ABSTRACT
Polysulfide Oligomers .................................................................... 71 Keywords ................................................................................................ 85 References ............................................................................................... 85
2.1 INTRODUCTION
PSO-based composite materials (sealants), both single-component and two-component, usually contain the following components (below are listed the most widespread ones):
1. PSO – liquid thiokols or thiol-containing polyesters 2. plasticizers – dibutylphthalate, chloroparaffin, benzylbutylphthal-
ate, etc. 3. fillers – chalk (natural occurring, chemically precipitated, or hy-
drophobic), kaolin, carbon black, titanium dioxide 4. thixotropic additives – aerosils, bentonits, hydrogenated castor oil 5. adhesive additives – epoxy resins, alkylphenolformaldehyde res-
ins, functional trialkoxysilanes 6. promoters – sulfur, diphenylguanidine, thiuram, etc. 7. retarders – oleic, stearic or isostearic acids, metal stearates 8. drying agents (for single-component compositions) – ceolites, bar-
ium oxides 9. pigments – carbon black, titanium dioxide 10. vulcanizing agents – manganese and lead dioxides, sodium bichro-
mate, sodium perborate monohydrate, calcium peroxide There are lots of formulations for various applications, operating con-
ditions coating technologies, etc. Basic principles of making compositions of sealants and their correlation with properties will be described below in this chapter using information from literature sources and by examples of author’s research in chapters below.
