BDDP (Benzene-1,(1-methyl-eehylidene)bis[(3,-5di-bromo)-4-(2,3-dibrono-propoxy)]) inflaming-retarding polypropylene composite material and preparation method thereof

Abstract

The invention discloses an octabromine flame-retardant polypropylene composite material, which comprises: 50%-75% of polypropylene, 15%-30% of BDDP, 5%-20% of synergistic flame retardant, selective auxiliary Agent 2%~5%. Its preparation method is to mix part of polypropylene and selective additives in a high-speed mixer, and send the evenly mixed mixed material to material station A through a conveying pipeline; separately mix BDDP, synergistic flame retardant and the remaining part of polypropylene Put into different material stations B, C and D; input the proportion of materials used in the corresponding material station in the continuous metering system; start the continuous metering system, and continuously add the corresponding materials to the twin-screw extruder at the same time according to the corresponding ratio requirements mouth for continuous granulation. The length × width × height of the sample made of the composite material obtained in the present invention is 127mm × 12.7mm × 0.6mm, and the flame retardant effect of V-0 level can be achieved by referring to the test method of UL94, which meets the market demand, and its flame retardant The effect is stable, the melt finger is stable, the product quality is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an octabromo flame-retardant polypropylene composite material and a preparation method thereof. Background technique [0002] Polyolefin is a flammable substance because its oxygen index is only 17%-18%. In the use of many electrical insulation materials, flame retardancy is the prerequisite for its application. In the use of many electrical insulation materials, it is necessary to use extrusion-grade sheets with a thickness of 0.6mm-1.0mm, which is thinner than the minimum thickness of UL94 standard test strips of 1.6mm. If the spline 127mm×12.7mm×0.6mm cut from such a plate is used to test the flame retardant effect according to the test method of UL94V-0, it is generally difficult to meet the flame retardant requirements. [0003] The flame retardant modification of polypropylene mainly achieves the purpose of flame retardant by adding flame retardants to polyprop...

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Problems solved by technology

During the blending and modification process of the twin-screw extruder, it is easy to generate sticky lumps in the mixer, in the feeding pipeline and at the feed inlet of the extruder.

Cause BDDP to be unstable when added to polypropylene material

During the agglomeration process, the proportion of BDDP added to the polypropylene composite material will decrease accordingly, and the flame retardant stability of the product will decrease; Afterwards, the proportion of flame retardant in this product will increase correspondingly in an instant, resulting in poor plasticization of polypropylene during the blending process, which will further affect production interruption and increase production costs. At the same time, the instantaneous content of BDDP will increase, causing composite materials to melt The improvement of the index affects the stability of the melt index of the composite material, thereby affecting the uniform thickness of the sheet and the stability of flame retardancy in the downstream extrusion sheet forming process

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