Polyamide composition with good appearance

Abstract

The invention discloses a polyamide composition with good appearance, prepared from, by weight, 49-89% of thermoplastic polyamide resin, 0.01-10% of a maleic anhydride copolymer, 0-50% of a filler, 0-20% of an anti-impact modifier, and 0.01-20% of a polyhydroxy compound, wherein the maleic anhydride copolymer is one of alternating copolymers or block copolymers made by means of mass polymerization. The maleic anhydride copolymer of special structure is added into a polyamide system, so that melt strength and mechanical properties of the polyamide composition are improved; the polyhydroxy compound is introduced, so that the appearance of the polyamide composition is greatly improved, and the mobility worsening due to the introduction of maleic anhydride copolymers is particularly improved;the maleic anhydride copolymer is particularly suitable for processing or forming procedures having high melt strength requirement, especially extrusion molding, blow molding, foaming and the like.

Description

technical field [0001] The invention relates to a modified polyamide composition, in particular to a polyamide composition with good appearance, and belongs to the technical field of polymer composite materials and processing thereof. Background technique [0002] Due to their excellent mechanical properties, chemical resistance, processability, and heat-oxidative aging resistance, polyamide compositions are often used in the electronics and motor vehicle industries that have strict requirements on the working environment. Among them, motor vehicle engines Peripheral applications are especially common. In order to achieve light weight to achieve the purpose of energy saving, emission reduction and cost reduction, more and more automotive metal parts are replaced by nylon. However, as the structure of parts becomes more and more special, nylon is also required to meet more application processing methods , such as blow molding, extrusion, foaming and other application process...

AI Technical Summary

Problems solved by technology

However, ordinary nylon composite materials cannot meet the needs of increasingly diversified processing methods due to lack of suitable molecular weight, molecular structure and suitable additives.

[0003] In the prior art, there is provided a special composite material for blow molding of reinforced nylon intake pipe, which uses ABS, HDPE, PBT, PET or any combination thereof as a modifier to improve the impact resistance of nylon, and at the same time to change The melt viscosity-temperature characteristics of nylon, and use POE, TPE, EPDM or their maleic anhydride grafts to mix in any proportion to improve compatibility, but does not involve any modification method to improve the melt strength of nylon materials

However, for the nylon composite materials used for blow molding intake manifolds with unimproved melt strength, uneven wall thickness, serious sagging, and even melt fracture during processing will occur when the nylon composite material is used.

In addition, although the mechanical properties of the material are improved by adding common maleic anhydride copolymers in nylon materials in the prior art, the maleic anhydride copolymers added also greatly affect the fluidity of the melt. Although there are similar reports on polyamide compositions that meet multiple applications and have greatly improved mechanical properties, there are no reports on how to take care of the appearance of parts and improve the fluidity of materials at the same time.

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