Process information laser marking method for assisting assembly of large-size wallboard parts

Abstract

The invention belongs to the technical field of large-size wallboard part assembly marking, and relates to a process information laser marking method for assisting large-size wallboard part assembly. According to the method, thin-layer spraying treatment is carried out by using the coating which can be quickly cured and is easy to peel, so that an effective antifouling effect can be achieved on the premise of not influencing the assembly precision; meanwhile, an automatic laser marking process is combined, various hole positions can be further accurately delimited on the thin coating, the edge boundary can be positioned, more refined assembly operation is achieved under the condition that the appearance and performance of the part are not damaged, the production efficiency and quality are improved, and the production cost is reduced. And a new feasible solution is provided for high-performance-requirement parts facing similar problems in related fields. The problems that in the traditional part assembling and marking process, surface pollution is large, involution boundary standardization is poor, and machining efficiency is low can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of assembly marking of large-size wall panel parts, and relates to a process information laser marking method for assisting the assembly of large-size wall panel parts. Background Art

[0002] With the continuous development of the aviation industry and the continuous design and launch of new aircraft models, the requirements for product quality and production efficiency are constantly increasing. Modern aircraft design places higher demands on the surface quality of parts, especially large wall panel parts. As an important component of the aircraft, their surface condition directly affects the overall performance and appearance. In order to meet the new requirements of future aircraft manufacturing, refined processing marking, assembly accuracy control and surface quality protection technology have become increasingly important. During the assembly and processing of large-scale wall panel parts, when operators mark assembly and processing information such as hole positions, various contaminants such as ink, oil and even shoe prints are often left on the surface of the wall panel. This not only directly affects the appearance of the parts, but in serious cases, it even affects the assembly accuracy, causing many inconveniences for subsequent processing. In particular, for wall panels made mainly of titanium alloys and composite materials, subsequent stain cleaning is more complicated, and improper handling can seriously affect the entire machine spraying process after assembly.

[0003] Furthermore, large-scale wall panel parts often exhibit complex edges, such as jagged edges, during assembly. Due to the lack of precise boundary demarcation standards, the margins retained during design and processing fluctuate widely, often ranging from 5 to 10 mm. Removing margins and aligning components often rely on the operator's experience and judgment, resulting in low assembly standardization and efficiency. Traditional manual assembly marking processes are no longer able to meet the demands of increasingly sophisticated manufacturing.

[0004] CN 115304802 A discloses a fast-curing protective film and its application. The film, which cures within 5 seconds, is prepared using polyester diol, dibasic acid alcohol ester, and acrylic monomer. However, it requires a relatively high temperature of 200°C to achieve adhesive-free peeling, making it unsuitable for large wall panels. CN 118755330A discloses an environmentally friendly peelable coating, its preparation method, and its application. Using a water-based acrylic emulsion as the primary component, along with various film-forming aids and other additives, the coating is formulated to be low-VOC and environmentally friendly. However, the coating cures in excess of 8 hours, requiring a film thickness of 70-80 μm. Such a thick protective coating can negatively impact subsequent assembly accuracy. CN 118875508A discloses a method and system for laser engraving textures on automotive interior parts. The system utilizes a visual lens assembly and a precision UVW visual alignment platform to position the processed parts, enabling precise engraving of interior textures. However, to prevent laser marking from adversely affecting parts requiring high-performance surfaces, more precise control of the laser trace depth and width is required. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a laser marking method for assisting the assembly of large-scale wall panel parts. By using a thin layer of coating that can be quickly cured and easily peeled off for spraying, it can play an effective anti-fouling role without affecting the assembly accuracy; at the same time, combined with the automated laser marking process, various types of hole positions and edge boundaries can be further accurately delineated on the thin coating, and more refined assembly operations can be achieved without destroying the appearance and performance of the parts, thereby improving production efficiency and quality, and providing a new feasible solution for high-performance parts that face similar problems in related fields. The present invention can solve the problems of large surface contamination, poor standardization of matching boundaries, and low processing efficiency in the traditional parts assembly marking process.

[0006] The technical solutions of the present invention are as follows:

[0007] A laser marking method for assisting the assembly of large-scale wall panel parts includes the following steps:

[0008] Step 1: Spray the paint and cure it to form a fast-curing, peelable thin layer on the surface of large-sized wall panel parts. The thickness of the paint layer is controlled within the range of 5-10 μm.

[0009] Step 2: Use laser marking to make assembly marks and precise edge boundary divisions on the thin layer. The laser marking depth is controlled to be less than 5μm and the trace width is less than 0.1mm. After marking, the thin layer is processed according to the assembly marks, and the margins are removed and aligned according to the division boundaries.

[0010] Step 3: Use a high-pressure water gun to spray and strip the surface coating of the parts, complete cleaning and drying, ensure that the surface of the parts is in a clean state and send them to the next process.

[0011] In step 1, the components of the coating include, by weight, 15-25 parts of an acrylic monomer having a hydrolyzable group, 65-75 parts of a modified acrylic prepolymer, 3-5 parts of a photoinitiator, 1.5-3.5 parts of a film-forming aid, 1-3 parts of an inorganic additive, 0.5-1 parts of a thickener, and 0.1-0.3 parts of a defoaming agent.

[0012] The preparation process of the acrylic monomer with hydrolyzable groups and the modified acrylic prepolymer is as follows: hydrolyzable groups are introduced into the acrylic monomer by an ester exchange method to form an acrylic monomer with hydrophilic groups; and then the acrylic monomer with hydrolyzable groups is subjected to a bulk / solution free radical polycondensation route to form a modified acrylic prepolymer; the hydrolyzable groups are one or a mixture of two or more of the group consisting of carboxylic acid groups, ester groups, amide groups, and aminoacetic acid groups; and the number average molecular weight of the modified acrylic prepolymer is 5000-8000.

[0013] The acrylic monomer is one or a mixture of two or more of hydroxy acrylate, amino acrylate and vinyl ether acrylate.

[0014] The photoinitiator is a free radical photoinitiator, which is one or a mixture of two or more of benzophenone, benzophenone, diphenylethylene, 651 photoinitiator, and ethoxybenzophenone.

[0015] The inorganic additive is used to improve the coating's resistance to trampling and laser ablation, and is one or a mixture of two or more of aluminum silicate, talc, silicon dioxide, and titanium dioxide.

[0016] In step 1, the spraying environment temperature is controlled at 20-30° C. and the relative humidity shall not exceed 60%.

[0017] The spraying is carried out by air spraying, with a spraying pressure of 0.2-0.6 MPa, a spraying distance of 15-30 cm, a spraying speed controlled at 0.5-2 m / s, and a single spraying to form a film.

[0018] The spray coating is rapidly cured by ultraviolet irradiation, with a wavelength range of 320-400 nm, preferably a wavelength of 365 nm, and a curing time of 5-20 s.

[0019] In step 2, the laser marking is performed with nitrogen or cold air as auxiliary jet to reduce the thermal impact and ensure the clarity of the assembly mark and boundary division.

[0020] The laser marking adopts an ultraviolet laser with a laser power of 3-10W, a preferred wavelength of 355nm, a pulse width of 10-100ns, a pulse frequency of 20-100kHz, and a line speed of 100-500mm / s.

[0021] The UV laser is gripped by a robotic arm. A computer-aided design system generates a 3D model of a large-scale wall panel part and automatically generates a marking path. Path planning is optimized using genetic algorithms or ant colony algorithms to ensure accuracy and efficiency. The marking process uses G-code or ISO6983 format for precise execution. Workpiece positioning is determined in real time by a machine vision system, using industrial cameras or CCD cameras for feedback, ensuring the laser beam is precisely aligned with the target area and compensating for deviations in real time.

[0022] In step 3, the water pressure is set in the range of 2-5 MPa, the distance between the cleaning nozzle and the coating surface is maintained at 10-30 cm, and warm water of 30-50° C. is preferably used for cleaning and film removal to improve the stripping efficiency.

[0023] The present invention has the following advantages:

[0024] This invention provides a new process for standardizing and refining assembly markings on large-scale siding components. First, a single spray application of a 5-10 μm thin, fast-curing, peelable layer makes the component surface stain-resistant and resistant to trampling. Assembly markings are then automatically laser-marked onto the layer. Finally, after the components are assembled and aligned, the protective layer is rapidly peeled off using a high-pressure water jet. This entire process enables detailed and precise marking of assembly marks on the surfaces of large-scale siding components without compromising assembly accuracy.

[0025] 2. The present invention provides a method for preparing a UV-fast curing and water-soluble peelable coating. By introducing a hydrolyzable group to modify an acrylic prepolymer, adding an acrylic monomer with a hydrophilic group, selecting a free radical photoinitiator, and rationally adding inorganic additives, the prepared coating can be rapidly cured within 5-20 seconds and can be completely peeled off under water cleaning conditions. At the same time, the coating has trampling resistance and anti-fouling functions, and laser marking process operations can be performed on the film, which can effectively assist in the assembly marking of large-size wall panel parts.

[0026] 3. The present invention provides a laser marking process method for engraving assembly marks on organic coatings. The marking depth is controlled within 5μm and the trace width is less than 0.1mm. This can ensure the high precision of the assembly marks and the clarity of the part alignment boundary division, greatly reducing manual experience-based operations, improving the standardization of part manufacturing, and meeting the needs of refined assembly.

[0027] 4. The method of the present invention is applicable to auxiliary assembly marking of large-sized wall panel parts including titanium alloy, carbon-based composite materials, stainless steel and aluminum alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1(a) to Figure 1(c) This is an example diagram of a large-size wall panel sample, where O is the center of the circle and X is the location where the hole is to be punched;

[0029] Figure 2 Flow chart for assembly marking of large-size siding parts assisted by rapid curing peelable coating spraying and laser marking processes. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0031] A laser marking method for assisting the assembly of large-scale wall panel parts involves spraying a water-soluble, removable coating that is rapidly cured by ultraviolet light, followed by an ultraviolet laser marking process. The coating is primarily composed of a modified acrylic prepolymer rich in hydrolyzable groups, an acrylic monomer with a hydrophilic group, and a free radical photoinitiator. The coating's resistance to trampling and laser ablation is enhanced by the addition of an appropriate amount of inorganic additives. The coating is formed into a film using a single spray application and can be rapidly cured within 5-20 seconds under ultraviolet irradiation. The cured coating has a thickness of 5-10 μm, and can achieve surface anti-fouling and anti-damage during the assembly marking process of large-scale wall panel parts without affecting assembly accuracy. A robotic arm clamps the ultraviolet laser to perform automated laser marking of assembly holes, lines, and patterns on a thin layer. The marking depth is controlled within 5 μm, and the trace width is less than 0.1 mm. This allows for more detailed and accurate assembly information labeling without affecting the surface quality of the part itself. After the parts are assembled and matched, the surface coating of the parts is cleaned with a high-pressure water gun. The water-soluble coating can be quickly peeled off to ensure the best surface condition of the parts.

[0032] Optionally, a translucent colored coating can be formed by adding an appropriate amount of dye to the paint to better check the coating removal after peeling. After cleaning, an infrared radiation lamp or a hot air gun can be used to accelerate the drying of the parts.

[0033] Optionally, an appropriate amount of solvents such as lower alcohol or acetone may be added to the coating to better improve the hydrolysis stripping properties of the coating.

[0034] Optionally, in addition to spraying, the fast-curing peelable coating can also be formed into a film by brushing, rolling and scraping, and used for local auxiliary assembly marking of parts.

[0035] Optionally, in addition to using an ultraviolet laser for laser marking, a fiber laser may also be used for marking to form an assembly mark, preferably with a wavelength of 1064 nm.

[0036] Example 1: Preparation of a fast-curing peelable coating

[0037] The following three methods for monomer modification, prepolymer preparation, and coating component ratios for fast-curing strippable coatings are provided. All raw materials are calculated in parts by weight:

[0038] (1) Amide-modified amino acrylate monomers: 2-(acrylamido)ethyl hydrogen succinate monomers are formed by ester exchange between 2-hydroxyethylacrylamide (HEAA) and succinic anhydride. The reaction is carried out in dichloromethane at a temperature of 65°C and catalyzed by N-methylimidazole for 13 hours to cause the hydroxyl group of HEAA to undergo ring-opening esterification with succinic anhydride to generate a half-ester monomer.

[0039] Prepolymer synthesis: Using the bulk / solution free radical polycondensation route, azobisisobutyronitrile (AIBN) was used as the initiator under the protection of inert nitrogen, and the polymerization was stirred in an oil bath at 60°C for 4 hours to obtain an amide-modified acrylic prepolymer with a number average molecular weight of 7000.

[0040] The coating component ratio is: 71.5 parts of amide-modified acrylic prepolymer, 21.4 parts of 2-(acrylamido)ethyl hydrogen succinate monomer, 3.5 parts of benzophenone, 1.8 parts of film-forming aid, 1 part of aluminum silicate, 0.5 parts of thickener, and 0.3 parts of defoamer.

[0041] (2) Carboxylic acid-modified hydroxyacrylate monomers: 2-(Acryloyloxy)ethyl hydrogen succinate monomers are formed by transesterification of 2-hydroxyethyl acrylate (HEA) with succinic anhydride. In dichloromethane, at 65°C, with N-methylimidazole as the catalyst, the HEA and succinic anhydride undergo ring-opening esterification to form a half-ester monomer.

[0042] Prepolymer synthesis: Using the bulk / solution free radical polycondensation route, azobisisobutyronitrile (AIBN) was used as the initiator under the protection of inert nitrogen, and the polycondensation was carried out at a reaction temperature of 65°C for 5 hours to obtain a carboxylic acid-modified acrylic prepolymer with a number average molecular weight of 7000.

[0043] The coating component ratio is: 65.1 parts of carboxylic acid modified acrylic prepolymer, 24.3 parts of 2-(acryloyloxy)ethyl hydrogen succinate monomer, 3 parts of benzophenone, 3.5 parts of film-forming aid, 3 parts of talc, 1 part of thickener, and 0.1 part of defoaming agent.

[0044] (3) Modification of vinyl ether acrylate monomers with aminoacetic acid groups: 2-(Acryloyloxy)ethylaminoacetate monomers were formed by transesterification of 2-vinyloxyethyl acrylate (VEEA) with chloroacetic acid. In dichloromethane, the -O- site of VEEA was transesterified with chloroacetic acid at 65°C for 12 h under the catalysis of N-methylimidazole to form a half-ester monomer.

[0045] Prepolymer synthesis: Using the bulk / solution free radical polycondensation route, azobisisobutyronitrile (AIBN) was used as the initiator under the protection of inert nitrogen, and the polycondensation was carried out at a reaction temperature of 60°C for 6 hours to obtain an aminoacetic acid group-modified acrylic acid prepolymer with a number average molecular weight of 8000.

[0046] The coating component ratio is: 74.5 parts of aminoacetic acid modified acrylic prepolymer, 15.5 parts of 2-(acryloyloxy)ethylamino acetate monomer, 4.2 parts of 651 photoinitiator, 3.2 parts of film-forming aid, 1.6 parts of titanium dioxide, 0.8 parts of thickener, and 0.2 parts of defoaming agent.

[0047] Taking the first preparation ratio as an example, a general preparation method of the coating is provided, which includes the following steps:

[0048] (1) Add the prepared prepolymer and monomer in proportion to a stirring container and mix thoroughly. The stirring speed is controlled at 300 rpm, the temperature is maintained at 25°C, and the stirring time is 20 minutes.

[0049] (2) Add inorganic additive powder, increase the stirring speed to 500 rpm, disperse for 15 minutes, and then slowly add film-forming aid and continue stirring for 10 minutes;

[0050] (3) Gradually add thickener according to the required viscosity of the coating, reduce the stirring speed to 300 rpm, and continue stirring for 10 minutes. Add defoamer and continue stirring for 5 minutes to remove bubbles during the mixing process;

[0051] (4) Transfer the base solution to a dim light or dark room environment, continue to reduce the speed to 100 rpm, slowly add the photoinitiator, and stir for 15 minutes;

[0052] (5) Use a 300-mesh stainless steel filter to filter the prepared paint to remove the incompletely dispersed and larger particles. Transfer the paint to an opaque sealed container for storage at 25°C. Avoid exposure to high temperatures and strong light.

[0053] Example 2: Laser marking of process information to assist in the assembly of large-size wall panel parts

[0054] Select typical large-size wall panel samples for implementation instructions, such as Figure 1(a) to Figure 1(c) The radius r of the semicircular arc panel sample is 3m (i.e., the diameter d is 6m), the panel thickness t is 8mm, the panel length h is 10m, and the cross-section on both sides of the panel is a serrated edge, with the tooth height m1 and tooth pitch m2 both being 0.1m.

[0055] It is planned to punch holes on the outer surface of the wall panel. The entire wall panel has 10 holes, marked as K1, K2, K3...K10 , K1-K4 are threaded holes with a diameter of φ6, and the distance from the side edge and the semi-arc end face of the wall panel is n1, and the length is 0.5m. The middle area of ​​the wall panel is distributed with threaded holes K5-K 10 , the hole spacing n2 is 0.1m, where K5 and K 10 is a threaded hole with a diameter of φ4, K6-K9 is a threaded hole with a diameter of φ3, K 10 The distance n3 from the side edge of the wall panel is 3m, and the distance n4 from the semi-arc end face is 0.8m.

[0056] The following are three examples of laser marking processes. The general process is as follows: Figure 2 As shown, the process includes five steps: surface pretreatment of parts, paint spraying, coating curing and thickness measurement, laser marking on the film, assembly and coating stripping.

[0057] (1) Use cold air to blow the surface of the parts to remove dust and fine adsorbents on the surface of the parts. Use ethanol or acetone to wipe the local contaminated areas and dry them. Use an air spray gun to spray the surface of the parts once, with a spray thickness of 5μm, a spray pressure of 0.2Mpa, a spray distance of 15cm, a spray speed of 2m / s, a spraying environment temperature of 25℃, and an ambient humidity of 40%. Use a 320nm ultraviolet radiation lamp panel to irradiate the parts, and set the power to 800mW / cm 2 , irradiation distance 50cm, irradiation time 8s; after complete curing, use eddy current thickness gauge to measure the thickness of each part of the part, and the thickness display between 5 and 10μm is considered qualified; use fixture to fix and clamp the parts to ensure that the parts are stable and without shaking. Adjust the position of the robotic arm and the focal length of the UV laser to ensure that the spot is focused on the surface of the film. Set the marking path and text pattern, the laser power is 3W, the wavelength is 355nm, the pulse width is 30ns, the pulse frequency is 50kHz, and the line speed is 500mm / s; cold air is used to assist the spray during the laser marking process to reduce the heat effect until the assembly marks and boundary lines are completed; according to the marks, the drilling and part alignment are carried out. After assembly, use a high-pressure water gun to flush and clean, the water pressure is set at 2MPa, and the distance between the cleaning nozzle and the coating surface is kept at 30cm. Use 30℃ warm water to clean and remove the film, and use hot air to dry. After drying, check the surface again to ensure that there are no water marks or residues.

[0058] (2) Pretreatment of the part surface: Use cold air to blow to remove dust and fine adsorbents on the part surface. Use ethanol or acetone to wipe the local contaminated area and dry it. Use an air spray gun to spray the part surface once, with a spray thickness of 8μm, a spray pressure of 0.4Mpa, a spray distance of 20cm, a spray speed of 1.5m / s, a spraying environment temperature of 25℃, and an ambient humidity of 40%. Use a 365nm ultraviolet radiation lamp panel to irradiate the part, and set the power to 1000mW / cm2 , irradiation distance 50cm, irradiation time 12s; after complete curing, use eddy current thickness gauge to measure the thickness of each part of the part, and the thickness display is 8±3μm, which is considered qualified; use tooling to fix and clamp the parts to ensure that the parts are stable and without shaking. Adjust the position of the robotic arm and the focal length of the UV laser to ensure that the spot is focused on the surface of the film. Set the marking path and text pattern, the laser power is 5W, the wavelength is 355nm, the pulse width is 75ns, the pulse frequency is 80kHz, and the line speed is 300mm / s; cold air is used to assist the spray during the laser marking process to reduce the heat effect until the assembly marks and boundary lines are completed; according to the marks, the drilling and part alignment are carried out. After assembly, use a high-pressure water gun to flush and clean, the water pressure is set at 3.5MPa, and the distance between the cleaning nozzle and the coating surface is kept at 20cm. Use 40℃ warm water to clean and remove the film, and use hot air to dry. After drying, check the surface again to ensure that there are no water marks or residues.

[0059] (3) Use cold air to blow the surface of the parts to remove dust and fine adsorbents on the surface of the parts. Use ethanol or acetone to wipe the local contaminated areas and dry them. Use an air spray gun to spray the surface of the parts once, with a spray thickness of 10μm, a spray pressure of 0.6Mpa, a spray distance of 30cm, a spray speed of 0.5m / s, a spraying environment temperature of 25℃, and an ambient humidity of 40%. Use a 400nm ultraviolet radiation lamp panel to irradiate the parts, and set the power to 1200mW / cm 2 , irradiation distance 50cm, irradiation time 20s; after complete curing, use eddy current thickness gauge to measure the thickness of each part of the part, and the thickness display between 10±5μm is considered qualified; use tooling to fix and clamp the parts to ensure that the parts are stable and without shaking. Adjust the position of the robotic arm and the focal length of the UV laser to ensure that the spot is focused on the surface of the film. Set the marking path and text pattern, the laser power is 10W, the wavelength is 355nm, the pulse width is 90ns, the pulse frequency is 100kHz, and the line speed is 100mm / s; cold air is used to assist the spray during the laser marking process to reduce the heat effect until the assembly marks and boundary lines are completed; according to the marks, the drilling and part alignment are carried out. After assembly, use a high-pressure water gun to flush and clean, the water pressure is set at 5MPa, and the distance between the cleaning nozzle and the coating surface is kept at 15cm. Use 50℃ warm water to clean and remove the film, and use hot air to dry. After drying, check the surface again to ensure that there are no water marks or residues.

[0060] After the above process, such large-size wall panel parts can reach the preparation state before process information marking within 30 minutes. The use of automated laser marking technology can reduce the manual input in the process information marking process by more than 5 people, and the design and processing margin is reduced to within 1mm, and the overall assembly efficiency is improved by 20%.

[0061] The core of the process stability of the present invention is the thickness and uniformity of the spray coating, the uniformity of the light-curing radiation field, and the regulation of the laser marking process parameters. Traditional manual marking is limited by the requirements for the cleanliness of the wall panel surface. During the assembly marking process, only very simple thin line markings can be made for the hole positions and related distance information. There are problems such as fuzzy marks, confusion of processing information, and large marking errors. During actual assembly, further reference to paper process specification documents is required. By adopting the laser marking method of the present invention, various types of hole position information, dimensional data, and special requirements of related parts can be marked in detail on the wall panel surface in the form of data, letters, and even text, without affecting the accuracy of subsequent assembly processing and the appearance of the wall panel surface, thereby greatly improving assembly efficiency. At the same time, the precise division of part boundaries can also improve the standardization of assembly, reduce errors in manual operations, and facilitate the alignment of parts.

Claims

1. A laser marking method for assisting the assembly of large-scale wall panel parts, characterized in that: Here are the steps: Step 1: Spray the paint and cure it to form a fast-curing, peelable thin layer on the surface of large-sized wall panel parts. The thickness of the paint layer is controlled within the range of 5-10 μm. Step 2: Use laser marking to make assembly marks and precise edge boundary divisions on the thin layer. The laser marking depth is controlled to be less than 5μm and the trace width is less than 0.1mm. After marking, the thin layer is processed according to the assembly marks, and the margins are removed and aligned according to the division boundaries. Step 3: Use a high-pressure water gun to spray and strip the surface coating of the parts, complete cleaning and drying, ensure that the surface of the parts is in a clean state and send them to the next process; In step 1, the components of the coating include, by weight, 15-25 parts of an acrylic monomer having a hydrolyzable group, 65-75 parts of a modified acrylic prepolymer, 3-5 parts of a photoinitiator, 1.5-3.5 parts of a film-forming aid, 1-3 parts of an inorganic additive, 0.5-1 parts of a thickener, and 0.1-0.3 parts of a defoaming agent.

2. A laser marking method for assisting the assembly of large-scale wall panel parts according to claim 1, characterized in that: The preparation process of the acrylic monomer with hydrolyzable groups and the modified acrylic prepolymer is as follows: hydrolyzable groups are introduced into the acrylic monomer by an ester exchange method to form an acrylic monomer with hydrophilic groups; and then the acrylic monomer with hydrolyzable groups is subjected to a bulk / solution free radical polycondensation route to form a modified acrylic prepolymer; the hydrolyzable groups are one or a mixture of two or more of the group consisting of carboxylic acid groups, ester groups, amide groups, and aminoacetic acid groups; and the number average molecular weight of the modified acrylic prepolymer is 5000-8000.

3. According to the laser marking method for assisting the assembly of large-size wall panel parts according to claim 2, the acrylic monomer is one or a mixture of two or more of hydroxy acrylate, amino acrylate, and vinyl ether acrylate; the photoinitiator is a free radical photoinitiator, which is one or a mixture of two or more of benzophenone, benzophenone, diphenylethylene, 651 photoinitiator, and ethoxybenzophenone; the inorganic additive is used to improve the coating's resistance to trampling and laser ablation, and is one or a mixture of two or more of aluminum silicate, talc, silicon dioxide, and titanium dioxide.

4. According to the method for laser marking process information to assist the assembly of large-size wall panel parts as described in claim 1, in step 1, the spraying environment temperature is controlled at 20-30°C and the relative humidity shall not exceed 60%; air spraying is adopted, the spraying pressure is 0.2-0.6MPa, the spraying distance is 15-30cm, the spraying speed is controlled at 0.5-2m / s, and the film is formed by single spraying; the spraying coating is rapidly cured by ultraviolet light irradiation, the wavelength range is 320-400nm, and the curing time is 5-20s.

5. A laser marking method for assisting the assembly of large-size wall panel parts according to claim 4, wherein the wavelength is 365nm.

6. A laser marking method for assisting the assembly of large-size wall panel parts according to claim 1, wherein in step 2, the laser marking is assisted by nitrogen or cold air spraying.

7. According to a laser marking method for assisting the assembly of large-size wall panel parts as described in claim 1, in step 2, the laser marking uses an ultraviolet laser with a laser power of 3-10W, a wavelength of 355nm, a pulse width of 10-100ns, a pulse frequency of 20-100kHz, and a line speed of 100-500mm / s.

8. According to the method of laser marking process information for assisting the assembly of large-scale wall panel parts described in claim 7, the ultraviolet laser is clamped by a robotic arm, and a three-dimensional model of the large-scale wall panel parts is generated by a computer-aided design system and a marking path is automatically generated. The path planning is optimized using a genetic algorithm or an ant colony algorithm to ensure the accuracy and efficiency of the marking path; during the marking process, G-code or ISO6983 format is used to accurately perform the marking operation, the workpiece position is located in real time by a machine vision system, and an industrial camera or CCD camera is used for feedback to ensure that the laser beam is accurately aligned with the target area and to compensate for deviations in real time.

9. According to the laser marking method for assisting the assembly of large-size wall panel parts according to claim 1, in step 3, the water pressure is set in the range of 2-5 MPa, the distance between the cleaning nozzle and the coating surface is maintained at 10-30 cm, and 30-50°C warm water is used for cleaning and film removal.

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