汽车玻璃油墨用无铅低熔点玻璃的研究与制备

Research and Preparation of Lead-Free Low-Melting Point Glass for Automobile Glass Enamel

采用高温熔融法制备了R_(2)O-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)系无铅低熔点玻璃,并将其应用于汽车玻璃油墨,重点研究了组成对玻璃结构、热学性能和耐酸性能的影响规律。结果表明,随着Bi_(2)O_(3)/B_(2)O_(3)和Bi_(2)O_(3)/SiO_(2)的增加,[BO_(3)]和[BiO_(3)]三角体结构单元数量逐渐减少,[SiO_(4)]和[BO_(4)]四面体结构单元数量逐渐增多,玻璃的网络结构增强。当碱金属氧化物总量为15%(摩尔分数)时,双碱玻璃的热膨胀系数α_(25~320℃)、转变温度T_(g)和软化温度T_(f)比单碱玻璃的小,耐酸质量损失率D_(r)更低。当n(Li_(2)O)∶n(Na_(2)O)=1∶1时,双碱玻璃的α_(25~320℃)为9.35×10^(-6)℃^(-1),T_(g)值降低至439.8℃,T_(f)值为481.7℃,D_(r)值为0.00670 g/cm^(2)。将其应用于汽车玻璃油墨,烧结后的油墨具有良好的附着力、黑度、遮盖率和光泽度。

In this study,R_(2)O-Bi_(2)O_(3)-B_(2)O_(3)-SiO_(2)lead-free low-melting point glass was prepared by high temperature melting method and applied to automobile glass enamel.The effect of composition on the structure,thermal properties and acid resistance of glass was studied.The results show that with the increase of Bi_(2)O_(3)/B_(2)O_(3)and Bi_(2)O_(3)/SiO_(2),the[BO_(3)]and[BiO_(3)]triangular structural units gradually decrease,the[SiO_(4)]and[BO_(4)]tetrahedral structural units gradually increase,and the network structure of glass is enhanced.When the alkali metal oxide content is 15%(mole fraction),the thermal expansion coefficientα25~320℃,transition temperature T_(g)and softening temperature T_(f)of double alkali glass are smaller than those of single alkali glass,and the acid mass loss rate D_(r)is lower.When n(Li_(2)O)∶n(Na_(2)O)is 1∶1,theα25~320℃of double alkali glass is 9.35×10-6℃-1,the T_(g)value is reduced to 439.8℃,the T_(f)value is 481.7℃,and the D_(r)value is 0.00670 g/cm^(2).Applying it to automotive glass enamel,the sintered enamel has good adhesion,blackness,coverage and gloss.