A high-efficiency enhanced halogen-free flame-retardant functional masterbatch for PBT direct injection molding and its preparation method

Abstract

The invention belongs to the technical field of plastic modification and processing, and particularly relates to efficient reinforced halogen-free flame retardant functional master batch capable of being directly applied to injection molding processing of PBT products and a preparation method of the efficient reinforced halogen-free flame retardant functional master batch. The multifunctional master batch is formed by a master batch body A and a master batch body B which are combined, and the master batch body A is prepared from the following components in percentage by mass: 50.0-70.0% of glass fiber, 20.0-40.0% of high-liquidity PBT resin, 5.0-10.0% of acrylic acid diglycidyl ether graft elastic ionomer, and 0.1-0.3% of antioxidant. Compared with traditional plastic functional master batch, the prepared functional master batch has the advantages that modifying effect mutual damage caused by mutual shear abrasion of the glass fiber and a fire retardant in the processing process of reinforced halogen-free flame retardant PBT resin modifying systems is avoided, meanwhile the problem that the processing temperatures of the two modifying systems are not matched is solved, and the modifying effects of the two modifying systems are remarkably enhanced; and the master batch has the advantages of being easy to disperse and process, and can be easily mixed with the PBT resin in proportion for injection molding, and an excellent modifying 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 halogen-free 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 pl...

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Problems solved by technology

The following technical advantages can be obtained by using the method of processing the two masterbatches separately: ① avoiding the direct blending of glass fiber and phosphorus / nitrogen flame retardants to generate internal friction and heat generation, resulting in the decomposition of phosphorus / nitrogen flame retardants; ② It avoids the sharp drop of fiber length-to-diameter ratio caused by mutual shearing and abrasion between inorganic flame retardant synergist (such as zinc borate) and glass fiber; The problem of mismatching processing temperature of modified system melt blending; ④Using melt pultrusion technology to prepare reinforced masterbatch with larger fiber aspect ratio than traditional chopped glass fiber reinforced masterbatch; ⑤Using acrylic acid diglycidyl ether Dendritic ionomer is used as the carrier component of A masterbatch, and its reactive end group can have the greatest contact opportunity 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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