Študij vpliva polimernih funkcijskih dodatkov na aplikacijske lastnosti kataforeznega epoksi temeljnega premaza

Rus, Ajda (author), Genorio, Boštjan (mentor)

V magistrski nalogi je predstavljena optimizacija zaščite problematičnih robov kovinskih substratov z epoksi kataforeznim temeljnim premazom z uporabo treh različnih dodatkov. Ti so pigmentna pasta, mikrogel MG 1 in mikrogel MG 2. Izhodiščno razmerje veziva in pigmentne paste je 4/1. Z dodatkom pigmentne paste je testirano tudi razmerje veziva in pigmentne paste 3/1. Mikrogela MG 1 in MG 2 sta bila dodana v različnih koncentracijah: 3, 6, 8 in 10 ut. %. Najprej so ovrednotene fizikalne lastnosti utrjenega kataforeznega epoksi premaza z dodatkom. Izbrani fizikalni testi so sijaj, elastičnost po Erichsenu, prevoj, udar in oprijem. Testiranje izboljšanih antikorozijskih lastnosti je potekalo s pomočjo klasičnega testiranja v slani komori po standardu ASTM B-117 in z novo vzpostavljeno metodo AC-DC-AC, ki temelji na elektrokemijski impedančni spektroskopiji. Vzpostavljena je bila korelacija med slano komoro in metodo AC-DC-AC. Za vzorce z razmerjem veziva in pigmentne paste 4/1, in to ne glede na vrsto mikrogela, ima korelacija 10,8-odstotno napako, za vzorce z razmerjem veziva in pigmentne paste 3/1 ne glede na vrsto mikrogela pa 6,3-odstotno napako. S testiranjem antikorozijskih lastnosti je potrjeno, da imata vzorca z razmerjem veziva in pigmentne paste 3/1 in dodatkom 8 ut. % MG 1 in 8 ut. % MG 2 izboljšano pokritost robov.

• Language: Slovenian
• Keywords: Kataforezni epoksi temeljni premaz, mikrogel, antikorozijske lastnosti, pokrivnost robov, slana komora, metoda AC-DC-AC
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2021
• PID: 20.500.12556/RUL-132182
• COBISS.SI-ID: 88607235
• Publication date in RUL: 15.10.2021

Secondary language

• Language: English
• Title: Evaluation of polymer functional additives on application properties of cataphoresis epoxy primer

Abstract

Edge coverage of cataphoretic epoxy primer on steel substrate was optimised with three different functional additives: pigment paste, microgel MG 1 and microgel MG 2. The binder to pigment paste ratio was 4/1 and with addition of pigment paste it was changed to 3/1. Various contents of each microgel separately were incorporated into the electrocoating bath: 3, 6, 8 and 10 wt. %. Gloss, elasticity by Erichsen, bending, impact resistance and adhesion were used to study the effect of additives on mechanical properties of cured coating. Salt spray test and AC-DC-AC method were used to study improved anti-corrosion properties of cured coating on the edges. A correlation between salt spray test and AC-DC-AC method was determined. The correlation error for samples with binder to pigment ratio 4/1 is 10.8% when MG 1 or MG 2 is added. The correlation error for samples with binder to pigment ratio 3/1 is 6.3% when MG 1 or MG 2 is added. The salt spray test and AC-DC-AC method proved that samples with binder to pigment paste ratio 3/1 and addition of 8 wt. % MG and or MG 2 show improved anti-corrosion properties on the edge.

• Keywords: cataphoretic epoxy primer, microgel, anti-corrosion properties, edge coverage, salt spray test, AC-DC-AC method