US 10,723,083 B2Granted

Polyurethane bonding process for fuel bladders

AssigneeVinyl Technology, Inc.

InventorsDan Mollura, Dilip Shukla

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Abstract

A method of bonding a metal fitting to a polyurethane structure, the method comprising abrading a surface of the metal fitting with an abrasive; cleaning the metal fitting with a solvent; cleaning a surface of the polyurethane structure with an alcohol; applying a primer to the surface of the metal fitting; applying an adhesive to the surface of the metal fitting and the surface of the polyurethane structure; applying a liquid polyurethane compound to the surface of the metal fitting and the surface of the polyurethane structure; and pressing the surface of the metal fitting against the surface of the polyurethane structure to form an assembly. The primer can comprise a first resin and a first catalyst in a ratio of about 1.1 to 1; the adhesive can comprise a second resin and a second catalyst in a ratio of about 3 to 1; and the liquid polyurethane compound can comprise a third resin and a third catalyst in a ratio of about 10 to 1.

Claims20

Dependent claims

A method of bonding a metal fitting to a polyurethane structure, the method comprising:

abrading a surface of the metal fitting with an abrasive;
cleaning the metal fitting with a solvent;
cleaning a surface of the polyurethane structure with an alcohol;
applying a primer to the surface of the metal fitting, wherein the primer comprises a first resin and a first reactant in a weight ratio of about 1.1 to 1;
applying an adhesive to the surface of the metal fitting and the surface of the polyurethane structure, wherein the adhesive comprises a second resin and a second reactant in a weight ratio of about 3 to 1;
applying a liquid polyurethane compound to the surface of the metal fitting and the surface of the polyurethane structure, wherein the liquid polyurethane compound comprises a third resin and a third reactant in a weight ratio of about 10 to 1;
and
pressing the surface of the metal fitting against the surface of the polyurethane structure to form an assembly;
wherein the first resin comprises
from about 40% to about 70%, by weight, methyl ethyl ketone,
from about 10% to about 30%, by weight, isopropyl alcohol,
from about 10% to about 30%, by weight, trizinc bis(orthophosphate),
from about 1% to about 5%, by weight, phenol, and
from about 1% to about 5%, by weight, methanol;
wherein the first reactant comprises
from about 40% to about 70%, by weight, ethyl acetate,
from about 10% to about 30%, by weight, isopropyl alcohol, and
from about 1% to about 5%, by weight, phosphoric acid;
wherein the second resin comprises
from about 50% to about 60%, by weight, methyl ethyl ketone, and
from about 15% to about 40%, by weight, bisophenol A diglycidyl ether;
wherein the second reactant comprises
from about 70% to about 80%, by weight, methyl ethyl ketone, and
from about 1% to about 5%, by weight, 4,4-diphenylmethane diisocyanate;
wherein the third resin comprises from about 0.1% to about 1%, by weight, toluene diisocyanate;
and
wherein the third reactant comprises
from about 65% to about 85%, by weight, di(methylthio)toluenediamine, and
from about 15% to about 35%, by weight, glycol ether.

26 more elements

A method of bonding metal fittings to a polyurethane structure, the method comprising:

abrading a first surface of a first metal fitting and a second surface of a second metal fitting with an abrasive;
cleaning the first and second metal fittings with a solvent;
cleaning a first surface of the polyurethane structure and a second surface of the polyurethane structure with an alcohol;
applying a primer to the first surface of the first metal fitting and the second surface of the second metal fitting, wherein the primer comprises a first resin and a first reactant in a weight ratio of about 1.1 to 1;
applying an adhesive to the first surface of the first metal fitting, the second surface of the second metal fitting, and the first and second surfaces of the polyurethane structure, wherein the adhesive comprises a second resin and a second reactant in a weight ratio of about 3 to 1;
applying a liquid polyurethane compound to the first surface of the first metal fitting, the second surface of the second metal fitting, and the first and second surfaces of the polyurethane structure, wherein the liquid polyurethane compound comprises a third resin and a third reactant in a weight ratio of about 10 to 1;
and
pressing the first surface of the first metal fitting against the first surface of the polyurethane structure and the second surface of the second metal fitting against the second surface of the polyurethane structure to form an assembly;
wherein the first resin comprises
from about 40% to about 70%, by weight, methyl ethyl ketone,
from about 10% to about 30%, by weight, isopropyl alcohol,
from about 10% to about 30%, by weight, trizinc bis(orthophosphate),
from about 1% to about 5%, by weight, phenol, and
from about 1% to about 5%, by weight, methanol;
wherein the first reactant comprises
from about 40% to about 70%, by weight, ethyl acetate,
from about 10% to about 30%, by weight, isopropyl alcohol, and
from about 1% to about 5%, by weight, phosphoric acid;
wherein the second resin comprises
from about 50% to about 60%, by weight, methyl ethyl ketone, and
from about 15% to about 40%, by weight, bisophenol A diglycidyl ether;
wherein the second reactant comprises
from about 70% to about 80%, by weight, methyl ethyl ketone, and
from about 1% to about 5%, by weight, 4,4-diphenylmethane diisocyanate;
wherein the third resin comprises from about 0.1% to about 1%, by weight, toluene diisocyanate;
and
wherein the third reactant comprises
from about 65% to about 85%, by weight, di(methylthio)toluenediamine, and
from about 15% to about 35%, by weight, glycol ether.

26 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/976,162Filed 10 May 2018 · us provisional application
Priority: 10 May 2017
Published: US 2018/0326673 A115 Nov 2018
Granted: 28 Jul 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification36 codes

B29C 65/52
Using adhesives , i.e. using supplementary joining material; solvent bonding: characterised by the way of applying the adhesive
B29C 65/485
Reactive adhesives, e.g. chemically curing adhesives: multi-component adhesives, i.e. chemically curing as a result of the mixing of said…
B29C 66/02245
With removal of material: abrading, e.g. grinding, sanding, sandblasting or scraping
B29C 66/026
Preparation of the material, in the area to be joined, prior to joining or welding: chemical pre-treatments