Research On Anti-explosion Performance Of Polyurea Coating And Its Coated Explosion-proof Tank

Explosion-proof tanks are one of the main safety protection measures for properly handling explosives in public places.Improving the anti-explosion ability of explosion-proof tanks has always been the focus of attention at home and abroad.In recent years,coating protection to improve the anti-explosion performance of explosion-proof tanks has become the focus of research.In this paper,spraying polyurea elastomer material is selected as the protection material of the explosion-proof tank.Firstly,the basic performance,thermal stability,flame retardancy and mechanical properties under high strain rate of Qtech MS-1 sprayed high-strength polyurea material(hereinafter referred to as MS-1 polyurea material)and modified viscoelastic damping Qtech Q413m type polyurea material(hereinafter referred to as Q413m polyurea material)are analyzed.Then,through numerical simulation of polyurea-coated explosion-proof tanks,the effect of two polyurea coatings with different properties on the anti-explosion protection performance of explosion-proof tanks was studied and analyzed.On this basis,actual explosion experiments of polyurea-coated explosion-proof tanks were carried out to verify the accuracy of numerical simulation.Finally,on the basis of single-layer polyurea coating anti-explosion,the anti-explosion protection performance of MS-1 and Q413m polyurea material composite coating structure is studied,and the radial deformation displacement and shaping of the tank body after explosion are studied.The stress and energy absorption characteristics are compared and analyzed,and the optimal coating mix ratio of the composite coating structure is obtained.Through the above-mentioned test methods and numerical simulation research,the main research conclusions of this paper include the following aspects:(1)The conventional performance research results of MS-1 type polyurea material and Q413m type polyurea material show that the density,hardness,tensile strength,elongation at break and tear strength of the above-mentioned materials are 1.157g/cm~3 and0.893g/cm~3,90HA and 61HA,24.35MPa and 12.34MPa,294.28%and 362.03%,77.3k N/m and 32.47k N/m respectively;The average gel time is 5s,41s,and the surface drying time is 31s,222s,respectively;The solid content is 97.73%,95.94%,the volatile content is only 2.27%and 4.06%and the surface adhesion is 6.07MPa,2.36MPa,respectively.Therefore,MS-1 type polyurea materials and Q413m type polyurea materials have the characteristics of light weight,high strength,fast construction speed,environmental protection,and good adhesion,etc.,and are suitable as substrate protective coatings.(2)The thermal stability and combustion-supporting performance of MS-1 polyurea material and Q413m polyurea material show that the temperature at 5% weight loss is 273.9? and 293.7?,respectively,indicating that the polyurea material can work safely in an environment with a temperature below 270°C.Its oxygen index is 22.7 and 22.3respectively,indicating that it is not a flammable material and meets the flame retardant requirements as a protective coating.The maximum smoke density(MSD)is 9.09%and8.59%,and the smoke density rating(SDR)is 5.26%and 1.99%,respectively.Compared with traditional materials,the amount of smoke generated during the combustion process is lower,and the flame retardant performance is excellent.(3)ANSYS/LS-DYNA finite element simulation of anti-explosion performance of a single polyurea-coated explosion-proof tank shows that in terms of radial deformation,the minimum deformation of the MS-1 type polyurea explosion-proof tank is 6.33mm,which is 23.55%less than that of uncoated explosion-proof tanks;In terms of plastic stress,the peak value of plastic stress is about 43MPa,and the stress is reduced by 20.41%.In terms of energy absorption,the MS-1 type polyurea explosion-proof tank absorbs the most internal energy,which is 62.7J,and the kinetic energy is 57.9%less than that of the uncoated explosion-proof tank.A comparative study between a single MS-1 polyurea material and Q413m polyurea material tank and an uncoated tank shows that a single MS-1polyurea material explosion-proof tank is the best in terms of overall deformation,reduction of plastic stress and energy absorption.(4)Experimental research on actual explosion of polyurea-coated explosion-proof tank under explosive impact load(field explosion)shows that the deformation effect diagram is basically similar to the numerical simulation cloud diagram.The maximum radial deformation of uncoated,4mm Q413m and 4mm MS-1 polyurea tanks is 7.7mm,6.6mm,and 5.8mm.The errors between the field explosion experiment results and the numerical simulation results are all below 11%,which indicates that the results of the field explosion experiment and the simulation research are in good agreement.(5)The ANSYS/LS-DYNA finite element simulation results of the polyurea composite coating structure explosion-proof tank show that:in terms of restrained deformation,the deformation of 1mm Q413m polyurea material and 3mm MS-1 polyurea material composite coating tank is 7.4mm,which is 10.63%higher than the overall protection effect of uncoated tanks,and the deformation performance of the tanks is the optimal coating mix ratio;in terms of reducing plastic stress and energy absorption,1mm Q413m polyurea material,1mm MS-1 type Polyurea material,1mm Q413m type polyurea material and 1mm MS-1 type polyurea material composite coating are the optimal anti-explosive protective coating ratio.In summary,the polyurea coating used for explosion-proof tanks has a good anti-explosion protection effect and has a good application prospect in the field of anti-explosion protection.