KR100445639B1 - Method for producing washable dyed leather - Google Patents

Abstract

The present invention relates to a method of manufacturing water-washable dyed leather paper, after dyeing the leather paper in a conventional manner, the dyeing of the leather after the pad die, aging treatment, color fixing process and oiling process according to the present invention This is not completely discolored or discolored, and maintains the original state of the natural leather is excellent in the durability of the characteristics of the leather can be used for a long time, after washing the primary color can be used as it is without coating again.

Description

Process for producing washable dyed leather paper {Method for producing washable dyed leather}

The present invention relates to a method of dyeing natural leather, and more particularly, to a method of manufacturing water-washable dyed leather paper by dyeing and padding.

In general, the use of leather paper, clothing, shoes, bags, etc. is actually a wide range.

These leather papers are classified into various forms according to the usages applied to the actual products. That is, a fleshing process for removing the fat layer in the back layer of raw hides and a fertilization process for removing impurities, bacteria, salts, etc. contained in the raw hides and converting them into a hide state, Lithium process removes the roots of finished leather as Sodium Hydroxide (NaHCl ₂ ) and Sodium Emulsion (Na ₂ SO ₄ ) and stretches the leather according to the application. Deliming process to remove the hair root and dirt of the leather after re-liming to give, and to remove the lime component after the re-liming, and the enzyme is administered to the leather after the deliming process to penetrate between the fiber of the leather to facilitate drug administration To increase the tissue, remove the remaining fat of the leather to convert animal fibers into mineral fibers, pickling / chrome tanning process with + trivalent chromium ion, the pickling / chrome tanning process Passing the finished leather through rollers to remove moisture under extrusion, widening the area of leather so that dyes can be added in the dyeing process, and selectively controlling the thickness of the backing layer of the leather, and chrome the finished leather Retanning process to retanning, neutralizing the leather after the retanning process, neutralization process to re-adjust acidity, and hardened leather after the neutralizing process is added to the dyeing drum and then ammonia is used. A dyeing step of administering and dyeing color dyes, a branching step for softening the leather paper in the hard state after the dyeing step), a drying step of drying the finished leather, and a leather finishing the drying step Tanning process to soften and increase the yield of the leather after the tanning process Gluing process, Butting process to select the state of the leather after the tagling process to even the surface and the back portion, Coating process for coloring the desired color on the finished leather after the butting process, and the finished leather It consists of an inspection process of screening and evaluating the quality of the leather which has finished the spraying process of recoloring and spraying a gloss material as a spray or the like, and a shipment process of shipping the leather which has finished the inspection process.

However, the conventional leathers that have completed this process are actually vulnerable to water, which is pointed out as the factor that lowers the reliability most when applied to a product, ie clothes or shoes. For example, if a leather product is relatively rained, water stains will remain on the surface even after it is dried.

Such a decision is pointed out as a weighted problem in which the fibers attached to the body, rather than the surface layer of leather products, are attached to the body.

In addition, the color is not limited to this, the color is washed in the rain, such as when the bleaching agent contained therein is also leaked with the problem that the leather shrinks later.

Conventionally, in order to solve this problem, Korean Patent Application No. 93-4438 discloses a retanning process of retanning leather after shaving process with Aldehyde, and heavy water refining leather after the retanning process (NaHCO2). After neutralizing with CH3COONa for about 2 hours, the process neutralizes for a predetermined time, aging, washing with water, and re-adjusting the acidity. Eggplant process for attaching the fluorinated resin compound to the leather fiber (FIBER), and a heavy metal (Ca + 2, Al + 3, Fe) contained in the mixed leather and water In the heavy metal removal process of removing +2) and the fixing process of waterproofing base, the fixing process made of aluminum instead of chromium, the first drying process of drying the leather after the fixing process, and the first drying process It consists of a second drying step of drying the finished leather again and a third drying step of drying the finished leather again, thereby completely staining the surface of the leather so that water does not penetrate into the leather paper and stain the product. It has been suggested to prevent the occurrence of distortion and to extend the life of the product, which is effective in waterproofing the surface of the leather, while the back layer of the leather is not waterproof so that the colored color is discolored. It is.

In addition, Patent Application No. 1993-8554 discloses a retanning process for retanning the leather after shaving with aldehyde and chrome, and degreasing the natural fat contained in the leather after the retanning process as a surfactant. The degreasing process, the neutralization process of neutralizing the finished leather by using only 3.5-4.5% of NaHCO3, and the formic acid 40 to 70 minutes after dyeing into the dye drum were applied to the finished leather. When the pH is 3.5-3.7, the dyeing process is completely fixed again by using 2% fixing agent, and 16 to 20% of eggplants commonly used on leather paper after the dyeing process is used for 4 to 8% paraffin scallop. There has been proposed a method for producing washable leather paper, which consists of a branched process which proceeds with a two-step process by mixing with chloride.

In the case of dyeing the leather by only dyeing as described above, because the color is weak, the color of the pigmented and adhesive mixture of the same color is coated on the surface of the leather soaked to adjust the color. However, the dyeing leather products prepared by the conventional method is difficult to maintain the circular shape when wet or wet with water in the case of clothing, and the base is expressed, resulting in white stains, shrinkage, etc., the inconvenience of having to coat the surface again after dry cleaning There is, there is a disadvantage in that the re-coating, the surface becomes hard and rough to reduce the quality of the leather.

Therefore, the present invention is to provide a method for producing a dyed leather that does not impair the dyeing quality even in the case of water washing in view of the above problems of the prior art as a technical problem.

In the present inventor's research for solving the above problems, after dyeing leather paper in the usual way, the pad dyeing with the dye solution of the same color is excellent in elasticity, heat resistance and flexibility while maintaining the original color while maintaining the original shape after washing with water. And to know that the stability is excellent to complete the present invention.

Therefore, according to the present invention, in the production of dyed leather paper, after dyeing the leather paper in a conventional manner, the process of pad dyeing (dyed dye) on the surface of the leather paper, the dyeing of the same color as the dyeing, pad dyed leather Process of steaming paper and steaming paper, washing water of aged leather paper, immersing the washed leather paper in an aqueous solution containing a fixing agent and fixing the color, and fixing the color paper to an aqueous solution containing oil and urea. There is provided a method of manufacturing a washable dyed leather paper, comprising the step of dipping.

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

The manufacturing method of the present invention includes a dipping step, a padding step, a aging step, a fixing step, and an immersion step for oil application.

The dyeing process is commonly used for dyeing leather paper. The dyeing process is mainly performed by immersing the leather paper in a rotating drum containing dye solution and rotating the dyeing paper, followed by fixing.

Since the color is weak when dyed with only such dyeing, in order to compensate for this, in the present invention, padding is performed on the surface of the dyed leather paper. The dye used for padding is preferably the same color as the dye used for dyeing, and it is preferable to use a mixture of dyes and a dye such as corn starch.

The padded leather paper is immersed to impart oil after aging and sticking to prevent the dye from leaving.

The aging treatment is carried out by steaming padded leather paper, but not particularly limited, but the aging treatment is carried out for about 60 minutes after adjusting the leather paper to about 86 ° C. After aging, the water is washed and then drained and sent to the next fixing process. It is preferable to use what added surfactant or detergent for washing water.

In the fixing process, the color is fixed by immersion in an aqueous solution containing a fixing agent. Although not particularly limited, as the fixing agent, acetic acid and oleic acid are preferable, and to prepare an aqueous solution containing such fixing agent, it is preferable to mix 4% acetic acid solution and 6% oleic acid solution in hot water. . This fixation process reduces color from acid to protein fibers and simultaneously fixes color.

Color-fixed leather paper is impregnated with an oil and urea-containing aqueous solution. At this time, the oil acts to replenish the protein and the urea acts to keep the oil given to the leather. Preferred examples of such oils include turkish red oil.

The dyed leather paper after such processes are dried, dried and milled according to the conventional method, and then clear coated and iron pressed according to the purpose to complete the dyed leather.

Hereinafter, the present invention will be described by way of examples.

EXAMPLE

After adding 8% solution of acid dyestuff of the desired color to 40 ℃ water in rotating drum, and administering leather paper, rotate it for 20 minutes, and add dye solution to increase the color density when dyeing. The temperature was raised to 60 ° C. and rotated for 40 minutes. After that, acetic acid was added to 6% of the volume of water, and ammonia water was added to 4% of the volume of water, rotated for 20 minutes. Naturally dried.

After dyeing the pads with a dye solution containing acidic water-soluble dyes and corn starch in a weight ratio of 2: 8 on the surface of the leather paper, and dried naturally.

Padded leather paper is placed in a steamer, adjusted to 85 ° C, and aged for 60 minutes. After the aging treatment was completed, the leather was washed with detergent-washed water and then drained.

Next, the paper was fixed by immersing the leather paper in a rotating drum containing an aqueous solution obtained by adding 6% acetic acid solution and 4% oleic acid solution to water at 40 ° C.

After the process was completed, the leather paper was drained and placed in a rotating drum containing an aqueous solution of 40 ° C. containing 6% of Turkish red oil and 4% of urea.

Next, the leather paper was drained, dried naturally, milled, and then ironed after clear coating to prepare dyed leather paper.

Washing fastness (KS M 6888 9.3.1: 40 ° C, 30 minutes, 0.2% sodium lauryl sulfate) friction fastness (KS K 0650), dry cleaning fastness (KS M 6888) 9.3.2), daylight fastness (KS K 0700: fadeometer, by standard blue dye, 40 times or more) and water fastness (KS K 0645: perspirometer method) were measured. The measurement results are shown in Table 1 below.

Test Items Test result Sample 1 Sample 2 Color fastness to washing (grade) Fading 4-5 4-5 Contamination (Acetate) 4-5 4-5 Pollution (Cotton) 4-5 4-5 Pollution (nylon) 4-5 4-5 Contamination (polyester) 4-5 4-5 Pollution (Acrylic) 4-5 4-5 Pollution 4-5 4-5 Friction Fastness (Grade) dry 4-5 4-5 Wetting 4-5 4-5 Dry cleaning fastness (grade) Fading 4 4 Contamination (Acetate) 4-5 4-5 Pollution (Cotton) 4-5 4-5 Pollution (nylon) 4-5 4-5 Contamination (polyester) 4-5 4-5 Pollution (Acrylic) 4-5 4-5 Pollution 4-5 4-5 Daylight Fastness (Grade) 3 4 or more Water Fastness (Grade) Fading 4-5 4 Contamination (Acetate) 4-5 4-5 Pollution (Cotton) 4-5 4-5 Pollution (nylon) 4-5 4-5 Contamination (polyester) 4-5 4-5 Pollution (Acrylic) 4-5 4-5 Pollution 4-5 4-5

The dyed leather of the present invention prepared by the method as described above is completely dyed leather is not discolored or discolored, the natural leather of the leather by maintaining the original state

It has excellent durability, which can be used for a long time, and after washing, it is possible to maintain the primary color as it is and use it without coating again.

Claims (5)

In the production of dyed leather paper, the process of dyeing the leather paper in a conventional manner, and then pad dyeing the surface of the leather paper, the dyeing of the same color as the dyeing, steamed padding leather paper Processing, washing the aged leather paper, immersing the washed leather paper in an aqueous solution containing a fixing agent, fixing the color, and immersing the colored paper in an aqueous solution containing oil and urea. Method for producing a washable dyed leather, characterized in that. The method for producing water-washable dyed leather according to claim 1, wherein the water used for washing with water after aging is water to which a surfactant or detergent is added. The method for producing water-washable dyed leather according to claim 1, wherein the fixing agent used for color fixing after the aging treatment is a mixture of acetic acid and oleic acid. The method of claim 1, wherein the oil is turquoise red oil. The method of claim 1, wherein the padding dye contains corn starch and acidic water-soluble salts.