Research Of The Preparation And Performance Of The Thermal Insulation Paint

Inorganic thermal insulation paint which taking inorganic adhesive as basicmaterial and epoxy resin thermal insulation paint which taking epoxy resin as basicmaterial were prepared with thermal insulation aggregates and inorganic mineral fillersas main components and reinforced fibers and curing agent as additives, the paints aremainly used for the thermal protection of internal and external surfaces of ammunition,coating agent of artillery ammunition column, heat protection of engine combustor linerand facilities on the ground, also can be applied to the heat insulation protection ofpetroleum and chemical heat pipe, engine cylinder of transportation and exhaust pipe,etc. the effects of curing agent, fibers and dispersant on the performances of paint withtaking inorganic adhesive as basic material, and single aggregate or filler, compositeaggregates and fillers on thermal conductivity coefficient were studied and the optimalratio was determined. the effects of filler content, curing agent content and temperatureon the performances of paint with taking epoxy resin (E44) as basic material werestudied and the optimal ratio was determined. The isothermal curing reaction process ofpaint was studied by differential scanning calorimeter method (DSC); the curingreaction mechanism of paint was ascertained by dynamic increasing temperature DSCmethod and IR spectrogram (FTIR) method.The results show that: in inorganic thermal insulation paint, when addingcomposite aggregates and fillers compared with adding a single aggregate or filler, thethermal insulation performance of paint was better. When volume ratio of aggregate andfiller was3:5, the thermal insulation performance of paint was best. The optimalformula of paint was: inorganic adhesive,65%, ceramic fibers,6.5%, aggregates andfillers,20%, sodium fluosilicate curing agent,1.3%, additives,7%.In epoxy resin thermal insulation paint, the optimal formula was: epoxy resin,54%, inorganic composite fillers,27%, curing agent (T31),10.8%, additives,8.2%. Kamalmodel can describe curing kinetics of the paint, the total reaction orders increase from1.30to2.14. The two rate constants increase with increasing temperature, the activationenergies are90.583kJ/mol and68.373kJ/mol, and pre-exponential factors are6.521×1015s-1and6.381×109s-1. The curing reaction dynamic equation isd dt [6.5211015exp(10895.261/T)+6.381109exp8223.875/T0.385](1)1.410.Thecuring reaction of paint in two steps, the first step is the addition reaction of epoxygroup and primary amine or secondary amine; The second step is the etherificationreaction of epoxy group and phenolic hydroxyl or alcoholic hydroxyl.The SEM analysis results show that surface of coating was compact, internalstructure was porous layer and reticular. The porosity of coating was high, which hadgood heat insulation effect.The performance test results of paint show that: the initial viscosity of paints wasabout300Pa·s, the adhesion level of paints was1~2, the micro-hardness approximated150HV. The thermal conductivity coefficients of paints were in the range of0.078to0.162W/(m·K).