Halogen-free flame-retardant composite material and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant composite material which comprises the following components in parts by weight: 25-40 parts of modified rice hull powder, 27-46 parts of modified bagasse, 10-20 parts of p-diacetylene-benzene, 5-10 parts of triethyl borate, 80-100 parts of organic silicone oxygen resin, 10-20 parts of magnesium hydrate, 10-20 parts of aluminum hydroxide, 1-4 parts of a coupling agent and the like. A preparation method comprises the following steps: (1) weighing p-diacetylene-benzene, triethyl borate and organic silicone oxygen resin according to the formula, and melting; (2) mixing a polyethynylbenzene polymer with magnesium hydrate, aluminum hydroxide, an antioxidant and the coupling agent, melting in a mixing mill, putting polytetrafluoroethylene into the mixing mill, and melting; and (3) putting a granular material and a lubricant into a press vulcanizer, and performing hot-pressing at 8-15MPa, thereby obtaining the halogen-free flame-retardant composite material. As the organic silicon oxygen resin is generated, the flame-retardant effect and mechanical properties of the composite material can be improved.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a halogen-free flame-retardant composite material and a preparation method thereof. Background technique [0002] Polymer materials are widely used in various fields, but they are easy to burn and drip when exposed to fire. Therefore, it is necessary to add flame retardants to improve their flammability. There are many types of flame retardants, which are divided into Additive flame retardant and reactive flame retardant. [0003] Additive flame retardants are added to polymers by mechanical mixing to make polymers flame retardant. At present, additive flame retardants mainly include organic flame retardants and inorganic flame retardants. Organic flame retardants are represented by bromine-based, phosphorus-nitrogen-based and organic-nitrogen systems, and inorganic flame retardants are mainly antimony trioxide, magnesium hydroxide, magnesium hydroxide and other flame retardan...

AI Technical Summary

Problems solved by technology

[0005] For a long time, due to its simple process, additive flame retardants have been the first choice for the production of flame-retardant composite materials. Among them, halogenated flame retardants have always been one of the important flame retardants. However, due to the release of toxic fumes when burning, It is easy to cause secondary hazards and bring great difficulties to fire fighting, escape and recovery work

However, in order to achieve a certain flame-retardant effect for polymer materials, a large amount of magnesium hydroxide or aluminum hydroxide is required, which will not only make the processing and formability of the composite material worse, but also cause a significant drop in the mechanical properties of the matrix material.