Preparation of self-crosslinked acrylate emulsion with high elasticity and its rheological properties

Abstract

Using butyl acrylate(BA), methyl methacrylate(MMA), methacrylic acid(MAA) and mixed emulsifier as raw materials, the self-crosslinked emulsion was prepared via pre-emulsified and semi-continuous seeded emulsion polymerization technology in the presence of N-hydroxymethyl acrylamide and poly solidum maleate. The influence of mass ratio of BA to MMA, amount of N-hydroxymethyl acrylamide and poly solidum maleate on the rheological properties of the self-crosslinked emulsion was studied. Possible cross-linked mechanism of self-crosslinked monomer was investigated. And the relationship between emulsion viscosity and shear rate was investigated. The results show that the self-crosslinked acrylate emulsion with high elasticity can be synthesized when the mass fractions of BA is 60%, MMA is 40%, and added amount of N-hydroxymethyl acrylamide is 2.5%–3.0% and added amount of poly solidum maleate is 0.3%–0.4%. The self-crosslinkage process of N-hydroxymethyl acrylamide involves two steps. One is copolymerization of N-hydroxymethyl acrylamide and acrylate, the other is cross-linkage among polymer molecules via condensation reaction of methylol. The emulsion is of rheological properties of pseudo-plastic fluid and belongs to non-Newtonian fluid.

Keywords

self-crosslinkage / acrylate emulsion / rheological properties / condensation reaction

References

[1] KönnerW.. Influence of raw materials on the formulation of interior emulsion paints from the point of view of EN 13300 [J]. Macromolecular Symposia, 2002, 187(1): 895-908

[2] MizutaniT., AraiK., MiyamotoM., KimuraY.. Application of silica-containing nano-composite emulsion to wall paint: A new environmentally safe paint of high performance [J]. Progress in Organic Coatings, 2006, 55(3): 276-283

[3] ZhangX.-y., SunZ.-j., HuangH., LiY.-j., LanR.-h., ChenH.-qin.. Synthesis and properties of acrylate latex modified by vinyl alkoxy siloxane [J]. Journal of Central South University of Technology, 2007, 14(5): 666-672

[4] SchulzeG. W., ErdoganF.. Periodic cracking of elastic coatings [J]. International Journal of Solids and Structures, 1998, 35(28/29): 3615-3634

[5] WangB. L., HanJ. C.. Multiple surface cracking of elastic coatings subjected to dynamic load [J]. Mechanics of Materials, 2007, 39(5): 445-457

[6] AggarwalL. K., ThapliyalP. C., KaradeS. R.. Properties of polymer-modified mortars using epoxy and acrylic emulsions [J]. Construction and Building Materials, 2007, 21(2): 379-383

[7] HeF., LiuY.-nian.. Modification of acrylic electrophoretic coating by isocyanate [J]. Journal of Central South University of Technology: Natural Science, 1998, 29(5): 505-507

[8] MoriguchiN., TsugaruT., AmivaS.. Molecular design of the polymer forming the complex with metal (I): Design of the hard-segments of thermoplastic elastomers by using model compounds [J]. Journal of Molecular Structure, 1999, 477(1/3): 191-199

[9] LeonardiF., DerailC., MarinG.. Some applications of molecular rheology: Polymer formulation and molecular design [J]. Journal of Non-Newtonian Fluid Mechanics, 2005, 128(1): 50-61

[10] GuoT.-y., ChenX., SongM.-d., ZhangB.-hua.. Preparation and properties of core [poly(styrene-n-butyl acrylate)]-shell [poly(styrene-methyl methacrylate-vinyl triethoxide silane)] structured latex particles with self-crosslinking characteristics [J]. Journal of Applied Polymer Science, 2006, 100(3): 1824-1830

[11] ChenY.-j., ZhangC.-c., WangY.-f., ChengS.-y., ChenP.-zhi.. Study of self-crosslinking acrylate latex containing fluorine [J]. Journal of Applied Polymer Science, 2003, 90(13): 3609-3616

[12] GuoT.-y., ChenX., HaoG.-j., SongM.-d., ZhangB.-hua.. Preparation and properties of room temperature self-crosslinking poly (MMA-co-BA-co-St-co-VTES) latex film [J]. Advances in Polymer Technology, 2005, 24(4): 288-295

[13] CHEN Li-jun, ZHANG Xin-ya, HUANG Hong, CHEN Huan-qin. Preparation of acrylate latex used in polymer-cement waterproof coating with pre-emulsified semi-continuous seeded emulsion polymerization [J]. New Building Materials, 2005(8): 1–5. (in Chinese)

[14] HongX.-y., FengH.-bao.Chemistry of coatings [M], 20052Beijing, Science Press: 15-22

[15] Fernández-GarcíaM., Cuervo-RodriguR., MadrugaE. L.. Glass transition temperatures of butyl acrylate-methyl methacrylate copolymers [J]. Journal of Polymer Science (Part B): Polymer Physics, 1999, 37(17): 2512-2520

[16] WuH.-r., WangB.-fang.Polymer physics [M], 1990, Shanghai, Chemical Engineering Institute of Eastern China Press: 224-227

[17] WicksZ. W., AndersonE. A., CulhaneW. J.. Morphology of water-soluble acrylic copolymer solutions [J]. Journal of Coatings Technology, 1982, 688(54): 57-61

[18] ZhangL., LiuJ.-qin.. Rheological property of organosilicone-modified acrylate emulsions [J]. Chinese Journal of Applied Chemistry, 2003, 20(3): 210-214