锌铋催化剂对聚氨酯砂浆内部温湿度变化规律的影响  

Effect of Zinc-bismuth Catalyst on Internal Temperature and Humidity of Polyurethane Mortar

作　　者：朱涵[1,2] 吴科晓 姜雯丽霞 邵建文 ZHU Han;WU Kexiao;JIANG Wenlixia;SHAO Jianwen(School of Civil Engineering,Tianjin University,Tianjin,China,300350;Coastal Civil Engineering Structure and Safety Key Laboratory of the Ministry of Education,Tianjin University,Tianjin,China,300072)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第3期469-477,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金青年科学基金项目(51708314)。

摘　　要：目的提升聚氨酯砂浆快速裂缝修补材料的力学强度及保温、耐老化性能。方法测量掺入锌铋复合延迟催化剂的聚氨酯砂浆在7d龄期内距试件上表面20mm、50mm、80mm处的温湿度变化。结合固化时间、抗折抗压强度及孔隙率研究催化剂对聚氨酯砂浆材料温湿度变化规律的影响。结果催化剂促进了聚氨酯砂浆固化反应进程,温度快速上升,高于环境温度7~15℃,并有效抑制了NCO与水反应产生CO_(2),孔隙率降低了62.29%。随龄期发展,试件内部温湿度演变机制与环境温湿度波动具有一致性。结论锌铋复合催化剂可降低聚氨酯砂浆孔隙率及内部温度的波动幅度,提升聚氨酯砂浆强度、保温抗渗性能,有利于其在裂缝修补工程中的应用。Heat preservation and aging resistance improve the mechanical properties of polyurethane(PU)-based polymer mortar used for early crack repair.This study investigates the internal temperature and humidity changes of polyurethane mortar incorporated with Zinc-Bismuth catalyst serve as a catalyst measured at 20 mm,50 mm,and 80 mm from the upper surface of the PU-based polymer specimen for 7 days curing time.Moreover,the flexural strength,compressive strength,and porosity analysis were conducted.The results showed that adding a Zinc-Bismuth catalyst enhances the curing reaction process of PU-based polymer mortar;the internal temperature rises rapidly higher than the ambient temperature of 7-15℃,which effectively inhibits the reaction of NCO water to produce CO_(2) in the PU mixture.This led to a reduction of porosity by 62.29%during the curing time of PU-based polymer mortar.The mechanism of internal temperature and humidity of PU mortar specimens are consistent with the environmental temperature and humidity changes.Zinc-Bismuth catalyst was capable of reducing the pore ratio and internal temperature changes;this led to the improved strength,heat preservation,and impermeability of PU-based polymer mortar desirable features for early repair of cracks.

关 键 词：聚氨酯砂浆 温度 湿度 锌铋催化剂 孔隙率 

分 类 号：TU578.12[建筑科学—建筑技术科学]