Ecological isophthalic polyester gelcoat
Polimery 1994, No 9, 546
The effect of an additive reducing the evaporation of styrene, namely of the Stopvol hydroxyester, on the quality characteristics of gelcoat prepared from Polimal 120, an unsaturated isophthalic polyester resin, has been investigated. It was found that the addition of 1% hydroxyester reduces by 97% the evaporation of styrene from the gelcoat surface during the processing operations (cf. table 1). The effect of Stopvol on the interlaminar adhesion at the gelcoat—laminate and at the gelcoat—substrate boundaries was evaluated. In the presence of Stopvol a relatively easy manual detachment of the gelcoat from the substrate is possible, where as in no sample a delamination at the gelcoat—laminate boundary was observed. No negative effect of Stopvol on the appearance of the surface of detached gelcoat was observed. The effect of the presence of 1% hydroxyester on chemical resistance of gelcoat to the action of 30% sulphuric acid, 10% NaOH, 10% NaCl, distilled water and diesel oil was investigated. The modifier does not weaken the resistance of gelcoat to the action of these chemical media (cf. table 2). Gelcoat repared from Polimal 120 resin with Stopvol added exhibits similar physical and mechanical properties to those of an imported gelcoat and is characterized by high impact strength and good thermal resistance (cf. table 3).
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