聚烯烃粘性树脂材料的开发

发布时间：2018-01-18 05:08

  本文关键词：聚烯烃粘性树脂材料的开发　出处：《天津科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 聚乙烯 马来酸酐 过氧化苯甲酰 剥离强度 接枝率 凝胶含量 粘性树脂

【摘要】：本论文通过熔融接枝方法对聚乙烯(PE)接枝马来酸酐(MAH)制备粘性树脂材料进行研究。实验对接枝过程的加工温度、基础树脂选择、引发剂和单体的最佳配方以及添加助剂减少副交联反应进行研究,制得能良好粘接尼龙6(PA6)膜且交联晶点几乎为零的聚烯烃粘性树脂。测试了制得的接枝物的接枝率及凝胶含量,并对其剥离强度、拉伸性能、熔体流动速率、流变性能、热学性能、水蒸气透过率及结晶等多项性能进行研究。实验通过改变基体树脂的种类,包括：低密度聚乙烯(LDPE)、超低密度聚乙烯(VLDPE)、线性低密度聚乙烯(LLDPE)以及不同树脂的复配体系,确定能良好粘接PA6膜的粘性树脂的基体树脂为VLDPE/LLDPE=90/10的复配体系。研究了接枝所需的最佳加工温度,通过改变不同的加工温度研究对体系的性能影响,确定了最佳加工温度为170℃。化学滴定法和红外光谱分析表明,MAH单体确实接枝到了PE大分子链上。实验采用过氧化苯甲酰(BPO)为引发剂,研究了不同添加量的BPO对接枝体系的影响。通过实验得出,随BPO含量的增加,接枝率先上升后降低,当BPO添加含量为0.08份时,为体系最佳选择；同时研究了不同添加量的MAH对接枝体系的影响,随MAH含量的增加,接枝率先上升后小幅度下降,当MAH添加含量为0.8份时,为体系的最佳选择。由于接枝过程中会出现不可避免的交联副反应,即出现凝胶现象,研究的粘性树脂在吹膜时会出现晶点问题,影响薄膜表观及对PA6膜的粘接性能,因此尝试了不同种类的加工助剂二甲基甲酰胺(DMF)和苯乙烯(St),改善了晶点问题,且St效果更好。通过研究最终可得结论：在170℃加工温度下,以VLDPE/LLDPE=90/10复配体系为基体树脂,MAH添加量为0.8份,BPO的添加量为0.08份,减少交联的助剂St的添加量为0.8份时,体系接枝率达到1.78%,凝胶含量为4.3%,对PA6膜的剥离强度达到65.9N/cm,基本符合实际应用要求。
[Abstract]:In this paper, the melt grafting method was used to study the preparation of viscous resin materials by grafting polyethylene (Pe) onto maleic anhydride (MAH). The processing temperature of the grafting process and the selection of the basic resin were studied. The optimum formulation of initiator and monomer and the addition of additives to reduce the side crosslinking reaction were studied. Polyolefin adhesive resin with good adhesion to nylon 6 / PA6) film with almost zero cross-linking crystal point was prepared. The graft rate and gel content of the grafted polymer were measured, and the peel strength and tensile properties of the resin were also studied. The melt flow rate, rheological properties, thermal properties, water vapor transmittance and crystallization were studied by changing the types of matrix resins, including: LDPE (low density polyethylene). Ultra low density polyethylene (VLDPE), linear low density polyethylene (LLDPE) and the blend system of different resins. The matrix resin of the adhesive resin with good adhesion to PA6 film was determined as the compound system of VLDPE/LLDPE=90/10. The optimum processing temperature for grafting was studied. The optimum processing temperature was determined to be 170 鈩，

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