Self-tearing leather and preparation method thereof

Abstract

The present invention relates to the field of leather technology, and in particular to a self-tearing leather and a preparation method thereof. The technical solution comprises a leather body, wherein the upper surface of the leather body is provided with a mesh layer 1, a mesh layer 2 and a self-tearing coating in sequence, and the mesh layer 1 and the mesh layer 2 are both provided with a plurality of air holes; the leather body is provided with a plurality of groups of through holes, and the through holes are provided with reinforcing wires, and the leather body is also provided with a plurality of through holes, and the through holes are provided with interlaced wires; the through holes are arranged perpendicularly to the through holes, and the mesh layer 1 and the mesh layer 2 are provided with a plurality of interlaced holes for the reinforcing wires to pass through. The leather of the present invention has improved toughness, strength and ductility, and can meet the high tensile performance requirements of the leather component layers of the self-tearing leather, improve the aesthetics of the leather, and broaden the scope of use.

Description

Technical Field

[0001] The present invention relates to the technical field of leather, in particular to self-tearing leather and a preparation method thereof. Background Art

[0002] Leather is a denatured, non-perishable animal hide obtained through physical and chemical processes such as dehairing and tanning. Leather is composed of natural protein fibers tightly woven in three dimensions. Its surface features a distinctive grain layer with a natural grain pattern, a lustrous sheen, and a pleasant feel. With the continuous improvement of people's living standards, people are increasingly concerned with the aesthetics of leather. However, leather, derived from the fur of animals such as cattle and sheep, inevitably bears defects such as brand marks, stall marks, and puncture scratches. To mask or eliminate these defects, either a thick coating is applied to the grain surface or the grain is ground down to create corrected leather. Both methods lose the natural grain and marks of the leather, obliterating its unique characteristics as a natural material. This leads to increasing homogenization and fails to meet people's growing demand for personalized and fashionable leather. Leather with tear marks on its surface can add interest and enhance its aesthetics. However, leather with self-tearing patterns requires repeated stretching during production, placing high demands on the toughness and tensile strength of the leather base. However, existing leather materials do not meet the toughness and tensile strength requirements for self-tearing leather. In view of this, we propose a self-tearing leather with high stretchability and toughness and a preparation method of the self-tearing leather. Summary of the Invention

[0003] The purpose of the present invention is to address the problems in the background technology that the toughness and stretchability of existing leather cannot meet the requirements for preparing self-tearing leather, and to propose a self-tearing leather with high stretchability and toughness and a method for preparing self-tearing leather.

[0004] The technical solution of the present invention is: a self-tearing leather, comprising a leather body, wherein a mesh layer 1, a mesh layer 2, and a self-tearing coating are sequentially provided on the upper surface of the leather body, wherein the mesh layer 1 and the mesh layer 2 are both provided with a plurality of ventilation holes;

[0005] The leather body is provided with a plurality of through holes, and reinforcement wires are provided through the through holes. The leather body is further provided with a plurality of through holes, and insertion wires are provided through the through holes.

[0006] Preferably, the through holes and the through holes are arranged perpendicularly to each other, and the mesh surface layer 1 and the mesh surface layer 2 are provided with a plurality of groups of through holes for the reinforcing wires to pass through.

[0007] Preferably, the reinforcing wires and the interlaced leads are made of polyester fibers.

[0008] A method for preparing self-tearing leather, the method specifically comprising the following steps:

[0009] Step 1: The leather components are formed into a leather body, a mesh layer 1, and a mesh layer 2, respectively, with through holes, through holes, breathable holes, and interlaced holes. The leather body, mesh layer 1, and mesh layer 2 are stacked in sequence and glued together, and multiple interlaced leads are passed through the through holes.

[0010] Step 2: Pass the reinforcing wire through the through holes in the mesh layer 1 and mesh layer 2 and the through holes in the leather body, and tighten both ends of the reinforcing wire so that the reinforcing wire passing through the mesh layer 2 is in a horizontally taut state;

[0011] Step 3: rewetting the crust leather after bonding in step 2, squeezing water, stretching and drying the crust leather;

[0012] Step 4: Prepare cracking slurry and apply the prepared cracking slurry on the upper surface of the mesh layer 2. After application, dry it in an oven and oscillate and soften it to obtain uniform tearing lines.

[0013] Preferably, the cracking slurry in step 4 comprises the following raw materials in parts by mass: 80-110 parts of pure acrylic resin, 12-24 parts of protein film-forming agent, 8-12 parts of polyurethane film-forming agent, 220-330 parts of anionic polyacrylic acid resin polymer, 3-9 parts of penetrant and 60-300 parts of water.

[0014] Preferably, the cracking slurry comprises the following raw materials in parts by mass: 80 parts of pure acrylic resin, 12 parts of protein film-forming agent, 8 parts of polyurethane film-forming agent, 220 parts of anionic polyacrylic acid resin polymer, 3 parts of penetrant and 60 parts of water.

[0015] Preferably, the cracking slurry comprises the following raw materials in parts by mass: 110 parts of pure acrylic resin, 24 parts of protein film-forming agent, 12 parts of polyurethane film-forming agent, 330 parts of anionic polyacrylic acid resin polymer, 9 parts of penetrant and 300 parts of water.

[0016] Preferably, the cracking slurry comprises the following raw materials in parts by mass: 95 parts of pure acrylic resin, 18 parts of protein film-forming agent, 10 parts of polyurethane film-forming agent, 270 parts of anionic polyacrylic acid resin polymer, 6 parts of penetrant and 180 parts of water.

[0017] Preferably, the protein film-forming agent is a combination of a casein film-forming agent and a modified casein film-forming agent, and the mass ratio of the casein film-forming agent to the modified casein film-forming agent is 1:1;

[0018] The penetrant is opening powder, which accounts for 0.1% of the crack surface slurry.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] 1. The present invention increases the overall tensile integrity of the leather by providing a first mesh layer and a second mesh layer in the leather component layer, making the connection between the layers more secure during the stretching operation. In addition, by providing interlaced holes, through holes, and through holes for passing reinforcing wires and inserting lead wires, the leather component layer has high elasticity and strength, and the leather performance is repeatedly guaranteed, ensuring that the strength and tensile properties meet the requirements in the later stretching process, thereby improving the leather properties. By applying a self-tearing coating, cracks can be prepared on the surface of the leather, thereby achieving the self-tearing texture effect of the leather and improving the aesthetics of the leather.

[0021] 2. The present invention optimizes the leather preparation process, so that the self-tearing pattern of leather can be completed quickly, making the preparation of self-tearing pattern leather simpler, and improving the aesthetics of the leather, thereby increasing leather sales;

[0022] 3. In summary, the toughness, strength and ductility of the leather of the present invention are all improved, which can meet the high tensile performance requirements of the leather component layers of self-tearing leather, improve the aesthetics of the leather, and broaden the field of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the self-tearing leather of the present invention is provided;

[0024] Figure 2 for Figure 1 Schematic diagram of the decomposition structure;

[0025] Figure 3 This is a schematic diagram of the cross section at AA;

[0026] Figure 4 Schematic diagram of the cross section of the leather body.

[0027] Figure numerals: 1. leather body; 2. mesh layer 1; 3. mesh layer 2; 4. self-tearing coating; 5. breathable hole; 6. insertion hole; 7. reinforcement line; 8. insertion lead; 11. through hole; 12. through hole. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figure 1-4 As shown, the self-tearing leather proposed by the present invention includes a leather body 1, the upper surface of which is sequentially provided with a mesh layer 1 2, a mesh layer 2 3, and a self-tearing coating 4, wherein the mesh layer 1 2 and the mesh layer 2 3 are each provided with a plurality of ventilation holes 5, and the leather body 1, the mesh layer 1 2, the mesh layer 2 3, and the self-tearing coating 4 are adhesively connected;

[0031] like Figure 2-4 As shown, the leather body 1 is provided with a plurality of through holes 11, and the through holes 11 are provided with reinforcing wires 7, and the mesh layer 1 2 and the mesh layer 2 3 are provided with a plurality of through holes 6 for the reinforcing wires 7 to pass through. The leather body 1 is also provided with a plurality of through holes 12, and the through holes 12 are arranged perpendicularly to the through holes 11, and the through holes 12 are provided with through leads 8. The reinforcing wires 7 and the through leads 8 are made of polyester fibers and are used to increase the toughness and integrity of the leather component layers to prevent the leather body 1 from tearing.

[0032] Example 2

[0033] Based on Example 1, the preparation method specifically includes the following steps:

[0034] Step 1: Leather body 1, mesh layer 1 2, and mesh layer 2 3 are respectively provided with through holes 11, through holes 12, ventilation holes 5, and insertion holes 6. The leather body 1, mesh layer 1 2, and mesh layer 2 3 are stacked in sequence and glued and pressed together. A plurality of insertion leads 8 are passed through the through holes 12.

[0035] Step 2: Insert the reinforcing wire 7 through the through-holes 6 provided on the mesh layer 1 2 and the mesh layer 2 3 and the through-hole 11 provided in the leather body 1 , and tighten both ends of the reinforcing wire 7 so that the reinforcing wire 7 passing through the mesh layer 2 3 tends to be in a horizontally taut state, thereby ensuring that the connection between the leather body 1 , the mesh layer 1 2 and the mesh layer 2 3 can be pulled by the reinforcing wire 7 while being glued, thereby achieving a stable connection effect;

[0036] Step 3: rewetting the crust leather after bonding in step 2, squeezing water, stretching and drying the crust leather;

[0037] Step 4: Prepare a cracking slurry, which includes the following raw materials in parts by weight: 80 parts of pure acrylic resin, 12 parts of protein film-forming agent, 8 parts of polyurethane film-forming agent, 220 parts of anionic polyacrylic acid resin polymer, 3 parts of penetrant, and 60 parts of water; the protein film-forming agent is a combination of casein film-forming agent and modified casein film-forming agent, and the mass ratio of the casein film-forming agent to the modified casein film-forming agent is 1:1; the penetrant is pull-opening powder, and the pull-opening powder accounts for 0.1% in the cracking slurry;

[0038] The prepared cracking slurry is applied to the upper surface of the mesh layer 2 3, dried in an oven, and oscillated and softened to obtain uniform tearing lines.

[0039] Example 3

[0040] Based on Example 1 and Example 2, the preparation method specifically includes the following steps:

[0041] Step 1: Leather body 1, mesh layer 1 2, and mesh layer 2 3 are respectively provided with through holes 11, through holes 12, ventilation holes 5, and insertion holes 6. The leather body 1, mesh layer 1 2, and mesh layer 2 3 are stacked in sequence and glued and pressed together. A plurality of insertion leads 8 are passed through the through holes 12.

[0042] Step 2: Pass the reinforcing wire 7 through the through-holes 6 provided in the mesh layer 1 2 and the mesh layer 2 3 and the through-hole 11 provided in the leather body 1 , and tighten both ends of the reinforcing wire 7 so that the reinforcing wire 7 passing through the mesh layer 2 3 tends to be in a horizontally taut state;

[0043] Step 3: rewetting the crust leather after bonding in step 2, squeezing water, stretching and drying the crust leather;

[0044] Step 4: Prepare a cracking slurry, which includes the following raw materials by weight: 110 parts of pure acrylic resin, 24 parts of protein film-forming agent, 12 parts of polyurethane film-forming agent, 330 parts of anionic polyacrylic acid resin polymer, 9 parts of penetrant, and 300 parts of water; the protein film-forming agent is a combination of casein film-forming agent and modified casein film-forming agent, and the mass ratio of the casein film-forming agent to the modified casein film-forming agent is 1:1; the penetrant is pull-opening powder, and the pull-opening powder accounts for 0.1% in the cracking slurry;

[0045] The prepared cracking slurry is applied to the upper surface of the mesh layer 2 3, dried in an oven, and oscillated and softened to obtain uniform tearing lines.

[0046] Example 4

[0047] Based on Example 1, Example 2 and Example 3, the preparation method specifically includes the following steps:

[0048] Step 1: Leather body 1, mesh layer 1 2, and mesh layer 2 3 are respectively provided with through holes 11, through holes 12, ventilation holes 5, and insertion holes 6. The leather body 1, mesh layer 1 2, and mesh layer 2 3 are stacked in sequence and glued and pressed together. A plurality of insertion leads 8 are passed through the through holes 12.

[0049] Step 2: Pass the reinforcing wire 7 through the through-holes 6 provided in the mesh layer 1 2 and the mesh layer 2 3 and the through-hole 11 provided in the leather body 1 , and tighten both ends of the reinforcing wire 7 so that the reinforcing wire 7 passing through the mesh layer 2 3 tends to be in a horizontally taut state;

[0050] Step 3: rewetting the crust leather after bonding in step 2, squeezing water, stretching and drying the crust leather;

[0051] Step 4: Prepare a cracking slurry, which includes the following raw materials in parts by weight: 95 parts of pure acrylic resin, 18 parts of protein film-forming agent, 10 parts of polyurethane film-forming agent, 270 parts of anionic polyacrylic acid resin polymer, 6 parts of penetrant, and 180 parts of water; the protein film-forming agent is a combination of casein film-forming agent and modified casein film-forming agent, and the mass ratio of the casein film-forming agent to the modified casein film-forming agent is 1:1; the penetrant is pull-opening powder, and the pull-opening powder accounts for 0.1% in the cracking slurry;

[0052] The prepared cracking slurry is applied to the upper surface of the mesh layer 2 3, dried in an oven, and oscillated and softened to obtain uniform tearing lines.

[0053] Self-tearing leather was prepared based on the preparation methods of Example 1 in combination with Example 2, Example 3, and Example 4. Twenty samples of the self-tearing leather prepared in Example 2, Example 3, and Example 4 were selected from each example, and conventional leather with self-tearing patterns was selected as a control. Performance tests were performed and the average values ​​of various data were taken. Specific test items included: maximum tensile strength test, elongation test, and flexural resistance test.

[0054] The following data is obtained:

[0055]

[0056] From the above data, it can be seen that the self-tearing leather prepared by the present invention has better maximum tensile strength, elongation and bending resistance than the control example, has excellent performance, and is not easily damaged during use.

[0057] The above specific embodiments are only several preferred embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A self-tearing leather, characterized in that: The leather body (1) comprises a leather body, wherein a mesh layer 1 (2), a mesh layer 2 (3) and a self-tearing coating (4) are sequentially provided on the upper surface of the leather body (1), and a plurality of air holes (5) are provided on the mesh layer 1 (2) and the mesh layer 2 (3); The leather body (1) is provided with a plurality of through holes (11), and the through holes (11) are provided with reinforcing wires (7). The leather body (1) is also provided with a plurality of through holes (12), and the through holes (12) are provided with through leads (8); The through holes (12) are arranged perpendicularly to the through holes (11), and the mesh layer 1 (2) and the mesh layer 2 (3) are provided with a plurality of through holes (6) for the reinforcing wires (7) to pass through. The reinforcing wire (7) and the interlaced lead wire (8) are made of polyester fibers; The reinforcing line (7) is not exposed on both sides of the self-tearing leather.

2. A method for preparing self-tearing leather according to claim 1, characterized in that: The preparation method specifically comprises the following steps: Step 1: The leather body (1), mesh layer 1 (2), and mesh layer 2 (3) are respectively provided with through holes (11), through holes (12), air holes (5), and insertion holes (6), and the leather body (1), mesh layer 1 (2), and mesh layer 2 (3) stacked in sequence are glued and pressed together, and a plurality of insertion leads (8) are passed through the through holes (12); Step 2: Pass the reinforcing wire (7) through the through holes (6) provided on the mesh layer 1 (2) and the mesh layer 2 (3) and the through hole (11) provided in the leather body (1), and tighten the two ends of the reinforcing wire (7) so that the reinforcing wire (7) passing through the mesh layer 2 (3) tends to be in a horizontal tension state; Step 3: rewetting the crust leather after bonding in step 2, squeezing water, stretching and drying the crust leather; Step 4: Prepare cracking slurry and apply the prepared cracking slurry on the upper surface of the mesh layer 2 (3). After application, dry it in an oven and oscillate and soften it to obtain uniform tearing lines.

3. The method for preparing self-tearing leather according to claim 2, characterized in that: The cracking slurry in step 4 includes the following raw materials by weight: 80-110 parts of pure acrylic resin, 12-24 parts of protein film-forming agent, 8-12 parts of polyurethane film-forming agent, 220-330 parts of anionic polyacrylic acid resin polymer, 3-9 parts of penetrant and 60-300 parts of water; The protein film-forming agent is a combination of a casein film-forming agent and a modified casein film-forming agent, and the mass ratio of the casein film-forming agent to the modified casein film-forming agent is 1:1; The penetrant is opening powder, which accounts for 0.1% of the crack slurry.

4. The method for preparing self-tearing leather according to claim 3, characterized in that: The cracking slurry in step 4 includes the following raw materials in parts by weight: 80 parts of pure acrylic resin, 12 parts of protein film-forming agent, 8 parts of polyurethane film-forming agent, 220 parts of anionic polyacrylic acid resin polymer, 3 parts of penetrant and 60 parts of water.

5. The method for preparing self-tearing leather according to claim 3, characterized in that: The cracking slurry in step 4 includes the following raw materials in parts by weight: 110 parts of pure acrylic resin, 24 parts of protein film-forming agent, 12 parts of polyurethane film-forming agent, 330 parts of anionic polyacrylic acid resin polymer, 9 parts of penetrant and 300 parts of water.

6. The method for preparing self-tearing leather according to claim 3, characterized in that: The cracking slurry in step 4 includes the following raw materials in parts by weight: 95 parts of pure acrylic resin, 18 parts of protein film-forming agent, 10 parts of polyurethane film-forming agent, 270 parts of anionic polyacrylic acid resin polymer, 6 parts of penetrant and 180 parts of water.

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