Low-deformation easy-to-form reinforced nitrogen flame-retardant PA6/PA66 and preparation method thereof

Abstract

The invention discloses a low-deformation easy-to-form reinforced nitrogen flame-retardant PA6 / PA66 (polyamide 6 / polyamide 66) and a preparation method thereof. The low-deformation easy-to-form reinforced nitrogen flame-retardant PA6 / PA66 is prepared from the following raw materials in parts by weight: 45 to 63 parts of PA6 resin, 10 to 15 parts of PA66 resin, 10 to 20 parts of a nitrogen flame retardant MCA, 15 to 30 parts of calcium sulfate whiskers, 0.5 to 1 part of a high-temperature antioxidant, 0.5 to 1 part of a lubricant, 0 to 0.5 part of a nucleating agent, 0.5 to 1 part of a flowable agent and 0.5 to 1 part of a coupling agent. According to the PA6 material, the calcium sulfate whiskers are adopted to replace glass fibers, so that the warping degree of an injection molded product is reduced, the dimensional stability is improved, and the assembly gap is reduced.

Description

technical field [0001] The invention relates to a low-deformation easy-to-form reinforced nitrogen-based flame-retardant PA6 / PA66 and a preparation method thereof, belonging to the technical field of plastics. Background technique [0002] With the improvement of people's quality of life and the increase of market competition among various enterprises, manufacturers of low-voltage electrical appliances have put forward requirements for miniaturization, thinning and high efficiency of low-voltage electrical enclosures, and the injection molding performance and assembly performance of modified plastics put forward higher requirements. [0003] Glass fiber is widely used as a reinforcing agent for modified plastics of low-voltage electrical shells, but it is difficult to distribute glass fiber evenly in complex molds, and it is easy to appear poor glue areas, resulting in poor surface finish and unstable performance of the material, and the structure of glass fiber itself is al...

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Problems solved by technology

[0003] Glass fiber is widely used as a reinforcing agent for modified plastics of low-voltage electrical shells, but it is difficult to distribute glass fiber evenly in complex molds, and it is easy to appear poor glue areas, resulting in poor surface finish and unstable performance of the material, and the structure of glass fiber itself is also difficult. Significantly reduces the fluidity of the material, making it difficult to achieve high yield in one cavity, affecting production efficiency

In addition, the mold is severely worn during processing, especially for thin-walled parts, and the lack of glue is obvious, which affects the appearance and performance of injection molded products, especially after molding. The deformation is too large, and there is a large gap tolerance after assembly.

[0004] The production efficiency of the existing glass fiber reinforced nitrogen-based flame-retardant PA6 material is low, and there are large gaps in the assembly process, which cannot meet the needs of the increasingly mature market

[0005] In order to solve the assembly tolerance problem of the existing glass fiber-reinforced nitrogen-based flame-retardant PA6 materials, some technologies will use the glass fiber to be ground, that is, to reduce the length of the glass fiber in the composite material, and the glass fiber with a small aspect ratio is used for reinforcement. The nitrogen-based flame-retardant PA6 composite material will indeed reduce the warpage of the composite material, but it is difficult to process the ground glass fiber, and the price is about twice as expensive as that of the ordinary glass fiber, resulting in an increase in material cost; Material processing machinery twin-screw extruder screw combination, that is, to enhance the clipping of the screw to achieve the purpose of cutting the general glass fiber added to the composite material, so as to finally reduce the warpage of the composite material, but high shear, wear on the screw Seriously, the depreciation of equipment is fast, and the cost of materials will eventually be increased; and by replacing glass fibers with traditional mineral fillers such as talc powder, calcium carbonate, mica powder, etc., the warpage of the composite material can be reduced, but the overall composite material There is also a large loss in mechanical properties, which cannot meet the needs of product performance.

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