Preparation method of epoxy non-isocyanate polyurethane heavy anti-corrosion coating

Abstract

The invention discloses a preparation method of an epoxy non-isocyanate polyurethane heavy anti-corrosion coating comprising a component A and a component B. The component A is a mixture of a cyclic-carbonate-terminated compound and an epoxy-terminated compound; the component B is amine-terminated polyether which is one or a mixture of amine-terminated polyether D-230, D-400 and T-403; and the mass ratio of the component A to the component B is (2.1-1):1. The components A and B of the epoxy non-isocyanate polyurethane heavy anti-corrosion coating are stored independently, and the shelf life of the components A and B is longer than half a year at a room temperature; the usage period of the mixture of the components A and B is longer than 1 hour; and after the coating is solidified for half a hour at 100 DEG C, the peeling strength of the coating can reach a maximum value of 40%, or after the coating is solidified for 7 days at a room temperature, the peeling strength of the coating can reach the maximum value.

Description

technical field

[0001] The invention belongs to the field of polymer materials, and in particular relates to an epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating. Background technique

[0002] Polyurethane coatings have the advantages of excellent adhesion, good mechanical properties, good chemical corrosion resistance, outstanding wear resistance, and low-temperature curing, and are widely used in various fields. However, currently commercially available polyurethane coatings have defects such as difficulty in controlling the content of free isocyanate groups, sensitivity to environmental moisture, poor construction performance and storage stability, and easy foaming of the paint film.

[0003] Wang Enqing et al. used epoxy-terminated polyurethane resin and amino-terminated polyurethane resin to prepare solvent-free epoxy polyurethane coatings, relying on epoxy groups and amino groups to cure and form films, and overcome the formation of CO due to the reac...

Examples

Embodiment 1

[0033] Add 340g of bisphenol F epoxy resin NPEF-170 and 3.4g of tetrabutylammonium bromide into a 500ml autoclave, and feed CO 2 When the pressure in the kettle reaches 1.5 MPa, heat to 115° C. and react for 6 hours to obtain a mixture of ring-terminated carbonate compound and epoxy compound, wherein the conversion rate of epoxy group to cyclocarbonate group is 41%.

[0034] Take 37.6g of the product from the previous step and 19.8g of amino-terminated polyether T-403 into a high-speed mixer, stir evenly, and spray evenly on the surface of the test piece to prepare a high-hardness epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating.

Embodiment 2

[0036] Add 340g of bisphenol F epoxy resin NPEF-170 and 3.4g of tetraethylammonium bromide into a 500ml autoclave, and feed CO 2 When the pressure in the kettle reaches 1.5 MPa, heat to 120° C. and react for 9 hours to obtain a mixture of ring-terminated carbonate compound and epoxy compound, wherein the conversion rate of epoxy group to cyclocarbonate group is 55%.

[0037] Take 38.8g of the product from the previous step and 18.6g of amino-terminated polyether D-230 into a high-speed mixer, stir evenly, and spray evenly on the surface of the test piece to prepare an epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating with moderate hardness.

Embodiment 3

[0039] Add 340g of bisphenol F epoxy resin NPEF-170 and 3.4g of cetyltrimethylammonium chloride into a 500ml autoclave, and feed CO 2 When the pressure in the kettle reaches 2.1MPa, heat to 130°C and react for 10 hours to obtain a mixture of ring-terminated carbonate group compound and epoxy compound, wherein the conversion rate of epoxy group to cyclocarbonate group is 70%.

[0040] Take 40g of the product from the previous step, 3g of glycerol triglycidyl ether, and 36g of amino-terminated polyether D400 and put them into a high-speed mixer. After stirring evenly, spray evenly on the surface of the test piece to prepare a flexible epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating.

technical field

[0001] The invention belongs to the field of polymer materials, and in particular relates to an epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating. Background technique

[0002] Polyurethane coatings have the advantages of excellent adhesion, good mechanical properties, good chemical corrosion resistance, outstanding wear resistance, and low-temperature curing, and are widely used in various fields. However, currently commercially available polyurethane coatings have defects such as difficulty in controlling the content of free isocyanate groups, sensitivity to environmental moisture, poor construction performance and storage stability, and easy foaming of the paint film.

[0003] Wang Enqing et al. used epoxy-terminated polyurethane resin and amino-terminated polyurethane resin to prepare solvent-free epoxy polyurethane coatings, relying on epoxy groups and amino groups to cure and form films, and overcome the formation of CO due to the reac...

Examples

Embodiment 1

[0033] Add 340g of bisphenol F epoxy resin NPEF-170 and 3.4g of tetrabutylammonium bromide into a 500ml autoclave, and feed CO 2 When the pressure in the kettle reaches 1.5 MPa, heat to 115° C. and react for 6 hours to obtain a mixture of ring-terminated carbonate compound and epoxy compound, wherein the conversion rate of epoxy group to cyclocarbonate group is 41%.

[0034] Take 37.6g of the product from the previous step and 19.8g of amino-terminated polyether T-403 into a high-speed mixer, stir evenly, and spray evenly on the surface of the test piece to prepare a high-hardness epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating.

Embodiment 2

[0036] Add 340g of bisphenol F epoxy resin NPEF-170 and 3.4g of tetraethylammonium bromide into a 500ml autoclave, and feed CO 2 When the pressure in the kettle reaches 1.5 MPa, heat to 120° C. and react for 9 hours to obtain a mixture of ring-terminated carbonate compound and epoxy compound, wherein the conversion rate of epoxy group to cyclocarbonate group is 55%.

[0037] Take 38.8g of the product from the previous step and 18.6g of amino-terminated polyether D-230 into a high-speed mixer, stir evenly, and spray evenly on the surface of the test piece to prepare an epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating with moderate hardness.

Embodiment 3

[0039] Add 340g of bisphenol F epoxy resin NPEF-170 and 3.4g of cetyltrimethylammonium chloride into a 500ml autoclave, and feed CO 2 When the pressure in the kettle reaches 2.1MPa, heat to 130°C and react for 10 hours to obtain a mixture of ring-terminated carbonate group compound and epoxy compound, wherein the conversion rate of epoxy group to cyclocarbonate group is 70%.

[0040] Take 40g of the product from the previous step, 3g of glycerol triglycidyl ether, and 36g of amino-terminated polyether D400 and put them into a high-speed mixer. After stirring evenly, spray evenly on the surface of the test piece to prepare a flexible epoxy non-isocyanate polyurethane heavy-duty anti-corrosion coating.

Images