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US 5,294,649 AGranted
Accelerators for curing phenolic resole resins
AssigneeBorden, Inc.
InventorArthur H. Gerber
Life of this patent
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Abstract
There are disclosed methods and compositions for accelerating the hardening of phenolic resole resins having a pH of about 4.5 to 9.5 with lightburned magnesium oxide or magnesium hydroxide, with or without the addition of an ester functional hardening agent. Acceleration of hardening is achieved by incorporating into said compositions an effective quantity of a material which: increases the solubility of magnesium in the hardenable mixture; by certain amines; or by certain chelating agents. Accelerator compounds include those which provide chloride, sulfamate, nitrate, formate, and phosphite anions as well as selected tertiary amines.
Claims20
A raw batch composition comprising a mixture of:
- A. an aggregate material;
- B. a hardenable phenolic resole resin having a pH of about 5 to 9, a resin solids content of about 50% to 90% by weight of said resin, and a viscosity of about 100 to 4,000 cps at 25.degree. C.;
- C. from about 5% to 40% by weight of the resin of a magnesium hardening agent selected from the group consisting of magnesium hydroxide and lightburned magnesium oxide, said magnesium oxide having a surface area of at least 10 square meters per gram;
- D. an accelerator in an amount sufficient to accelerate the hardening of said mixture, said accelerator selected from the group consisting of:
- (a) a 2,4-di(dialkylaminomethyl)phenol, a 2,6-di(dialkylaminomethyl)phenol, or a 2,4,6-tris(dialkylaminomethyl)phenol wherein each alkyl group has from 1 to 3 carbon atoms;
- (b) a 1,3,5-tri(lower alkyl)hexahydro-1,3,5-triazine wherein each alkyl group has from 1 to 3 carbon atoms;
- (c) 1,4-diazabicyclo[2.2.2]octane;
- and
- (d) a compound of the formula:
- ##STR5## wherein:
- each of R.sup.1 and R.sup.2 is a member selected from the group consisting of alkyl having 1 to 3 carbon atoms, and R.sup.1 and R.sup.2 when taken together with the nitrogen to which they are attached, represent a member selected from the group consisting of piperidino, piperazino, morpholino, thiomorpholino, and pyrrolidino;
- X is a member selected from the group consisting of (--CH.sub.2 --).sub.n wherein n is an integer of 1 to 6, --CH.dbd.CH--CH.sub.2 --, --CH.sub.2 --CH.dbd.CH--CH.sub.2 --, ##STR6## and each of R.sup.3 and R.sup.4 is a member selected from the group consisting of hydrogen, alkyl of 1 to 3 carbon atoms, and R.sup.3 and R.sup.4 when taken together with the nitrogen to which they are attached represent a member selected from the group consisting of piperazino, morpholino, thiomorpholino, piperidino, and pyrrolidino.
9 more elements
A raw batch composition comprising a mixture of:
- A. an aggregate material;
- B. a hardenable phenolic resole resin having a pH of about 4.5 to 9.5, a solids content of about 50% to 90% by weight of the resin, and a viscosity of about 100 to 4,000 cps at 25.degree. C.;
- C. from about 5% to 50% by weight of the resin of lightburned magnesium oxide having a surface area of at least about 10 square meters per gram;
- and
- D. from about 0.5% to 5% by weight of the resin of an accelerator compound which has a water solubility of at least 1% by weight at 25.degree. C. and provides to the mixture an accelerator selected from the group consisting of:
- (a) a 2,4-di(dialkylamonomethyl)phenol, a 2,6-di(dialkylaminomethyl)phenol, or a 2,4,6-tris(dialkylaminomethyl)phenol wherein each alkyl group has from 1 to 3 carbon atoms;
- (b) a 1,3,5-tri(lower alkyl)hexahydro-1,3,5-triazine wherein each alkyl group has from 1 to 3 carbon atoms;
- (c) 1,4-diazabicyclo[2.2.2]octane;
- and
- (d) a compound of the formula:
- ##STR8## each of R.sup.1 and R.sup.2 is a member selected from the group consisting of alkyl having 1 to 3 carbon atoms, and R.sup.1 and R.sup.2 when taken together with the nitrogen to which they are attached, represent a member selected from the group consisting of piperidino, piperazino, morpholino, thiomorpholino, and pyrrolidino;
- X is a member selected from the group consisting of (--CH.sub.2 --).sub.n wherein n is an integer of 1 to 6, --CH.dbd.CH--CH.sub.2 --, --CH.sub.2 --CH.dbd.CH--CH.sub.2 --, ##STR9## each of R.sup.3 and R.sup.4 is a member selected from the group consisting of hydrogen, alkyl of 1 to 3 carbon atoms, and R.sup.3 and R.sup.4 when taken together with the nitrogen to which they are attached represent a member selected from the group consisting of piperazino, morpholino, thiomorpholino, piperidino, and pyrrolidino.
9 more elements
Dependencies are inferred from the claim text.