| 摘要 |
Disclosed is a highly reactive phenolic resole resin, the resin being obtained by reacting a substituted or unsubstituted phenol and an aldehyde in the presence of an alkaline catalyst at a temperature of no more than 65°C and then neutralizing to a pH of 5.5 - 6.6. Also disclosed is a pre-mix for a syntactic phenolic foam composition, the premix comprising: 1) thermally expandable and/or expanded thermoplastic microspheres, the microspheres comprising a thermoplastic polymer shell made of a homopolymer or copolymer of 100 to 25, for example 93 to 40, parts by weight of a nitrile-containing, ethylenically unsaturated monomer, or a mixture thereof; and 0 to 75, for example 7 to 60, parts by weight of a non-nitrile-containing, ethylenically unsaturated monomer, or a mixture thereof; and a propellant, or a mixture thereof, trapped within the thermoplastic polymer shell; and one of either 2) a highly reactive phenolic resole resin, the resin being obtainable by reacting a substituted or unsubstituted phenol and an aldehyde in the presence of an alkaline catalyst at a temperature of no more than 65°C and then neutralizing to a pH of 5.5 - 6.6; or 3) an acidic catalyst for curing the phenolic resole resin. Also disclosed is a syntactic phenolic foam composition, comprising all of the components 1), 2) and 3) above.
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