Long-lived flat fiber-modified polyamide composites for laser welding

Abstract

The invention discloses a long-service life flat fiber-modified polyamide composite material for laser welding. A laser-absorbing part comprises a polyamide, a laser-absorbing component phosphate compound or aqueous polymer dispersant-modified boride particles of a rare-earth metal element, a copper halide metal compound, a halogenated metal salt compound and a glass fiber, wherein the grain size of the boride particles is not greater than 900nm; and a laser-transmitting part comprises a polyamide, a surface modified laser scattering diluent with the main material of white mineral filler containing titanium dioxide, a copper halide metal compound, a halogenated metal salt compound and a glass fiber, wherein the grain size of the laser scattering diluent is 30 to 400nm, the glass fiber consists of 20 to 100 percent of flat glass fiber and 0 to 80 percent of ordinary glass fiber, the major to minor axis diameter ratio of the flat glass fiber is greater than or equal to 2, and the minor axis diameter length of the glass fiber is greater than or equal to 3 microns. The composite material has relatively long service life and provides an alternative for application of a light-color or colorless system.

Description

technical field [0001] The invention relates to a composite material for laser welding, in particular to a long-life flat fiber modified polyamide composite material for laser welding, which belongs to the technical field of modified polymer composite materials. Background technique [0002] The concept of laser welding began in the 1970s, which usually uses a diode laser with a wavelength between 700-1200nm or a synthetic crystal of neodymium-doped yttrium aluminum garnet (Nd:YAG) laser to generate a large amount of heat at the welding site, that is, through the transmission The laser part reaches the laser-absorbing part to generate heat, so that the contact area of ​​the component is melted to form a welding part. [0003] Compared with the traditional plastic welding process, laser welding can be applied to various flexible structures. Its welding strength is high, and its rapid heating and cooling rate can reduce the thermal influence on the material, and no external fo...

AI Technical Summary

Problems solved by technology

Usually, the performance of the welded polymer will attenuate compared with the performance of the resin itself, especially after adding fillers with a certain length-to-diameter ratio (such as glass fiber, wollastonite, etc.), the welding strength of the welding material is lower than that of the untreated polymer. The performance of the welding material itself has obvious attenuation, mainly in the stress concentration of welding strength, defects and performance attenuation fluctuations, which greatly reduce the service life of the final welding product

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