High-efficiency enhanced flame-retardant functional masterbatch for direct injection molding of nylon 6 and preparation method thereof

Abstract

The invention belongs to the technical field of plastic modification and processing, and especially relates to a high-efficiency enhanced flame-retardant functional masterbatch for direct injection molding of a nylon 6 product and a preparation method thereof. The functional masterbatch is composed of two kinds of masterbatch A and B. The masterbatch A comprises the following components by mass percentage: 50.0-70.0 wt.% of glass fiber, 15.0-35.0 wt.% of high flow nylon 6 resin, 3.0-10.0 wt.% of a maleic anhydride grafted ionomer, 3.0-6.0 wt.% of star nylon 6 resin, and 0.1-0.3 wt.% of an antioxidant. Compared with the traditional plastic functional masterbatch, the functional masterbatch prepared by the invention avoids the problems that during processing of polyoxymethylene in an enhanced halogen-free flame-retardant nylon 6 modification system, mutual modification of the modification efficiency caused by mutual shearing and friction between the glass fiber and a flame retardant canbe solved, and mismatch problem of the processing temperatures of the above two modified systems is solved, and the modification efficiency of the two modified systems is remarkably enhanced. The masterbatch has the characteristics of easy dispersibility and easy processing, and can be directly injected and molded with nylon 6 resin in a simple ratio.

Description

technical field [0001] The invention belongs to the technical field of plastic modification and processing, and in particular relates to a high-efficiency enhanced flame-retardant functional master batch which can be directly applied to injection molding processing of nylon 6 products and a preparation method thereof. Background technique [0002] Using twin-screw extruder to implement melt blending is a traditional method for plastic modification. Using the high-efficiency and excellent mixing performance of co-rotating twin-screw extruders, thermoplastics and various modified additives can be continuously melt-blended and extruded After granulation, the prepared modified special material will be used again for injection or extrusion processing to form various products. This technical route not only effectively improves the physical and mechanical properties of plastic products such as strength, toughness, stiffness, creep resistance, and flexure resistance, but also endows...

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Problems solved by technology

Using the method of processing the two masterbatches separately can obtain the following technical advantages: ① Avoid direct blending of glass fibers and brominated flame retardants to generate internal friction and heat generation, resulting in the decomposition of halogenated flame retardants; ② Avoid inorganic flame retardants The fiber length-to-diameter ratio between the flame synergist (such as antimony trioxide or zinc borate) and the glass fiber is greatly reduced due to mutual shear wear; 6 The problem of mismatching processing temperature of the two modified systems for melt blending; ④Using the melt pultrusion technology to prepare a reinforced masterbatch with a larger fiber aspect ratio than the traditional chopped glass fiber reinforced masterbatch; ⑤Using maleic anhydride Grafted elastic ionomers are used as the carrier components of A and B masterbatches respectively, and their reactive end groups can have the greatest chance of contacting the end groups of nylon 6 resin in an environment without interference from flame-retardant powders, and maximize their The toughening effect can also improve the interfacial adhesion between the organic and inorganic components in the formula, and at the same time improve the melt fluidity of the compound, improve the surface finish and deformation resistance of the product

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