Preparation And Characterization Of Water-based Epoxy Resin-based Offshore Platform Steel Structure Intumescent Fireproof Coating

The steel structure offshore platform is used for collecting oil and natural gas in the ocean.The formation of fire is mainly caused by blowout.In the marine environment,it is more difficult to escape from the fire.Although the steel structure is a non-combustible material,the strength modulus has a great relationship with the temperature due to the large thermal conductivity of the steel structure.When the temperature reaches 600?,the strength of the steel structure is completely lost,losing support,causing great safety problems and economic losses.Therefore,extending the time when the steel structure reaches the critical temperature and reducing the spread rate of the open flame can provide more time for rescue.The water-based ultra-thin fire-retardant coating has the advantages of environmental protection and high efficiency.When the coating thickness is 2mm,it can form an expanded carbon layer with a thickness of 40-5 0mm in the event of fire,which has good heat insulation and slows down fire spread.Therefore,the application of water-based ultra-thin fire-retardant coating on the surface of steel structure has positive significance for the protection of steel structure.Since the coating is applied to the marine environment,the fireproof coating should have good water resistance.In this study,water-based epoxy emulsion(EP)was used as the film-forming substrate,and APP/MEL/PER was used as the intumescent flame retardant to find the optimum formulation ratio.By adding a high temperature resistant inorganic filler ZrN,it forms a synergistic effect with the intumescent flame retardant to improve the fire retardant performance.Due to the poor water resistance of APP and PER in the intumescent flame retardant,the surface modification was used to improve the water resistance of APP and PER,thereby improving the water resistance of the coating and maintaining good fire retardant performance after immersion in water.The main work are as follows:1.We selected the intumescent flame retardant APP,PER,MEL as the influencing factors,and choose different levels for orthogonal experiment.The orthogonal results of the carbon residue expansion height and the ultimate fire time were analyzed,and the best influencing factors and excellent levels were obtained.After orthogonal analysis,the factors affecting the expansion height of carbon layer were APP,MEL and PER.The order of factors affecting the ultimate burning time were APP,PER,MEL.APP as the catalyst in the expansion system was the most important factor;MEL as a gas source generates a large amount of gas,so the effect on the expansion of the carbon layer is higher than the effect of PER.The ultimate flame resistance time was related to the overall carbon layer,and PER was a carbon source,which is related to carbon formation,so the effect on the ultimate flame resistance time is greater than the effect of MEL.The optimum addition amount of the intumescent flame retardant APP/MEL/PER was obtained,and the formulation of each component was determined.2.Zirconium nitride was added as inorganic filler to the intumescent fireproof coating with APP/MEL/PER as the intumescent flame retardant,and the effect of the addition amount on the fire resistance of the coating was investigated.Through the small plate combustion method and TGA analysis,when the addition amount of ZrN was 3%,the best ultimate flame resistance time is about 61 min,and the residual carbon content was the highest,and the thermal stability of the coating increases with the increase of ZrN content.Through the Cone test,THR decreased by 20.3%and TSP decreased by 40.0%.The carbon residue was subsequently observed by SEM,and the carbon residue was more dense after adding 3%ZrN.Combined with Raman spectroscopy and XRD analysis,it is found that ZrP2O7 and Ti0.8Zr0.2P2O7 solid solution are formed after the addition of zirconium nitride at high temperature,thereby improving the strength of the carbon residue and making the carbon residue have better thermal stability.The later insulation is better.3.Epoxy resin coated APP(EPAPP)was prepared by in-situ polymerization method,and pentaerythritol C9 maleic anhydride copolymer microsphere ester(PER-C9-MAH)was obtained by esterification reaction.It was characterized by FTIR,TGA and SEM,and EPAPP and PER-C9-MAH were successfully prepared.And its hydrophobicity was tested by contact angle test.The addition of EPAPP and PER-C9-MAH to the coating significantly improved the water resistance of the coating.After soaking in distilled water and 5g/L brine for 48 h,the coating did not show blistering and falling off,and the weight loss rate of the coating was separately reduced to 0.210%and 0.275%.The coating after soaking water was subjected to small-plate burning test,and the coating still maintained good fireproof performance,and the carbon layer expanded to a good extent.Raman spectroscopy and TGA analysis showed that the addition of PER-C9-MAH microspheres increased the degree of graphitization of the carbon layer,increased the strength of the carbon layer,and improved the thermal stability.