硬脂酸钠改性镁铝水滑石的制备及其对PVC热稳定性能的影响
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摘要
采用硬脂酸钠对镁铝碳酸根型水滑石MgAl-CO_3-LDHs (LDHs)进行改性,讨论了改性工艺对聚氯乙烯(PVC)热稳定效果的影响,并通过X射线衍射仪(XRD)、傅立叶红外光谱仪(FTIR)、扫描电镜(SEM)对改性前后的水滑石进行表征。结果表明,硬脂酸钠未改变水滑石的层状结构,仅吸附在水滑石的表面;水滑石湿滤饼经硬脂酸钠改性后对PVC的热稳定效果最佳,其对PVC的初期着色性影响不大,但能大大地延长PVC的长期热稳定性,使静态热老化时间延长了57. 1%。
Sodium stearate was used to modify magnesium-aluminum-carbonate layered double hydroxides( LDHs),and the effect of the modification process on the thermal stability of PVC was discussed.XRD,FT-IR and SEM were used to characterize the LDHs before and after the modification. The results show that sodium stearate do not change the layered structure of LDHs but adsorbes on the surface of LDHs. Wet filter cake of LDHs modified by sodium stearate has the optimum thermal stability effect on PVC. It has little effect on the early color of PVC,but it can greatly improve the long-term thermal stability of PVC. The static thermal aging time is 57. 1%longer than that of unmodified LDHs.
Sodium stearate was used to modify magnesium-aluminum-carbonate layered double hydroxides( LDHs),and the effect of the modification process on the thermal stability of PVC was discussed.XRD,FT-IR and SEM were used to characterize the LDHs before and after the modification. The results show that sodium stearate do not change the layered structure of LDHs but adsorbes on the surface of LDHs. Wet filter cake of LDHs modified by sodium stearate has the optimum thermal stability effect on PVC. It has little effect on the early color of PVC,but it can greatly improve the long-term thermal stability of PVC. The static thermal aging time is 57. 1%longer than that of unmodified LDHs.
引文
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[3]叶江涛,章琛,陈富强,等.钙掺杂镁铝水滑石的制备及其对PVC热稳定性的影响[J].塑料工业,2018(2):71-75.
[4]易师.水滑石的制备与改性研究[D].长沙:中南大学,2010.
[5]倪哲明,付晓微,薛继龙,等.表面活性剂和硅烷偶联剂复合改性水滑石的表面性质[J].无机化学学报,2012,28(3):471-476.
[6]LIANG Y,YU K,ZHENG Q,et al.Thermal treatment to improve the hydrophobicity of ground Ca CO3particles modified with sodium stearate[J].Appl Surf Sci,2018,436:832-838.
[7]LI H,XUE F,BAI J,et al.Effect of sodium stearate on the surface properties of beta-calcium phosphate[J].Mater Lett,2015,161:455-458.
[8]褚之浩,杨占红,易师,等.镁铝水滑石和镁铝铈水滑石的表面改性研究[J].塑料助剂,2012(3):33-37.
[9]邢方方.LDHs表面性质的表征及有机化改性的研究[D].杭州:浙江工业大学,2008.
[10]YANG H,YANG Z.The effect of sodium stearate-modified hydrocalumite on the thermal stability of poly(vinyl chloride)[J].J Appl Polym Sci,2018,135(4):DOI:10.1002/app.45758.
[11]魏凤玉,张进成,叶江涛,等.硬脂酸锌改性水滑石热稳定剂的制备及应用[J].塑料工业,2016,44(10):118-121.
[12]中国国家标准化管理委员会.GB 8815-2008《电线电缆用软聚氯乙烯塑料》[S].北京:中国标准出版社,2008.
[13]朱健.水滑石类化合物的制备、改性及其在PVC中的应用[D].长沙:中南大学,2011.
[14]LIAO L,ZHAO N,XIA Z.Hydrothermal synthesis of MgAl layered double hydroxides(LDHs)from natural brucite and Al(OH)3[J].Mater Res Bull,2012,47(11):3897-3901.
[15]LIN Y J,LI D Q,EVANS D G,et al.Modulating effect of Mg-Al-CO3layered double hydroxides on the thermal stability of PVC resin[J].Polym Degrad Stab,2005,88(2):286-293.
[16]杨巧珍.LDH的表面作用原理及表面有机化研究[D].北京:北京化工大学,2002.
[17]WANG B,HUI Z,EVANS D G,et al.Surface modification of layered double hydroxides and incorporation of hydrophobic organic compounds[J].Mater Chem Phys,2005,92(1):190-196.
[18]冯伟刚.PVC型材原材料老化性能的评价[J].聚氯乙烯,2009,37(3):14-21.
[19]van der VEN L,van GEMERT M L M,BATENBURG L F,et al.On the action of hydrotalcite-like clay materials as stabilizers in polyvinylchloride[J].Appl Clay Sci,2000,17(1-2):25-34.