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العنوان
Using magnesium hydroxide in protective coating /
المؤلف
Kashwaa, Reham Farid Ahmed.
هيئة الاعداد
باحث / ريهام فريد احمد قشوع
مشرف / راوية مصطفي حمودة
مناقش / طارق احمد فؤاد خليفه
مناقش / محمد حازم عبد اللطيف
تاريخ النشر
2022.
عدد الصفحات
90 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الهندسة (متفرقات)
تاريخ الإجازة
1/1/2022
مكان الإجازة
جامعة عين شمس - كلية الهندسة - قسم التصميم وهندسة الإنتاج
الفهرس
Only 14 pages are availabe for public view

from 90

from 90

Abstract

Background: Hydration process of magnesia was compared in different media.
In this paper shows the rate of hydration of magnesia for forming magnesium hydroxide. Two types of caustic calcined magnesia (CCM1 and CCM2) each hydrated with magnesium acetate and distilled water as control. The influence of the magnesium acetate and the reactivity of the two types of caustic calcined magnesia was studied by Thermogravimetric analysis, differential scanning calorimetry, mass spectrum, particle size and pH. Also, both citric acid and acetic acid test were done to measure the reactivity of Magnesium oxide powder. The mechanical properties of epoxy-resin reinforced with magnesium hydroxide powder was investigated. The different quantities of magnesium hydroxide were mixed with the epoxy resin to enhance the flame retardancy of the polymeric matrix composite. The influence of magnesium hydroxide concentration on the flame-retardant performance was evaluated, and the best proportion of magnesium hydroxide for flame retardancy was discussed. The percentage used was 30, 40, and 50 weight percent.
Results: Experimental data show increasing magnesia hydration rates in presence of magnesium acetate and with increasing temperature, as expected. The results indicate that the hydration rate of both oxides in magnesium acetate system generate more heat in short period of time than water system. The hydration peak of both magnesia with Magnesium acetate system reached the maximum after 4 h is 33 mW, while in water system is 13 mW. There is no significant difference between both oxides. The hydration process after 24 h in magnesium acetate system showed the highest percentage (86%), while after 0.5 h hydration (47%) formed. The results showed that the samples with 50% of magnesium hydroxide observed the best flame retardant effect, and the increase of magnesium hydroxide concentration could significantly improve the flame retardant performance of the epoxy resin. But when magnesium hydroxide content reached 50%, the mechanical properties of the composite slightly reduced.
Keywords: Magnesium acetate, Hydration process, TGA, Magnesium oxide, magnesium hydroxide, composite, flame retardant, mechanical properties, epoxy-resin.