水滑石分散剂用量对热膨胀微胶囊的粒径及其芯材含量的影响
|
摘要
在悬浮聚合体系中以水滑石(LDH)作为分散剂制备的聚合物为壳体,正己烷为芯材的微胶囊。微胶囊受热后壳体软化、芯材气化产生热膨胀效果。改变LDH用量探究微胶囊粒径和芯材含量的变化规律。利用扫描电子显微镜、热失重仪、静态热分析仪分析了不同LDH用量时制得的热膨胀微胶囊的微观形貌、粒径、发泡剂含量和膨胀性能。结果表明,当LDH的用量增加到5%(以水相质量为基准,下同)时,微胶囊表面光滑,球形较完整,平均粒径降到11μm,发泡剂含量提高到16%(质量分数,下同),热膨胀性能良好,D_(max)达到750μm。
Thermal expansion microcapsules based on an n-hexane core and a polymeric shell were synthesized through suspension polymerization with hydrotalcite as a dispersant. The thermal expansion effect could be obtained from the evaporation of core materials after the microcapsules were heated to soften the shell. The morphology, particle size and selling properties of microcapsules were characterized by scanning electron microscopy, thermogravimetric analysis and static thermal analyzer, andthe effect of hydrotalcite content on the particle size and core loading of microcapsules were investigated. The results indicated that the microcapsules exhibited a regular morphology with a smooth surface and an average particle size of 11 μm when 5 wt % of hydrotalcite was added. The microcapsules also achieved an improved thermal expansion property with a dmax value of 750 μm when 16 wt % of foaming agent was loaded.
Thermal expansion microcapsules based on an n-hexane core and a polymeric shell were synthesized through suspension polymerization with hydrotalcite as a dispersant. The thermal expansion effect could be obtained from the evaporation of core materials after the microcapsules were heated to soften the shell. The morphology, particle size and selling properties of microcapsules were characterized by scanning electron microscopy, thermogravimetric analysis and static thermal analyzer, andthe effect of hydrotalcite content on the particle size and core loading of microcapsules were investigated. The results indicated that the microcapsules exhibited a regular morphology with a smooth surface and an average particle size of 11 μm when 5 wt % of hydrotalcite was added. The microcapsules also achieved an improved thermal expansion property with a dmax value of 750 μm when 16 wt % of foaming agent was loaded.
引文
[1] 苏峻峰,任丽,王立新.微胶囊技术及其最新研究进展[J].材料导报,2003,17(S1):141-144. SU J F, REN L, WANG L X. Microcapsule Technology and Its Latest Research Progress[J]. Material Guide, 2003, 17(S1): 141-144.
[2] YASUHIRO K,YOSUKE I.Effects of the Chemicalstructure on the Heat Resistance of Thermoplastic Expandable Microspheres[J].Journal of Applied Polymer Science, 2005, 96(11): 1 306-1 312.
[3] MASSIMOT,GIOVANNI B.Heat-expandab Lemicrospheres for Car Protection Production[J]. Progress in Organic Coatings, 1997,32(1-4):17-24.
[4] MAGNUS J,OVE N,EVA M.Thermally Expandable Microspheres with Excellent Expansion Characteristics at HighTemperature[J]. Journal of Applied Polymer Science, 2010, 117(1):384-392.
[5] KAWAGUCHI Y, OISHI T.Synthesis and Properties of Thermoplastic Expandable Microspheres: the Relation Between Crosslinking Density and Expandable Property[J]. Journal of Applied Polymer Science, 2004, 93(2): 505-512.
[6] 何思阳.丙烯腈-丙烯酸甲酯共聚低温热膨胀微胶囊的制备与性能[J].塑料工业,2013,4(5):96-100. HE S Y. Preparation and Properties of Acrylonitrile-methyl Acrylate Copolymer Low Temperature Thermal Expansion Microcapsules[J]. Plastics Industry, 2013, 4(5): 96-100.
[7] HOU Z S,XIA Y R,QU W Q,et al. Preparation and Properties of Thermoplastic Expandable Microspheres with P(VDC-AN-MMA) Shell by Suspension Polymerization[J]. International Journal of Polymeric Materials and Polymeric Biomaterials,2015,64(8): 427-431.
[8] 朱玉俊.介绍一种新型弹性体材料-聚烯烃弹性体( POE)[J].化工新型材料,1998,26(10):20-22. ZHU Y J. Introducing a New Type of Elastomer Material-polyolefin Elastomer (POE) [J]. New Chemical Materials, 1998, 26 (10): 20-22.
[9] 周树学.偏氯乙烯共聚物中空颗粒制备的基础研究[D]. 杭州:浙江大学,2000.
[10] GON?ALVES O H,STAUDT T,DE ARAúJO P H H, et al. Foaming of Poly(Methyl Methacrylate) Particles[J].Materials Science and Engineering: C,2009, 29(2): 479-484.
[11] JONSSON M,NORDIN O,KRON A L,et al. Thermally Expandable Microspheres with Excellent Expansion Characteristics at High Temperature[J]. Journal of Applied Polymer Science,2010, 117(1): 384-392.
[12] 谢贵明,王稚阳,包永忠.水相添加剂对热可膨胀聚合物微球颗粒结构和膨胀特性的影响[J].化工学报,2015,66(11): 4 682-4 688. XIE G M,WANG Z Y,BAO Y Z. Effect of water phase additives on Particle Structure and Expansion Behavior of Thermal-expandable Polymer Microspheres[J]. Journal of Chemical Industry and Engineering (China),2015,66(11): 4 682-4 688.
[13] 李蕾,朱凯,张立,等.4-MAA与2-NSA共插层镁铝LDH的制备和光物理性质[J].无机化学学报,2012,27(4):1-2. LI L, ZHU K, ZHANG L, et al. Preparation and Photophysical Properties of Co-intercalated Magnesium-Aluminum LDH with 4-MAA and 2-NSA[J]. Journal of Inorganic Chemistry, 2012, 27(4): 1-2.
[14] 朱效杰,刘峰,潘肇埼,等.含甲基丙烯酸的髙温热膨胀微球的合成及其发泡性能研究[J].塑料工业,2013,41(4):14-22. ZHU X J, LIU F, PAN Z Q, et al. Synthesis and Foaming Properties of Yttrium-containing Thermostable Microspheres Containing Methacrylic Acid[J]. Plastics Industry, 2013, 41(4): 14-22.
[15] 丁婉,刘峰,缪克存,等.高温物理发泡微胶囊的制备及其对发泡性能的影响研究[J].塑料工业,2012,40(6):24-28. DING W, LIU F, QI K C, et al. Preparation of High Temperature Physical Foaming Microcapsules and Their Effects on Foaming Properties[J]. Plastics Industry, 2012, 40(6): 24-28.
[16] HUANG Y. Preparation of Thermally Epandable Polymer Particles[D]. Lehigh University,2004.
[17] 吴明华.物理发泡胶囊的研制及其在立体巧花中的应用[D]. 东华大学,2002.
[2] YASUHIRO K,YOSUKE I.Effects of the Chemicalstructure on the Heat Resistance of Thermoplastic Expandable Microspheres[J].Journal of Applied Polymer Science, 2005, 96(11): 1 306-1 312.
[3] MASSIMOT,GIOVANNI B.Heat-expandab Lemicrospheres for Car Protection Production[J]. Progress in Organic Coatings, 1997,32(1-4):17-24.
[4] MAGNUS J,OVE N,EVA M.Thermally Expandable Microspheres with Excellent Expansion Characteristics at HighTemperature[J]. Journal of Applied Polymer Science, 2010, 117(1):384-392.
[5] KAWAGUCHI Y, OISHI T.Synthesis and Properties of Thermoplastic Expandable Microspheres: the Relation Between Crosslinking Density and Expandable Property[J]. Journal of Applied Polymer Science, 2004, 93(2): 505-512.
[6] 何思阳.丙烯腈-丙烯酸甲酯共聚低温热膨胀微胶囊的制备与性能[J].塑料工业,2013,4(5):96-100. HE S Y. Preparation and Properties of Acrylonitrile-methyl Acrylate Copolymer Low Temperature Thermal Expansion Microcapsules[J]. Plastics Industry, 2013, 4(5): 96-100.
[7] HOU Z S,XIA Y R,QU W Q,et al. Preparation and Properties of Thermoplastic Expandable Microspheres with P(VDC-AN-MMA) Shell by Suspension Polymerization[J]. International Journal of Polymeric Materials and Polymeric Biomaterials,2015,64(8): 427-431.
[8] 朱玉俊.介绍一种新型弹性体材料-聚烯烃弹性体( POE)[J].化工新型材料,1998,26(10):20-22. ZHU Y J. Introducing a New Type of Elastomer Material-polyolefin Elastomer (POE) [J]. New Chemical Materials, 1998, 26 (10): 20-22.
[9] 周树学.偏氯乙烯共聚物中空颗粒制备的基础研究[D]. 杭州:浙江大学,2000.
[10] GON?ALVES O H,STAUDT T,DE ARAúJO P H H, et al. Foaming of Poly(Methyl Methacrylate) Particles[J].Materials Science and Engineering: C,2009, 29(2): 479-484.
[11] JONSSON M,NORDIN O,KRON A L,et al. Thermally Expandable Microspheres with Excellent Expansion Characteristics at High Temperature[J]. Journal of Applied Polymer Science,2010, 117(1): 384-392.
[12] 谢贵明,王稚阳,包永忠.水相添加剂对热可膨胀聚合物微球颗粒结构和膨胀特性的影响[J].化工学报,2015,66(11): 4 682-4 688. XIE G M,WANG Z Y,BAO Y Z. Effect of water phase additives on Particle Structure and Expansion Behavior of Thermal-expandable Polymer Microspheres[J]. Journal of Chemical Industry and Engineering (China),2015,66(11): 4 682-4 688.
[13] 李蕾,朱凯,张立,等.4-MAA与2-NSA共插层镁铝LDH的制备和光物理性质[J].无机化学学报,2012,27(4):1-2. LI L, ZHU K, ZHANG L, et al. Preparation and Photophysical Properties of Co-intercalated Magnesium-Aluminum LDH with 4-MAA and 2-NSA[J]. Journal of Inorganic Chemistry, 2012, 27(4): 1-2.
[14] 朱效杰,刘峰,潘肇埼,等.含甲基丙烯酸的髙温热膨胀微球的合成及其发泡性能研究[J].塑料工业,2013,41(4):14-22. ZHU X J, LIU F, PAN Z Q, et al. Synthesis and Foaming Properties of Yttrium-containing Thermostable Microspheres Containing Methacrylic Acid[J]. Plastics Industry, 2013, 41(4): 14-22.
[15] 丁婉,刘峰,缪克存,等.高温物理发泡微胶囊的制备及其对发泡性能的影响研究[J].塑料工业,2012,40(6):24-28. DING W, LIU F, QI K C, et al. Preparation of High Temperature Physical Foaming Microcapsules and Their Effects on Foaming Properties[J]. Plastics Industry, 2012, 40(6): 24-28.
[16] HUANG Y. Preparation of Thermally Epandable Polymer Particles[D]. Lehigh University,2004.
[17] 吴明华.物理发泡胶囊的研制及其在立体巧花中的应用[D]. 东华大学,2002.