Production process of velvet-feeling double-sided microfiber leather

Abstract

The invention relates to the technical field of leather production, in particular to a production process of velvet-feeling double-sided microfiber leather, which comprises the following steps of base cloth manufacturing, softening, raising, dip dyeing, coating manufacturing, sanding, coloring, color fixing and edge cutting. According to the invention, the chinlon filaments and the dissolution-release sea-island composite filaments are used as raw materials, so that the cost is saved, animals are not hurt, and the produced velvet-feeling double-sided microfiber leather has good color fastness.

Description

Technical Field

[0001] The invention relates to the technical field of leather production, and in particular to a production process of suede-feel double-sided microfiber leather. Background Art

[0002] Although suede has a good texture, elegant appearance, good breathability, soft feel, and wear resistance, and is widely used in making clothing and shoes, it has the following shortcomings: (1) poor hydrolysis color fastness and color migration performance; (2) high cost; (3) limited thickness; and (4) animal skin is used as raw material, which harms animals.

[0003] Microfiber synthetic leather (abbreviated as microfiber leather) is a synthetic material made by combining microfibers with polyurethane. The three-dimensional interwoven structure of the microfibers acts as a supporting skeleton, while the polyurethane is distributed around the fibers, forming the synthetic leather into an organic whole. Its unique manufacturing process and the superior properties of the microfibers give it the feel and appearance of natural leather, while also boasting excellent mechanical, chemical, and heat resistance, making it an ideal alternative to natural leather. Compared to the limited production and high price of natural leather, microfiber leather offers higher production efficiency and lower costs, making it widely used in furniture, clothing, automobiles, luggage, footwear, and other applications. Current research on microfiber leather primarily focuses on environmental protection, flame retardancy, functional expansion (antibacterial / conductive), and thinness and lightweighting. Research on suede-like double-sided microfiber leather is relatively limited.

[0004] In view of this, the inventor of this case conducted in-depth research on the production process of velvety double-sided microfiber leather, which led to the creation of this case. Summary of the Invention

[0005] The purpose of the present invention is to provide a production process of suede-feel double-sided microfiber leather, so that the produced suede-feel double-sided microfiber leather has good color fastness.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A production process for suede-feel double-sided microfiber leather comprises the following steps: S1. Making a base fabric: Using nylon filaments and dissolved island-in-the-sea composite yarns as raw materials, laying a net, and weaving the base fabric by a knitting process; wherein the mass content of the nylon filaments is 65% to 75%, and the mass content of the dissolved island-in-the-sea composite yarn is 25% to 35%; S2 softening: the base fabric is softened, and then the first drying and shaping; S3 raising: using a raising machine to raise both sides of the base fabric to form a pile; S4 dyeing: using disperse dyes to dye the base fabric, and then drying and finalizing for a second time; S5. Coating production: A high-solid polyurethane composite resin having a solid content of 60% to 90% is evenly coated on both sides of the base fabric to form a coating, which is then dried and finalized for a third time; S6 sanding: using silicon carbide sandpaper to sand both sides of the base fabric; S7 coloring, color fixing: the 40% high solid content polyurethane composite resin and color paste mixed slurry evenly roll coated on both sides of the base fabric, color fixing, and then the fourth drying and shaping; S8. Fifth drying and shaping, trimming.

[0007] As a preferred embodiment of the present invention, the model of the nylon filament in S1 is PA6 or PA66, the specification of the nylon filament is 50D / 72F or 75D / 144F, the fineness of the eluted sea-island composite yarn is 0.05-0.1D, and the number of islands is 37.

[0008] As a preferred embodiment of the present invention, the knitting process in S1 is a weft knitting process.

[0009] As a preferred embodiment of the present invention, the temperature of the first drying and shaping in S2 is 140-160° C. and the time is 3-5 minutes.

[0010] As a preferred embodiment of the present invention, the raising machine in S3 is a double-roller steel wire raising machine, which first raises one side of the base fabric twice, and then raises the other side of the base fabric twice, and the density of the pile is greater than 1500 pieces / cm 2 The length of the villi is 0.8 to 1.2 mm.

[0011] As a preferred embodiment of the present invention, the temperature of the second drying and shaping in S4 is 150-170° C., and the time is 2-4 minutes.

[0012] As a preferred embodiment of the present invention, the coating weight in S5 is 20 to 30 g / m 2 The temperature of the third drying and shaping is 160-180°C and the time is 2-3 minutes.

[0013] As a preferred embodiment of the present invention, the mesh number of the silicon carbide sandpaper in S6 is 200 to 400 meshes, and the density of the hair after sanding is greater than or equal to 2000 pieces / cm 2 The length of the villi is 0.5 to 1.0 mm.

[0014] As a preferred embodiment of the present invention, the content of the color paste in S7 is 5% to 15%, the temperature of the fourth drying and setting is 140 to 180° C., and the time is 2 to 5 minutes.

[0015] As a preferred embodiment of the present invention, the fifth drying and setting in S8 is performed at a temperature of 140-160° C. and for a time of 3-5 minutes.

[0016] The present invention has the following beneficial effects: 1. Using nylon filament and island-in-the-sea composite yarn as raw materials, it saves costs and does not harm animals. The velvety double-sided microfiber leather produced has good color fastness.

[0017] 2. Evenly roll the mixed slurry of 40% high solid polyurethane comprehensive resin and color paste on both sides of the base fabric. After the pigment is absorbed, fix the color to further improve the color fastness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the production process steps of the suede double-sided microfiber leather described in the present invention.

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Example 1

[0020] A production process of suede double-sided microfiber leather, referring to Figure 1 , including the following steps: S1. Production of base fabric: Using PA6 nylon filaments of 50D / 72F and 0.05D fineness and 37 islands of dissolved island composite yarn as raw materials, laying the net and weft knitting the base fabric; wherein the mass content of the nylon filaments is 65%, and the mass content of the dissolved island composite yarn is 35%; S2 softening: the base fabric is softened, and then the first drying and shaping; wherein the first drying and shaping temperature is 140 ℃, time is 3min; S3. Raising: A raising machine is used to raise both sides of the base fabric to form a pile; wherein the raising machine is a double-roller steel wire raising machine, which first raises one side of the base fabric twice, and then raises the other side of the base fabric twice, and the density of the pile is greater than 1500 pieces / cm 2 , the length of the villi is 0.8 to 1.2 mm; S4 dyeing: using disperse dyes to dye the base fabric, and then a second drying and shaping; wherein the second drying and shaping temperature is 150 ° C, time is 2min; S5. Coating preparation: a high solid content polyurethane composite resin with a solid content of 60% is evenly coated on both sides of the base fabric to form a coating, and then dried for a third time to set the coating; wherein the coating cloth weight is 20g / m2 The third drying and shaping process is performed at a temperature of 160°C for 2 minutes. S6. Sanding: Sanding both sides of the base fabric with silicon carbide sandpaper; wherein the mesh size of the silicon carbide sandpaper is 200 mesh, and the density of the fluff after sanding is greater than or equal to 2000 pieces / cm 2 , the length of villi is 0.5~1.0mm; S7. Coloring and fixing: A mixture of 40% high-solid polyurethane composite resin and color paste is evenly rolled on both sides of the base fabric to fix the color, and then a fourth drying and setting is performed; wherein the color paste content is 5%, the fourth drying and setting temperature is 140°C, and the time is 2 minutes; S8. The fifth drying and shaping process, and trimming; wherein the fifth drying and shaping process is performed at a temperature of 140°C and for 3 minutes. Example 2

[0021] A production process of suede double-sided microfiber leather, referring to Figure 1 , including the following steps: S1. Production of base fabric: Using PA66 nylon filaments of 75D / 144F and 0.1D fineness and 37 islands of dissolved island composite yarn as raw materials, laying the net and weft knitting the base fabric; wherein the mass content of the nylon filaments is 75%, and the mass content of the dissolved island composite yarn is 25%; S2 softening: the base fabric is softened, and then the first drying and shaping; wherein the first drying and shaping temperature is 160 ℃, time is 5min; S3. Raising: A raising machine is used to raise both sides of the base fabric to form a pile; wherein the raising machine is a double-roller steel wire raising machine, which first raises one side of the base fabric twice, and then raises the other side of the base fabric twice, and the density of the pile is greater than 1500 pieces / cm 2 , the length of the villi is 0.8 to 1.2 mm; S4 dyeing: using disperse dyes to dye the base fabric, and then a second drying and shaping; wherein the second drying and shaping temperature is 170 ° C, time is 4min; S5. Coating preparation: a high solid content polyurethane composite resin having a solid content of 60% is evenly coated on both sides of the base fabric to form a coating, and then dried for a third time to set the coating; wherein the coating cloth weight is 30g / m 2 The third drying and shaping process is performed at a temperature of 180°C for 3 minutes. S6. Sanding: Sanding both sides of the base fabric with silicon carbide sandpaper; wherein the mesh size of the silicon carbide sandpaper is 400 mesh, and the density of the fluff after sanding is greater than or equal to 2000 pieces / cm 2 , the length of villi is 0.5~1.0mm; S7. Coloring and fixing: A mixture of 40% high-solid polyurethane composite resin and color paste is evenly rolled on both sides of the base fabric to fix the color, and then a fourth drying and setting is performed; wherein the color paste content is 15%, and the fourth drying and setting temperature is 180°C for 5 minutes; S8. The fifth drying and shaping process, and trimming; wherein the fifth drying and shaping process is performed at a temperature of 160°C and for 5 minutes. Example 3

[0022] A production process of suede double-sided microfiber leather, referring to Figure 1 , including the following steps: S1. Production of base fabric: Using PA6 nylon filaments of 50D / 72F and 0.08D fineness and 37 islands of dissolved island-in-the-sea composite yarn as raw materials, laying the net and weft knitting the base fabric; wherein the mass content of the nylon filaments is 70%, and the mass content of the dissolved island-in-the-sea composite yarn is 30%; S2. Softening: The base fabric is softened and then dried for the first time; wherein the first drying temperature is 150°C for 4min; S3. Raising: A raising machine is used to raise both sides of the base fabric to form a pile; wherein the raising machine is a double-roller steel wire raising machine, which first raises one side of the base fabric twice, and then raises the other side of the base fabric twice, and the density of the pile is greater than 1500 pieces / cm 2 , the length of the villi is 0.8 to 1.2 mm; S4 dyeing: using disperse dyes to dye the base fabric, and then a second drying and shaping; wherein the second drying and shaping temperature is 160 ° C, time is 3min; S5. Coating preparation: a high solid content polyurethane composite resin having a solid content of 60% is evenly coated on both sides of the base fabric to form a coating, and then dried for a third time to set the coating; wherein the coating cloth weight is 25g / m 2 The third drying and shaping process is performed at a temperature of 170°C for 2 minutes. S6. Sanding: Sanding both sides of the base fabric with silicon carbide sandpaper; wherein the mesh size of the silicon carbide sandpaper is 300 mesh, and the density of the fluff after sanding is greater than or equal to 2000 roots / cm 2 , the length of villi is 0.5~1.0mm; S7. Coloring and fixing: A mixture of 40% high-solid polyurethane composite resin and color paste is evenly rolled on both sides of the base fabric to fix the color, and then a fourth drying and setting is performed; wherein the color paste content is 10%, the fourth drying and setting temperature is 160°C, and the time is 3 minutes; S8. The fifth drying and shaping process, and trimming; wherein the fifth drying and shaping process is performed at a temperature of 150°C and for 4 minutes.

[0023] In step S1, nylon filament and dissolvable island-in-the-sea composite yarn are used as raw materials. Nylon filament offers improved strength, abrasion resistance, and dimensional stability, while dissolvable island-in-the-sea composite yarn is fluffy and soft to the touch. Therefore, the fiber properties of these two fibers complement each other. Dissolvable island-in-the-sea composite yarn is a microfiber material composed of two different polymers. Its structure resembles an "island-in-the-sea" arrangement: the "island" component (typically a conventional fiber material such as polyester or nylon) is dispersed in the "sea" component (a soluble resin such as PVA or COPET). After the "sea" component dissolves, the remaining "island" fibers form microfiber bundles or a porous structure, achieving ultrafine fiber refinement. The base fabric woven using a weft knitting process has a fluffy and elastic structure, making it suitable for double-sided pile knitting. For higher stability, warp knitting techniques such as tricot knitting can be used, but the pile parameters must be adjusted to maintain softness.

[0024] In step S2, the base fabric is softened to optimize the hand feel; and then dried and shaped at a temperature of 140-160° C. to avoid color migration.

[0025] The raising process in step S3 can adjust the density of the pile to make the base fabric feel soft; firstly raising one side of the base fabric twice and then raising the other side of the base fabric twice can avoid excessive damage to the fibers.

[0026] After dyeing in step S4, the dye is dried and fixed at a temperature of 150-170° C. to prevent the dye from sublimating.

[0027] The solid content of the high-solid polyurethane composite resin in step S5 is between 60% and 90%, which can ensure the wear resistance, hydrolysis resistance and film density of the coating, making the coating less likely to crack.

[0028] In step S6, silicon carbide sandpaper is used to sand both sides of the base cloth to form a plush feeling, achieving a soft hand feel; the length of the plush is short to avoid lodging.

[0029] In step S7, a mixed slurry of 40% high-solid polyurethane composite resin and color paste is evenly rolled onto both sides of the base fabric. After the pigment is absorbed, a color fixing agent is used to fix the color. This can improve color fastness and reduce the possibility of fading and overflow. The components of the color fixing agent include epoxy resin, polycarbodiimide (PCD), etc. The content of the color paste can be adjusted according to the color depth requirements.

[0030] In step S8, the drying and shaping is completed in a 30-meter high-temperature furnace to avoid dry and wet rubbing, so that the product width is shaped and flat, that is, to ensure that the width of the product is consistent, to eliminate shrinkage or curling, and to have a flat surface without wrinkles, ripples or local deformation.

[0031] The suede-feel double-sided microfiber leather produced by the above process has good color fastness, and its bursting strength, bonding strength and folding resistance are all qualified.

[0032] It should be understood that the above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A production process for suede double-sided microfiber leather, characterized in that: The following steps are involved: S1. Making a base fabric: Using nylon filaments and dissolved island-in-the-sea composite yarns as raw materials, laying a net, and weaving the base fabric by a knitting process; wherein the mass content of the nylon filaments is 65% to 75%, and the mass content of the dissolved island-in-the-sea composite yarn is 25% to 35%; S2 softening: the base fabric is softened, and then the first drying and shaping; S3 raising: using a raising machine to raise both sides of the base fabric to form a pile; S4 dyeing: using disperse dyes to dye the base fabric, and then drying and finalizing for a second time; S5. Coating production: A high-solid polyurethane composite resin having a solid content of 60% to 90% is evenly coated on both sides of the base fabric to form a coating, which is then dried and finalized for a third time; S6 sanding: using silicon carbide sandpaper to sand both sides of the base fabric; S7 coloring, color fixing: the 40% high solid content polyurethane composite resin and color paste mixed slurry evenly roll coated on both sides of the base fabric, color fixing, and then the fourth drying and shaping; S8. Fifth drying and shaping, trimming.

2. The production process of suede double-sided microfiber leather according to claim 1, characterized in that: The model of the nylon filament in S1 is PA6 or PA66, the specification of the nylon filament is 50D / 72F or 75D / 144F, the fineness of the elution-type sea-island composite yarn is 0.05-0.1D, and the number of islands is 37.

3. The production process of suede double-sided microfiber leather according to claim 2, characterized in that: The knitting process described in S1 is a weft knitting process.

4. The production process of suede double-sided microfiber leather according to claim 3, characterized in that: The temperature of the first drying and setting in S2 is 140-160° C. and the time is 3-5 minutes.

5. The production process of suede double-sided microfiber leather according to claim 3, characterized in that: The raising machine in S3 is a double-roller steel wire raising machine, which first raises one side of the base fabric twice, and then raises the other side of the base fabric twice. The density of the pile is greater than 1500 pieces / cm 2 The length of the villi is 0.8 to 1.2 mm.

6. The production process of suede double-sided microfiber leather according to claim 3, characterized in that: The temperature of the second drying and shaping in S4 is 150-170° C. and the time is 2-4 minutes.

7. The production process of suede double-sided microfiber leather according to claim 3, characterized in that: The coating weight in S5 is 20-30 g / m 2 The temperature of the third drying and shaping is 160-180°C and the time is 2-3 minutes.

8. The production process of suede double-sided microfiber leather according to claim 3, characterized in that: The mesh number of the silicon carbide sandpaper in S6 is 200-400 mesh, and the density of the fluff after sanding is greater than or equal to 2000 pieces / cm 2 The length of the villi is 0.5 to 1.0 mm.

9. The production process of suede double-sided microfiber leather according to claim 3, characterized in that: The content of the color paste in S7 is 5% to 15%, and the temperature of the fourth drying and setting is 140 to 180° C., and the time is 2 to 5 minutes.

10. The production process of suede double-sided microfiber leather according to claim 3, characterized in that: The fifth drying and setting in S8 is performed at a temperature of 140 to 160° C. for 3 to 5 minutes.

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