新型核壳结构丁苯乳液的制备与表征
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摘要
为改性丁苯乳液表面结构,以提高乳液的耐水性,以丁苯乳液(SBR)作为种子胶乳,甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、丙烯酸异辛酯(2-EHA)和苯乙烯(St)为壳层单体,采用预乳化半连续种子乳液聚合工艺,合成一种新型核壳结构的丁苯乳液。利用马尔文粒径仪和透射电镜研究了单体种类、核壳质量比对乳液粒径和形貌的影响,并从乳胶膜接触角和吸水率两方面探究了乳胶膜的耐水性能。结果表明:以MMA和2-EHA为壳层单体,核壳质量比5∶5时,合成的乳胶粒具有明显的核壳结构,且其粒径增加了28 nm;水在乳胶膜上的接触角从52. 95°提高到93. 20°,吸水率减小了4. 68%。核壳结构丁苯乳液的耐水性得到了明显提高。
In order to modify the surface structure of styrene-butadiene emulsion and improve its water resistance,the novel core-shell structure styrene-butadiene emulsion was prepared by semicontinuous seed-emulsion polymerization,using styrene-butadiene latex( SBR) as the core,and methyl methacrylate( MMA),butyl acrylate( BA),isooctyl acrylate(2-EHA) and styrene( St) as the shell.The influences of monomer and core-shell mass ratio on particlesize and morphology of the emulsion were studied by using Malvern particle size analyzer and transmission electron microscope.The water resistance of the latex film was also investigated. The experimental results indicate that the novel styrene-butadiene emulsion show a typical core-shell structure and the particle size increases by 28 nm when the ratio of SBR core and MMA/2-EHA shell is 5 ∶ 5. Water contact angle increasesfrom 52. 95° to 93. 20° and the water absorption decreases by 4. 68%. The water resistance of the novel styrene-butadiene emulsion is significantly improved.
In order to modify the surface structure of styrene-butadiene emulsion and improve its water resistance,the novel core-shell structure styrene-butadiene emulsion was prepared by semicontinuous seed-emulsion polymerization,using styrene-butadiene latex( SBR) as the core,and methyl methacrylate( MMA),butyl acrylate( BA),isooctyl acrylate(2-EHA) and styrene( St) as the shell.The influences of monomer and core-shell mass ratio on particlesize and morphology of the emulsion were studied by using Malvern particle size analyzer and transmission electron microscope.The water resistance of the latex film was also investigated. The experimental results indicate that the novel styrene-butadiene emulsion show a typical core-shell structure and the particle size increases by 28 nm when the ratio of SBR core and MMA/2-EHA shell is 5 ∶ 5. Water contact angle increasesfrom 52. 95° to 93. 20° and the water absorption decreases by 4. 68%. The water resistance of the novel styrene-butadiene emulsion is significantly improved.
引文
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[13]SHAMIM A,MUHAMMAD A T.Synthesis of acrylate binder from soft and hard monomers through emulsion polymerization to introduce mechanical properties to the applied substrate[J].American Journal of Chemistry,2017,7(1):1-5.
[14]陆馨,辛忠,杨海.分散聚合法制备甲基丙烯酸甲酯-苯乙烯共聚物微球[J].功能高分子学报,2005,18(2):310-315.
[15]BORTHAKUR L J,JANA T,DOLUI S K.Preparation of core-shell latex particles by emulsion co-polymerization of styrene and butyl acrylate,and evaluation of their pigment properties in emulsion paints[J].Journal of Coatings Technology&Research,2010,7(6):765-772.
[2]ZHU Z,LU Z,DING J,et al.A Novel blending adhesive in the fabrication of the composite cathode for lithium-ion batteries[J].Chemelectrochem,2017,4(10):2709-2716.
[3]王磊,宋远波,赖小娟,等.羧基丁苯胶/封闭聚氨酯纸基复合材料的制备及防水增强作用[J].化工新型材料,2013,41(8):161-163.
[4]BAGHINI M S,ISMAIL A.Application of carboxylated styrene-butadiene emulsion-Portland cement mixture as road base material[J].International Journal of Pavement Engineering,2017,18(12):1-11.
[5]MALAS A,DAS C K.Selective dispersion of different organoclays in styrene butadiene rubber in the presence of a compatibilizer[J].Materials&Design,2013,49:857-865.
[6]SHIN D,Park H,PAIK U.Cross-linked poly(acrylic acid)-carboxymethyl cellulose and styrene-butadiene rubber as an efficient binder system and its physicochemical effects on a high energy density graphite anode for Li-ion batteries[J].Electrochemistry Communications,2017,77:103-106.
[7]KWAG G,NA D H,CHOI J K.Method for preparing styrene-butadiene copolymer using reactive emulsifier and styrenebutadiene copolymer prepared by the same:US,US8530017[P].2013-09-10.
[8]臧金燕,祁蕾,吴金丽,等.硅改性苯丙乳液的粒径与成膜耐水性[J].新型建筑材料,2013,40(7):69-71.
[9]施晓旦,王养臣,尹东华.一种丁苯乳液及其制备方法和应用:CN 105713124 A[P].2016-06-29.
[10]谢波,张震乾,丁建宁,等.半连续乳液聚合制备纳米乳胶粒及其表征[J].高分子材料科学与工程,2017,33(12):17-21.
[11]崔建珍,吴伟.一种水溶性聚合物压裂液体系的研究[J].广西大学学报(自然科学版),2010,35(3):415-418.
[12]王海花,兰静,费贵强,等.丙烯酸酯软硬单体含量对PU/PA复合乳液及其表面施胶性能的影响[J].功能材料,2014,45(15):15051-15054.
[13]SHAMIM A,MUHAMMAD A T.Synthesis of acrylate binder from soft and hard monomers through emulsion polymerization to introduce mechanical properties to the applied substrate[J].American Journal of Chemistry,2017,7(1):1-5.
[14]陆馨,辛忠,杨海.分散聚合法制备甲基丙烯酸甲酯-苯乙烯共聚物微球[J].功能高分子学报,2005,18(2):310-315.
[15]BORTHAKUR L J,JANA T,DOLUI S K.Preparation of core-shell latex particles by emulsion co-polymerization of styrene and butyl acrylate,and evaluation of their pigment properties in emulsion paints[J].Journal of Coatings Technology&Research,2010,7(6):765-772.