Efficient enhanced flame-retardant multifunctional master batch for direct injection molding of PBT

Abstract

The invention belongs to the technical fields of plastic modification and processing and particularly relates to an efficient enhanced flame-retardant multifunctional master batch which can be directly applied to the direct injection molding of PBT products and a preparation method of the master batch. The multifunctional master batch is formed by the combination of a master batch A and a master batch B, wherein the master batch A contains the following components in percentage by weight: 50.0wt%-70.0wt% of glass fibers, 15.0wt%-30.0wt% of high-flow PBT resin, 5.0wt%-10.0wt% of diglycidyl ether acrylate grafted elastic ionomer and 0.1wt%-0.3wt% of an antioxidant. Compared with a traditional plastic functional master batch, the prepared functional master batch has the advantages that the mutual loss of the modification effects caused due to the mutual shear loss between the glass fibers and the flame retardant in the processing process of an enhanced bromine-series PBT resin modification system is avoided, the problem that the processing temperatures of two modification systems are not matched is solved, and the modification effects of the two systems are remarkably improved; and the multifunctional master batch has the characteristics of easiness in dispersion and processing and can be subjected to injection molding after being simply mixed with PBT resin in proportion, and anexcellent modification effect is achieved.

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 masterbatch which can be directly applied to injection molding of PBT 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 plastic product...

AI Technical Summary

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-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; The problem of the mismatching processing temperature of the modified system for melt blending; ④Using melt pultrusion technology to prepare a reinforced masterbatch with a larger fiber aspect ratio than the traditional chopped glass fiber reinforced masterbatch; ⑤Acrylic acid diglycidyl ether Grafted elastic ionomer is used as the carrier component of A masterbatch, and its reactive end group can have the greatest chance of contact with the end group of PBT resin in the environment without interference from flame retardant powder, so as to maximize its toughening effect

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