The Fabrication Of Acrylate/nano-SiO₂ Composite Latex And Their Application In Laminating Adhesive

The adhesive on the basis of acrylate latex is one of the important technologies of emulsion polymerization applications. Acrylate adhesive has many advantages such as low cost, low pollution, easiness of controlling the synthesis conditions, good adhesion to a variety of materials, and colorless transparent of coating et al. However, acrylate polymers have still some shortcomings, such as the poor water resistance, the fouling resistance, heat resistance, cold resistance. It is important to find the appropriate modifiers to improve their shortcomings of the above mentioned, making the acrylic ester latex be applied more widely. This paper investigated the modification of acrylic latex on the basis of three different systems. The first was the acetate-acrylate emulsion modified by the treated nano-Si O2 with KH-570. The second was nano-Si O2/styrene-acrylic emulsion by in-situ polymerization method; The final was the nano-Si O2/polyurethane acrylate emulsion, which was obtained from the reaction of waterborne polyurethane, acrylate polymerization and nano-Si O2 of TEOS hydrolysis.In the experiment of vinyl acetate-acrylate/nano-Si O2 composite emulsion, after nano-Si O2 was treated with the silane coupling agent KH-570, the impact of different proportions of soft and hard monomers on the laminating adhesive was studied during the synthesis of vinyl acetate-acrylate emulsion. As the proportion of VAC increased, the emulsion viscosity increased gradually, The initial adhesion went on decreasing, while the permanent adhesion increased continuously, and the paper-plastic and plastic-plastic peel strength first increased and then decreased. As the ratio of VAC and BA was 40:60, the laminating adhesive had the best performance, and the plastic-plastic and paper-plastic peel strength reached the maximum. In the study of the impact of different nano-Si O2 contents on the performance of laminating adhesive of vinyl acetate-acrylate emulsion, it was found that with the increase of nano-Si O2, the emulsion viscosity increased gradually, the initial adhesion decreased gradually, while the permanent adhesion increased, and the paper-plastic and plastic-plastic peel strength first increased and then decreased. As w(Si O2)% was 1.5%, the plastic-plastic and paper-plastic peel strength reached the maximum. The technologies of DSC, TGA and FT-IR were used for the structural characterization of the propyl acetate and nano-Si O2 composite emulsion.In the experiment of in-situ polymerization of nano-Si O2/styrene-acrylic emulsion, different contents of TEOS were added to prepare the nano-Si O2 and styrene-acrylic emulsion containing different proportions of nano-Si O2. As w(Si O2)% was 1.5%, the plastic-plastic and paper-plastic peel strength reached the maximum. The technologies of DSC, TGA and FT-IR were used for the structural characterization of the nano-Si O2/styrene-acrylic composite emulsion. In the study of the impact of different nano-Si O2 contents on the performance of laminating adhesive of vinyl styrene-acrylic emulsion.In the experiment of nano-Si O2 /urethane acrylate composite emulsion, TEOS was first used for preparing nano-Si O2. In the study of the impact of different nano-Si O2 contents on the performance of laminating adhesive of urethane acrylate composite emulsion, it was found that with the increase of nano-Si O2, the emulsion viscosity increased gradually, the initial adhesion decreased gradually, while the permanent adhesion increased, and the paper-plastic and plastic-plastic peel strength first increased and then decreased. As w(Si O2)% was 1.0%, the plastic-plastic and paper-plastic peel strength reached the maximum. The technologies of DSC, TGA and FT-IR were used for the structural characterization of the nano-Si O2/urethane acrylate composite emulsion.