A kind of high-toughness halogen-free cyanate composite material and preparation method thereof

Abstract

The invention discloses a high-toughness halogen-free cyanate composite material. Phosphorus-containing cyanate resin and modified carbon nanotubes are added into a reaction vessel at the same time, mixed at high temperature, and then poured into a preheated mold. Debubble under vacuum at 150°C for 30 minutes, then rise from 160°C to 220°C for curing, after curing, treat at 250°C for 5-6 hours, and then cool to room temperature for preparation. The phosphorous cyanate resin prepared by the present invention is evenly distributed with the conjugated structure formed by three imino groups and benzene rings, thereby effectively improving the toughness of polyphenol-based phosphate, while the phosphorous cyanate resin contains three cyanides The ester groups are distributed in three different directions, and can be polymerized in three directions, which improves the branching ability, thereby improving the toughness of the polymer, and at the same time, a large number of epoxy groups are introduced into the modified carbon nanotubes prepared , can react with the cyanate group on the phosphorous cyanate resin, improve the crosslinking degree of the composite material, and then greatly enhance the toughness and strength of the material.

Description

technical field [0001] The invention belongs to the field of cyanate material preparation, and relates to a high-toughness halogen-free cyanate composite material and a preparation method thereof. Background technique [0002] Cyanate resin is a new type of thermosetting resin with two or more cyanate functional groups in the molecular structure developed in the 1960s. Now bisphenol A cyanate resin is commonly used. In order to achieve the resistance of the resin Inflammability, halogens are usually added to the resin, but halogen-containing flame-retardant materials will produce a lot of smoke and toxic corrosive hydrogen halide gas during the flame-retardant process, causing secondary hazards, and the existing bisphenol A cyanide The toughness of the composite material prepared by ester resin cannot meet the demand. In order to improve the toughness of bisphenol A cyanate resin, a toughening agent is usually added therein. Carbon nanotubes are widely used in cyanic acid du...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of high-toughness halogen-free cyanate composite material and preparation method thereof, the conjugated structure that three imino groups and benzene ring form are uniformly distributed in the prepared phosphorus-containing cyanate resin, and then effectively improved The toughness of polyphenol-based phosphate, while the phosphorus-containing cyanate resin contains three cyanate groups, distributed in three different directions, can be polymerized in three different directions, which improves the branching ability, thereby improving The toughness of the polymer is improved, and a large number of epoxy groups are introduced into the modified carbon nanotubes prepared at the same time, which can react with the cyanate groups on the phosphorus-containing cyanate resin and improve the crosslinking degree of the composite material. In turn, the toughness and strength of the material are greatly enhanced, and two adjacent phosphorous cyanate resins are cross-linked through modified carbon nanotubes, because the three cyanate groups of the phosphorous cyanate resins are in different Direction, and then make the phosphorus-containing cyanate resin and the modified carbon nanotubes undergo branching reactions in different directions to form a hyperbranched network structure, so that the prepared composite material has an alternating structure of carbon nanotubes and phosphorus-containing cyanate. Carbon nanotubes have high toughness, mechanical strength and corrosion resistance, and a large number of modified carbon nanotubes are distributed in hyperbranched polymers, thereby improving the toughness of phosphorus-containing cyanate, thereby effectively solving the problem of existing technical problems. Directly mixing carbon nanotubes and cyanate resin directly in the process can enhance the toughness, but because the two cannot be polymerized, the carbon nanotubes are not uniformly dispersed, and the toughening effect is not significant, and due to the bisphenol A cyanate The toughness of the resin itself is low, so that the toughness of the toughened material still cannot meet the demand

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