Common knowledge of coating: comparative study on properties of anticorrosive coating products

Abstract: the performance of three kinds of common anticorrosive coatings on the market were tested and compared, mainly including the adhesion, high and low temperature impact, high and low temperature storage and three proofing performance of acrylic polyurethane paint, acrylic amino paint and alkyd amino paint In addition, the adhesion of paint film after high and low temperature storage was also tested, and the paint within the test range was compared The performance of the film is compared to provide the first-hand data for the future selection of paint Key words: acrylic polyurethane enamel; alkyd amino enamel; acrylic amino enamel 0 Introduction At present, the main anticorrosive coatings commonly used in China Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Abstract: to test and compare the performance of three kinds of common anticorrosive coatings on the market, mainly including acrylic polyurethane The adhesion, high and low temperature impact, high and low temperature storage and three proofing performance of paint, acrylic amino paint, alkyd amino paint, etc in addition, the adhesion of paint film after high and low temperature storage is also tested After comparison, the performance of paint film within the test range is compared to provide the first-hand data for later selection of paint Key words: acrylic polyurethane enamel; alkyd amino enamel; acrylic amino enamel Acrylic polyurethane enamel is a two-component coating with excellent weatherability, chemical resistance, decoration and three proofing properties Due to the tough film, it also has good impact resistance and wear resistance Acrylic amino paint machinery It has excellent performance and chemical resistance, outstanding weather resistance and salt fog resistance; alkyd amino paint has excellent adhesion, water resistance and gasoline resistance, but poor friction resistance and flexibility The reasonable pretreatment process can meet the three prevention requirements of moisture-proof, mildew proof and salt fog proof In order to compare the performance of several common anticorrosive coatings on the market, the author tested the adhesion, high and low temperature resistance, adhesion after high and low temperature test, and three protection performance of these coatings, which provided the first-hand test data for better understanding the performance of these coatings 1 Test part 1.1 matching combination of raw material composite coating: s06-n-2 primer + acrylic polyurethane finish (s04-60), strontium yellow primer + acrylic amino finish (a), zinc yellow primer (H06-2) + acrylic amino finish (b), zinc yellow primer (H06-2) + acrylic amino finish (c), zinc yellow primer (H06-2) + alkyd amino finish 1.2 test method in this test, according to the matching of paint and the coating requirements of paint type, different paint types are coated on the aluminum alloy low temperature oxidation test piece, the test piece to be painted is cleaned and degreased, the primer and composite coating are sprayed on the corresponding substrate according to the matching of paint, and the film performance is tested after drying See Figure 1 for the test steps Fig 1 paint performance test step tested the matching paint performance on the aluminum alloy low temperature oxidation test piece, compared the performance of different coatings, and the coating construction was carried out according to the best process parameters (drying temperature, drying time) in the paint specification 2 Test results and discussion 2.1 primer adhesion test because the primer directly contacts with the substrate, which is very important for the adhesion of the paint Therefore, the adhesion of various primers on different substrates (cross cut method) is tested first Generally, the adhesion index of anti-corrosion paint is ≤ Level 2 See table 1 for the test results of primer adhesion Table 1 adhesion test data record table of primer found that the adhesion of the above coating matching system on the aluminum alloy low temperature oxidation test piece met the requirements of ≤ 2, among which the adhesion of pure zinc yellow primer + acrylic polyurethane enamel, strontium yellow primer + acrylic amino paint a matching system was better than other combinations It is found that the adhesion of the above primers on the low temperature oxidation test piece of aluminum alloy is very good, which can meet the requirements of film adhesion 2.2 adhesion test of matching coating system: sometimes the paint peels off directly from the primer layer, sometimes from the top coat layer Since all products are coated with composite coating, the adhesion of composite coating on different substrates is tested See Table 2 for the test results Table 2 adhesion test of composite coating 2.3 high and low temperature impact test Most of the products of a certain unit need to be tested at high and low temperature after coating to test the environmental adaptability of the equipment Because the base material and the coating on it and the coefficient of thermal expansion and cold contraction of the paint film are inconsistent, it may have an impact on the film adhesion after this test Therefore, the film adhesion after high and low temperature impact and high and low temperature storage is tested High and low temperature impact test conditions: - 55 ℃ (30min) → 25 ℃ (3min) → 85 ℃ (3min); cycle times: 24 2.3.1 the adhesion of primer after high and low temperature impact test is shown in Table 3 Table 3 adhesion of primer after high and low temperature impact test the adhesion of paint film has no change, indicating that the high and low temperature impact test has no effect on the adhesion of primer 2.3.2 adhesion test of composite coating after high and low temperature impact test See Table 4 for adhesion test data of composite coating after high and low temperature impact test Table 4 test data of adhesion of composite coating after high and low temperature impact test show that the high and low temperature impact test has little effect on the adhesion of composite coating In the matching system, except the adhesion of zinc yellow primer + alkyd amino primer decreased by 1 grade, the other matching adhesion did not change, which shows that high and low temperature impact test has little effect on the adhesion of the paint film 2.4 high and low temperature storage test conditions: high temperature storage test temperature is 70 ℃, holding time is 48h; low temperature storage test temperature is - 50 ℃, 24h After the high and low temperature storage test, the paint film of all test pieces is complete without blistering, peeling and discoloration 2.4.1 after high and low temperature storage, the influence of high and low temperature impact on the adhesion of primer is tested first, and then the influence of high and low temperature impact test on the adhesion of composite coating is tested See Table 5 for the test results After the test, it was found that the adhesion of the primer did not change, indicating that the high and low temperature impact test had no effect on the adhesion of the primer Table 5 adhesion test data of primer after high and low temperature storage 2.4.2 adhesion test data of composite coating after high and low temperature storage see Table 6 Table 6 adhesion test data of composite coating after high and low temperature storage the adhesion of primer is basically not affected by high and low temperature storage test In the matching system, except the adhesion of zinc yellow primer + alkyd amino primer decreased by 1 grade, the other matching adhesion did not change, which shows that the high and low temperature storage test has little effect on the adhesion of the paint film 2.5 three prevention test 2.5.1 after the damp heat test, the paint layer on the surface of all test pieces shall be intact without blistering, falling off or discoloration The test conditions of damp heat test (GJB150.9-1986): alternating damp heat, 60 ℃ in high temperature section and 30 ℃ in low temperature section Table 7 adhesion test data of composite coating after damp heat test After damp heat test, adhesion of all low-temperature oxidation test pieces decreased by 1 level A707 + amf20, s06-n-2 + acrylic polyurethane film met the adhesion requirements 2.5.2 salt spray test conditions: temperature is (35 ± 2) ℃, NaCl solution concentration is (5 ± 1)%, pH is 6.5 ~ 7.2, and test time is 96h After salt spray test, the paint film of all test pieces did not change 2.5.3 mold test conditions: test temperature (27 ± 3) ℃, test time 24 days, test strains: Aspergillus niger, Aspergillus flavus, Penicillium cordiformis, Trichoderma globosum, etc After mould test, the mould test of acrylic amino paint (a, B, c) and acrylic polyurethane paint (s04-60, 8509) was grade 0, and the mould test of alkyd amino paint (a04-60) was grade 2 2.6 solvent resistance test put the test pieces coated with various composite coatings in water, gasoline and alcohol for solvent resistance test Through the test, it is found that the paint film of the composite coating does not change after being immersed in water for 20 days, the paint film does not change after being immersed in gasoline for 1 day, and the paint film does not change after being immersed in alcohol for 1 day, which fully meets the solvent resistance requirements of the paint film 3 Conclusion The composite system of zinc yellow primer + s04-60, strontium yellow primer + acrylic amino paint a, zinc yellow primer + acrylic amino paint B, zinc yellow primer + acrylic amino paint C, zinc yellow primer + alkyd amino paint was coated on the aluminum alloy low temperature oxidation test piece The adhesion, high and low temperature impact, high and low temperature storage, damp heat, salt spray and mould test were carried out S04-60 and acrylic amino paint film were found in the test Harder Among all the coatings tested, the performance of pure zinc yellow primer + s04-60, strontium yellow primer + acrylic amino paint a is the best, the performance of combination of zinc yellow primer + acrylic amino paint B, zinc yellow primer + acrylic amino paint C is the second, and the performance of zinc yellow primer + alkyd amino paint is the worst Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,