Polyamide composition for quick injection molding and preparation method thereof

Abstract

The invention provides a polyamide composition for quick injection molding and a preparation method thereof. The polyamide composition comprises 95-100 weight parts of polyamide resin and below 0.5 weight part of a nucleating agent, preferably, 0.005-0.5 weight part, and optimally, 0.005-0.03 weight part, wherein the polyamide resin includes polyamide 5X resin. The preparation method for the polyamide composition for quick injection molding comprises the following steps: (1) uniformly mixing the components of the polyamide resin composition, thereby obtaining a mixture; and (2) extruding and granulating the mixture, thereby obtaining the polyamide composition. The crystallizing speed of the polyamide composition prepared according to the invention is obviously increased, so that the purposes of shortening the manufacturing and molding period and increasing the size stability of the quick injection molding product can be achieved.

Description

Technical field [0001] The invention belongs to the field of polymer materials and relates to a polyamide composition for rapid injection molding and a preparation method thereof. Background technique [0002] Polyamide is non-toxic, lightweight, has excellent mechanical strength, good wear resistance and good corrosion resistance. It is widely used in machinery manufacturing, chemical industry, instrumentation, automobiles, home appliances and other industrial fields. It is an important engineering Plastics, even polyamides that have not been modified with reinforcement, flame retardancy, toughening, etc., are widely used in national production and life, such as our common cable ties, nylon screws, terminal blocks and binding posts of electronic components, etc. The product is mainly made of polyamide 66 through the injection molding process. [0003] Compared with polyamide 66, bio-based polyamide 56 has one less carbon atom in its repeating unit and is a polyamide with a...

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Problems solved by technology

[0003] Compared with polyamide 66, the repeating unit of bio-based polyamide 56 has one less carbon atom, which is a kind of polyamide with odd-even structure. The difference in chemical structure makes the crystallization behavior of the two also different, mainly in polyamide The regularity of the molecular structure of 56 is lower than that of polyamide 66, and the curing time during injection molding is long, which leads to long molding cycle, poor dimensional stability of the product, and even poor mold release, which seriously limits the application of polyamide 56. Due to the difference in the chemical structure of polyamide 56 and polyamide 66, the crystal structure and crystallization mechanism of the two polyamides are more or less different.

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