Polyamide resin and preparation method thereof and polyamide material prepared from same

Abstract

The invention discloses polyamide resin and a preparation method thereof and a polyamide material prepared from the same. The polyamide resin is prepared from fluorine-containing aromatic dicarboxylic acid or a mixture of the fluorine-containing aromatic dicarboxylic acid and conventional aromatic diacid and one or more of diamine containing an alicyclic structure. The polyamide resin and other auxiliaries are mixed through a double-screw extruder technology to prepare the polyamide material. The prepared resin and material have good transparency, and the visible light transmittances of resin and material sheets of 1 mm both exceed 90%; meanwhile, the resin and material have excellent heat resistance, thermal-oxidation stability and low water absorption property, the glass-transition temperature of the resin and the glass-transition temperature of the material are both larger than 200 DEG C, good optical property and chemical property still can be kept after long-time usage at 150 DEG C, and the polyamide material can serve as a transparent material suitable for being used under higher temperature occasions.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyamide resin, a preparation method thereof, and a polyamide material prepared therefrom. Background technique [0002] Transparent polyamide resin is a kind of amorphous or microcrystalline thermoplastic polyamide, the light transmittance can reach 90%, its transparency is better than polycarbonate (PC), close to polymethyl methacrylate (PMMA). In addition, it also has good thermal stability, impact toughness, electrical insulation, dimensional stability and aging resistance, low product shrinkage and low linear expansion coefficient. Transparent nylon has better oil resistance, corrosion resistance, wear resistance, scratch resistance and other properties than other transparent plastics, and can be used in automobiles, electronics, machinery, optics, sports and other fields. [0003] In the prior art of transparent polyamide resins, the amorphous or microcrystalline struct...

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Problems solved by technology

[0007] Comparing the patents and technologies of the above existing transparent polyamide resins, we believe that the prior art has the following problems: (1) In order to obtain high transparency of polyamides, various aliphatic / aromatic monomer copolymerization methods are used to Realize the amorphous aggregation state of the material, especially the use of flexible linear aliphatic diamine monomers, which sacrifices the heat resistance of polyamide itself to a large extent. The glass transition temperature is lower than 200°C, and the long-term use temperature Generally not higher than 100-120°C; (2) The molecular structure of the polymer with a full hydrocarbon structure will inevitably have insufficient thermal oxidation stability such as aging and degradation under the condition of long-term high-temperature use; (3) The water absorption rate of polyamide It is higher than other polymers due to its intrinsic chemical structure, which makes polyamide materials have insufficient dimensional stability when used under hot and humid conditions

[0008] Therefore, the above problems of the existing transparent polyamide plastics lead to its limited application fields, and it is difficult to use it in complex environments such as high temperature and high humidity.

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