Polyurethane is enjoying a widespread use as a polymer-based waterproof material in civil engineering In the present study we consider a temperature-sensitive waterproof and moisture-permeable polyurethane material(PT...Polyurethane is enjoying a widespread use as a polymer-based waterproof material in civil engineering In the present study we consider a temperature-sensitive waterproof and moisture-permeable polyurethane material(PTPE-PU)characterized by one or more phase transition temperatures(critical temperatures).Near the critical temperature,the waterproof and moisture permeability of polyurethane undergo abrupt changes.The related stability,thermal performance,water resistance,hydrostatic pressure,and moisture permeability are investigated here considering a PTPE-PU traditionally used in bridge geotechnical engineering.The results show that the moisture permeability of the coated bridge rock and soil undergo sudden variations near the crystallization and melting temperature of the soft segment.The moisture permeability is 3000 g/(m^(2)d).The hydrostatic pressure of the coated bridge rock and soil is 3.5 kPa.展开更多
为得到环保且防水、防腐蚀性优越的聚氨酯防水涂料,以异氰酸酯为主要原料,制备新型单组分聚氨酯防水涂料,测定涂层渗水率,研究灰色聚氨酯面漆及其组合涂层的防水防腐蚀性能。结果表明:增加涂膜厚度可延长涂层渗水率达到饱和的时间,3层...为得到环保且防水、防腐蚀性优越的聚氨酯防水涂料,以异氰酸酯为主要原料,制备新型单组分聚氨酯防水涂料,测定涂层渗水率,研究灰色聚氨酯面漆及其组合涂层的防水防腐蚀性能。结果表明:增加涂膜厚度可延长涂层渗水率达到饱和的时间,3层涂层的渗水率最低为0.027 25%,当改良剂Hardener VP LS 2959质量分数为4%时,聚氨酯防水涂料性能最佳,可解决针孔、气泡、鼓包等问题。展开更多
基金Indoor hydrothermal experimental study on seepage drainage geogrid clay subgrade under temperature change(No.SQ21008).
文摘Polyurethane is enjoying a widespread use as a polymer-based waterproof material in civil engineering In the present study we consider a temperature-sensitive waterproof and moisture-permeable polyurethane material(PTPE-PU)characterized by one or more phase transition temperatures(critical temperatures).Near the critical temperature,the waterproof and moisture permeability of polyurethane undergo abrupt changes.The related stability,thermal performance,water resistance,hydrostatic pressure,and moisture permeability are investigated here considering a PTPE-PU traditionally used in bridge geotechnical engineering.The results show that the moisture permeability of the coated bridge rock and soil undergo sudden variations near the crystallization and melting temperature of the soft segment.The moisture permeability is 3000 g/(m^(2)d).The hydrostatic pressure of the coated bridge rock and soil is 3.5 kPa.
文摘为得到环保且防水、防腐蚀性优越的聚氨酯防水涂料,以异氰酸酯为主要原料,制备新型单组分聚氨酯防水涂料,测定涂层渗水率,研究灰色聚氨酯面漆及其组合涂层的防水防腐蚀性能。结果表明:增加涂膜厚度可延长涂层渗水率达到饱和的时间,3层涂层的渗水率最低为0.027 25%,当改良剂Hardener VP LS 2959质量分数为4%时,聚氨酯防水涂料性能最佳,可解决针孔、气泡、鼓包等问题。