| 摘要 |
<p>A reaction resin system (I) contains (A) an epoxide component, (B) a hardener component contg. either cpds. (B1) and (B2 or B3) or (B2) or (B3), where (B1) is a carboxylic acid anhydride, (B2) is a phosphonic acid anhydride of formula Ä-(O)P(R)-O-Ün (I) (B3) is a phosphinic acid anhydride of formula (R<1>)(R)P(O)-O-P(O)(R<1>)(R) (II) (where R, R<1> = 1-40C alkyl or alkenyl or a cycloaliphatic or aryl gp., n = a whole no.). Also claimed is (i) a process for the prodn. of fire-resistant resin castings by mixing the above components and hardening the mixt. at elevated temp., (ii) fire resistant resin castings, coatings or sheathing made from (I) esp. for electrical and electronic components such as high-voltage components, transformers, chokes, condensers, relays and semiconductor components esp. support insulators in high-voltage transformer units. Pref. hardener (B) consists of a soln. of (B2) or (B3) in a di- or tetra-carboxylic acid anhydride (B1), which is liq. at least at the processing temp. of the system as a casting resin. (B1) is the anhydride of an aromatic or cycloaliphatic di- or tetra-carboxylic acid. The resin system may also contain other appropriate epoxy resin additives such as accelerators, reactive diluents, fillers, flow improvers, coupling agents, thixotropic agents, dyes and pigments. The prodn. of (I) comprises (i) prepn. of hardener (B) by dissolving (B2) or (B3) in (B1), (ii) mixing the soln. with a polyepoxy cpd. (A) contg. at least 2 epoxide gps. and opt. with additives/fillers (C) and (iii) hardening at elevated temp. The amt. of (B2) or (B3) used is such that the organic components have a phosphorus content of 0.5-10 (pref. 1-5) wt.%. The resin mixt. may be processed by pouring into a casting mould before hardening.</p> |
