JPH0427370Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] This invention relates to waterproof shoes that do not get stuffy, and can be applied to general men's shoes, women's shoes, golf shoes, mountain climbing shoes, and other leather shoes with sufficient waterproofness without sacrificing their texture. The purpose of the present invention is to provide waterproof shoes that have suitable anti-stuff properties. [Prior Art] Leather conventionally used as a material for shoes generally consists of a grainy surface layer consisting of a fine intertwining of fibers, an intermediate layer of collagen fibers consisting of a relatively rough intertwining of curved fiber bundles, and a coarse interlayer of collagen fibers. It is a structure mainly composed of intertwined fibers, such as a back reticular layer in which fibers are intertwined, and has excellent moisture permeability and moisture retention properties. Therefore, it is commonly used for shoes. However, on the other hand, leather has very low waterproofness, and because of its composition, when it contains water, it retains water and does not release it easily, so once it gets wet with rainwater, it does not dry easily. Therefore, leather paints are generally applied to the outer skin or the lining, but a thin coat is insufficient for waterproofing, and a thick coat impairs the appearance of the leather and reduces moisture permeability, making it difficult to use in practice. It has the following. As mentioned above, all conventional waterproofing treatments involve coating with a moisture-impermeable material, which greatly impairs moisture permeability. In addition, in order to maintain moisture permeability, water-repellent materials, such as silicone resin solutions or water emulsions, are absorbed and dried and fixed. Although moisture permeability is hardly inhibited, the ability to prevent rainwater absorption is low and insufficient.
Additionally, there is a problem in the sustainability of the water repellent during long-term use, especially in bent areas. [Problem to be solved by the invention] When waterproofing is performed using a hydrophobic coating of waterproof paint using the above-mentioned conventional technology, water absorption is prevented, but in proportion to the prevention ability. The porous structure, which is a characteristic of leather, is lost, and the leather loses its characteristics as a leather material. Furthermore, in the case of water repellent treatment, prevention of water absorption is not sufficient. Therefore, when molding leather shoes, it is necessary to have a structure that does not impair the texture and appearance of the leather, has little loss of moisture permeability, and provides sufficient waterproofness to the leather. is necessary. Therefore, the aim is to create waterproof shoes that prevent water from entering when worn in the rain, such as when walking in the rain with leather shoes or walking on damp grass in golf shoes, and which do not get stuffy when worn. [Means for solving the problem] In order to solve the above problem, a polymer with excellent properties such as high moisture permeability and low swelling property can be used. The solution of the polymer is used to apply a moisture-permeable polymer to the back of the upper or to the lining material, especially in the seams, in the molding of shoes so as not to impair the appearance and feel of the shoe. Then, a polymer solution and a sealing tape treatment are applied to make it completely waterproof. The polymer used has a moisture permeability of 1500g/ ^m2 .
24hr./45μ or more, water absorption swelling rate in the range of 0 to 30%,
Preferably, characteristic values in the range 0-15% of the polymer are used. The polyurethane elastomer used in this waterproof leather material is made by reacting polyethylene glycol with a molecular weight of 200 to 600 with an organic dicarboxylic acid alone or with a mixture of an organic dicarboxylic acid and caprolactone and/or a short chain polyol. is 17-70% and the molecular weight is 500
~3000 polyester polyol and reacting the polyester polyol with an organic polyisocyanate in the presence of a chain extender to obtain a polyurethane polymer with a polyoxyethylene content in the range of 15 to 62%. . The moisture permeability obtained from the above polymers is about 2000 to 3400 at a thickness of 45μ, and the water absorption swelling rate is mostly 0 to 3400.
In the range of 10%, up to 28% is exceptional. Therefore, the moisture permeability and water absorption swelling percentage should be appropriately selected depending on the usage conditions and application. Alternatively, "polyethylene glycol with an average molecular weight of 200 to 600 and a C=3 or more polyalkyl ether polyol with an average molecular weight of 500 to 3000 are used as a base polymer, and the polyethylene glycol content of the base polymer is in the range of 20 to 100%. A polyurethane polymer having a composition in which the ethylene oxide content of the obtained polymer is in the range of 15 to 60% by reacting a polyisocyanate and using a chain extender as necessary. The above water absorption swelling rate was measured by applying liquid polyurethane polymer onto a glass plate with a thickness of 45μ x width of 30mm x length of 150mm using an applicator.
A film was prepared, marked lines were placed on the film at 100 mm intervals, immersed in water at room temperature for 24 hours, taken out of the water after 24 hours, and the distance between the marked lines (l) immediately thereafter was measured. The ratio (%)=l×100/100×100 was calculated. Measurement of moisture permeability (g/m ²・24hr.)
Measurement was carried out using a film with a thickness of 45μ according to the method of JIS Z0208. As mentioned above, in forming the leather, a non-porous, moisture permeable polyurethane elastomer with a moisture permeability of 1500g/ ^m2・24hr./45μ or more and a water absorption swelling rate in the range of 0 to 30% is applied to the back side of the upper. , Furthermore, the main body of the shoe is created by applying the above elastomer as a seal for the sewing part and fusing the seal tape, and the necessary lining materials (lining fabric, lining leather) are attached to make the shoe waterproof. It is used to make shoes. [Function] The waterproof shoes of this invention are coated with an elastomer that has a moisture permeability of 1500 or more and a water absorption swelling rate of 30% or less on the back layer of the upper of the shoe leather, and the sewn parts are completely waterproofed. The moisture content of the collagen fibers on the back side of the leather is suppressed, the appearance and texture are maintained, and the formation of a moisture permeable and water resistant polymer layer prevents the infiltration of rainwater, etc., and has excellent moisture permeability. This prevents stuffiness and provides a comfortable feeling when worn. [Example] The coating liquid applied to the back layer of the upper of the shoe leather of the waterproof shoes of this invention has an ethylene oxide content of 46% as an example of the polyurethane elastomer.
100 parts of polyester polyol, 24 parts of isophorone diisocyanate (IPDI), and 9 parts of isophorone diamine were added to a polyurethane polymer with a water absorption swelling rate of 0 and a moisture permeability of 2540 g/m ² 24 hr./24 μ, and methyl ethyl ketone. (MEK)/Toluene/Isopropylacetone (IPA) = 1/
Non-volatile content (NV) 25 dissolved in a 1/1 mixed solvent
% polymer solution, 140 parts of toluene,
10 parts of IPA was added to make a 10% NV solution, and 20 parts of water was further added while stirring to prepare a coating liquid. The coating solution was applied to the back layer of the upper, and the basis weight was 30 g/m ² in this example. Seal tape treatment for the seams involves turning the toe leather and waist leather inside out during the sewing process of the shoe molding process, applying the above-mentioned coating liquid to the back side, and then fusing the sealing tape to seal the seams. Apply adhesive treatment such as The above-described process provides waterproofness.Next, the specific structure of this invention will be explained based on the drawings of the embodiment. FIG. 1 is a plan view showing an example of the implementation of the shoe upper molded product of this invention, 1 is a shoe upper molded product, 1a
is the upper leather. Figure 2 is a schematic enlarged cross-sectional view of the upper, in which 2 is a moisture-permeable polyurethane elastomer layer formed by applying the above-mentioned coating solution, 3 is the back layer of the upper, and 4 is the silver surface of the upper. It is a layer. Fig. 3 is a schematic enlarged sectional view showing the setting state of the sewing part of this invention. 5 is a sewing thread, 6 is a sealing tape (MELCO-BM- manufactured by Sun Kasei Co., Ltd.), and a hot melt adhesive type (the tape base material is nylon taffeta)
It is. When forming shoes using the upper leather obtained in the above example, the results of actually wearing the shoes made by pasting together the necessary lining fabric and lining leather are shown in the following actual wearing evaluation table. .

【table】

[Effect of idea]

The waterproof shoes of this invention have the functions mentioned in the above section, so they prevent water infiltration like untreated leather shoes, and suppress moisture content, so they dry quickly and are similar to leather shoes. The synergistic effect of these properties and the waterproof property of the moisture-permeable polymer provides leather shoes that are comfortable to wear in the rain.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a molded shoe upper, FIG. 2 is an enlarged schematic cross-sectional view showing the structure of the upper, and FIG. 3 is a schematic enlarged cross-sectional view of a sewn portion. 1 ... Shoe upper molded body, 1a... Upper leather, 2...
Moisture-permeable polyurethane elastomer layer, 3...Back layer of upper leather, 6...Seal tape.

Claims (1)

[Scope of utility model registration request] When molding leather shoes, moisture permeability is created in the back layer of the upper leather.
1500g/ ^m2・24hr./45μ or more, water absorption swelling rate 0~
A non-porous, moisture-permeable polyurethane elastomer in the range of 30% is applied, and the sewn parts are coated with the above elastomer and bonded with seal tape to form the main body of the shoe, and the lining material necessary for the shoe is applied. Waterproof shoes characterized by bonding and molding.