Prepare And Study Polymer Mortar For Energy Saving System Of Buildings

In recent year, the situation of energy supply has become more and more serious in China and energy consumption for buildings takes a great part of energy consumption. Both implementing building energy savings and researching energy savings product of high performance are necessary. New polymer mortar for Building Heat Preservation System and phase change mortar were developed in this thesis.Expanded perlite modified by polymer was prepared by spraying. The water absorption ratio of the polymer-modified expanded perlite keeped under 20% in 30 min while the expanded perlite unmodified was nearly 100%. The intension of the expanded perlite had also been improved and the problem of frangibility was solved. Meanwhile the spraying technics was feasible to be applied in industry.The effects of expanded pertile, polymer latex, polypropylene fiber, cellulose ether and cement (the ratio cement to cement and fly ash) on polymer-mortar were studied and a new polymer-mortar was prepared. Results showed that compared to the former polymer-mortar, the new polymer-mortar showed good performances. For example, thermal conductivity was reduced from 0.108 W/(m·K) to 0.082 W/(m·K), ratio of compressive strength to flexural strength from 2.89 to 1.83, bond strength was 0.52 MPa and water preserving capability was excellent.The effects of polymer latex and polypropylene fiber on the polymer-mortar were studied. Results showed that ratio of compressive strength to flexural strength of anti-crack mortar reduced from 3.31 to 2.73 after increasing the content of polymer latex and using polypropylene fiber. Crack resistance was also improved.Phase change mortar was prepared by two-step means. First, phase change expanded pertile was prepared by the means of decompressing adsorption, and then phase change mortar was prepared with expandedpertile as aggregates. Results showed that the phase change material olefin was adsorbed into the expanded pertile and the maximal content of adsorption was near 200%. Both coating and emulsification could be successfully used to solve the leakage problem when content of olefin was high, and content of the olefin reached 100% without leakage by coating and 70% by emulsification. Emulsification was used to prepare aggregate for its relative low cost.Specific heat capacity and coefficient of heat accumulation of phase change board for energy saving prepared by phase change mortar was high and the thermal conductivity was low. Coefficient of heat accumulation of phase change board of 70% emulsification olefin was 60% higher than that without olefin, the thermal conductivity was 0.105(W/m·K) and when test temperature was between 20℃ and 30℃, specific heat capacity is 4 times more than that without olefin.Phase change box prepared with Phase change board showed excellent temperature-regulating capability and stability. The temperature in phase change mortar box with phase change mortar board has a fluctuation of 8.6 ℃ less than that without phase change mortar board. The phase change board was stable and didn't show any leakage after testing 400 cycles.