Method and system for rapidly detecting weather resistance of color-coated sheet

Abstract

The invention relates to the technical field of performance detection of coated steel plates, in particular to a method and a system for rapidly detecting weather resistance of a color-coated plate. According to the invention, a multi-factor coupling simulation test scheme is adopted, so that the weather resistance of the color-coated sheet is accurately detected under the multi-factor synergistic effect, the performance abnormal conditions such as coating peeling, blistering, depainting, rusting and the like possibly occurring in the use process of the color-coated sheet can be found in time, and unqualified products are prevented from entering users; according to the method, an evaluation method combining pre-evaluation and cyclic reinspection is adopted, qualified pre-evaluation is carried out on the treated sample piece through adhesive tape testing and appearance observation, color-coated products which do not meet requirements can be rapidly screened, the detection time is greatly shortened, the detection efficiency is improved, cyclic reinspection is combined with multiple environmental factors, and the detection efficiency is improved. The accuracy of the evaluation structure is further ensured, a reliable basis is provided for production and application of the color-coated sheet, and the method is simple in overall operation, high in practicability, wide in application prospect and easy to popularize.

Description

Technical Field

[0001] The present invention relates to the technical field of performance detection of coated steel plates, and in particular to a method and system for quickly detecting the weather resistance of color-coated plates. Background Art

[0002] With the rapid development of the global economy and the significant improvement in living standards, people's demand for diversified products has become more refined and classified. As a new material that is environmentally friendly, energy-saving, and easy to process and shape, color-coated steel sheets have been widely used in construction, home appliances, decoration, and other fields. As customers' requirements for the use and quality of color-coated products continue to rise, their application is becoming increasingly widespread. Light steel buildings, housing structures, high-rise curtain walls, and other applications have begun to directly use color-coated products on a large scale. In particular, metallic paint color-coated products have seen a continuous increase in market use in recent years due to their unique and aesthetically pleasing appearance.

[0003] Color-coated products are usually used directly after processing, so the various performance properties of the product are closely related to its ultimate service life and use effect.

[0004] Currently, relevant standards include "bending test", "reverse impact test", "scratch test", "cupping test" and other testing methods for the bending processing performance of color-coated products. These tests can detect the adhesion performance of the coating and the metal substrate when the steel plate is deformed during processing. They mainly test the performance of the color-coated products during user processing. However, the existing standards lack efficient and accurate testing methods for the weather resistance of color-coated products after installation, and traditional weather resistance testing methods generally have a long time period, which is very inconvenient in actual use. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and system for rapid detection of weather resistance of color-coated plates, which can realize rapid detection of weather resistance of color-coated plates under multi-factor coupling conditions, and has fast detection speed and high accuracy. It can timely detect abnormal performance conditions such as coating peeling, blistering, paint peeling, rust, etc. that may occur in the use of color-coated plates, and prevent unqualified products from entering the hands of users.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] 1. A rapid detection method for weather resistance of color-coated plates

[0008] The present invention provides a method for quickly detecting the weather resistance of a color-coated plate, which mainly comprises the following steps:

[0009] Step S1, sample preparation and pretreatment: select the color-coated plate sample to be tested and cut it into sample pieces of preset size, and wipe the surface of the sample piece with a cleaning agent to remove impurities such as oil, dust, etc. on the surface;

[0010] Step S2, bending test: the test surface of the specimen is facing downward and one end is inserted into the jaws of the bending instrument by a preset distance, and then the other end of the specimen is bent to a preset angle and maintained for a preset time before releasing the stress to simulate plastic deformation during bending use;

[0011] Step S3, flattening and restoring: applying a preset pressure to the bent portion of the sample piece using a flattening device for a preset time period to restore the sample piece to a flat state;

[0012] Step S4, recoil impact: using an impact tester to perform impact deformation on the preset deformation area in the middle of the front and back sides of the sample piece once with a preset impact force to test the deformation resistance of the coating;

[0013] Step S5, water bath penetration: start the water bath heater to immerse the sample piece in a deionized water solution at a preset temperature, and apply a preset cycle of circulating water pressure for a preset time period to promote water penetration at the coating interface;

[0014] Step S6, gradient drying: taking the sample piece out of the water bath heater and placing it in an oven, adjusting the temperature value in the oven, and performing gradient drying on the sample piece at different temperature values ​​in sequence to simulate the moisture migration process caused by the temperature difference between day and night;

[0015] Step S7, tape test pre-evaluation: Use a tape with a preset adhesive strength to stick to the bending area and recoil deformation area of ​​the sample, then quickly tear off the tape at a preset angle, and pre-evaluate the weather resistance of the color-coated plate by observing the shedding of the coating on the sample and the tape.

[0016] If any of the pre-assessment results are unqualified, the color-coated plate to be tested is directly judged as unqualified to improve the detection efficiency and save detection time; if all the pre-assessment results are qualified, the multi-environment cycle re-inspection in step S8 is continued to ensure the quality of qualified products and prevent defective products from entering the hands of users;

[0017] Step S8, multi-environment cycle re-inspection: place the qualified sample pieces in the composite environmental chamber, and conduct UV resistance, humidity and heat resistance, and cold and heat cycle tests in turn, and cycle the tests for n times to complete the re-inspection of the sample pieces.

[0018] Preferably, in step S1, the length of the sample piece is not less than 150 mm, and the cleaning agent is anhydrous ethanol or acetone to remove oil and dust on the surface of the sample piece.

[0019] Preferably, in step S2, one end of the sample piece is inserted into the jaws of the bender at a preset distance L≥10 mm, and the other end of the sample piece is bent using a mold with a radius R=1~5 mm, and the preset angle θ is an acute angle in the range of 30~90°, and the preset time is T1=5~15 min.

[0020] Preferably, in step S4, the impact tester is a drop hammer impact tester, and the interval between the preset deformation area on the front side of the specimen and the preset deformation area on the back side is not less than 20 mm.

[0021] Preferably, in step S5, the conductivity of the deionized water solution is ≤20 μS / cm, the heating temperature is 60-100°C, the circulating water pressure is 10-100 kPa, the cycle period is 3-5 minutes, and the preset duration T3 is dynamically adjusted according to the type of color-coated plate to be tested and the thickness of the sample piece.

[0022] Preferably, in step S6, the temperature and duration of the gradient drying are 40°C (2h), 60°C (2h), and 80°C (1h), respectively.

[0023] Preferably, in step S7, the bonding strength of the tape is (10+1)N / 25mm width. The tape is pasted on the bending area and recoil deformation area of ​​the sample piece, pressed with fingers and the bubble edge is removed. After the tape is pasted flat, it is quickly torn off at an angle of 60° to the sample surface.

[0024] The method for determining the weather resistance pre-assessment of the color-coated plate includes:

[0025] 1) Measurement of coating shedding in the tape adhesion area: Use a measuring tool to measure the size and area ratio of the shedding coating attached to the tape corresponding to the bending area and the recoil deformation area, and then compare them with the preset shedding size threshold and shedding ratio threshold respectively:

[0026] If the size of the peeling coating is greater than the peeling size threshold or the area ratio of the peeling coating is greater than the peeling ratio threshold, the pre-assessment result is determined to be unqualified; otherwise, the pre-assessment result is determined to be qualified;

[0027] 2) Recording the number of defects in the non-tape-adhered area: Use a magnifying glass to observe whether the non-tape-adhered area of ​​the sample has defects such as cracks, peeling, blistering, fading, etc., and record the type and number of defects, and then compare them with the preset total defect threshold:

[0028] If the number of defects is greater than the total defect threshold, the pre-assessment result is determined to be unqualified; otherwise, the pre-assessment result is determined to be qualified.

[0029] Preferably, in step S8, the multi-factor cycle is specifically as follows: transfer to a composite environmental chamber, perform "ultraviolet irradiation (340nm, 1.0W / m 2 The test was carried out under the following conditions: 1) humidity and heat (85℃, 95% RH, 2h) - hot and cold cycle (-20℃→80℃, 10℃ / min, 1 time), with a total of 10 cycles.

[0030] 2. A rapid detection system for weather resistance of color-coated plates

[0031] Based on the same inventive concept, the present invention also provides a rapid detection system for the weather resistance of color-coated plates, which adopts the rapid detection method for the weather resistance of color-coated plates as described above and mainly includes:

[0032] 1) A bending instrument, comprising a clamp and a bending mechanism, wherein the clamp is used to clamp and fix one end of the sample to be tested, and the bending mechanism is used to bend the other end of the sample to be tested, and the bending angle and bending time are adjustable;

[0033] 2) a flattening device, which is used to apply a preset pressure to the bent portion of the specimen to restore the specimen to a flat state;

[0034] 3) an impact tester, comprising a punch with adjustable impact force, for performing an impact deformation test on the front and back sides of the specimen;

[0035] 4) a water bath heater equipped with an ultrasonic vibrator and a water bath chamber filled with a preset volume of deionized water solution for performing a water bath penetration test on the specimen;

[0036] 5) a drying oven, wherein the temperature inside the drying oven is adjustable and used for gradient drying the sample pieces after water bath infiltration;

[0037] 6) A composite environmental chamber, wherein the composite environmental chamber is provided with an ultraviolet irradiation module, a humidity control module, and a temperature control module, and is used to perform ultraviolet irradiation resistance, humidity and heat resistance, and cold and heat cycle resistance tests on the specimens.

[0038] Compared with the prior art, the present invention has the following main advantages:

[0039] 1. Based on the tracking and testing of color-coated products, the present invention adopts a multi-factor coupling simulation test scheme. The mechanical stress of the color-coated products in actual use is simulated through bending, flattening, and recoil steps. The environmental influencing factors are simulated through water bath penetration, gradient drying, and multi-environment cycle testing steps. This achieves accurate testing of the weather resistance of color-coated boards under the synergistic effect of multiple factors. It can promptly detect performance abnormalities such as coating peeling, blistering, paint peeling, and rust that may occur during the use of color-coated boards, preventing unqualified products from reaching users.

[0040] 2. The present invention adopts an evaluation method that combines pre-evaluation with cyclic re-inspection. The pre-evaluation of the qualified test pieces after treatment is carried out through tape testing and surface observation. It can quickly screen out color-coated products that do not meet the requirements, greatly shortening the detection time and improving the detection efficiency. In addition, the cyclic re-inspection combined with multiple environmental factors further ensures the accuracy of the evaluation structure, providing a reliable basis for the production and application of color-coated plates.

[0041] 3. The detection system of the present invention is simple to operate and easy to maintain, and can accurately and quickly evaluate the weather resistance of color-coated plates. It has strong practicality, broad application prospects, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is an overall flow chart of a method for quickly detecting weather resistance of a color-coated plate in an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of a rapid detection system for weather resistance of color-coated plates in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0045] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0046] In the present invention, unless otherwise expressly specified or limited, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise expressly specified or limited.

[0047] Example 1: This example provides a method for quickly detecting the weather resistance of a color-coated plate. Figure 1 As shown, it mainly includes the following steps:

[0048] Step S1, sample preparation and pretreatment: select the color-coated plate sample to be tested and cut it into sample pieces of preset size, and wipe the surface of the sample piece with a cleaning agent to remove impurities such as oil, dust, etc. on the surface;

[0049] Step S2, bending test: the test surface of the specimen is facing downward and one end is inserted into the jaws of the bending instrument by a preset distance, and then the other end of the specimen is bent to a preset angle and maintained for a preset time before releasing the stress to simulate plastic deformation during bending use;

[0050] Step S3, flattening and restoring: applying a preset pressure (5 MPa in this embodiment) to the bent portion of the sample piece using a flattening instrument for a preset time (5 minutes in this embodiment) to restore the sample piece to a flat state;

[0051] Step S4, recoil impact: using an impact tester to perform impact deformation on the preset deformation area in the middle of the front and back sides of the sample piece once with a preset impact force to test the deformation resistance of the coating;

[0052] Step S5, water bath penetration: start the water bath heater to immerse the sample piece in a deionized water solution at a preset temperature, and apply a preset cycle of circulating water pressure for a preset time period to promote water penetration at the coating interface;

[0053] Step S6, gradient drying: taking the sample piece out of the water bath heater and placing it in an oven, adjusting the temperature value in the oven, and performing gradient drying on the sample piece at different temperature values ​​in sequence to simulate the moisture migration process caused by the temperature difference between day and night;

[0054] Step S7, tape test pre-evaluation: Use a tape with a preset adhesive strength to stick to the bending area and recoil deformation area of ​​the sample, then quickly tear off the tape at a preset angle, and pre-evaluate the weather resistance of the color-coated plate by observing the shedding of the coating on the sample and the tape.

[0055] If any of the pre-assessment results are unqualified, the color-coated plate to be tested is directly judged as unqualified to improve the detection efficiency and save detection time; if all the pre-assessment results are qualified, the multi-environment cycle re-inspection in step S8 is continued to ensure the quality of qualified products and prevent defective products from entering the hands of users;

[0056] Step S8, multi-environment cycle re-inspection: place the qualified sample pieces in the composite environmental chamber, and conduct UV resistance, humidity and heat resistance, and cold and heat cycle tests in turn, and cycle the tests for n times to complete the re-inspection of the sample pieces.

[0057] Furthermore, in step S1, the length of the sample piece is not less than 150 mm (in this example, the sample is cut into 160 mm × 75 mm, and the coating thickness is 25 μm), and the cleaning agent is anhydrous ethanol or acetone to remove oil and dust on the surface of the sample piece.

[0058] Furthermore, in step S2, one end of the sample piece is inserted into the jaws of the bender at a preset distance L≥10 mm, and the other end of the sample piece is bent using a mold with a radius R=1~5 mm, and the preset angle θ is an acute angle in the range of 30~90°, and the preset time is T1=5~15 min.

[0059] Furthermore, in step S4, the impact tester specifically adopts a drop hammer impact tester (in this embodiment, the hammer head has a mass of 500g and a drop height of 300mm), and the preset deformation area on the front side of the specimen and the preset deformation area on the back side are spaced at not less than 20mm.

[0060] Furthermore, in step S5, the conductivity of the deionized water solution is ≤20 μS / cm, the heating temperature is 60-100° C., the circulating water pressure is 10-100 kPa, the cycle period is 3-5 minutes, and the preset duration T3 is dynamically adjusted according to the type of color-coated plate to be tested and the thickness of the sample piece.

[0061] Furthermore, in step S6, after the sample is taken out of the water bath, the temperature of the oven is adjusted so that the sample is dried in a gradient manner at 40°C (2h), 60°C (2h), and 80°C (1h) in sequence to simulate the moisture migration process caused by the temperature difference between day and night;

[0062] Furthermore, in step S7, the adhesive strength of the tape is (10+1)N / 25mm width. The tape is pasted on the bending area and recoil deformation area of ​​the sample piece, pressed with fingers and the bubble edges are removed. After the tape is pasted flat, it is quickly torn off at an angle of 60° to the sample surface.

[0063] The method for determining the weather resistance pre-assessment of the color-coated plate includes:

[0064] 1) Measurement of coating shedding in the tape-adhesive area: Using a measuring tool, the size and area ratio of the detached coating attached to the tape corresponding to the bending area and the recoil deformation area are measured respectively, and then compared with the preset detached size threshold and detached ratio threshold, respectively. If the size of the detached coating is greater than the detached size threshold or the area ratio of the detached coating is greater than the detached ratio threshold, the pre-assessment result is determined to be unqualified; otherwise, the pre-assessment result is determined to be qualified;

[0065] 2) Recording the number of defects in the non-tape-adhered area: Use a magnifying glass to observe whether the non-tape-adhered area on the sample piece has defects such as cracks, peeling, blistering, fading, etc., and record the type and number of defects. Then compare with the preset total defect threshold. If the number of defects is greater than the total defect threshold, the pre-assessment result is judged to be unqualified; otherwise, the pre-assessment result is judged to be qualified.

[0066] Furthermore, in step S8, the multi-factor cycle is specifically as follows: transfer to a composite environmental chamber and perform "ultraviolet irradiation (340nm, 1.0W / m 2 The test was carried out under the following conditions: 1) humidity and heat (85℃, 95% RH, 2h) - hot and cold cycle (-20℃→80℃, 10℃ / min, 1 time), with a total of 10 cycles.

[0067] Example 2. This example provides a method for rapid testing the weather resistance of a color-coated plate. Two samples numbered 2-3# and 2-4# are used for testing. The two edge samples 2-3# and 2-4# are bent and flattened on the front and back sides, respectively, and a water bath adhesion test is performed together. The sample length is not less than 150mm, and the sample should be flat, with no oil stains, no damage, and no burrs on the edge.

[0068] The (0t) bending test includes: placing the test surface of the sample downward, inserting one end into the jaws of the bending instrument by about 10 mm, pressing the sample, and turning the handle to bend the sample to an acute angle of about 45°+10°.

[0069] The flattening test includes: taking out the sample, unfolding the bent part and placing it under a flattening instrument to flatten it as much as possible.

[0070] The recoil test includes: placing a sample that has completed 0t bending into an impact tester, and performing impact deformation once on the front and back with 9J energy, with the interval between the two deformation areas being no less than 20mm.

[0071] The water bath test includes: heating clean water (conductivity not exceeding 20μS / cm) to boiling and placing the prepared steel plate into the water bath container. The test time is shown in the table below:

[0072] variety PE SMP HDP PVDF FEVE Standard film thickness 3 minutes 5 minutes 5 minutes 8 minutes 8 minutes Thickened film thickness <![CDATA[Every 3 μ m plus 1 minute]]> <![CDATA[Every 3 μ m plus 2 minutes]]> <![CDATA[Every 3 μ m plus 2 minutes]]> <![CDATA[Every 5 μ m plus 3 minutes]]> <![CDATA[Every 5 μ m plus 3 minutes]]>

[0073] The drying process includes: after the water bath is finished, taking out the sample, and immediately drying the surface with a cold air blower or blotting the surface with absorbent paper.

[0074] The tape test includes: using a tape with a width of about 25mm and a bonding strength of (10+1)N / 25mm, applying the tape to the 0t and recoil deformation areas, pressing it with your fingers, removing air bubbles and sticking the tape flat, and then quickly tearing off the tape at a 60° angle to the sample surface.

[0075] Furthermore, the results were evaluated by observing the deformation and the peeling of the coating on the tape. The specific evaluation criteria are as follows:

[0076] project qualified 0t The shedding ratio is less than 70% and there is no shedding of pieces larger than 5mm Frontal recoil (front view) The shedding area is less than 10% Back recoil (front view) The shedding length is less than 20% of the annular circumference and no shedding length is greater than 3mm Front recoil (back view) The shedding area is less than 20% Back recoil (back view) The shedding length is less than 30% of the annular circumference and no shedding length is greater than 4mm

[0077] Furthermore, if one or more items in the above table are not in compliance, the assessment result is N (unqualified), otherwise it is Y (qualified); and the test results are recorded in the inspection ledger for registration.

[0078] Example 3, based on the same inventive concept, this embodiment also provides a rapid detection system for weather resistance of color-coated plates, using the rapid detection method for weather resistance of color-coated plates as described above, such as Figure 2 As shown, it mainly includes:

[0079] 1) A bending instrument, comprising a clamp and a bending mechanism, wherein the clamp is used to clamp and fix one end of the sample to be tested, and the bending mechanism is used to bend the other end of the sample to be tested, and the bending angle and bending time are adjustable;

[0080] In this embodiment, the angle error of the bending instrument is ±1°, and the pressure control accuracy is ±0.5MPa;

[0081] 2) a flattening device, which is used to apply a preset pressure to the bent portion of the specimen to restore the specimen to a flat state;

[0082] 3) an impact tester, comprising a punch with adjustable impact force, for performing an impact deformation test on the front and back sides of the specimen;

[0083] 4) a water bath heater equipped with an ultrasonic vibrator and a water bath chamber filled with a preset volume of deionized water solution for performing a water bath penetration test on the specimen;

[0084] 5) a drying oven, wherein the temperature inside the drying oven is adjustable and used for gradient drying the sample pieces after water bath infiltration;

[0085] 6) A composite environmental chamber equipped with a UV irradiation module, a humidity control module, and a temperature control module for testing the specimens for resistance to UV irradiation, resistance to humidity and heat, and resistance to cold and hot cycles;

[0086] In this embodiment, the temperature control accuracy of the composite environmental chamber is ±1° C., and the humidity control accuracy is ±2% RH.

[0087] Example 4: This example takes a batch of sea blue polyester color-coated products with a total front film thickness of 20 microns as an example. Because it is suspected that the front passivation liquid is unevenly coated during production, but the product passes the conventional adhesion test performance after the product is off the line, a rapid test of the product's weather resistance is performed according to the method of this application. The results are as follows:

[0088] project Test results and judgment 0t The shedding ratio is less than 50% (qualified) Frontal recoil (front view) The shedding area is less than 50% (unqualified) Back recoil (front view) The shedding length accounts for 40% of the ring circumference (unqualified) Front recoil (back view) No shedding (qualified) Back recoil (back view) No shedding (qualified)

[0089] Therefore, this batch of products was judged as unqualified, and the products were subjected to 1000 hours of unconventional "neutral salt spray resistance" and "humidity and heat resistance" related weather resistance performance tests. After the results came out, the weather resistance of the front coating failed, and only the back was qualified, which effectively prevented this batch of unqualified products from being shipped to customers.

[0090] Example 5. This example uses a batch of high-durability white-gray polyester color-coated products with a total front film thickness of 22 microns as an example. Because a conductivity monitoring failure in the cleaning section was suspected during production, but the product's conventional adhesion test performance was qualified after it was produced, a rapid weathering test of the product was conducted according to the method of this application. The results are as follows:

[0091] project Test results and judgment 0t The shedding ratio is less than 60% (qualified) Frontal recoil (front view) The shedding area is less than 40% (unqualified) Back recoil (front view) The shedding length accounts for 60% of the ring circumference (unqualified) Front recoil (back view) The shedding area is less than 50% (unqualified) Back recoil (back view) The shedding length accounts for 40% of the ring circumference (unqualified)

[0092] Therefore, this batch of products was judged as unqualified, and the products were subjected to 1500 hours of unconventional "neutral salt spray resistance" and "humidity and heat resistance" related weather resistance performance tests. After the results came out, the weather resistance of both the front and back coatings failed, effectively preventing this batch of unqualified products from being shipped to customers.

[0093] Example 6. This example takes a batch of white-gray polyester color-coated products with a total front film thickness of 20 microns as an example. During the process inspection and spot check, a rapid test of the product's weather resistance was performed according to the method of this application. The results are as follows:

[0094]

[0095]

[0096] Therefore, this batch of products was judged to be qualified, and the products were subjected to 1000 hours of unconventional "neutral salt spray resistance" and "humidity and heat resistance" related weather resistance performance tests. After the results came out, the weather resistance of both the front and back coatings were qualified.

[0097] Furthermore, all parts of this application that are not described in detail are the same as the existing technology or are implemented using the existing technology.

[0098] In summary:

[0099] 1. Based on the tracking and testing of color-coated products, the present invention adopts a multi-factor coupling simulation test scheme. The mechanical stress of the color-coated products in actual use is simulated through bending, flattening, and recoil steps. The environmental influencing factors are simulated through water bath penetration, gradient drying, and multi-environment cycle testing steps. This achieves accurate testing of the weather resistance of color-coated boards under the synergistic effect of multiple factors. It can promptly detect performance abnormalities such as coating peeling, blistering, paint peeling, and rust that may occur during the use of color-coated boards, preventing unqualified products from reaching users.

[0100] 2. The present invention adopts an evaluation method that combines pre-evaluation with cyclic re-inspection. The pre-evaluation of the qualified test pieces after treatment is carried out through tape testing and surface observation. It can quickly screen out color-coated products that do not meet the requirements, greatly shortening the detection time and improving the detection efficiency. In addition, the cyclic re-inspection combined with multiple environmental factors further ensures the accuracy of the evaluation structure, providing a reliable basis for the production and application of color-coated plates.

[0101] 3. The detection system of the present invention is simple to operate and easy to maintain, and can accurately and quickly evaluate the weather resistance of color-coated plates. It has strong practicality, broad application prospects, and is easy to promote.

[0102] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0103] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0104] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rapid detection method for weather resistance of color-coated plates, characterized in that: The steps include: Step S1, sample preparation and pretreatment: select the color-coated plate sample to be tested and cut it into sample pieces of preset size, and wipe the surface of the sample piece with a cleaning agent; Step S2, bending test: the test surface of the sample is facing downward and one end is inserted into the jaws of the bending instrument by a preset distance, and then the other end of the sample is bent to a preset angle and maintained for a preset time before releasing the stress; Step S3, flattening and restoring: applying a preset pressure to the bent portion of the sample piece using a flattening device for a preset time period to restore the sample piece to a flat state; Step S4, recoil impact: using an impact tester to perform impact deformation once on the preset deformation area in the middle of the front and back sides of the sample piece with a preset impact force; Step S5, water bath infiltration: start the water bath heater to immerse the sample piece in a deionized water solution at a preset temperature, and apply a preset cycle of circulating water pressure for a preset time period; Step S6, gradient drying: taking the sample piece out of the water bath heater and placing it in an oven, adjusting the temperature value in the oven, and performing gradient drying on the sample piece at different temperature values ​​in sequence; Step S7, tape test pre-assessment: Use a tape with a preset adhesive strength to stick tightly to the bending area and recoil deformation area of ​​the sample, then quickly tear off the tape at a preset tilt angle, and perform a pre-assessment of the weather resistance of the color-coated sheet by observing the shedding of the coating on the sample and the tape. If the pre-assessment results are unqualified, the color-coated sheet to be tested is directly judged to be unqualified. If the pre-assessment results are all qualified, proceed to step S8; Step S8, multi-environment cycle retest: place the qualified test pieces in the composite environmental chamber, and perform UV resistance, humidity and heat resistance, and cold and heat cycle tests in sequence, and perform the test for n cycles.

2. A rapid detection method for weather resistance of color-coated plates according to claim 1, characterized in that In step S1, the length of the sample piece is not less than a preset length threshold value of one, and the cleaning agent is anhydrous ethanol or acetone, which is used to remove oil and dust on the surface of the sample piece.

3. The method for rapid detection of weather resistance of color-coated plates according to claim 1, characterized in that In step S2, one end of the sample piece is inserted into the clamp of the bender for a preset distance not less than a preset length threshold of two, and the other end of the sample piece is bent using an arc mold with a preset radius, and the bending angle and bending time are set according to the material and size of the sample piece.

4. A rapid detection method for weather resistance of color-coated plates according to claim 1, characterized in that In step S4, the impact tester is specifically a drop hammer impact tester, and the interval between the preset deformation area on the front side of the specimen and the preset deformation area on the back side is not less than a preset interval distance value.

5. The method for rapid detection of weather resistance of color-coated plates according to claim 1, characterized in that In step S5, the conductivity of the deionized water solution does not exceed the preset conductivity threshold, and the heating temperature is within the preset temperature range. The pressure value, cycle period and water bath duration of the circulating water pressure are dynamically adjusted according to the type of color-coated plate to be tested and the thickness of the sample piece.

6. A rapid detection method for weather resistance of color-coated plates according to claim 1, characterized in that In step S6, the temperature control knob of the oven is adjusted so that the oven is in a plurality of different temperature values ​​in sequence, and the duration of each temperature value is adjustable.

7. A rapid detection method for weather resistance of color-coated plates according to claim 1, characterized in that In step S7, after sticking the tape to the bending area and the recoil deformation area of ​​the sample piece respectively, press it with your fingers to make the tape stick flat, and then quickly tear off the tape at a preset tilt angle.

8. The method for rapid detection of weather resistance of color-coated plates according to claim 7, characterized in that: The method for determining the weather resistance pre-assessment of the color-coated plate includes: 1) Measurement of coating shedding in the tape adhesion area: Use a measuring tool to measure the size and area ratio of the shedding coating attached to the tape corresponding to the bending area and the recoil deformation area, and then compare them with the preset shedding size threshold and shedding ratio threshold respectively: If the size of the peeling coating is greater than the peeling size threshold or the area ratio of the peeling coating is greater than the peeling ratio threshold, the pre-assessment result is determined to be unqualified; otherwise, the pre-assessment result is determined to be qualified; 2) Recording the number of defects in the non-tape-adhered area: Use a magnifying glass to observe and record the type and number of defects in the non-tape-adhered area of ​​the sample, and compare with the preset total defect threshold: If the number of defects is greater than the total defect threshold, the pre-assessment result is determined to be unqualified; otherwise, the pre-assessment result is determined to be qualified.

9. A rapid detection method for weather resistance of color-coated plates according to claim 1, characterized in that In step S8, the ultraviolet irradiation intensity, humidity cycle control value, and temperature cycle control value in the composite environmental box are all set according to the actual use environment of this batch of color-coated products.

10. A rapid detection system for weather resistance of color-coated plates, using the rapid detection method for weather resistance of color-coated plates according to any one of claims 1 to 9, characterized in that: include: 1) A bending instrument, comprising a clamp and a bending mechanism, wherein the clamp is used to clamp and fix one end of the sample to be tested, and the bending mechanism is used to bend the other end of the sample to be tested, and the bending angle and bending time are adjustable; 2) a flattening device, which is used to apply a preset pressure to the bent portion of the specimen to restore the specimen to a flat state; 3) an impact tester, comprising a punch with adjustable impact force, for performing an impact deformation test on the front and back sides of the specimen; 4) a water bath heater equipped with an ultrasonic vibrator and a water bath chamber filled with a preset volume of deionized water solution for performing a water bath penetration test on the sample piece; 5) a drying oven, wherein the temperature inside the drying oven is adjustable and used for gradient drying the sample pieces after water bath infiltration; 6) A composite environmental chamber, wherein the composite environmental chamber is provided with an ultraviolet irradiation module, a humidity control module, and a temperature control module, and is used to perform ultraviolet irradiation resistance, humidity and heat resistance, and cold and heat cycle resistance tests on the sample pieces.

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