Epoxy-elastomer low temperature curable, solventless, sprayable, stator winding adhesive-bracing compositions

Claim 2

A sprayable, solventless, crack resistant, flexible adhesive-bracing composition, useful for coating stator end windings, comprising the admixture of: (1) 100 parts by weight of diglycidyl ether of bisphenol A epoxy resin having an epoxy equivalent weight of between about 160 and about 260; (2) 0 to about 8 parts by weight of a coloring pigment; (3) about 0.5 to about 4.0 parts by weight of a thixotropic agent; (4) about 100 to about 200 parts by weight of a secondary amine terminated butadiene/acrylonitrile reactive liquid polymer having a 2-butenylene:cyanoethylene chain segment ratio of between about 3:1 and about 7:1, and a viscosity at 27° C. of between 150,000 cps. and 200,000 cps., and (5) about 20 to about 40 parts by weight of an amine terminated curing agent not containing cyanoethylene chain segments, to provide a solventless composition.

Claim 3

The solventless composition of claim 1, containing up to about 30 parts by weight of a diglycidyl ether of an aliphatic diol having from 2 to 12 carbon atoms and a viscosity between about 5 cps. to about 100 cps. at 25° C., up to about 40 parts by weight of a plasticizer, for the butadiene/acrylonitrile polymer, having a molecular weight of over about 200, and up to about 8 parts by weight of a BF 3 -amine complex co-curing agent.

Claim 4

The solventless composition of claim 1, where the thixotropic agent is SiO 2 , and has an average particle size of between about 0.005 micron to about 0.05 micron, and an external surface area of between about 50 square meters/gram and about 400 square meters/gram.

Claim 5

The solventless composition of claim 2, where the diglycidyl ether of an aliphatic diol is diglycidyl ether of neopentyl glycol.

Claim 6

The solventless composition of claim 1, where the coloring pigment is iron oxide.

Claim 7

The solventless composition of claim 1, where the amine terminated curing agent has one or more --CR 2 NHR' groups where R and R' are selected from H and alkyl groups having from 1 to 18 carbon atoms, having a molecular weight of between about 90 and about 2,000.

Claim 8

The solventless composition of claim 1, having a viscosity between about 15,000 cps. and about 60,000 cps. at 25° C., said composition being characterized as curable within about 10 hours at 25° C., the cured composition being flexible and crack resistant upon bending, for over about 250 days at 100° C.

Claim 9

A substrate coated with the solventless composition of claim 1.

Claim 10

A laminate comprising a plurality of substrate layers bonded with one or more layers of the solventless composition of claim 1 cured on and between the substrate layers.

Claim 11

A sprayable, solventless, crack resistant, flexible adhesive-bracing composition, useful for coating stator end windings, consisting essentially of the admixture of: (1) 100 parts by weight of diglycidyl ether of bisphenol A epoxy resin having an epoxy equivalent weight of between about 160 and about 260; (2) 0 to about 30 parts by weight of a diglycidyl ether of an aliphatic diol having from 2 to 12 carbon atoms and a viscosity of between about 5 cps. and about 100 cps. at 25° C.; (3) 0 to about 8 parts by weight of a coloring pigment; (4) about 0.5 to about 4.0 parts by weight of SiO 2 thixotropic agent; (5) about 100 to about 200 parts by weight of a secondary amine terminated butadiene/acrylonitrile reactive liquid polymer having a viscosity at 27° C. of between 150,000 cps. and 200,000 cps., and having the chemical formula: ##STR8## where x=3 to 7, y=1, and m=7 to 13; (6) 0 to about 40 parts by weight of a plasticizer for the butadiene/acrylonitrile polymer, having a molecular weight of over about 200; (7) about 20 to about 40 parts by weight of an amine terminated curing agent not containing cyanoethylene chain segments; and (8) 0 to about 8 parts by weight of a BF 3 -amine complex curing agent, to provide a solventless composition having a viscosity between about 15,000 cps. and about 60,000 cps. at 25° C.

Claim 12

A sprayable, solventless, crack resistant, flexible adhesive-bracing composition, useful for coating stator end windings, consisting essentially of the admixture of: (1) 100 parts by weight of diglycidyl ether of bisphenol A epoxy resin having an epoxy equivalent weight of between about 160 and about 260; (2) 0 to about 30 parts by weight of a diglycidyl ether of an aliphatic diol having from 2 to 12 carbon atoms and a viscosity of between about 5 cps. and about 100 cps. at 25° C.; (3) 0 to about 8 parts by weight of a coloring pigment; (4) about 0.5 to about 4.0 parts by weight of SiO 2 thixotropic agent; (5) about 100 to about 200 parts by weight of a secondary amine terminated butadiene/acrylonitrile reactive liquid polymer having a viscosity at 27° C. of between 150,000 cps. and 200,000 cps., and having the chemical formula: ##STR8## where x=3 to 7, y=1, and m=7 to 13; (6) 0 to about 40 parts by weight of a plasticizer for the butadiene/acrylonitrile polymer, having a molecular weight of over about 200; (7) about 20 to about 40 parts by weight of an amine terminated curing agent not containing cyanoethylene chain segments; and (8) 0 to about 8 parts by weight of a BF 3 -amine complex curing agent, to provide a solventless composition having a viscosity between about 15,000 cps. and about 60,000 cps. at 25° C.

Claim 13

A substrate coated with the solventless composition of claim 10.

Claim 14

A sprayable, solventless, crack resistant, flexible adhesive-bracing composition, useful for coating stator end windings, consisting essentially of the admixture of: (1) 100 parts by weight of diglycidyl ether of bisphenol A epoxy resin having an epoxy equivalent weight of between about 160 and 260; (2) about 5 to about 30 parts by weight of a diglycidyl ether of an aliphatic diol having from 2 to 12 carbon atoms and a viscosity between about 5 cps. to about 100 cps. at 25° C.; (3) about 4 to about 8 parts by weight of a Fe(III) oxide coloring pigment; (4) about 0.5 to about 4.0 parts by weight of SiO 2 thixotropic agent; (5) about 100 to about 200 parts by weight of a secondary amine terminated butadiene/acrylonitrile reactive liquid polymer having a viscosity at 27° C. of between 150,000 cps. and 200,000 cps., and having the chemical formula: ##STR9## where x=3 to 7, y=1, and m=7 to 13; (6) about 5 to about 40 parts by weight of a plasticizer for the butadiene/acrylonitrile polymer, having a molecular weight of over about 200; (7) about 20 to about 40 parts by weight of a fatty polyamide polyamide curing agent not containing cyanoethylene chain segments; and (8) about 2 to about 8 parts by weight of a BF 3 -amine complex curing agent, to provide a solventless composition having a viscosity between about 15,000 cps. and about 60,000 cps. at 25° C., said composition being characterized as curable within about 10 hours at 25° C., the cured composition being flexible and crack resistant upon bending, for over about 250 days at 100° C.

Claim 15

A sprayable, solventless, crack resistant, flexible adhesive-bracing composition, useful for coating stator end windings, consisting essentially of the admixture of: (1) 100 parts by weight of diglycidyl ether of bisphenol A epoxy resin having an epoxy equivalent weight of between about 160 and 260; (2) about 5 to about 30 parts by weight of a diglycidyl ether of an aliphatic diol having from 2 to 12 carbon atoms and a viscosity between about 5 cps. to about 100 cps. at 25° C.; (3) about 4 to about 8 parts by weight of a Fe(III) oxide coloring pigment; (4) about 0.5 to about 4.0 parts by weight of SiO 2 thixotropic agent; (5) about 100 to about 200 parts by weight of a secondary amine terminated butadiene/acrylonitrile reactive liquid polymer having a viscosity at 27° C. of between 150,000 cps. and 200,000 cps., and having the chemical formula: ##STR9## where x=3 to 7, y=1, and m=7 to 13; (6) about 5 to about 40 parts by weight of a plasticizer for the butadiene/acrylonitrile polymer, having a molecular weight of over about 200; (7) about 20 to about 40 parts by weight of a fatty polyamide polyamide curing agent not containing cyanoethylene chain segments; and (8) about 2 to about 8 parts by weight of a BF 3 -amine complex curing agent, to provide a solventless composition having a viscosity between about 15,000 cps. and about 60,000 cps. at 25° C., said composition being characterized as curable within about 10 hours at 25° C., the cured composition being flexible and crack resistant upon bending, for over about 250 days at 100° C.

Claim 16

A process comprising admixing: (A) a mixture of: (1) 100 parts by weight of diglycidyl ether of bisphenol A resin having an epoxy equivalent weight of between about 160 and about 260; (2) 0 to about 8 parts by weight of a coloring pigment; and (3) about 0.5 to about 4.0 parts by weight of a thixotropic agent, with (B) a mixture of: (1) about 100 to about 200 parts by weight of a secondary amine terminated butadiene/acrylonitrile reactive liquid polymer having a 2-butenylene:cyanoethylene chain ratio of between about 3:1 and about 7:1, and a viscosity at 27° C. of between 150,000 cps. and 200,000 cps., and (2) about 20 to about 40 parts by weight of an amine terminated curing agent not containing cyanoethylene chain segments, to provide a solventless adhesive-bracing composition having a viscosity between about 15,000 cps. and about 60,000 cps. at 25° C.

Claim 17

A process comprising admixing: (A) a mixture of: (1) 100 parts by weight of diglycidyl ether of bisphenol A resin having an epoxy equivalent weight of between about 160 and about 260; (2) 0 to about 8 parts by weight of a coloring pigment; and (3) about 0.5 to about 4.0 parts by weight of a thixotropic agent, with (B) a mixture of: (1) about 100 to about 200 parts by weight of a secondary amine terminated butadiene/acrylonitrile reactive liquid polymer having a 2-butenylene:cyanoethylene chain ratio of between about 3:1 and about 7:1, and a viscosity at 27° C. of between 150,000 cps. and 200,000 cps., and (2) about 20 to about 40 parts by weight of an amine terminated curing agent not containing cyanoethylene chain segments, to provide a solventless adhesive-bracing composition having a viscosity between about 15,000 cps. and about 60,000 cps. at 25° C.

Claim 18

The method of claim 13, where the thixotropic agent is SiO 2 , and has an average particle size of between about 0.005 micron to about 0.05 micron, and where the composition is applied to a substrate and cured at room temperature.