Flame retardant masterbatch (bromine series/halogen series), also known as flame retardant masterbatch, is the best flame retardant product in plastics, rubber and other resins today. One, the flame retardant masterbatch (masterbatch) is based on the flame retardant, which has undergone organic combination, modification and synergy of various flame retardant ingredients, and is mixed through a twin-screw or triple-screw extruder. A granular product made by , extrusion and granulation. Different from flame retardants, flame retardant masterbatch has the characteristics of being easy to add to the resin, clean and hygienic, high flame retardant efficiency, small addition amount, small impact on the mechanical properties of the resin, and less likely to cause delamination, patterning, precipitation and other undesirable phenomena after addition. , saving manpower, material costs and time and many other advantages.
Flame retardant masterbatch is a type of modified masterbatch with flame retardant as the core of the masterbatch. It mainly consists of four parts: flame retardant, heat stabilizer, carrier resin and other additives. , the details are as follows:
Flame retardants:
Flame retardants often choose organic halide-inorganic flame retardant composite systems, organic Halide – flame retardant antimony compound, smoke suppressant alumina and other complexes to produce synergistic effects. Commonly used organic halides as main flame retardants include octabromoether, tetrabromobisphenol A, decabromodiphenyl ether, hexabromocyclododecane, etc., which have excellent flame retardant effects. Inorganic flame retardants mainly include aluminum hydroxide, magnesium hydroxide, etc. They have low cost and no secondary pollution, but have poor flame retardant effect. The main flame retardants are antimony trioxide and aluminum dioxide (also smoke suppressant). Flame retardants generally account for about 50% of the masterbatch.
Heat stabilizer:
From the manufacture of flame retardant masterbatch to the molding of flame retardant products, the flame retardant must undergo at least two strong shears. Cutting and heating processes, and some organic halogen flame retardants, such as heat stabilizers of brominated polyvinyl chloride, can be used in flame retardant masterbatch. Commonly used heat stabilizers mainly include dibasic phosphorous acid, which has poor thermal stability. , will decompose during repeated heating, releasing hydrogen bromide (HBr) and some low-molecular organic compounds, which not only reduces the flame retardancy, but also discolors the product. To ensure product quality, heat stabilizers can be added to improve the heat resistance of the flame retardant. In principle, it is used for aluminum, organotin, epoxy compounds, additives, etc., and compounds are often used to exert their synergistic effects. The addition amount of heat stabilizer is about 6%.
Carrier resin:
Carrier resin is the matrix of the flame retardant masterbatch. It mainly plays a coating and bonding role for the flame retardant, making it flame retardant. The masterbatch is granulated and has a certain strength. The carrier resin has better compatibility with the flame-retardant resin, preferably of the same type as the flame-retardant resin, and has better fluidity than the flame-retardant resin. Polyolefins and their copolymers, such as LDPE, HDPE, PP, LLDPE, etc., can be used as carriers for polyolefin flame retardant masterbatch. The carrier resin of styrenic flame retardant masterbatch can be CPE, EVA., ACR, SBS. Due to the wide compatibility of this type of carrier resin, it can be compatible with almost all resins. The addition amount of carrier resin is generally about 40%.
Dispersant:
The function of the dispersant is to promote the dispersion of the flame retardant into particles, making it easy to disperse evenly during processing. The dispersant is required to have a lower melting point and melt viscosity, and to have good compatibility with the carrier resin and the flame-retardant resin. Commonly used dispersants include polyethylene wax, oxidized polyethylene wax, polypropylene wax, and a-methyl Styrene resin, stearic acid and its salts, paraffin wax, etc. In masterbatch production, a composite dispersion system with polyethylene wax as the main component is often used. The amount of dispersant added is generally about 3%.
Other additives:
In addition to the above four main components, external flame retardant masterbatches have different varieties and uses, and sometimes Lubricants, coupling agents, antioxidants, ultraviolet absorbers, antistatic agents, etc. should be added to increase the added value of the flame retardant masterbatch and become a multifunctional flame retardant masterbatch.
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