High-toughness halogen-free cyanate composite material and preparation method thereof

Abstract

The invention discloses a high-toughness halogen-free cyanate composite material which is prepared by simultaneously adding a phosphorus-containing cyanate resin and modified carbon nanotubes into a reaction container, carrying out high-temperature mixing and dissolving, pouring the mixture into a preheated mold, carrying out debubbling for 30 minutes at 150 DEG C in vacuum, increasing the temperature to 220 DEG C from 160 DEG C to carry out curing, carrying out treatment for 5-6 hours at 250 DEG C after curing, and carrying out cooling to room temperature. Three conjugated structures formed by imino groups and benzene rings are uniformly distributed in the phosphorus-containing cyanate resin disclosed by the invention, and furthermore the toughness of polyphenol phosphate is effectively improved; meanwhile, the phosphorus-containing cyanate resin comprises three cyanate groups which are distributed in three different directions and can be polymerized in three directions, so that the branching capability is improved, and furthermore the toughness of a polymer is improved; and meanwhile, a great amount of epoxy groups are introduced to the prepared modified carbon nanotubes, and theepoxy groups can be reacted with the cyanate groups on the phosphorus-containing cyanate ester resin, so that the crosslinking degree of the composite material can be increased, and furthermore the toughness and the strength of the material can be greatly improved.

Description

Technical field [0001] The invention belongs to the field of cyanate ester material preparation, and relates to a high-toughness halogen-free cyanate ester composite material and a preparation method thereof. Background technique [0002] Cyanate ester resin is a new type of thermosetting resin with two or more cyanate ester functional groups in its molecular structure developed in the 1960s. Nowadays, bisphenol A type cyanate ester resin is commonly used, in order to realize the resistance of the resin. Flammability, halogen is usually added to the resin, but halogen-containing flame retardant materials will generate 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 the acid ester resin cannot meet the demand. In order to improve the toughness of the bisphenol A cyanate ester resin, a toughening agent is usually added to it....

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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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