Study On Preparation And Antifouling Performance Of Silicide Modified Organic Silicon Coating

Marine biofouling is a pressing problem where marine organisms attach to ship hulls and other man-made underwater surfaces in a short period of time,thus causing serious economic losses and environmental pollution.The current common method to solve marine biofouling is to apply antifouling coatings on various man-made surfaces.Most antifouling coatings achieve the purpose of antifouling by releasing heavy metals or other harmful antifouling agents to poison the fouling organisms,and such coatings can cause environmental pollution.Therefore,the development of new environmentally friendly antifouling coatings has become a research direction.In this paper,polydimethylsiloxane(PDMS)was modified by surface modification,doping with fluorocarbon resin and infusion of lubricant,and addition of epoxy polyether silicone oil to prepare surface amphiphilic PDMS,fluorinated superslip PDMS,and amphiphilic PDMS.The antifouling performance of the materials was evaluated by laboratory and sea environment tests,and the effects of surface morphology and wettability of the materials on antifouling performance were studied by contrast experiments.PDMS were modified with amino siloxane to prepare hydroxy-end side chain amino polydimethylsiloxane resin(NPDMS),which reacted with epoxy curing agent to prepare high crosslinking degree silicone coating(NPDMS-x K).The surface amphozionized silicone coating(NPDMS-x K-B)was prepared by soaking in 1,3-propane sulfonolactone solution.Surface morphology,wettability and stability of amphoteric coatings were analyzed by AFM,contact angle and thermogravimetry.It was found that the surface roughness of the coating increased and the hydrophilicity increased after grafting zwitterion.Compared with PDMS,on the NPDMS-20K-B surface adhesion inhibition rates of Halamphora sp and N.closterium.were 93.3% and 94.2%,respectively.The antibacterial,anti-mussel and solid sea tests of the coating were good and environmentally friendly.The zwitterion on the surface of the coating can react with water to produce a hydrated layer,making it difficult for fouling organisms to replace water molecules on its surface for adhesion,thus the zwitterionic coating has a good anti-fouling effect.The fluorocarbon resin modified silicone resin was prepared by grafting amphoteric ions onto the side chain of the terminal hydroxyl side chain amino silicone resin and then doping with fluorocarbon resin.The surface containing dimethyl silicone oil and perfluoropolyether lubricant super-slip coatings were prepared by the solubilization method and physical blending method,respectively.It is found that the supersmooth coating has good hydrophobicity and stability,and has good storage capacity for lubricating oil.The laboratory experiments of anti-diatom,anti-bacterial and anti-mussel adhesion showed that the lubricating oil layer on the surface of the material could improve the anti-fouling performance,and the super-slippery coating with dimethylsilicone oil added in the laboratory environment had better anti-fouling performance.Compared with PDMS,the material blended with dimethylsilicone oil had an inhibition rate of Halamphora sp over80%.The anti-mussel test results are good and environmentally friendly.However,the coating blended with perfluorinated polyether lubricating oil has better antifouling performance in the actual marine environment.The lubricant layer on the coating surface is able to repel various immiscible liquids and solids,thus providing good anti-fouling properties making it difficult for fouling organisms to adhere to the coating surface.Epoxy polyether silicone oil was added into PDMS as amphiphilic additive to prepare amphiphilic silicone coating.In order to reduce the release of epoxy polyether silicone oil,silicone oil with hydroxy-side chain amino was added to make it better combined with PDMS.The release of epoxy polyether silicone oil can be effectively reduced by adding amino silicone oil.The introduction of polyether hydrophilic chain segments enhanced the antifouling and fouling release properties of the coating.The anti-bacterial rate of 92% and anti-algae rate of 97.9%,as well as the ability to effectively prevent the attachment of mussels,indicate that the amphiphilic coating has excellent anti-biofouling ability and good environmental friendliness.The good antifouling properties of the coating are attributed to the presence of polyether chain segments,which make it difficult for fouling organisms to replace the coating surface with a hydrated layer due to the strong hydration ability of polyethers.