Semi-aromatic polyamide composition as well as preparation method and application thereof

Abstract

The invention discloses a semi-aromatic polyamide resin composition as well as a preparation method and application thereof. The composition comprises the following components in parts by weight: 20 to 70 parts of semi-aromatic polyamide resin, 1 to 15 parts of aliphatic polyamide resin, 0.1 to 3 parts of a polyamide nucleating agent, 0.1 to 5 parts of a heat-resistant auxiliary agent, 0 to 60 parts of glass fibers, and 0-3 parts of a toner, wherein the aliphatic polyamide is semi-crystalline polyamide of which the melting enthalpy value is not less than 15 J / g. The composition has more excellent laser transmission performance and more excellent laser welding performance; meanwhile, a molded part of the composition can obtain excellent laser transmission uniformity, and the problem of unstable welding in existing laser welding product production can be solved; moreover, by adopting the composition, the problem of poor product appearance caused by surface layer laser burn of the laser-transmitting layer in the welding process can also be remarkably improved at the same time.

Description

technical field [0001] The present invention relates to the technical field of polymer materials, more specifically, to a semi-aromatic polyamide composition and its preparation method and application. Background technique [0002] Polyamide is currently one of the most widely used engineering plastics, widely used in electronic appliances, automobiles, home appliances, sporting goods and other fields. With the increasing structural complexity of automotive parts and some electronic and electrical parts, it is difficult or even impossible to use direct injection molding to make them, so the parts need to be laser welded. Compared with traditional plastic welding processes, such as hot plate welding, hot gas welding, induction welding, spin welding, ultrasonic welding, vibration friction welding, laser welding technology has many advantages: fast welding speed, good welding quality, clean, no vibration. Therefore, this welding process is widely used in plastic precision par...

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Problems solved by technology

[0006] The present invention provides a semi-aromatic polyamide composition to overcome the welding instability caused by poor laser transmission uniformity and the appearance defects caused by surface laser burns during laser welding.

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