Preparation method of polyamide-imide copolymer
A technology of polyamide-imide copolymer and trimellitic anhydride acid chloride, which is applied in the field of preparation of polyamide-imide, can solve the problems of product performance damage, plasticizer migration, etc., achieve short reaction time, high temperature retention rate, and easy Processing effect
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[0028] Example 1
[0029] Add 660g of N-methylpyrrolidone to a 3-liter reactor equipped with a stirrer, temperature regulator, dropping funnel and cooler, followed by 100g (0.5mol) 4,4'-diaminodiphenyl ether, 100g (0.5 mol) 3,4'-diaminodiphenyl ether and 10.8g m-phenylenediamine were stirred and dissolved at 10°C, followed by adding 211g (1.1mol) trimellitic anhydride acid chloride (TMAc), where TMAc was divided into 10 batches, each time Add 21.1g at an interval of 10 minutes, and react for 3 hours after the addition of the materials. Then add 2.3g of hydroxyphthalic anhydride, stir for 1.5 hours, the reaction is over, add 1600ml of deionized water, stir to precipitate the polymer, filter, Wash with water, filter, dry and imidize at 250°C for 2 hours, in N-methylpyrrolidone at 30°C, with a concentration of 0.5g / dl, and determine the intrinsic viscosity to be 0.65dl / g, Tg: 275°C.
[0030] According to injection molding conditions, dry at 150°C for 5 hours with a moisture content o...
Example Embodiment
[0035] Example 2
[0036] In addition to adding 120g (0.6mol) 4,4'-diaminodiphenyl ether, 80g (0.4mol) 3,4'-diaminodiphenyl ether, the polymerization temperature is 5℃, and the blocking agent hexahydrophthalic anhydride 0.9g is added, The end-capping reaction was performed for 1 hour, and the dry imidization was carried out at 230° C. for 2 hours, and the other formulations and operation steps were the same as in Example 1. Results: The intrinsic viscosity was 1.0 dl / g, the Tg was 285°C, and the performance indicators of the injection sample were the same as in Example 1.
Example Embodiment
[0037] Example 3
[0038] Except that the polymerization temperature is 25°C, 1 g of 1-methylhexahydrophthalic anhydride is added, the end-capping reaction is 2 hours, and the imidization reaction is 2 hours at 220°C, the other formulations and operation steps are the same as in Example 1. Results: The intrinsic viscosity was 0.72dl / g, Tg: 260°C. The performance indicators of the injection sample were the same as in Example 1.
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