Viscosity-reduction toughness-increasing and in-situ synthesizing method of low VOC (Volatile Organic Compound) cathode electrophoretic paint resin
A cathodic electrophoretic coating and in-situ synthesis technology, which is applied in electrophoretic coatings, polyester coatings, epoxy resin coatings, etc., and can solve problems such as VOC emissions
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Embodiment 1
[0022] Add 270g of epoxy resin (epoxy equivalent 188), 80g of bisphenol A, 0.2g of dimethylbenzylamine, 60g of ε-caprolactone, and 0.1g of stannous octoate into a 1000ml three-necked flask, and heat up to 160°C. To epoxy equivalent 1250, cool to 100°C, add 26.3g methylethanolamine, keep warm at 110°C for 2h, use gas chromatography to detect ε-caprolactone content at 0.5%, do not contain xylene, cool down, and obtain the target product A1.
[0023] Control Experiment 1:
[0024] Neopentyl glycol 10g, ε-caprolactone 120g, stannous octoate 0.2g, be warming up to 160 DEG C, be incubated to detect ε-caprolactone content with gas chromatography at 0.5%, cool down, obtain target product a1;
[0025] Add 270g of epoxy resin (epoxy equivalent 188), 80g of bisphenol A, 0.2g of dimethylbenzylamine, and 30g of xylene in a 1000ml three-necked flask in sequence, raise the temperature to 160°C, and keep reflux until the epoxy equivalent is 1130 ( The terminal epoxy molecular weight is simi...
Embodiment 2
[0027] Add 135g of epoxy resin (epoxy equivalent 188), 35g of bisphenol A, 0.2g of dimethylbenzylamine, 40g of ε-caprolactone, and 0.1g of stannous octoate into a 1000ml three-necked flask, and heat up to 180°C. To epoxy equivalent 1200, cool to 100°C, add 14.3g methylethanolamine, keep warm at 100°C for 2h, use gas chromatography to detect ε-caprolactone content at 0.2%, do not contain xylene, cool down, and obtain the target product A2.
[0028] Control experiment 2:
[0029] Neopentyl glycol 10g, ε-caprolactone 100g, stannous octoate 0.1g, heat up to 140°C, keep warm until the content of ε-caprolactone detected by gas chromatography is 0.5%, cool down, and obtain the target product b1;
[0030] Add 135g of epoxy resin (epoxy equivalent 188), 35g of bisphenol A, 0.2g of dimethylbenzylamine, and 20g of xylene in a 1000ml three-necked flask in sequence, raise the temperature to 180°C, and keep reflux until the epoxy equivalent is 1090 ( End point epoxy molecular weight is si...
Embodiment 3
[0034] Prepare cathodic electrophoretic paint model verification formula according to the following components and their mass ratios:
[0035]
[0036] * It is prepared by the reaction of ethanol, ethylene glycol butyl ether, caprolactam and diphenylmethane diisocyanate (MDI);
[0037] Mix the above groups uniformly according to the proportion, add lactic acid aqueous solution for co-emulsification (neutralization degree 50%), and obtain cathodic electrophoretic paint emulsion. Stir and ripen for 24 hours. The content of xylene in the tank liquid was tested by gas chromatography when it was just prepared and after 24 hours of aging. The emulsion and the color paste are prepared into a bath solution according to the ratio of 4:1, matured, electrophoresed at 200V for 2 minutes, baked at 160°C for 20 minutes, and the properties of the coating film are as follows:
[0038]
[0039] * The measured data are relative to the quality of the bath solution.
[0040] a) Measure...
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