Flame-retardant PVC masterbatch and preparation method thereof

Abstract

The invention discloses a flame-retardant PVC color masterbatch, which comprises the following components in parts by weight: 65-70 parts of composite PVC flame-retardant resin, 17-21 parts of core-shell type pigment and filler, and 9-9 parts of diphenylmethane diisocyanate 12 parts, 5-7 parts of dispersant, 3-4 parts of methyl trifluoroacetate, 2-4 parts of plasticizer, 100 parts of absolute ethanol. In the present invention, the flame retardant vinyl diethyl phosphate is directly grafted and polymerized on the matrix resin, and at the same time, silicone functional groups are grafted on the matrix resin. Since the vinyl diethyl phosphate decomposes to generate phosphorus oxyacids, Phosphorus oxyacids can catalyze the dehydration of hydroxyl-containing compounds to form charcoal covering the surface of the substrate, forming a heat-insulating and oxygen-insulating protective layer, thereby playing a flame-retardant role; at the same time, the siloxane bond of the polymer decomposes at high temperature to form Si‑ OH bond, adjacent Si‑OH bonds are dehydrated and cross-linked at high temperature to form a gel film coated on the surface of the polymer, which makes the matrix resin itself have high flame retardancy, which in turn makes the flame retardancy of different parts of the masterbatch same burning capacity.

Description

technical field [0001] The invention belongs to the field of color masterbatch preparation, and relates to a flame-retardant PVC color masterbatch and a preparation method thereof. Background technique [0002] The method of plastic coloring can be divided into body coloring method and coloring preparation method, but the dispersibility of the pigment is poor, and the coloring effect of the dust is not ideal. Therefore, the problem of pigment dispersibility is effectively solved by the masterbatch coloring method, in which the masterbatch is passed Add pigments, dispersants and additives to the carrier resin, and then prepare by melting and mixing, so that the prepared color masterbatch has the color of the pigment itself, but when the pigment is directly mixed with the carrier resin by mechanical stirring, although the dispersant is added, However, the mixed color material still cannot fully achieve a uniform effect, and in order to achieve the flame retardant performance o...

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Problems solved by technology

[0003] The object of the present invention is to provide a flame-retardant PVC color masterbatch and its preparation method. The color masterbatch directly grafts the flame retardant vinyl diethyl phosphate on the matrix resin, and at the same time grafts silicone on the matrix resin. Oxyalkylene functional groups, due to the decomposition of vinyl diethyl phosphate to generate phosphorus oxyacids, phosphorus oxyacids can catalyze the dehydration of hydroxyl-containing compounds into charcoal and cover the surface of the substrate, forming a heat-insulating and oxygen-insulating protective layer, and The formed isolation protective layer has poor thermal conductivity, which makes the temperature of the high polymer lower, thereby playing a flame-retardant role; at the same time, the siloxane bond of the polymer decomposes at high temperature to form a Si-OH bond, and the adjacent Si-OH bond It is dehydrated and cross-linked at high temperature to form a gel film to cover the surface of the polymer, so that the matrix resin itself has high flame retardancy, and then makes the flame retardancy of different parts of the color masterbatch the same, which is different from the traditional direct smelting Compared with the addition of flame retardants in the process, the flame retardant ability is evenly distributed, which solves the problem that the flame retardant performance of different parts of the color masterbatch is different due to the uneven dispersion of the flame retardant when the flame retardant is directly added to the traditional flame retardant masterbatch.

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