Embossed noctilucent leather with luminous pattern groove bottoms and preparation method of embossed noctilucent leather

Abstract

The invention provides embossed noctilucent leather with luminous pattern groove bottoms and a preparation method of the embossed noctilucent leather, and belongs to the technical field of synthetic leather. The preparation method of the embossed noctilucent leather with luminous pattern groove bottoms comprises the following steps: S1, treating base cloth; s2, embossing and shaping; s3, groove bottom noctilucent slurry filling is conducted, specifically, the noctilucent slurry is prepared from, by weight, 50-60 parts of waterborne acrylic resin, 30-40 parts of rare earth aluminate light storage powder, 2-4 parts of bentonite, 1-3 parts of a waterborne dispersing agent, 8-12 parts of a strontium aluminate exciting agent and 20-30 parts of deionized water, and the viscosity of the noctilucent slurry is 800-1200 mPa.s; and S4, curing and cleaning. The prepared embossed noctilucent leather is accurate in noctilucent effect positioning, environment-friendly and long in afterglow time, and the noctilucent layer is high in adhesive force.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of synthetic leather, in particular to a pattern groove bottom light-emitting embossed luminous leather and a preparation method thereof. BACKGROUND

[0002] The embossed luminous leather has attracted much attention due to its decorative and luminous functions, but the existing production method adopts the process of embossing after coating the whole luminous layer, resulting in that the pattern protrusions and groove bottoms are all luminous, the visual effect is messy and lacks design sense; part of the process of trying local luminous removes the luminous layer of the protrusions by engraving in the later stage, which is complicated and easy to damage the surface of the leather body. In addition, the traditional luminous layer relies on an oily resin carrier, has a large amount of organic solvent volatilization, poor environmental protection, and uneven dispersion of luminous powder, and has problems of weak luminous intensity, short afterglow time, and poor durability due to poor combination of the luminous layer and the base cloth. SUMMARY

[0003] In view of the above-mentioned deficiencies of the prior art, the present application provides a pattern groove bottom light-emitting embossed luminous leather and a preparation method thereof, which at least solves one of the above-mentioned deficiencies.

[0004] The present application provides a preparation method of a pattern groove bottom light-emitting embossed luminous leather, comprising the following steps: S1, base cloth treatment; S2, embossing and shaping; S3, groove bottom luminous paste coating, wherein the composition of the luminous paste is: 50-60 parts by weight of water-based acrylic resin, 30-40 parts by weight of rare earth aluminate light storage powder, 2-4 parts by weight of bentonite, 1-3 parts by weight of water-based dispersing agent, 8-12 parts by weight of strontium aluminate excitation agent, and 20-30 parts by weight of deionized water, and the viscosity of the luminous paste is 800-1200 mPa·s; S4, curing and cleaning.

[0005] According to the preparation method of the pattern groove bottom light-emitting embossed luminous leather provided by the present application, the rare earth aluminate light storage powder is one or more of SrAl2O4: Eu 2+ , Dy 3+ , Sr4Al 14 O 25 : Eu 2+ , Dy 3+ , Sr2MgSi2O7: Eu 2+ , Dy 3+ , and the particle size is 6-10 μm.

[0006] According to the preparation method of the embossed night light leather with the pattern groove bottom light emitting, in step S2, the embossing and shaping includes: selecting an embossing roller with a target pattern engraved on the surface, heating to 150-170 DEG C, adjusting the pressure to 0.3-0.5 MPa, and carrying out hot pressing treatment on the treated base fabric at a speed of 5-8 m / min to form the pattern protrusion and groove bottom structure, and then cooling for 10-15 seconds by a 20-25 DEG C cooling wheel to fix the pattern shape.

[0007] According to the preparation method of the embossed night light leather with the pattern groove bottom light emitting, in step S2, the height of the pattern protrusion is 0.3-0.6 mm, and the depth of the groove bottom is 0.4-0.7 mm.

[0008] According to the preparation method of the embossed night light leather with the pattern groove bottom light emitting, in step S3, the filling and coating is carried out by using a mesh roller to roll coat the embossed leather body, the protrusion shape of the mesh roller is matched with the groove bottom shape, the mesh hole depth is 0.2-0.5 mm, so that the mesh roller only contacts with the groove bottom and fills the quantitative night light paste.

[0009] According to the preparation method of the embossed night light leather with the pattern groove bottom light emitting, in step S3, the coating amount of the night light paste is 18-25 g / ft2, and the pattern protrusion part is ensured to be free of night light paste residue.

[0010] According to the preparation method of the embossed night light leather with the pattern groove bottom light emitting, in step S4, the solidification includes: firstly pre-drying the filled and coated leather body at 75-85 DEG C for 8-12 minutes to preliminarily shape the night light paste, and then heating to 110-120 DEG C for 20-25 minutes for solidification.

[0011] According to the preparation method of the embossed night light leather with the pattern groove bottom light emitting, in step S4, the cleaning includes: using a flexible brush roller to gently brush the leather body surface at a rotating speed of 150-200 r / min to remove the trace night light paste residue possibly attached to the pattern protrusion part, and then blowing the surface by compressed air.

[0012] According to the preparation method of the embossed night light leather with the pattern groove bottom light emitting, in step S1, the base fabric treatment includes coating a primer layer on the space leather base fabric, the paste composition of the primer layer is: 100 parts of water-based polyurethane resin, 15-25 parts of superfine calcium carbonate filler, 3-8 parts of water-based color paste and 40-60 parts of deionized water, the viscosity is 1200-1800 Pa s, and the coating thickness is 0.12-0.18 mm.

[0013] The application further provides the embossed night light leather with the pattern groove bottom light emitting prepared by the above preparation method.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an embossed glow-in-the-dark leather with luminescent grooves and its preparation method. Through a process of embossing and shaping followed by precise coating, the glow-in-the-dark effect is achieved only at the bottom of the grooves, ensuring precise positioning of the glow. Simultaneously, a water-based system is used to enhance environmental friendliness, and the optimized glow-in-the-dark layer formula improves luminescence performance and adhesion. This glow-in-the-dark leather is suitable for applications such as footwear, bags, outdoor signage, and high-end apparel accessories, where both visual depth and functionality are required. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0016] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0017] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "specific implementation," or "some specific implementations," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0018] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0019] This invention provides a method for preparing embossed luminescent leather with luminescent grooves, comprising the following steps: S1, Base fabric treatment; S2, Embossing and shaping; S3. Filling the bottom of the trench with luminescent paste, wherein, by weight, the luminescent paste comprises: 50-60 parts of water-based acrylic resin, 30-40 parts of rare earth aluminate phosphorescent powder, 2-4 parts of bentonite, 1-3 parts of water-based dispersant, 8-12 parts of strontium aluminate activator, and 20-30 parts of deionized water, and the viscosity of the luminescent paste is 800-1200 mPa·s; S4. Curing and cleaning.

[0020] This invention employs a process of embossing and shaping followed by precise coating to achieve accurate positioning of the luminescent effect. Simultaneously, the luminescent paste utilizes a water-based system to enhance environmental friendliness, and the optimized luminescent layer formula strengthens its luminescence performance and adhesion. Specifically, the combination of rare-earth aluminate phosphorescent powder and strontium aluminate activator synergistically enhances luminescence performance, resulting in an afterglow time exceeding 12 hours. The use of water-based acrylic resin and deionized water as the medium aligns with environmental trends and is suitable for leather products sensitive to odors and toxicity.

[0021] Adding bentonite as a thixotropic agent and anti-settling agent effectively prevents the high-density rare earth powder from settling and agglomerating in the slurry. Combined with an aqueous dispersant, this ensures the uniformity and stability of the slurry during storage and use. In summary, this invention successfully integrates high-performance luminescent materials into a stable and environmentally friendly aqueous system, guaranteeing the operability of industrial production and product consistency.

[0022] In the above technical solution, the aqueous dispersant includes anionic dispersants (such as sodium polyacrylate and lignin sulfonate), nonionic dispersants (such as fatty alcohol polyoxyethylene ether), and polymeric dispersants (such as modified polyacrylate copolymers). In this invention, modified polyacrylate copolymers are preferred for better compatibility with other components.

[0023] In some embodiments of the present invention, the rare earth aluminate phosphorescent powder is SrAl2O4:Eu 2+ , Dy 3+ Sr4Al 14 O 25 Eu 2+ , Dy 3+ Sr2MgSi2O7: Eu 2+ , Dy 3+ One or more of the following, with a particle size of 6-10 μm. The above particle size is beneficial to the dispersion stability of the luminescent paste.

[0024] In some embodiments of the present invention, step S2 includes: selecting an embossing roller with the target pattern engraved on its surface, heating it to 150-170°C, adjusting the pressure to 0.3-0.5MPa, and hot-pressing the treated base fabric at a speed of 5-8m / min to form a raised pattern and groove bottom structure. After embossing, the pattern is fixed by a cooling wheel at 20-25°C for 10-15 seconds.

[0025] The target pattern can be a lychee pattern, a geometric pattern, or other similar patterns.

[0026] Furthermore, in step S2, the height of the raised pattern is 0.3-0.6 mm, and the depth of the groove bottom is 0.4-0.7 mm. The height of the raised pattern and the depth of the groove bottom are related to the subsequent accurate filling of the groove bottom. This invention has found that controlling the height of the raised pattern and the depth of the groove bottom within the above-mentioned range is beneficial to achieving accurate filling.

[0027] Based on the above technical solution, in step S3, the filling process involves using an anilox roller to coat the embossed leather body. The raised shape of the anilox roller matches the shape of the groove bottom, and the depth of the groove is 0.2-0.5mm, ensuring that the anilox roller only contacts the bottom of the groove and fills it with a measured amount of luminescent paste. The groove bottom depth of 0.2-0.5mm on the anilox roller matches the groove bottom depth of 0.4-0.7mm, which is beneficial for filling only the bottom of the groove.

[0028] Preferably, in step S3, the amount of luminescent paste applied is 18-25 grams per square foot to ensure that there is no luminescent paste residue on the raised parts of the pattern.

[0029] In some embodiments of the present invention, in step S4, the curing includes: pre-baking the coated leather body at 75-85°C for 8-12 minutes to preliminarily set the luminescent paste, and then heating it to 110-120°C for 20-25 minutes to cure it.

[0030] In the above technical solution, the curing conditions not only affect the stability of the luminous layer, but also the bonding strength with the base fabric coating. By adopting the above curing conditions, both aspects can be taken into account.

[0031] In some embodiments of the present invention, step S4, the cleaning includes: using a flexible brush roller to lightly brush the surface of the leather at a speed of 150-200 r / min to remove trace amounts of luminous paste residue that may adhere to the raised parts of the pattern, and then blowing the surface with compressed air.

[0032] In some embodiments of the present invention, in step S1, the base fabric treatment includes applying a base coating to the space leather base fabric. The base coating slurry composition is: 100 parts of water-based polyurethane resin, 15-25 parts of ultrafine calcium carbonate filler, 3-8 parts of water-based color paste, and 40-60 parts of deionized water, with a viscosity of 1200-1800 Pa·s and a coating thickness of 0.12-0.18 mm.

[0033] In a preferred embodiment of the present invention, the method for preparing the embossed luminous leather with luminescent grooves includes the following steps: S1. Base fabric treatment: The base fabric is selected from space leather. Preparation of the primer coating slurry: Weigh 100 parts by weight of waterborne polyurethane resin, 15-25 parts by weight of ultrafine calcium carbonate filler, 3-8 parts by weight of waterborne color paste, and 40-60 parts by weight of deionized water. Mix and stir for 30-40 minutes, adjust the viscosity to 1200-1800 mPa·s, and filter through a 400-mesh filter. Apply the slurry to the surface of the space leather base fabric using a doctor blade, with a thickness of 0.12-0.18 mm. Dry at 90-100℃ for 10-15 minutes to form a smooth primer coating. The thickness of the treated base fabric is approximately 1.2 mm.

[0034] S2, Embossing and Shaping: Select an embossing roller with the target pattern engraved on its surface, heat it to 150-170℃, adjust the pressure to 0.3-0.5MPa, and perform hot pressing on the base fabric at a speed of 5-8m / min to form a pattern protrusion with a height of 0.3-0.6mm and a groove bottom structure with a depth of 0.4-0.7mm. After embossing, cool and set the pattern at 20-25℃ for 10-15 seconds to fix the pattern shape.

[0035] S3, Precise filling of luminescent paste at the bottom of the trench: Preparation of luminescent paste: Weigh 50-60 parts of water-based acrylic resin, 30-40 parts of rare earth aluminate phosphorescent powder, 2-4 parts of bentonite, 1-3 parts of water-based dispersant, 8-12 parts of strontium aluminate activator, and 20-30 parts of deionized water according to the following weight ratio. Mix and stir for 50-60 minutes, then filter through a 300-mesh filter and adjust the viscosity to 800-1200 mPa·s.

[0036] Filling process: A custom anilox roller (with a groove depth of 0.2-0.5mm) is used to apply the coating to the embossed leather. The anilox roller only contacts the bottom of the groove and fills in the luminescent paste in a fixed amount. The coating amount is controlled at 18-25 grams per square foot to ensure that there is no luminescent paste residue on the raised parts.

[0037] S4. Curing of the luminous layer and cleaning of the raised pattern: After coating, the leather body is sent into a drying oven and pre-dried at 75-85℃ for 8-12 minutes to allow the luminescent paste to initially set. Then, the temperature is raised to 110-120℃ to cure for 20-25 minutes, forming a luminescent layer that is tightly bonded to the bottom of the groove.

[0038] Use a flexible brush roller (150-200 r / min) to lightly brush the surface of the leather to remove any traces of luminous paste residue that may adhere to the raised areas of the pattern, and then blow the surface with compressed air.

[0039] This invention utilizes a pre-embossing followed by coating process to achieve a luminescent effect limited to the bottom of the patterned grooves. During the day, the embossed texture is highlighted, while at night, the luminescence at the bottom of the grooves forms a clear "light and shadow outline," solving the problem of messy luminescence in traditional products and significantly improving design flexibility. The entire process uses a water-based resin system, with no organic solvent evaporation, meeting environmental standards. The rare earth phosphorescent powder and strontium aluminate activator in the luminescent paste work synergistically, resulting in an afterglow duration of ≥12 hours and improved luminescence intensity compared to traditional products. The formulation of the luminescent paste and the pretreatment of the base fabric enhance the adhesion between the luminescent layer and the groove bottom, achieving satisfactory color fastness to rubbing under both dry and wet conditions. This invention eliminates the need for complex engraving processes, achieving localized luminescence through precise filling with an anilox roller. The batch-to-batch product qualification rate is ≥96%, making it suitable for large-scale continuous production.

[0040] This invention also provides an embossed luminescent leather with luminescent grooves prepared by any of the above-described methods. The luminescent leather obtained by this invention can be used in footwear, bags, outdoor signage, high-end apparel accessories, and other applications requiring both visual depth and functionality.

[0041] To facilitate understanding of the embossed luminous leather with luminescent grooves and its preparation method provided by the present invention, the following specific embodiments are used for illustration.

[0042] In the following examples, the aqueous dispersant is a modified polyacrylate copolymer. The particle size of the rare earth aluminate phosphorescent powder is 6-10 μm.

[0043] Example 1 This embodiment provides an embossed glow-in-the-dark leather with luminescent grooves, the preparation method of which is as follows: S1. Base fabric treatment: The base fabric is selected as aerospace leather. Preparation of the primer coating slurry: Weigh 100 parts by weight of water-based polyurethane resin, 20 parts by weight of ultrafine calcium carbonate filler, 5 parts by weight of water-based color paste, and 50 parts by weight of deionized water. Mix and stir for 35 minutes, adjust the viscosity to 1500 mPa·s, and filter through a 400-mesh filter. Apply the slurry to the surface of the aerospace leather base fabric with a thickness of 0.15 mm using a doctor blade, and dry at 90℃ for 15 minutes to form a smooth primer coating.

[0044] S2, Embossing and Shaping: An embossing roller with the target pattern engraved on its surface is selected, heated to 160℃, and the pressure is adjusted to 0.4MPa. The base fabric is hot-pressed at a speed of 6m / min to form a pattern protrusion with a height of 0.4mm and a groove bottom structure with a depth of 0.5mm. After embossing, the pattern is cooled and set at 22℃ for 12 seconds to fix the pattern shape.

[0045] S3, Precise filling of luminescent paste at the bottom of the trench: Preparation of luminescent paste: Weigh 55 parts of water-based acrylic resin, 35 parts of rare earth aluminate phosphorescent powder, 3 parts of bentonite, 2 parts of water-based dispersant, 10 parts of strontium aluminate activator and 25 parts of deionized water according to the weight ratio, mix and stir for 55 minutes, filter through a 300-mesh filter, and adjust the viscosity to 1000 mPa·s.

[0046] Filling process: A custom anilox roller (with a groove depth of 0.3mm) is used to apply the coating to the embossed leather. The anilox roller only contacts the bottom of the groove and fills in the luminescent paste in a fixed amount. The coating amount is controlled at 22 grams per square foot to ensure that there is no luminescent paste residue on the raised parts.

[0047] S4. Curing of the luminous layer and cleaning of the raised pattern: The coated leather body is sent into a drying oven and pre-dried at 80℃ for 10 minutes to allow the luminescent paste to initially set. Then, the temperature is raised to 115℃ to cure for 20 minutes, forming a luminescent layer that is tightly bonded to the bottom of the groove.

[0048] Use a flexible brush roller (180 r / min) to gently brush the surface of the leather to remove any traces of luminous paste residue that may adhere to the raised areas of the pattern, and then blow the surface with compressed air.

[0049] Example 2 This embodiment provides an embossed glow-in-the-dark leather with luminescent grooves, the preparation method of which is as follows: S1. Base fabric treatment: The base fabric is selected as aerospace leather. Preparation of the primer coating slurry: Weigh 100 parts by weight of water-based polyurethane resin, 15 parts by weight of ultrafine calcium carbonate filler, 3 parts by weight of water-based color paste, and 40 parts by weight of deionized water. Mix and stir for 35 minutes, adjust the viscosity to 1200 mPa·s, and filter through a 400-mesh filter. Apply the slurry to the surface of the aerospace leather base fabric with a thickness of 0.12 mm using a doctor blade, and dry at 90℃ for 15 minutes to form a smooth primer coating.

[0050] S2, Embossing and Shaping: An embossing roller with the target pattern engraved on its surface is selected, heated to 150℃, and the pressure is adjusted to 0.5MPa. The base fabric is hot-pressed at a speed of 6m / min to form a pattern protrusion with a height of 0.3mm and a groove bottom structure with a depth of 0.4mm. After embossing, the pattern is cooled and set at 22℃ for 12 seconds to fix the pattern shape.

[0051] S3, Precise filling of luminescent paste at the bottom of the trench: Preparation of luminescent paste: Weigh 55 parts of water-based acrylic resin, 35 parts of rare earth aluminate phosphorescent powder, 3 parts of bentonite, 2 parts of water-based dispersant, 10 parts of strontium aluminate activator and 25 parts of deionized water according to the weight ratio, mix and stir for 55 minutes, filter through a 300-mesh filter, and adjust the viscosity to 1000 mPa·s.

[0052] Filling process: A custom anilox roller (with a cell depth of 0.2mm) is used to apply the coating to the embossed leather. The anilox roller only contacts the bottom of the groove and fills in the luminescent paste in a fixed amount. The coating amount is controlled at 22 grams per square foot to ensure that there is no luminescent paste residue on the raised parts.

[0053] S4. Curing of the luminous layer and cleaning of the raised pattern: The coated leather body is sent into a drying oven and pre-dried at 80℃ for 10 minutes to allow the luminescent paste to initially set. Then, the temperature is raised to 115℃ to cure for 20 minutes, forming a luminescent layer that is tightly bonded to the bottom of the groove.

[0054] Use a flexible brush roller (180 r / min) to gently brush the surface of the leather to remove any traces of luminous paste residue that may adhere to the raised areas of the pattern, and then blow the surface with compressed air.

[0055] Example 3 This embodiment provides an embossed glow-in-the-dark leather with luminescent grooves, the preparation method of which is as follows: S1. Base fabric treatment: The base fabric is selected as aerospace leather. Preparation of the primer coating slurry: Weigh 100 parts by weight of water-based polyurethane resin, 25 parts by weight of ultrafine calcium carbonate filler, 8 parts by weight of water-based color paste, and 60 parts by weight of deionized water. Mix and stir for 40 minutes, adjust the viscosity to 1800 mPa·s, and filter through a 400-mesh filter. Apply the slurry to the surface of the aerospace leather base fabric with a thickness of 0.18 mm using a doctor blade, and dry at 100℃ for 10 minutes to form a smooth primer coating.

[0056] S2, Embossing and Shaping: An embossing roller with the target pattern engraved on its surface is selected, heated to 160℃, and the pressure is adjusted to 0.5MPa. The base fabric is hot-pressed at a speed of 6m / min to form a pattern protrusion with a height of 0.6mm and a groove bottom structure with a depth of 0.7mm. After embossing, the pattern is cooled and set at 22℃ for 12 seconds to fix the pattern shape.

[0057] S3, Precise filling of luminescent paste at the bottom of the trench: Preparation of luminescent paste: Weigh 60 parts of water-based acrylic resin, 35 parts of rare earth aluminate phosphorescent powder, 3 parts of bentonite, 3 parts of water-based dispersant, 12 parts of strontium aluminate activator and 25 parts of deionized water according to the weight ratio, mix and stir for 60 minutes, filter through a 300-mesh filter, and adjust the viscosity to 1200 mPa·s.

[0058] Filling process: A custom anilox roller (with a cell depth of 0.4mm) is used to apply the coating to the embossed leather. The anilox roller only contacts the bottom of the groove and fills in the luminescent paste in a fixed amount. The coating amount is controlled at 22 grams per square foot to ensure that there is no luminescent paste residue on the raised parts.

[0059] S4. Curing of the luminous layer and cleaning of the raised pattern: The coated leather is placed in a drying oven and pre-dried at 80°C for 10 minutes to allow the luminescent paste to initially set. Then, the temperature is raised to 120°C and cured for 20 minutes to form a luminescent layer that is tightly bonded to the bottom of the groove.

[0060] Use a flexible brush roller (180 r / min) to gently brush the surface of the leather to remove any traces of luminous paste residue that may adhere to the raised areas of the pattern, and then blow the surface with compressed air.

[0061] Example 4 This embodiment provides an embossed glow-in-the-dark leather with luminescent grooves, the preparation method of which is as follows: S1. Base fabric treatment: The base fabric is selected as aerospace leather. Preparation of the primer coating slurry: Weigh 100 parts by weight of water-based polyurethane resin, 20 parts by weight of ultrafine calcium carbonate filler, 5 parts by weight of water-based color paste, and 50 parts by weight of deionized water. Mix and stir for 35 minutes, adjust the viscosity to 1500 mPa·s, and filter through a 400-mesh filter. Apply the slurry to the surface of the aerospace leather base fabric with a thickness of 0.15 mm using a doctor blade, and dry at 90℃ for 15 minutes to form a smooth primer coating.

[0062] S2, Embossing and Shaping: An embossing roller with the target pattern engraved on its surface is selected, heated to 160℃, and the pressure is adjusted to 0.4MPa. The base fabric is hot-pressed at a speed of 6m / min to form a pattern protrusion with a height of 0.4mm and a groove bottom structure with a depth of 0.5mm. After embossing, the pattern is cooled and set at 22℃ for 12 seconds to fix the pattern shape.

[0063] S3, Precise filling of luminescent paste at the bottom of the trench: Preparation of luminescent paste: Weigh 55 parts of water-based acrylic resin, 35 parts of rare earth aluminate phosphorescent powder, 3 parts of bentonite, 2 parts of water-based dispersant, 10 parts of strontium aluminate activator and 25 parts of deionized water according to the weight ratio, mix and stir for 55 minutes, filter through a 300-mesh filter, and adjust the viscosity to 1000 mPa·s.

[0064] Filling process: A custom anilox roller (with a groove depth of 0.5mm) is used to apply the coating to the embossed leather. The anilox roller only contacts the bottom of the groove and fills in the luminescent paste in a fixed amount. The coating amount is 26 grams per square foot to ensure that there is no luminescent paste residue on the raised parts.

[0065] S4. Curing of the luminous layer and cleaning of the raised pattern: The coated leather body is sent into a drying oven and pre-dried at 80℃ for 10 minutes to allow the luminescent paste to initially set. Then, the temperature is raised to 115℃ to cure for 20 minutes, forming a luminescent layer that is tightly bonded to the bottom of the groove.

[0066] Use a flexible brush roller (180 r / min) to gently brush the surface of the leather to remove any traces of luminous paste residue that may adhere to the raised areas of the pattern, and then blow the surface with compressed air.

[0067] Comparative Example 1 This comparative example provides an embossed luminescent leather with luminescent grooves. The difference between its preparation method and that of Example 1 is that in step S3, the luminescent paste is prepared by weighing 55 parts of water-based acrylic resin, 42 parts of rare earth aluminate phosphorescent powder, 3 parts of bentonite, 2 parts of water-based dispersant, 3 parts of strontium aluminate activator, and 25 parts of deionized water according to the weight ratio. After mixing and stirring for 55 minutes, the mixture is filtered through a 300-mesh filter and the viscosity is adjusted to 1000 mPa·s.

[0068] Comparative Example 2 This comparative example provides an embossed glow-in-the-dark leather with luminescent grooves. The difference between its preparation method and that of Example 1 is that in step S1, space leather base fabric is directly selected without applying a base coating.

[0069] Performance testing Performance tests were conducted on the luminous leather of each embodiment and comparative example. The test items and results are shown in Table 1.

[0070] Table 1

[0071] The thickness testing steps are as follows: 1. Use a pointer-type thickness gauge to measure the thickness at three points along the width of the test piece, on the left, center, and right. The measurement points should form a straight line at the test piece.

[0072] 2. For samples where the sampling location cannot be determined, measure the thickness at 5 points, with the measurement points forming a cross shape.

[0073] For stiff leather, to avoid bending, it is recommended to take a small sample and measure the thickness at three points in a straight line. For the whole piece of leather, measure the thickness at five points on each part.

[0074] 3. Record the test data. The measurement results are expressed as the arithmetic mean [Data processing: Thickness = (Data 1 + Data 2 + Data 3 + Data 4 + Data 5) / 5].

[0075] Reference standard: GB / 8949-2008 "Polyurethane Dry Process Artificial Leather".

[0076] Gram weight test procedure: 1. The sample should be equilibrated in a laboratory environment for more than 8 hours.

[0077] 2. Use a cutting knife to cut three specimens that meet the standard size requirements in the left, center, and right directions of the sample. When cutting the specimens, please note that: the cut specimens should be at least 150mm away from the edge of the material; the surface of the cut specimens should be flat and free of wrinkles or holes.

[0078] 3. Use an electronic scale to accurately measure the mass of the cut sample and record the data.

[0079] 4. Data Processing: Gram Weight (g / m³) 2 = (Resulting weight) / (10000) mm 2 =Resulting weight / 0.01 m 2 Reference standard: GB / T4669-2008 "Textiles - Determination of mass per unit length and mass per unit area of ​​woven fabrics".

[0080] Tear strength test procedure: 1. Use a cutting knife to cut one sample each in the warp and weft directions of the sample.

[0081] 2. Clamp both ends of the sample onto the upper and lower clamps of the tensile testing machine, ensuring that the portion of the sample protruding from the upper clamp and the portion protruding from the lower clamp are aligned. Keep the sample perpendicular to one side. Set the tensile testing machine speed to 200 mm / min.

[0082] 3. Press the test button on the tensile testing machine to start the test. When the tensile testing machine completely tears the sample, record the maximum tensile force during the tearing process. Test at least 3 samples and take the average value as the final result.

[0083] Calculation result or judgment: Tear strength = maximum tensile force during the tearing process.

[0084] Peel strength test procedure: 1. Cut one sample from either the warp or weft section using scissors.

[0085] 2. Apply adhesive evenly to the front of the sample (leaving a 30mm notch), immediately fold the left and right sides of the sample together to bond them together, press them with a prototyping machine, and put them into an oven for 15-20 minutes. When the oven time is up, take out the sample and let it stand at room temperature for a period of time.

[0086] 3. Cut one sample from either the warp or weft section using a cutting tool.

[0087] 4. Clamp the two separate sides of the uncoated end of the sample onto the upper and lower clamps of the tensile testing machine. Set the speed of the tensile testing machine to 200 mm / min and start the tensile testing. During the test, pay attention to the changes in the sample until the test is completed.

[0088] Data processing: Average force (N) within the range / 9.8 / 2.54.

[0089] Tensile strength and elongation tests: 1. Use a cutting knife to cut one sample each in the warp and weft directions of the sample.

[0090] 2. Use a ruler to draw two lines in the middle of the sample, with a distance of 25mm between the lines and a width of 10mm.

[0091] 3. Clamp both ends of the marked sample onto the upper and lower clamps of the tensile testing machine, ensuring the distance between the clamps is 100mm. The portion of the sample protruding from the upper clamp should be the same as the portion protruding from the lower clamp. The sample should be held vertically, not tilted to one side, and should be in a natural position, without stretching or compression. Use the upper and lower clamps of the extensometer to clamp the sample onto the two marked lines. Set the tensile testing machine speed to 200mm / min.

[0092] Start the test by pressing the test button on the tensile testing machine. When the tensile testing machine breaks the sample, record the maximum tensile force of the sample at the time of breakage and the distance between the two marks at the time of breakage.

[0093] Result calculation or determination: Tension = Maximum force (N) / 9.8 Elongation = (gauge length when the specimen breaks / original gauge length of the specimen) * 100%.

[0094] Color fastness to rubbing test procedure:

[0095] 1. Use a cutting knife to cut two clean, flat, wrinkle-free, and undamaged samples, each measuring 200mm x 50mm.

[0096] 2. Place the sample on the friction platform of the rubbing fastness tester and keep the sample surface flat.

[0097] 3. Set the load of the testing machine to 9N, the friction head to be a circular friction head, the friction speed to 60 times / minute, and the number of friction cycles to 10.

[0098] 4. Dry friction: Place a white standard cotton cloth (dry) on the friction head of the friction rod, lower the support rod, and rub back and forth 10 times.

[0099] 5. Wet friction: 5.1 First, weigh the white standard cotton fabric using an electronic scale. Then, soak the white standard cotton fabric in distilled water, absorb excess water with filter paper, and calculate the water absorption rate using an electronic scale. The water absorption rate of the cotton fabric should be controlled between 95% and 105%.

[0100] 5.2 Next, put the pressed standard cotton cloth (wet) onto the friction head of the friction rod, lower the support rod, and rub back and forth 10 times.

[0101] 5.3 Allow the damp cotton cloth to air dry naturally at room temperature.

[0102] 5.4 Staining rating of dry and wet cotton fabrics shall be performed in a standard light source box under standard light source or natural light and with a gray scale conforming to GB-251.

[0103] Afterglow duration: Refer to standard GB / T 40296.

[0104] The results above show that the embodiments of the present invention, through the process of embossing followed by coating, achieve a luminous effect limited to the bottom of the patterned grooves. During the day, the embossed three-dimensional effect is highlighted, and at night, the bottom of the grooves glows, forming a clear "light and shadow outline," solving the problem of messy luminescence in traditional products. The entire process uses a water-based resin system, with no organic solvent evaporation, meeting environmental standards. The rare earth phosphorescent powder and strontium aluminate activator in the luminescent paste work synergistically, resulting in an afterglow duration of ≥12 hours and improved luminescence intensity compared to traditional products. The formulation of the luminescent paste and the pretreatment of the base fabric enhance the adhesion between the luminescent layer and the bottom of the grooves, and the color fastness to rubbing under both dry and wet conditions meets the standards.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing embossed luminescent leather with luminescent grooves at the bottom, characterized in that, Includes the following steps: S1, Base fabric treatment; S2, Embossing and shaping; S3. Filling the bottom of the trench with luminescent paste, wherein, by weight, the luminescent paste comprises: 50-60 parts of water-based acrylic resin, 30-40 parts of rare earth aluminate phosphorescent powder, 2-4 parts of bentonite, 1-3 parts of water-based dispersant, 8-12 parts of strontium aluminate activator, and 20-30 parts of deionized water, and the viscosity of the luminescent paste is 800-1200 mPa·s; S4. Curing and cleaning.

2. The method for preparing embossed luminescent leather with luminescent grooves according to claim 1, characterized in that, The rare earth aluminate phosphor is SrAl2O4:Eu 2+ , Dy 3+ Sr4Al 14 O 25 Eu 2+ , Dy 3+ Sr2MgSi2O7: Eu 2+ , Dy 3+ One or more of them, with a particle size of 6-10 μm.

3. The method for preparing embossed luminescent leather with luminescent grooves according to claim 1, characterized in that, In step S2, the embossing and shaping includes: selecting an embossing roller with the target pattern engraved on its surface, heating it to 150-170℃, adjusting the pressure to 0.3-0.5MPa, and hot-pressing the treated base fabric at a speed of 5-8m / min to form a raised pattern and groove bottom structure. After embossing, the pattern is fixed by a cooling wheel at 20-25℃ for 10-15 seconds.

4. The method for preparing embossed luminescent leather with luminescent grooves according to claim 3, characterized in that, In step S2, the height of the raised pattern is 0.3-0.6 mm, and the depth of the groove bottom is 0.4-0.7 mm.

5. The method for preparing embossed luminescent leather with luminescent grooves according to claim 4, characterized in that, In step S3, the filling process involves using an anilox roller to coat the embossed leather body. The anilox roller has a raised shape that matches the shape of the groove bottom, and the depth of the groove is 0.2-0.5mm, so that the anilox roller only contacts the bottom of the groove and fills in a certain amount of luminous paste.

6. The method for preparing embossed luminescent leather with luminescent grooves according to claim 5, characterized in that, In step S3, the amount of luminescent paste applied is 18-25 grams per square foot to ensure that there is no luminescent paste residue on the raised parts of the pattern.

7. The method for preparing embossed luminescent leather with luminescent grooves according to claim 1, characterized in that, In step S4, the curing process includes: pre-baking the coated leather body at 75-85℃ for 8-12 minutes to preliminarily set the luminescent paste, and then heating it to 110-120℃ for 20-25 minutes to cure it.

8. The method for preparing embossed luminescent leather with luminescent grooves according to claim 1, characterized in that, In step S4, the cleaning includes: using a flexible brush roller to lightly brush the surface of the leather at a speed of 150-200 r / min to remove trace amounts of luminous paste residue that may adhere to the raised parts of the pattern, and then blowing the surface with compressed air.

9. The method for preparing embossed luminescent leather with luminescent grooves according to claim 1, characterized in that, In step S1, the base fabric treatment includes applying a base coating to the space leather base fabric. The base coating slurry composition is: 100 parts of water-based polyurethane resin, 15-25 parts of ultrafine calcium carbonate filler, 3-8 parts of water-based color paste, and 40-60 parts of deionized water, with a viscosity of 1200-1800 Pa·s and a coating thickness of 0.12-0.18 mm.

10. A type of embossed glow-in-the-dark leather with luminescent grooves, characterized in that, It is prepared by the preparation method according to any one of claims 1-9.

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