Antistatic flame-retardant master batch and preparation method thereof

Abstract

The invention relates to the field of antistatic flame-retardant master batch processing, in particular to an antistatic flame-retardant master batch and a preparation method thereof. The antistatic flame-retardant master batch mainly comprises the following components in parts by mass: 20-50 parts of linear low density polyethylene (LLDPE), 2-10 parts of ethylene vinyl acetate (EVA), 1-8 parts ofpolyolefin elastomer (POE), 5-12 parts of conductive carbon black, 1-6 parts of coated red phosphorus, 0.1-4 parts of a processing aid and 2-10 parts of a compatilizer. The formula does not contain polyethylene wax or low-molecular dispersants, a conventional repeated batch-type internal mixing feeding mode is changed, and feeding frequency is reduced, so that the problem of bearing performance defects of the downstream products caused by too much additives is solved, stability of product quality is improved, and comprehensive cost is reduced. Through the arrangement of double-shaft mixing rotary shafts and through a multi-section sectional design, the edges of the mixing stirring paddles on a mixing section are of a two-edge structure, materials are uniformly mixed through the mixing section in a movement process, is subjected to exhausting, and then are sent into the extrusion granulating machine for molding, and the materials do not need to be pressed after mixing in the mixing section, so that the shear damage force to a carbon black structure in the mixing process is reduced.

Description

technical field [0001] The invention relates to the field of antistatic flame retardant masterbatch processing, in particular to an antistatic flame retardant masterbatch and a preparation method thereof. Background technique [0002] Flame retardant masterbatch, also known as flame retardant masterbatch, fireproof masterbatch, is a kind of product produced to meet the fireproof requirements of plastic and rubber products. At present, the production equipment for producing polyethylene antistatic flame retardant masterbatch is mainly a tipping bucket kneader, a single screw unit or a parallel twin screw extruder. Because the mixed materials are mixed in the internal mixing chamber, the original materials need to be removed and then put into the materials for mixing again during the production process. The state of the materials is easily affected by the order of feeding, mixing temperature, charging capacity, rotor speed, Influenced by factors such as mixing time and discon...

AI Technical Summary

Problems solved by technology

At present, the production equipment for producing polyethylene antistatic flame retardant masterbatch is mainly a tipping bucket kneader, a single screw unit or a parallel twin screw extruder. Because the mixed materials are mixed in the internal mixing chamber, the original materials need to be removed and then put into the materials for mixing again during the production process. The state of the materials is easily affected by the order of feeding, mixing temperature, charging capacity, rotor speed, Influenced by factors such as mixing time and discontinuous work, there are disadvantages of batch instability; when using parallel twin-screw extruders to process antistatic and flame retardant masterbatches, carbon black needs to be pre-dispersed first, and carbon black flying causes The operating environment is poor, and the screw combination needs to adjust the shear force according to the carbon black content, and the distance between the barrel and the screw is small, so it is necessary to add a large amount of polyethylene wax or oil dispersant to increase the wettability of the compound, which will affect the later pressure bearing performance ; and when using a twin-screw extruder to process conductive carbon black, in order to achieve a good dispersion effect, the amount of carbon black added will be limited, it is difficult to exceed 40%, and the production capacity per unit time is low

The current method of using a large amount of polyethylene wax or low-molecular additives as a dispersant in the production formula and the above-mentioned production and processing methods lead to low production efficiency, poor batch stability of the banburying process, and the use of dispersants At the same time, it affects the pressure bearing performance of polyethylene pipes in the later stage, so that the product quality stability obtained under the existing polyethylene antistatic flame retardant masterbatch production formula and method is poor, and the comprehensive cost in the production process is high.

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