KR101600861B1 - Method for producing multi-layer discolorable thermosensitive leather - Google Patents

Abstract

The present invention relates to a method for producing a multi-layer discolorable thermosensitive leather. More specifically, in the coating process of natural leather, when the base coating and the medium coating are applied together with the antifouling agent with the antifouling agent having different discoloration temperature, unlike the natural leather having a simple single color, it actively reacts to the external environment, It is possible to realize a three-dimensional multi-layer color by sequentially exhibiting two or more kinds of discoloration characteristics and to perform base coating and medium coating by mixing a thermosensitive material and an antifouling agent in a coating process and additionally coating an antifouling agent during top coating, The present invention relates to a method for producing a multi-layer discolorable thermosensitive leather.
To this end, the present invention provides a method of manufacturing a color image, comprising the steps of: (a) a basic painting step of applying a mixture containing a white pigment to a leather surface using crust leather to produce a base color as white; And (b) coating a mixture of a thermosensitive material and an antifouling agent on the white crust leather prepared in the step (a), wherein the temperature-sensitive material of each layer is different in temperature discoloration range to realize multilayer discoloration A process for producing a multi-layer discolorable thermosensitive leather including the present coating process is provided.

Description

METHOD FOR MANUFACTURING MULTILAYER COLORECTURAL TEMPERATURE LEATHER

The present invention relates to a method for producing a multi-layer discolorable thermosensitive leather. More specifically, in the coating process of natural leather, when the base coating and the medium coating are applied together with the antifouling agent with the antifouling agent having different discoloration temperature, unlike the natural leather having a simple single color, it actively reacts to the external environment, It is possible to realize a three-dimensional multi-layer color by sequentially exhibiting two or more kinds of discoloration characteristics and to perform base coating and medium coating by mixing a thermosensitive material and an antifouling agent in a coating process and additionally coating an antifouling agent during top coating, The present invention relates to a method for producing a multi-layer discolorable thermosensitive leather.

Due to its unique color, texture and luxury, leather materials are widely used not only in daily necessities such as bags, shoes, clothing, accessories, but also in automobiles, airplanes, marine interior materials, furniture, packing for seals and so on.

[Background Art] [0002] In recent years, there has been a demand for a leather material having a special surface effect as a consumer's desire for fashion has diversified. However, as a technique to cope with this, a simple color is imparted by dyes or pigments, embossing, It is in a state of being on the back.

Attempts have been made to apply a thermosensitive functional material to non-leather common fibers, but this also exposes problems such as low durability, discoloration, and uneven discoloration.

In order to solve such a problem, KR Patent Publication No. 1995-0007811 (Publication No. 1995.20.20, publication "First Prior Art") discloses a method for producing a photochromic fiber, An amount of an ultraviolet absorber added, and a fineness of a monofilament of a manufacturer in an appropriate range, thereby producing a photosensitive reversible discoloring fiber. However, the first prior art has a limitation in that it is difficult to apply photochromic raw materials, auxiliary agents, and the like to the coating process of natural materials such as leather by directly producing fibers by adding fibers in the fibers during fiber production.

On the other hand, in KR Patent Publication No. 1996-0011898 (Announcement No. 4, September 4, 1996, hereinafter referred to as "the second prior art"), a fiber whose color changes with temperature change, And a transparent synthetic resin containing an ultraviolet absorber to form a film on the surface of the fiber. However, the second prior art has a problem in that it is difficult to permanently adhere the thermosensitive material by the immersion method, and the coating with the fibrous coating is applicable only to the synthetic fibers, which is not suitable for the natural leather manufacturing process.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method of producing a leather- And an object of the present invention is to provide an excellent natural leather manufacturing method.

In order to accomplish the above object, the present invention provides a method for producing a multi-layer discolorable thermosensitive leather according to the present invention, which comprises: (a) applying a mixture containing a white pigment to a leather surface using crust leather, A basic painting process; And (b) coating a mixture of a thermosensitive material and an antifouling agent on the white crust leather prepared in the step (a), wherein the temperature-sensitive material of each layer is different in temperature discoloration range to realize multilayer discoloration And the present coating process.

The white pigment in the mixture containing the white pigment in the step (a) may be used in an amount of 0.1 to 70% by weight of the total mixture, and the step (a) may be repeatedly performed 1 to 5 times.

The step (b) may further comprise: (b1) a base coating step of treating the thermosensitive material having a temperature discoloring range of 26 to 35 degrees Celsius with 0.1 to 50 wt% of the entire mixture; (b2) a medium coating step of treating the thermosensitive material having a temperature discoloring range of 15 to 25 degrees Celsius with 0.1 to 50 wt% of the whole mixture after the step (b1); And (b3) a top coating step in which the mixture containing the antifouling agent is coated after the step (b2).

The antifouling agent can be applied to the base, medium, and top coating processes using 0.1 to 50% by weight of one or more kinds of fluorine or silicon antifouling agents selected and mixed.

Further, the thermosensitive material may be an organic-based thermochromic coloring matter pigment, such as diphenyl aminophenol, terephthaloyl acetanilide, triphenyl methane, fluorene, Black, Yellow, Blue, Red, Purple, Green and Orange may be selected and used.

According to the present invention, by applying the antifouling agent together with the antifouling agent, the antifouling agent is coated with the antifouling agent having different discoloration temperatures in the base coating and the medium coating in the coating process of the natural leather, so that unlike the natural leather having a simple single color, And three or more multi-layer colors can be realized by sequentially exhibiting two or more kinds of discoloration characteristics.

In addition, according to the present invention, the antifouling effect can be improved by mixing the antifouling agent with the thermosensitive material in the painting process to perform the base coating and the medium coating, and additionally coating the antifouling agent during the top coating.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

The multi-layer discolorable thermosensitive leather according to the present invention is prepared through a preparatory process, an oily process, a dyeing process and a coating process using raw hides of natural leather such as cow, pig, sheep and the like.

The preparation process is a step of performing watery, lime, demineralization, betting and pickling. Specifically, the preparation process includes a water treatment which treats raw hides with a salty dressing to compensate for lost water, a lime treatment to remove hair through alkalization, a deliming treatment to remove the lime removed, A betting treatment for increasing the yield, and a pickling treatment for adjusting the leather to acidic to homogenize the input of the tanning agent.

The oily process is a step of performing a tanning process. Specifically, the oily process is a process for imparting minerality to an animal for commercialization of leather, and includes a tanning treatment imparting heat resistance and flexibility.

The dyeing process includes a wet process including retanning, neutralization, fatliquoring and dyeing processes, and a coating process including a base, a medium and a top coating, (Dry Process, Finishing Process). Hereinafter, the coating process will be described as a separate process separately from the dyeing process.

Specifically, the dyeing process is difficult to secure a filling feeling when the tanning agent is dried only by the tanning agent alone. Therefore, flexibility and resilience, retanning treatment for obtaining a feeling of filling of leather, and pH increase for easy penetration of dye, Neutralization treatment, dyeing step, and branching and drying treatment to give flexibility and elasticity.

The painting process is the final step in determining the merchantability of the leather. It is the process of mixing the water, the binder, the wax, the lacquer, the auxiliary agent, the pigments and the dye (Dye) , And a top coating process.

In the present invention, Crust leather, which has been subjected to a drying process after a tanning process, is used in the coating process. The crust leather is coated with a thermo-chromic material and an antifouling agent in a base and a medium coating process, The antifouling agent is applied in the coating process to produce the multi-layer discolorable heat-sensitive leather.

Specifically, in the method for producing a multi-layer discolorable thermosensitive leather according to a preferred embodiment of the present invention, the coating process includes a basic coating process and a main coating process.

The basic painting process is a process of applying a white pigment to a leather crust to paint a base color in white. In the basic painting process, it is preferable to treat the white pigment treated on the leather surface with about 0.1 to 70% by weight of the total paint chemical composition in order to increase the discoloration efficiency before the heat-sensitive material is treated in the painting process.

If the amount of the white pigment used is less than 0.1 wt%, the whiteness and surface hiding properties of the leather are insufficient, resulting in deterioration of the quality of the leather and sharpness of color upon discoloration. When the amount exceeds 70 wt% Resulting in a problem of lowering of physical properties.

In this painting process, a base, medium, and top coating are performed by mixing a cushion of a leather treated with a white background color (background color) and a thermosensitive material and an antifouling agent.

This painting process is a process of coating natural leather with thermo-chromic material and antifouling chemicals in the painting process and spraying paint on the surface of leather through spraying, padding, roll coating, (Coating) treatment, it reacts actively with the external environment unlike the existing discolorable natural leather having simple color, so that the discoloration characteristics of two or more paper colors are sequentially obtained from the surface of the coating.

In the base coating and the medium coating, the temperature sensitive material is preferably treated using approximately 0.1 to 50% by weight of the total coating chemical composition. Further, in the base coating, a thermosensitive material having a temperature discoloring range of about 26 to 35 degrees is treated, and in the case of a medium coating, a thermosensitive material having a temperature discoloring range of about 15 to 25 degrees is treated .

If the use amount of the thermosensitive material is less than 0.1% by weight in the base coating and the medium coating, it is difficult to impart a proper color to the leather surface. If the usage amount exceeds 50%, the adhesion of the functional material to the leather surface is deteriorated, And the manufacturing cost is increased.

When the thermosensitive material exceeding 35 ° C is applied to the base coating, the multi-layer discoloration characteristic due to body temperature is remarkably decreased. When the thermosensitive material exceeding 25 ° C is applied in the medium coating, .

Base-coated and medium-coated thermochromic materials are organic-based thermochromic pigments such as diphenylaminophenol, terephthaloyl acetanilide, triphenylmethane, fluorene, Choose one or more colors of material Black, Yellow, Blue, Red, Purple, Green, Orange, etc. .

On the other hand, in the base coating and the medium coating, the thermosensitive material may be mixed with the antifouling agent in the form of a slurry or a powdery thermosensitive material microcapsule.

Also, it is preferable to apply 0.1 to 50% by weight of a fluorine-based or silicone-based antifouling agent in a base, medium, and top coating process in order to impart stain resistance in the treatment of the thermosensitive material.

When the amount of the antifouling agent is less than 0.1 wt%, the antifouling effect is insufficient and it is difficult to exhibit the effect of improving the stain resistance. When the amount of the antifouling agent is more than 50 wt%, the surface durability is weakened due to the characteristic of the antifouling agent, Problems may arise.

In the top coating process, it is preferable to apply the antifouling agent in an amount of 0.1 to 50% by weight in order to protect the lower layer (base coating layer, medium coating layer) and improve the stain resistance.

When the amount of the antifouling agent is less than 0.1 wt%, the effect of improving the stain resistance is insignificant. When the amount of the antifouling agent used is more than 50 wt%, problems of poor adhesion and lowered profitability due to overuse of the drug may occur.

The multi-layer thermochromic coloring structure used in the present invention can impart various colors in accordance with the needs of the consumer in the coating process and has a high discoloration property and stain resistance at various temperatures to produce a leather product of high added value .

Further, the multi-layer discolorable heat-sensitive leather manufactured by the present invention can be applied to various fields such as clothes, bags, shoes, accessories, and interior materials of various transportation equipment such as automobiles, airplanes, trains, and ships.

Hereinafter, examples and comparative examples of the present invention and their physical property evaluation results will be described.

1. Manufacture of multilayer discolorable heat-sensitive leather

[Example 1]

To improve whiteness in chrome tanned crust leather, 300 g of water, 150 g of a urethane binder, 250 g of an acrylic binder, 200 g of a white pigment, 50 g of a wax, And 50 g of Leveller were sprayed on the mixture, followed by drying at 60 ° C for 2 hours to obtain leather having improved whiteness.

In the base coating, 200 g of water, 150 g of a urethane binder, 250 g of an acrylic binder, 200 g of thermo-chromic materials, 100 g of antifouling agent, 50 g of wax And 50 g of a leveler were coated by a spraying method and then dried at 60 ° C. for 2 hours. The coating was repeated four times. In a medium coating, 200 g of water, a urethane binder, 250 g of acrylic binder, 200 g of thermo-chromic materials, 25 g of anti-fouling agent, 50 g of wax and 50 g of leveller were mixed and sprayed through a spraying method And then dried at 60 ° C for 2 hours. The top coating was repeated with 400 g of water, 500 g of Nitro cellulose lacquer and 100 g of antifouling agent. The process of time drying A natural leather was prepared having the discoloration degree for.

[Example 2]

In Example 2, 200 g of water, 150 g of a urethane binder, 250 g of an acrylic binder, and 100 g of an acrylic binder were mixed in a base coating in the same manner as in Example 1, A process of mixing 200 g of thermo-chromic materials, 100 g of antifouling agent, 50 g of wax and 50 g of leveller, spraying, and drying at 60 ° C. for 2 hours Was repeated four times. In a medium coating, 200 g of water, 250 g of a urethane binder, 150 g of an acrylic binder, 200 g of thermo-chromic materials of 25 DEG C, 100 g of antifouling agent , 50 g of wax and 50 g of leveller were sprayed and spray dried for 2 hours at 60 ° C. The top coating was repeated 500 g of water, Nitro cellulose lacquer And then dried at 60 ° C for 2 hours to prepare a natural leather having color changeability with respect to temperature.

[Comparative Example 1]

A natural leather having increased whiteness was prepared by the same method as in Example 1 except that only 31 ° C. thermo-chromic materials were used in the base coating and the medium coating process, Natural leather having color changeability with respect to the temperature produced by the painting process except for the antifouling agent was used as Comparative Example 1 which is a control.

2. Evaluation of physical properties of multilayer discolorable heat-sensitive leather

Table 1 below shows the results of measuring the physical properties such as fastness to light, bending resistance and discoloration using the multi-layer discolorable heat-sensitive leather of Examples 1 and 2 and Comparative Example 1. [

Evaluation items Example 1 Example 2 Comparative Example 1 Analysis method Stain resistance 3 ~ 4 grade 2 ~ 3 grade 1 grade BS1006 E04 Number of discolored layers 2 2 One Sensory test

As shown in Table 1, the multi-layer discolorable heat-sensitive skin produced by Examples 1 and 2 was superior in all of the stain resistance and discoloration resistance as compared with Comparative Example 1.

In addition, when the antifouling agent was used in the top coating of Example 1, it showed better stain resistance than Example 2.

As described above, the present invention can be applied to a variety of uses such as shoes, bags, clothes, and the like, which are excellent in stain resistance and discoloration resistance, by manufacturing a temperature-discoloring substance and an antifouling agent to a leather- Is expected.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (5)

(a) a basic painting process in which crust leather is used to paint a mixture containing a white pigment on a leather surface to produce a white background; And
(b) coating a mixture containing a thermosensitive material and an antifouling agent on the white crust leather produced in the step (a), wherein the thermosensitive material of each layer is different in temperature discoloration range from each other, Painting process
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The white pigment in the mixture containing the white pigment in the step (a) is used in an amount of 0.1 to 70% by weight of the total mixture, the step (a) is repeated one to five times,
(b)
(b1) a base coating step of treating the thermosensitive material having a temperature discoloring range of 26 to 35 degrees Celsius with 0.1 to 50 wt% of the whole mixture;
(b2) a medium coating step of treating the thermosensitive material having a temperature discoloring range of 15 to 25 degrees Celsius with 0.1 to 50 wt% of the whole mixture after the step (b1); And
(b3) a top coating process for coating the mixture containing the antifouling agent after the step (b2)
Further comprising:
The antifouling agent is applied to a base, a medium, and a top coating process using 0.1 to 50% by weight of a fluorine-based or silicone-based antifouling agent,
The thermosensitive material is an organic-based thermochromic coloring matter and is a black color of a diphenyl aminophenol, terephthaloyl acetanilide, triphenyl methane, fluorene, , The use of one or more of yellow, yellow, blue, red, purple, green, and orange hues to produce a multi-layer discolorable, Way. delete delete delete delete