Leather embossing roller and its processing technology

Abstract

The present invention discloses a leather grain embossing roller and a processing technology thereof, and relates to the technical field of embossing rollers. In order to improve the surface wear resistance and corrosion resistance of the embossing roller, the present invention laser-clads the surface of a steel roller with an anti-corrosion and wear-resistant metal powder coating, and adds a nano-graphene material with self-lubricating properties thereto. By loading titanium dioxide on the surface of the nano-graphene material and reducing it, the surface of the nano-graphene is loaded with nano-titanium metal particles, thereby increasing the bonding strength between the nano-graphene and the alloy powder after laser melting, avoiding the peeling phenomenon of the coating during the subsequent pressing process, thereby ensuring the overall strength of the steel roller, improving the surface wear resistance and corrosion resistance of the steel roller, and effectively increasing the service life of the coating.

Description

Technical Field

[0001] The invention relates to the technical field of embossing rollers, in particular to a leather grain embossing roller and a processing technology thereof. Background Art

[0002] Embossing rollers are suitable for pressing patterns on the surfaces of products such as plastics, metals, leather and even glass and ceramics, thereby improving the surface aesthetics and feel of the products. During the pressing process of the embossing roller, the processed products will undergo surface deformation under the action of external force to retain the embossed pattern. In this process, the surface of the embossing roller will be subjected to a large external force, which will often cause significant wear on its surface after long-term use. In addition, due to the different processing materials, such as the pressing process of products such as artificial leather, the chemical substances in them will often corrode the surface of the embossing roller, thereby aggravating the wear of the roller surface and seriously affecting its service life. Summary of the Invention

[0003] The purpose of the present invention is to provide a leather grain embossing roller and a processing technology thereof to solve the problems raised in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solution: a processing technology for a leather grain embossing roller, comprising the following steps:

[0005] S1. Preparation of leather grain embossing roller;

[0006] The surface of the steel roller blank is polished with sandpaper. After polishing, the surface is cleaned with anhydrous ethanol and deionized water, dried, and a resin coating is applied to the surface and dried. The resin coating in a predetermined area is ablated with a laser to form an ablation pattern on the surface of the embossing roller blank. The entire roller is immersed in nitric acid, heated to 45-60° C., and acid-etched for 5-25 minutes. The roller is then taken out and the remaining coating on the surface is removed with a cleaning agent. The surface is then cleaned again with anhydrous ethanol and acetone for 2-5 times to obtain a leather-grained embossing roller blank.

[0007] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0008] S21. The nanographene material was dispersed in deionized water and dispersed by ultrasonic vibration for 1-2 hours. Then, a KH-550 silane coupling agent was added thereto at a volume of 20-80% of the volume of deionized water. After mixing for 3-5 minutes, ammonia was added dropwise to adjust the pH value to 10-11. After heating to 55-65°C, ion irradiation was performed for 2-4 hours. After that, anhydrous ethanol with a volume of 3-5 times that of deionized water was added and mixed. After centrifugation, the precipitate was washed with anhydrous ethanol for 2-3 times to obtain amino-modified graphene.

[0009] S22. The amino-modified graphene was dispersed in anhydrous ethanol and ultrasonically dispersed for 1-2 hours. Glacial acetic acid was added to adjust the pH to 4-5. Tetrabutyl titanate and deionized water were then added and stirred for 2-4 hours. The precipitate was separated by centrifugation and vacuum dried to a constant weight. The resulting product was placed in a hydrogen and argon atmosphere, heated to 600-650°C, and reduced at high temperature for 15-30 minutes. The product was then cooled by nitrogen to obtain modified nanographene.

[0010] S23. Iron, chromium, nickel, cobalt, and titanium were placed in a ball mill, ground to the desired particle size, and then mixed. After heating to 2100-2300 ° C, the mixture was melted, spray granulated, cooled, and sieved to obtain an alloy powder with a particle size of 30-50 μm. The alloy powder was mixed with modified nanographene and shaken for 5-15 minutes to obtain a corrosion-resistant and wear-resistant metal powder coating.

[0011] S3. Preheat the leather grain embossing roller blank to 300-350°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5-10g / min, the laser cladding power is 2.5-3kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0012] Furthermore, in step S1, after being polished with sandpaper, the surface roughness of the steel roller blank is 0.1-0.5 μm.

[0013] Furthermore, in step S1, the ablation pattern is dermatoglyphics.

[0014] Furthermore, in step S21, the mass ratio of the nanographene, deionized water and kH-550 silane coupling agent is (0.05-0.1):1:(0.2-0.8).

[0015] Furthermore, in step S21, during the ion irradiation reaction, the ion beam energy is 5-10 KeV, and the ion beam current density is 2-4 μA / cm 2 .

[0016] Furthermore, in step S22, the mass ratio of the amino-modified graphene to tetrabutyl titanate and deionized water is 5:(2-10):(30-50).

[0017] Furthermore, in step S22, the volume ratio of hydrogen to argon in the hydrogen and argon atmosphere is (1-3): (7-9).

[0018] Furthermore, in step S23, the alloy powder is composed of 45-55 parts of iron, 15-20 parts of chromium, 5-10 parts of nickel, 3-5 parts of cobalt, and 10-20 parts of titanium, in parts by weight.

[0019] Furthermore, in step S23, the mass ratio of the alloy powder to the modified nano-graphene is 10:(0.3-0.8).

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In order to improve the surface wear resistance and corrosion resistance of the embossing roller, the present invention laser-clads the surface of the steel roller with anti-corrosion and wear-resistant metal powder coating, thereby improving the surface wear resistance and corrosion resistance while ensuring the overall strength of the steel roller.

[0022] The present invention first uses nanographene material as a raw material, disperses it in a KH-550 silane coupling agent, increases the number of amino groups on its surface under ion irradiation, thereby improving the surface activity of the nanographene, and then places it in tetrabutyl titanate. Utilizing the hydrolysis property of tetrabutyl titanate in water, nano-titanium dioxide is deposited on the surface of the nanographene. The entire nanographene is then transferred to a reducing atmosphere of hydrogen. At a high temperature of more than 600°C, the hydrogen reduces the titanium dioxide on the surface of the nanographene into nano-scale titanium metal particles.

[0023] On this basis, the present invention uses iron, chromium, nickel, cobalt and titanium as raw materials, melts them and granulates them to obtain alloy powder with a particle size of 30-50 microns. The iron element accounts for the largest proportion in the alloy powder, which can effectively combine with the steel roller during laser cladding, thereby ensuring that the formed coating has sufficient bonding strength with the steel roller, avoiding the peeling of the coating during the subsequent pressing process. The incorporation of chromium, nickel and cobalt elements can ensure the corrosion resistance of the coating formed by the alloy powder after cladding; at the same time, the present invention also adds a titanium element component to the alloy powder, thereby ensuring that during subsequent laser cladding, the nano-titanium metal particles on the surface of the modified nano-graphene can be combined with the alloy powder, thereby improving the bonding strength of the wear-resistant coating formed by the nano-graphene and the alloy powder; and in this process, since the nano-graphene material has excellent self-lubricating properties, the friction of the coating can be effectively reduced, and the service life of the coating can be effectively increased. DETAILED DESCRIPTION

[0024] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0025] The components of the steel roll blanks used in the examples and comparative examples of this application are as follows:

[0026] 0.042-0.045% C, 2.14-2.22% Cr, 0.21-0.36% Si, 0.52-0.6% Mn, 0.51-0.64% Ni, 1.05-1.14% Mo, 0.05-0.1% Nb, <0.025% S, <0.030% P, balance Fe;

[0027] The nanographene material used in this application has a sheet diameter of 5-10 microns and a thickness of 3-10 nm;

[0028] Example 1. A process for processing a leather grain embossing roller, comprising the following steps:

[0029] S1. Preparation of leather grain embossing roller;

[0030] The surface of the steel roller blank was polished with sandpaper until the surface roughness was 0.1-0.5 μm, and then the surface was cleaned with anhydrous ethanol and deionized water, dried, and a resin coating was applied to the surface and dried. The resin coating in a predetermined area was ablated by laser, and a leather-like pattern was formed on the surface of the embossing roller blank. The entire roller was immersed in nitric acid with a concentration of 30 wt%, heated to 45° C., and acid-etched for 10 minutes. The roller was taken out, and the remaining coating on the surface was removed with a cleaning agent. The surface was then cleaned again with anhydrous ethanol and acetone for three times to obtain a leather-like embossing roller blank.

[0031] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0032] S21. Disperse 5 parts of nanographene material by weight in 100 parts of deionized water. After ultrasonic dispersion for 1 hour, add 20 parts of KH-550 silane coupling agent. Continue mixing for 3 minutes, then add ammonia water to adjust the pH to 10.5. After heating to 60°C, set the ion beam energy to 5 KeV and the ion beam current density to 2 μA / cm 2 ion irradiation reaction for 2h, adding anhydrous ethanol 3 times the volume of deionized water to mix, centrifugal filtration, and continue to wash the precipitate with anhydrous ethanol 2-3 times to obtain amino-modified graphene;

[0033] S22. 5 parts by weight of amino-modified graphene were dispersed in anhydrous ethanol, ultrasonically dispersed for 1 hour, and then glacial acetic acid was added to adjust the pH to 4.5. 2 parts of tetrabutyl titanate and 30 parts of deionized water were added thereto, and the mixture was stirred for 2 hours. After centrifugation and precipitation, the mixture was vacuum dried to constant weight. The resulting product was placed in a mixed gas atmosphere of hydrogen and argon with a volume ratio of 2:8, heated to 600°C, and reduced at high temperature for 15 minutes, and then cooled by nitrogen to obtain modified nanographene.

[0034] S23. In parts by weight, 51.5 parts of iron, 17.3 parts of chromium, 8.4 parts of nickel, 4.1 parts of cobalt, and 17.2 parts of titanium were placed in a ball mill, ground to the desired particle size and mixed, heated to 2100 ° C for melting, spray granulated, cooled and sieved to obtain an alloy powder with a particle size of 30-50 μm, which was mixed with modified nano-graphene in a mass ratio of 10:0.3, and shaken and blended for 5 min to obtain a corrosion-resistant and wear-resistant metal powder coating;

[0035] S3. Preheat the leather grain embossing roller blank to 300°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5g / min, the laser cladding power is 2.5kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0036] Example 2. A process for processing a leather grain embossing roller, comprising the following steps:

[0037] Compared with Example 1, this embodiment increases the ion beam energy and density in step S21;

[0038] S1. Preparation of leather grain embossing roller;

[0039] The surface of the steel roller blank was polished with sandpaper until the surface roughness was 0.1-0.5 μm, and then the surface was cleaned with anhydrous ethanol and deionized water, dried, and a resin coating was applied to the surface and dried. The resin coating in a predetermined area was ablated by laser, and a leather-like pattern was formed on the surface of the embossing roller blank. The entire roller was immersed in nitric acid with a concentration of 30 wt%, heated to 45° C., and acid-etched for 10 minutes. The roller was taken out, and the remaining coating on the surface was removed with a cleaning agent. The surface was then cleaned again with anhydrous ethanol and acetone for three times to obtain a leather-like embossing roller blank.

[0040] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0041] S21. Disperse 5 parts of nanographene material by weight in 100 parts of deionized water. After ultrasonic dispersion for 1 hour, add 20 parts of KH-550 silane coupling agent. Continue mixing for 3 minutes, then add ammonia water to adjust the pH to 10.5. After heating to 60°C, set the ion beam energy to 10 KeV and the ion beam current density to 4 μA / cm 2 ion irradiation reaction for 2h, adding anhydrous ethanol 3 times the volume of deionized water to mix, centrifugal filtration, and continue to wash the precipitate with anhydrous ethanol 2-3 times to obtain amino-modified graphene;

[0042] S22. 5 parts by weight of amino-modified graphene were dispersed in anhydrous ethanol, ultrasonically dispersed for 1 hour, and then glacial acetic acid was added to adjust the pH to 4.5. 2 parts of tetrabutyl titanate and 30 parts of deionized water were added thereto, and the mixture was stirred for 2 hours. After centrifugation and precipitation, the mixture was vacuum dried to constant weight. The resulting product was placed in a mixed gas atmosphere of hydrogen and argon with a volume ratio of 2:8, heated to 600°C, and reduced at high temperature for 15 minutes, and then cooled by nitrogen to obtain modified nanographene.

[0043] S23. In parts by weight, 51.5 parts of iron, 17.3 parts of chromium, 8.4 parts of nickel, 4.1 parts of cobalt, and 17.2 parts of titanium were placed in a ball mill, ground to the desired particle size and mixed, heated to 2100 ° C for melting, spray granulated, cooled and sieved to obtain an alloy powder with a particle size of 30-50 μm, which was mixed with modified nano-graphene in a mass ratio of 10:0.3, and shaken and blended for 5 min to obtain a corrosion-resistant and wear-resistant metal powder coating;

[0044] S3. Preheat the leather grain embossing roller blank to 300°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5g / min, the laser cladding power is 2.5kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0045] Example 3. A process for processing a leather grain embossing roller, comprising the following steps:

[0046] Compared with Example 1, this embodiment increases the amount of tetrabutyl titanate added in step S22;

[0047] S1. Preparation of leather grain embossing roller;

[0048] The surface of the steel roller blank was polished with sandpaper until the surface roughness was 0.1-0.5 μm, and then the surface was cleaned with anhydrous ethanol and deionized water, dried, and a resin coating was applied to the surface and dried. The resin coating in a predetermined area was ablated by laser, and a leather-like pattern was formed on the surface of the embossing roller blank. The entire roller was immersed in nitric acid with a concentration of 30 wt%, heated to 45° C., and acid-etched for 10 minutes. The roller was taken out, and the remaining coating on the surface was removed with a cleaning agent. The surface was then cleaned again with anhydrous ethanol and acetone for three times to obtain a leather-like embossing roller blank.

[0049] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0050] S21. Disperse 5 parts of nanographene material by weight in 100 parts of deionized water. After ultrasonic dispersion for 1 hour, add 20 parts of KH-550 silane coupling agent. Continue mixing for 3 minutes, then add ammonia water to adjust the pH to 10.5. After heating to 60°C, set the ion beam energy to 5 KeV and the ion beam current density to 2 μA / cm 2 ion irradiation reaction for 2h, adding anhydrous ethanol 3 times the volume of deionized water to mix, centrifugal filtration, and continue to wash the precipitate with anhydrous ethanol 2-3 times to obtain amino-modified graphene;

[0051] S22. 5 parts by weight of amino-modified graphene were dispersed in anhydrous ethanol, ultrasonically dispersed for 1 hour, and then glacial acetic acid was added to adjust the pH to 4.5. Then, 10 parts of tetrabutyl titanate and 30 parts of deionized water were added thereto, and the mixture was stirred for 2 hours. After centrifugation and precipitation, the mixture was vacuum dried to constant weight. The resulting product was placed in a mixed gas atmosphere of hydrogen and argon with a volume ratio of 2:8, heated to 600°C, and reduced at high temperature for 15 minutes, and then cooled by nitrogen to obtain modified nanographene.

[0052] S23. In parts by weight, 51.5 parts of iron, 17.3 parts of chromium, 8.4 parts of nickel, 4.1 parts of cobalt, and 17.2 parts of titanium were placed in a ball mill, ground to the desired particle size and mixed, heated to 2100 ° C for melting, spray granulated, cooled and sieved to obtain an alloy powder with a particle size of 30-50 μm, which was mixed with modified nano-graphene in a mass ratio of 10:0.3, and shaken and blended for 5 min to obtain a corrosion-resistant and wear-resistant metal powder coating;

[0053] S3. Preheat the leather grain embossing roller blank to 300°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5g / min, the laser cladding power is 2.5kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0054] Example 4. A process for processing a leather grain embossing roller, comprising the following steps:

[0055] Compared with Example 1, this embodiment increases the amount of modified nanographene added in step S23;

[0056] S1. Preparation of leather grain embossing roller;

[0057] The surface of the steel roller blank was polished with sandpaper until the surface roughness was 0.1-0.5 μm, and then the surface was cleaned with anhydrous ethanol and deionized water, dried, and a resin coating was applied to the surface and dried. The resin coating in a predetermined area was ablated by laser, and a leather-like pattern was formed on the surface of the embossing roller blank. The entire roller was immersed in nitric acid with a concentration of 30 wt%, heated to 45° C., and acid-etched for 10 minutes. The roller was taken out, and the remaining coating on the surface was removed with a cleaning agent. The surface was then cleaned again with anhydrous ethanol and acetone for three times to obtain a leather-like embossing roller blank.

[0058] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0059] S21. Disperse 5 parts of nanographene material by weight in 100 parts of deionized water. After ultrasonic dispersion for 1 hour, add 20 parts of KH-550 silane coupling agent. Continue mixing for 3 minutes, then add ammonia water to adjust the pH to 10.5. After heating to 60°C, set the ion beam energy to 5 KeV and the ion beam current density to 2 μA / cm 2 ion irradiation reaction for 2h, adding anhydrous ethanol 3 times the volume of deionized water to mix, centrifugal filtration, and continue to wash the precipitate with anhydrous ethanol 2-3 times to obtain amino-modified graphene;

[0060] S22. 5 parts by weight of amino-modified graphene were dispersed in anhydrous ethanol, ultrasonically dispersed for 1 hour, and then glacial acetic acid was added to adjust the pH to 4.5. 2 parts of tetrabutyl titanate and 30 parts of deionized water were added thereto, and the mixture was stirred for 2 hours. After centrifugation and precipitation, the mixture was vacuum dried to constant weight. The resulting product was placed in a mixed gas atmosphere of hydrogen and argon with a volume ratio of 2:8, heated to 600°C, and reduced at high temperature for 15 minutes, and then cooled by nitrogen to obtain modified nanographene.

[0061] S23. In parts by weight, 51.5 parts of iron, 17.3 parts of chromium, 8.4 parts of nickel, 4.1 parts of cobalt, and 17.2 parts of titanium were placed in a ball mill, ground to the desired particle size and mixed, heated to 2100 ° C and melted, spray granulated, cooled and sieved to obtain an alloy powder with a particle size of 30-50 μm, which was mixed with modified nano-graphene in a mass ratio of 10:0.8, and shaken and blended for 5 minutes to obtain a corrosion-resistant and wear-resistant metal powder coating;

[0062] S3. Preheat the leather grain embossing roller blank to 300°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5g / min, the laser cladding power is 2.5kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0063] Example 5. A process for processing a leather grain embossing roller, comprising the following steps:

[0064] Compared with Example 1, this embodiment increases the powder feeding amount during laser cladding in step S3;

[0065] S1. Preparation of leather grain embossing roller;

[0066] The surface of the steel roller blank was polished with sandpaper until the surface roughness was 0.1-0.5 μm, and then the surface was cleaned with anhydrous ethanol and deionized water, dried, and a resin coating was applied to the surface and dried. The resin coating in a predetermined area was ablated by laser, and a leather-like pattern was formed on the surface of the embossing roller blank. The entire roller was immersed in nitric acid with a concentration of 30 wt%, heated to 45° C., and acid-etched for 10 minutes. The roller was taken out, and the remaining coating on the surface was removed with a cleaning agent. The surface was then cleaned again with anhydrous ethanol and acetone for three times to obtain a leather-like embossing roller blank.

[0067] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0068] S21. Disperse 5 parts of nanographene material by weight in 100 parts of deionized water. After ultrasonic dispersion for 1 hour, add 20 parts of KH-550 silane coupling agent. Continue mixing for 3 minutes, then add ammonia water to adjust the pH to 10.5. After heating to 60°C, set the ion beam energy to 5 KeV and the ion beam current density to 2 μA / cm 2 ion irradiation reaction for 2h, adding anhydrous ethanol 3 times the volume of deionized water to mix, centrifugal filtration, and continue to wash the precipitate with anhydrous ethanol 2-3 times to obtain amino-modified graphene;

[0069] S22. 5 parts by weight of amino-modified graphene were dispersed in anhydrous ethanol, ultrasonically dispersed for 1 hour, and then glacial acetic acid was added to adjust the pH to 4.5. 2 parts of tetrabutyl titanate and 30 parts of deionized water were added thereto, and the mixture was stirred for 2 hours. After centrifugation and precipitation, the mixture was vacuum dried to constant weight. The resulting product was placed in a mixed gas atmosphere of hydrogen and argon with a volume ratio of 2:8, heated to 600°C, and reduced at high temperature for 15 minutes, and then cooled by nitrogen to obtain modified nanographene.

[0070] S23. In parts by weight, 51.5 parts of iron, 17.3 parts of chromium, 8.4 parts of nickel, 4.1 parts of cobalt, and 17.2 parts of titanium were placed in a ball mill, ground to the desired particle size and mixed, heated to 2100 ° C for melting, spray granulated, cooled and sieved to obtain an alloy powder with a particle size of 30-50 μm, which was mixed with modified nano-graphene in a mass ratio of 10:0.3, and shaken and blended for 5 min to obtain a corrosion-resistant and wear-resistant metal powder coating;

[0071] S3. Preheat the leather grain embossing roller blank to 300°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 10g / min, the laser cladding power is 2.5kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0072] Comparative Example 1. A processing technology for a leather grain embossing roller, comprising the following steps:

[0073] Compared with Example 1, this comparative example did not prepare modified nanographene;

[0074] S1. Preparation of leather grain embossing roller;

[0075] The surface of the steel roller blank was polished with sandpaper until the surface roughness was 0.1-0.5 μm, and then the surface was cleaned with anhydrous ethanol and deionized water, dried, and a resin coating was applied to the surface and dried. The resin coating in a predetermined area was ablated by laser, and a leather-like pattern was formed on the surface of the embossing roller blank. The entire roller was immersed in nitric acid with a concentration of 30 wt%, heated to 45° C., and acid-etched for 10 minutes. The roller was taken out, and the remaining coating on the surface was removed with a cleaning agent. The surface was then cleaned again with anhydrous ethanol and acetone for three times to obtain a leather-like embossing roller blank.

[0076] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0077] S23. In parts by weight, 51.5 parts of iron, 17.3 parts of chromium, 8.4 parts of nickel, 4.1 parts of cobalt, and 17.2 parts of titanium were placed in a ball mill, ground to the desired particle size, mixed, heated to 2100 ° C and melted, spray granulated, cooled, and sieved to obtain a particle size of 30-50 μm anti-corrosion and wear-resistant metal powder coating;

[0078] S3. Preheat the leather grain embossing roller blank to 300°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5g / min, the laser cladding power is 2.5kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0079] Comparative Example 2. A processing technology for a leather grain embossing roller, comprising the following steps:

[0080] Compared with Example 1, hydrogen reduction was not used in step S22 of this comparative example;

[0081] S1. Preparation of leather grain embossing roller;

[0082] The surface of the steel roller blank was polished with sandpaper until the surface roughness was 0.1-0.5 μm, and then the surface was cleaned with anhydrous ethanol and deionized water, dried, and a resin coating was applied to the surface and dried. The resin coating in a predetermined area was ablated by laser, and a leather-like pattern was formed on the surface of the embossing roller blank. The entire roller was immersed in nitric acid with a concentration of 30 wt%, heated to 45° C., and acid-etched for 10 minutes. The roller was taken out, and the remaining coating on the surface was removed with a cleaning agent. The surface was then cleaned again with anhydrous ethanol and acetone for three times to obtain a leather-like embossing roller blank.

[0083] S2. Preparation of anti-corrosion and wear-resistant metal powder coating;

[0084] S21. Disperse 5 parts of nanographene material by weight in 100 parts of deionized water. After ultrasonic dispersion for 1 hour, add 20 parts of KH-550 silane coupling agent. Continue mixing for 3 minutes, then add ammonia water to adjust the pH to 10.5. After heating to 60°C, set the ion beam energy to 5 KeV and the ion beam current density to 2 μA / cm 2 ion irradiation reaction for 2h, adding anhydrous ethanol 3 times the volume of deionized water to mix, centrifugal filtration, and continue to wash the precipitate with anhydrous ethanol 2-3 times to obtain amino-modified graphene;

[0085] S22. 5 parts by weight of amino-modified graphene were dispersed in anhydrous ethanol, ultrasonically dispersed for 1 hour, glacial acetic acid was added, and the pH value was adjusted to 4.5. Then, 2 parts of tetrabutyl titanate and 30 parts of deionized water were added thereto, and the reaction was stirred for 2 hours. After centrifugation and precipitation, the mixture was vacuum dried to constant weight to obtain modified nanographene;

[0086] S23. In parts by weight, 51.5 parts of iron, 17.3 parts of chromium, 8.4 parts of nickel, 4.1 parts of cobalt, and 17.2 parts of titanium were placed in a ball mill, ground to the desired particle size and mixed, heated to 2100 ° C for melting, spray granulated, cooled and sieved to obtain an alloy powder with a particle size of 30-50 μm, which was mixed with modified nano-graphene in a mass ratio of 10:0.3, and shaken and blended for 5 min to obtain a corrosion-resistant and wear-resistant metal powder coating;

[0087] S3. Preheat the leather grain embossing roller blank to 300°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5g / min, the laser cladding power is 2.5kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

[0088] Detection:

[0089] Steel of the same material as the leather grain embossing roll blank was used as a blank, and anti-corrosion and wear-resistant metal powder coatings were prepared according to the methods of Examples 1-5 and Comparative Examples 1-2, and then clad as test samples;

[0090] The wear resistance of the test samples prepared in Examples 1-5 and Comparative Examples 1-2 was tested using a UMT-3 friction and wear tester. During the test, a 4 mm GCr15 ball was used to apply a normal load of 5 N to the sample, and dry friction sliding was performed for 20 minutes at a rotation speed of 300 rpm.

[0091] The hardness of the test samples prepared in Examples 1-5 and Comparative Examples 1-2 was tested using a Vickers microhardness tester;

[0092] According to GB / T 17897-1999, pitting weight loss test was performed on the test samples prepared in Examples 1-5 and Comparative Examples 1-2;

[0093] The test results are shown in the table below;

[0094]

[0095] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A processing technology for a leather grain embossing roller, characterized in that: The following steps are involved: S1. Preparation of leather grain embossing roller; The surface of the steel roller blank is polished with sandpaper. After polishing, the surface is cleaned with anhydrous ethanol and deionized water, dried, and a resin coating is applied to the surface and dried. The resin coating in a predetermined area is ablated with a laser to form an ablation pattern on the surface of the embossing roller blank. The entire roller is immersed in nitric acid, heated to 45-60° C., and acid-etched for 5-25 minutes. The roller is then taken out and the remaining coating on the surface is removed with a cleaning agent. The surface is then cleaned again with anhydrous ethanol and acetone for 2-5 times to obtain a leather-grained embossing roller blank. S2. Preparation of anti-corrosion and wear-resistant metal powder coating; S21. The nanographene material was dispersed in deionized water and dispersed by ultrasonic vibration for 1-2 hours. Then, a KH-550 silane coupling agent was added thereto. After mixing for 3-5 minutes, ammonia was added dropwise to adjust the pH value to 10-11. After heating to 55-65°C, ion irradiation was carried out for 2-4 hours. After adding anhydrous ethanol 3-5 times the volume of deionized water and mixing, the mixture was centrifuged and filtered. After washing the precipitate with anhydrous ethanol for 2-3 times, amino-modified graphene was obtained. S22. The amino-modified graphene was dispersed in anhydrous ethanol and ultrasonically dispersed for 1-2 hours. Glacial acetic acid was added to adjust the pH to 4-5. Tetrabutyl titanate and deionized water were then added and stirred for 2-4 hours. The precipitate was separated by centrifugation and vacuum dried to a constant weight. The resulting product was placed in a hydrogen and argon atmosphere, heated to 600-650°C, and reduced at high temperature for 15-30 minutes. The product was then cooled by nitrogen to obtain modified nanographene. S23. Iron, chromium, nickel, cobalt, and titanium were placed in a ball mill, ground to the desired particle size, and then mixed. After heating to 2100-2300 ° C, the mixture was melted, spray granulated, cooled, and sieved to obtain an alloy powder with a particle size of 30-50 μm. The alloy powder was mixed with modified nanographene and shaken for 5-15 minutes to obtain a corrosion-resistant and wear-resistant metal powder coating. S3. Preheat the leather grain embossing roller blank to 300-350°C, and laser-clad its surface with anti-corrosion and wear-resistant metal powder coating. During laser cladding, the powder feeding rate is 5-10g / min, the laser cladding power is 2.5-3kw, and the laser scanning speed is 3-8mm / s. After the laser cladding is completed, a leather grain embossing roller is obtained.

2. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S1, after being polished with sandpaper, the surface roughness of the steel roller blank is 0.1-0.5 μm.

3. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S1, the ablation pattern is dermatoglyphics.

4. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S21, the mass ratio of the nano-graphene, deionized water and kH-550 silane coupling agent is (0.05-0.1):1:(0.2-0.8).

5. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S21, during the ion irradiation reaction, the ion beam energy is 5-10 KeV, and the ion beam current density is 2-4 μA / cm 2 .

6. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S22, the mass ratio of the amino-modified graphene to tetrabutyl titanate and deionized water is 5:(2-10):(30-50).

7. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S22, the volume ratio of hydrogen to argon in the hydrogen and argon atmosphere is (1-3): (7-9).

8. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S23, the alloy powder consists of 45-55 parts of iron, 15-20 parts of chromium, 5-10 parts of nickel, 3-5 parts of cobalt, and 10-20 parts of titanium, in parts by weight.

9. The processing technology of a leather grain embossing roller according to claim 1, characterized in that: In step S23, the mass ratio of the alloy powder to the modified nano-graphene is 10:(0.3-0.8).

10. A leather grain embossing roller prepared by the processing method according to any one of claims 1 to 9.

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