镧镁水滑石的制备及其对PVC热稳定性能的影响
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摘要
采用共沉淀法,改变La~(3+)/Mg~(2+)投料摩尔比和陈化温度制备了一系列镧镁水滑石。采用镧镁水滑石作为PVC热稳定剂,通过刚果红实验和动态热稳定性实验,探讨了不同制备条件下镧镁水滑石对PVC静态、动态热稳定性能的影响。结果表明,La~(3+)/Mg~(2+)投料摩尔比和陈化温度是影响镧镁水滑石中镧含量的主要因素。镧镁水滑石可以显著提高PVC的静态、动态热稳定性能。镧镁水滑石制备过程中,陈化温度是影响PVC/镧镁水滑石热稳定性和加工性能的关键因素。当陈化温度分别为90、100和110℃时,PVC/镧镁水滑石静态、动态热稳定性能明显高于陈化温度为70℃时的性能;当陈化温度为100℃时,镧镁水滑石对PVC的静态、动态热稳定性的影响较优,同时,PVC/镧镁水滑石的塑化扭矩较低,相应的加工能耗较低。
Lanthanum magnesium hydrotalcite was prepared through co-precipitation method,in which molar ratio of La~(3+)with Mg~(2+)and aging temperature were rectified. Lanthanum magnesium hydrotalcite was selected as thermal stabilizer for PVC. The effects of lanthanum magnesium hydrotalcite on static and dynamic thermal stability were estimated using Congo red method and torque rheometer. Molar ratio of La~(3+)with Mg~(2+)and aging temperature clearly influenced lanthanum content of lanthanum magnesium hydrotalcite. Lanthanum magnesium hydrotalcite dramatically improved the static and dynamic stability of PVC. Aging temperature was the key factor which affected the thermal stability of PVC. Lanthanum magnesium hydrotalcite prepared under aging temperature of 90、100 and 110 ℃ exhibited higher static and dynamic stability for PVC than that prepared under aging temperature of 70 ℃. When aging temperature was 100 ℃,static and dynamic thermal stability of PVC/lanthanum magnesium hydrotalcite was the optimal,and PVC/lanthanum magnesium hydrotalcite exhibited low plastification torque and processing energy consumpution.
Lanthanum magnesium hydrotalcite was prepared through co-precipitation method,in which molar ratio of La~(3+)with Mg~(2+)and aging temperature were rectified. Lanthanum magnesium hydrotalcite was selected as thermal stabilizer for PVC. The effects of lanthanum magnesium hydrotalcite on static and dynamic thermal stability were estimated using Congo red method and torque rheometer. Molar ratio of La~(3+)with Mg~(2+)and aging temperature clearly influenced lanthanum content of lanthanum magnesium hydrotalcite. Lanthanum magnesium hydrotalcite dramatically improved the static and dynamic stability of PVC. Aging temperature was the key factor which affected the thermal stability of PVC. Lanthanum magnesium hydrotalcite prepared under aging temperature of 90、100 and 110 ℃ exhibited higher static and dynamic stability for PVC than that prepared under aging temperature of 70 ℃. When aging temperature was 100 ℃,static and dynamic thermal stability of PVC/lanthanum magnesium hydrotalcite was the optimal,and PVC/lanthanum magnesium hydrotalcite exhibited low plastification torque and processing energy consumpution.
引文
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[19]王国建,王长明,李岩. BoltornTM型超支化聚酯对硬质PVC流变性能的影响[J].塑料工业,2006,34(11):33-35.
[20]刘芳,李杰,时凯.以塑化时间和塑化扭矩为定量指标的润滑平衡规律[J].聚氯乙烯,2010,38(10):24-27.
[2]张宁,李德玲,杨静.肉豆蔻酸稀土复合热稳定剂对PVC性能的影响[J].中国塑料,2013,27(7):81-85.
[3]赵劲松,付志敏,王栋.稀土复合稳定剂在PVC加工中的应用及稳定机理探讨[J].聚氯乙烯. 2002,30(3):30-34.
[4]李侃社,丁贺,闫兰英,等. N-苯基马来酰胺酸根合镧(Ⅲ)的合成及对PVC的热稳定作用[J].中国稀土学报,2009,27(4):460-463.
[5]彭振博,胡斌,苏庆德,等.稀土PVC稳定剂的作用机制研究[J].中国稀土学报,2003,21(3):255-258.
[6] LI M,LIANG Y,WANG X,et al. Synthesis of the complex of lanthanum(III)with N-(2-amino ethyl)maleamic acid radical and its application to PVC as thermal stabilizer[J]. Polymer Degradation and Stability,2016,124:87-94.
[7] GUO Y,ZHANG Y L,CHEN Q L,et al. Preparation and research of the multifunctional heat stabilizer with rare earth used in PVC products[J]. Advanced Materials Research,2013,652/653/654:470-474.
[8] QIU G,ZHANG M,ZHOU L,et al. Study on preparation and properties of PVC film modified by rare earth[J]. Journal of Rare Earths,2003,21(1):37-41
[9]刘鑫,舒万艮,桂客,等.水滑石(HT)类热稳定剂的发展状况和应用前景[J].塑料助剂,2004(1):12-13+22.
[10]华幼卿,秦倩,段雪.新型聚氯乙烯热稳定剂-水滑石的研究[J].聚氯乙烯,2001(6):42-45.
[11]李蕾,张春英,矫庆泽,等. Mg-Al-CO3与Zn-Al-CO3水滑石热稳定性差异的研究[J].无机化学学报,2001,17(1):113-118.
[12]肖轶,马骏,任韶玲,等.碳酸根离子柱撑钴铝水滑石的合成与表征[J].催化学报,1999,20(4):459-462.
[13]蒋维,莫桂娣,金烈,等.铈杂多配离子-水滑石超分子层柱材料ZnAl-Ce(PMo V)2的插层组装、表征及催化性能[J].中国稀土学报,2007,25(1):32-38.
[14]刘建才,廉世勋,朱爱玲,等.铕掺杂类水滑石的发光性质及其选择性红外吸收[J].发光学报,2007,28(1):67-73.
[15] SONG Y,XU J,DING L,et al. Syntheses,characterization and biological activities of rare earth metal complexes with curcumin and1, 10-phenanthroline-5, 6-dione[J]. Journal of Inorganic Biochemistry,2009,103(3):396-400.
[16]陈骏飞,孙阳艺,石林,等.镧、铕掺杂类水滑石材料的结构分析与性能研究[J].功能材料,2011,42(s4):677-680.
[17]刘庆艳,杨占红,易师.复合水滑石热稳定剂对PVC热稳定性能的影响[J].中国有色金属学报,2010,20(2):363-370.
[18]杨占红,易师,贺红梅. PVC用热稳定剂镁铝铈类水滑石的合成[J].中南大学学报:自然科学版,2011,42(4):897-902.
[19]王国建,王长明,李岩. BoltornTM型超支化聚酯对硬质PVC流变性能的影响[J].塑料工业,2006,34(11):33-35.
[20]刘芳,李杰,时凯.以塑化时间和塑化扭矩为定量指标的润滑平衡规律[J].聚氯乙烯,2010,38(10):24-27.