Halogen-free synergistic composite flame retardant and preparation method thereof

Abstract

The invention relates to the technical fields of light industrial and chemical materials, and in particular relates to a halogen-free synergistic composite flame retardant and a preparation method thereof. The halogen-free synergistic composite flame retardant is formed by performing an in-situ compounding chemical reaction on an anion intercalation-modified layered double hydroxide (LDH) and phosphonitrilic chloride trimer through a silane coupling agent, and has a layered structure. The preparation method of the halogen-free synergistic composite flame retardant comprises the following steps: step 1, preparing the anion intercalation-modified layered double hydroxide; and step 2, preparing the halogen-free synergistic composite flame retardant. The halogen-free synergistic composite flame retardant provided by the invention has more excellent flame-retardant and smoke suppressing comprehensive properties compared with the LDH or the phosphonitrilic chloride trimer; the flame retardant has very good compatibility with polymer materials such as epoxy resin in addition to good thermal stability and flame retardancy; the halogen-free synergistic composite flame retardant not only retains a cyclic structure of the phosphonitrilic chloride trimer, but also is used to prepare some polyacid anion intercalation-modified layered double hydroxides by a reconstruction process, and therefore the smoke suppressing effect can be improved while the flame retardant effect is improved.

Description

technical field [0001] The invention relates to the technical field of light industry and chemical materials, in particular to a halogen-free synergistic composite flame retardant and a preparation method thereof. Background technique [0002] With the development of science and technology, polymer materials have been industrialized on a large scale. Due to the wide variety of polymer materials, a wide range of sources, and the ability to meet various functional needs according to requirements, polymer materials are now widely used in construction, transportation, etc. Transportation, agriculture, electrical and electronic industries and other major areas of the national economy and people's daily life. However, polymer materials have poor temperature resistance, and a large amount of toxic and harmful substances will be produced during the combustion process, which will cause huge safety hazards and property losses. Therefore, in order to improve the flame retardancy of po...

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Problems solved by technology

However, due to the presence of a large number of hydroxyl groups on the surface of hydrotalcite-like materials, which makes it highly hydrophilic, when it comes to flame-retardant polymer materials, due to the difference in polarity, it has poor dispersion in polymer materials and is prone to agglomeration. This has an adverse effect on the flame retardancy and mechanical properties of the polymer, limiting its application

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