Caprolactam in-situ modified boehmite synergistic flame-retardant reinforced high-temperature nylon material and preparation method thereof

Abstract

The invention discloses a caprolactam in-situ modified boehmite synergistic flame-retardant reinforced high-temperature nylon material and a preparation method thereof. The material is prepared from the following components by mass: 32.4-60.3 parts of high-temperature nylon, 10-50 parts of reinforced fibers, 12-20 parts of a brominated flame retardant, 3-6 parts of boehmite, 1-3 parts of caprolactam, 0.5-1 part of an antioxidant and 0.2-0.6 part of a lubricant. The prepared caprolactam in-situ modified boehmite synergistic flame-retardant reinforced high-temperature nylon material is high in strength (tensile strength, bending strength, impact strength and dielectric strength) and good in flame-retardant effect, and the flame-retardant effect reaches the V-0 level. And the comparative tracking index and the thermal deformation temperature are relatively high. Meanwhile, the product particles are compact in appearance, free of foaming, and light yellow or yellow in color. The market demands are met.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a caprolactam in-situ modified boehmite synergistic flame-retardant reinforced high-temperature nylon material and a preparation method thereof. Background technique [0002] Semi-aromatic nylon has the characteristics of high mechanical strength, high temperature resistance, chemical resistance, good thermal stability, and excellent electrical properties, and is widely used in the electrical and electronic fields. Due to the miniaturization and high-performance requirements of electronics, electrical appliances, and information-related equipment, the volume of various electrical components is getting smaller and smaller, and more stringent requirements are put forward for the electrical, flame-retardant, and insulating properties of plastic components. At present, it is the most economical and convenient method to add flame-retardant additives to the plastic matrix to ...

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Problems solved by technology

Halogenated flame retardants are generally brominated flame retardants such as brominated polystyrene, brominated triazine, etc., whose melting point matches the plastic matrix, and blends with the plastic melt during processing. The material has good popularity and does not affect Mechanical properties, the main mechanism is gas phase flame retardancy, the bond energy of C-Br is relatively low, it can be decomposed to produce HBr gas to block oxygen and capture free radicals, but the low density of HBr cannot completely block oxygen and the burning surface of the plastic substrate cannot form a dense barrier layer , the efficiency is low when used alone, and it needs to be used in conjunction with metal oxides

Industrial use is generally metal oxides such as antimony trioxide and zinc borate. Adding antimony trioxide will reduce the electrical breakdown strength and relative tracking index of the material, and it is easy to corrode the mold and change color at high temperature. Zinc borate It generally contains crystal water, and the dehydration temperature is about 300°C, which is lower than the processing of high-temperature nylon, which will easily cause the material to foam, while anhydrous zinc borate is very easy to absorb water, which is not conducive to storage; the melting point of halogen-free flame retardants is very high, generally large At the melting point of the plastic matrix, it exists in the form of small solid particles and has poor compatibility with the plastic matrix

To meet the flame retardant requirements, a large amount of addition is required, which will cause the deterioration of the physical properties of the material and easy precipitation, and it is not resistant to water boiling, so it is not suitable for plastic shells and transmission parts that have mechanical strength requirements and harsh working environments; when boehmite is used as a cooperating When used as an effective flame retardant, the boehmite surface has a large number of hydroxyl groups, the surface polarity is large, and the compatibility with the plastic matrix is ​​poor, which will easily lead to uneven dispersion of the boehmite powder, which will reduce the flame retardant effect and impact strength of the material.

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