| The purpose of this study is to prepare a heat storage and thermal insulation interior latex,which contains multiple phase change composite materials.Under the national standards of interior wall paint(GB/T9756-2001),according to the effect of interior latex,research latex paint formulation and process parameter by orthogonal factor analysis and univariate analysis.(1)The preparation of ploy(N-hydroxymethyl acrylamide)/polyethylene glycol(PNHMPA/PEG)interpenetrating polymer network(IPN)phase change material heat storage and heat insulation paint.IPN thermal functional filler prepared by our own patented technology,we prepared IPN heat storage and thermal insulation paint by blending IPN thermal functional filler with styrene-acrylic emulsion matrix.Thermal properties of latex paints were tested by using differential scanning calorimetry(DSC)and thermogravimetric analysis(TGA).The dispersion degree of functional filler in latex paint and the apparent morphology of latex paint were researched by using scanning electron microscopy(SEM)and polarized optical microscopy(POM).And mechanical properties of coatings were studied by digital viscometer,washing resistance tester,coating pencil hardness instrument and electric adhesion tester.Viscosity test showed that the styrene acrylic emulsion system containing IPN filler was a non-Newtonian fluid,and as the IPN filler content increasing,thermo-regulated latex viscosity increase.POM showed that IPN particles were uniformly dispersed in the styrene acrylic emulsion;IPN filler appeared Black Cross extinction image,it manifested that IPN filler formed spherical crystal,and it had a good ability of phase transition.DSC analysis showed that the melting temperature of heat storage and thermal insulation paint was 44.51-59.58 ?;the melting enthalpy value was 9.21 J/g;crystallization temperature range was 30.77-36.44 ?,the crystallization enthalpy value was 13.17 J/g.TGA analysis showed that IPN filler had a good thermal stability,almost without mass loss under 350 ?.Thermal insulation performance test showed that heat storage and thermal insulation paint had an obviously regional platform,and phase transition temperature was 35 ?,platform time was about 150 s,which proved IPN filler heat storage and thermal insulation paint had a good performance of thermal insulation.Conventional performance coatings tests showed that the hardness was between B?2H;the adhesion was one-level;the coating surface presented smooth and no crack or damage of fish eyes;while it had a good washing resistance ability,good anti impact performance,and excellent flexibility.(2)The preparation of microencapsulated phase change/IPN filler complex type regenerative thermostat paint.A novel composite latex paint was prepared by composite technology successfully with two kinds of phase change material:IPN filler and commerce microencapsulated phase change material(MCPCM).Phase transformation temperature and phase transformation enthalpy of paint was selected by adjusting the mass ratio of IPN filler and MCPCM.Viscosity test indicated that composite binary regenerative thermostat paint was non-Newtonian fluid,with shear rate increasing,the variation of viscosity of latex paint which contained high level IPN filler changed significantly.POM showed that IPN and MCPCM particles uniformly dispersed in styrene-acrylic emulsion,SEM observation test showed that MCPCM particles could be uniformly dispersed in the coating.DSC analysis proved that the composite binary regenerative thermostat paint appeared two peaks in the process of melting phase transition,which represented melting peaks of MCPCM and IPN filler respectively.Phase transition temperature of the composite binary regenerative thermostat paint was 30?50 ?,which extended the phase change temperature range effectively,and melting enthalpy values was more than 15.84 J/g.TGA test showed that the two kinds of phase change materials had very good thermal stability and almost no loss at 180 ?.It showed that phase change materials in the processing temperature and operating temperature range with good thermal stability.Thermal insulation performance test showed that microencapsulated phase change/IPN filler complex type regenerative thermostat paint could prolong 50.58 min comparing with single-IPN heat storage and thermal insulation paint.Conventional performance coatings tests showed that the hardness was between B-2H;the adhesion was one-level,the coating had a smooth surface and no crack or damage of fish eyes,while it had a good washing resistance ability and good anti impact performance,which accorded with the standard coating performance.(3)The preparation of hollow glass microspheres/IPN filler composite heat storage and thermal insulation latex paint.A novel of heat storage and thermal insulation latex paint was prepared successfully,which improved thermo-regulated heat preservation function by compounding hollow glass microspheres and IPN filler.Conventional performance coatings test showed that the hardness was between B-2H;the adhesion was two-level;the coating showed smooth and no crack or damage of fish eyes;while it had a good washing resistance ability,which was accorded with the standard coating performance.DSC analysis showed that the addition of hollow glass beads had little effect on thermal heat storage capacity of latex paint;melting enthalpy was 8.55 J/g,crystallization enthalpy was 10.80 J/g.And phase change temperature range remains almost unchanged,which maintained at 32?55 ?.Thermogravimetric analysis proved hollow glass microspheres/IPN filler heat storage and thermal insulation latex paint at 350 ?also can keep thermal stability,which satisfied the need of coating processing.Apparatus for determining thermal conductivity showed heat conduction coefficient of the coating decreased as the addtion hollow glass beads,as the content of hollow glass microspheres arrived at 15 wt.%,the thermal conductivity decline slowly.By taking pictures from SEM of the fault surface coating,it could be found that hollow glass microspheres were uniformly dispersed in the coating. |
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