Ultraviolet curing anticorrosive coating

A technology of anti-corrosion coatings and ultraviolet light, which is applied in the direction of anti-corrosion coatings and coatings, and can solve problems affecting the health of operators, stimulation, and viscosity reduction

Active Publication Date: 2014-12-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the epoxy acrylate oligomer or urethane acrylate oligomer added in these two patents has a high viscosity and is difficult to construct. Therefore, it is necessary to add a large amount of small molecule acrylate or methacrylate monomer as a reactive diluent. Lower viscosity for easier application
These reactive diluents have a strong stimulating effect on human skin and eyes, affect the health of operators, and cause serious occupational hazards; and some reactive diluents are difficult to completely react during the UV curing process, and remain in the cured film. The monomer in the film will directly affect the weather resistance of the film

Method used

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preparation example Construction

[0063] Correspondingly, the preparation method of the UV-curable anticorrosion coating comprises the following steps: mixing and stirring 16-30 parts by weight of water-based UV-curable oligomer and 0.3-5 parts by weight of water-based polyaniline, adding 20-38 parts by weight of The pigment, 6-21 parts by weight of filler, and 0.5-7 parts by weight of photoinitiator are sand-milled to obtain an ultraviolet-curable anticorrosion coating.

[0064] Among them, the water-based UV-curable oligomer has unsaturated bonds to form a dense coating after UV-curing, and the oxidation-reduction potential of the phosphate-doped water-based polyaniline is 0.5~0.7V vs. SCE is higher than the intrinsic state The oxidation-reduction potential of polyaniline makes it easier to oxidize the surface of steel to form a dense metal oxide film.

[0065] According to the present invention, the preparation method of the UV-curable anticorrosion coating preferably also adds 2 to 8 parts by weight of wat...

Embodiment 1

[0072] The preparation of embodiment 1 waterborne polyurethane acrylate oligomer

[0073] 1.1 Under the protection of dry nitrogen, add 200g of polybutylene adipate with a molecular weight of 2kDa and 100g of polypropylene glycol with a molecular weight of 1kDa after vacuum dehydration into a three-necked flask, and raise the temperature to 85°C. 226.2 g of 2,4-toluene diisocyanate was added dropwise at a high speed, and after the dropwise addition was completed, the reaction was continued for 2 hours to obtain the first intermediate product.

[0074] 1.2 After cooling the first intermediate product obtained in 1.1 to 70°C, add 150ml butanone, 40.2g 2,2-dimethylolpropionic acid and 0.0001g dibutyltin dilaurate, and react for 1.5h to obtain the second intermediate product.

[0075] 1.3 Warm up the second intermediate product obtained in 1.2 to 65°C, add 178.9g of pentaerythritol triacrylate, react for 2 hours, add 200ml of deionized water to emulsify for 20min, add 24.2g of tr...

Embodiment 2

[0076] The preparation of embodiment 2 waterborne epoxy acrylate oligomers

[0077] 2.1 Under the protection of nitrogen, slowly heat 120g of bisphenol A epoxy resin E44 and 0.06g of hydroquinone to 70°C, add a mixture of 76.1g of acrylic acid and 0.93g of triethylamine dropwise at a rate of 6ml / min, and then heat up To 90°C, react for 2.5h to obtain epoxy acrylate oligomer.

[0078] 2.2 Cool down the epoxy acrylate oligomer obtained in 2.1 to 70°C, add 0.02g of hydroquinone, 0.23g of tetrabutylammonium bromide and 103.5g of maleic anhydride, heat to 75°C, and react 2h, lower the temperature to 40°C, add 130g of deionized water under the condition of stirring at a rotating speed of 800rpm / min, stir for 20min, then add 86g of triethylamine, and continue stirring for 30min to obtain a water-based epoxy acrylate oligomer.

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Abstract

The invention provides an ultraviolet curing anticorrosive coating. The coating comprises the following components in parts by weight: 16-30 parts of water-based ultraviolet curing oligomer, 0.3-5 parts of water-based polyaniline, 0.5-7 parts of photoinitiator, 20-38 parts of pigment and 6-21 parts of filler. Compared with the solvent type ultraviolet curing polyaniline anticorrosive coating of the prior art, the ultraviolet curing anticorrosive coating provided by the invention adopts water-based ultraviolet curing oligomer and water-based polyaniline, wherein the water-based ultraviolet curing oligomer has a dense coating made from unsaturated bonds by ultraviolet curing; and the oxidation-reduction potential of the water-based polyaniline is higher than that of iron, thus the surface of steel and iron is easily oxidized to form a dense metal oxide film. In the invention, no organic solvent or reactive diluent is added, and the influence on the long-term performance of the film caused by the residues in the curing film is avoided; and moreover, the ultraviolet curing anticorrosive coating is nontoxic and non-irritant to operators to avoid occupational injury, and any environmental pollution is prevented.

Description

technical field [0001] The invention belongs to the technical field of metal anticorrosion coatings, and in particular relates to an ultraviolet curing anticorrosion coating. Background technique [0002] UV-curable coating is an environmentally friendly and energy-saving coating developed in the 1960s. Its principle is to use the energy of ultraviolet light to trigger the interaction between low-molecular prepolymers or oligomers in the coating and monomer molecules as reactive diluents. Polymerization and crosslinking reaction to obtain a hardened paint film. Since the commercialization of UV-curable coatings in the 1970s, due to its fast curing speed, less use of volatile solvents, high efficiency and energy saving, the curing process can be automated and suitable for continuous large-scale production, it has always maintained 8~10% It is widely used in industrial production fields such as wood coating, plastic decoration, medical equipment, electronic components, inform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C08G18/76C08G18/67C08G18/66C08G59/17C08G59/14C09D4/02C09D4/06C09D7/12C09D5/08
Inventor 张红明李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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