PA66 composite material with excellent low-temperature toughness, low water absorption and high rigidity and preparation method thereof

Abstract

The invention discloses a PA66 composite material with excellent low-temperature toughness, low water absorption and high rigidity and a preparation method thereof. According to the preparation method, specific ABS resin, lamellar structure filler and compatilizer are added into the PA66 resin to improve the water absorption, rigidity and low-temperature toughness of the composite material, wherein the lamellar structure filler, especially ultrafine talc powder with ultralow grain size, is used, the water absorption of the PA66 composite material can be remarkably reduced, and the rigidity ofthe material under dry state and wet state can be improved; specific ABS resin and compatilizer styrene / N-phenylmaleimide / maleic anhydride copolymer are added based on the lamellar structure filler, the compatibility between nylon resin and ABS resin and between resin and filler can be improved, so that the water absorption of the PA66 composite material can be further reduced, the low-temperaturetoughness, especially the low-temperature toughness at negative 40 DEG C, of the composite material can be greatly improved. The composite material can be used under special work conditions, such ashigh humidity and low temperature extreme cold weather, and the application field of PA66 is expanded.

Description

technical field [0001] The invention relates to a modified PA66 composite material and a preparation method thereof, in particular to a PA66 composite material with excellent low-temperature toughness, low water absorption and high rigidity and a preparation method thereof, belonging to the technical field of nylon modification. Background technique [0002] Polyamide resin has excellent comprehensive properties such as excellent mechanical properties, excellent barrier properties, high heat resistance, high wear resistance, high chemical corrosion resistance, etc. It is widely used in machinery manufacturing, electric tools, electronic appliances and transportation, etc. field. However, since the PA66 macromolecular chain contains a large number of amide bonds (-NH-CO-), this polar chemical bond is easy to form hydrogen bonds with water molecules, resulting in PA66 having strong water absorption, and the saturated water absorption of its pure resin can be reduced. Even in ...

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Problems solved by technology

[0004] The above-mentioned existing technologies have more effective solutions in reducing the water absorption rate of polyamide materials and improving the dimensional stability of materials, but the specific solutions are only applicable to special application fields, such as adding glass fiber or layered silicate solutions will lead to material The toughness is greatly reduced, especially for products with 90° or 180° bending requirements, this solution is basically not feasible

Only by adding ABS low water absorption resin, alloy materials with low water absorption and high toughness can be obtained, but the addition of ABS will cause the material to become soft and the modulus will drop significantly

Moreover, the current improvement plan mainly focuses on the comparison of the normal temperature characteristics of materials. There is no research on the performance of polyamide materials under low temperature conditions, especially the low temperature toughness. However, because some products will be used in the extremely cold north, there are more stringent requirements for materials. low temperature requirements

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