JPH09221700A - Shape stabilization treatment of leather or shoes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating leather or shoes, capable of improving qualities of processed leather articles such as shoes using present leather and designing shape stabilization. SOLUTION: The surface of tanned leather is coated with a treating solution which is blended with one or plural resins of a thermosetting resin, a thermoplastic synthetic resin and a low-molecular cross-linkable synthetic resin 3 and a protein such as collagen, silk or flax so as to permeate the treating solution into at least a network layer 2 of the leather 1. Then the leather is naturally dried, heat-treated at 110 deg.C to 120 deg.C to raise a fiber density of the network layer constituting the leather 1 and to design shape stabilization of shoes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for stabilizing the shape of shoes made of leather and leather shoes.

[0002]

TECHNICAL BACKGROUND OF THE INVENTION Considering natural leather,
Humans raise animals such as cows and pigs to eat meat. Leather is obtained as a by-product. For this reason, even though research has been conducted to produce more delicious and high-quality meat, much research has not been done to improve the quality of leather. For example, in the case of cattle, what used to be mature cows for at least three years or longer is now made into adult cows in a short period of one to one and a half years. The structure has undergone major changes. That is, the fiber density of leather becomes coarse, especially the fibers of the silver surface are coarse, and the thickness is thin and the elongation is large. Particularly, when such a leather is used to process a shoe, the shape of the shoe changes with time. For this reason, in the leather industry and the shoe manufacturing industry, it is a fact that day and night are being researched in order to improve such a leather having a coarse fiber density and being easily stretched to a leather structure comparable to that in the past.

An object of the present invention is to provide a method for treating leather or shoes which improves the quality of leather processed products such as shoes using the present leather and stabilizes the morphology.

[0004]

Means for Solving the Problems The above object is to apply a treatment liquid prepared by mixing a single or a plurality of thermosetting synthetic resins, thermoplastic synthetic resins or low molecular weight crosslinkable synthetic resins to the floor surface of tanned leather. Then, while at least penetrating the treatment liquid into the reticular layer of the leather, naturally drying it and then subjecting it to preheating treatment, the fiber density of the reticular layer constituting the leather is increased to stabilize the morphology of the leather. To be done. The above-mentioned object is a thermosetting synthetic resin, a thermoplastic synthetic resin, or a treatment liquid obtained by mixing a single or a plurality of low-molecular crosslinkable synthetic resins,
Apply to the floor surface of the upper that constitutes the upper body of the shoe, and let the treatment liquid permeate at least the mesh layer of the leather and let it dry naturally, and heat the upper body in a posture in which it is caught in a wooden mold. It is achieved by treating the upper part to increase the fiber density of the leather mesh layer constituting the upper to stabilize the morphology of the upper. The above-mentioned object is to mix the protein such as collagen, silk or hemp with the treatment liquid according to claim 1 or 2 to obtain the intramolecular structure of leather,
This is achieved by increasing the intermolecular, intrafiber, and interfiber cross-linking, and at the same time further increasing the morphological stabilization of the leather or shoe with a treatment liquid that approximates the same properties as the leather fibers.

[0005]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an enlarged view showing the fiber structure of leather which has been subjected to the treatment method of the present invention.

The morphological stabilizer used in the morphological stabilization treatment method for leather of the present invention is as follows. (A) Thermosetting synthetic resins include phenolic synthetic resins, urea synthetic resins, melamine synthetic resins, alkyd synthetic resins and the like. (B) Thermoplastic synthetic resins include acrylamide synthetic resins and urethane synthetic resins. Examples of the low molecular weight crosslinkable synthetic resin (c) include polycarboxylic acid synthetic resins and quaternary ammonium salt synthetic resins. (D) Collagen protein, silk protein, hemp protein and the like are used as the leather fiber structure stabilizer.

[0007]

[Example 1] In the case of tanned leather (1) Preparation of water-soluble treatment liquid (volume ratio) (a) Polycarboxylic acid-based synthetic resin: 5 to 10% (b) Catalyst (polycarboxylic acid-based) Auxiliary agent for cross-linking of synthetic resin) ... 0.5 to 20. % (C) Collagen protein ………… 2-5% (d) Water ………………………… 83-92.5% (2) Treatment method The treatment liquid is brushed on the leather floor. The coating solution is applied manually by a method such as spraying with a spray gun or by spraying means with a spray gun, and the treatment solution is allowed to penetrate into at least the reticulated layer of leather, and then naturally dried for about 15 to 20 minutes. Then about 80-9
Preheat with hot air at 0 ° C. for about 2 minutes. By this treatment, as shown in FIG. 1, a cross-linking structure 3 is formed in the reticular layer 2 of the leather 1, and leather having a stabilized morphology is obtained. In the figure, 4 is a silver surface layer, and 5 is an intermediate layer between the silver surface layer and the mesh layer.

[0008]

[Example 2] In the case of shoe upper body (1) Preparation of treatment liquid (volume ratio) (a) Acrylic acid-based synthetic resin ......... 10 to 13% (b) Silicon-based synthetic resin (acrylic acid-based synthesis) Auxiliary agent for adjusting the texture of resin) ………… 1-3% (c) Collagen protein ………… 2-5% (d) Water ……………………………… 87-79% (2) Treatment method The treatment liquid is used to open the upper and back leather that make up the finished body, and is evenly applied to the floor surface of the upper leather by manual application such as with a brush or by spraying means with a spray gun, and this treatment liquid is applied. Approximately 1 after infiltrating at least the mesh layer of the upper
Allow to air dry for 5 to 20 minutes. Then, after the upper body is fished into a wooden mold, it is heat-treated with hot air at about 110 to 120 ° C. for about 3 minutes. As shown in FIG. 1, this treatment forms a cross-linking structure 3 in the mesh layer 2 of the leather 1, and the collagen protein 6 imparts the same properties as the fibers of the natural leather, thereby stabilizing the morphology. A shoe with an instep body is obtained.

[0009]

[Treatment effect] Table 1 shows the results of comparison between the untreated leather and Examples 1 and 2 in terms of the shrinkage rate of the leather and the three-dimensional deformation rate of the leather.

[Table 1] Although the shrinkage rate of leather and the three-dimensional deformation rate of leather in Example 1 are slightly inferior to those in Example 2, leather 1 of Example 1 is used to prepare a shoe upper. However, by heating this upper body in a wooden mold and then heat-treating it, the shrinkage rate of the leather and the three-dimensional deformation rate of the leather are substantially equal to the numerical values shown in Example 2 as a result of several experiments. Has been revealed.

[0010]

According to the configuration of the present invention as described above,
The following effects can be obtained. Thermosetting, thermoplastic and /
Alternatively, a treatment liquid mainly composed of a low-molecular cross-linkable synthetic resin or a treatment liquid obtained by adding a protein such as collagen, silk or hemp to it is naturally dried at least in a state of permeating the leather mesh layer, and then heat-treated. The fiber density of the mesh layer can be increased by simple means, or the fibers can be cross-linked to stabilize the morphology of the leather or upper body, and it is easy to improve the quality and product value of leather products. Can be achieved.

[Brief description of drawings]

FIG. 1 is an enlarged view showing a fiber structure of leather subjected to a treatment method of the present invention.

[Explanation of symbols]

 1 Leather 2 Reticulated Layer 3 Cross-Linked Structure 4 Silver Surface Layer 5 Intermediate Layer 6 Collagen, Silk or Hemp Protein

Claims (3)

[Claims] 1. A treatment liquid prepared by mixing a single or a mixture of thermosetting synthetic resin, thermoplastic synthetic resin or low molecular weight crosslinkable synthetic resin is applied to the floor surface of tanned leather to obtain at least the treatment liquid. A method for stabilizing the morphology of leather by allowing it to permeate the reticular layer of the leather, preliminarily heat-drying the reticular layer and then preliminarily heat-treating it to increase the fiber density of the reticular layer constituting the leather to stabilize the morphology of the leather. . 2. A treatment liquid obtained by mixing a thermosetting synthetic resin, a thermoplastic synthetic resin, or a low-molecular crosslinkable synthetic resin, alone or in combination, is applied to the floor surface of the upper leather constituting the upper body of the shoe. The treatment liquid is allowed to at least penetrate into the reticular layer of leather and naturally dried, and the upper body is subjected to heat treatment in a posture of being caught in a wooden mold to increase the fiber density of the reticular layer constituting the upper. A method for stabilizing the morphology of shoes, comprising stabilizing the morphology of leather. 3. The treatment solution according to claim 1, wherein proteins such as collagen, silk or hemp are mixed with the treatment liquid to enhance intramolecular, intermolecular, intrafiber and interfiber cross-linking of leather,
At the same time, a method for stabilizing the morphology of leather or shoes is further enhanced by a treatment liquid which has properties close to those of the fibers of leather.