Preparation Of Alkali Resistance Butadiene-styrene-acrylate Emulsion Polymers In Fiberglass Mesh

More and more fiberglass mesh were applied in architecture, it could improve the ability of alkali resistance and strength of fiberglass mesh by coating the mesh with emulsion polymer. Most of the coating were poor strength, easy corroding, bad handle, tackiness and others defects. An alkali resistance emulsion binder used in fiberglass mesh was achieved according to correct these shortcomings. Effects of mass ratio of butadiene-styrene to acrylate, glass transition temperature(Tg) of acrylate polymer, dosage of functional monomers, the feeding time of acrylate monomers and dosage of crosslinking agent on the properties of emulsion coating were investigated. Particle morphology was characterized, Tg of copolymer was detected, particle size distribution was observed and polymer was analyzed by IR spectra in this paper. Results were as follow:(1)The monomers emulsion containing acrylate monomers and functional monomers were fed into butadiene-styrene latex with stirring, then they polymerized with each other, and then crosslinking agent was dispersed to the emulsion. The emulsion forms a continuous coating over fiberglass mesh and the coating having good properties such as high strength, alkali resistance, softness, blocking resistance and high gloss.(2) Optimal technology conditions: The mass ratio of butadiene-styrene to acrylate is 6/4. Tg of polymer was 15 癈 or so by adjusting the contents of acrylate monomers. 3% N-hydroxymethylacrylamide and 3% crylic acid were fed into the emulsion and the feeding time of monomers emulsion was 120 minutes. 1.0-3.0% crosslink agent A, or 0.4-0.6% crosslink agent B, or 0.5-1,5% crosslink agent C were fed to the emulsion, they could improved the alkali resistance and strength of emulsion coating.(3) It was found that acrylate polymer can encase butadiene-styrene when mass ratio of butadiene-styrene to acrylate is 6/4 by transmission electron microscopy detecting. It was also found that particle diameter will rise with the increasing of dosage of acrylate monomers by particle size distribution analysing. IR spectra of polymer shows that feeding acrylate monomers to butadiene-styrene will introduce -OH, -COOH and -COOR into the emulsion.