KR20210037391A - Leather fabric using natural leather waste and manufacturing method thereof - Google Patents

Abstract

A leather fabric using natural leather wastes and a method for manufacturing the same, of the present invention, can control the emission and absorption of heat, and thus 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 sweat being trapped inside the shoes. When used as wallpaper or curtain, the present invention 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 release and absorption of heat, and thus various temperatures. It relates to a leather fabric using natural leather waste that can be used in a range and a method of manufacturing the same.

In general, when manufacturing various products using natural leather, shaving scraps are inevitably cut off the back side for thickness control, or pieces of a certain part cut out for size control are generated. Classify.

On the other hand, natural leather waste as described above is close to about 50% of raw material skin, and despite the fact that mass discharged waste can be a valuable resource, most of the waste leather organic waste is incinerated or landfilled as industrial waste without recycling. It is a very serious environmental problem as it acts as a harmful factor to the human body due to secondary pollution caused by odor generated by decay and sewage leakage, as well as an increase in the excessive disposal cost (50,000 ~ 70,000 won/ton) of waste. Has become. To solve this problem, various recycling technologies have been developed and commercialized, but in reality, because of the label of recycling, it is somewhat limited to expand to general-purpose uppers for shoes other than cheap shoes.

As described above, looking at the prior art for manufacturing the conventional artificial leather, in Patent Document 1, a synthetic resin for a coating 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 coating And a laminating step of forcibly discharging gases that may be generated when combining two materials by applying heat to the synthetic leather sheet, a manufacturing method, a manufacturing system, and a dry synthesis manufactured thereby It is about leather fabric.

In order to solve this, Patent Document 2 uses the shaving pieces generated from the leather on the back side of the six-sided layer as a raw material and puts it into a grinder to suit the purpose and thickness of the final product and physically micronizes it. After treatment with 0.1-10.0%, the pH is adjusted to the range of 3.0-6.5, and 0.1-20.0% of the adhesive material NR and SBR latex compound is mixed and stirred for at least 1 hour, and then waterproof, sound-absorbing, antibacterial and flame retardant functions A method for manufacturing a sheet using leather waste was proposed by remixing with a special chemical having a and then passing through a sheet manufacturing machine in a state where 0.1-20.0% of aluminum sulfate was added to the mixture that went through the above process to coagulate, and then subjected to compression dehydration and drying treatment.

In addition, in Patent Document 3, 1) the waste leather raw material (A) preparation process in which the waste leather is prepared to be used as a raw material by proceeding with the process of pulverization, chemical compounding, adhesive (NR latex) and coagulant input process, and 2) Impregnated fibers (B) preparation process of preparing fibers impregnated with an impregnant by mixing fibers with an impregnant using fibers, and 3) impregnated fibers (B) with waste leather raw materials prepared in steps 1 and 2, respectively. ) To transfer the raw material of waste leather (A) and the fiber (B) impregnated with the impregnating agent into a wire mesh, and at the same time, the process of laminating, pressing, drying, calendering, and winding proceeds to manufacture the leather fabric (C). A method of manufacturing a leather fabric manufactured using a leather by-product, characterized in that, was proposed.

And in Patent Document 4, in the manufacturing method of a leather fabric recycled from natural leather waste, the step of pulverizing the natural leather waste, the step of preparing a binder by adding a crosslinking agent and a co-crosslinking agent to a substrate in which rubber latex and aqueous emulsion are mixed, Proposed a method for manufacturing a leather fabric recycled from natural leather waste, comprising the step of mixing the pulverized natural leather waste and a binder, and preparing a mixture of the natural leather waste and the binder in a sheet form. I did.

However, conventional technologies using natural leather waste improve mechanical strength and hydrolysis resistance by mixing pulverized natural leather waste and rubber latex, but still have poor breathability compared to natural leather, making shoes with the above fabric and wearing them. In this case, there is a problem in that internal heat is difficult to be released.

In addition, it was attempted to supplement the mechanical strength by increasing the solid content of the latex or the content of the latex itself, but there was a limitation in that it was difficult to express the unique feel of leather because there was a limitation in that the texture was relatively lowered. In addition, it is difficult to dissipate and absorb heat, making it unsuitable to apply to various fashion materials (for example, clothing, shoe uppers or ornaments, sofas, bag wallets, etc.), and not directly exposed in design, such as shoe insoles or backcounts. counter) or the reinforcement fabric formed on the back side of the belt.

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

The problem to be solved by the present invention is a leather fabric using natural leather waste that can be utilized in a variety of temperature ranges since it is possible to improve the utilization of resources by utilizing natural leather waste, and control the release and absorption of heat. It is to provide a method of manufacturing the same.

In order to solve the above-described technical problem, the present invention is based on a mixture containing natural leather waste and a binder, a heat control additive uniformly distributed in the base material is included, and 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, a heat control additive may be contained in an amount of 5 to 90 parts by weight based on 100 parts by weight of the natural leather waste.

In addition, the present invention comprises the steps of 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 base material obtained by mixing rubber latex and an aqueous emulsion or a base material comprising an aqueous emulsion alone; Mixing the mixture and the binder to prepare a mixed sludge; Separating water from the mixed sludge; And obtaining a leather fabric after separating the water; Including, a heat control additive in at least one of the steps of preparing the mixed sludge and separating water Is added, and the heat control additive is a phase change 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.

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 at an initial step in which the water begins 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. It may be added in an amount of 5 to 90 parts by weight.

The leather fabric and its manufacturing method using natural leather waste of the present invention can control the release and absorption of heat, and thus can be used in a variety of temperature ranges.

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

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, with reference to the accompanying drawings, according to an embodiment of the present invention will be described in detail so that those of ordinary skill in the art can easily implement the present invention.

As described above, the conventional technology using natural leather waste has poor ventilation compared to natural leather, and it is difficult to release internal heat when a shoe is manufactured and worn with the fabric. In addition, it was attempted to supplement the mechanical strength by increasing the solid content of the latex or the content of the latex itself, but rather, it was difficult to express the unique feel of leather due to the limitation of relatively lowering the texture. In addition, it is difficult to dissipate and absorb heat, making it unsuitable to apply to various fashion materials (e.g., clothing, shoe uppers, ornaments, sofas, bag wallets, etc.), and insoles or backcounts for shoes that are not directly exposed by design. Back counter) or the reinforcement fabric formed on the back side of the belt has a limitation that can only be used.

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 base material obtained by mixing rubber latex and an aqueous emulsion or a base material comprising an aqueous emulsion alone; Mixing the mixture and the binder to prepare a mixed sludge; Separating water from the mixed sludge; And obtaining a leather fabric after separating the water; including, adding a heat control additive in at least one of the steps of preparing the mixed sludge and separating the water, wherein the heat control additive is a phase change It is a material, and the phase change material is a method of 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-described limitations was sought.

Through this, the present invention can control the release and absorption of heat, and thus has an effect that can be used in a variety of temperature ranges. In addition, it has excellent physical properties and can maintain the soft properties of leather at the same time, so that it can be used in a variety of products. In addition, when a leather fabric is used as an upper for shoes, the feeling of wearing is improved by the effect of delaying the rate of sweating by absorbing heat. When used as wallpaper or curtain paper, it absorbs external heat transferred indoors in hot summer to prevent temperature rise, and in winter, it has the effect of delaying cooling by releasing heat.

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 base material or an aqueous emulsion mixed with a rubber latex and an aqueous emulsion. Preparing a binder of a single substrate (S2), preparing a mixed sludge by mixing the mixture and the binder (S3), separating water from the mixed sludge (S4), and separating the water It includes a step (S5) of obtaining a leather fabric after. In addition, the step of adding the heat control additive (S0) may be performed in steps S3 to S4. That is, the step of adding the heat control additive (S0) may be performed in step S3, step S4, or may be performed in step S3 and step 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 refers to waste generated from natural leather (for example, shaving pieces or cutting pieces, etc.), and is used in the form of pulverized powder.

Natural leather waste can be pulverized in the form of a powder (powder) by treatment with a hammer mill or beating, and is used in a state 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 based on 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 base material obtained by mixing rubber latex and an aqueous emulsion or a base material comprising an aqueous emulsion alone will be described.

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

As the rubber latex, various types commonly used in the relevant technical field 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 can be used in an appropriate amount together with the aqueous emulsion to improve flexibility when combining 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 beyond the above range, there may be a problem in that the texture is deteriorated, such as stiff texture when manufacturing the leather fabric.

Conventionally, sufficient mechanical strength could be obtained only when the content of the rubber latex exceeds the above range, and in this case, the texture of the leather fabric was deteriorated, making it difficult to express the unique feeling of leather. However, as will be described later, the present invention has an effect capable of expressing sufficient mechanical strength and a leather-specific feel, even though it is mixed with an aqueous emulsion to lower the rubber latex content.

As the aqueous emulsion, various types commonly used in the relevant technical field may be used, and preferably, an aqueous emulsion having one or two or more crosslinkable reactive groups selected from a carboxyl group, an amide group and a hydroxy group may be used, and more preferably May be used alone or in combination of two or more of a polyurethane emulsion, an acrylic emulsion, or an ethylene vinyl acetate emulsion.

In addition, the aqueous emulsion may be used alone or together with a 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, more preferably in an amount of 20 to 40 parts by weight, and more preferably in an amount of 25 to 35 parts by weight, based on 100 parts by weight of the natural leather waste. I can. When the aqueous emulsion is used within the above range, there is an advantage of improving the mechanical strength of the leather fabric and preventing deterioration of the texture.

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

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 the crosslinking agent, a sulfur crosslinking agent, An isocyanate crosslinking agent or a melamine crosslinking agent may be used alone or in combination of two or more, and in the case of a co-crosslinking agent, a trifunctional monomer may be used, for example, triallyl cyanurate, triallyl isocyanurate ( triallyl isocyanurate), trimethylolpropane trimethacylate, diethylene glycoldimethacrylate, sulfide-based or guanidine-based crosslinking aids, alone or in combination of two or more.

Specifically, the isocyanate crosslinking agent, hexamethylene diisocyanate biuret, hexamethylene diisocyanate isocyanurate (hexamethylene diisocyanateisocyanurate), toluene diisocyanate / trimethylolpropane reactant (toluene diisocyanate / trimethylolpropane diisocyanate), toluene diisocyanate There are isocyanurate (toluene diisocyanate isocyanurate) and isophorone diisocyanate isocyanurate (isophorone diisocyanate isocyanurate), and melamine-based crosslinking agents include melamine resin, methylated melamine resin, butylated melamine resin, and isobutylated And melamine resin.

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

In addition, in the case of the co-crosslinking agent, 1 to 15 parts by weight are used based on 100 parts by weight of the base material, but when the content of the co-crosslinking agent is less than 1 part by weight, there is a concern that compression recovery characteristics may be deteriorated, and when it exceeds 15 parts by weight, moldability There is a fear that this decreases and shrinkage of the leather fabric may occur.

Fillers are usually used to improve mechanical strength, but in the case of recycled leather fabrics, they are added to fill gaps between powders, and are either alone or two of magnesium carbonate, calcium carbonate, silica, aluminum chloride, magnesium chloride, or barium chloride. It can be used in combination as described above.

The content of the filler is preferably 5 to 10 parts by weight based on 100 parts by weight of the substrate. If the content of the filler is less than the above range, the effect of filling the gap is low, so that the recycled leather fabric may shrink or deform, and if it exceeds the above range, the surface of the leather fabric may become 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 (S3) of preparing the mixed sludge may be performed by mixing 10 to 50 parts by weight of a binder based on 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 based on 100 parts by weight of natural leather waste. In this case, the combination of natural leather waste can be performed smoothly, and at the same time, the unique feeling of leather can be expressed, thereby improving the texture.

If the binder is mixed within the above range, there is a risk that defects may occur because the natural leather waste is not properly combined, and if the binder is mixed beyond the above range, the texture is deteriorated, resulting in a unique feeling of leather. It can be a difficult problem to do.

At this time, mixing of the mixture and the binder may be performed by stirring them evenly 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 water (S4), the stability of the binder emulsion is collapsed through pH adjustment, and the water may be separated by phase separation. By separating the water in this way, a mixture formed into a sheet can be obtained. The leather fabric of the present invention can be formed from the mixture formed in the form of a sheet.

In addition, the pH can be adjusted in the range of 2 to 6 by using a chemical that is acidic by dissolving in water such as aluminum sulfate. Preferably, it can be adjusted in the range of 2 to 5 pH.

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

That is, the step of adding the heat control additive (S0) may be performed in step S3, step S4, or may be performed in step S3 and step 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 at an initial step in which the water begins 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, the step of adding the heat control additive (S0) may provide a function of controlling the release and absorption of heat of the leather fabric of the present invention 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 depending on the degree of heat absorption, and due to this property, there is a limitation that it can be used in the manufacture of a leather fabric only at a melting point or lower. In addition, even if it is used in the manufacture of leather fabrics to manufacture leather fabrics, there is a limit to seeping out of the leather fabric like wet clothes in the 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 separating water 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 limitation by adding a phase change material in a form impregnated in the pores of the porous body or in a form supported in a capsule. In this case, when a leather fabric is manufactured using a phase change material, not only can the heat control function be smoothly performed even in a temperature range exceeding the melting point, but also there is an effect that the phenomenon of seeping out of the conventional leather fabric does not appear. In addition, since an oil layer is not formed on the top of the leather fabric, there is an effect that it is easy to continuously manufacture the leather fabric.

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

For example, if the purpose is to be used as a product used in everyday life, it is preferable to use a heat control additive having a melting point in the range of 10 to 30°C because it must be able to detect heat absorption and release in the range of human life. If the melting point is less than 10°C, it may be difficult for the user to recognize the heat insulation effect against the cold, and it may be difficult to express the heat absorbing function because it exists in a molten state during interseasons such as spring and autumn. In addition, if the melting point exceeds 30°C, it is difficult for the user to recognize the cooling sensation, breathability, and the like, and the utility value may be deteriorated.

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 of use by using a small amount.

For example, when the melting point of a commonly commercially available phase change material is 10 to 30°C, it has a heat control performance of 150 to 250 J/g on average. 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 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 preferably added in an amount of 5 to 25 parts by weight based on 100 parts by weight of the water to be mixed. If the heat control additive is added beyond the above range, mixing may not be performed smoothly, and a large amount of the heat control additive may be concentrated in the upper layer due to the difference in density, 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 release, and thus has an effect that can be utilized in a variety of temperature ranges. In addition, when the leather fabric is used as an upper for shoes, the feeling of wearing is improved by the effect of delaying the rate of sweating by absorbing heat. 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 has the effect of delaying cooling by releasing heat, so it can be used in a variety of products.

The heat control performance of the leather fabric can be set in various ranges according to the intended use of the fabric to perform the manufacturing process of the leather fabric, and in order to use it for fashion materials used in everyday 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 release is degraded, and if it exceeds the above range, the performance is excellent, but if the fabric thickness is about 1 mm, the content of the heat control additive increases. It can be difficult to manufacture. In addition, in the case of excessively high performance, a fabric thickness of about 4 mm or more must be manufactured in order to continuously maintain high performance, and thus there is a limitation that is not suitable 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 substrate, the heat control additive is a phase change material, and the phase change material is in the pores of the porous body. Provides a leather fabric using natural leather waste contained in an impregnated form or supported in a capsule.

The description of the leather fabric will be omitted because 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 placed 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% solid 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 a sludge. Then, it was transferred through a pipe to adjust the pH to phase-separate the emulsion of the binder to separate water to prepare a leather fabric having 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 placed in the tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, 30 parts by weight of a 35% solid PU emulsion was added as a binder and stirred for about 20 minutes to prepare a sludge. It is transferred through a pipe to adjust the pH to phase-separate the emulsion of the binder, and at the point where water begins to separate, 40 parts by weight of the hybrid heat control additive impregnated in the pores of the porous body are uniformly added to a thickness of about 0.6 mm. A leather fabric was prepared.

Example 3

100 parts by weight of pulverized natural leather waste and 250 parts by weight of water were placed in the tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, as a binder, 30 parts by weight of a 35% solid PU emulsion and 50 parts by weight of a capsule additive were added and stirred for about 20 minutes to prepare a sludge. Thereafter, it was transferred through a pipe to adjust the pH to phase-separate the emulsion of the binder, and 20 parts by weight of the capsule-type heat control additive was uniformly added at the point where the water began to separate to prepare a leather fabric having 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 placed in the tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, as a binder, 30 parts by weight of a 35% solid PU emulsion and 70 parts by weight of a capsule-type heat control additive were added and stirred for about 20 minutes to prepare sludge. Thereafter, this was transferred through a pipe to adjust the pH to phase-separate the emulsion of the binder, and separate water 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 placed in the tank and stirred for about 10 minutes to disperse the natural leather waste in water. Here, as a binder, 30 parts by weight of a 35% solid PU emulsion and 20 parts by weight of a heat absorption-releasing additive having a melting temperature of about 24° C. were added and stirred for about 20 minutes to prepare a sludge. Thereafter, this was transferred through a pipe to adjust the pH to phase-separate the emulsion of the binder to separate water to prepare a leather fabric. However, since the heat control additive in the form of oil remained on the top of the leather fabric, it was not possible to continuously manufacture the fabric.

Experimental example One. Heat control Measure performance

The heat control performance of the leather fabrics prepared from 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 in good condition, △: Sludge is not uniform X: Sludge is 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)
(Part by weight) 30 30 30 30 30 Capsule type
Heat control additives ^{2 )}
(Part by weight) 20 - 70 70 - Hybrid type
Heat control additives ^{3 )}
(Part by weight) - 40 - - - Liquid heat control additives ^{4 )}
(Part by weight) - - - - 20 Step of adding heat control additive S3 S4 S3, S4 S3 S3 Observation of the appearance of mixed sludge ○ ○ ○ △ X Leather fabric
Thermal control performance (J/g) 16 21 33 - -

_{1) Shinchang Industry Co., Ltd. Polyurethane emulsion , WPU -10, solid content 35%, 2) Of Ennet (Korea) Capsule additive, 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 formed satisfactorily. 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 addition amount of the heat control additive is excessive compared to the content of water, so that an excessive amount of powder is present on the surface of the mixed sludge, so that the formation of the mixed sludge is not easy.

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

In this regard, FIGS. 3A to 3C are DSC (Differential Scanning Calorimetry) graphs of a heat control additive according to a preferred embodiment of the present invention. 3A is a DSC graph of a capsule type heat control additive, FIG. 3B is a DSC graph of a hybrid type heat control additive, and FIG. 3C is a DSC graph of a liquid heat control additive (phase transition 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.

In addition, Figure 4 is a graph showing the heat control performance of the leather fabric according to an 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. FIG. 4, it can be seen that the heat control performance of the leather fabric of the present invention has an excellent value of about 16.52 J/g.

Claims (7)

It is based on a mixture containing natural leather waste and a binder,
It contains a heat control additive uniformly distributed in the substrate,
The heat control additive is a phase change material, and the phase change material is a leather fabric using natural leather waste contained in a form impregnated in the pores of a porous body or supported in a capsule.
The method of claim 1,
A leather fabric using natural leather waste, characterized in that it contains 5 to 90 parts by weight of a heat control additive based on 100 parts by weight of the natural leather waste.
Pulverizing the natural leather waste into a powder form and mixing the natural leather waste powder with water to prepare a mixture;
Preparing a binder of a base material obtained by mixing rubber latex and an aqueous emulsion or a base material comprising an aqueous emulsion alone;
Mixing the mixture and the binder to prepare a mixed sludge;
Separating water from the mixed sludge; and
Including, obtaining a leather fabric after separating the water,
A heat control additive is added in at least one of the steps of preparing the mixed sludge and separating water,
The heat control additive is a phase change material, and the phase change material is a method of manufacturing a leather fabric using natural leather waste that is added in a form impregnated in the pores of a porous body or supported in a capsule.
The method of claim 3,
When the heat control additive is added in the step of separating the water, the heat control additive is added at an initial step in which the water starts to be separated.
The method of claim 3,
The step of separating the water is a method for manufacturing a leather fabric using natural leather waste, characterized in that the water is separated by phase-separating the emulsion of the binder through pH adjustment.
The method of claim 5,
The pH control is a method for manufacturing a leather fabric using natural leather waste, characterized in that it is carried out by adjusting the pH in the range of 2 to 6.
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 based on 100 parts by weight of natural leather waste,
The heat control additive is a method for manufacturing a leather fabric using natural leather waste, characterized in that the addition of 5 to 90 parts by weight based on 100 parts by weight of natural leather waste.

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