KR100962322B1 - Process Of Producing Suede-like Circular Knit Type Artificial Leather Having Rich Fullness - Google Patents

Abstract

     The present invention is a composite yarn (CIRCULAR KNIT) by plying (interlacing) any one of the polyester islands and seams and polyester split composite yarns that can be eluted with microfiber, and reduced weight, dyeing, drying, brushing both sides After filling, drying, PU (POLYURETHANE) impregnation, drying, double-sided sanding, reduction washing, washing, and complete drying process, the elegant feeling of filling that can be used as a differentiated product in pockets, jewelry storage, electronics storage bags and clothing It relates to a manufacturing method of abundant suede-like artificial leather. Advantageous Advantages of the Invention According to the present invention, the surface of the microfiber cloth, which has undergone dyeing after elution, is impregnated with polyurethane to form a filling-filled surface. There is this.

Interlacing, circular knitting, weight loss, suede artificial leather

Description

Process of Producing Suede-like Circular Knit Type Artificial Leather Having Rich Fullness}

The present invention relates to a method of manufacturing suede-like artificial leather rich in elegant filling that can be used for pockets, jewelry storage, electronics storage bags and clothing.

The manufacturing method of artificial suede generally uses microfiber as the surface yarn of woven fabric or tricot, and it is usually derived from microfiber through alkali reduction (elution process) using sea island sand or split composite yarn. The mechanism is that the sea component is hydrolyzed very sensitive to alkali by using a water-soluble polyester, so that only the general polyester, which is a island component, remains, forming a microfiber of 0.03 to 0.3 denier. After that, dyed with high pressure dispersant, late hair, and dried, wet coating of polyurethane (hereinafter referred to as PU) is used in some cases. At this time, dimethyl formamide (DMF), an organic solvent of PU, It is used as a decolorizing agent of high pressure dispersant, which has a disadvantage of severe color change, which has become a big problem in the textile industry. However, if the dyeing paper is thoroughly reduced and washed before the PU wet coating to remove the disperse dye present between the unfixed dye and the fiber, and the PU wet coating process, dispersing dye discoloration by DMF can be prevented.

Therefore, according to the present invention solves the above problems, suede-like artificial leather rich in elegant feeling of filling that can be used as a differentiated product for pockets, jewelry storage, electronics storage bags and clothing, without dye transfer by dyes It is a technical task to provide with excellent workability.

According to the present invention, in the method of manufacturing suede-like artificial leather of circular knit tissue, it is composed of an eluting component and a fiber forming component and has a single yarn fineness of 0.03 to 0.3 denier after elution. CIRCULAR KNIT with interlocked or double-layered tissue with interlaced high shrinkage polyester filament yarn with 1 ~ 4 denier with non-shrinkage ratio of ~ 50% Filled circular knitting structure, characterized in that the first heat treatment, double-sided raising, second heat treatment, polyurethane impregnation, third heat treatment, double-sided sanding, reduced washing, batch mangung washing and fourth heat treatment Provided is a method for producing suede-like artificial leather.

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

The method of manufacturing suede-like artificial leather of the circular knitting tissue rich in the feeling of filling according to the present invention is a method characterized by a reduction in weight. Dough → weight loss → dyeing → reduction washing → heat treatment → double-sided brushing → heat treatment → PU impregnation → heat treatment → double side sanding → reduction washing → washing → heat treatment → completion.

Microfibers, which are the core of suede artificial leather in the present invention, can be generally obtained by a manufacturing method such as sea island type, split type, and direct spinning type, but in the present invention, the islands and split type microfibers are doubled. Using to manufacture a suede-like artificial leather for each characteristic.

The manufacturing method of the island-in-the-sea yarn and the divided composite yarn in the present invention is as follows. First, since the sea component should have a molecular structure that can be easily dissolved in alkali, the sea component is manufactured by modifying a general polyester (REGULAR POLYESTER) with a component 40 times faster than the normal polyester to reduce the weight. Alkaline reduction of the island-in-the-sea yarn or the composite composite yarn manufactured using the general polyester causes the sea component to be eluted, leaving only the general polyester, which is the island component, to make a polyester microfiber having a single yarn fineness of 0.03 to 0.3 denier. Interlaced yarn refers to the interlocking yarn of the polyester-based islands or split composite yarn and the high shrink polyester filament, in the present invention, the high shrinkage of polyester-based microfiber yarn (sea island or divided composite yarn) and single yarn fineness 1 ~ 4 denier It is preferable to use the entangled yarn which air-interlaced the polyester filament.

The high shrink polyester filament used in the present invention is a yarn that shows the same physical properties as a normal yarn when knitted, but exhibits high shrinking properties when hot water is encountered in refining and dyeing processes. In the present invention, the polyester filament preferably uses a filament having a non-shrinkage ratio of 20 to 50%, which has a non-shrinkage ratio of 2 times or more than that of a general polyester filament, thereby reducing post-air shrinkage due to air entanglement with polyester islands Due to the difference in shrinkage with the polyester-based islands or divided composite yarns by processing, a natural loop is formed, the raising process is facilitated, and the suede effect of the fabric is improved.

Circular knitting (CIRCULAR KNIT) is a circular knitting yarn interlaced with any one of the polyester seaweed yarn and polyester split composite yarn which can be eluted with the microfiber, and the high shrink polyester filament. Knit the gauge by adjusting the gauge from 22-40 to 150-500 grams / yard. Particularly, it is preferable to use 150 ~ 300g / yard, 22 ~ 28 gauge for light and active clothes, and to adjust 300 ~ 500g / yard, 32 ~ 40 gauge for high density and small weight Suede products can be provided that are suitable for use in pockets or for patching patterned materials. The circular knitting is preferably used for interlocking or double-paper tissue to express the properties of filling both sides of the suede artificial leather, which is the final product.

The circular knitted fabric is conventionally reduced in an atmospheric pressure reducer to elute the sea component to form a polyester microfiber having a single yarn fineness of 0.03 to 0.3 denier, leaving only ordinary polyester as an island component. Thus, in the present invention, the circular knitted fabric is reduced in weight, and the yarn is eluted through the reduced weight to make the microfiber to be full. This allows the polyurethane to be placed between the microscopic yarns in the impregnation process, making the suede with excellent filling.

After reduction, dyeing process is used. The dye used in the present invention should use a dye having a low MIGRATION in urethane. After dyeing, the knitted fabric is reduced washed and subjected to the first heat treatment, and maintains a tenter speed to receive heat for 50 seconds to 100 seconds at a temperature of 180 to 200 ° C. To prevent curling on the side, cut the side using melamine resin, so that the work can be smoothed during coating. In the reduction of the present invention, contamination of the dispersed dye occurs with PU. In order to prevent this, reduction and washing should be thoroughly performed before PU impregnation. In addition, contaminated dye is removed once again through a reduction and washing process after PU impregnation.

Since both sides of the circular knitted brush, suede-like artificial leather of the present invention can vary the weight depending on the degree of raising and can also adjust the thickness.

After the double-sided brushing, the knitted fabric of the drying process by the second heat treatment is coated with a polyurethane elastic material to fill and express a moist and elastic property. As the polyurethane elastic body used here, it is preferable to use polyurethane of polyether type or polyester type whose solid content is about 30 to 40%. In the present invention, since the base material having the alkali treatment is impregnated through the reduction in weight, both polyether and polyester may be used. As the solvent, 4,4'-dimethylformamide, which is generally used, is used. Polyurethane is difficult to be used alone due to its unique viscosity, so it is mixed with a solvent and stirred. At this time, the mixing ratio of the polyurethane and the solvent is 1: 1 to 1: 3 so that the solid content concentration is about 10 ± 3%. It is necessary to use enough stirring for a time and perform a defoaming process to remove air bubbles to prevent pinholes on the finished product.

The amount of polyurethane filling when impregnated is 10 to 40% of the total weight of suede. If the filling amount is less than 10%, the elasticity of hand-held by polyurethane filling is less. It is difficult because the feeling of the polyurethane filler is expressed too strongly rather than the surface effect of. When impregnating the polyurethane with the gap between the upper roller and the lower roller of the mangle to 0.1 ~ 1mm, it is suitable to control the filling amount to the desired degree. After defoaming, the PU solution is squeezed to 90% of the thickness of the after-knitted fabric, transferred to the coagulation bath, and coagulated.

The polyurethane filled circular knitted fabric is dried by a third heat treatment for 80 to 120 seconds at 110 to 130 ° C. in a tenter, but the drying speed is less than 80 seconds, so that a sufficient setting effect is not expressed, resulting in weight and width. If it is not properly expressed, and in excess of 120 seconds, the hard touch of excessive dryness may not be able to express suede-specific effects. The finished fabric is double-sided sanded using sandpaper 150-240 to remove the polyurethane fillers attached to the surface and back of the knitted suede. After the reduction and washing process again in the dyeing machine and washed with a tenter (TENTER) and dried by the fourth heat treatment for 80 to 120 seconds at 110 ~ 130 ℃. This is because the urethane starts to cure when the temperature exceeds 130 ° C. and the touch becomes hard.

The present invention provides suede-like artificial leather rich in elegant filling that can be used as a differentiated product for pouches, jewelry storage bags, electronics storage bags and clothes, without dye dye transfer by disperse dyes, and excellent workability. can do.

The following examples are given as non-limiting examples of producing the suede-like microfiber knitted fabric of the present invention.

Example 1

The final fineness of interlacing polyester split composite yarns with final fineness of 0.25 denier and high shrinking polyester filament (40% non-shrinkage ratio) having 70 denier per meter after metering process A 28-gauge interlock circular letter was prepared using an interlaced yarn of 110 denier. The prepared circular knitted fabric is immediately reduced in an atmospheric pressure reducer using sodium hydroxide (20 g / l) at a concentration of 98% for 20 minutes at 95 ° C. Then, the dye is stained with a disperse dye resistant to polyurethane dyeing at 130 ° C. in a high pressure dyeing machine and then dried by first heat treatment at 190 ° C. for 80 seconds in a tenter. The finished dyeing paper was brushed 8-12 times on the front and back surfaces, respectively, and subjected to second heat treatment at 190 ° C. for 80 seconds. Polyether-based polyurethane having a solid content of 30% and 4,4'-dimethylformamide are impregnated in a diluted polyurethane solution at a ratio of 1: 1.5, solidified by passing through a coagulation bath, and washed sufficiently by passing through a washing tank. After the third heat treatment at 130 ℃ for 100 seconds and dried, sanded both sides with 150 mesh sandpaper, and then reduced washing process by adding 2% by weight of an acidic reducing detergent at 80 ℃, 20 minutes in a liquid dyeing machine, the surface and back In order to remove the brushed residue remaining in the rinse thoroughly in a mangled water washing method, and dried again by a fourth heat treatment for 100 seconds at 130 ℃ finally to produce a 54 inch 300 grams / yard suede artificial leather.

Comparative Example 1

A suede-like microfiber knit fabric was prepared in the same manner as in Example 1, and the product was finished by weight reduction, dyeing, and raising without proceeding with wet polyurethane impregnation.

The characteristics of the process of Example 1 and Comparative Example 1 are shown in Table 1.

division fair Example 1 Dough → reduction → dye → reduction cleaning → heat treatment → napping → heat treatment → PU impregnation → PU coagulation → PU washing → heat treatment → double-side sanding → reduction washing → batch-type mangle washing → heat treatment → test completion Comparative Example 1 Dough → reduction → dye → reduction cleaning → heat treatment → napping → heat treatment → test completion

division Color fastness Daylight fastness Appearance quality Example 1 Grade 4 Class 3.5 Excellent suede feeling Comparative Example 1 Level 3 Level 3 Insufficient suede

Claims (3)

In the manufacturing method of suede-like artificial leather of circular knitting, High shrinkage of single yarn fineness of 1 ~ 4 denier with non-aqueous shrinkage of 20 ~ 50% in either polyester-based islands and split composite yarns composed of eluting component and fiber forming component and having single yarn fineness of 0.03 ~ 0.3 denier after elution Interlacing polyester filament yarns to be used yarns as interlocks or double-layered fabrics, and then reducing, dyeing, reducing washing, first heat treatment, double-sided brushing, second heat treatment, polyurethane impregnation, A method of manufacturing suede-like artificial leather of rich circular knit tissue, characterized in that the third heat treatment, double-sided sanding, reduced washing, batch mangung washing and fourth heat treatment. The method of manufacturing suede-like artificial leather of the circular knitting tissue rich in filling feeling according to claim 1, wherein the circular knitting process is adjusted to gauges 22 to 40 and knitted at 150 to 500 grams / yard of dough. The method of manufacturing suede-like artificial leather of a circular knitting tissue rich in filling feeling according to claim 1, wherein the polyurethane impregnated is impregnated with a gap between an upper roller and a lower roller of 0.1 to 1 mm.