Halogen-free flame retardant, halogen-free flame-retardant polyolefin composition and application thereof

Abstract

The invention relates to a halogen-free flame retardant, which is prepared by compounding an organic phosphoric acid compound with polyhydric alcohol according to the mass ratio of (1:10)-(10:1). A halogen-free flame-retardant polyolefin composition comprising the halogen-free flame retardant is prepared from 60-90 parts by weight of polyolefin resin, 10-40 parts by weight of halogen-free flame retardant and 0.05-2 parts by weight of antioxygen. The halogen-free flame-retardant polyolefin composition disclosed by the invention is used for preparing panel, fibre, film or foam materials. According to the invention, the traditional inorganic phosphoric acid substances are replaced by four micromolecular organic phosphoric acid substances used as the acid source and air source components of a halogen-free expansion flame-retardant system; organic phosphate is easier to carry out esterification reaction with polyhydric alcohol in the reaction process; due to the reaction extrusion blending manner, all fire retardant components and matrix resin are ensured to be dispersed uniformly; the blending efficiency is high; the pre-reaction phenomenon caused by long-time staying of materials in a screw can be prevented, thus being beneficial to improving the use efficiency of the flame retardant.

Description

technical field [0001] The invention relates to chemical products, in particular to a halogen-free flame retardant, a halogen-free flame-retardant polyolefin composition and applications thereof. Background technique [0002] Polyolefin is rich in raw materials, low in price, thermoplastic, and easy to form and process. It is a kind of polymer material with huge output and wide application. Among them, polyethylene, polypropylene, polystyrene and their copolymers are mainly used. Widely used in various production and living fields such as packaging, heat insulation, transportation, construction, automobiles, etc. Since polyolefin itself does not have an intermolecular cross-linking structure, it is easy to burn. Polypropylene, polyethylene, and polystyrene are all flammable materials, and their oxygen index is between 17.0-18.5. The molten droplets cause the flame to spread in a wide range, and polystyrene materials will release toxic smoke during the combustion process, wh...

AI Technical Summary

Problems solved by technology

[0004] The inorganic flame retardants, aluminum hydroxide and magnesium hydroxide, although they are halogen-free and non-toxic, require a very large amount of addition (usually more than 50%), resulting in very poor compatibility with the matrix, so they have not been used. See good prospects, such as the combination of magnesium hydroxide, aluminum hydroxide and hydrotalcite (see: JP1978-92855, JP1979-29305, JP1979-7768, JP25954 / 1981, JP1982-87462)

Images