Moisture-curable polyurethane antifouling coating for fishing nets, and preparation method thereof

Abstract

The invention relates to the technical field of chemical materials, and especially relates to a moisture-curable polyurethane antifouling coating for fishing nets, and a preparation method thereof. The moisture-curable polyurethane antifouling coating for fishing nets comprises isocyanate-terminated polyester resin, an antifouling agent, a composite porous filler, a pigment and a solvent. Comparedwith like products in the prior art, the moisture-curable polyurethane antifouling coating for fishing nets has the following advantages: 1, the coating can permeate into gaps in the fishing nets andis cured into a film by absorbing moisture, and a film formed by the coating has good flexibility and good matching property with nettings, and is not prone to falling off in the use process; 2, thefilm formed by the coating can be slowly hydrolyzed, and the antifouling agent in the film can slowly seep out, so that the film has a good and lasting antifouling effect; and 3, a coating substrate and the antifouling agent are degradable, so the coating has the characteristics of no residues, no influences on subsequent maintenance or coating, no pollution to the marine environment, low volatilesolvent content, high solid content and environmental protection.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a moisture-cured polyurethane antifouling coating for fishing nets and a preparation method thereof. Background technique [0002] With the depletion of my country's coastal marine fishery resources, fish farming has achieved rapid development. The problem of biofouling on the surface of fish farming facilities has become increasingly prominent and is a worldwide problem. A large number of marine fouling organisms attach to the breeding nets, block the mesh, hinder the exchange of water and nutrients, and reduce the dissolved oxygen and water quality in the water in the breeding facilities, resulting in frequent diseases and endangering the growth and quality of the cultured species. A large number of attached fouling organisms greatly increase the weight of the net, increase the impact of the net on the water flow, aggravate its drift and wear, shorten its service li...

AI Technical Summary

Problems solved by technology

[0008] The above antifouling coatings all use non-hydrolyzable high molecular polymers as the matrix resin. Since the matrix resin is insoluble in seawater, after the antifouling agent on the coating surface seeps out, the residual resin skeleton will inhibit the antifouling agent inside the coating from seeping out, which is easy Lead to antifouling failure; after the antifouling coating fails, the resin skeleton remaining on the fishing net is not easy to remove, which increases the difficulty and workload of cleaning the fishing net

In addition, if this kind of resin is used as the matrix resin of antifouling coating, due to the large molecular weight of the resin, a large amount of organic solvent needs to be added to dissolve the resin. The antifouling coating prepared by it has low solid content of the coating, VOC as high as 400g / L or more, and poor environmental protection.

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