This standard specifies the dynamic test method for evaluating the antifouling performance of antifouling paint in natural seawater. The dynamic test of antifouling paint is to simulate the state of a ship sailing by running the sample coated with antifouling paint in natural seawater continuously and immersing the plate during the peak growth season of marine fouling organisms. GB 7789-1987 Dynamic test method for antifouling performance of ship antifouling paint GB7789-1987 standard download decompression password: www.bzxz.net

UDC 667.61 :629.12
National Standard of the People's Republic of China
GB7789
Dynamic test method for performance of marine antifouling coatings
Published on 1987-05-25
Implemented on 1988-05-01
National Standard Issued
WNational Standard of the People's Republic of China
Dynamic test method for performance of marine antifouling coatings Dynamic test method for performance of marine antifouling coatings
This standard specifies the dynamic test method for evaluating the antifouling performance of antifouling coatings in natural seawater. 7789
Antifouling paint dynamic test is to combine the sample with antifouling paint installed, simulate the state of the ship when sailing, and continuously run in the water to prevent the growth of marine organisms. 1 Test conditions
1.1 Dynamic test location
The dynamic test device can be installed in the following locations: floating on the real sea;
Large natural seawater pool;
Seawater with flowing sand and natural seawater
1.2 Dynamic test equipment
1.2.1 The dynamic test equipment includes power, transmission, and sample fixing parts. The test equipment and sample fixing frame are shown in Appendix 4. The linear speed of the sample movement is required to be equivalent to 18±2kn (or approximately the common ship speed). The sample cannot be separated from the seawater when running. 1.2.2 The slow sea foam test of the dynamic test sample shall be carried out according to the floating test method specified in Chapter 2 of GB537085 Multi-antifouling continuous sample immersion test method 3.
1.2.3 Timing of dynamic test
The starting time of the dynamic test shall be selected according to the expected antifouling effect of the antifouling paint to be tested and the growth season of marine organisms at the test site. The test shall usually be started 2 months before the peak growth season of marine fouling organisms. The latter part of the dynamic test shall be within the growth season of fouling organisms. 2 Sample preparation
2.1 Dynamic test sample
2.1.1 The base material of the dynamic test sample is a 3mm thick low-carbon steel plate, and the size and shape are shown in Figure 1. At least three dynamic test samples are required for each test material. China Shipbuilding Industry Corporation 1987-04-0 Approved 1988-05-01 Implementation
WGB 7789-87
Figure】Dynamic test sample
2.1.2 The dynamic test sample may adopt other shapes, but the application area of ​​the test paint must not be less than the full installation area of ​​the rectangular sample specified in |-2.1.1.
2.1.3 The surface treatment of the sample base material shall meet the requirements of level 6 in (B809281 Ship Hull De-lure Standard). 2.1.4 The coating process of the test material used for the dynamic test sample shall meet the technical requirements of the coating. The film thickness shall be controlled according to the film thickness recommended by the coating matching system. 2.2 Control plate
2.2.1 The base material, size and shape of the control sample are the same as those of the dynamic test sample. 2.2.2 The preparation of the control plate is in accordance with Article 3.2 of GB5370:85 3.1 Install the prepared dynamic test sample and control sample on the sample fixing frame and immerse them in the water. Record the water temperature and the depth of the sample immersed in the seawater.
3.2 Start the device. And record the initial time, speed, cumulative rotation time and running mileage. Under the condition of constant speed, the sample runs continuously for 4000±50min. Then stop the machine, move the sample into the raft, and conduct the shallow sea immersion test of the antifouling paint sample. This is the first period of the dynamic test. 3.4 During the dynamic test, a small sample plate for permeability test should be placed: "Parallel test should be carried out together. And after each cycle, GB6821-86 Determination of ion permeability of ship bottom antifouling paint and GB6825-86 Determination of organic tin monomer permeability of ship bottom antifouling paint should be used to measure the paint permeability of antifouling paint. 4 Observation and record
4.1 Observation
4.1.1 After each test period, the sample surface needs to be observed, recorded and photographed. 4.1 .2 During observation, the sea mud attached to the sample should be carefully removed. The fouling organisms should not be removed, and the surface of the ball membrane should not be damaged. During observation, the FDmm along the edges of the mixing pull and the holes should be deducted to eliminate the edge effect. .4.1.3 The main types of marine fouling organisms observed include membrane pots, oysters, lime worms, bryozoans, mollusks, swim bladders, and lichens. Generally, the antifouling performance of the antifouling paint is evaluated according to the number of attached organisms and the area covered on the sample surface. 4.2 Record
According to 0B 5.2 of GB 5370-85. 5 Result evaluation
The test result evaluation shall be carried out in accordance with the relevant provisions of 6.5.1 and 6.5.3 of GB 537-85. 5.1
5.2 When the damage degree of the test sample exceeds that of the control sample according to the predetermined period or the coverage area of ​​the pollutant on the sample surface, the test shall be terminated and taken as the final test result.
.A.1 Test device as shown in Figure A1.
GB 7789
Appendix A
Schematic diagram of test device and sample fixing
(reference)
Figure A! Schematic diagram of test device
[Medium machine, 2 turns with. 3. Transmission adjustment, test sample W sample fixing as shown in Figure A2.
Additional instructions:
GB. 7789
Appendix A
Schematic diagram of test device and sample fixing bZxz.net
(reference)
Figure A! Schematic diagram of test device
[Medium machine, 2 turns with. 3. Transmission adjustment, test sample W sample fixing as shown in Figure A2.
Additional instructions:
GB. 7789
Appendix A
Schematic diagram of test device and sample fixing
(reference)
Figure A! Schematic diagram of test device
[Medium machine, 2 turns with. 3. Transmission adjustment, test sample W sample fixing as shown in Figure A2. 7
Figure A2 Sample fixing diagram
Top, F board, 2 plastic strips: screws: 4 test sample This standard was proposed by China State Shipbuilding Corporation and is under the jurisdiction of China Paint and Pigment Standardization Technical Committee. This standard is under the responsibility of Luoyang Ship Material Research Institute. The main drafters of the draft standard are Ma Zhizhong, Jin Xiaohong W
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