Izboljšava intumescentnih premazov z dodatkom plastovitih dvojnih hidroksidov

Turkovic, Mihael (author), Cerc Korošec, Romana (mentor)

Intumescentni premazi so protipožarni premazi, pri katerih ob izpostavitvi povišanim temperaturam (med 200 °C in 250 °C) poteče intumescentna reakcija. Premaz med potekom reakcije ekspandira in tvori zoglenelo plast pene, ki deluje kot toplotni izolator, ki površino ščiti pred hitrim naraščanjem temperature in preprečuje dostop gorljivih snovi. Zaradi estetskega videza in enostavne uporabe prevladujejo med pasivnimi protipožarnimi zaščitami. Protipožarne lastnosti intumescentnih premazov je mogoče izboljšati z dodatkom aditivov, med drugim plastovitih dvojnih hidroksidov (LDH). Namen mojega diplomskega dela je bila sinteza cink-aluminijevega LDH kot aditiva intumescentnim premazom in primerjava obnašanja dveh različnih intumescentnih premazov brez oziroma z dodanim LDH. Zn-Al LDH sem sintetiziral z metodo soobarjanja pri konstantnem pH, nato pa sem z ionsko izmenjavo kloridne ione zamenjal s karbonatnimi. Obe dobljeni strukturi sem potrdil z rentgensko praškovno analizo (XRD). Sintetiziran LDH sem dodal dvema intumescentnima premazoma v različnih masnih deležih. Premaze sem nanesel na lesene kocke in z metodami termične analize primerjal razlike v njihovem obnašanju pri izpostavitvi povišani temperaturi ter skušal ugotoviti, kateri pripravljen premaz ima najboljše lastnosti.

• Language: Slovenian
• Keywords: intumescentni premazi, plastoviti dvojni hidroksidi (LDH), termična analiza, termogravimetrija (TG), analiza sproščenih plinov (EGA)
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2022
• PID: 20.500.12556/RUL-135413
• COBISS.SI-ID: 101470723
• Publication date in RUL: 11.03.2022

Secondary language

• Language: English
• Title: Improvement of intumescent coatings with addition of layered double hydroxides

Abstract

Intumescent coatings are fire retardant coatings in which an intumescent reaction occurs at temperatures between 200 °C and 250 °C. The coating then expands to form a thick char layer that acts as a thermal insulator, protecting the surface from heat and combustible materials. Due to their aesthetics and ease of application, they are the most popular among passive fire protection products. The fire retardant properties of intumescent coatings can be improved by various additives, such as layered double hydroxides (LDH). The objective of my diploma thesis was to synthesise zinc-aluminium LDH, which was then added to intumescent coatings to improve their fire retardant properties. The coprecipitation method was used to synthesise Zn-Al LDH at constant pH. Then, the chloride ions were replaced by carbonates through an ion exchange reaction. Both structures of LDH were confirmed by X-ray diffraction analysis (XRD). Synthesized LDH was added to two different intumescent coatings in different mass fractions. The coatings were applied to wooden cubes. Thermoanalytical methods were used to compare the differences in the behaviour of the coatings during exposure to elevated temperatures. Based on the obtained results, we tried to find the coating with optimal properties.

• Keywords: layered double hydroxides (LDH), intumescent coatings, thermal analysis, thermogravimetry (TG), evolved gas analysis (EGA)