Polyamides have the following synthetic routes:
(1) polycondensation of dibasic acid and diamine: if adipic acid and hexamethylene diamine are used in ethanol, the 66 salt is firstly formed in an equimolar ratio, and polycondensed at 280 ° C under pressure to obtain Pa66; The diamine is neutralized with sebacic acid to form a salt, and batch or continuous polycondensation under pressure can obtain Pa610; Pa612 can be obtained by using hexamethylenediamine and dodecanedioic acid. The same method can be used to make Pa46, Pa1010 and the like.
(2) Polyamide 6, polyamide 12 and the like can be obtained by ring-opening polymerization of phenol or cyclohexane.
(3) Polyphenol can be obtained by polycondensation of w-aminodecanoic acid. And w-aminodecanoic acid can be obtained by adding undecylenic acid to hydrogen bromide and then reacting with ammonia.
(4) A polyamide copolymer such as Pa6/66 can be obtained by copolymerization using a polyamide as a raw material.
(5) A new polyamide resin can be obtained by blending with various polyamide resins.
The above is the basic process route for polyamide synthesis. In fact, there are many methods for synthesis, and the industry mainly considers economics.
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