采用共混挤出的加工方法,以聚偏氟乙烯(PVDF)为基材,通过添加相容性好的聚甲基丙烯酸甲酯(PMMA)和耐温性较高的聚酰胺6(PA6),制备出耐温性较高和制备成本较低的PVDF/PMMA/PA6热熔胶。通过热变形维卡软化点试验机、热重分析仪、微机控制电子万能试验机以及扫描电子显微镜分析了PA6含量对PVDF/PMMA/PA6热熔胶微观结构、粘接性能以及热稳定性的影响。结果表明:PA6质量分数为15%时,热熔胶粘接性能最优,经过150℃热处理之后粘接强度仍能保持40.76N/15mm,满足150℃条件下剥离强度保持40N/15mm的要求;PA6质量分数为15%时,热熔胶的维卡软化温度为156℃,初始分解温度为350℃,383℃时最大分解速率为 -27.2%/min。
The processing method of blending and extrusion was adopted,polyvinylidene fluoride (PVDF) was used as the substrate,and polymethylmethacrylate (PMMA) with good compatibility and polyamide 6 (PA6) with high temperature resistance were added to prepare PVDF/PMMA/PA6 hot melt adhesive with high temperature resistance and low cost.The effects of different mass fractions of PA6 on the microstructure,adhesive property and thermal stability of PVDF/PMMA/PA6 hot melt adhesives were explored by Vicat softening tester,thermogravimetric tester,microcomputer controlled electronic universal testing machine and electron scanning microscope.The test results showed that,when the content of PA6 was 15%,the adhesion is the best.After 150℃ heat treatment,the adhesion strength could still maintain 40.76N/15mm,meeting the requirements of 40N/15 mm peel strength at 150℃;Vicat softening temperature was 156℃;the initial decomposition temperature was 350℃.The maximum decomposition rate was -27.2%/min at 383℃.
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基金资助
国家自然科学基金(21704008);江苏省自然科学基金面上项目(BK20201449);江苏省高等学校自然科学研究重大项目(20KJA430011)
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