双组分改性聚氨酯水工防腐涂层性能研究

采用柔性材料防护水利过流部件解决其运行过程中气蚀、磨蚀及其联合作用导致的破坏问题。以化学改性的方式在聚氨酯侧链上引入氟碳链及疏水性基团,合成兼具聚氨酯弹性体、氟碳化合物双组分性能的涂层材料。通过对涂层制备过程中喷涂压力、温度等喷涂工艺参数优化制备性能最佳涂层。对材料进行疏水性、冲蚀磨损、人工老化等测试,采用扫描电镜对涂层微观形貌进行观察,分析磨蚀机理对涂层性能及防护效果影响。结果表明:所制备涂层可有效提升过流部件的防腐耐磨性能。

新型双组分氟改性抗冰拔面漆的研发及应用

文章简述了一种新型双组分氟改性聚脲材料在水利水电工程中的应用,采用氟改性脂环族慢反应仲胺基树脂做为新型聚脲体系的A组分,B组分为聚酯多元醇与脂肪族多异氰酸酯反应制成的预聚体。由于引入的氟元素电负性大,F-C键能高,低表面能等多种特性,通过特殊配方设计,成功开发了一种适用于水利水电工程应用要求的新型氟改性慢反应型聚脲抗冰拔面漆。该材料具有非常优异的耐老化性能,憎水性能强,低温柔韧性好,抗冲磨性能好,附着力强,可低温固化,受外界温湿度影响小,非常适用于水工建筑物的各类表面防护处理,在水利水电工程中具有广泛的应用前景。

珠三角城际轨道交通穗莞深2标太平隧道堵漏施工技术

珠三角城际轨道交通穗莞深2标太平隧道改扩挖施工中,暗挖隧道二衬围岩混凝土出现一定程度的渗漏,结合工程现场情况,对渗漏部位进行分析后,选用了化学灌浆材料对渗漏部位进行高压注浆,较好解决了暗挖施工中的防水难题。

Synthesis of Phenolic Resin Blended Castor Oil Based Modified Polyol for Two Component Polyurethane Coating

Castor oil is used to synthesize phenolic resin modified polyol. Castor oil, phenolic resin were taken in the molar ratio 0.07：0.027 and diethylene glycol （DEG） was also taken in varying hydroxyl numbers to achieve chemical modification in the backbone of synthesized polyol. Physico-chemical properties like acid value, OH value and moisture content of the modified polyol were measured. The prepared phenolic resin blended polyol were reacted with 4, 4-methylene diisocyanate and 2, 4-toluene diisocyanate to formulate the two component polyurethane （PU） coatings. Prepared coating is used to study properties such as gel time, surface dry, tack free and hard surface drying times. It was found that phenolic resin and diethyleneglycol used in synthesizing castor oil based modified polyols show the significant changes in physico-chemical properties of synthesized polyols. The variation in physico-chemical properties of synthesized polyol provide the information for desirable curing of polyurethane systems.