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    Home > Coatings News > Paints and Coatings Market > Water-based peelable coatings are used in marine engineering projects.

    Water-based peelable coatings are used in marine engineering projects.

    • Last Update: 2020-10-09
    • Source: Internet
    • Author: User
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    Introduction:
    peelable coating is a functional coating for substation surface protection, with good construction, corrosion resistance and friction resistance. In the 1940s, the United States and other Western countries began to study peelable coatings and gradually applied to aerospace, weapons and equipment, automobiles and precision instruments and other components of temporary protection, China's related research began in the 1960s, started late and slow development. Solvent-based, water-based and hot-melt chemicals are currently

    . Organic solvent-based peelable coating has the advantages of simple coating, good mechanical properties of coating, short curing time, currently occupies a large market;
    Peelable coatings in the offshore industry application status quo
    Usually, large-scale ship or marine steel structure from steel plate cutting to cross-ship construction cycle of about 12 months, before entering the next process, coated steel structure or segments are often placed for a longer period of time, it is inevitable that a variety of pollutants will be covered in segments, such as sanding iron chips, welding smoke, ash layer, rainwater and so on. After tracking and statistics, the pollution position that is prone to appear in the assembly process is the upper surface, abdominal plate, grille surface, exterior plate of the living building, etc. on the upper surface of the lower wing of the deck H main beam, as well as the suspension and pipeline to be installed are susceptible to coating breakage and pollution.
    how to reduce coating damage and shorten coating cycle has become an urgent problem. Domestic use of peelable coatings reported cases are Shanghai Overseas Takahashi Shipbuilding Co., Ltd. and The yacht project of Lyfus using peelable protective coatings. At present, most of the domestic shipyards or projects for the protection of paint measures are still using canvas or aluminum foil and other traditional protection methods, the disadvantages of this method is not ideal for steel and plate structure protection effect, after pollution cleaning, pre-sea repair workload, high cost (before going to sea often need to organize a large number of manpower to clean, repair), some foreign projects began to use peelable protective materials technology, especially the United States, South Korea, Japan and other countries have many types of modular projects can be stripped of paint protection cases.
    Easy to pollute location
    peelable coatings in South Korea Samsung FPSO project application
    Currently marine engineering for the steel lower wing top surface paint protection has no special measures and methods, according to the domestic platform Caofeidian, Penglai project manpower input statistics, each The project before the sea 2 to 3 months of human input are showing a gradual increase, high form, the main work of this stage is cleaning and renovation work, these repair work is carried out in the field, can not achieve mechanical spraying, need a large number of manual grinding, repair, manpower input and paint consumption is very large. With the increasingly strict environmental protection requirements, how to reduce the pollution damage of paint in the assembly stage, shorten the coating construction cycle, site cleaning and manufacturing, reduce the emissions of unostained VOCS has become an urgent problem to be solved.
    Insurable peelable coating experiments
    experimental purposes
    in order to solve the assembly phase of air pollution, welding slag, grinding and other construction work caused by local area paint pollution damage caused by a large amount of manpower repair situation, in Penglai 19-4WHPK project Penglaidong 2 and Penglaidong 4 pieces of H-type steel lower wing surface and abdominal plate sprayed peelable paint. Experimental materials are selected for Hardtop Paints to peel off coatings and Huicheng Ecotech's Lingshi water-based peelable coatings. Both materials are single-part water-based coatings.
    through this experiment to verify the following four aspects:
    (1) peelable coating and other brand paint compatibility;
    (2) coating weather resistance experiment;
    (3) verification peelable effect,
    (4) assembly phase of the actual conditions can peel off the protective effect of the coating.
    the experimental process
    because the site paint coating damage is the majority, and paint repair work is the largest workload, so this experiment to the conventional use of polyurethane paint-based.
    experiment was conducted in Penglaidong 2 and 4 respectively.
    deck peelable coating protection process tracking
    -performance experiment
    dyring performance
    tested, the drying performance of the two peelable coatings is basically the same, as shown in Table 1.
    1 peelable coating drying time
    the test results show that the drying performance of the two peelable coatings is basically in line with their instructions.
    peelability experiment, the
    properties of the coating were analyzed under different drying times. After thorough drying, the coating peels off for excellent performance and continuous operation. After 3 months of construction, the protective coating is stripped and protected by site exposure and actual contamination coating.
    Pulation material stripping
    experimental results show that:
    (1) both protective coatings are good peelability, can achieve the effect of continuous peeling, to meet the requirements of large-scale peeling
    ; Peeling protective film into the film is the same, not easy to break, paint surface no residue.
    welding splash pollution experiment
    the peeling effect of the peelable protective material of different thickness models was carried out on the splash and solder slag experiment during welding.
    Welding heating and splashing pollution experiment
    the experimental results show that melting welding on the peelable coating damage is serious, damage to the serious area protection film has been burned through, splash damage to the protective film is small or does not affect the performance of the protective film;
    the curing and adhesion test of the original coating system after the
    protective coating is stripped, the curing and binding strength of the original coating system is tested, as shown in Figure 7.
    of the coating system curing and adhesion
    the experimental results show that the peelable protective material has no effect on the curing and binding strength, color, and luster of the coating system.
    Peelable coating use analysis report
    Take Penglai 19-4 blocks as an example, according to the following conditions for analysis:
    (1) the actual repair area accounted for 25% of the total coating area, of which 5% for welding metal grinding burn repair, 20% for hair refurbishment, coating damage repair;
    (2) 20% of the total coating area of the brushed refurbishment, coating repair area is a high-risk area of damage and contamination, should be coated peelable coating protection, 20% of the brushable area can be reduced to 5%, grinding and refurbishment time investment ratio of 4:1, save labor investment time of 40%.
    Conclusion
    Water-based peelable temporary protective coating, not only has sufficient adhesion, but also can be easily peeled off the protected surface, the adhesion, color and gloss of the protected paint does not affect. In addition, peelable coatings are water-based coatings, providing short-term protection for a range of pollutants, such as dust, grease, solder slag, rust, etc., but also to prevent a certain degree of mechanical impact damage, the protection of the substrate surface has a more positive role, and reduce the surface paint renovation work during loading manpower, reduce the risk of quality problems, save repair manpower time investment of 40%.
    authors , Wang Changjun, Cheng Guodong, Zhao Guangrui, etc.
    (Ocean Petroleum Engineering (Qingdao) Co., Ltd.)
    .
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