Utjecaj različitih ugušćivača na svojstva premaza

master's thesis

• Title (english): Influence of different thickeners on coating properties
• Author: Tomislav Jozinović
• Mentor: Mirela Leskovac (mentor)
• Committee member: Mirela Leskovac (predsjednik povjerenstva)
• Committee member: Domagoj Vrsaljko (član povjerenstva)
• Committee member: Vesna Ocelić Bulatović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-07-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Organski zaštitni premazi predstavljaju najčešće korišteni mehanizam zaštite drva, metala i drugih materijala od štetnog djelovanja okoliša. Predstavljaju tanke opne između materijala i okoliša kojemu je materijal izložen, a funkcija im može biti zaštitna i dekorativna. Sastoje se od više komponenti, od kojih najvažniju ulogu imaju vezivo i otapalo koje direktno utječe na viskoznost premaza. Ostali dodaci premazima, zajedno s vezivom i otapalom, moraju osigurati zadovoljavajuću viskoznost premaza kako bi se osigurala kvalitetna primjenska svojstva premaza. Na viskoznost ovih sustava utječu i ugušćivači. Oni djeluju na način da povećavaju viskoznost premaza, a pri tome se ne mijenjaju njihova osnovna svojstva. Dodatkom različitih vrsta ugušćivača u sastav premaza, utječe se na njegova svojstva, ali i toplinsko i reološko ponašanje. Najčešće korištene vrste ugušćivača su anorganski, na bazi gline i organski ugušćivači koji se djelomično razlikuju u mehanizmu djelovanja. Oni se dodaju premazima u različitim koncentracijama kako bi se pratio njihov utjecaj na reološko ponašanje i utjecaj na toplinska, ali i primjenska svojstva premaza. Ispitivanja reoloških svojstava provedena su u različitim vremenskim intervalima kako bi se pratile promjene viskoziteta premaza što je važno za njihovu primjenu. Toplinska svojstva premaza određena su tehnikama diferencijalne (razlikovne) pretražne kalorimetrije i termogravimetrijske analize. Reološka svojstva premaza ispitana su kako bi se utvrdio utjecaj različitih ugušćivača i stabilnost disperzija nakon stajanja tijekom 30 dana. Primjenska i mehanička svojstva premaza ispitana su različitim metodama kako bi se ispitala otpornost premaza na mehanička oštećenja, habanje i koroziju. Iz provedenih ispitivanja dobiven je uvid o utjecaju ugušćivača na primjenska svojstva premaza.

Abstract (english)

Organic protective coatings are the most commonly used means of protecting wood, metal and other materials from harmful environmental influences. They represent thin membranes between the material and the environment to which the material is exposed, and their function can be both protective and decorative. They consist of several components, the most important of which are the binder and the solvent, which directly affect the viscosity of the coating. Other coating additives, together with the binder and solvent, must provide sufficient coating viscosity to ensure the quality of the coating's application properties. Thickeners also affect the viscosity of these systems. They increase the viscosity of the coating without changing its basic properties. The addition of different types of thickening agents to the composition of the coating affects its properties, as well as its thermal and rheological behavior. The most commonly used types of thickeners are inorganic, clay and organic thickeners, some of which differ in their mechanism of action. They are added to coatings at different concentrations to monitor their influence on rheological behavior and effects on thermal and application properties of the coating. The rheological properties were tested at different time intervals to monitor the changes in the viscosity of the coating, which is important for its application. The thermal properties of the coating were studied by differential scanning calorimetry and thermogravimetric analysis. The rheological properties of the coating were tested to determine the influence of different thickening agents and the stability of the dispersion after 30 days of standing. The application and mechanical properties of the coating were tested by different methods to check the resistance of the coating to mechanical damage, wear and corrosion. The tests performed provided information on the influence of the thickening agents on the application properties of the coating.

• Keywords: zaštitni premazi; reološki aditivi; toplinska svojstva; reološka svojstva
• Keywords (english): protective coatings; rheological additives; thermal properties; rheological properties
• Language: croatian
• URN:NBN: urn:nbn:hr:149:479072
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-02-26 17:19:13