| Based on the researches and applications of antiseptic,cooling,energy saving coatings used in arming,petrochemical industry and urban construction,some novel functional materials ware used to obtain a kind of camouflage color infrared heat shielding coating of water-based epoxy-modified acrylic acid by utilizing multidisciplinary knowledge such as material science,organic chemistry,inorganic chemistry,physic chemistry,optics and calorifics etc.and absorbing advanced research experience at home and abroad.The film forming matter of water-based epoxy-acrylic ester hybrid emulsion was fist prepared by semicontinuous seed emulsion polymerization for the infrared heat shielding coating.The test results showed that the addition order of epoxy resin directly influenced the properties of emulsion,optimum of which was obtained by the following process:the monomers of acrylic acid and styrene were gradually added in the first step and epoxy resin was added in the second step.The particle size was reduced with the increase of hybrid emulsifier content while it increased as the increase of initiator and epoxy resin content.The optimum seed emulsion content,stirring speed and polymerization temperature respectively was 20-30%, 180rpm and 80℃,by which an emulsion with low VOC,fast dry speed,high hardness and good corrosion resistance was obtained.The graft reaction between epoxy resin and acrylic acid-styrene was proved by FT-IR,GPC,UV-Vis tests.TEM results showed that pH1.5 PTA could dye epoxy resin after the latex particles of MMA/EP,EP/MMA and epoxy-acrylic acid with different epoxy resin content were dyed by pH1.5 PTA.The latex particles of epoxy-acrylic acid presented a structure of acrylic acid as the core and epoxy resin as the shell,where the acrylic acid core located in the epoxy resin shell as central ball or eccentric ball.The emulsion of epoxy-acrylic acid with ketene group polymerized with DAAM was prepared first,ADH was then added and a water-based emulsion cross linked at room temperature was obtained.FTIR and TEM showed that crosslink reaction occurred between ketone group and hydrazine during emulsion forming film.The optimum reaction condition for ketone and hydrazine was slightly acidic or alkaline,which was proved by FTIR based on the simulation of emulsion solidifying.Several kinds of emulsion with various glass transition temperatures were prepared based on the investigation for the effect factors of emulsion properties and technique conditions.The hybrid emulsion with Tg of 10.6℃was used to be the film forming matter for infrared heat shielding coating.Its physical and chemical properties all met the requirements of infrared heat shielding coating.The heat reflective,thermal emission,heat insulation and photocatalytic cooling mechanism were investigated with purpose of effective cooling,friendly environment and excellent property/cost ratio.The coating structure of heat shielding coating was designed.A kind of bottom coating with thermal conductivity of 0.114w/m.k and good heat insulation and corrosion resistance was obtained by investigating and characterizing the heat insulation property and coating microstructure.The relationship between cooling properties and coating was explored by investigating the effect of sort,shape,size,particle distribution and ratio in matrix of pigment fillers on the reflectivity and emissivity of coatings.The cooling effect of dark or camouflage color coatings and the reflectivity of various color pigments were tested to establish a data bank,from which a good reflective material was chosen and a serial of face coatings with radiance of 93%and camel gray reflectivity of 80%,army green reflectivity of 72%and dark green reflectivity of 68%were obtained.This could be a good reference for further research.A kind of heat shielding coating of camouflage color water-based epoxy-modified acrylic acid was prepared based on the investigation of heat reflectivity,heat radiance,heat insulation and photocatalytic cooling mechanism and their cooperative action and the simulation of the real application.This coating could cool down 5-10℃for the inner temperature and 12-15℃for the exterior temperature of the coated substance. |
PDF Full Text Request