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    Home > Coatings News > Paints and Coatings Market > Coating technology: improvement of the determination method of epoxy value of waterborne epoxy emulsifier

    Coating technology: improvement of the determination method of epoxy value of waterborne epoxy emulsifier

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: 0 Introduction With the increasing demand for environmental friendly coatings, waterborne coatings have become an important direction of coating development, and waterborne epoxy coatings are more popular because of their high mechanical properties, strong adhesion, corrosion resistance and chemical resistance At present, there are three methods of waterborne epoxy resin: mechanical method, chemical modification method and reverse conversion method In order to overcome the influence of compatibility between emulsifier and epoxy resin on the performance of film, reactive epoxy resin emulsifier has been developed in recent years The epoxy value of such emulsifier directly affects the hydrophilicity, lipophilicity and preparation of emulsifier Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Home of coatings: 0 Introduction with the increasing demand for environmentally friendly coatings, waterborne coatings have become an important direction of the development of coatings, and waterborne epoxy coatings with its high mechanical properties, strong adhesion, good corrosion resistance and chemical resistance are more popular At present, there are three methods of waterborne epoxy resin: mechanical method, chemical modification method and reverse conversion method In order to overcome the influence of compatibility between emulsifier and epoxy resin on the properties of film, a reactive epoxy resin emulsifier has been developed in recent years The epoxy value of such emulsifier directly affects the hydrophilicity, lipophilicity and the stability of emulsion Therefore, the accurate determination of the epoxy value of emulsifier is very important The determination methods of epoxy value include hydrochloric acid pyridine method, hydrochloric acid acetone method, hydrochloric acid dioxane method, direct titration of hydrogen bromide acetic acid solution, non-aqueous titration of tetraethyl ammonium perchlorate, colorimetry, spectral analysis, etc Hydrochloric acid - The operation of pyridine method is complex, and pyridine is toxic and irritant; the reagents used in dioxane hydrochloric acid method are expensive and unstable, and need to be dehydrated; the disadvantages of direct titration method of hydrogen bromide acetic acid solution lie in the strong volatility of hydrogen bromide, and the prepared standard solution needs to be calibrated before each use; the cost of non-aqueous titration method of tetraethyl ammonium perchlorate is high, and it pollutes the ring The colorimetric method is only suitable for the determination of trace epoxy groups in polymers There are some shortcomings in the spectral analysis method, such as the standard spectrogram and the quantitative curve drawn by the standard sample The reagent used in hydrochloric acid acetone method is cheap and easy to operate It has been widely used in the determination of epoxy value of diphenolpropane epoxy resin, but there is also a big error Based on GB 1677-1981, this study aims to change the operating conditions and determine the epoxy value of waterborne epoxy emulsifier to obtain more accurate analysis conditions 1 experimental part 1.1 the principle of the experiment is to use hydrochloric acid acetone method to determine the epoxy value of waterborne epoxy emulsifier The principle is to use excessive hydrochloric acid to react with epoxy group The excessive hydrochloric acid is titrated by NaOH solution The chemical reaction formula is as follows: the home of the additive reaction between hydrochloric acid and epoxy group is focused on coating, diatom mud, paint coating, coating technology, News and information of fire retardant coating, coating, diatom mud, paint coating, coating technology, decoration knowledge and decoration effect map of fire retardant coating,
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