A control method for dyeing electronic products

Abstract

The present invention provides a control method for dyeing electronic products, including a dyeing device in which a plurality of function slots connected in sequence are arranged, and in accordance with the process sequence, the function slot arranged at the last position is connected to a pH value detector and a particle analyzer, and the pH value detector and the particle analyzer are electrically connected by a PLC controller, and the PLC controller is electrically connected to a display panel. The present invention ensures that the pH value in the dyeing process is always stable within the working range through the combined action of the pH value and the sealing agent, and also ensures that the particle size of the dye is suitable for standard dyeing, ensures the stability of the dyeing process, reduces the color difference, improves the dyeing process effect, and improves the production yield. By real-time monitoring of the dye concentration, pH value, and dye aggregation state in the dyeing tank, the supply of dyes and additives can be automatically adjusted to ensure the chemical balance of the dyeing process. The dyeing efficiency is improved, the dye waste is reduced, and the need for frequent replacement of the dyeing tank is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of dyeing technology and relates to dye monitoring, in particular to a control method for dyeing of electronic products. Background Art

[0002] With the advancement of technology and changes in consumer preferences, the market demand for 3C products is becoming increasingly diversified. A beautiful and personalized appearance can enhance consumers' willingness to buy and use experience, thereby improving consumer satisfaction and loyalty. Through dyeing, 3C products can be given a colorful appearance, satisfying consumers' pursuit of beauty and making the products more attractive in the market.

[0003] However, the existing 3C product dyeing process faces technical bottlenecks, especially in dye tank management. Due to the differences in the pore size of the oxide film on the large and small surfaces of the material during the dyeing process, when the dye bath usage time increases, the dye aggregates in the tank, the particle size increases, and the dye concentration gradually decreases.

[0004] This directly leads to a series of problems in the dyeing process: 1. Extended dyeing time: As the concentration of the dye gradually decreases over time, the dyeing speed of the dyed material also slows down, resulting in an increase in the overall dyeing time. 2. Uneven coloring rate: Due to the different pore sizes of the oxide film on the front and side, there are differences in the coloring rate. The color on the side is darker and the color on the front is lighter, resulting in obvious color difference. 3. Difficulty in dye tank management: Since the state of the dye tank is difficult to monitor and adjust in real time, the dyeing technician cannot effectively control the chemical balance of the dye tank, and the dyeing stability is difficult to guarantee. These problems directly affect the uniformity and quality of the dyeing effect, resulting in an increase in unqualified products, increased material waste and production costs. In addition, frequent dye tank replacement and dye replenishment aggravate resource consumption and increase the risk of environmental pollution.

[0005] For example, Chinese patent document 202410668199.9 discloses an alloy anodizing solution and anodizing coloring process. It includes the following steps: step 1, accurately weighing and mixing various components; step 2, adjusting the pH value; step 3, mixing and stirring various components; step 4, cleaning the metal surface; step 5, soaking the metal sample in the alloy anodizing solution; step 6, removing the solution residue; step 7, drying; step 8, sealing. By making potassium hydroxide 20-70 g / L, aluminum nitrate 5-15 g / L, potassium dihydrogen phosphate 5-20 g / L, benzoic acid 0.2-10 g / L, EDTA 4-10 g / L, potassium carbonate 8-20 g / L, sodium fluoride 1-10 g / L, sodium hydroxide 70-90 g / L to make an alloy anodizing solution and then carry out anodizing coloring process, the hardness of the metal surface can be increased by anodizing treatment, and its wear resistance and anti-scratch performance can be improved.

[0006] Although the above technical solution discloses the regulation of pH value in the dyeing process, it does not solve the problem of poor dyeing caused by increased particle size, reduced concentration, reduced potential, etc. Summary of the invention

[0007] The purpose of the present invention is to solve the above problems in the prior art and to provide a control method for dyeing electronic products.

[0008] The purpose of the present invention can be achieved by the following technical solutions: a control method for dyeing electronic products, wherein a plurality of function slots connected in sequence are arranged in the dyeing equipment, and according to the process sequence, the function slot arranged at the end is connected to a pH value detector and a particle analyzer, wherein the particle analyzer is specifically a dual-channel particle analyzer. The pH value detector and the particle analyzer are electrically connected by a PLC controller, and the PLC controller is electrically connected to a display panel; the control method for dyeing electronic products includes the following contents: S1. Set the pH standard range, particle size standard range, concentration standard range and zeta potential standard range of the newly created bath dye; set the particle size limit and pH limit of the bath dye at the end of the bath; New bath period: refers to the new dyeing solution established in the anodized aluminum dyeing experiment, which is used for the dyeing production process that has just started.

[0009] End of tank: refers to the state in anodized aluminum dyeing, after a stage of dyeing process, the coloring ability of the dye can no longer meet the quality assessment requirements. In this process, it usually refers to the dyeing process after completing about 28-35 strokes.

[0010] For the same color, the ratio is fixed. Changing the ratio will affect the particle size, that is, the standard range value of the particle size and the standard range value of the concentration are set according to different colors.

[0011] S2. When the flying target material reaches the last functional slot, the PLC controller sends out a detection signal, and detects the actual pH value of the dye through the pH value detector, the actual particle size and actual concentration of the dye through the particle analyzer, the actual conductivity of the dye through the digital conductivity meter, and the actual zeta potential of the dye through the Zeta potential meter; S3. When the actual particle size exceeds the standard range of the particle size of the newly built bath dye, dye is added to the dyeing equipment until the actual particle size meets the standard range; when the actual concentration is lower than the standard range of the concentration of the newly built bath dye, dye is added to the dyeing equipment until the actual concentration meets the standard range; S4. When the actual pH value exceeds the pH standard range of the newly-built bath dye, pH reagent is added to the dyeing equipment to restore the actual pH value to the pH standard range of the newly-built bath dye; S5. When the actual zeta potential exceeds the standard range of the zeta potential of the newly-built bath dye, add a sealing agent (auxiliary agent E-110) to the dyeing equipment to restore the actual zeta potential to the standard range of the zeta potential of the newly-built bath dye; S6. When the actual particle size exceeds the particle size limit, or the actual pH value exceeds the pH limit, it indicates that the dyeing has entered the final stage and the dye in the dyeing equipment should be replaced.

[0012] After entering the late tank stage, quantitative addition of auxiliary agents can no longer stabilize the pH value. The trend at the end of the tank gradually increases, and the addition of auxiliary agents shows a failure mode.

[0013] In the above-mentioned control method for dyeing electronic products, in step S1, the standard range of particle size of the newly-created bath material is 450-550nm, and the Zeta potential is -21--31mV; the standard range of particle size of the material at the end of the tank is slightly increased, and the absolute value of the Zeta potential is decreased.

[0014] The particle size and absolute value of potential of compound dyes are larger than those of single-component dyes. It should be that the interaction between different dyes enhances the dispersion stability of the dye solution.

[0015] In the above-mentioned control method for dyeing of electronic products, in step S1, the pH standard range is 5.65-5.70. When the pH value is stabilized within the controllable range of 5.65-5.70, it will not have much impact on dyeing.

[0016] In the above-mentioned control method for dyeing electronic products, the absorption of the dye solution from the new bath stage to the end of the bath stage is 300-620 nm; with 488 nm excitation light, confocal imaging observed that the dye size was 1 μm.

[0017] The absorption spectrum of the dye solution does not change much from the new bath to the end of the bath, and the actual dye size is about 1 μm.

[0018] In the above-mentioned control method for dyeing electronic products, in step S2, the particle analyzer is based on the electric induction technology. By setting positive and negative electrodes on both sides of the chip hole in the electrolyte solution, when the nanoparticles pass through the small holes of the chip one by one, each particle will displace an equal volume of conductive solution, resulting in an instantaneous increase in the resistance of the electric induction area, generating a potential pulse; the amplitude of the potential pulse is proportional to the particle size of the particle, that is, the larger the particle, the higher the pulse amplitude, and the actual particle size value of the dye is obtained by analyzing the amplitude of the potential pulse; the number of potential pulses is proportional to the concentration of the particles, that is, the more particles pass through the small hole, the more pulses are generated, and the actual concentration value of the dye is obtained by analyzing the number of potential pulses. Since the particles pass through the nanopores one by one and are accurately analyzed, single particle detection in the true sense is achieved.

[0019] In the above-mentioned control method for dyeing electronic products, in step S4, the pH agent uses a pH-5 buffer solution. When the amount of pH-5 buffer solution added is not higher than 9% of the amount added during the new bath period, as the amount of pH-5 buffer solution added increases, the difference in the pore size of the oxide film on the large and small surfaces of the material gradually decreases.

[0020] According to the measured data of particle size and zeta potential, pH-5 buffer solution will affect the aggregation state of the dye and cause the dye to re-aggregate. pH-5 reduces the particle size, increases the absolute value of zeta potential, and improves the dispersion stability. However, if the addition amount is higher than 12.5%, the dye aggregates will increase, the surface charge density will decrease, the absolute value of zeta potential will decrease, and the dispersion stability will decrease.

[0021] In the above-mentioned control method for dyeing electronic products, in step S5, the actual addition amount of the sealing agent (auxiliary agent E-110) is within 1% of the newly-built bath period. When the addition amount of the sealing agent (auxiliary agent E-110) is not higher than 3%, the minimum difference in the pore size of the oxide film on the large and small surfaces of the material is 0.46, which is less than 1.31 of the newly-built bath period. After that, the difference increases with the increase in the addition amount of the sealing agent (auxiliary agent E-110).

[0022] Excessive sealing agent (auxiliary agent E-110) will participate in the aggregation of dye micelles, causing the particle size to increase, and the surface charge density of the micelles to decrease, resulting in a smaller Zeta potential and a larger color difference. Therefore, the amount of E-110 added should not be too much.

[0023] In the above-mentioned control method for dyeing electronic products, after step S2, the actual pH value, actual particle size value, actual concentration value, actual conductivity and actual zeta potential are immediately uploaded to the display panel.

[0024] Technicians monitor the status of dyes in the dyeing equipment through real-time detection data displayed on the display panel, and then determine and control whether to add reagents.

[0025] Compared with the prior art, the control method for dyeing electronic products has the following beneficial effects: 1. The present invention mainly ensures that the pH value in the dyeing process is always stable within the working range through the combined effect of pH value and sealing agent (auxiliary agent E-110), and also ensures that the particle size of the dye is suitable for standard dyeing.

[0026] 2. The present invention provides a method for monitoring the state of dyeing dyes to ensure the stability of the dyeing process, reduce color difference, improve the dyeing process effect, and increase the production yield. By real-time monitoring of the dye concentration, pH value, and dye aggregation state in the dye tank, the supply of dyes and additives can be automatically adjusted to ensure the chemical balance of the dye tank during the dyeing process. Not only can it significantly reduce production losses caused by extended dyeing time or color difference problems, but it can also improve dyeing efficiency, reduce dye waste, and reduce the need for frequent replacement of dye tanks, thereby saving costs and reducing environmental pollution. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0028] Embodiment 1

[0029] In the control method of dyeing electronic products, a plurality of function slots connected in sequence are arranged in the dyeing equipment, and the function slot arranged at the end is connected to a pH value detector and a particle analyzer according to the process sequence, wherein the particle analyzer is specifically a dual-channel particle analyzer. The pH value detector and the particle analyzer are electrically connected by a PLC controller, and the PLC controller is electrically connected to a display panel; the control method of dyeing electronic products includes the following contents: S1. Set the pH standard range, particle size standard range, concentration standard range and zeta potential standard range of the newly created bath dye; set the particle size limit and pH limit of the bath dye at the end of the bath; New bath period: refers to the new dyeing solution established in the anodized aluminum dyeing experiment, which is used for the dyeing production process that has just started.

[0030] End of tank: refers to the state in anodized aluminum dyeing, after a stage of dyeing process, the coloring ability of the dye can no longer meet the quality assessment requirements. In this process, it usually refers to the dyeing process after completing about 28-35 strokes.

[0031] The state of the dye tank at different stages and the particle size of a single dye are very different. Detecting the particle size and concentration of dye particles in the dye tank at different stages is very helpful for the stability and yield of the dye tank.

[0032] For the same color, the ratio is fixed. Changing the ratio will affect the particle size, that is, the standard range value of the particle size and the standard range value of the concentration are set according to different colors.

[0033] The standard range of particle size of the newly-made bath material is 450~550nm, and the Zeta potential is -21~-31mV; the standard range of particle size of the late-stage material is slightly increased, and the absolute value of Zeta potential is decreased. The particle size and absolute value of potential of the compound dye are larger than those of the single-component dye, which should be due to the interaction between different dyes, which enhances the dispersion stability of the dye solution.

[0034] The standard pH range is 5.65-5.70. When the pH value is stable within the controllable range of 5.65-5.70, it will not have much impact on dyeing.

[0035] The absorption of the dye solution from the new bath stage to the end of the tank is 300-620 nm; with 488 nm excitation light, confocal imaging observed that the dye size is 1 μm. The absorption spectrum of the dye solution from the new bath stage to the end of the tank does not change much, and the actual dye size is about 1 μm.

[0036] S2. When the flying target material reaches the last functional slot, the PLC controller sends out a detection signal, detects the actual pH value of the dye through the pH value detector, detects the actual particle size and actual concentration of the dye through the particle analyzer, and detects the actual conductivity of the dye through the digital conductivity meter, and monitors whether the data is offset in real time to maintain the stability of the conductivity of the dye tank; the actual zeta potential of the dye is detected by the Zeta potential meter, which plays a role in real-time monitoring and timely replenishment of reagents; The actual pH value, actual particle size value, actual concentration value, actual conductivity and actual zeta potential are instantly uploaded to the display panel. The technician monitors the status of the dye in the dyeing equipment through the real-time detection data displayed on the display panel, and then determines and controls whether to add reagents.

[0037] The particle analyzer is based on inductive technology. By setting positive and negative electrodes on both sides of the chip hole in the electrolyte solution, when the nanoparticles pass through the small holes of the chip one by one, each particle will displace an equal volume of conductive solution, causing the resistance of the inductive area to increase instantly, generating a potential pulse; the amplitude of the potential pulse is proportional to the particle size, that is, the larger the particle, the higher the pulse amplitude, and the actual particle size value of the dye is obtained by analyzing the amplitude of the potential pulse; the number of potential pulses is proportional to the concentration of the particles, that is, the more particles pass through the small hole, the more pulses are generated, and the actual concentration value of the dye is obtained by analyzing the number of potential pulses. Since the particles pass through the nanopores one by one and are accurately analyzed, true single particle detection is achieved.

[0038] S3. When the actual particle size exceeds the standard range of the particle size of the newly built bath dye, dye is added to the dyeing equipment until the actual particle size meets the standard range; when the actual concentration is lower than the standard range of the concentration of the newly built bath dye, dye is added to the dyeing equipment until the actual concentration meets the standard range; S4. When the actual pH value exceeds the pH standard range of the newly-built bath dye, pH reagent is added to the dyeing equipment to restore the actual pH value to the pH standard range of the newly-built bath dye; The pH agent uses pH-5 buffer solution. When the amount of pH-5 buffer solution added is not higher than 9% of the amount added during the new bath period, as the amount of pH-5 buffer solution added increases, the difference in the pore size of the oxide film on the large and small surfaces of the material gradually decreases.

[0039] According to the measured data of particle size and zeta potential, pH-5 buffer solution will affect the aggregation state of the dye and cause the dye to re-aggregate. pH-5 buffer solution will reduce the particle size, increase the absolute value of zeta potential, and improve the dispersion stability; but the addition amount higher than 12.5% ​​will increase the dye aggregates, reduce the surface charge density, decrease the absolute value of zeta potential, and reduce the dispersion stability.

[0040] S5. When the actual zeta potential exceeds the standard range of the zeta potential of the newly-built bath dye, add a sealing agent (auxiliary agent E-110) to the dyeing equipment to restore the actual zeta potential to the standard range of the zeta potential of the newly-built bath dye; The actual amount of sealing agent (additive E-110) added is within 1% of the newly built bath period. When the amount of sealing agent (additive E-110) added is not higher than 3%, the minimum difference in the pore size of the oxide film on the large and small sides of the material is 0.46, which is less than 1.31 in the newly built bath period. After that, the difference increases with the increase in the amount of sealing agent (additive E-110). Excessive sealing agent (additive E-110) will participate in the aggregation of dye micelles, causing the particle size to increase, and the surface charge density of the micelles will decrease, resulting in a decrease in the Zeta potential and a larger color difference. Therefore, the amount of E-110 added should not be too much.

[0041] S6. When the actual particle size exceeds the particle size limit, or the actual pH value exceeds the pH limit, it indicates that the dyeing has entered the end of the tank, and the dye in the dyeing equipment should be replaced. After entering the end of the tank, quantitative addition of auxiliary agents can no longer stabilize the pH value, and the trend of the end of the tank gradually increases, and the addition of auxiliary agents is in failure mode.

[0042] The change in dye behavior during the dyeing process is closely related to the particle distribution, such as whether the dye particles are evenly distributed in the dye solution, or whether they agglomerate. The adhesion efficiency of the dye from the solution to the material surface changes with the process engineering, and the depth or uniformity of the color changes. The main reason is that the physical and chemical properties of the dye particles have changed, including temperature, pH value, and solvent type that affect the stability of the particles, resulting in different aggregation behaviors and driving forces of the dye in the dye solution. This embodiment mainly considers that as the process engineering proceeds, aluminum cations will gradually accumulate in the dye bath, which will lead to insufficient potential driving force in the subsequent dyeing process, affecting the adsorption behavior of the dye particles on the material surface.

[0043] Embodiment 2

[0044] Through research, it was found that metal ions such as aluminum ions can have a serious impact on dyeing, and the use of certain additives during dyeing can regulate or inhibit these effects. The two key reagents, pH-5 buffer solution and sealing agent (auxiliary E-110), were specifically tested and studied. By testing particle size, zeta potential, and conductivity, the effects of these two additives on the dye solution were studied: the sealing agent (auxiliary E-110) can inhibit aluminum cations and stabilize coloring, but E-110 cannot completely restore the dye solution to its initial state. Excessive E-110 will have a negative effect on dyeing. The main function of the pH-5 buffer solution is to adjust the pH value so that the pH value is stable within the controllable range of 5.65-5.70.

[0045] The specific experimental data are shown in Table 1: Dyeing Tank Test Data Sheet

[0046] Table 1 Difference in pore size of oxide film on large and small surfaces of the material: the color difference is within the specification, and the difference in L value between large and small surfaces is stable with no obvious upward trend; after 60 rods, the difference in L value between large and small surfaces is more than 0.9.

[0047] pH value: adding three kinds of auxiliary agents every three strokes had no significant effect on color difference, and it was basically stable at 5.67-5.68; after 60 strokes, quantitative addition of auxiliary agents could no longer stabilize the pH value, and the trend in the final stage gradually increased, and it showed failure mode by adding PH-5.

[0048] Dyeing time and conductivity: As the dyeing time gradually increases (50-60s), the conductivity increases; Particle size and zeta potential: Under the condition of ten-fold dilution, the particle size of the first 60 rods is basically stable at 200-400nm, and the particle size tends to decrease after 60 rods.

[0049] Conclusion: By adding pH-5 in multiple batches to stabilize the pH of the dye solution, the service life of the dye solution was significantly extended from the original 30-40 bars, the 7.3-day data was extended to 60 bars, and the 7.17-day data was extended to 87 bars. It can be verified that pH is a key factor affecting the life of the dye solution.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but will not deviate from the spirit of the present invention or exceed the defined scope. Although the present invention is described and described in detail in the foregoing description, such descriptions and descriptions are considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, changes and modifications may be made by a person of ordinary skill. Specifically, the present invention encompasses additional embodiments having any combination of features from the above-mentioned different embodiments. With respect to the use of the expression "generally" or "substantially", this patent application should be understood to disclose that these features and values ​​are also fully satisfied, i.e., there is no aforementioned characterization as "generally" or "substantially".

Claims

1. A control method for dyeing electronic products, wherein a plurality of function slots connected in sequence are arranged in a dyeing device, and according to the process sequence, the function slot arranged at the end is connected to a pH value detector and a particle analyzer, the pH value detector and the particle analyzer are electrically connected by a PLC controller, and the PLC controller is electrically connected to a display panel; characterized in that: The control method for dyeing electronic products comprises the following contents: S1, setting the pH standard range value, particle size standard range value, concentration standard range value and zeta potential standard range value of the newly created bath dye; Set the particle size limit and pH limit of the dye at the end of the tank; S2. When the flying target material reaches the last functional slot, the PLC controller sends out a detection signal to detect the actual pH value of the dye, detect the actual particle size and actual concentration of the dye through the particle analyzer, detect the actual conductivity of the dye, and detect the actual zeta potential of the dye; S3. When the actual particle size exceeds the standard range of the particle size of the newly built bath dye, dye is added to the dyeing equipment until the actual particle size meets the standard range; when the actual concentration is lower than the standard range of the concentration of the newly built bath dye, dye is added to the dyeing equipment until the actual concentration meets the standard range; S4. When the actual pH value exceeds the pH standard range of the newly-built bath dye, pH reagent is added to the dyeing equipment to restore the actual pH value to the pH standard range of the newly-built bath dye; S5. When the actual zeta potential exceeds the standard range of the zeta potential of the newly-built bath dye, a sealing agent is added to the dyeing device to restore the actual zeta potential to the standard range of the zeta potential of the newly-built bath dye; S6. When the actual particle size exceeds the particle size limit, or the actual pH value exceeds the pH limit, it indicates that the dyeing has entered the final stage and the dye in the dyeing equipment should be replaced.

2. The control method for dyeing electronic products according to claim 1, characterized in that: In step S1, the standard range of particle size of the material in the new bath period is 450 to 550 nm, and the Zeta potential is -21 to -31 mV; the standard range of particle size of the material in the final stage of the tank is slightly increased, and the absolute value of the Zeta potential is decreased.

3. The control method for dyeing electronic products according to claim 1, characterized in that: In step S1, the pH standard range is 5.65-5.

70. When the pH value is stabilized within the controllable range of 5.65-5.70, it will not have much impact on dyeing.

4. The electronic product dyeing control method according to claim 1, characterized in that: The absorption of the dye solution from the new bath stage to the end of the bath stage was between 300 and 620 nm. The dye size was observed to be 1 μm by confocal imaging with 488 nm excitation light.

5. The electronic product dyeing control method according to claim 1, characterized in that: In step S2, the particle analyzer is based on electric induction technology. By setting positive and negative electrodes on both sides of the chip hole in the electrolyte solution, when the nanoparticles pass through the small holes of the chip one by one, each particle will displace an equal volume of conductive solution, causing the resistance of the electric induction area to increase instantly, generating a potential pulse; the amplitude of the potential pulse is proportional to the particle size of the particle, and the actual particle size value of the dye is obtained by analyzing the amplitude of the potential pulse; the number of potential pulses is proportional to the concentration of the particles, and the actual concentration value of the dye is obtained by analyzing the number of potential pulses.

6. The electronic product dyeing control method according to claim 1, characterized in that: In step S4, the pH agent uses a pH-5 buffer solution. When the amount of the pH-5 buffer solution added is not higher than 9% of the amount added during the new bath period, as the amount of the pH-5 buffer solution added increases, the difference in the pore size of the oxide film on the large and small surfaces of the material gradually decreases.

7. The electronic product dyeing control method according to claim 1, characterized in that: In step S5, the actual amount of sealing agent added is within 1% of the new bath period. When the amount of sealing agent added is not higher than 3%, the minimum difference in pore size of the oxide film on the large and small surfaces of the material is 0.46, which is less than 1.31 in the new bath period. After that, the difference increases with the increase in the amount of sealing agent added.

8. The electronic product dyeing control method according to claim 1, characterized in that: After step S2, the actual pH value, actual particle size value, actual concentration value, actual conductivity and actual zeta potential are immediately uploaded to the display panel.

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