Super-anticorrosive polyurea protective paint as well as preparation method and application thereof

Abstract

The invention discloses a super anti-corrosion polyurea protective paint. The coating is prepared from polyaspartic acid ester resin, a polyisocyanate curing agent, polyether modified polydimethyloxane, nanoscale graphene, a dispersing agent, a defoaming agent, a flatting agent, an ultraviolet light absorber, pigment, filler and a solvent. According to the invention, the polyaspartic acid ester resin is used as main body resin, so that good aging resistance and medium resistance are achieved; the polyether modified polydimethylsiloxane enables the surface tension of a coating film to be changed, so that the adhesive force of the paint film is greatly improved; and due to the addition of the nanoscale graphene, the corrosion resistance of the paint film is enhanced. At present, a major breakthrough has been made in use of polyurea products on automobiles, the polyurea products are used in large quantities, and the excellent film coating performance and good manufacturability of the polyurea products have higher popularization value in other coating markets such as automobiles.

Description

Technical Field

[0001] This invention belongs to the technical field of anti-corrosion and protective paint production process, and relates to a super anti-corrosion polyurea protective paint coating composed of polyaspartic acid ester resin, polyisocyanate curing agent, polyether modified polydimethyloxane, nano-scale graphene, dispersant, defoamer, leveling agent, ultraviolet absorber, pigment, filler and solvent, and its preparation method. Background Technology

[0002] Since the advent of the 21st century, scholars both domestically and internationally have begun in-depth research and improvement of polyurea materials. Companies such as China Feiyang Chemical and Nanjing Mianju New Materials have successively developed aspartic polyurea series products. The research and development direction of polyurea coatings for automotive parts addresses the current problem of poor corrosion resistance and frequent need for rework in automotive coatings. While meeting the requirements of paint film performance and coating processes, it aims to achieve energy conservation and emission reduction, lower coating costs, and improved anti-corrosion effect, aging resistance, and media resistance. This invention, a super-corrosion-resistant polyurea protective paint, successfully solves the problem of poor corrosion resistance in automotive parts and can meet the improved anti-corrosion performance required in high-end coating fields. Summary of the Invention

[0003] This invention improves the anti-corrosion effect, anti-aging properties, and media resistance of polyurea protective paint by adding nano-scale graphene and polyether-modified polydimethyloxane.

[0004] To achieve the above objectives, the present invention discloses the following technical contents; A super anti-corrosion polyurea protective paint, with the following raw material composition by weight: (1) Preparation of paint paste

[0005] (2) Dilution treatment of dispersant

[0006] (3) Dilution treatment of polyether modified polydimethylsiloxane

[0007] (4) Dilution treatment of defoamer

[0008] (5) Harmony

[0009] (6) Dilution treatment of leveling agent

[0010] (7) Dilution treatment of ultraviolet absorber

[0011] (8) Preparation of hardener (main agent: hardener = 100:20)

[0012] (1) Dilution treatment of dispersant: Add dispersant F350 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (2) Dilution treatment of polyether modified polydimethylsiloxane: Add polyether modified polydimethylsiloxane BYK333 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use. (3) Dilution treatment of defoamer: Add defoamer B352 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (4) Preparation of paint slurry: Add 3563 / 64% polyurea resin to a stainless steel basin and stir at a low speed of 300-500 rpm. Then add diluent xylene: butyl acetate = 7:3 and stir for 10 minutes. Then slowly add dispersant F350 and polyether modified polydimethylsiloxane BYK333 and stir for 10 minutes. Then adjust the stirring speed to 1000-1200 rpm and add bentonite HY-2, precipitated barium sulfate 1250 mesh, carbon black QW105, nano-scale graphene, and talc powder 3000 mesh in sequence and stir for 20 minutes. Then adjust the stirring speed to 300-500 rpm and add defoamer B352 and stir for 15 minutes. Use a horizontal grinder to grind the paint slurry twice to grind the fineness of the paint slurry to ≤30μm, and filter it for later use. (5) Dilution of leveling agent: Add leveling agent L37 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (6) Dilution of UV absorber: Add UV absorber UV-1130 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use. (7) Mixing: Add the filtered paint slurry to the mixing tank, stir at a low speed of 300-500 rpm, then add the thinner xylene: butyl acetate = 7:3 and stir for 10 minutes. Slowly add leveling agent L37, polyaspartic polyurea resin F420, ultraviolet absorber UV-1130, and ultraviolet absorber UV-292 in sequence and stir for 30 minutes. Afterwards, test the paint slurry data. After all performances are qualified, use a filter press for packaging.

[0013] (8) Preparation of hardener: Add polyisocyanate HT100 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene: butyl acetate = 7:3 and stir for 15 minutes before use. Example

[0014] (1) Preparation of paint paste

[0015] (2) Dilution treatment of dispersant

[0016] (3) Dilution treatment of polyether modified polydimethylsiloxane

[0017] (4) Dilution treatment of defoamer

[0018] (5) Harmony

[0019] (6) Dilution treatment of leveling agent

[0020] (7) Dilution treatment of ultraviolet absorber

[0021] (8) Preparation of hardener (main agent: hardener = 100:20)

[0022] (1) Dilution treatment of dispersant: Add dispersant F350 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (2) Dilution treatment of polyether modified polydimethylsiloxane: Add polyether modified polydimethylsiloxane BYK333 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use. (3) Dilution treatment of defoamer: Add defoamer B352 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (4) Preparation of paint slurry: Add 3563 / 64% polyurea resin to a stainless steel basin and stir at a low speed of 300-500 rpm. Then add diluent xylene: butyl acetate = 7:3 and stir for 10 minutes. Then slowly add dispersant F350 and polyether modified polydimethylsiloxane BYK333 and stir for 10 minutes. Then adjust the stirring speed to 1000-1200 rpm and add bentonite HY-2, precipitated barium sulfate 1250 mesh, carbon black QW105, nano-scale graphene, and talc powder 3000 mesh in sequence and stir for 20 minutes. Then adjust the stirring speed to 300-500 rpm and add defoamer B352 and stir for 15 minutes. Use a horizontal grinder to grind the paint slurry twice to grind the fineness of the paint slurry to ≤30μm, and filter it for later use. (5) Dilution of leveling agent: Add leveling agent L37 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (6) Dilution of UV absorber: Add UV absorber UV-1130 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use. (7) Mixing: Add the filtered paint slurry to the mixing tank, stir at a low speed of 300-500 rpm, then add the thinner xylene: butyl acetate = 7:3 and stir for 10 minutes. Slowly add leveling agent L37, polyaspartic polyurea resin F420, ultraviolet absorber UV-1130, and ultraviolet absorber UV-292 in sequence and stir for 30 minutes. Afterwards, test the paint slurry data. After all performances are qualified, use a filter press for packaging.

[0023] (8) Preparation of hardener: Add polyisocyanate HT100 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene: butyl acetate = 7:3 and stir for 15 minutes before use.

[0024] Main technical parameters:

[0025]

[0026] Conclusion: This invention provides a super-corrosion-resistant polyurea protective coating. By incorporating nano-scale graphene and polyether-modified polydimethylsiloxane, the coating film exhibits over 3000 hours of salt spray resistance, 2500 hours of weather resistance, and over 3000 hours of acid and alkali resistance. This product can adapt to the production rhythm of various automotive parts, significantly improving various performance aspects and enhancing the core competitiveness of automakers. Furthermore, polyurea automotive coatings inherently possess good wetting properties due to their smaller molecular weight, and their thinners are primarily hydrocarbon-based. Therefore, they can be used in conjunction with epoxy topcoats to further enhance the anti-corrosion performance of the coating film, with acrylic polyurethane topcoats to improve weather resistance, or with alkyd paints to enhance the decorative properties of the coating film.

Claims

1. A super corrosion-resistant and cold / hot water circulation pipe inner wall protective paint, characterized in that, It is composed of the following raw materials in parts by weight: (1) Preparation of paint paste Composition by weight Polyurea resin 3563 / 64% 40 Xylene: Butyl acetate 7:35 Dispersant F350 0.3 Polyether-modified polydimethylsiloxane BYK333 0.3 Bentonite HY-2 1 Nanoscale graphene 3 Precipitated barium sulfate 1250 mesh 10 Carbon black QW105 3 Defoamer B352 0.3 3000 mesh talc (2) Dilution treatment of dispersant Dispersant F350 50 xylene 50 (3) Dilution treatment of polyether modified polydimethylsiloxane Polyether-modified polydimethylsiloxane BYK333 50 xylene 50 (4) Dilution treatment of defoamer Defoamer B352 50 xylene 50 (5) Harmony Xylene:Butyl acetate = 7:3 5 Leveling agent L37 0.3 Polyaspartic polyurea resin F420 20 UV absorber UV-1130 0.8 UV absorber UV-292 1 (6) Dilution treatment of leveling agent Leveling agent L37 50 xylene 50 (7) Dilution treatment of ultraviolet absorber UV absorber UV-1130 50 xylene 50 UV absorber UV-292 50 xylene 50 (8) Preparation of hardener (main agent: hardener = 100:20) Polyisocyanate HT100 60 Xylene 28 Butyl acetate 12.

2. The preparation method of the super-corrosion-resistant polyurea protective paint according to claim 1, characterized in that... Follow these steps: (1) Dilution treatment of dispersant: Add dispersant F350 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (2) Dilution treatment of polyether modified polydimethylsiloxane: Add polyether modified polydimethylsiloxane BYK333 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use. (3) Dilution treatment of defoamer: Add defoamer B352 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (4) Preparation of paint slurry: Add 3563 / 64% polyurea resin to a stainless steel basin and stir at a low speed of 300-500 rpm. Then add diluent xylene: butyl acetate = 7:3 and stir for 10 minutes. Then slowly add dispersant F350 and polyether modified polydimethylsiloxane BYK333 and stir for 10 minutes. Then adjust the stirring speed to 1000-1200 rpm and add bentonite HY-2, precipitated barium sulfate 1250 mesh, carbon black QW105, nano-scale graphene, and talc powder 3000 mesh in sequence and stir for 20 minutes. Then adjust the stirring speed to 300-500 rpm and add defoamer B352 and stir for 15 minutes. Use a horizontal grinder to grind the paint slurry twice to grind the fineness of the paint slurry to ≤30μm, and filter it for later use. (5) Dilution of leveling agent: Add leveling agent L37 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use; (6) Dilution of UV absorber: Add UV absorber UV-1130 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene and stir for 15 minutes before use. (7) Mixing: Add the filtered paint slurry to the mixing tank, stir at a low speed of 300-500 rpm, then add the thinner xylene: butyl acetate = 7:3 and stir for 10 minutes; slowly add the leveling agent L37, polyaspartic polyurea resin F420, ultraviolet absorber UV-1130, and ultraviolet absorber UV-292 in sequence and stir for 30 minutes; then test the paint slurry data. After all the performance is qualified, use a filter machine for packaging. (8) Preparation of hardener: Add polyisocyanate HT100 to a stainless steel basin, stir at a low speed of 300-500 rpm, then add xylene: butyl acetate = 7:3 and stir for 15 minutes before use.

3. The application of the ultra-corrosion resistant polyurea protective coating as described in claim 1 in improving the corrosion resistance and anti-aging properties of automotive parts.

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