodium hydroxide. The raw paper width of the fabric is reduced by 50% by the refining and shrinking process, and the thickening is increased. The refining reduction process is carried out for 20 minutes at 90 ° C. through a dyeing machine or a liquid reducer to obtain the desired thickness and width by removing the spinning oil and densifying the fabric structure.

Therefore, according to the present invention, using fine yarn finer than conventional islands and yarns, excellent fine dyeability, anti-pilling and dyeing fastness, but high-quality microfiber suede-like fabrics having a thinner and softer physical properties than suede yarns made of conventional islands It can be widely used in the case of high-end IT products and the product for wiping cloth.

1 is a surface photograph (× 50) of the constituent yarn after a 30-minute weight loss of the polyurethane-impregnated suede knitted fabric using the nanofilament of the present invention,
Figure 2 is a side photograph (× 1,000) of the constituent yarn after 30 minutes of weight loss of the polyurethane-impregnated suede knitted fabric using the nanofilament of the present invention,
3 is a cross-sectional photograph (× 500) of the constituent yarn after 30 minutes of weight reduction of the polyurethane-impregnated suede-like knitted fabric using the nanofilament of the present invention,
Figure 4 is a photograph of a polyurethane impregnated suede knitted fabric using the nanofilament of the present invention,
5 and 6 are test reports on the physical properties of the polyurethane-impregnated suede knitted fabric using the nanofilament of the present invention.

The following examples are given as non-limiting examples of the method for producing a polyurethane-impregnated suede knitted fabric using the nanofilament of the present invention.

Example 1

 After elution of single-fiber fibers of inter-component fiber, interlaced yarns were made by interlacing 0.006 ~ 0.01 denier-type polyester island-in-the-sea yarn (70d / 18fila) and high-density yarn (non-shrinkage rate 24%, 30d / 12fila) with single yarn fineness 2.5 denier The final fineness was prepared to be 100d / 30fila, and the interlock knitted fabric weighing 280g / yd and the thickness of 0.6mm was knitted, and then the caustic soda was treated at 95 ° C. for 30 minutes using 1.5% by weight (ows) of weight loss by 28%. After reducing the weight with alkali, disperse dyes at 130 ℃ for 40 minutes (Foron Yellow Brown RD-S (S type), Foron Rubine S-WF (S type), Foron Blue RD-E (S type) mixed 2% owf) After dyeing with, do presetting and brushing for 20 minutes under 160 ℃ condition, and then impregnated with oil-based polyurethane at 120% wet pick-up rate, and heat-treated the fabric by heat treatment at 130 ℃ for 120 seconds in a tenter Using sandpaper, uniformly polish the polyurethane of the over-impregnated epidermal layer and distribute it inside the fabric. The raised wool was exposed to the epidermis and finished.

The physical properties of the suede knitted fabric of Example 1 were measured and shown in Table 1 below.

Evaluation item unit shame Assessment Methods

Example 1


Color fastness class Level 3 or higher ISO 105-C06 Daylight fastness class Level 3 ISO 105-B02 Color fastness class Level 4 or higher ISO 105-X12 Peeling class Grade 4 KS K 0502 Wear strength cycle 20,000 or more ASTM D4966 After mm 0.6 The affinity law

Claims (3)

Knitting weight of 260 ~ 290g / yd, thickness of polyester-based island-in-the-sea yarn with single yarn fineness of 0.006 ~ 0.01 denier after elution and high shrinkage polyester filament with single shrink fineness of 2 ~ 3 denier with 20 ~ 30% non-shrinkage Knit 0.4 ~ 0.6mm interlock knitted fabric, reduce alkali by 0.5 ~ 1.5% (ows) NaOH at 85 ~ 95 ℃ for 30 ~ 40 minutes and reduce it at 24 ~ 30%, dyeing, presetting, brushing, 100 ~ A method for producing a polyurethane-impregnated suede knitted fabric using nanofilaments, characterized in that it is completed by oil-based polyurethane impregnation, heat treatment, and buffing at a 150% pickup rate.
delete The method of claim 1, wherein the presetting is performed at a temperature of 15 to 25 m / min under a condition of 150 to 180 ° C.

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