无微泡抗紫外线复合防火玻璃的制备研究

Study on preparation of composite fireproof glass with UV resistance and no micro-bubble

传统的复合防火玻璃夹层凝胶主要以聚丙烯酰胺为基础,由于聚丙烯酰胺为有机物,并且在制备过程中容易产生气泡,因此针对复合防火玻璃易产生气泡和耐候性差等缺陷,制备了一种新型夹层凝胶用于复合防火玻璃。60℃下真空搅拌硅溶胶和KOH混合物,并在80℃下高温固化,通过加入聚二甲基硅氧烷/异丙醇复配消泡剂抑制凝胶气泡的产生,加入多元醇改善凝胶的耐温性。使用改装马弗炉进行耐火性测试,采用辐照箱做耐候性检测,以及通过其他检测方法对试样进行表征。结果表明:当SiO_2∶KOH=2∶1(摩尔比)时,防火玻璃的透光率达到达到86.6%,紫外线照射前后透光率变化了5.8%,且防火玻璃气泡较少。

The inter-layer gel of traditional composite fireproof glass is mainly based on polyacrylamide,however,the application of fireproof glass is constrained due to many micro-bubbles,poor fire resistance and UV resistance which are resulted in organic polyacrylamide and its preparation process.Also the fire resistance is poor and hard to meet the market demand.Thus a new type of inter-layer gel was researched to deal with these issues.The mixture of silica solution and potassium hydroxide（KOH）was stirred in the vacuum at 60℃ and then cured at 80℃,simultaneously,complex antifoaming agent of polydimethylsiloxane/isopropanol and polyol were added to inhibit the generation of bubbles and improve temperature resistance respectively.The modified muffle furnace,radiation oven and other devices were used to characterize the fire resistance and UV resistance,etc.The results showed that when the ratio of molar mass fraction of SiO2 and KOH was 2∶1,the transmittance reached 86.6% and the change rate of transmittance after ultraviolet irradiation was 5.8%.