KR20110062330A - Method for manufacture of natural leather with black color using natural dyes - Google Patents

Abstract

PURPOSE: A method for manufacturing natural leather with black color is provided to reduce environmental influence values generated from leather effluent by dyeing natural leather using natural dyes. CONSTITUTION: A method for manufacturing natural leather with black color comprises: a dye addition process (P100) for injecting natural dyes into natural leather passed through a tanning process, a retanning process, and a neutralizing process; a mordant process(P200) for injecting a metallic mordant into the natural dye to form a complex compound; and a fatliquoring process(P300) for inducing additional surface adsorption of a natural dye complex compound by adding anionic fatilquor to an solution acidified by forming the natural dye complex compound.

Description

Method for manufacture of natural leather with black color using natural dyes}

The present invention relates to a method for producing a natural leather having a black color using a natural dye, and more specifically, multi-coloring at the time of dyeing the natural leather through a tanning process, a retanning process and a neutralization process, which is a conventional manufacturing process of natural leather. Natural leather having a black color by using gall bladder or joiner, which is a natural dye, has excellent color and dyeing characteristics than natural leather dyed with synthetic dyes, and the color is beautiful and is an environmentally friendly method that is harmless to humans. It relates to a method for producing natural leather having a black color using a dye.

At present, most natural leather processing and manufacturing process is carried out dyeing process using synthetic dyes, and the wastewater generated in the process is very high in BOD and COD, and due to the generation of non-degradable malignant wastewater containing heavy metals, environmental pollution problem Is seriously on the rise. In addition, due to the problem of poor compatibility of the human body by the compound of synthetic dyes used for dyeing of natural leather, causing various skin rashes and allergies or dermatitis, it may cause fatal risks to the human body for the elderly and children with weak skin tissue. Cases of adverse events are often reported.

Therefore, in order to meet the needs of consumers who prefer eco-friendly and harmless products to prevent the above problems, natural leather processing and manufacturers use synthetic dyes such as azo dyes, carcinogenic dyes and allergic dispersion dyes. Although natural leather has been manufactured by excluding as much as possible, there have been problems in that various skin diseases including atopic dermatitis occur even by the use of general synthetic dyes for infants and the elderly who are sensitive to the skin.

As a technology developed to solve the above problems, when looking at the dyeing method using natural dyes, Korean Patent Laid-Open Publication No. 2004-0006250 and 1999-007624 dyeing process for imparting color to leather and fabric Has been proposed to give a variety of colors by applying natural dyes instead of synthetic dyes, Korean Patent Publication No. 2008-0003284 and 2006-0012921 is a method of natural dyeing using persimmon and pear, which is a natural material Dyeing method has been proposed for the fabric by using a single, and other methods of natural dyeing on the fabric using known in Korea Patent Publication Nos. 2005-0116552 and 2006-0082777 are known as the above, In the case of methods, there is no information on the manufacturing method of black color, which is in demand in leather products due to the dyeing process by the color of natural dye itself. All.

Looking at the conventional method of manufacturing natural leather, raw materials (Raw materials) is manufactured through a preparatory process, tanning process, dyeing process, coating process. The preparation process is a process of removing raw hair, fat, soluble protein, etc. necessary for leather production under alkaline conditions by inputting the raw material blood, and the tanning process is tanning agent such as collagen protein and chromium, vegetable, aluminum, and aldehyde. It is a process to make a stable fiber structure by reacting. Through this process, dyeing process, which is one of the important factors to determine the product value by giving various colors and flexibility to the leather, according to the merchandise and consumer's desire of natural leather products, is carried out. Depending on the propensity to proceed the painting process.

The conventional dyeing finished natural leather is mostly dyed with synthetic dyes, there is no beauty of the beautiful color, hardly decomposable malignant wastewater is generated during the production of synthetic dyes, and the dye and unreacted dyes of the leather in the dyeing process of natural leather In case of exiting the waste water, there is a problem of rapidly increasing the environmental impact value of the leather manufacturing process, and there is also a problem that skin allergies occur in the case of infants and the elderly with soft skin.

Therefore, the present invention is a chromium-based tanning agent or non-chrome when tanning in oily process during the manufacturing process of natural natural leather for the production of black color leather using the gall bladder and joiner, which are multicolored natural dyes that vary in color by the addition of mordant. The felt treated with the tanning agent is subjected to the Retanning process and the Neutralize process, and then used in the dyeing process, which is a multicolored natural dye, gallant, joiner, iron mordant and anionic eggplant. By manufacturing a leather having a black color by natural dyes, by developing a manufacturing method of natural leather dyed with black color using the gall bladder and joiner, which is an environmentally harmless natural dye, which is an environmentally harmless natural dye. The present invention has been completed.

Therefore, the present invention is to solve the problems as described above, but caused problems such as skin diseases caused by skin irritation and environmental pollution due to chemically synthesized dyes by dyeing with conventional synthetic dyes. By dyeing natural leather using natural dyes that are harmless to the human body, it is an environmentally friendly method that can reduce the environmental impact value generated from leather wastewater because no environmental pollution occurs during the dyeing process. An object of the present invention is to prepare a natural leather having a black color.

In addition, the present invention overcomes the limitation of color that is the limitation of natural dyeing by developing a dyeing technique of black color that is impossible to give color in natural dyeing, and penetrates into the leather again unreacted natural dyes by mordant and anionic eggplant, By combining and adsorbing, the product has a black color using a natural dye, characterized in that the product can be added high value by a beautiful color with excellent color and dyeing property compared to the black color leather manufactured by a conventional synthetic dye. The manufacturing method of natural leather is another subject.

The present invention for solving the above problems in the method of manufacturing a natural leather having a black color,

A dye injection process (P100) for introducing a natural dye into the natural leather which has undergone the tanning process, the retanning process and the neutralization process;

The natural dye added in the above is a embedding process (P200) for introducing a metallic mordant to form a complex compound;

A branching step of inducing an additional surface adsorption of the natural dye complex compound by injecting an anionic branching agent onto the acidified solution by the formation of the natural dye complex compound (P300);

The manufacturing method of the natural leather which has an environmental / human-friendly black color characterized by being manufactured through is made into a problem solving means.

However, in the present invention, the dye input step (P100) is 100 to 100 parts by weight of natural leather, 100 parts by weight of water and 1 to 10 parts by weight of natural dyes sequentially put, while maintaining a temperature of 35 ~ 50 ℃ 8 ~ 15rpm It is preferable to rotate the drum at a speed of 1 to 10 minutes,

The embedding process (P200) is based on 100 parts by weight of natural leather, 0.5 to 10 parts by weight of a metallic mordant, mixed with a natural dye on a solution to maintain a pH of 2 to 4 range, maintaining a temperature of 35 ~ 50 ℃ While rotating the drum for 30 to 120 minutes at a speed of 8 ~ 15rpm so that the natural dye complex compound is sufficiently dissolved in the solution to be adsorbed, bonded, and penetrated with the natural leather,

The eggplant process (P300) is based on 100 parts by weight of natural leather, 5 to 20 parts by weight of anionic eggplant agent while maintaining the temperature of 35 ~ 50 ℃ while rotating the drum for 60 to 180 minutes at a speed of 8 ~ 15rpm It is preferable that the unreacted natural dye complex of the phase induces additional adsorption and flexibility of the natural leather on the surface of the natural leather,

And it is preferable to use one of the natural dyes selected from gallastia or joiner.

The present invention by the above-mentioned means for solving the problem has caused problems such as skin diseases caused by skin irritation and environmental pollution by chemically synthesized dyes by dyeing with conventional synthetic dyes. By dyeing natural leather with natural dyes, that is, harmless human body dyes, the environment is not generated at all during the dyeing process. Therefore, the environmental impact level generated from leather wastewater can be reduced. It is an eco-friendly construction method.

In addition, by developing the dyeing technology of black color, which is impossible to give color in natural dyeing, it overcomes the limitation of color that is the limitation of natural dyeing, and penetrates, binds and adsorbs the unreacted natural dyes into leather again by mordant and anionic eggplant. By using it, it is possible to make high value-added product by beautiful color with superior color and dyeing property compared to the black color leather manufactured by conventional synthetic dyes, and can be utilized as leather material for shoes, bags, clothes, and furniture. In addition, the scope of application is expected to expand significantly and demand is expected to increase.

Referring to the configuration of the present invention for achieving the above effect in detail as follows. In the following description, only parts necessary for understanding the method of manufacturing natural leather having a black color using a natural dye, that is, dyeing using the natural dye according to the present invention are described, and the description of other parts scatters the gist of the present invention. Note that it will be omitted so as not to fall short.

And the term "felt" in the terms described in the specification of the present invention is a state of manufacture of leather that is different from the leather (Leather) used in the sentence, chrome tanning agent or non-chrome tanning agent (Non chrome) It is found that the tanning agent is different from the leather dyed with the tanning process and the retanning process. In addition, chrome tanned leather is used in the tanning process by using chromium-containing materials to convert animal proteins into mineral proteins, giving them heat resistance and flexibility.Chromium-free tanning agents aluminum, zirconium, titanium, aldehyde It is noted that this leather is a different type of leather from tanning agent such as vegetable tanning agent.

In addition, it should be understood that the terms 'leather' and 'leather' in the description of the specification of the present invention are used interchangeably in some contexts for convenience of context in front and back paragraphs.

Hereinafter, the configuration of the present invention will be described in detail with reference to FIG.

In the present invention, Figure 1 relates to a process block diagram showing a natural leather manufacturing process having a black color using a natural dye according to the present invention.

The present invention is a method for producing a natural leather having a black color,

A dye injection process (P100) for introducing a natural dye into the natural leather which has undergone the tanning process, the retanning process and the neutralization process;

The natural dye added in the above is a embedding process (P200) for introducing a metallic mordant to form a complex compound;

A branching step of inducing an additional surface adsorption of the natural dye complex compound by injecting an anionic branching agent onto the acidified solution by the formation of the natural dye complex compound (P300);

Through it is characterized in that the natural leather with an environmental / human-friendly black color is produced.

The present invention is a dyeing process after the natural pellets treated with a chrome tanning agent or a non-chrome tanning agent during the tanning process in the planetary process of the natural leather after the normal retanning process and neutralization process By expressing the black color by using a natural dye or gallenger, it is a dye with environmentally friendly, environmentally friendly properties harmless to the human body, superior color and dyeing amount compared to the natural color of black leather produced by conventional synthetic dyes It is characterized by beautiful color as a characteristic.

The dye injection process (P100) according to the present invention is a process of imparting a variety of colors to the leather produced through the preparation, tanning, retanning and neutralization process of the raw leather (Raw mateirals) state, Natural dyes used are multicolored natural dyes, such as gall bladder or joiner, which are discolored to black color by the addition of iron mordant, and 100 parts by weight of water and 100 parts by weight of water and 1 to 10 parts by weight of polychromatic natural dyes are sequentially In the mixed state to maintain the temperature inside the drum at 35 ~ 50 ℃, the rotation speed of the drum is rotated within about 1 ~ 10 minutes at 8 ~ 15rpm to ensure that the 5 g of a natural dye or joiner is sufficiently dissolved in the drum It is preferable.

In the case of gall and joiner introduced above, there is a concern that the leveling properties of the leather may be lowered if it is not sufficiently dissolved in the leather. If the amount thereof is small, the dye may not be given a bright black color due to the binding of the mordant.

In addition, when the amount of the natural dyes used are five times or small amounts of joiners, there is a concern that the color becomes more light than the amount of mordant can bind.

In addition, the mortaring process (P200) according to the present invention forms a complex compound with a hydroxyl group (-OH) of a natural dye dissolved in a drum and shows a black color. The mortaring process is a metallic mordant with respect to 100 parts by weight of natural leather. 0.5 to 10 parts by weight of a phosphorus iron mordant is added to maintain the pH in the range of 2 to 4 in a mixed state with natural dyes in solution, and natural dyes by rotating about 30 to 120 minutes at 8 ~ 15rpm at a temperature of 35 ~ 50 ℃ It is desirable that the phosphorus gall or joiner and mordant are sufficiently dissolved in solution to adsorb, bind and penetrate the leather.

In addition, the branching process (P300) of additionally adsorbing the mordant combined with the flexibility of the natural leather and the non-bonded natural dye according to the present invention, based on 100 parts by weight of the natural leather put into the drum, 5 to 20 weight of anionic branching agent In the mixed state with natural dyes and iron mordant in the solution, the temperature inside the drum is maintained at 35 to 50 ℃, the rotation speed of the drum is rotated within 60 to 180 minutes at 8 ~ 15rpm, unreacted natural It is desirable to induce further adsorption of dyes, iron mordants to the surface of the leather.

In the case where the amount of the natural dyes or the added amount of the joiner is less than the above-defined range, the combined amount of leather and natural dyes and the condition of complexation of mordant and natural dyes do not meet, so that the uneven color of the leather surface and navy blue ( Navy blue) color, and if it is mixed in the above-mentioned range, the economical efficiency is lowered due to the increase in the production cost of the product. There is a risk of light black color.

In addition, the natural dye is preferably applied to select one of the five folds, joiner, and when using a mixture of the two, the problem of poor homogeneity occurs, and other leather chemicals are those with ordinary leather manufacturing knowledge This general purpose drug is not limited to a specific product and can be used regardless of its kind to a drug having an equivalent property or more.

Hereinafter will be described in detail based on the preferred embodiment of the present invention, the present invention is not limited by the embodiment. In particular, the present invention is found to be applicable to the overall process of leather products.

(Example 1)

100 parts by weight of water is added to 100 parts by weight of natural leather to the finished tanning, retanning, and neutralization process, and then 5 parts by weight of a polychromatic natural dye, 5 parts by weight, is mixed and the temperature inside the drum is 50 ° C. Rotational speed of the drum is rotated about 5 minutes at 10rpm to ensure that the five folds are sufficiently dissolved in the drum, and then 2 parts by weight of iron mordant, a metal mordant, is mixed with natural dyes in solution, and the pH is in the range of 3 Rotate the drum for 60 minutes at 10rpm at the temperature of 50 ℃, so that the natural dyes, gall and mordant are sufficiently dissolved in the solution to adsorb, bind and penetrate the leather. Add the water and keep the temperature inside the drum at 50 ℃ while mixing with natural dye and iron mordant in the solution.The drum rotation speed is 10rpm for 120 minutes. I by the leather was prepared with unreacted natural dye, a black color with a gallnut to induce the additional adsorption of iron mordant to the surface of the skin on the solution.

(Example 2)

A natural leather having a black color was prepared by the same method as in Example 1. However, the material for the color imparting used in Example 2 was used to produce natural leather showing a black color using the joiner instead of gall bladder.

The natural dyes, gall, and joiner used a water-soluble type that is soluble in water prepared by a conventional manufacturing method and is not limited to a specific product.

(Comparative Example 1)

Treated by the same method as in Example 1, but using a metal mordant, an iron mordant, a mordant step in which a hydroxy group (-OH) of a natural dye and a metal mordant form a complex compound is not carried out. Only the process proceeded to produce natural leather.

(Comparative Example 2)

In the same manner as in Example 2, but using a metal mordant, an iron mordant, a mordant process in which a hydroxy group (-OH) of a natural dye and a metal mordant form a complex compound is not carried out. Only the process proceeded to produce natural leather.

Surface changes of Examples 1 and 2 and Comparative Examples 1 and 2 are as shown in Table 1 below.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Surface change

As a result of evaluating color difference and K / S (dyeing amount) for Examples 1 and 2 and Comparative Examples 1 and 2, the contents of Table 2 are as follows.

division L, a, b value K / S value Example 1 L: 20.14 a: 0.66 b: -1.88 16.02 (540 nm) Example 2 L: 19.96 a: 0.82 b: -0.03 16.31 (500 nm) Comparative Example 1 L: 63.35 a: 5.45 b: 20.79 4.07 (400 nm) Comparative Example 2 L: 33.39 a: 38.69 b: 18.14 4.68 (400 nm)

week
(-) ← L → (+) (-) ← a → (+) (-) ← b → (+) Lightness decrease Lightness increase   Green red       Blue yellow

According to the above [Table 1], Examples 1 and 2 according to the present invention are superior to Comparative Examples 1 and 2 when the iron mordant is added after the dye injection process is carried out using each of five natural dyes and a small seedling. By showing black color, the excellence could be proved.

According to the above [Table 2], Examples 1 and 2 according to the present invention had a dark characteristic in the (-) direction compared to Comparative Examples 1 and 2 in the L value measurement indicating the degree of black color. In addition, compared to Comparative Examples 1 and 2, the a and b values of Examples 1 and 2 were generally black due to the characteristics of the process proceeding in the (-) direction. In particular, as a result of measuring the K / S value for measuring the dyeing amount of the dyes, in the case of Examples 1 and 2, the natural leather embedded in the gall bladder and joiner shows 16.02 and 16.31, Comparative Example 1, The dyeing amount was about 4 times higher than that of 2. Accordingly, in Examples 1 and 2, the unreacted dye was reduced by increasing the dyeing amount of the dye and the surface color of the leather showed black characteristics, thereby demonstrating its superiority.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated.

1 is a process block diagram showing a black color natural leather manufacturing process using a natural dye according to the present invention.

Claims (5)

In the manufacturing method of natural leather having a black color, A dye injection process of introducing a natural dye into the natural leather which has undergone the tanning process, the retanning process and the neutralization process; The natural dye added in the above is a embedding step of injecting a metallic mordant to form a complex compound; A branching process of inducing an additional surface adsorption of the natural dye complex compound by injecting an anionic branching agent onto the acidified solution by the formation of the natural dye complex compound; Method for producing a natural leather having an environmental / human-friendly black color characterized in that it is produced through. The method of claim 1, The dye injection process is based on 100 parts by weight of natural leather, 100 parts by weight of water and 1 to 10 parts by weight of natural dyes sequentially, while maintaining the temperature of 35 ~ 50 ℃ drum for 1 to 10 minutes at a speed of 8 ~ 15rpm Method of producing a natural leather having a black color of the environment / human-friendly, characterized in that for rotating. The method of claim 1, The embedding process is based on 100 parts by weight of natural leather, 0.5 to 10 parts by weight of a metallic mordant, mixed with natural dyes on a solution and then maintained a pH of 2 to 4 range, while maintaining a temperature of 35 ~ 50 ℃ 8 ~ Manufacture of natural leather with environment / human friendly black color by rotating drum at 15rpm for 30 ~ 120 minutes so that natural dye complex compound is sufficiently dissolved in solution to adsorb, bind and penetrate natural leather. Way. The method of claim 1, In the eggplant process, 5 to 20 parts by weight of anionic eggplant is added to 100 parts by weight of natural leather, while maintaining a temperature of 35 to 50 ° C. while rotating the drum at a speed of 8 to 15 rpm for 60 to 180 minutes for unreacted solution phase. Method of producing a natural leather having an environmental / human-friendly black color, characterized in that the natural dye complex compound induces additional adsorption and flexibility of the natural leather on the surface of the natural leather. The method according to any one of claims 1 to 5, The natural dye is a manufacturing method of natural leather having an environmental / human-friendly black color, characterized in that it is a gall bladder or joiner.

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