Coating classification: environmental friendly marine antifouling agent

Core tip: Product Introduction: environmental friendly marine antifouling agent is an assistant with antifouling effect applied in marine antifouling coatings In order to protect marine environment and maintain marine ecological balance, environmental friendly marine antifouling coatings have gradually replaced the traditional marine antifouling coatings and become the leading direction of marine antifouling coatings research in the future The antifouling efficiency of dcoit (isothiazolinone derivative), the active ingredient applied in the environment-friendly sea nine, has been widely verified in one cup of practice It can be attached to the hull again, thus reducing energy consumption, saving fuel and protecting Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Coating home news: Product Introduction: the environment-friendly marine antifouling agent is an assistant with antifouling effect applied in marine antifouling coatings In order to protect the marine environment and maintain the marine ecological balance, the environment-friendly marine antifouling coating has gradually replaced the traditional marine antifouling coating and become the leading direction of the future marine antifouling coating research The antifouling efficiency of dcoit (isothiazolinone derivative), the active ingredient used in the environmentally friendly sea nine, has been widely verified in one cup of practice It can be attached to the hull again, thus reducing energy consumption, saving fuel and protecting the atmospheric environment Molecular structure: BACKGROUND: traditional antifouling agents have toxic and killing effects on attached organisms, causing irreparable damage, and will pollute the environment and destroy the ecological balance The ideal marine antifouling agents should meet the following requirements: A they are active at low concentration; B they are economic; C they are harmless to human body and other organisms; D they are broad-spectrum; e they are pollution-free; F they are biodegradable The natural antifouling active substance comes from nature, which is close to the above six conditions, and can replace the antifouling agent harmful to the environment Development history: in the middle of the 19th century, the popular antifouling agents were mainly copper oxide, arsenic oxide and mercury oxide, which had been eliminated for their toxicity; in the middle of the 20th century, tributylorganotin (TBT), which had excellent antifouling effect, was clearly stipulated by the International Maritime Organization (IMO) because it was found to harm the marine ecological environment and even human health since January 1, 2008 It is forbidden to use from now on Therefore, in recent years, the research and development of low toxic or non-toxic antifouling agent has become a hot spot At the same time, with the rapid development of polymer materials, some functional resins for antifouling coatings have been reported in succession Properties: 1 The antifouling effect of antifouling performance on representative marine organisms 1 The antifouling performance of Willingham et al Found that antifouling coating containing sea-nine211 had a strong inhibition on the formation of marine bacterial mucosa, and the minimum inhibitory concentration MIC of Pseudomonas Atlantica and Pseudomonas nattica were both 0.1mg/l Xie Junbin, et al Reported that isothiazolinone has good killing and inhibiting effects on heterotrophic bacteria, Staphylococcus aureus, Escherichia coli, Candida albicans, proteus, carlardiococcus, Gram-positive bacteria, negative bacteria, fungi and yeast 2 The algal inhibition performance of Willingham et al Pointed out that sea-nine211 antifouling agent had a strong killing effect on entomorpha and diatom aphoraceaeformis, with LD50 of 0.002mg/l and 0.003mg/l respectively Jiangtao et al Found that isothiazolinone has a strong killing effect on Phaeocystis globosa, marine unicellular algae and palm algae 3 The inhibition of barnacle is one of the most widely distributed and numerous marine fouling organisms in the world; it is also the most harmful and frequent fouling organism to the bottom of the ship; it is also the most important component of the pipeline fouling organism Sea-nine211 antifouling agent has a better killing effect on barnacle than other non metabolic fungicides Willingham et al Pointed out that the LD50 of sea-nine211 antifouling agent to barnacle larvae is only 0.34mg/l 4 Toxicity to non target organisms, shade et al Found that the half lethal concentration of sea-nine211 to rainbow trout (salmogairdneri) was 2.7 μ g / L in flow test, and 9.7 μ g / L in static test The results of okamurah et al showed that the half lethal concentration of sea-nine211 to rainbow trout was 14 μ g / L at 28d 2、 The ideal antifouling agent for migration, transformation and distribution in the environment needs to meet the following conditions to ensure that the negative impact on the environment is within the controllable range, including: rapid degradation in the environment; rapid distribution in the environment, small bioaccumulation to non target marine organisms; and small toxicity to non target species under the use concentration Due to the hydrophobicity of dcoi, it is not easy to accumulate in water after entering the environment, but more likely to deposit in solid phase (such as rock, etc.), with the following characteristics: 1) dcoit is easy to adsorb in solid sediments, and its adsorption coefficient (Koc) can reach 15000; 2) metabolites of dcoit are also easy to adsorb in solid sediments; 3) Because there are many kinds of microorganisms on the surface of soil and solid sediment, the decomposition of dcoit adsorbed on the surface is faster; 4) the toxicity test based on the solid surface shows that the decomposition products of dcoit are less toxic 3、 Metabolism 1) metabolism in anaerobic environment: half-life is less than 1 h Its metabolites can be rapidly deposited and closely attached to the solid sedimentary layer; 2) metabolism in aerobic environment: the half-life is less than 1 h, and the metabolites are rapidly deposited 4、 Degradation and hydrolysis mechanism: under the condition of acidity or alkalinity, the degradation mode is catalyzed, and the degradation is the slowest in the neutral environment In natural seawater, which contains a variety of microorganisms, the hydrolysis half-life of sea nine is greatly accelerated According to the EPA test proposal (EPA, 1982), the half-life of sea nine is less than 24 hours Obviously, the hydrolysis (degradation) of sea nine is greatly accelerated in seawater, which is due to the great acceleration of microbial metabolism Photolysis mechanism: in natural seawater, the half-life of sea nine is 322h and 1913h under the condition of neutral pH value under natural light and no light, respectively Compared with the half-life of hydrolysis, the photodegradation rate of sea nine is slower than that of hydrolysis 5、 Effects on the environment: biological types, pollution types, characterization means, activity / × 106 Pseudomonas NAS Atlantic bacteria Mic (minimum effective inhibitory concentration) 0.1 Pseudomonas NAS Southern bacteria Mic (minimum effective inhibitory concentration) 0.1 amphora coffeaeformis diatom LD50 (half lethal dose) 0.003 entomorpha integrinalis algae LD50 (sprore generation) 0.002 balanus The development direction of Amphitrite larvae barnacle LD50 (spre germination) 0.34: isothiazolinone compounds are important industrial fungicides and marine antifouling agents In order to make these compounds get practical application, more attention should be paid in the future research, hoping to make further breakthroughs in the following three aspects: 1) It is necessary to study the composition, structure, toxicity, fate of isothiazolinone compounds and their effects on the environment The determination of reaction order and kinetic parameters (such as degradation rate and half-life) is the key to the quantitative evaluation of degradation reaction, so reaction kinetics is still one of the main research directions; 3) Further study on the toxic effects of isothiazolinone compounds on non target organisms, such as limited bioaccumulation and minimal toxicity to water fishes, provides theoretical basis for the selection of ideal fungicides 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,