Black-coloured polyamide composition with high laser transmittance for laser welding application

Abstract

Polyamide composition, comprising (i) at least one aliphatic polyamide or semi-aromatic polyamide or mixture thereof; (ii) glass fibres; (iii) at least one non-fibrous reinforcing material in an amount of up to 8 wt.-%; (iv) at least one black dye of the monoazo complex type; (v) optionally one or more further additives.

Description

technical field

[0001] The present invention relates to a polyamide composition for producing molded parts which exhibit high laser transmission while maintaining satisfactory mechanical properties when producing articles using laser welding techniques. The article can be used in specific automotive applications such as filter housings, resonators, exhaust control valves, door lock components and display components. Background technique

[0002] Lasers are still relatively new as a tool for joining plastics, but this industrial application is likely to become as mature as laser marking and laser cutting. To date, materials welded using lasers have mainly been plastic films, and the process has only recently been extended to the joining of three-dimensional assemblies for series-produced parts.

[0003] The laser welding process technology for thermoplastics offers a number of advantages over conventional welding methods such as heated tool welding, vibration welding or ultr...

Examples

Embodiment Construction

[0098] Preparation of polyamide composition:

[0099] Several polyamide compositions were prepared as examples and comparative examples.

[0100] The following components were used as starting materials:

[0101] Component (i): PA6.6 homopolymer

[0102] Component (ii): Glass fiber chopped strands with an average length of 4.5 mm and an average diameter of 10 μm (T435R purchased from Taishan)

[0103] Component (iii): Solid glass beads with an average diameter of 20 μm (Microperl 050-20-215 from Sovitec)

[0104] Component (iv): Monoazo complex dye solvent black 27

[0105] Component (v): Heat Stabilizer and Release Masterbatch (MM9549C from Solvay)

[0106] The composition for molding according to the invention is prepared by mixing in a twin-screw type extruder ZSK 18W at a rate of 12 kg / h and an equal screw rotation speed of 300 rev / min at a temperature ranging from 265°C to 340°C, Depending on the formulation of the various components and the amounts disclosed ...

technical field

[0001] The present invention relates to a polyamide composition for producing molded parts which exhibit high laser transmission while maintaining satisfactory mechanical properties when producing articles using laser welding techniques. The article can be used in specific automotive applications such as filter housings, resonators, exhaust control valves, door lock components and display components. Background technique

[0002] Lasers are still relatively new as a tool for joining plastics, but this industrial application is likely to become as mature as laser marking and laser cutting. To date, materials welded using lasers have mainly been plastic films, and the process has only recently been extended to the joining of three-dimensional assemblies for series-produced parts.

[0003] The laser welding process technology for thermoplastics offers a number of advantages over conventional welding methods such as heated tool welding, vibration welding or ultr...

Examples

Embodiment Construction

[0098] Preparation of polyamide composition:

[0099] Several polyamide compositions were prepared as examples and comparative examples.

[0100] The following components were used as starting materials:

[0101] Component (i): PA6.6 homopolymer

[0102] Component (ii): Glass fiber chopped strands with an average length of 4.5 mm and an average diameter of 10 μm (T435R purchased from Taishan)

[0103] Component (iii): Solid glass beads with an average diameter of 20 μm (Microperl 050-20-215 from Sovitec)

[0104] Component (iv): Monoazo complex dye solvent black 27

[0105] Component (v): Heat Stabilizer and Release Masterbatch (MM9549C from Solvay)

[0106] The composition for molding according to the invention is prepared by mixing in a twin-screw type extruder ZSK 18W at a rate of 12 kg / h and an equal screw rotation speed of 300 rev / min at a temperature ranging from 265°C to 340°C, Depending on the formulation of the various components and the amounts disclosed ...

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