Low-mold-scale halogen-free flame-retardant thermoplastic polyamide composition as well as preparation method and application thereof

Abstract

The invention provides a low-mold-scale halogen-free flame-retardant thermoplastic polyamide composition as well as a preparation method and application thereof. The low-mold-scale halogen-free flame-retardant thermoplastic polyamide composition comprises the following components in parts by weight: 20-82 parts of thermoplastic polyamide resin; 13-25 parts of a flame retardant; 1-5 parts of a flame retardant synergist; 5-50 parts of a reinforcing material; and 0.5 to 5 parts of an adsorbent. The flame retardant comprises a hypophosphite flame retardant; and the adsorbent is an ethylene copolymer. According to the low-mold-scale halogen-free flame-retardant thermoplastic polyamide composition disclosed by the invention, the ethylene copolymer is added as an adsorbent, and the addition amount of the ethylene copolymer is controlled, so that the prepared low-mold-scale halogen-free flame-retardant thermoplastic polyamide composition not only has excellent flame-retardant performance and electrical performance, but also can effectively reduce the release amount of small molecules in an injection molding process, and greatly reduce the mold scale amount generated in the injection molding process.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a low mold fouling, halogen-free flame-retardant thermoplastic polyamide composition and a preparation method and application thereof. Background technique [0002] Polyamide is collectively referred to as nylon, which is named after the repeated amide group -[NHCO]- in the main chain of the molecule. Due to the polar amide group in the molecular structure, a strong hydrogen bond is formed between the molecular chains. It has high crystallinity and superior mechanical properties. Polyamide is a type of basic resin with the largest output, the most varieties, the widest range of uses, and excellent comprehensive performance among the five general-purpose engineering plastics. [0003] As a general-purpose halogen-free flame retardant, diethylphosphinate not only has good flame retardant performance, but also has a small amount of addition, and has little influence on the physical...

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Problems solved by technology

For example, the European patent EP2417191A1, by adding calcium oxide to the system, neutralizes some acidic substances in the system, reduces the acidity of the system, and reduces the decomposition of the matrix resin, thereby effectively reducing the corrosion of the mold during the high-temperature injection molding process; although this method It is helpful to reduce mold scale, but calcium oxide is easy to absorb moisture, resulting in high water absorption rate of the system, which is difficult to control during processing

[0006] The above-mentioned patents can improve the mold fouling of diethylphosphinic acid flame-retardant polyamide to a certain extent, but it is difficult to avoid the control of moisture in the process of use, resulting in the contact of diethylphosphinic acid salt with water, and the existence of The instability of quality can easily lead to the enhancement of the acidity of the material and the deterioration of mold deposits

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