Coating classification: environment friendly marine antifouling and environmental protection coating

Core tip: brief introduction: environmental friendly marine antifouling and environmental protection coating has the characteristics of environmental friendliness, so it is called environmental friendly marine antifouling and environmental protection coating Marine antifouling paint has a very long history According to whether it contains toxic antifouling agent and antifouling mechanism, it can be divided into traditional marine antifouling paint and environment-friendly marine antifouling environmental protection paint Although the traditional marine antifouling coatings play a certain role in antifouling, they also bring some toxic effects to the marine environment and marine organisms Early antifouling coatings used arsenic, mercury and other compounds as antifouling agents, which were washed out because of their toxicity Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Introduction: environmental friendly marine antifouling and environmental protection coating, with the characteristics of environmental friendliness, is called environmental friendly marine antifouling and environmental protection coating Marine antifouling paint has a very long history According to whether it contains toxic antifouling agent and antifouling mechanism, it can be divided into traditional marine antifouling paint and environment-friendly marine antifouling environmental protection paint Although the traditional marine antifouling coatings play a certain role in antifouling, they also bring some toxic effects to the marine environment and marine organisms Early antifouling coatings used arsenic, mercury and other compounds as antifouling agents, which were eliminated because of their toxicity Then it is the soluble antifouling coating with cuprous oxide as the antifouling agent base material, and then it develops to the insoluble (polymer as the main base material) antifouling coating with high copper compound content, organotin and organotin cuprous oxide composite antifouling coating, and then to the organic tin self polishing antifouling coating (SPC) with high performance, long-term effect and excellent construction performance, which makes the antifouling coating Technology is a big step forward Although SPC antifouling coating has the dual functions of antifouling and drag reduction, it is toxic due to the tin content and has serious marine pollution after release The results show that the sea water with organotin content higher than 0.1 × 10 will affect the marine ecological environment, seriously affect the growth and reproduction of marine organisms, and cause genetic variation of marine organisms With the increasing voice of environmental protection, many coastal countries have legislated to limit the use of organotin Therefore, it is the general trend to develop non-toxic anti pollution and environmental protection coatings to replace the traditional toxic anti pollution coatings, and the research on environment-friendly marine anti pollution and environmental protection coatings is becoming more and more popular Main categories: Table 2 environmental friendly marine antifouling environmental protection coating category main ingredients: Wuxi self polishing marine antifouling coating acrylate + organic acid copper (organic acid zinc, organic silane) low surface energy marine antifouling coating low surface energy material soluble silicate as antifouling agent marine antifouling coating soluble silicate bionic coating and natural antifouling agent Antifouling agent, which imitates "the natural antifouling structure of marine organism" or is directly extracted from natural organism, conductive coating contains conductive polymer 1 Wuxi self polishing marine antifouling coating The self polishing coating has the following characteristics: during the voyage of the ship, the coating becomes smooth due to the action of external forces; the continuous and stable release of biocides; the self polishing performance makes the ship also have antifouling performance during the static period The design of Wuxi self polishing coating basically follows the technical route of tbt-spc most of the base materials used are acrylic copolymers, but the difference is that tin in the copolymers is replaced by other metals such as copper, zinc and silicon The self polishing antifouling coating is generally a metal salt of acrylic acid or a silane acrylic polymer, which belongs to the ion-exchange coating The coating releases metal ions through the ion-exchange function in the sea water to have the antifouling effect, that is, it exchanges with the sodium ion in the sea water to make the polymer dissolve and the antifouling agent release, which has an excellent self polishing effect The effect of self polishing coating in static sea water is relatively small due to the scouring effect of sea water, and the renewal effect is poor; the effect of self polishing coating is better for ships sailing, and the higher the speed is, the better the effect of self polishing is At present, self polishing antifouling coatings are mostly used in large ocean going freighters Wuxi self polishing coating is one of the most effective antifouling coatings Many products have been used in ships and related facilities 2 The antifouling coatings containing toxic antifouling agents with low surface energy can only inhibit some marine organisms, but with the release of toxic substances, the antifouling effect will not gradually decrease The low surface energy antifouling coating is based on the physical function of the coating surface, there is no release of toxic substances, which can play a long-term antifouling role Because of its low surface energy, it is difficult for marine organisms to adhere to it Even if the adhesion is not firm, it is easy to fall off under the action of water flow or other external forces Therefore, the low surface energy antifouling coating can prevent the adhesion of various marine organisms At present, the low surface energy antifouling coatings are mainly divided into organosilicon series and fluoride series Fluoride is the lowest surface energy material The results show that the surface energy of these resins can be reduced to less than 6 m n / m when (CH2) 2 - (CF2) n-f is added to perfluoroacrylate and perfluoroacrylate resins, where n > 10 The simple low surface energy coating can only make the marine organisms not firmly attached, and it needs to be cleaned regularly Once the attached organisms grow up, they will be difficult to remove, and the cleaning process will damage the paint film Therefore, it is generally used on high-speed ships, and it is not recommended for large ships that are difficult to clean regularly in the dock 3 The neutral or slightly alkaline environment of marine antifouling coating with silicate as antifouling agent is more suitable for the growth of marine organisms, but it is difficult to survive under the condition of strong acid or strong alkali Silicate antifouling coating is a kind of antifouling agent based on soluble silicate, which can form a long-term stable high alkaline coating on the hull surface to achieve the purpose of antifouling The soluble solid silicate was prepared by the reaction of liquid silicate with curing agent, zinc powder and other additives According to the formulation principle of self polishing resin, the coating on the alkaline surface can be continuously updated However, there are few examples of silicate antifouling coatings, and some problems encountered in the use process need further research and improvement, so it is possible to be popularized 4 Biomimetic coatings and natural antifouling agents some marine organisms have the characteristics of natural anti biological attachment, such as dolphins, whales, sponges, etc the research shows that they can inhibit the attachment of marine organisms to their epidermis by secreting a special chemical substance or special structure Some researchers extract alkaloids from seaweeds, peptide compounds from sponges, and then add them to resins to make bionic coatings, which can achieve certain antifouling effect Active substances can be extracted from many plants as antifouling agents, such as capsaicin extracted from pepper, pepper and other plants, which can inhibit bacterial and biological adhesion However, due to the small amount of these substances extracted from organisms, it is difficult to be widely used People's understanding of the biological characteristics, through other scientific methods to develop and promote the application of bionic coatings Marine organisms first secrete a kind of mucus on the surface of the object, which is wetted and dispersed on it, and then adhere to the surface of the object or organism through the mechanism of chemical bonding, electrostatic action, mechanical crosslinking and diffusion The research of biomimetic coating mainly focuses on the mechanism of biological adhesion On the one hand, it looks for suitable polymer materials to imitate the skin state of some organisms, so that the coating has a special surface structure; on the other hand, it looks for effective antifouling agent, which has high-efficiency antifouling performance without breaking the environment 5 After the conductive coating is applied on the ship, the seawater is electrolyzed by small current to produce sodium hypochlorite, so as to achieve the purpose of anti pollution This anti pollution method is economic and effective when combined with electrochemistry However, the technology of this kind of coating is very difficult The resin, filler, curing agent and so on need to be further studied to improve the service life and antifouling effect of the coating Another method is to prepare antifouling coating for steel plate with conductive polymer material doped with polymer compound as effective component 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,