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CN-122006997-A - Improved coating machine composite photo-curing process based on slurry pretreatment

CN122006997ACN 122006997 ACN122006997 ACN 122006997ACN-122006997-A

Abstract

The invention discloses an improved coating machine composite photo-curing process based on slurry pretreatment, which comprises the following steps of comprehensively preparing a slurry in the early stage of construction, carrying out multistage deep pretreatment on the slurry, carrying out accurate pretreatment on the coating machine, carrying out layered accurate coating operation, carrying out multistage combined photo-curing sectional treatment, carrying out dynamic detection and adjustment in the process, carrying out post-treatment and finished product shaping, carrying out environmental protection and safety guarantee measures, wherein the slurry pretreatment link adopts multistage filtration and vacuum defoamation combination and is matched with pre-crosslinking modification, the defects of coating bubbles, pinholes, particle impurities and the like are eliminated from the source, the dispersibility and the stability of the slurry are improved, the accurate pretreatment of the coating machine is combined with a layered differential coating mode, the problems of sagging, missing coating and the like are avoided, and the coating flatness is improved.

Inventors

  • CHEN JUN
  • XU PENG
  • TANG WEI

Assignees

  • 东莞市同盟机械有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. The improved coating machine composite photo-curing process based on slurry pretreatment is characterized by comprising the following steps of: Step one, comprehensively preparing the base material in the early stage of construction, namely detecting the appearance and the performance of the base material, comprehensively checking a coating machine and photo-curing equipment, preparing the matched slurry, auxiliary materials and detection tools, and regulating and controlling construction environment parameters; step two, multistage deep pretreatment of slurry, namely sequentially carrying out primary filtration, secondary fine filtration, vacuum defoaming, temperature adaptation adjustment and pre-crosslinking modification treatment, and optimizing the dispersibility, fluidity and stability of the slurry; Step three, accurate pretreatment of the coating machine, which is to clean key components of the coating machine, calibrate coating clearance, transmission speed and pressure parameters and debug the stability of a feeding system; Sequentially performing primary coating, middle coating and surface coating by adopting a differential coating mode, performing primary drying treatment after each layer of coating, and controlling the coating thickness and the surface flatness of each layer of coating; Step five, compound photocuring sectional treatment, namely pre-curing to remove residual solvent, main curing to achieve complete crosslinking of the coating, and post-curing to stabilize the coating performance, wherein three-section curing adopts multi-band UV lamp combined irradiation; step six, dynamically detecting and adjusting the process, namely detecting the thickness and the flatness after each layer is coated, detecting the curing degree and the adhesive force after each section is cured, and adjusting the coating parameters and the curing parameters in real time according to the detection result; Step seven, post-treatment and finished product shaping, namely gradient cooling is carried out on the solidified coating, redundant coating at the edge is trimmed, and film covering protection or surface polishing treatment is carried out according to requirements; And step eight, environmental protection and safety guarantee measures, namely collecting waste gas and waste liquid in the construction process, treating the waste gas and the waste liquid, controlling the running noise of equipment, wearing special protective equipment by operators, and realizing the safety operation standard of the equipment.
  2. 2. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the first step is as follows: selecting a substrate to be coated, checking surface defects of the substrate, and detecting surface tension, water absorption and tensile strength parameters of the substrate to ensure that the substrate meets coating requirements; Checking equipment, namely checking the running conditions of a transmission system, a feeding system and a temperature control system of the coating machine, confirming that a UV lamp of the light curing equipment is normally lightened and the power regulating function is effective, and detecting the grounding and insulating properties of each equipment; preparing auxiliary materials, namely preparing auxiliary materials matched with the base materials, ensuring that the auxiliary materials do not deteriorate in the effective period; And (3) environment regulation, namely controlling the construction environment temperature to be 20-28 ℃ and the relative humidity to be 40% -60%, and arranging an environment dustproof device to ensure that the particle size of suspended particles in the air is less than or equal to 10 mu m and prevent dust from polluting a coating.
  3. 3. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the second step is specifically as follows: Primary filtering, namely introducing the original slurry into filtering equipment provided with a stainless steel filter screen with 100-150 meshes, controlling the filtering pressure to be 0.3-0.5MPa, and back flushing the filter screen every 30min in the filtering process to remove solid impurities and aggregates with the particle size of more than 100 mu m in the slurry; secondary fine filtering treatment, namely introducing the slurry after primary filtering into a 500-800 mesh ceramic filter element filtering device, wherein the filtering pressure is 0.1-0.2MPa, and intercepting tiny particles with the particle size of more than 20 mu m, wherein the ceramic filter element is replaced every 2 hours, so that impurity accumulation is avoided; Vacuum defoaming treatment, namely injecting the slurry after secondary fine filtration into a vacuum defoaming tank, closing a tank door, vacuumizing to a vacuum degree of-0.08 to-0.095 MPa, keeping the defoaming time for 30-60min, and slowly stirring at a speed of 20-30r/min in the defoaming process, wherein the stirring direction is along the tangential direction of the tank wall, so that new bubbles are prevented from being generated; The temperature adaptation and adjustment, namely adjusting the temperature of the slurry to 25-35 ℃ through a jacket type temperature control system of the deaerating tank, controlling the temperature fluctuation to +/-1 ℃, continuously stirring and preserving heat at the speed of 15-20r/min after the adjustment is finished, and preventing the slurry from secondary agglomeration; And (3) pre-crosslinking modification treatment, namely adding a silane coupling agent accounting for 0.5-2% of the total mass of the slurry into the slurry after temperature adaptation, mixing for 20-30min at a stirring speed of 30-40r/min, and performing ultrasonic assisted dispersion in the mixing process, wherein the ultrasonic frequency is 20-40kHz, and the power is 500-800W, so as to realize the primary crosslinking of the molecular chains of the slurry.
  4. 4. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the third step is as follows: Cleaning the components, namely selecting a cleaning mode according to the material of a coating roller, wiping a metal coating roller by using absolute ethyl alcohol, wiping a rubber coating roller by using a special neutral cleaning agent, wiping the rubber coating roller by using dust-free cloth, and drying the rubber coating roller after wiping to ensure that the surface of the coating roller is free of residual impurities and greasy dirt; Parameter calibration, namely adjusting a coating gap through a thickness calibrator to control the gap error to +/-0.01 mm, debugging a transmission system to ensure that the transmission speed of a substrate is stabilized at 5-20m/min and the speed fluctuation is less than or equal to +/-0.2 m/min, adjusting the coating pressure, and controlling the pressure to be 0.1-0.3MPa according to the material and the thickness of the substrate; And (3) debugging a feeding system, namely starting a feeding pump, feeding the pretreated slurry into a trough, adjusting the feeding flow to be 10-50L/h, ensuring that the liquid level of the slurry in the trough is stabilized at 1/2-2/3 of the height of the trough, observing that a feeding pipeline is free from leakage and blockage, and ensuring that the feeding is uniform and continuous.
  5. 5. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the fourth step is as follows: The priming coating construction, namely priming coating is carried out in a micro-concave coating mode, the mesh depth of an anilox roller is selected to be 30-50 mu m, the substrate conveying speed is 5-10m/min, the thickness of the priming coating after coating is controlled to be 5-15 mu m, after the priming coating is finished, the priming coating is sent into a hot air drying box for preliminary drying, the drying temperature is 40-60 ℃, the drying time is 1-3min, and 30-50% of solvent in the sizing agent is removed; the middle coating construction, namely, after the bottom coating is dried, middle coating is carried out by adopting a comma scraper coating mode, the included angle between the scraper and the substrate is controlled to be 30-45 degrees, the coating pressure is controlled to be 0.15-0.25MPa, the middle coating thickness is controlled to be 20-50 mu m, secondary drying is carried out after the middle coating, the drying temperature is 50-70 ℃, the drying time is 2-4min, and the solvent removal proportion reaches 60% -80%; The surface coating construction comprises the steps of performing surface coating in a slit coating mode after the surface coating is dried, adjusting the slit width to be 0.1-0.3mm, controlling the feeding flow to be in linkage with the substrate conveying speed, controlling the thickness of the surface coating to be 10-30 mu m, performing three times of drying after the surface coating, wherein the drying temperature is 45-65 ℃, the drying time is 1-2min, and controlling the content of residual solvent to be below 5%; After each layer of coating, 5-8 detection points are uniformly selected in the width direction of the substrate by using a coating thickness gauge, the thickness is measured and recorded, and the flatness of the surface is detected by using a flatness detector, so that the coating is ensured to have no sagging, no missing coating and no obvious scratch.
  6. 6. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the fifth step is specifically as follows: The pre-curing treatment, namely, the base material after three times of drying is sent into a pre-curing furnace, 2-3 low-power UV lamps are arranged in the pre-curing furnace, the wavelength of the UV lamps is 365nm, the power of a single lamp is 80-120W/cm, the distance between the lamps and the surface of the base material is 15-20cm, the transmission speed of the base material is kept consistent with the construction of the surface coating, the pre-curing time is 5-10s, the surface of the coating is primarily cured, and the residual solvent is removed; the primary curing treatment, namely, the pre-cured base material enters a primary curing furnace, 4-6 medium-high intensity UV lamps are arranged in the primary curing furnace, 254nm and 365nm dual-band combination is adopted, the power of a single lamp is 150-250W/cm, the distance between the lamp and the surface of the base material is 10-15cm, the transmission speed is adjusted to 3-8m/min, the primary curing time is 15-30s, and the complete crosslinking of a coating molecular chain is realized; The post-curing treatment, namely, the base material after main curing enters a post-curing furnace, 2-3 low-intensity UV lamps are arranged in the post-curing furnace, the wavelength is 365nm, the power of a single lamp is 50-100W/cm, the distance between the lamps and the surface of the base material is 20-25cm, the transmission speed is 8-12m/min, the post-curing time is 8-15s, the internal stress of the coating is eliminated, and the coating performance is stabilized; In the three-stage curing process, nitrogen is introduced into the curing furnace through an inert gas protection device, the oxygen content in the furnace is controlled to be less than or equal to 5 percent, the oxidation and yellowing of the coating are avoided, the temperature in the curing furnace is monitored in real time, the temperature is ensured not to exceed 80 ℃, and the deformation of the base material is prevented.
  7. 7. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the step six is specifically as follows: Coating detection and adjustment, namely measuring thickness by a coating thickness gauge after each layer of coating, and adjusting coating gap or feeding flow if thickness deviation exceeds +/-0.5 mu m; Detecting and adjusting the curing degree of the coating by using a curing degree detector after pre-curing, and if the curing degree is lower than 60%, improving the power of a pre-curing UV lamp or reducing the transmission speed, after main curing, performing a cross-hatch test by using an adhesive force tester, and if the adhesive force grade is lower than 2, adjusting the power of the main curing UV lamp, the wavelength combination or the curing time; And detecting environment and slurry, namely detecting the construction environment temperature, humidity and dust content once per hour, starting an environment regulation and control system to regulate if the construction environment temperature, humidity and dust content exceed a set range, detecting the viscosity and dispersibility of the pretreated slurry once per 2 hours, and re-defoaming and stirring if the viscosity change exceeds +/-5 mPa, s or agglomeration occurs.
  8. 8. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the step seven is specifically as follows: The final product after the post-solidification is sent into a cooling channel, the cooling channel is divided into three sections, the cooling temperature of the first section is 50-60 ℃, the second section is 30-40 ℃, the third section is 20-25 ℃, and the cooling time of each section is 2-3min, so that the cracking of the coating caused by quenching is avoided; Trimming, namely trimming redundant coating on the edge of the base material by adopting an automatic trimming machine, wherein the trimming width is controlled to be 5-10mm, so that the edge of a finished product is tidy and has no burr; Setting, namely selecting to carry out film covering protection or surface polishing according to the product requirement, wherein the film covering adopts a transparent PET protective film, the film covering pressure is 0.05-0.1MPa, the film and the coating are bonded without bubbles, the surface polishing adopts a non-woven fabric polishing wheel, the polishing speed is 10-15m/min, the polishing times are 1-2 times, and the glossiness of the coating is improved; And (3) detecting finished products after shaping, wherein the detection items comprise coating thickness, flatness, adhesive force, glossiness, scratch resistance and yellowing resistance, and all detection results meet the design requirements and can be put in storage.
  9. 9. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the environmental protection measures in the step eight are as follows: Waste gas treatment, namely, installing an active carbon adsorption device and UV photolysis purification equipment at waste gas discharge ports of a coating machine, a drying box and a curing furnace, wherein the waste gas reaches the national discharge standard after being treated and is discharged; Waste liquid treatment, namely collecting cleaning waste liquid and slurry residues generated in the construction process, storing the cleaning waste liquid and slurry residues in a special sealed container in a classified manner, and entrusting a professional environment-friendly institution to carry out harmless treatment; dust and noise control, namely arranging dust covers at a feed inlet and a discharge outlet of the coating machine, and cleaning dust in an operation area periodically; And (3) recycling resources, namely sealing, refrigerating and preserving unused pretreated slurry, and recycling the pretreated slurry in a priority manner within the effective period, and classifying and recycling the leftover materials of the base material to realize recycling of resources.
  10. 10. The improved coating machine composite photo-curing process based on slurry pretreatment as claimed in claim 1, wherein the safety measures in the step eight are as follows: Personnel protection, namely, operators must wear anti-ultraviolet protective clothing, protective glasses, anti-poison masks and solvent-resistant gloves to avoid the damage of UV radiation and chemical substances; the equipment is safe, wherein the UV light curing equipment is provided with an interlocking protection device, and the power supply of a UV lamp is automatically cut off when an equipment door is opened; The electric safety is realized by the steps of well grounding all electric equipment, periodically checking the insulation performance of a line, avoiding short circuit and electric leakage, preparing a fire disaster and chemical leakage emergency plan by the construction area provided with a dry powder fire extinguisher and emergency lighting equipment; Operation standard, namely training all operators before the post, familiarizing with technological process, equipment operation method and safety notice, checking to be qualified and then going on post, strictly forbidden to smoke and open fire operation in a construction area, and strictly forbidden to operate equipment illegally.

Description

Improved coating machine composite photo-curing process based on slurry pretreatment Technical Field The invention relates to the technical field of composite photo-curing processes, in particular to an improved coater composite photo-curing process based on slurry pretreatment. Background In the field of coating photo-curing processes, the quality of the coating directly determines the properties and the service life of the end product. In the traditional process, the slurry is only subjected to simple stirring or single filtering treatment before use, so that the problems that agglomerated particles and tiny impurities which are not dispersed uniformly in the slurry are not thoroughly removed, so that pinholes, pits, scratches and the like are formed in a coating after coating, residual air bubbles in the slurry cannot be timely discharged in the coating process, air holes are formed after solidification, the compactness and mechanical property of the coating are reduced, physical and chemical indexes such as slurry temperature and viscosity are not accurately adapted and are not matched with the running parameters of a coating machine, the thickness of the coating is uneven, sagging or discontinuous coating is caused, the traditional photocuring mostly adopts single-band and single-intensity UV irradiation, internal stress is easily generated on the surface of the coating in the curing process, the coating is easy to crack and fall off, compatibility among different coatings is poor, interlayer binding force is insufficient, the coating machine is not subjected to targeted pretreatment before construction, the residual impurities, coating clearance deviation and the like directly influence the coating precision, and meanwhile the process lacks a dynamic adjustment mechanism, and the fluctuation of the slurry performance and environmental parameters in the construction process cannot be timely dealt with. Disclosure of Invention The invention aims to provide an improved coating machine composite photo-curing process based on slurry pretreatment, which solves the problems in the prior art. In order to achieve the aim, the invention provides the following technical scheme that the improved coating machine composite photo-curing process based on slurry pretreatment comprises the following steps: Step one, comprehensively preparing the base material in the early stage of construction, namely detecting the appearance and the performance of the base material, comprehensively checking a coating machine and photo-curing equipment, preparing the matched slurry, auxiliary materials and detection tools, and regulating and controlling construction environment parameters; step two, multistage deep pretreatment of slurry, namely sequentially carrying out primary filtration, secondary fine filtration, vacuum defoaming, temperature adaptation adjustment and pre-crosslinking modification treatment, and optimizing the dispersibility, fluidity and stability of the slurry; Step three, accurate pretreatment of the coating machine, which is to clean key components of the coating machine, calibrate coating clearance, transmission speed and pressure parameters and debug the stability of a feeding system; Sequentially performing primary coating, middle coating and surface coating by adopting a differential coating mode, performing primary drying treatment after each layer of coating, and controlling the coating thickness and the surface flatness of each layer of coating; Step five, compound photocuring sectional treatment, namely pre-curing to remove residual solvent, main curing to achieve complete crosslinking of the coating, and post-curing to stabilize the coating performance, wherein three-section curing adopts multi-band UV lamp combined irradiation; step six, dynamically detecting and adjusting the process, namely detecting the thickness and the flatness after each layer is coated, detecting the curing degree and the adhesive force after each section is cured, and adjusting the coating parameters and the curing parameters in real time according to the detection result; Step seven, post-treatment and finished product shaping, namely gradient cooling is carried out on the solidified coating, redundant coating at the edge is trimmed, and film covering protection or surface polishing treatment is carried out according to requirements; And step eight, environmental protection and safety guarantee measures, namely collecting waste gas and waste liquid in the construction process, treating the waste gas and the waste liquid, controlling the running noise of equipment, wearing special protective equipment by operators, and realizing the safety operation standard of the equipment. Further, the first step specifically comprises: selecting a substrate to be coated, checking surface defects of the substrate, and detecting surface tension, water absorption and tensile strength parameters of the substrate to ensure that the substrate me