化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
5期
1242-1246,1295
,共6页
多孔介质%烷烃%相变材料%定形相变材料%相变砂浆%热力学性质
多孔介質%烷烴%相變材料%定形相變材料%相變砂漿%熱力學性質
다공개질%완경%상변재료%정형상변재료%상변사장%열역학성질
porous media%alkane%phase change materials%shape-stabilized phase change materials%phase change mortar%thermodynamic properties
以十八烷为相变材料，膨胀珍珠岩为支撑材料，采用浸泡吸附工艺制备定形相变材料。通过DSC、FT-IR、ESEM等测试技术对相变材料及定形相变材料进行表征。为减少在水泥基质中使用时相变材料融化泄漏，本文尝试采用湿裹水泥干粉工艺对该定形相变材料进行表面封装，在60℃下连续烘烤20h，封装前后十八烷在膨胀珍珠岩中的容留率由75%提高到97%以上。隔热性能测试结果表明：以封装后的定形相变材料等质量取代水泥砂浆中40%砂，与基准砂浆板相比，10mm和15mm厚度砂浆板下表面时间延迟和最大温差分别为230s、4.2℃和500s、6.2℃。经历25次冷热循环的相变砂浆，15mm厚度砂浆板下表面时间延迟仍有360s，最大温差4.3℃。
以十八烷為相變材料，膨脹珍珠巖為支撐材料，採用浸泡吸附工藝製備定形相變材料。通過DSC、FT-IR、ESEM等測試技術對相變材料及定形相變材料進行錶徵。為減少在水泥基質中使用時相變材料融化洩漏，本文嘗試採用濕裹水泥榦粉工藝對該定形相變材料進行錶麵封裝，在60℃下連續烘烤20h，封裝前後十八烷在膨脹珍珠巖中的容留率由75%提高到97%以上。隔熱性能測試結果錶明：以封裝後的定形相變材料等質量取代水泥砂漿中40%砂，與基準砂漿闆相比，10mm和15mm厚度砂漿闆下錶麵時間延遲和最大溫差分彆為230s、4.2℃和500s、6.2℃。經歷25次冷熱循環的相變砂漿，15mm厚度砂漿闆下錶麵時間延遲仍有360s，最大溫差4.3℃。
이십팔완위상변재료，팽창진주암위지탱재료，채용침포흡부공예제비정형상변재료。통과DSC、FT-IR、ESEM등측시기술대상변재료급정형상변재료진행표정。위감소재수니기질중사용시상변재료융화설루，본문상시채용습과수니간분공예대해정형상변재료진행표면봉장，재60℃하련속홍고20h，봉장전후십팔완재팽창진주암중적용류솔유75%제고도97%이상。격열성능측시결과표명：이봉장후적정형상변재료등질량취대수니사장중40%사，여기준사장판상비，10mm화15mm후도사장판하표면시간연지화최대온차분별위230s、4.2℃화500s、6.2℃。경력25차랭열순배적상변사장，15mm후도사장판하표면시간연지잉유360s，최대온차4.3℃。
A kind of shape-stabilized phase change materials(SPCMs) was prepared by soaking absorbing technology with octadecane as phase change materials(PCMs) and expanded perlite as supportive material. The PCMs and SPCMs were characterized by DSC,FT-IR and ESEM. The surface of the SPCMs were packaged tentatively by the technology of wet-wrapping cement dry powder in order to reduce the possibility of melting leakage of PCMs in the cement matrix. The holding ratio of the octadecane absorbed in expanded perlite increased from 75 percent to above 97 percent after surface packaging SPCMs which were baked under 60℃ for continuous 20 hours. The heat-insulating property experiment results show that the lower surface time delay and the maximum temperature difference are 230 s,4.2℃ and 500s,6.2℃ respectively for 10mm thickness and 15mm thickness mortar board with 40 percent by weight of sand in the reference mortar mixture replaced by packaged SPCMs,compared to those of same thickness reference mortar board the form-stable phase change materials wrapped by cement,baked for 20 hours under 60℃,and absorption rate changes from 75%to 97% after packing. The lower surface time delay and the maximum temperature difference of 15mm thickness phase change mortar board still have 360s and 4.3℃ after experiencing 25 thermocycling.
