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Study on Preparation and Performance of Waterborne Novolac Epoxy Emulsion

Author: LinZuoChuang
Tutor: YangZhuoRu
School: South China University of Technology
Course: Applied Chemistry
Keywords: The aqueous phenolic epoxy emulsion Chemically modified Auxiliary emulsifying Curing behavior Environmental protection
CLC: TQ323.5
Type: Master's thesis
Year: 2011
Downloads: 149
Quote: 0
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Abstract


Waterborne epoxy resin system to avoid the volatile organic compounds (volatile organic compound stay or referred to the extensive use of VOC) has significant environmental features and value. Thus epoxy water-based research and its application to become one of the areas of concern in recent years. Start from the molecular design and chemical modification method, to select the multi-functional phenolic epoxy quantitative addition reaction with p-aminobenzoic acid (PABA), synthesis of a molecular structure having an epoxy group, and having The hydrophilic group of the modified resin. Then emulsifier THF auxiliary emulsifying, with diethanolamine salt, plus water opposite conversion obtained epoxy novolac resin emulsion system. Through research, to determine the appropriate modification process: epoxy group of open-loop rate of 20%, the reaction temperature of 105 ° C, reaction time 40h, emulsifier sodium lauryl sulfate sodium added amount 0.2g/30g (phenolic epoxy resin) = 0.67%, emulsifying temperature of 60 ° C, the salt-forming rate is 100%, the final average particle diameter of the resulting emulsion to 276nm. By infrared spectroscopy were used to characterize the structure of the modified products to prove that the modified resin is completely in line with the expected results of the molecular design. Opposite aspects of the turn before the emulsification temperature, solvent and the applied catalyst analysis of the factors affecting the stability of phenolic epoxy resin emulsion found emulsification temperature and solvent usage is too high, will reduce the the phenolic epoxy emulsion stability, select the emulsification temperature 60 ℃, solvent dioxane dosage of 50g (the phenolic epoxy 30g). Meanwhile, the catalyst is boron trifluoride etherate added stability of the emulsion does not have a positive impact. Caused by the the phenolic epoxy emulsion instability of factors may be led to the pseudo thickening of the hydrogen bond, the phenolic epoxy thickened emulsion can be re-shear dispersion to meet the application requirements. Temperature-programmed method to study the curing behavior of the aqueous phenolic epoxy emulsion / polyamide 8536 system. Epoxy emulsion at different heating rates launching phenolic / the polyamide 8536 system dynamic curve have an exothermic peak The obtained reaction activation energy is 100.43kJ/mol, the reaction is a chemical reaction. Determination system theory curing Curing process parameters: the gel temperature (T gel) 100 ° C, a curing temperature (T curing) 125 ° C, and the post-treatment temperature (T after processing) 130 ° C]. Curing properties of the study on the basis of preliminary exploration of the feasibility of the application of the water-based epoxy phenolic emulsion coatings. The results indicate that the coating film obtained by the curing system of the aqueous phenolic epoxy emulsion / polyamide curing agent 8536 smooth, adhesion 3, the hardness reaches 6H, pliable sexual reached 2mm, having excellent water resistance and chemical properties.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Epoxy resins and plastics
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