Influence of anti-caking agent kaolin on film formation of ethylene-vinylacetate and carboxylated styrene-butadiene latex polymers

被引：27
作者：
Baueregger, Stefan [1 ]
Perello, Margarita [2 ]
Plank, Johann [1 ]
机构：
[1] Tech Univ Munich, D-85747 Garching, Germany
[2] Dow Europe GmbH, CH-8810 Horgen, Switzerland
来源：
CEMENT AND CONCRETE RESEARCH | 2014年 / 58卷
关键词：
Dispersion; SEM; Polymers; Cement; Latex film formation; SCANNING-ELECTRON-MICROSCOPY; PARTICLES; MICROSTRUCTURE;
D O I：
10.1016/j.cemconres.2014.01.017
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Colloidal stabilizers (e.g. PVOH) and anti-caking aids (e.g. kaolin) are commonly added during the spray drying of liquid latex dispersions to produce re-dispersible polymer powders for the drymix mortar industry. Here, the influence of kaolin and polyvinylalcohol on polymer film formation of an ethylene-vinylacetate (EVA) and a carboxylated styrene-butadiene (SB) latex dispersion in water and cement pore solution was investigated. Time-dependent ESEM analysis was conducted to analyze the progress of particle coalescence. The results show that both EVA and SB powders form a homogeneous film much faster than their liquid precursors. Surprisingly, this effect was found to result from the presence of kaolin. Consequently, this additive fulfills a dual purpose in re-dispersible powders, it serves as anti-caking agent and also accelerates film formation while polyvinylalcohol retards particle coalescence. The SB latex achieves a coherent polymer film faster than the EVA dispersion, due to its smaller particle size (-200 nm). (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：112 / 120
页数：9
相关论文
共 31 条
[1]   Effect of EVA on the fresh properties of cement paste [J].
Betioli, A. M. ;
Gleize, P. J. P. ;
John, V. M. ;
Pileggi, R. G. .
CEMENT & CONCRETE COMPOSITES, 2012, 34 (02) :255-260
[2]   Chemical interaction between EVA and Portland cement hydration at early-age [J].
Betioli, A. M. ;
Hoppe Filho, J. ;
Cincotto, M. A. ;
Gleize, P. J. P. ;
Pileggi, R. G. .
CONSTRUCTION AND BUILDING MATERIALS, 2009, 23 (11) :3332-3336
[3]   INTERACTIONS OF POLYMERS AND ORGANIC ADMIXTURES ON PORTLAND-CEMENT HYDRATION [J].
CHANDRA, S ;
FLODIN, P .
CEMENT AND CONCRETE RESEARCH, 1987, 17 (06) :875-890
[4]   FILM FORMATION WITH LATEX-PARTICLES [J].
CHEVALIER, Y ;
PICHOT, C ;
GRAILLAT, C ;
JOANICOT, M ;
WONG, K ;
MAQUET, J ;
LINDNER, P ;
CABANE, B .
COLLOID AND POLYMER SCIENCE, 1992, 270 (08) :806-821
[5]   Nanocomposites of EVA/polystyrene nanoparticles/montmorillonite [J].
Chuayjuljit, Saowaroj ;
Worawas, Chutima .
JOURNAL OF COMPOSITE MATERIALS, 2011, 45 (06) :631-638
[6]   Applications of environmental scanning electron microscopy to colloidal aggregation and film formation [J].
Donald, AM ;
He, CB ;
Royall, CP ;
Sferrazza, M ;
Stelmashenko, NA ;
Thiel, BL .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2000, 174 (1-2) :37-53
[7]  
Dragnevski K.I., 2008, EM EL MICR AN GROUP
[8]   Latex Film Formation in the Environmental Scanning Electron Microscope [J].
Dragnevski, Kalin ;
Donald, Athene ;
Taylor, Phil ;
Murray, Martin ;
Davies, Simon ;
Bone, Elizabeth .
MACROMOLECULAR SYMPOSIA, 2009, 281 :119-125
[9]   An environmental scanning electron microscopy examination of the film formation mechanism of novel acrylic latex [J].
Dragnevski, Kalin I. ;
Donald, Athene M. .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2008, 317 (1-3) :551-556
[10]   Drying rate variations of latex dispersions due to salt induced skin formation [J].
Erkselius, Stefan ;
Wadso, Lars ;
Karlsson, Ola J. .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2008, 317 (01) :83-95
1234