Study On Preparation And Performance Of Functionalized Carbon Nitride/Acrylic Fluoroboron Composite Antifouling Coating

The fouling of ships in the ocean has always been a problem that countries attach great importance to.The attachment of fouling organisms will seriously increase the loss of ships and cause huge economic losses.At present,the most used antifouling method is to apply antifouling coatings.Most antifouling coatings will release small organic molecules into the environment to kill bacteria,but these small organic molecules will pollute the environment.In order to solve this environmental problem,a large number of current studies focus on composite systems combining photocatalysts with self-polishing resins to provide synergistic antifouling effects.Therefore,in this paper,taking the photocatalytic material carbon nitride as the research object,four functionalized carbon nitride materials were prepared and composited with acrylic fluoroboron resin to prepare functionalized carbon nitride/acrylic fluoroboron composite antifouling coating.The antifouling performance of the composite antifouling coating was explored through antibacterial,anti-algal adhesion and real sea experiments.In this thesis,a simple calcination method is used to prepare a new type of three-dimensional C and O co-doped carbon nitride material(CNs)with N defects.The contact angle and weight loss data of the three-dimensional carbon nitride/acrylic fluoride boron composite antifouling coating(CNs/ABFP)show that the hydrolysis rate of the composite is significantly reduced,and its hydrolysis rate is 5.35%.The fluoroboron acrylic resin doped with Ct CN can inhibit Escherichia coli(E.coli)by 91.87%.The growth curve test of Nitzschia closterium shows that the modified composite antifouling coating has good environmental friendliness.The three-dimensional graphene-carbon nitride/acrylic fluoride boron composite antifouling coating(GCNs/ABFP)was successfully prepared,and the inhibition rates against E.coli,Staphylococcus aureus(S.aureus)and Halamphora sp.are 92.85%,93.89%and 90.35%.The real sea siding test also shows that the antifouling performance of the modified composite coating is significantly higher than that of the unmodified composite antifouling coating.The 14-day growth curve of Nitzschia closterium shows that the modified composite antifouling coating has good environmental friendliness and no affect on the growth of seaweed.The three-dimensional silver sulfide-carbon nitride/acrylic fluoride boron composite antifouling coating(ACNs/ABFP)was successfully prepared,and the weight loss rate after500 hours is only 6.59%.In addition,due to the photocatalytic effect of the material,the antifouling performance and anti-algae adhesion performance of the composite coating are significantly improved,and the antibacterial rate and the anti-adherence rate of Halamphora sp.reach 94.46% and 91.07%,respectively.The real sea siding test shows that the modified composite coating also has good antifouling performance in the actual marine environment.Three-dimensional zinc manganate-carbon nitride(ZMOCNs)composites were successfully prepared by hydrothermal and calcination methods.Ultraviolet spectroscopic tests show that when the mass fraction of zinc manganate is 70 wt%,the band gap of the composite is only 1.24 e V,which has a higher photocatalytic effect.The antibacterial rate and the adhesion inhibition rate of Halamphora sp.of the three-dimensional zinc manganate-carbon nitride/ABFP(ZMOCNs/ABFP)composite coating are 96.33% and96.60%,respectively.The environmental friendliness performance test shows that the ZMOCNs/ABFP composite antifouling coating has good environmental friendliness.