| Nowadays, we begin to focus on the living conditions; therefore more and more people are attracted by the environmental anti-formaldehyde paint. However, the current products available in the market are diversity in quality and function; even some products without any actual effect claim as anti-formaldehyde ones. Some product may contain the ability to remove formaldehyde in some extent, but varies from one to another in mechanism respectively. Emuls ion, as the binder of latex paint, plays the most important role in forming film, It mains the real anti-formaldehyde paint should be produced by using anti-formaldehyde emuls ion rather than adsorption method or similar mechanism. The so-called anti-formaldehyde emuls ion such kind of emuls ion grafted with some functional groups which can make reaction with formaldehyde at room temperature as well as thoroughly validated through a series of anti-formaldehyde experiments. Considering this, the thesis aims at both the polymerization of anti-formaldehyde latex and the formulation design of anti-formaldehyde paint.One stage of the thesis focuses on the polymerization of anti-formaldehyde latex. First, it elaborated the mechanism of emuls ion polymerization. Next it discussed about the process, the monomer to choose, the design of polymer's Glass transition temperature and the influence of reaction conditions on the polymer film. After that it analyzed the reaction mechanism of the functional monomer including how to introduce and its quantity to affect the efficiency of removing the formaldehyde. Finally, after having improved the quality consecutively, I am successful in polymerizing the latex specimen which could be left for the further study in next phase.The second stage of the thes is is about the formulation design of anti-formaldehyde paint. To develop a coating formulation is a technique subject which demands the designer has a wide range of academic background related to polymer chemistry, physical chemistry, fine chemistry and so on. This part began with the introduction about the components of the paint together with its function and optimized the dosage of the latex and additive in the paints by means of DOE. Besides this, pigment volume concentration(PVC) is also a key factor to the coating performance. I also determined the genre and amount of fillers and pigments through calculating PVC and CPVC. In addition, I mentioned the connection and difference from the 2 aspec t, the PVC of the sample in this dissertation is absolutely qualified for high-end product. Then, in order to reinforce the property of removing formaldehyde, I invented a special functional additive using emulsion polymerization.The last stage is about the summary of the article. Compared with previous associated research, the innovation of my thesis lies on the below 3 points: First, most previous literatures had reported the monomer with amino-group worked as the functional ingredient, while this thes is intends to use AAEMA with double-carbonyl group as the functional monomer, not only different in reaction mechanism but also more efficient. Second, nearly all the past literatures merely focus on one aspect of this theme, either on emulsion polymerization the material part or coating producing the production part. Contributing to the adequate experiment resource, I could make a thorough research procedure on both material and production; obviously, it is more systematic, more integrated and more persuasive. Last but not the least, I managed to compose a new effective anti-formaldehyde agent and introduced it into the paint system with good compatibility. The formulated sample behaved sensationally in hiding, color retention, elastomeric, stain-proof and so on. As for the main target, the performance of anti-formaldehyde is much better than that of the products made by the giant coating manufacturers such as Dulux or Nippon Paint. Furthermore, this additive is completely original, it wouldn't be found anywhere in the market. |
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