Waterproof bending-resistant sheep leather and waterproof performance detection method thereof

Abstract

The invention provides waterproof bending-resistant sheep leather which is characterized in that the waterproof bending-resistant sheep leather comprises an upper leather layer and a lower leather layer, a bonding layer is arranged between the upper leather layer and the lower leather layer, the opposite sides of the upper leather layer and the lower leather layer are of mutually corresponding wavy structures, an inorganic filling layer is arranged between the upper leather layer and the lower leather layer, and the inorganic filling layer is of a hollow structure. A waterproof layer is arranged on the side, away from the lower leather layer, of the upper leather layer, and a woven layer is arranged on the side, away from the upper leather layer, of the lower leather layer. The leather disclosed by the invention has the advantages of better waterproofness and bending resistance.

Description

Technical Field

[0001] The invention relates to the technical field of leather design, in particular to a waterproof and flex-resistant sheepskin leather and a method for detecting the waterproof performance thereof. Background Art

[0002] Leather is a material made from animal skin through a special tanning process. It is tough, durable, tactile, and colorful, and is widely used in clothing, shoes, furniture, decoration, and other fields. The tanning process usually includes degreasing, dyeing, tanning, and other steps, which can give leather different textures and appearances.

[0003] The prior art, such as the invention patent with publication number CN110923373B and titled "leather processing method, leather and leather products", includes the following steps: squeezing water from wet blue leather, shaving, weighing → rewetting → neutralization → filling and dyeing → grain filling → dry finishing ① → brushing crack resin → dry finishing ② → rewatering → greasing → finishing; the grain filling step includes adding 50-100% of 35-45°C water and 0.5-2.5% of multi-metal complex into a drum, rotating for 10-30 minutes; then adding 2-6% of plant tannin extract and 1-3% of maleic anhydride polymer, rotating for 30-60 minutes; finally adding 0.5-1.5% of formic acid, rotating for 20-40 minutes, adjusting the pH of the bath liquid to 3.6-3.8, draining, and washing with water.

[0004] The above leather has the problem of poor waterproofness in practical applications, which results in the need to provide a waterproof layer on the product after it is made into clothing, gloves or shoes, thereby increasing the processing cost of the corresponding products. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a waterproof and flex-resistant sheepskin leather and a method for detecting its waterproof performance, which are used to solve the technical problem of poor waterproofness of leather in the prior art.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A waterproof and flex-resistant sheepskin leather, characterized in that it comprises an upper skin layer and a lower skin layer, an adhesive layer is provided between the upper skin layer and the lower skin layer, the opposite sides of the upper skin layer and the lower skin layer are wavy structures corresponding to each other, an inorganic filling layer is provided between the upper skin layer and the lower skin layer, a waterproof layer is provided on the side of the upper skin layer facing away from the lower skin layer, and a woven layer is provided on the side of the lower skin layer facing away from the upper skin layer.

[0008] A method for testing the waterproof performance of waterproof and flex-resistant sheepskin leather is carried out in the following order:

[0009] S1. Hydrostatic pressure test: Fix the leather sample on the test device with the waterproof layer facing the test device. Apply a hydrostatic pressure of 1 bar to 3 bar through the test device for 5-10 minutes and record the test results.

[0010] S2. Spray test: Fix the leather sample on the spray device, with the side of the leather sample with the waterproof layer facing the spray device, spray water mist at a pressure of 0.4 bar to 0.8 bar for 10-30 minutes, and record the test results;

[0011] S3. Water impact test: Fix the leather sample on the flushing device with the waterproof layer facing the flushing device. Impact the surface of the leather sample with a water column height of 30-60cm for 5-10 minutes and record the test results.

[0012] Working principle:

[0013] During production, the waterproof layer is first coated on the top surface of the upper skin layer, and the woven layer is fixed to the bottom surface of the lower skin layer by means of stitches or adhesives. After installation, the upper skin layer and the lower skin layer are coated with an adhesive layer on the side with the wavy structure, and an inorganic filling layer is added between the upper skin layer and the lower skin layer. Finally, the upper skin layer and the lower skin layer are bonded and fixed to each other by the adhesive layer.

[0014] When testing the waterproof performance of leather after production, you can first use a hydrostatic pressure test device to apply hydrostatic pressure to the leather sample, and use the hydrostatic pressure test device to detect whether the leather has water seepage; then use a spray test device to simulate the spray test device of rainwater in a natural environment to detect the waterproof condition of the leather during actual use; further use a water impact resistance test device to test the water impact resistance of the leather.

[0015] Beneficial effects obtained:

[0016] First, the upper leather layer and the lower leather layer can effectively increase the overall strength of the leather through the two layers of leather and increase the service life of the leather.

[0017] Secondly, the inorganic filling layer can further increase the toughness and strength of the leather and improve the overall anti-deformation performance of the leather.

[0018] Third, it is equipped with a waterproof layer, which can effectively increase the waterproof performance of the leather and prevent the leather from becoming hard and moldy due to water seepage or soaking during use.

[0019] Fourthly, a woven layer is provided, which can effectively increase the comfort when worn and improve the breathability between the skin and leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional view of part of the structure of an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the braiding structure of the braided layer.

[0022] In the above drawings: 1, upper skin layer; 2, lower skin layer; 3, adhesive layer; 4, inorganic filling layer; 5, woven layer; 6, first waterproof layer; 7, second waterproof layer; 8, first braided wire; 9, second braided wire; 10, breathable cavity. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Example:

[0025] Reference Figure 1 and Figure 2 The present invention is a waterproof and flex-resistant sheepskin leather, comprising an upper skin layer 1 and a lower skin layer 2. An adhesive layer 3 is provided between the upper skin layer 1 and the lower skin layer 2. The adhesive layer 3 is a vinyl or acrylic adhesive. Such adhesives have high strength and good adhesion and can be used for bonding leather and other materials. The upper skin layer 1 and the lower skin layer 2 have a wavy structure on the opposite side thereof, and the wavy design can increase the actual bonding area between the upper skin layer 1 and the lower skin layer 2. Compared with plane bonding, the overall bonding strength can be improved. The wavy design can better disperse and transmit external forces, and improve the mechanical properties of the bonded joint, such as shear resistance and tensile resistance.

[0026] like Figure 1 As shown, an inorganic filling layer 4 is provided between the upper skin layer 1 and the lower skin layer 2. The inorganic filling layer 4 is stone powder particles or kaolin particles. The addition of this material can improve the rigidity of the overall leather and further increase the leather's anti-deformation ability. The upper skin layer 1 is provided with a waterproof layer on the side away from the lower skin layer 2. The waterproof layer includes a first waterproof layer 6 and a second waterproof layer 7. The first waterproof layer 6 is provided on the side of the upper skin layer 1 away from the lower skin layer 2, and the second waterproof layer 7 is provided on the side of the first waterproof layer 6 away from the upper skin layer 1. The first waterproof layer 6 is silicone oil or silicone emulsion. This material can penetrate into the leather fiber to form a hydrophobic coating to enhance the overall waterproofness of the leather. The second waterproof layer 7 is made of polytetrafluoroethylene or polyvinylidene fluoride. The above solution or emulsion can form a more hydrophobic protective film on the surface of the leather to further increase its waterproof performance.

[0027] like Figure 2As shown, a braided layer 5 is provided on the side of the lower leather layer 2 facing away from the upper leather layer 1, and the braided layer 5 is formed by weaving and winding a plurality of first braided wires 8 and a plurality of second braided wires 9, and a breathable cavity 10 is formed between every two first braided wires and every two second braided wires 9. The braided layer 5 is made of natural fiber material, which can improve the comfort of leather when used.

[0028] A method for testing the waterproof performance of waterproof and flex-resistant sheepskin leather is carried out in the following order:

[0029] S1. Hydrostatic pressure test. This test device is a closed test box or container that can apply hydrostatic pressure to the leather sample. When in use, the leather sample is fixed on the test device with the waterproof layer facing the test device. The test device applies a hydrostatic pressure of 1 bar to 3 bar for 5-10 minutes. Observe whether the leather has any penetration and record it.

[0030] S2. Spray test. This device usually includes a water nozzle, an atomizer and an adjustable water pressure system, which can produce uniform water mist spray. When in use, fix the leather sample on the spray device, so that the side of the leather sample with a waterproof layer faces the spray device, spray water mist at a pressure of 0.4 bar to 0.8 bar, and the spray time is 10-30 minutes. Record the test results;

[0031] S3. Water shock resistance test: This is a test device that can generate a certain water column impact. It usually includes a sink or water pipe system with adjustable water column height, which can apply water flow impact to the leather sample. When in use, the leather sample is fixed on the flushing device, so that the side of the leather sample with the waterproof layer faces the flushing device, and the surface of the leather sample is impacted with a water column height of 30-60cm for 5-10 minutes, and the test results are recorded.

[0032] Working principle:

[0033] During production, a waterproof layer is first coated on the top surface of the upper skin layer 1, and the woven layer 5 is fixed to the bottom surface of the lower skin layer 2 by means of stitches or adhesives. After installation, an adhesive layer 3 is coated on the side of the upper skin layer 1 and the lower skin layer 2 with the wavy structure, and an inorganic filling layer 4 is added between the upper skin layer 1 and the lower skin layer 2. Finally, the upper skin layer 1 and the lower skin layer 2 are bonded and fixed to each other by the adhesive layer 3.

[0034] When testing the waterproof performance of leather after production, you can first use a hydrostatic pressure test device to detect whether the leather has water seepage, and then use a spray test device to simulate the natural environment rain to test the waterproof situation in actual application, and further use a water impact test device to test the leather's resistance to water impact.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A waterproof and flex-resistant sheepskin leather, characterized in that: The invention comprises an upper skin layer (1) and a lower skin layer (2), wherein an adhesive layer (3) is arranged between the upper skin layer (1) and the lower skin layer (2), the upper skin layer (1) and the lower skin layer (2) have mutually corresponding wavy structures on opposite sides thereof, an inorganic filling layer (4) is arranged between the upper skin layer (1) and the lower skin layer (2), a waterproof layer is arranged on the side of the upper skin layer (1) facing away from the lower skin layer (2), and a woven layer (5) is arranged on the side of the lower skin layer (2) facing away from the upper skin layer (1).

2. The waterproof and flex-resistant sheepskin leather according to claim 1, characterized in that: The adhesive layer (3) is a vinyl or acrylic adhesive.

3. The waterproof and flex-resistant sheepskin leather according to claim 1, characterized in that: The inorganic filling layer (4) is stone powder particles or kaolin particles.

4. The waterproof and flex-resistant sheepskin leather according to claim 3, characterized in that: The waterproof layer comprises a first waterproof layer (6) and a second waterproof layer (7); the first waterproof layer (6) is arranged on a side of the upper epidermis (1) away from the lower epidermis (2); and the second waterproof layer (7) is arranged on a side of the first waterproof layer (6) away from the upper epidermis (1).

5. The waterproof and flex-resistant sheepskin leather according to claim 4, characterized in that: The first waterproof layer (6) is silicone oil or silicone emulsion.

6. The waterproof and flex-resistant sheepskin leather according to claim 4, characterized in that: The second waterproof layer (7) is made of polytetrafluoroethylene or polyvinylidene fluoride.

7. The waterproof and flex-resistant sheepskin leather according to claim 1, characterized in that: The braided layer (5) is formed by a plurality of first braided wires (8) and a plurality of second braided wires (9) being braided and wound around each other.

8. The waterproof and flex-resistant sheepskin leather according to claim 7, characterized in that: A breathable cavity (10) is formed between every two of the first braided wires and every two of the second braided wires (9).

9. The method for detecting the waterproof performance of the waterproof and flex-resistant sheepskin leather according to claim 1, characterized in that: Proceed in the following order: S1. Hydrostatic pressure test: Fix the leather sample on the test device with the waterproof layer facing the test device. Apply a hydrostatic pressure of 1 bar to 3 bar through the test device for 5-10 minutes and record the test results. S2. Spray test: Fix the leather sample on the spray device, with the side of the leather sample with the waterproof layer facing the spray device, spray water mist at a pressure of 0.4 bar to 0.8 bar for 10-30 minutes, and record the test results; S3. Water impact test: Fix the leather sample on the flushing device with the waterproof layer facing the flushing device. Impact the surface of the leather sample with a water column height of 30-60cm for 5-10 minutes and record the test results.

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