Accelerated evaluation method for self-polishing antifouling coating

Abstract

An accelerated evaluation method of a self-polishing antifouling coating comprises the following steps: carrying out a dynamic accelerated simulation test on the self-polishing antifouling coating, and judging the antifouling property and the expected life of the self-polishing antifouling coating by investigating the fouling state and the abrasion rate of the self-polishing antifouling coating after each period of dynamic accelerated simulation test. According to the accelerated evaluation method for the self-polishing antifouling coating, provided by the invention, the performance change of the self-polishing antifouling coating in the service process can be quickly and effectively investigated by combining the abrasion rate measurement of the self-polishing antifouling paint under the condition of simulating the actual working condition; meanwhile, the accelerated evaluation method is simple in analysis, good in result reproducibility, capable of scientifically, effectively, rapidly and simply evaluating the change effect of the antifouling performance of the self-polishing antifouling coating under the actual working condition along with the test time, and capable of effectively and rapidly evaluating the service life of the self-polishing antifouling coating. And the requirements of rapid research, development and screening of a long-acting self-polishing antifouling coating supporting system are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of detection methods, and more specifically, relates to an accelerated evaluation method for a self-polishing antifouling coating. Background Art

[0002] The performance of antifouling paint will directly affect the ship's speed, dry-docking time, sailing stability and service life. With the rapid development of China's shipbuilding industry, the requirements for the performance of antifouling paint are getting higher and higher, and the required service life of antifouling paint is getting longer and longer. At present, the antifouling coating below the waterline in China is mainly a self-polishing antifouling coating. The medium-term effectiveness of foreign standard self-polishing antifouling paint is 7 years, and the long-term effectiveness is 12 years; in recent years, China has also put forward the requirement for a long-term self-polishing antifouling coating with an effectiveness of 7 years or more.

[0003] So far, there is no standard test method and model for the rapid evaluation of the antifouling effectiveness of antifouling coatings at home and abroad. Patent 201210245221.6 discloses a rapid evaluation method for the antifouling life of a self-polishing antifouling coating. By measuring the average monthly abrasion rate at a certain sailing speed, combining the ship's sailing and stopping ratio and the sailing cycle, the average monthly abrasion rate is converted into the average annual abrasion rate, and the antifouling life of the antifouling coating is calculated using a model formula; however, this method is only based on the relationship between the coating thickness and the abrasion rate of the self-polishing antifouling paint to establish the life prediction, and does not consider the situation where the antifouling performance fails before the coating is completely worn out during the use of the antifouling paint. Patent 202080005863.1 discloses a rapid evaluation method for the leaching rate of antifouling agents in antifouling coatings. By immersing the antifouling coating sample before the test in a mixed solution of NaOH solution, glycine and NaCl, the cuprous oxide in the coating will accelerate the release of copper ions, so as to quickly obtain the copper ion leaching rate of the coating; this method is suitable for quickly screening coating formulas in the laboratory and excluding coating formulas with poor copper ion leaching rates before the shallow sea panel test of the coating; however, the immersion solution used in this method is different from the actual service environment of the ship, and the copper ion leaching condition in the un-abraded coating is also different from the actual service state of the ship, so it is not applicable to the life assessment of antifouling paint under actual conditions. Patent 202111440638.3 discloses an accelerated test method for evaluating the performance of antifouling coatings with multi-factor coupling. This method first conducts pressure alternating, temperature alternating, salinity alternating, and dissolved oxygen alternating tests, and then conducts real sea immersion, dynamic simulation, indoor copper ion leaching rate and adhesion tests on the samples after the tests to achieve the performance evaluation of the antifouling coating; however, this method is only applicable to simulating the antifouling coating of submersibles, and the subsequent indoor copper ion leaching rate also does not conform to the actual environment of ship service.

[0004] The above patents play a certain role in the research and development of medium- and short-term effective antifouling coatings in China. However, for the life evaluation of self-polishing antifouling paints and the requirement for a long-term service life (more than 7 years), currently, it is mainly estimated through the results of ship / sea exposure tests and dynamic simulation tests.

[0005] Although ship tests and sea exposure tests in the actual marine environment are still the most reliable and effective methods for investigating the performance of antifouling coatings, ship tests are costly and have a long test cycle. Sea exposure tests in the actual marine environment place the antifouling coating in an open natural sea area environment, subject it to the combined action of various natural sea area factors, and observe the changes in its performance over time. It is used to evaluate the comprehensive performance of the antifouling coating when exposed under actual sea conditions (service conditions). Like ship tests, sea exposure tests in the actual marine environment require a long time, with a test cycle of up to several years (especially for long-term effective antifouling paints). Therefore, it cannot fully meet the requirements for the research and development, formulation screening, and actual promotion and application of long-term effective self-polishing antifouling paint products. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an accelerated evaluation method for self-polishing antifouling coatings, which can, under simulated actual working conditions, combine the determination of the abrasion rate of self-polishing antifouling paints to quickly and effectively investigate the performance changes of self-polishing antifouling coatings during service. At the same time, this accelerated evaluation method has simple analysis and good result reproducibility, and can scientifically, effectively, quickly, and simply evaluate the change effect of the antifouling performance of self-polishing antifouling coatings over test time under actual working conditions, effectively and quickly evaluate the service life of self-polishing antifouling coatings, and meet the requirements for the rapid research and development and screening of long-term effective self-polishing antifouling coating systems.

[0007] The present invention provides an accelerated evaluation method for self-polishing antifouling coatings, comprising the following steps:

[0008] Conduct a dynamic accelerated simulation test on the self-polishing antifouling coating, and determine the antifouling performance and expected life of the self-polishing antifouling coating by examining the fouling state and abrasion rate of the self-polishing antifouling coating after each cycle of the dynamic accelerated simulation test.

[0009] Preferably, the device for the dynamic accelerated simulation test is a real-sea dynamic simulation device or an indoor dynamic simulation device.

[0010] Preferably, the thickness of the self-polishing antifouling coating is ≥ 80 μm;

[0011] The self-polishing antifouling coating is subjected to condition adjustment under specified conditions before the dynamic accelerated simulation test.

[0012] Preferably, the surface linear velocity of the sample in the dynamic accelerated simulation test is 9 knots to 50 knots.

[0013] Preferably, the dynamic test time in the first cycle of the dynamic acceleration simulation test is ≥ 30 days; starting from the second cycle, the dynamic test time is ≤ 9 days.

[0014] Preferably, during the dynamic acceleration simulation test, after each cycle of the dynamic test, the sample is transferred to the device for the dynamic acceleration simulation test for a shallow sea immersion test of ≥ 30 days.

[0015] Preferably, the state is determined according to the regulations on anti-fouling performance evaluation, film physical state determination, and overall performance evaluation in GB / T 5370. When the overall performance score is lower than 85 points, it is determined as failed.

[0016] Preferably, the abrasion rate is tested and calculated according to the following steps:

[0017] 1) The abrasion rate samples after each cycle of the dynamic acceleration simulation test are determined for the abrasion rate according to the laser ranging analysis method of Type II templates in GB / T 31411-2015, and the abrasion rate is calculated based on the total test time of each cycle, with the unit of μm / month; the average value of the abrasion rates of all samples is taken as the abrasion rate value of this cycle;

[0018] 2) The next cycle of the test is carried out with the tested samples until the test ends.

[0019] Preferably, the determination process of the expected life is specifically as follows:

[0020] 1) Taking self-polishing anti-fouling coatings with known actual ship lifetimes as references, determine the lifetimes corresponding to the test cycle numbers; according to this test method, the self-polishing anti-fouling coating to be evaluated is corresponded with the actual test cycle numbers, and the lifetime of the self-polishing anti-fouling coating is determined, with the unit of year;

[0021] 2) Conduct life determination according to formula (I):

[0022] 3) Comprehensive life prediction:

[0023] Take the shorter life of the above two predictions as the comprehensive predicted life of the tested self-polishing anti-fouling coating, with the unit of year.

[0024] Preferably, the formula (I) is:

[0025] Y = D × t 动 / (E m × 12 × (t 总 )) (I);

[0026] Where: Y - predicted service life, with the unit of year;

[0027] D - total dry film thickness, with the unit of μm;

[0028] E m- is the monthly abrasion rate, with the unit of μm / month;

[0029] t 动 - is the dynamic test time, with the unit of days;

[0030] t 总 - is the total test time, with the unit of days.

[0031] The present invention provides an accelerated evaluation method for a self-polishing antifouling coating, comprising the following steps: performing a dynamic accelerated simulation test on the self-polishing antifouling coating, and determining the antifouling performance and expected life of the self-polishing antifouling coating by examining the fouling state and abrasion rate of the self-polishing antifouling coating after each cycle of the dynamic accelerated simulation test. Compared with the prior art, the accelerated evaluation method for the self-polishing antifouling coating provided by the present invention adopts specific process steps and conditions to achieve a better overall interaction: it can combine the determination of the abrasion rate of the self-polishing antifouling paint under simulated actual working conditions, so as to quickly and effectively examine the performance changes of the self-polishing antifouling coating during service; at the same time, this accelerated evaluation method has simple analysis and good result reproducibility, and can scientifically, effectively, quickly and simply evaluate the change effect of the antifouling performance of the self-polishing antifouling coating with the test time under actual working conditions, effectively and quickly evaluate the service life of the self-polishing antifouling coating, and meet the requirements of rapid research and development and screening of the supporting system for long-lasting self-polishing antifouling coatings. Description of the Drawings

[0032] Figure 1 is a schematic diagram of the actual sea dynamic simulation acceleration test device in Embodiment 1 of the present invention;

[0033] Figure 2 is an example of the installation and fixation of the test sample in Embodiment 1 of the present invention. Detailed Embodiments

[0034] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] The present invention provides an accelerated evaluation method for a self-polishing antifouling coating, comprising the following steps:

[0036] Performing a dynamic accelerated simulation test on the self-polishing antifouling coating, and determining the antifouling performance and expected life of the self-polishing antifouling coating by examining the fouling state and abrasion rate of the self-polishing antifouling coating after each cycle of the dynamic accelerated simulation test.

[0037] The object of the present invention is to establish an accelerated simulation test method for self-polishing antifouling coatings in real sea and laboratory environments. Based on the speed / stopping ratio of a ship in its actual service state, a dynamic simulation test of antifouling paint is carried out, and on the basis of the dynamic simulation, the fouling state and abrasion rate of the antifouling coating are tested. It is a test method for evaluating the service life of the antifouling coating from two aspects: the attachment process of fouling organisms in the real sea and the coating wear. This test method is simple and efficient, and can provide a new test technology for the development of self-polishing antifouling coatings, quickly evaluate and screen the performance of medium- and long-term self-polishing antifouling paints in the shortest possible time, and is of great significance for standardizing the performance evaluation, product R & D and in-service application of antifouling paints. The use of this test method can improve the success rate of developing medium- and long-term self-polishing antifouling coatings, reduce the ship repair and maintenance costs, reduce the number of dry dockings, extend the dry docking interval, and greatly improve the ship's antifouling level.

[0038] The present invention first conducts a dynamic acceleration simulation test on the self-polishing antifouling coating. There are no special restrictions on the type and source of the self-polishing antifouling coating of the present invention, and commercially available products of self-polishing antifouling coatings for ships well-known to those skilled in the art can be used.

[0039] In the present invention, the thickness of the self-polishing antifouling coating is preferably ≧80 μm, more preferably 80 μm - 500 μm; it is applied on the surface of the substrate by coating.

[0040] In the present invention, the substrate includes a steel substrate and a non-metal substrate, and surface treatment is preferably carried out before coating. Among them: for each sample of the steel substrate, it is processed according to GB / T 9271, and the specific steps are as follows:

[0041] ① Organic solvent cleaning: Use a rag dipped in a solvent such as alcohol to clean the oil stains, grease and other pollutants on the surface of the sample plate;

[0042] ② Dry abrasive jet cleaning: Use compressed air abrasive jet or centrifugal abrasive jet to clean the rust and scale on the surface of the sample plate;

[0043] ③ After the jet cleaning is completed, remove the jet cleaning residues, and use a vacuum cleaner or oil-free and water-free compressed air to clean the surface dust. The surface cleanliness after cleaning should reach the Sa21 / 2 level specified in GB / T 8923.1, or other agreed levels; the surface roughness should reach the medium (G) level specified in GB / T 13288.1, or other agreed levels.

[0044] The non-metal substrate is processed according to the following steps:

[0045] ① Organic solvent cleaning: Use a rag dipped in a solvent such as alcohol to clean the oil stains, grease and other pollutants on the surface of the sample;

[0046] ②Use sandpaper of a certain grade for grinding, and try to keep the plane of the grinding sandpaper and the plane of the substrate basically parallel, without grinding out a semi-circular surface.

[0047] ③After grinding, the dust on the surface of the substrate should be removed.

[0048] In the present invention, the process of the coating (paint coating) is preferably carried out according to the method specified for the test product system, such as air spraying or airless spraying, etc. The present invention has no special restrictions on this.

[0049] In the present invention, before the dynamic acceleration simulation test of the self-polishing antifouling coating (the test panel after coating), it is preferably conditioned in an indoor environment with a temperature of 21°C to 25°C and a relative humidity of 45% to 55% for 5 to 10 days, and then put into the test as soon as possible; or conditioned according to the agreed conditions.

[0050] In the present invention, the device for the dynamic acceleration simulation test is preferably a real sea dynamic simulation device or an indoor dynamic simulation device, more preferably a real sea dynamic simulation device; wherein, the real sea dynamic simulation device can be fixed on an offshore platform, and can be a drum method driven by a motor to rotate the sample, or a pipeline circulating water method with variable speed generated by different pipe diameters, both of which can make the water flow velocity on the surface of the sample reach the set value to simulate the state of a ship during navigation; the static immersion can be carried out on the test facilities specified in GB / T 5370 under real sea conditions; the indoor dynamic simulation device can complete both the dynamic test and the static immersion test simulated in the laboratory at the same time. Similar to the above real sea dynamic simulation device, it can be a drum method driven by a motor to rotate the sample, or a pipeline circulating water method with variable speed generated by different pipe diameters, and can include basic units for speed control and temperature control, and can also include control units for filtration, pH value, dissolved oxygen, etc. By rotating the motor or flushing with flowing water, the required relative water flow velocity (relative to the seawater in the test device) is generated on the surface of the sample.

[0051] In the present invention, the abrasion rate test device is the same as the device for the above dynamic acceleration simulation test; preferably, the film thickness measurement before and after the test adopts the measurement analysis method specified in GB / T 31411, and the thickness measurement device adopts the thickness measurement device specified in GB / T 31411.

[0052] In the present invention, the process of the dynamic acceleration simulation test is preferably specifically as follows:

[0053] (1) Install the dynamic simulation test sample and the abrasion rate sample on the device for the dynamic acceleration simulation test described in the above technical solution;

[0054] (2) Adjust the linear velocity on the surface of the sample to the required velocity; the linear velocity on the surface of the sample for the dynamic acceleration simulation test is preferably 9 knots to 40 knots;

[0055] (3) The dynamic test time of the first cycle of the dynamic acceleration simulation test is preferably ≥ 30 days, and as much of the antifouling coating thickness as possible should be abraded to achieve the purpose of acceleration; starting from the second cycle, the dynamic test time is preferably ≤ 9 days, more preferably 1 day to 5 days; after operating for the specified number of days in the steady state, the test panels are taken out and inspected and recorded according to the regulations of antifouling performance / physical properties of the paint film.

[0056] (4) During the process of the dynamic acceleration simulation test, after the dynamic test of each cycle is completed, all samples (including dynamic simulation test panels and abrasion rate test panels) are transferred to the device for the dynamic acceleration simulation test (preferably a real sea test facility) for a shallow sea immersion test of ≥ 30 days.

[0057] After the test is completed, the test panels are taken out and inspected and recorded according to the regulations of antifouling performance / physical properties of the paint film.

[0058] (5) The above steps (1) to (4) are one cycle. The setting of the cycle time is based on the premise of conforming to the actual service conditions of the ship and is reasonably set in combination with the test environment of the test sea area, so as to achieve both a good acceleration effect and the purpose of effectively screening and distinguishing short-term effect, medium-term effect, long-term effect and ultra-long-term effect self-polishing antifouling paints; after the cycle is completed, all test panels are taken out and tested and evaluated.

[0059] In the present invention, the evaluation parameters and measurements preferably include:

[0060] (1) Antifouling performance / physical properties of the paint film: The test results are evaluated according to the regulations of antifouling performance evaluation and determination of the physical state of the paint film in GB / T 5370.

[0061] (2) Abrasion rate:

[0062] The abrasion rate is preferably measured and calculated according to the following steps:

[0063] 1) The abrasion rate samples after each cycle test in the dynamic acceleration simulation test are determined for the abrasion rate according to the laser ranging analysis method of type II test panels in GB / T 31411-2015, and the abrasion rate is calculated according to the total test time of each cycle, with the unit of μm / month; the average value of the abrasion rates of all samples is taken as the abrasion rate value of this cycle;

[0064] 2) The samples after testing are used for the next cycle test until the test is completed.

[0065] In the present invention, the determination of the service life of the self-polishing antifouling coating preferably includes:

[0066] (1) Failure determination: The state is determined according to the regulations of antifouling performance evaluation, determination of the physical state of the paint film and total performance evaluation in GB / T 5370. When the total performance is lower than 85 points, it is determined to fail.

[0067] (2) Life determination:

[0068] The determination process of the expected life is preferably specifically as follows:

[0069] 1) Taking self-polishing antifouling coatings with known actual ship lives as references, determine the lives corresponding to the number of test cycles; according to this test method, the self-polishing antifouling coating to be evaluated is corresponding to the actual number of test cycles, and the life of the self-polishing antifouling coating is determined, with the unit of year;

[0070] 2) Conduct life determination according to formula (I):

[0071] 3) Comprehensive life prediction:

[0072] Take the shorter life among the above two predictions as the comprehensive predicted life of the measured self-polishing antifouling coating, with the unit of year.

[0073] In the present invention, the formula (I) is preferably:

[0074] Y = D × t 动 / (E m × 12 × (t 总 )) (I);

[0075] Wherein: Y - predicted service life, with the unit of year;

[0076] D - total dry film thickness, with the unit of μm;

[0077] E m - monthly abrasion rate, with the unit of μm / month;

[0078] t 动 - dynamic test time, with the unit of day;

[0079] t 总 - total test time, with the unit of day.

[0080] This method organically unifies the antifouling performance and abrasion rate of the self-polishing antifouling coating onto the dynamic simulation accelerated test. By setting a dynamic simulation program that conforms to the actual service conditions of the ship, a dynamic accelerated simulation test of the antifouling paint is carried out. By examining the degree of fouling organism attachment or the abrasion rate value of the antifouling coating after each cycle of dynamic test, the antifouling performance and expected life of the self-polishing antifouling paint on the ship can be quickly determined and evaluated.

[0081] On this basis, the present invention achieves the following beneficial effects: The accelerated evaluation method for self-polishing antifouling coatings provided by the present invention changes the problems of inconsistent test procedures and irrelevant test result data in current tests such as dynamic simulation and abrasion rate. It unifies various tests into a test procedure based on dynamic simulation acceleration, and then conducts comparative analysis on its results, solving the trouble of inconsistent results in previous simulation tests, overcoming the disadvantage of long test time for self-polishing antifouling paints. Through reasonable equipment and test scheme design in the actual sea environment and laboratory simulation environment, it can truly, conveniently, and effectively predict and evaluate the service life of medium- and long-term self-polishing antifouling paints, thereby providing an important basis for the research and selection of medium- and long-term self-polishing antifouling paints, providing important technical support for the research and design selection of antifouling coatings, effectively saving research and development costs, and having high economic and social benefits.

[0082] The present invention provides an accelerated evaluation method for self-polishing antifouling coatings, comprising the following steps: conducting a dynamic acceleration simulation test on the self-polishing antifouling coating, and determining the antifouling performance and expected service life of the self-polishing antifouling coating by examining the fouling state and abrasion rate of the self-polishing antifouling coating after each cycle of the dynamic acceleration simulation test. Compared with the prior art, the accelerated evaluation method for self-polishing antifouling coatings provided by the present invention adopts specific process steps and conditions to achieve good overall interaction: it can combine the determination of the abrasion rate of the self-polishing antifouling paint under simulated actual working conditions, thereby quickly and effectively examining the performance changes of the self-polishing antifouling coating during service; at the same time, this accelerated evaluation method has simple analysis and good result reproducibility, and can scientifically, effectively, quickly, and simply evaluate the change effect of the antifouling performance of the self-polishing antifouling coating with the test time under actual working conditions, effectively and quickly evaluate the service period effect of the self-polishing antifouling coating, and meet the requirements of rapid research and screening of long-term antifouling coating matching systems.

[0083] To further illustrate the present invention, the following detailed description is provided through the following examples.

[0084] Example 1

[0085] (1) Test device:

[0086] This example is carried out in the actual sea, and the device used is as Figure 1 shown.

[0087] (2) Substrate and surface treatment:

[0088] 1) Steel substrate for dynamic test:

[0089] The steel substrate of Q235 is used for the dynamic simulation acceleration samples in the actual sea, with dimensions of 260mm×100mm×3mm, and 2 pieces for each matching parallel sample.

[0090] Treatment of the sample substrate:

[0091] Unless otherwise specified, each sample of the steel substrate is treated in accordance with GB / T 9271 as follows:

[0092] ① Organic solvent cleaning: Clean the surface of the sample with a cloth dipped in a solvent such as alcohol to remove contaminants such as oil and grease.

[0093] ② Dry abrasive blasting cleaning: Use compressed air abrasive blasting or centrifugal abrasive blasting to clean the rust and scale on the surface of the sample.

[0094] ③ After the blasting cleaning is completed, remove the blasting cleaning residue, and use a vacuum cleaner or oil-free and water-free compressed air to clean the surface dust. The surface cleanliness level after cleaning should reach Sa2 1 / 2 level specified in GB / T 8923.1, or other agreed levels; the surface roughness should reach medium (G) level specified in GB / T 13288.1, or other agreed levels.

[0095] 2) Non-metallic substrate for abrasion rate test:

[0096] The abrasion rate test panel uses an epoxy fiberglass substrate with dimensions of 90mm × 60mm × 3mm, and 3 parallel samples are provided for each set.

[0097] Substrate treatment of the test panel:

[0098] ① Organic solvent cleaning: Clean the surface of the sample with a cloth dipped in a solvent such as alcohol to remove contaminants such as oil and grease.

[0099] ② Polish with sandpaper of a certain grade, and try to keep the plane of the sandpaper and the plane of the substrate basically parallel, without polishing a semi-circular surface.

[0100] ③ After polishing, the dust on the surface of the substrate should be removed.

[0101] (3) Coating system and painting:

[0102] The coating system selected for the test is shown in Table 1.

[0103] Table 1 Coating system information for the test

[0104] Serial number Supporting Dry film thickness of antifouling paint / μm Antifouling period effect of actual ship 1 Self-polishing antifouling paint supporting 1 300 Known 1 year 2 Self-polishing antifouling paint supporting 2 500 Known 3 years 3 Self-polishing antifouling paint supporting 3 360 Designed for 3 years

[0105] Use airless spraying for painting the sample set.

[0106] (4) Drying and conditioning:

[0107] The coated test panel is conditioned for 7 days in an indoor environment with a temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) %.

[0108] (5) Dynamic simulation test procedure for the example:

[0109] 1) Install the dynamic simulation test samples and abrasion rate samples onto the real-sea dynamic simulation acceleration test device in step (1). For example, Figure 2 .

[0110] 2) Adjust the linear velocity of the sample surface to (18 ± 2) knots according to the normal ship speed;

[0111] 3) In this embodiment, the dynamic test time for the first cycle is set to 30 days. As much anti-fouling paint as possible should be abraded in the early stage of the test to achieve the purpose of acceleration. After the dynamic test, move all samples (including the dynamic simulation templates and abrasion rate templates) to the real-sea test raft for a 60-day shallow sea immersion test.

[0112] Starting from the second cycle, in order to achieve the acceleration effect, the static immersion time should be increased as much as possible to facilitate the growth and firm attachment of fouling organisms. On the premise of not affecting the working mechanism of the self-polishing anti-fouling paint, a 1:12 sailing-to-stopping ratio is adopted in the test, that is, the dynamic rotation test time is 5 days and the shallow sea immersion test time is 60 days.

[0113] 4) The above steps 1) to 3) are one cycle. After each cycle ends, take out all the templates, conduct tests and calculate the abrasion rate:

[0114] ① Measure the abrasion rate of the abrasion rate samples after each cycle of the dynamic simulation test according to the laser ranging analysis method of type II templates in GB / T 31411-2015, and calculate the abrasion rate according to the total test time of each cycle, with the unit of μm / month; take the average value of the abrasion rates of all samples as the abrasion rate value of this cycle;

[0115] ② Use the tested samples to conduct the next cycle of tests until the test ends.

[0116] (6) Results of the accelerated simulation test of the self-polishing anti-fouling coating:

[0117] The results of the dynamic simulation test are shown in Table 2.

[0118] Table 2 Data table of the dynamic simulation test

[0119]

[0120]

[0121] It can be seen from the test data in the above table that for the dynamic simulation acceleration test of the self-polishing anti-fouling paint carried out according to this embodiment, 3 cycles are equivalent to the service life effect of 1 year; 6 cycles are equivalent to the service life effect of 3 years. Compared with the dynamic test specified in GB / T 7789-2007, this test method can significantly shorten the assessment time of the self-polishing anti-fouling paint, that is, it has an obvious acceleration assessment effect.

[0122] The abrasion rate test and the calculation results according to formula (I) are shown in Table 3.

[0123] Y = D × t 动 / (E m × 12 × (t 总 )) (I);

[0124] Where: Y - predicted service life, unit: year;

[0125] D - total dry film thickness, unit: μm;

[0126] E m - monthly abrasion rate, unit: μm / month;

[0127] t 动 - dynamic test time, unit: day;

[0128] t 总 - total test time, unit: day.

[0129] Among them, at 3 cycles, t 动 is 40 days, t 总 is 220 days; at 6 cycles, t 动 is 55 days, t 总 is 415 days.

[0130] Table 3 Data Sheet of Abrasion Rate Test

[0131]

[0132]

[0133] It can be seen from the test data in the above table that for the dynamic simulation acceleration test of the self-polishing antifouling paint carried out according to this embodiment, the service life is determined based on the measured abrasion rate and the coating thickness specified by the paint manufacturer. For Set 1, which is a product with a known 1-year protection period effect, the calculated result is 0.9 year. Biological fouling began to attach at the start of the 2nd cycle of the dynamic simulation, but it did not fail. According to the comprehensive life assessment of this test method, the service life is 0.9 year; for Set 2, which is a product with a known 3-year protection period effect, the calculated result is 2.5 years. Biological fouling began to attach at the start of the 5th cycle of the dynamic simulation, but it did not fail. According to the comprehensive life assessment of this test method, the service life is 2.5 years. In summary, the calculation results of this test method are more in line with the actual service conditions.

[0134] Therefore, the calculated service life of Set 3 according to this method is 2.8 years, and the service life determined according to the dynamic results is 3 years. So, according to the comprehensive life assessment of this test method, the service life is 2.8 years. It meets the expected 3-year protection period effect designed by the manufacturer, and the evaluation results are reliable.

[0135] (7) Test effect:

[0136] According to the requirements of the present invention, self-polishing antifouling paints with different known effective periods are selected for simulated accelerated tests. By testing and comparing the antifouling performance and abrasion rate of samples at different test cycles and in the actual sea / laboratory, the change trend of the antifouling performance of the samples with the dynamic simulated accelerated test cycle and the determination limits of characteristic indexes (such as the release rate of antifouling agents) can be obtained. The test results show that this test method can be used for testing the antifouling performance of self-polishing antifouling paints under the actual working conditions of ships, and its results can be used to evaluate the service life of self-polishing antifouling paints more accurately, providing an important basis for the selection of antifouling paints and important technical support for the research and development, actual ship application design and service life evaluation of long-acting self-polishing antifouling coatings.

[0137] In summary, the present invention provides an accelerated test method for carrying out antifouling performance tests of coatings in the actual sea environment and laboratory environment. Through the reasonable design of the test scheme, under the condition of simulating the actual working conditions, combined with the determination of the abrasion rate of self-polishing antifouling paints, the performance changes of self-polishing antifouling coatings during service can be quickly and effectively investigated. At the same time, this accelerated evaluation method has simple analysis and good result reproducibility, and can scientifically, effectively, quickly and simply evaluate the change effect of the antifouling performance of self-polishing antifouling coatings with the test time under the actual working conditions, effectively and quickly evaluate the service life of self-polishing antifouling coatings, and meet the requirements of rapid research and development and screening of long-acting antifouling coating systems.

[0138] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An accelerated evaluation method for a self-polishing antifouling coating, characterized in that, It includes the following steps: Conduct a dynamic acceleration simulation test on the self-polishing antifouling coating. By examining the fouling state and abrasion rate of the self-polishing antifouling coating after each cycle of the dynamic acceleration simulation test, determine the antifouling performance and expected life of the self-polishing antifouling coating.

2. The accelerated evaluation method of the self-polishing antifouling coating according to claim 1, characterized in that, The device for the dynamic acceleration simulation test is a full-sea dynamic simulation device or an indoor dynamic simulation device.

3. The accelerated evaluation method of the self-polishing antifouling coating according to claim 1, characterized in that, The thickness of the self-polishing antifouling coating is ≥ 80 μm; The self-polishing antifouling coating is conditioned under specified conditions before the dynamic acceleration simulation test.

4. The accelerated evaluation method of the self-polishing antifouling coating according to claim 1, wherein The surface linear velocity of the sample in the dynamic acceleration simulation test is 9 knots to 50 knots.

5. The accelerated evaluation method of the self-polishing antifouling coating according to claim 1, characterized in that The dynamic test time for the first cycle of the dynamic acceleration simulation test is ≥ 30 days; starting from the second cycle, the dynamic test time is ≤ 9 days.

6. The accelerated evaluation method of the self-polishing antifouling coating according to claim 5, wherein During the dynamic acceleration simulation test, after each cycle of the dynamic test, move the sample into a full-sea immersion device for a shallow-sea immersion test of ≥ 30 days.

7. The accelerated evaluation method of the self-polishing antifouling coating according to claim 1, characterized in that, The state evaluation is carried out according to the provisions of GB / T 5370, that is, the antifouling property evaluation and the physical state evaluation of the paint film are carried out respectively, and then the total performance evaluation is carried out. When the total performance is lower than 85 points, it is determined to be failed.

8. The accelerated evaluation method of the self-polishing antifouling coating according to claim 1, characterized in that, The abrasion rate is tested and calculated according to the following steps: 1) Measure the abrasion rate of the abrasion rate samples after each cycle of the dynamic acceleration simulation test according to the laser ranging analysis method of Type II templates in GB / T31411-2015, and calculate the abrasion rate according to the total test time of each cycle, with the unit of μm / month; take the average value of the abrasion rates of all samples as the abrasion rate value of this cycle; 2) Use the tested samples to carry out the next cycle of tests until the test ends.

9. The accelerated evaluation method of the self-polishing antifouling coating according to claim 1, wherein The determination process of the expected life is specifically as follows: 1) Taking the self-polishing antifouling coatings with known different actual ship lives as references, determine the life corresponding to the number of test cycles; according to this test method, the self-polishing antifouling coating to be evaluated is corresponding to the actual number of test cycles, and determine the life of the self-polishing antifouling coating, with the unit of year; 2) Conduct life determination according to formula (I): 3) Comprehensive life prediction: Take the shorter life among the above two predictions as the comprehensive predicted life of the measured self-polishing antifouling coating, with the unit of year.

10. The accelerated evaluation method of the self-polishing antifouling coating according to claim 9, characterized in that, The formula (I) is: Y = D × t 动 / (E m × 12 × (t 总 )) (I); Where: Y - predicted service life, with the unit of year; D - total dry film thickness, with the unit of μm; E m - is the monthly abrasion rate, with the unit of μm / month; t 动 - is the dynamic test time, with the unit of days; t 总 - is the total test time, in days.

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