Preparation And Stability Property Study Of Acrylate Emulsion Used As The Binder Of Water-based Ink

In recent years, the pollution problem of volatile organic solvents in coatings, adhesives and inks has worked up the attention of more and more researchers and manufactures. In the printing industry, the development of water-based ink has become the consensus of the industry. In the preparation of water-based ink, it is a difficulty to balance the hardness, good mechanical properties and printing adaptability of the ink, such as low temperature film-forming performance. In order to overcome these drawbacks, hard/soft latex blends or latexes with a core-shell structure were often used as the binder of ink. The research content of this dissertation concentrated on preparation and properties of acrylate emulsions of the above two systems, mainly focusing on the stability of acrylic emulsions, especially their alcohol-resistance stability. The aim is to reveal the structure-property relationship of emuisions and prepare binders and inks with high performance, especially excellent alcohol resistance stability, thereby to meet the increasingly market requirements. The main contents are as follows:1. Non-crosslinked hard acrylic emulsion having a high glass transition temperature (Tg above rome temperature) and crosslinkable soft acrylic emulsion having a low glass transition temperature (Tg below rome temperature) were synthesized. Meanwhile, in order to obtain latex with good stability, the effect of emulsifiers, dosage of various monomers and the polymerization process on the properties of emulsion were studied. Then, hard/soft latex blends by mixing proportionable hard and soft latices were prepared. The performance of the soft latex and latex blends were studied by using the minimum film formation temperature instrument, the differential scanning calorimeter (DSC), dynamic mechanical analyzer (DMA), material testing machine, dynamic light scattering instrument (DLS), stability analyzer, atomic force microscopy (AFM) and other instruments. The influence of mass ratio of hard/soft latex in latex blends on the latex property of calcium ion stability and alcohol-resistqance stability, as well as the glass-transition temperature (Tg), storage modulus, loss modulus, tensile stress, elongation at break and the morphology of the latex films were systematic studied.2. The ambient temperature corsslinkable core-shell acrylate emulsion is prepared by a semi-continuous seed emulsion polymerization and pre-emulsion polymerization method. An optimized binary composite emulsify system with a reactive anionic emulsifier and a nonionic emulsifier was obtained. The influence of hard monomer species, the type and amount of the acid monomer, pH regulators type, the dosage of cross-linking monomer on the performance of core-shell latex, especially the stability of latex, has been systematicly studied. Finally, an emulsion with good alcohol-resistance stability was prepared by using the optimized formulation and polymerization technology, which behave excellent overall performance on PE, PP, PET, PA films.3. The performance of the ink prepared based on the above core/shell emulsion binder was studied and compared with the ink obtained with a type of imported DSM emulsion. The properties of the ink, such as redissolve performance, adhesion performance, rub resistance, scratch resistance, web friction performance, boiling resistance, resistance to hydrogen peroxide were investiged systematically. The results showed that the water-based ink produced here has excellent overall performances, particularly the property of the redissolve and adhesion performance.