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A kind of modified epoxy resin and its preparation method and cathodic electrophoretic coating with high throwing power
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A technology of epoxy resin and epoxy resin emulsion, used in electrophoretic coatings, anti-corrosion coatings, polyurea/polyurethane coatings, etc. The effect of permeability performance and process stability
Active Publication Date: 2020-10-30
KEDE CHEM IND SHUNDE +1
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The cathodic electrophoretic coating containing the polyurethane modified epoxy resin has excellent weather resistance, and has improved the fullness of the paint film, but its throwing power (four-box method) is 50-53%, which still cannot meet the requirements well. Uniform coating capability on all surfaces of complex substrates
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Embodiment 1～3
[0040] Embodiment 1~3, modified epoxy resin of the present invention and preparation thereof
[0041] The formulations of the modified epoxy resins of Examples 1 to 3 of the present invention are shown in Table 1 below.
[0042] The formula of table 1 embodiment 1~3 modified epoxy resin
[0043]
[0044]
[0045] The epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 184-190 g / eq and a viscosity of 12000-15000 cps / 25°C. The specific model is epoxy resin 128E, which is a commercially available product.
[0046] The preparation method of embodiment 1~3 modified epoxy resin is as follows:
[0047] A1. Preparation of intermediate ketimine A: Add triethylenetetramine and methyl isobutyl ketone in the formula amount to the reactor, react at 160-180°C for reflux for 12 hours, keep at 160-180°C, and 80 ± 10) kPa negative pressure under reflux dehydration 24h, made the intermediate ketimine A;
[0048] A2. Preparation of the intermediate ketimine B: add ...
Embodiment 4～6
[0055] Embodiments 4-6, cathodic electrophoretic coating with high throwing power of the present invention and its preparation
[0056] The formulations of cathodic electrophoretic coatings with high throwing power in Examples 4 to 6 of the present invention are shown in Table 2 below.
[0057] The formula of table 2 embodiment 4~6 cathodic electrophoretic coating with high throwing power
[0058]
[0059] The preparation method of embodiment 4~6 cathodic electrophoretic paint with high throwing power is as follows:
[0060] S1. Preparation of modified epoxy resin emulsion: add the modified epoxy resin in the amount of formula into the reactor, and add the aminosulfonic acid and deionized water in the amount of formula in the stirring state at a temperature of 50-60°C, and keep warm After 4 hours, add deionized water for emulsification, lower the temperature to 45°C to 50°C, and extract the solvent for 5 hours under a negative pressure of -(80±10)kPa to prepare a modified ...
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Abstract
The invention belongs to the technical field of environment-friendly water-based coatings, and in particular relates to a modified epoxy resin, a preparation method thereof, and a cathodic electrophoretic coating with high throwing power containing the modified epoxy resin. The raw materials for preparing the modified epoxy resin of the present invention include epoxy resin, bisphenol, polyethylene glycol, N,N-dimethylbenzylamine, 4-methyl-2-pentanone, intermediate ketimine A, Intermediate ketimine B, intermediate C, alcohol ether solvent, propylene glycol methyl ether acetate and polyether amine, use the modified epoxy resin to prepare corresponding emulsion and color paste, and then make the emulsion and color paste according to Proportional mixing to prepare cathodic electrophoretic coatings. Compared with the existing cathodic electrophoretic coating, the cathodic electrophoretic coating of the present invention has significantly improved throwing power, and can well satisfy the surface electrophoretic coating of workpieces with complex surface structures, so that the surface of the coated workpiece, the depth of the recess, the gap and The shielded part obtains a uniform thickness of the coating film layer, thereby effectively improving the overall corrosion resistance of the workpiece, and has a wide range of applications.
Description
technical field [0001] The invention belongs to the technical field of environment-friendly water-based coatings, and in particular relates to a modified epoxy resin, a preparation method thereof, and a cathodic electrophoretic coating with high throwing power containing the modified epoxy resin. Background technique [0002] Cathodic electrophoretic coating has technical advantages such as excellent anti-corrosion performance, high automatic coating efficiency, and water-based environmental protection. It has been widely used in electrical appliances, building materials, automobiles and other industries. Throwing power refers to the ability of the paint to coat the inner surface, recesses and back of the object to be coated during electrophoretic painting, and also refers to the ability to coat a uniform paint film on all surfaces of the complex object to be coated. Threshing power performance is a key performance of electrophoretic coating performance. With excellent throw...
Claims
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