A kind of drag reduction and antifouling coating composition and drag reduction and antifouling coating prepared therefrom

Abstract

The invention discloses a drag-reducing anti-fouling coating composition and a drag-reducing anti-fouling coating prepared therefrom. The composition comprises a first component, a second component and a third component. The first The component is a polymer emulsion polymerized from acrylic monomer and epoxy monomer, and the second component is composed of substituted acrylamide, amphiphilic macromer, crosslinking agent and epoxy monomer In the polymerized microgel suspension, the third component is a curing agent. The drag-reducing anti-fouling coating prepared by the above components has temperature sensitivity. Under the temperature change, the coating surface is in a dynamic shape, which prevents the adhesion of organisms and has anti-fouling properties. At the same time, the coating has amphiphilic It can effectively reduce the resistance in the water medium, and has the effect of reducing drag. The composition and the coating provided by the invention use water as a solvent during preparation, are safe, environmentally friendly, and pollution-free, and have readily available raw materials, simple preparation methods, and easy large-scale production and application.

Description

technical field [0001] The invention relates to the field of coatings, in particular to drag-reducing coatings, in particular to a drag-reducing and anti-fouling coating composition and a drag-reducing and anti-fouling coating prepared therefrom. Background technique [0002] The speed of underwater vehicles is mainly determined by navigation resistance and propulsion. However, increasing propulsion will increase energy consumption, reduce economy, and be unfavorable to the environment. Therefore, reducing navigation resistance becomes the key to increasing speed. In the resistance of underwater vehicles, frictional resistance accounts for the highest proportion, accounting for about 40% to 80% of the total resistance. Therefore, reducing frictional resistance and reducing marine biological pollution is of great significance for increasing navigation speed, saving fuel consumption, and protecting the environment. [0003] In the field of medicine, intubation and interventio...

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Problems solved by technology

The preparation process disclosed in this patent includes complex steps such as the reaction of reactants at a high temperature above 150°C. The process is complex, and a wide variety of chemical raw materials and reagents are required, and the formed coating will release organic volatiles under the washing of water flow, polluting the environment

[0007] Chinese patent CN201410161871.1 discloses a superhydrophobic coating composed of polyurethane, organic solvent, 3-aminopropyltriethoxysilane and polytetrafluoroethylene powder, etc., which achieves drag reduction effect by adsorbing tiny air bubbles on the surface, but in seawater The air bubbles adsorbed under immersion are difficult to attach stably for a long time, and the drag reduction effect is gradually lost after the pores are infiltrated by seawater

The coating composition of this method is complex, and surfactants such as stearic acid, fatty acid glycerides, silicone oil, and pigments such as sulfates, silicates, and carbonates are easy to migrate and pollute the marine environment.

[0009] Chinese patent CN201510216575.1 discloses an environmentally friendly anti-fouling and drag-reducing composite functional coating including cationic polyacrylamide, polydimethylsiloxane, xylene, acrylic resin or fluorocarbon resin, which has drag-reducing composite functional coatings in the short term Antifouling effect, but the components contain both hydrophilic components and hydrophobic components, and the combination method is simply blending without forming a chemical bond. During use, hydrophilic components such as polyacrylamide are easy to dissolve and fall off , lose the effect of drag reduction and antifouling

[0010] In summary, the existing drag reduction technologies are dominated by super-hydrophobic coatings and bionic coatings, in which the air bubbles adsorbed on the surface of super-hydrophobic coatings soaked in seawater are difficult to attach stably for a long time, which affects the effect of drag reduction; Prepared by complex processes such as plastic casting, embossing, and electrospinning, it is difficult to achieve large-area coating

In addition, although multi-component coatings can combine the advantages of each component to achieve drag reduction, the problem of migration and loss of effective components is difficult to solve; self-assembled coatings have poor stability and low efficiency, making it difficult to achieve large-scale coating

[0011] Therefore, the existing drag-reducing coating technology still has the following outstanding problems: (1) the process is complex and difficult to apply on a large scale; (2) the coating structure is unstable, the drag-reducing effect decays rapidly, and the drag-reducing effect is poor after long-term use; 3) The toxic and harmful components in the coating are easy to migrate to the water body and pollute the environment; (4) So far there is no bionic drag-reducing coating technology suitable for medical application and easy to implement on a large scale

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