Polyamide composition with ultralow viscosity and preparation method thereof

Abstract

The invention discloses a polyamide composition with ultralow viscosity and a preparation method thereof. The polyamide composition is prepared from following components in percentage by weight: 48 to 55% of 1,6-adipic acid, 40 to 45% of 1,6-hexamethylenediamine, 0.5 to 10% of muconic acid, 0.3 to 10% of maleic anhydride, low molecular weight oligomer accounting for 0.01 to 0.1% of the total weight of the components mentioned above, zinc chloride accounting for 0.01 to 0.05% of the total weight of the components mentioned above, and thermoplastic polyester accounting for 1 to 5% of the total weight of the components mentioned above. During the condensation polymerization process between adipic acid and hexamethylenediamine, muconic acid is introduced into the reaction system, participates in the copolymerization reactions, and generates a synergistic effect with maleic anhydride; in the presence of oligomer with a specific low molecular weight and zinc oxide, the viscosity of polyamide is obviously reduced; the melt index of the polyamide composition is effectively increased, the flowing performance is obviously enhanced, and good mechanical properties are maintained.

Description

technical field [0001] The invention relates to a polyamide composition and a preparation method thereof. Background technique [0002] At present, polyamide is used to produce a variety of structural components in different fields due to its excellent mechanical strength, heat resistance, flame retardancy and other properties. For the fields of automobiles and construction, the requirements for high strength and good rigidity of materials high. Among them, further improving the mechanical properties of polyamides such as strength and rigidity can be achieved by adding glass fibers subsequently. Therefore, polyamide substrates suitable for further processing and modification have gradually attracted the attention of those skilled in the art. However, with the increase in the amount of glass fiber, although the rigidity and dimensional stability of polyamide materials are improved, and the water absorption rate of polyamide can be reduced, a series of new problems are also i...

AI Technical Summary

Problems solved by technology

However, with the increase in the amount of glass fiber, although the rigidity and dimensional stability of polyamide materials are improved, and the water absorption rate of polyamide can be reduced, a series of new problems are also introduced, such as the increase of material melt viscosity, It is difficult to process and shape, and the products are prone to glass fiber exposure, rough surface and other adverse phenomena

[0003] Under normal circumstances, introducing a branched structure into the polyamide structure can improve its fluidity. For example, patent CN200680017293.8 reports that a partially branched polyamide oligomer containing terminal amino groups is introduced into a high molecular weight polyamide to improve its viscosity and increase Fluidity; patent CN200880109110.4 also uses the trifunctional compound dihexamethylene triamine to improve the fluidity of polyamide, but the branched structure will lead to a decline in crystallization performance and strength

Patent CN201811467315 improves the melt index of the material by adding dicumyl peroxide and triallyl isocyanurate to polyamide 66, thereby improving its fluidity, but a large amount of vulcanizing agent (dicumyl peroxide) The addition of polyamide will greatly change the mechanical properties of polyamide, crack the physical properties of the material, and reduce the strength

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