偶氮复合发泡剂对交联聚氯乙烯泡沫结构和性能的影响

doi:10.3724/SP.J.1095.2014.40055

摘要/Abstract

摘要： 采用异氰酸酯和环氧树脂作为交联剂，偶氮二异丁腈（AIBN）和偶氮二甲酰胺（AC）作为发泡剂制备了交联聚氯乙烯泡沫材料。通过扫描电子显微镜分析了两种发泡剂的粒径、比例以及用量对泡孔结构的影响。结果表明，AIBN的粒径对泡沫的泡孔结构影响不大，但其用量增加导致泡沫密度减小；AC的粒径对泡孔结构产生一定的影响，最优的粒径范围为8～20 μm，并且随着用量增加，泡孔尺寸变小，但对密度影响不大。采用DSC研究了AIBN和AC在预混料中的分解情况，提出了两种发泡剂影响泡沫的泡孔结构的机理。对泡沫材料力学性能的分析表明，泡沫的强度随密度的增加而增加，剪切变形则在60～80 kg/m3密度范围内出现最大值。

关键词: 交联聚氯乙烯泡沫, 发泡剂, 异氰酸酯, 环氧树脂

Abstract: Polyvinyl chloride(PVC) foam cross-linked by isocyanate and epoxy resin was prepared. Both azobisisobutyronitrile(AIBN) and azodicarbonamide(AC) were used as foaming agents in the prefoam process. Morphologies of foams were characterized by SEM. The effects of particle size, proportion, loading of foaming agents were investigated. The particle size of AIBN has no effect on the cell structure, but the increase of AIBN loading leads to a lower density. The effect of AC particle size on the cell structure is obvious, and the optimal size is 8~20 μm. The cell size mainly depends on the loading of AC. Decomposition of foaming agent was studied by DSC. Both the decomposition behavior of mixed foaming agents and the nucleating effect of AC for the prefoam determine the cell morphology of the resultant foams. The strength increases with the increase of density, but the maximum shear strain appears in the foams with the density of 60~80 kg/m3.

Key words: cross-linked polyvinyl chloride foam, foaming agent, isocyanate, epoxy

中图分类号:

O631.1

姜治伟, 薛俭, 杜中辉, 唐涛, 刘文彬. 偶氮复合发泡剂对交联聚氯乙烯泡沫结构和性能的影响[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.40055.

JIANG Zhiwei1,2, XUE Jian1, DU Zhonghui3, TANG Tao1*, LIU Wenbin3. Effect of Foaming Agents on Structure and Properties of Crosslinked Polyvinyl Chloride Foam[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.40055.

参考文献

[1] Atas C,Sevim C. On the Impact Response of Sandwich Composites with Cores of Balsa Wood and PVC Foam[J]. Compos Struct,2010,93(1):40-48.

[2] Bull P H,Edgren F. Compressive Strength after Impact of CFRP-foam Core Sandwich Panels in Marine Applications[J]. Composites Part B,2004,35(6):535-541.

[3] Vermeeren C. Around Glare:A New Aircraft Material in Context[M]. Dordrecht:Kluwer Academic Publishers,2002:145-157.

[4] Stewart R. At the Core of Lightweight Composites[J]. Reinforced Plastics,2009,53(3):30-35.

[5] Lim G T,Altstadt V,Ramsteiner F. Understanding the Compressive Behavior of Linear and Cross-linked Poly(vinyl chloride) Foams[J]. J Cell Plast,2009,45(5):419-439.

[6] Benning C J,Benning C J. Plastic Foams: the Physics and Chemistry of Product Performance and Process Technology[M]. New York:Wiley-Interscience,1969:413-421.

[7] YUAN Huilin,LIAO Qiancheng. Study and Preparation of Cross-linked Foamed Polyvinyl Chloride Plate[J]. China Plast Ind,2010,38(6):68-71(in Chinese).

苑会林,廖前程. 交联发泡聚氯乙烯板材的研究与制备[J]. 塑料工业,2010,38(6):68-71.

[8] SHI Aihua,ZHANG Guangcheng,MA Zhonglei,et al. Study on Crosslinked Rigid Polyvinyl Chloride Foam Platics with Low Density[J]. Appl Chem Ind,2011,40(2): 287-290(in Chinese).

史爱华,张广成,马忠雷,等. 低密度交联硬质聚氯乙烯泡沫塑料的研究[J]. 应用化工,2011,40(2):287-290.

[9] ZHU Wenqiang,BEN Jin,WANG Jian,et al. Method for Producing a Modified Cross-linked PVC Foam Body:CN,200910033041.X[P],2009-11-18(in Chinese).

朱文强,贲进,王键,等. 一种改进的交联聚氯乙烯结构泡沫及其制备方法:中国,200910033041.X[P],2009-11-18.

[10] TANG Tao,JIANG Zhiwei. Method for Producing a Cross-linked PVC Foam Body:CN,201110255967.0[P],2011-08-23(in Chinese).

唐涛,姜治伟. 一种交联聚氯乙烯泡沫及其制备方法:中国,201110255967.0[P],2011-08-23.

[11] TANG Tao,JIANG Zhiwei. Method for Producing a PVC Foam:CN,201310512456[P],2013-10-25(in Chinese).

唐涛,姜治伟. 一种聚氯乙烯泡沫及其制备方法:中国,201310512456[P],2013-10-25.

[12] HU Pei. Design of Sandwich Structure and Selection of Foam Core Material for Aircraft[J]. Aeronaut Manuf Technol,2010,(17):94-96(in Chinese).

胡培. 飞机夹层结构的设计和泡沫芯材的选择[J]. 航空制造技术,2010,(17):94-96.

[13] Landler Y. A New Rigid Cross-Linked PVC Foam Chemistry and Properties[J]. J Cell Plast,1967,3(9):400-404.

[14] Elser M. Method for Producing a Cross-linked PVC Foam Body:WO,2005002234[P],2005-07-28.

[15] Ang S S,Bressan R,Lauri L,et al. Formulations for Cellular, Foamed-Polymer Products Based on Polyvinyl Chloride, Improved Cellular, Foamed-Polymer Products Based on Polyvinyl Chloride and a Process for Producing Said Improved Cellular Foamed-Polymer Products:WO,2007001547[P],2007-03-30.

[16] Doroudiani S,Kortschot M T. Polystyrene Foams.Ⅱ.Structure Impact Properties Relationships[J]. J Appl Polym Sci,2003,90(5):1421-1426.