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Studies On Alcohol Soluble Polyacrylate Laminating Adhesive Modified With Siloxane And Polyurethane

Posted on:2011-10-03Degree:MasterType:Thesis
Country:ChinaCandidate:Z L JinFull Text:PDF
GTID:2121360305972850Subject:Polymer Chemistry and Physics
Abstract/Summary:PDF Full Text Request
With the development of the environmental protection rules, chemical industry also full of challenges. Green and low carbon chemical industry will become the developing trend. Consequently, the packing industry is also included. With the big market demanding of the packing industry, the laminating adhesives also developed rapidly. Though the water-based laminating adhesive was exist at present, the solvent-based adhesive remain widely used because of its excellent properties comparing with the disadvantages which the water-based adhesive have, such as high surface tension, low solid content, low drying speed and so on. So the problem that most of solvents are bad to the health and environment is not solved. To the solution, this paper has got a kind of environmental friendly adhesive which was synthesize in alcohol solvent. It can keep the balance between water-based adhesives and solvent-based adhesives.At the beginning of the paper, current research situation and modification methods of alcohol soluble polyacrylate and polyurethane were reviewed, and the developing trend was also discussed. Then the adhesion mechanism and influence factors of adhesion strength of the laminating adhesive were introduced.In the second chapter, a kind of well alcohol soluble, transparent, yellow and viscidity solution was get from ethyl acrylate as a main alcohol soluble monomer, functional acrylate and self-synthesized monomer by free radical polymerization. This adhesive was cast on the plastic film to testing the adhesion properties after modified by siloxane. The influence factors of adhesion were roughly researched. The overall conversion rate, water absorption rate were tested. Other properties were also conferred by DSC, TG and SEM. The result shows that the incorporation of siloxane lowered the overall conversion rate of monomer, water resistance and the Tg of polymer, but improved heat resistance and adhesion strength. SEM shows that when the siloxane content surpassed a proper amount, the improving of adhesion strength was not ratio with the contents of siloxane but decreasing when the contents of siloxane surpass a proper amount.In the third chapter, one-pot polyacrylate-polyurethane adhesives were also got. For the one-pot adhesive, a new designed method was used to getting a comb liked structure. Here, single double carbon bond blocked polyurethane pre-polymer was got firstly, then, it was used to copolymerize with the acrylate monomers. At last, we get the comb liked copolymers. The contents of the polyurethane were improved greatly comparing with the multi double carbon bond blocked polyurethane. This adhesive has a rigidity polyacrylate main chain and a soft polyurethane side chain which can improve the adhesion strength dramatically. In this experiment, the structure of polyurethane pre-polymer was confirmed by HMR, and the peak decomposition of IR shows that the incorporation of polyurethane can improve the hydrogen bond interaction between polyurethane and polyacrylate. Thermal analysis indicated that the Tg of the polymer was lowered, heat resistance and T peel off strength were improved due to the introducing of polyurethane.In the fourth chapter, two-pot polyacrylate-polyurethane adhesive was got in the following method. The main agent of alcohol soluble polyacrylate with epoxy group was got firstly. Then the polyurethane with ethyl ammine blocked was got as the curing agent. Different kinds of adhesives were got by adjusting the ratio of the two components. NMR and IR were used to confirming the structure of the main agent and curing agent. Influence of different ratio of main agent and curing agent on the mechanical properties, water absorption rate, heat resistance and adhesion strength was researched. The result shows that these properties were not only related with the ratio between main agent and curing agent, but also related with the structure of the polyurethane. Besides these, the adhesive has good film formation properties, and not shrinks during the curing process.
Keywords/Search Tags:siloxane, polyurethane, acrylate, alcohol soluble, laminating adhesive
PDF Full Text Request
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