US 10,377,917 B2Granted

Process for preparing a coating

AssigneeAktiebolaget Skf

InventorsWarrick Allen, Ileana Nedelcu

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Abstract

A process for preparing a coating on at least part of a tribological surface of a first machine component which, during machine operation, is adapted to be in sliding contact with a tribological surface of a second machine component is provided. The process provides the steps of: (a) applying a polymer formulation onto at least part of the tribological surface of the first machine component to form a coating. The polymer formulation provides an isocyanate that contains two or more isocyanate groups per molecule and an idocyanate-reactive polyol to form polyurethanes; and (b) subjecting at least part of the coating as obtained in step (a) to a curing treatment during which polyurethanes are formed in the coating on the at least part of the tribological surface of the first machine component.

Claims20

Dependent claims

A process for preparing a coating on at least part of a tribological surface of a first machine component composed of nitrile butadiene rubber, styrene butadiene rubber or fluorocarbon rubber which, during machine operation, is adapted to be in sliding contact with a tribological surface of a second machine component, the process comprises:

(a) applying an aqueous polymer formulation onto at least part of the tribological surface of the first machine component to form a coating, the aqueous polymer formulation comprising a polyisocyanate and an acrylic polyol to form polyurethanes;
and
(b) subjecting at least part of the coating as obtained in step (a) to a curing treatment during which the polyurethanes are formed in the coating on the at least part of the tribological surface of the first machine component;
wherein the acrylic polyol is the only polyol in the aqueous polymer formulation;
the acrylic polyol has a weight average molecular weight of 500-3000 Daltons and is obtained by copolymerizing an acrylic monomer with a hydroxylated acrylic monomer;
the acrylic monomer is selected from the group consisting of ethyl acrylates (EA), butyl acrylates (BA), acrylic acid (AA), methyl methacrylate (MMA) and styrene (ST);
and
the hydroxylated acrylic monomer is selected from the group consisting of 2-hydroxyethyl acrylates (HEA) and 4-hydroxybutyl acrylates (HBA).

5 more elements

A machine component on which a coating is formed using a process for preparing a coating on at least part of a tribological surface of a first machine component composed of nitrile butadiene rubber, styrene butadiene rubber or fluorocarbon rubber which, during machine operation, is adapted to be in sliding contact with a tribological surface of a second machine component, the process comprises:

(a) applying an aqueous polymer formulation onto at least part of the tribological surface of the first machine component to form a coating, the aqueous polymer formulation comprising a polyisocyanate and an acrylic polyol to form polyurethanes;
and
(b) subjecting at least part of the coating as obtained in step (a) to a curing treatment during which the polyurethanes are formed in the coating on the at least part of the tribological surface of the first machine component;
wherein the acrylic polyol is the only polyol in the aqueous polymer formulation;
the acrylic polyol has a weight average molecular weight of 500-3000 Daltons and is obtained by copolymerizing an acrylic monomer with a hydroxylated acrylic monomer;
the acrylic monomer is selected from the group consisting of ethyl acrylates (EA), butyl acrylates (BA), acrylic acid (AA), methyl methacrylate (MMA) and styrene (ST);
and
the hydroxylated acrylic monomer is selected from the group consisting of 2-hydroxyethyl acrylates (HEA) and 4-hydroxybutyl acrylates (HBA).

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/221,130Filed 27 Jul 2016
Priority: GB 1513165.927 Jul 2015
Published: US 2017/0029661 A12 Feb 2017
Granted: 13 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

C09D 175/16
Polyurethanes having carbon-to-carbon unsaturated bonds: having terminal carbon-to-carbon unsaturated bonds
C08G 18/6216
Polymers of compounds having carbon-to-carbon double bonds: polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives…
C08G 18/792
Containing isocyanurate groups: formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
C10M 107/44
Containing nitrogen: macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds