High-limit oxygen index halogen-free flame-retardant PP material and preparation method thereof

Abstract

The invention discloses a high-limit oxygen index halogen-free flame-retardant PP material. The high-limit oxygen index halogen-free flame-retardant PP material is prepared from 100 parts by weight ofhomopolymerized PP, 5-10 parts by weight of MCA (melamine cyanurate), 5 to 10 parts by weight of MPP (melamine polyphosphate), 5 to 12 parts by weight of a triazine charring agent, 0.2 to 1.0 part byweight of a coupling agent, 3 to 6 parts by weight of a flame retardant synergist and 0.1 to 0.5 parts by weight of an antioxidant. The invention also discloses a preparation method of the high-limitoxygen index halogen-free flame-retardant PP material. The preparation method comprises selecting a specific matrix homopolymerized PP, and adding a flame retardant which is composed of an acid source, a carbon source, a gas source and a flame retardant synergist and is subjected to coupling agent surface treatment into the homopolymerized PP. The high-limit oxygen index halogen-free flame-retardant PP material improves the compatibility between the flame retardant and the PP matrix, solves the problems of surface frosting and precipitation of the flame-retardant PP material, has a high limitoxygen index under less use of the flame retardant, has the advantages of simple processes, good processing performances, no dripping and environmental friendliness and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of halogen-free flame-retardant PP materials, in particular to a halogen-free flame-retardant PP material with a high limiting oxygen index and a preparation method thereof. Background technique [0002] Polypropylene (PP) is an important raw material in the plastic processing industry. However, polypropylene is a flammable polymer material. It is reported that many fires caused by polypropylene products. Therefore, flame retardant modification of polypropylene has very important practical significance. [0003] In the flame retardant technology of PP, halogen-free intumescent flame retardant (IFR) has high flame retardant efficiency. A hotspot of fuel research and development. However, the halogen-free intumescent flame retardant has the following disadvantages: 1. It has a large moisture absorption capacity, which makes the water resistance of the polymer material worse, and the flame retardant effect is also redu...

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Problems solved by technology

However, the halogen-free intumescent flame retardant has the following disadvantages: 1. It has a large moisture absorption capacity, which makes the water resistance of the polymer material worse, and the flame retardant effect is also reduced; 2. The halogen-free intumescent flame retardant and the matrix material Poor compatibility leads to a sharp drop in the mechanical properties of polymer materials; 3. The dispersion of halogen-free intumescent flame retardants is poor, and their relative molecular weights are generally small and easy to migrate to the surface of the material, resulting in poor appearance and poor mechanical properties; 4. Adding a large amount will increase the cost, and also affect the performance of raw materials

[0004] In CN104693485A "A Halogen-free Expandable Composite Flame Retardant and Its Application in High-Density Polyethylene" discloses a composite flame retardant composed of an acid source, a carbon source, a gas source and a synergist, and also A composite material made of the compounded flame retardant and high-density polyethylene is disclosed. The composite material has the advantages of high flame retardant efficiency, low cost, good compatibility with the matrix and simple preparation process, but the composite material needs to be added A large amount of compound flame retardants, and additional fillers need to be added

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