Synthetic process of polyamide resin for electrophoretic paint resin
A technology of polyamide resin and synthesis process, applied in electrophoretic coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of coating heating loss, high solvent content, high unsealing temperature, tissue toxicity, etc., and achieve properties Stable, widely adaptable, low-cost effects
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Embodiment 1
[0020] (1) Preparation of polyamide resin
[0021] In the reaction kettle equipped with thermometer, stirrer, dropping funnel and reflux condenser, select qualified dimer acid with a viscosity of 6000mPa.s, and its composition is shown in Table 1. Add the amount of dimer acid and aliphatic amine in Table 2, raise the temperature to the outlet water temperature of 140°C, keep the outlet water temperature for 2 hours, raise the temperature to the reaction termination temperature of 210°C in 4 hours, keep it warm for 1 hour, and discharge to produce polyamide A, test Infrared spectrum, amine value, viscosity and solid content. Its infrared spectrum is as figure 1 The indicators are shown in Table 3.
[0022] The liquid phase analysis result of table 1 dimer acid
[0023] components
Content / %
12.45
dimer
78.12
9.43
Viscosity mPa.s / 25℃
6000
[0024] Table 2
[0025] raw material
...
Embodiment 2
[0047] A synthesis process of polyamide resin used for electrophoretic coating resin, the process comprises the following steps: mixing dimer acid and diethylenetriamine with a molar ratio of 1:1.5, heating up to 135°C of outlet water temperature, and maintaining the outlet water temperature for reaction After 2 hours, the temperature was programmed to rise to the reaction termination temperature of 200°C in 3 hours. The reaction termination temperature and the rate of the programmed temperature rise were confirmed by infrared spectrum analysis. By judging whether there was a characteristic peak at 1590cm-1, it was judged whether there was a by-product. If by-products are generated, it is judged as unqualified (such as figure 2 shown). The amine value of the reaction product is controlled at 250±15 mgKOH / g to prepare a polyamide resin. The obtained polyamide resin is synthesized into a cationic resin, then sanded to form a color paste, and then added with water to prepare an...
Embodiment 3
[0050] A synthesis process of polyamide resin used for electrophoretic coating resin, the process includes the following steps: mixing dimer acid and triethylenetetramine with a molar ratio of 1:2, heating up to 145°C of outlet water temperature, and maintaining the outlet water temperature for reaction After 1 hour, the temperature was programmed to rise to the reaction termination temperature of 210°C in 6 hours. The reaction termination temperature and the rate of the programmed temperature rise were confirmed by infrared spectrogram analysis. By judging whether there was a characteristic peak at 1590cm-1, it was judged whether there was by-product generation. If by-products are generated, it is judged as unqualified (such as figure 2 shown). The amine value of the reaction product is controlled at 250±15 mgKOH / g to prepare a polyamide resin. The obtained polyamide resin is synthesized into a cationic resin, then sanded to form a color paste, and then added with water to ...
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