KR102260933B1 - Leather fabric using natural leather waste and manufacturing method thereof - Google Patents

Abstract

The leather fabric using the natural leather waste of the present invention and the method for manufacturing the same can control the emission and absorption of heat, so that it can be used in a variety of temperature ranges.
In addition, when a leather fabric is used as an upper for shoes, the wearability is improved by absorbing heat and delaying the speed of sweating. When used as wallpaper or curtain paper, it has the effect of absorbing external heat transferred to the room in hot summer to prevent temperature rise, and delaying cooling by dissipating heat in winter.

Description

Leather fabric using natural leather waste and its manufacturing method {LEATHER FABRIC USING NATURAL LEATHER WASTE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a leather fabric using natural leather waste and a method for manufacturing the same, and more particularly, it is possible to improve the utilization of resources by using natural leather waste, and to control the emission and absorption of heat at various temperatures It relates to a leather fabric using natural leather waste that can be used in a range and a manufacturing method thereof.

In general, in the manufacture of various products using natural leather, shaving scraps are unavoidably shaved off for thickness control, or pieces cut to a certain part for size adjustment are generated as waste. classify

On the other hand, the waste of natural leather as described above is close to about 50% of the raw material skin standard. Despite the fact that the mass discharged waste can be a valuable resource, most of it is incinerated or landfilled as industrial waste without recycling, so Secondary pollution caused by odor and sewage leakage from decay occurs and acts as a harmful factor to the human body, so it is a very serious environmental problem, as well as an increase in the excessive treatment cost (50,000 to 70,000 won/ton) of waste. is becoming To solve this problem, various recycling technologies have been developed and commercialized, but in reality, due to the tag of recycling, the expansion to general-purpose shoe uppers other than cheap shoes is somewhat limited.

As described above, looking at the prior art of manufacturing artificial leather in the prior art, in Patent Document 1, a synthetic resin for a film forming the outer skin of a synthetic leather fabric and a synthetic leather sheet constituting the base of the synthetic leather fabric are combined, but the synthetic resin for the film and a laminating step of forcibly discharging gas that may be generated when the two materials are combined by applying heat to the synthetic leather sheet to the outside. It's about leather.

In order to solve this problem, in Patent Document 2, shaving pieces generated from the leather on the back of the meat layer are used as a raw material and put into a grinder to suit the purpose and thickness of the final product to be physically pulverized, and the leather treatment agent of the pre-treatment concept is applied step by step. After treatment with 0.1-10.0% and adjusting pH in the range of 3.0-6.5, and mixing 0.1-20.0% of NR and SBR latex, an adhesive material, and stirring for 1 hour or more, waterproof, sound-absorbing, antibacterial and flame-retardant functions A method for manufacturing a sheet using leather waste, in which 0.1-20.0% of aluminum sulfate was added to the mixture through the above process by mixing again with a special chemical having

And in Patent Document 3, 1) a process for preparing a waste leather raw material (A) that is prepared to use the waste leather as a raw material by using the waste leather as a raw material by 1) grinding, mixing chemicals, and adding an adhesive (NR latex) and a coagulant; 2) The impregnated fiber (B) preparation process of preparing the fiber impregnated with the impregnant by mixing the fiber with the impregnant, 3) the waste leather raw material (A) and the impregnated fiber (B) prepared in steps 1 and 2, respectively ) to produce a leather fabric (C) by transferring it to a wire mesh and simultaneously laminating, pressing, drying, calendering, and winding the waste leather raw material (A) and the fiber (B) impregnated with the impregnating agent in one piece. A method for producing a leather fabric manufactured using a leather by-product, characterized in that it is proposed.

And in Patent Document 4, in the method for producing a leather fabric from recycled natural leather waste, the step of pulverizing the natural leather waste, adding a crosslinking agent and a co-crosslinking agent to a substrate mixed with rubber latex and an aqueous emulsion to prepare a binder, Proposing a method for producing a leather fabric from recycled natural leather waste, characterized in that it comprises the steps of mixing the pulverized natural leather waste and a binder, and manufacturing a mixture of the natural leather waste and the binder in a sheet form did.

However, in the existing technologies using natural leather waste, mechanical strength and hydrolysis resistance are improved by mixing pulverized natural leather waste and rubber latex, but the breathability is still lower than that of natural leather. In this case, there was a problem that internal heat was difficult to be released.

In addition, it was attempted to supplement the mechanical strength by increasing the solid content of latex or the content of latex itself, but there was a limitation in that it was difficult to express the inherent feeling of leather because the texture was relatively deteriorated. In addition, it is difficult to dissipate and absorb heat, making it unsuitable for application to various fashion materials (eg, clothes, shoe uppers or ornaments, sofas, bag wallets, etc.), and design insoles or backcounts for shoes that are not directly exposed by design. counter) or the reinforcing fabric formed on the rear part of the belt.

Republic of Korea Patent Publication No. 10-1022828 Republic of Korea Patent Publication No. 10-0815634 Republic of Korea Patent Publication No. 10-1333133 Republic of Korea Patent Publication No. 10-1825372

The problem to be solved by the present invention is to improve the utilization of resources by utilizing natural leather waste, and to control the emission and absorption of heat, so that leather fabric using natural leather waste that can be utilized in various temperature ranges and To provide a manufacturing method thereof.

In order to solve the above technical problem, the present invention is based on a mixture containing natural leather waste and a binder, and includes a heat control additive uniformly distributed in the base material, the heat control additive is a phase change material, The phase change material provides a leather fabric using natural leather waste contained in the form impregnated in the pores of the porous body or supported in the capsule.

According to a preferred embodiment of the present invention, 5 to 90 parts by weight of the heat control additive may be contained with respect to 100 parts by weight of the natural leather waste.

In addition, the present invention comprises the steps of preparing a mixture by pulverizing natural leather waste into a powder form and mixing the natural leather waste powder with water; Preparing a binder of a substrate in which rubber latex and an aqueous emulsion are mixed or an aqueous emulsion alone; preparing mixed sludge by mixing the mixture and the binder; Separating water from the mixed sludge; and obtaining a leather fabric after separating the water; a heat control additive in at least one step of preparing the mixed sludge and separating water In addition, the heat control additive is a phase change material, and the phase change material is impregnated in the pores of the porous body or supported in a capsule. It provides a method for manufacturing a leather fabric using natural leather waste.

According to a preferred embodiment of the present invention, when the heat control additive is added in the step of separating the water, the heat control additive may be added in the initial step in which the water starts to be separated.

According to a preferred embodiment of the present invention, in the step of separating water, water may be separated by phase-separating the emulsion of the binder through pH adjustment.

According to a preferred embodiment of the present invention, the pH adjustment may be performed by adjusting the pH in the range of 2 to 6.

According to a preferred embodiment of the present invention, the step of preparing the mixed sludge is performed by mixing 10 to 50 parts by weight of a binder with respect to 100 parts by weight of natural leather waste, and the heat control additive is based on 100 parts by weight of natural leather waste. 5 to 90 parts by weight may be added.

The leather fabric using the natural leather waste of the present invention and the method for manufacturing the same can control the emission and absorption of heat, so that it can be used in a variety of temperature ranges.

In addition, when a leather fabric is used as an upper for shoes, the wearability is improved by absorbing heat and delaying the speed of sweating. When used as wallpaper or curtain paper, it has the effect of absorbing external heat transferred to the room in hot summer to prevent temperature rise, and delaying cooling by dissipating heat in winter.

1 is a process flow diagram according to a preferred embodiment of the present invention.
2 is a process flow diagram according to a preferred embodiment of the present invention.
3A to 3C are DSC (Differential Scanning Calorimetry) graphs of a heat control additive according to a preferred embodiment of the present invention.
4 is a graph showing the thermal control performance of a leather fabric according to a preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily carry out the present invention.

As described above, the existing technology using natural leather waste has poor air permeability compared to natural leather, making it difficult to release internal heat when a shoe is manufactured and worn with the fabric. In addition, although the mechanical strength was supplemented by increasing the solid content of the latex or the content of the latex itself, it was difficult to express the inherent feeling of leather because of the limitation in that the texture was relatively deteriorated. In addition, it is inappropriate to apply to various fashion materials (for example, clothes, shoe uppers or ornaments, sofas, bag wallets, etc.) due to the difficulty in dissipating and absorbing heat, and insoles or backcounts for shoes that are not directly exposed by design. Back counter) or the reinforcing fabric formed on the rear part of the belt, there was a limitation in that it could only be used limitedly.

Accordingly, the present invention comprises the steps of preparing a mixture by pulverizing natural leather waste into a powder form and mixing the natural leather waste powder with water; Preparing a binder of a substrate in which rubber latex and an aqueous emulsion are mixed or an aqueous emulsion alone; preparing mixed sludge by mixing the mixture and the binder; separating water from the mixed sludge; and obtaining a leather fabric after separating the water, wherein a heat control additive is added in at least one of the step of preparing the mixed sludge and the step of separating water, and the heat control additive is a phase change It is a material, and the phase change material is a method for manufacturing a leather fabric using natural leather waste added in a form impregnated in the pores of a porous body or supported in a capsule, and a solution to the above-mentioned limitations was sought.

Through this, the present invention can control the emission and absorption of heat, so that it can be utilized in various temperature ranges. In addition, it has excellent physical properties and at the same time can maintain the soft characteristics of leather, so that it can be used for various articles. In addition, when a leather fabric is used as an upper for shoes, the wearability is improved by absorbing heat and delaying the speed of sweating. When used as wallpaper or curtain paper, it has the effect of absorbing external heat transferred to the room in hot summer to prevent temperature rise, and delaying cooling by dissipating heat in winter.

1 is a process flow diagram according to a preferred embodiment of the present invention. Referring to Figure 1, the present invention is a step of preparing a mixture by mixing natural leather waste powder with water after pulverizing natural leather waste into a powder form (S1), a substrate or aqueous emulsion mixed with rubber latex and an aqueous emulsion Preparing the binder of the substrate alone (S2), mixing the mixture and the binder to prepare mixed sludge (S3), separating water from the mixed sludge (S4) and separating the water and then obtaining a leather fabric (S5). In addition, the step (S0) of adding the heat control additive may be performed in steps S3 to S4. That is, the step (S0) of adding the heat control additive may be performed in step S3, in step S4, or in both steps S3 and S4.

First, the step (S1) of preparing a mixture by pulverizing the natural leather waste into a powder form and mixing the natural leather waste powder with water will be described.

Natural leather waste means waste generated from natural leather (eg, shaving pieces or cutting pieces, etc.), and is used in the form of a pulverized powder.

Natural leather waste may be pulverized in a powder (powder) form by a hammer mill or beating process, and used in a state of being dispersed in water by mixing with water.

Preferably, the mixing of the natural leather waste and water may be performed by mixing 150 to 400 parts by weight of water with respect to 100 parts by weight of the natural leather waste, more preferably 200 to 350 parts by weight of water. .

Next, a step (S2) of preparing a binder of a substrate in which rubber latex and an aqueous emulsion are mixed or an aqueous emulsion alone is described.

The binder improves bonding strength so that the bonding of natural leather wastes is facilitated. In addition, rubber latex can improve the flexibility when combining the pulverized natural leather waste, and the aqueous emulsion can improve the mechanical strength of the leather fabric.

As the rubber latex, various types commonly used in the art may be used, and preferably, any one or more selected from the group consisting of NR latex, SBR latex, CR latex and NBR latex may be used.

Rubber latex may be used in an appropriate amount together with the aqueous emulsion to improve flexibility when binding natural leather waste, and preferably, less than 10 parts by weight based on 100 parts by weight of the aqueous emulsion. More preferably, it may be used in an amount of 5 to 8.5 parts by weight. If it is used in excess of the above range, there may be problems in that the texture is deteriorated, such as when the leather fabric is manufactured, the texture becomes stiff.

Conventionally, sufficient mechanical strength can be obtained only when the content of rubber latex exceeds the above range, and in this case, the texture of the leather fabric is deteriorated, making it difficult to express the inherent feeling of leather. However, as will be described later, the present invention is mixed with an aqueous emulsion to have sufficient mechanical strength and to express the inherent feeling of leather despite lowering the content of rubber latex.

As the aqueous emulsion, various types commonly used in the art may be used, and preferably, an aqueous emulsion having one or more crosslinking reactive groups selected from a carboxy group, an amide group and a hydroxyl group may be used, and more preferably can be used alone or in combination of two or more of polyurethane emulsion, acrylic emulsion, or ethylene vinyl acetate emulsion.

In addition, the aqueous emulsion may be used alone or in combination with rubber latex, and may be used in an appropriate amount to improve the mechanical strength of the leather fabric. Preferably, the aqueous emulsion may be added in an amount of 10 to 50 parts by weight based on 100 parts by weight of the natural leather waste, more preferably 20 to 40 parts by weight, and more preferably 25 to 35 parts by weight. can When the aqueous emulsion is used within the above range, there is an advantage in that it is possible to improve the mechanical strength of the leather fabric and at the same time prevent deterioration of the texture.

Meanwhile, in some cases, the binder may include a crosslinking agent, a co-crosslinking agent, or a filler added thereto.

The crosslinking agent is added to improve the mechanical strength and hydrolysis resistance of the leather fabric through the crosslinking reaction of the aqueous emulsion, and the co-crosslinking agent is added to improve mechanical strength and compression recovery at the same time. In the case of a crosslinking agent, a sulfur crosslinking agent; It can be used alone or in combination of two or more of the isocyanate crosslinking agent or melamine crosslinking agent, and in the case of the co-crosslinking agent, a trifunctional monomer can be used, for example, triallyl cyanurate, triallyl isocyanurate ( triallyl isocyanurate), trimethylolpropane trimethacylate, diethylene glycol dimethacrylate, sulfide-based or guanidine-based crosslinking aids may be used alone or in combination of two or more.

Specifically, the isocyanate crosslinking agent is hexamethylene diisocyanate biuret, hexamethylene diisocyanate isocyanurate, toluene diisocyanate / trimethylolpropaneadduct, There are isocyanurate (toluene diisocyanate isocyanurate) and isophorone diisocyanate isocyanurate (isophorone diisocyanate isocyanurate), and melamine-based crosslinking agents include melamine resins, methylated melamine resins, butylated melamine resins, and isobutylated Melamine resin, etc.

The crosslinking agent may be used in an amount of 1 to 5 parts by weight based on 100 parts by weight of the base material, and if the content of the crosslinking agent is less than 1 part by weight, there is a risk that shrinkage occurs during the manufacture of leather fabric and mechanical strength and hydrolysis resistance may decrease , When it exceeds 5 parts by weight, there is a risk that the texture may be deteriorated.

In addition, in the case of the co-crosslinking agent, 1 to 15 parts by weight is used based on 100 parts by weight of the base material. If the content of the co-crosslinking agent is less than 1 part by weight, there is a risk of deterioration of compression recovery properties. This decreases, and there is a risk of shrinkage of the leather fabric.

Fillers are usually used to improve mechanical strength, but in the case of regenerated leather fabrics, they are added to fill gaps between powders. One or two types of fillers are among magnesium carbonate, calcium carbonate, silica, aluminum chloride, magnesium chloride, or barium chloride. It can be used in combination with the above.

The content of the filler is preferably 5 to 10 parts by weight based on 100 parts by weight of the base material. If the content of the filler is less than the above range, the gap filling effect is low, so that the regenerated leather fabric may shrink or deform, and if it exceeds the above range, the surface of the leather fabric may be rough.

Next, a step (S3) of preparing mixed sludge by mixing the mixture and the binder will be described.

According to a preferred embodiment of the present invention, the step of preparing the mixed sludge (S3) may be performed by mixing 10 to 50 parts by weight of a binder with respect to 100 parts by weight of natural leather waste. More preferably, the step of preparing the mixed sludge may be performed by mixing 20 to 40 parts by weight of a binder with respect to 100 parts by weight of natural leather waste. In this case, the combination of natural leather waste can be smoothly performed, and at the same time, the unique feeling of leather can be expressed, thereby improving the texture.

If the binder is mixed in less than the above range, there is a risk that the natural leather waste is not properly combined and thus defective. If the binder is mixed in excess of the above range, the texture is lowered and the unique feeling of leather is expressed. Problems that are difficult to deal with may arise.

At this time, mixing of the mixture and the binder may be performed by uniformly stirring them for about 10 to 40 minutes.

Next, the step (S4) of separating water from the mixed sludge will be described.

According to a preferred embodiment of the present invention, in the step of separating the water (S4), the stability of the binder emulsion is collapsed through pH adjustment, and the water can be separated by phase separation. By separating water in this way, it becomes possible to obtain a mixture formed in a sheet form. The leather fabric of the present invention can be formed from the mixture formed in the sheet shape.

In addition, the pH control may be adjusted to a pH of 2 to 6 using a chemical that dissolves in water and is acidic, such as aluminum sulfate. Preferably, the pH may be adjusted in the range of 2 to 5.

On the other hand, the step (S0) of adding a heat control additive in any one or more of the steps S3 to S4 is performed.

That is, the step (S0) of adding the heat control additive may be performed at step S3, at step S4, or both at step S3 and S4.

According to a preferred embodiment of the present invention, when the heat control additive is added in the step of separating the water, the heat control additive may be added in the initial step in which the water starts to be separated.

In this regard, Figure 2 is a process flow diagram according to a preferred embodiment of the present invention. Referring to FIG. 2 , it can be seen that the step of adding the heat control can be performed both in the step of preparing the mixed sludge (S3') and the step of separating the water (S4').

In addition, in the step (S0) of adding the heat control additive, the function of controlling the release and absorption of heat of the leather fabric of the present invention may be imparted by adding the heat control additive.

The heat control additive is a phase change material (PCM). The heat control additive has a property of being converted into a liquid and a solid according to the degree of heat absorption, and due to this property, there is a limitation that it can be used in the manufacture of leather fabrics only below the melting point. In addition, even if it is used to manufacture leather fabrics, there is a limit to seeping out of the leather fabric like wet clothes in a temperature range exceeding the melting point. In addition, when the phase change material itself is used, an oil layer is formed on the top of the leather fabric after water is separated in step S4, making it difficult to manufacture the leather fabric, and there is a limitation in that a continuous manufacturing process is impossible.

Accordingly, the present invention solves the above-described limitations by adding the phase change material in the form impregnated in the pores of the porous body or supported in the capsule. In this case, when the leather fabric is manufactured by using the phase change material, the thermal control function can be smoothly performed even in a temperature range exceeding the melting point, and there is an effect that the conventional leather fabric does not seep out to the outside. In addition, since an oil layer is not formed on the upper end of the leather fabric, continuous production of the leather fabric is facilitated.

Meanwhile, the melting point of the heat control additive may be selected from various temperature ranges according to the purpose of use. Accordingly, the present invention has the effect of controlling the emission and absorption of heat in various temperature ranges.

For example, if it is intended to be used as an article used in daily life, it is desirable to use a heat control additive having a melting point in the range of 10 to 30° C. because it is necessary to detect heat absorption and release in the range of human life. If the melting point is less than 10 ℃, it may be difficult for the user to recognize the warming effect against the cold, and since it exists in a molten state in the changing seasons such as spring and autumn, it may be difficult to express the heat absorption function. In addition, if the melting point exceeds 30 ℃, it is difficult for the user to recognize the cooling feeling, air permeability, etc., the utility value may be reduced.

In addition, the content of the heat control additive may be selected in an appropriate range depending on the case. Specifically, the higher the inherent heat control performance of the heat control additive, the better the performance compared to the amount used by using a small amount.

For example, when the melting point of a commercially available phase change material is 10 to 30° C., it has an average thermal control performance of 150 to 250 J/g. In this case, the heat control additive is preferably added in an amount of 5 to 90 parts by weight based on 100 parts by weight of the natural leather waste. More preferably, it may be added in an amount of 10 to 80 parts by weight based on 100 parts by weight of natural leather waste.

Meanwhile, the content of the heat control additive may be adjusted according to the content of water mixed with the natural leather waste powder. Preferably, the heat control additive is added in an amount of 5 to 25 parts by weight based on 100 parts by weight of the mixed water. If the heat control additive is added in excess of the above range, mixing is not performed smoothly, and a large amount of the heat control additive is concentrated in the upper layer due to the density difference, thereby making it difficult to obtain a homogeneous leather fabric.

Next, after separating the water, a step (S5) of obtaining a leather fabric may be performed to obtain a desired leather fabric.

The obtained leather fabric has excellent sensing performance for heat absorption and emission, and thus can be utilized in various temperature ranges. In addition, when leather fabric is used as an upper for shoes, the wearability is improved by absorbing heat and delaying the speed of sweating. When used as wallpaper or curtain paper, it absorbs external heat transferred to the room in hot summer to prevent temperature rise, and in winter it releases heat to delay cooling, so it can be used in various products.

The heat control performance of the leather fabric can be set in various ranges depending on the intended use of the fabric to perform the leather fabric manufacturing process, and for use in fashion materials used in daily life, preferably 1.0 ~ 10 J/ It can be ^{cm 2 .}

If the heat control performance is less than the above range, the performance for heat absorption or emission is lowered, and if it exceeds the above range, the performance is excellent, but when the thickness of the fabric is about 1 mm, the content of the heat control additive is increased. Manufacturing can be difficult. In addition, in the case of excessively high performance, the thickness of the fabric must be manufactured to be about 4 mm or more in order to continuously maintain the high performance, so that it is unsuitable for use in applications such as shoes, curtains, and wallpaper.

In addition, the present invention is based on a mixture containing natural leather waste and a binder, and includes a heat control additive uniformly distributed in the base material, the heat control additive is a phase change material, and the phase change material is in the pores of the porous body. Provided is a leather fabric using natural leather waste contained in an impregnated form or in a form supported in a capsule.

The description of the leather fabric will be omitted since it overlaps with the above description.

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

Example One

100 parts by weight of pulverized natural leather waste powder and 250 parts by weight of water were put in a tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, 30 parts by weight of a 35% solids PU emulsion and 20 parts by weight of a capsule-type heat control additive were added as a binder and stirred for 20 minutes to prepare sludge. Thereafter, the emulsion of the binder was phase-separated by transferring it through a pipe to adjust the pH, and water was separated to prepare a leather fabric with a thickness of about 0.6 mm.

Example 2

100 parts by weight of pulverized natural leather waste and 250 parts by weight of water were put in a tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, 30 parts by weight of a 35% solids PU emulsion was added as a binder, and the mixture was further stirred for about 20 minutes to prepare sludge. This is transferred through a pipe to adjust the pH to phase-separate the binder emulsion, and at the point where water starts to separate, 40 parts by weight of the hybrid heat control additive, which is impregnated in the pores of the porous body, is uniformly added to a thickness of about 0.6 mm. A leather fabric was manufactured.

Example 3

100 parts by weight of pulverized natural leather waste and 250 parts by weight of water were put in a tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, 30 parts by weight of a 35% solids PU emulsion and 50 parts by weight of a capsule additive were added as a binder, and the mixture was further stirred for 20 minutes to prepare sludge. Thereafter, the emulsion of the binder was phase-separated by controlling the pH by transferring it through a pipe, and 20 parts by weight of the capsule-type heat control additive was uniformly added at the point where the water started to separate to prepare a leather fabric with a thickness of about 0.6 mm.

Example 4

100 parts by weight of pulverized natural leather waste and 250 parts by weight of water were put in a tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, 30 parts by weight of a 35% solids PU emulsion and 70 parts by weight of a capsule-type heat control additive were added as a binder, and the mixture was stirred for 20 minutes to prepare sludge. After that, it was transferred through a pipe to adjust the pH to phase-separate the binder emulsion, and water was separated to prepare a leather fabric.

comparative example One

100 parts by weight of pulverized natural leather waste and 250 parts by weight of water were put in a tank and stirred for about 10 minutes to disperse the natural leather waste in water. Herein, 30 parts by weight of a 35% solids PU emulsion and 20 parts by weight of a heat absorption and release additive having a melting temperature of about 24° C. were added as a binder and stirred for an additional 20 minutes to prepare sludge. After that, it was transferred through a pipe to adjust the pH to phase-separate the binder emulsion, and water was separated to prepare a leather fabric. However, the heat control additive in the form of oil remained on the top of the leather fabric, so that the fabric could not be continuously manufactured.

Experimental example One. heat control Performance measurement

The heat control performance of the leather fabrics prepared in Examples 1 to 3 and Comparative Example 1 was measured and shown in Table 1 below.

Experimental example 2. Mix sludge appearance observation

While carrying out Examples 1 to 3 and Comparative Example 1, the appearance of the mixed sludge formed in the step (S3) of preparing the mixed sludge was observed and shown in Table 1 below.

(○: sludge is uniformly formed and good condition, △: sludge is not uniform X: sludge not formed)

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Crushed natural leather waste (parts by weight) 100 100 100 100 100 water (parts by weight) 250 250 300 250 250 aqueous emulsion ^{1 )} (PU emulsion)
(parts by weight) 30 30 30 30 30 capsule type
heat control additive ^{2 )}
(parts by weight) 20 - 70 70 - Hybrid type
heat control additive ^{3 )}
(parts by weight) - 40 - - - Liquid heat control additive ^{4 )}
(parts by weight) - - - - 20 Addition of heat control additives S3 S4 S3, S4 S3 S3 Mixed sludge appearance observation ○ ○ ○ △ X leather fabric
Thermal control performance (J/g) 16 21 33 - -

_{1) Shinchang Industrial Co., Ltd. polyurethane emulsion , WPU -10, 35% solids, 2) of Ennet (Korea) Capsule Additives, 3) Germany Rubitherm PX 25, 4) Germany Rubitherm RT 24}

Referring to Table 1, in the case of Examples 1 to 3, the appearance of the mixed sludge is well formed. In addition, the heat control performance of the leather fabric manufactured therefrom also has an excellent value. However, in the case of Example 4, the added amount of the heat control additive is excessive compared to the water content, so that the powder is excessively present on the surface of the mixed sludge, so that the mixed sludge is not easily formed.

In Comparative Example 1, mixed sludge is not formed by adding the heat transfer material in a liquid form, and an oil layer is formed after the step of separating water, so that it is difficult to manufacture a leather fabric easily, and it is difficult to continuously manufacture a leather fabric.

In this regard, FIGS. 3A to 3C are DSC (Differential Scanning Calorimetry) graphs of the heat control additive according to a preferred embodiment of the present invention. 3A is a DSC graph of the capsule-type heat control additive, FIG. 3B is a DSC graph of the hybrid type heat control additive, and FIG. 3C is a DSC graph of the liquid heat control additive (phase change material itself). The heat control performance of the capsule type heat control additive is about 141 J/g, the heat control performance of the hybrid type heat control additive is about 83.5 J/g, and the heat control line of the liquid heat control additive is about 160.4 J/g appears as

4 is a graph showing the thermal control performance of a leather fabric according to a preferred embodiment of the present invention. Specifically, FIG. 4 is a graph showing the thermal control performance of the leather fabric manufactured according to Example 1. Referring to FIG. Referring to FIG. 4 , it can be seen that the heat control performance of the leather fabric of the present invention is about 16.52 J/g, which is excellent.

Claims (7)

delete delete preparing a mixture by pulverizing the natural leather waste into a powder form and mixing the natural leather waste powder with water;
Preparing a binder of a substrate in which rubber latex and an aqueous emulsion are mixed or an aqueous emulsion alone;
preparing mixed sludge by mixing the mixture and the binder;
separating water from the mixed sludge; and
Including; obtaining a leather fabric after separating the water;
Adding a heat control additive in at least one step of preparing the mixed sludge and separating water,
The heat control additive is a phase change material, and the phase change material is added in a form impregnated in the pores of the porous body or supported in a capsule,
The step of separating the water is a method of manufacturing a leather fabric using natural leather waste in which water is separated by phase-separating the emulsion of the binder through pH control.
4. The method of claim 3,
When a heat control additive is added in the step of separating water, a method for manufacturing a leather fabric using natural leather waste, characterized in that the heat control additive is added at an initial stage when water starts to be separated.
delete 4. The method of claim 3,
The method for producing a leather fabric using natural leather waste, characterized in that the pH adjustment is performed by adjusting the pH in the range of 2 to 6.
4. The method of claim 3,
The step of preparing the mixed sludge is performed by mixing 10 to 50 parts by weight of a binder with respect to 100 parts by weight of natural leather waste,
The heat control additive is a leather fabric manufacturing method using natural leather waste, characterized in that it is added in an amount of 5 to 90 parts by weight based on 100 parts by weight of the natural leather waste.

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