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利用红外光谱和力学性能的变化研究了聚乙烯醇缩丁醛薄膜的热老化和紫外光老化机理,结果表明,在热老化及紫外光老化过程中,PVB薄膜的拉伸强度均是先增大然后再减小。这是由于在热老化过程中PVB薄膜发生了增塑剂的损失及PVB分子主链和侧链的断裂,而在紫外光老化过程中,主要是发生PVB分子链之间的交联反应,仅有少量的分子链发生断裂。PVB薄膜的光老化和热老化都是由树脂中存在少量聚醋酸乙烯分解生成的自由基诱导而发生的,添加适量的热稳定剂和紫外吸收剂可以吸收薄膜加工时生成的自由基,从而提高薄膜的稳定性及粘结性能。
The mechanism of thermal aging and ultraviolet aging of polyvinyl butyral film were studied by means of IR and mechanical properties. The results showed that the tensile strength of PVB film first increased in the process of thermal aging and ultraviolet aging Then reduce it. This is due to the loss of plasticizer and the breakage of the main and side chains of the PVB molecules during the thermal aging of the PVB film. In the course of UV light aging, the cross-linking reaction between PVB molecular chains occurs mainly only A small amount of molecular chains are broken. Photo-aging and heat aging of PVB films are induced by free radical generated by the decomposition of a small amount of polyvinyl acetate in the resin. Adding appropriate amount of heat stabilizer and UV absorber can absorb the free radicals generated during film processing and thus improve Film stability and bonding properties.