Semi-aromatic transparent polyamide material and preparation method thereof

Abstract

The invention discloses a semi-aromatic transparent polyamide material and a preparation method thereof, belonging to the field of high-molecular materials. The material consists of a random copolymer of semi-aromatic amide salt and aliphatic amide salt and necessary auxiliaries; the intrinsic viscosity is 1.0-2.2dl / g, and the degree of crystallinity is less than 15%; the semi-aromatic amide salt is selected from amide salt 9T, amide salt 9I, amide salt 10T and amide salt 10I; and the aliphatic amide salt is selected from amide salt 610 and amide salt 1010. The preparation method comprises the following steps: adding the semi-aromatic amide salt, aliphatic amide salt and auxiliaries into a polymerization kettle; adding water which is 0.3-1.0 times the total mass of the semi-aromatic amide salt and aliphatic amide salt; in a protective gas atmosphere, stirring and heating to 160-210 DEG C within 1-2 hours, and performing constant-temperature pre-polymerization for 1-3 hours; heating to 240-300 DEG C, increasing pressure to 1-3MPa, and maintaining the pressure for reaction for 1-3 hours; slowly degassing to normal pressure within 1-4 hours; continuously stirring at constant temperature for 1-4 hours; and discharging after the reaction.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a semi-aromatic transparent polyamide material, and also relates to a preparation method of the polyamide material. Background technique [0002] In addition to excellent transparency, transparent polyamide also has many excellent properties, such as: good thermal stability, high mechanical strength, good electrical insulation, wear resistance, chemical corrosion resistance, small linear expansion coefficient, low molding shrinkage, size Good stability, easy processing and molding, non-toxic, odorless, superior protective performance and surface performance, etc., so it is widely used in precision optical instruments, measuring instruments, pharmaceutical and chemical packaging materials, eyeglass frames, high-end sports equipment and auto parts. There are a wide range of applications. [0003] At present, there are many researches on transparent polyamide, su...

AI Technical Summary

Problems solved by technology

[0008] The principle of transparency of polyamide described in the above patents is that the existence of complex side groups or benzene rings in the macromolecular chain destroys the regularity of the macromolecular chain, resulting in non-crystallization or microcrystals of polyamide, so that it is transparent

However, the raw materials are all diacids or diamines with multiple side chains or ring structures. The production process of raw materials is complicated and the price is high, resulting in high cost of transparent polyamide.

Although the patent CN101372531A introduces a method for preparing transparent polyamide using cheap domestic raw materials, its thermal properties and elongation at break cannot meet the needs of some occasions

In addition, the above-mentioned transparent polyamides generally have good rigidity, but the toughness is difficult to meet the needs of some industries

In fact, the existing polyamides with good toughness are usually poor in rigidity, while most of the polyamides with excellent mechanical properties are more expensive or have unsatisfactory transparency.

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