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利用红外光谱和差式扫描量热技术剖析了国内外3种具有代表性的热收缩带所用热熔胶粘剂结构与组成的差异,并对胶粘剂的抗剪切性能和环球软化点进行测试。研究了胶粘剂组成与结构差异对热收缩带与主管PE间剥离性能的影响,结果表明:国内外热收缩带产品所用热熔胶粘剂在其组成和结构上存在较大差别,国外胶粘剂的抗剪切性能和剥离强度,尤其是高温下的抗剪切和剥离性能显著高于国内产品。基于对热熔胶粘剂化学组成的分析,指出胶粘剂组成与结构差异是影响热收缩带抗剪切和剥离性能的重要原因,性能差异在很大程度上是由于国内产品所用热熔胶粘剂含有较多的低熔点增粘树脂,同时缺少高熔点组分所致。最后,对热收缩带现场剥离性能测试方法、评判指标的改进以及热收缩带长期粘接性能的研究方法提出了建议。(表2,图3,参6)
The difference of structure and composition of hot melt adhesives used in three typical domestic and overseas heat shrinkable tapes was analyzed by means of infrared spectroscopy and differential scanning calorimetry. The shear resistance and the global softening point of the adhesive were tested. The effects of the composition and structure of the adhesive on the peelability between the heat shrinkable tape and the main PE were studied. The results showed that the hot melt adhesive used in the domestic and overseas heat shrinkable tape products had a great difference in composition and structure. The shear resistance of the foreign adhesive Performance and peel strength, especially at high temperatures, shear and peel properties were significantly higher than domestic products. Based on the analysis of the chemical composition of the hot melt adhesive, it is pointed out that the difference of the composition and structure of the adhesive is an important factor that influences the anti-shearing and peeling properties of the heat shrinkable tape. The difference in performance is largely due to the fact that hot melt adhesives used in domestic products contain more Low melting point tackifying resin, while lack of high melting point components. Finally, some suggestions on the test methods of on-site peel test of heat shrink tape, the improvement of judgment index and the research method of long-term adhesive performance of heat shrink tape are put forward. (Table 2, Figure 3, reference 6)