High-efficiency flame-retardant PP composition special for LFT-D

Abstract

The invention discloses a high-efficiency flame-retardant PP composition special for LFT-D. The composition is prepared from, by weight, 28-68% of polypropylene, 18-21% of halogen-free flame retardant, 10-40% of glass fibers, 2-5% of maleic anhydride grafted polypropylene, 1-4% of maleic anhydride grafted ethylene-octylene copolymer, 0.4-0.7% of lubricant EBS, 0.3-0.7% of main antioxidant and 0.3-0.6% of auxiliary antioxidant. The halogen-free flame retardant is prepared by mixing, by weight, 26-71% of piperazine pyrophosphate, 28-69% of melamine pyrophosphate MPP and 1-5% of zinc salt and then conducting surface treatment with a silane coupling agent or silicone oil. The flame retardant contained in the high-efficiency flame-retardant PP composition special for the LFT-D belongs to phosphorus-nitrogen system expansion-type Halogen-free flame retardants, has efficient flame retardant properties, and causes low corrosion to dies, small amount of smoke during burning and small damage tothe human body and the environment; compared with flame retardants of the same type on the market, on the promise of having the same flame retardant properties, the addition quantity of the halogen-free flame retardants is lower, and the influences on the mechanical properties of the materials are smaller.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency flame-retardant PP composition for LFT-D, and in particular relates to a high-efficiency flame-retardant PP composition for LFT-D. Background technique [0002] Polypropylene is one of the most commonly used thermoplastic materials. As the fastest-growing general-purpose plastic, it is non-toxic, odorless, low-density, light, and has the advantages of easy processing, good electrical insulation, and chemical corrosion resistance. Various fields of the economy, such as household appliances, automotive interior and exterior trim, fitness equipment, office supplies, daily necessities, toys and sanitary ware, have been widely used. With the development of industry, polypropylene plays an increasingly important role in plastics. However, polypropylene has some shortcomings in the application process, such as low strength, stiffness, heat resistance and flame retardancy, which often cannot meet...

AI Technical Summary

Problems solved by technology

However, the existing LFT-D materials also have some shortcomings, such as poor flame retardancy and low safety, which limit their wide application to a certain extent.

In addition, when long glass fibers are added, the flame retardancy of LFT-D materials becomes more difficult due to the "wick effect" of glass fibers

In order to improve the flame retardancy of LFT-D materials, existing manufacturers will add halogen-based flame retardants to their raw materials; but this usually requires the addition of more halogen-based flame retardants to achieve better flame-retardant effects. In turn, adding more flame retardants has a greater impact on the mechanical properties of the material, so it is difficult to take into account the flame retardancy and mechanical properties of the material

Secondly, when more halogenated flame retardants are added, they will produce smoky, highly toxic hydrogen halides and other halogen-containing organic substances when burned, which is extremely harmful to the human body.

In addition, the addition of halogenated flame retardants did not well alleviate the "wick effect" of glass fiber

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