PA66 composition with good surface performance, and preparation method thereof

Abstract

The invention discloses a PA66 composition with good surface performance. The PA66 composition comprises, by weight, 30-80% of a PA66 resin, 1-40% of a fire retardant, 0-50% of glass fibers, 0.1-10.0% of diatomaceous earth, 0.1-10.0% of a hydrolysis-resistant agent and 1-5.0% of a processing aid. By adding diatomaceous earth and the hydrolysis-resistant agent into the PA66 resin to prepare the PA66 composition, small molecular substances in the PA66 composition are combined by the diatomaceous earth while the hydrolysis-resistant property of the PA66 resin is increased, so that the PA66 composition greatly reduces precipitate content and precipitate size at a hot and humid environment and has excellent surface performance.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a PA66 composition with good surface properties and a preparation method thereof. Background technique [0002] Polyamide 66 is polyhexamethylene adipamide, industrially referred to as PA66 resin, which is widely used in automobiles, machinery and electronic devices due to its high strength, high heat resistance, high fatigue resistance, chemical resistance and outstanding oil resistance. field. However, it is still unable to fully meet people's needs, and it has become a routine method to further improve the flame retardancy of PA66 resin through compound modification. [0003] It is a well-known fact that in the prior art, the PA66 composition added with OP and MPP flame retardants is prone to severe precipitation under high temperature and high humidity environment, resulting in unacceptable surface defects in the parts during use, which seriously Affect the apparent quality...

AI Technical Summary

Problems solved by technology

However, it still cannot fully meet people's needs. It has become a routine method to further improve the flame retardancy of PA66 resin through compound modification.

[0003] It is a well-known fact that in the prior art, the PA66 composition added with OP and MPP flame retardants is prone to severe precipitation under high temperature and high humidity environment, resulting in unacceptable surface defects in the parts during use, which seriously Affect the apparent quality of the part

Unless the PA66 resin in the PA66 composition is replaced with high-temperature nylon, the surface properties of the polyamide composition can be improved, but due to the high cost and harsh processing of high-temperature nylon, it is difficult to be widely promoted in the market

[0004] At present, diatomaceous earth is mainly used as an inorganic filler to improve the mechanical properties of PA66 compositions such as tensile strength, flexural strength, flexural modulus, and heat resistance properties such as thermal deformation strength; anti-hydrolysis agents are widely used to improve PA66 compositions. The mechanical properties of the water boiling resistance of the composition can generally maintain the mechanical properties of the water boiling resistance at a certain level; so far, the combination of diatomaceous earth and anti-hydrolysis agents applied to PA66 resins can reduce precipitation in high-temperature and high-humidity environments. The content of the substance and the size of the precipitate are reduced, so that the report of the PA66 composition with good surface properties has not been found

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