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Modified cyanate coating

A cyanate ester and modification technology, applied in the coating and other directions, can solve the problems such as the inability of graphene to disperse and the inability of materials to achieve the modification effect.

Active Publication Date: 2019-06-28
浙江中科应化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong π-π interaction between graphene sheets, graphene sheets are extremely prone to irreversible agglomeration. In graphene-modified materials, graphene cannot be dispersed in the matrix material in a single-layer state, and even appears Obvious agglomeration, making the material unable to achieve the expected modification effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] First, the graphite or graphene material is oxidized by the Hummers method to obtain graphene oxide. 0.2 g of graphene oxide was ultrasonically dispersed in 100 ml of tetrahydrofuran solution for 10 minutes, and a graphene oxide colloidal solution was obtained after ultrasonic dispersion.

[0069] Then add 0.4 g of maleic anhydride to the graphene oxide colloidal solution, and ultrasonically disperse for 10 minutes. The graphene oxide / maleic anhydride / THF mixture was irradiated in a Co-60 source with a radiation dose of 30 kGy and a dose rate of 15 Gy / min. The modified graphene oxide is obtained after the insoluble matter in the mixed solution after irradiation is suction-filtered, washed to neutrality and dried.

[0070] Weigh 0.2 g of modified graphene oxide, soak in 1 mmol / L KOH aqueous solution and 1 mmol / L hydrochloric acid solution for 5 minutes and 10 minutes respectively for hydrolysis. After the product was suction-filtered and washed with deionized water to ...

Embodiment 2

[0076] Take 1g of graphene modified by epoxy group, its structure is as follows figure 2 Shown, through titration and theoretical calculation (graphene surface density is 0.77mg / m 2 meter), the areal density of epoxy groups on its surface is 12.4nmol / cm 2 . The graphene modified by this epoxy group is added in the tetrahydrofuran of 100ml, stir; Get 100g tetramethyl bisphenol F type cyanate and graphene tetrahydrofuran solution and stir again, obtain modified cyanate coating, wait After the solution is completely volatilized, it solidifies and forms. The properties of the cured product are shown in Table 1.

[0077] figure 2 Chemical structure of epoxy-functionalized graphene in Example 1.

Embodiment 3

[0079] Take 1g of graphene modified by epoxy group, its structure is as follows image 3 Shown, through titration and theoretical calculation (graphene surface density is 0.77mg / m 2 meter), the areal density of epoxy groups on its surface is 18.5nmol / cm 2 . Add the epoxy group-modified graphene into 80ml of tetrahydrofuran, and stir evenly. Then take 80g of tetramethylbisphenol F-type cyanate and graphene solution and stir evenly to obtain a modified cyanate coating, and after the solution is completely volatilized, solidify and form. The properties of the cured product are shown in Table 1.

[0080] image 3 Epoxy functionalized graphene chemical structure in embodiment 2

[0081] Table 1 Performance comparison table of cured products of modified cyanate ester coatings

[0082]

[0083]

[0084] Note: the structural formula of cyanate in Table 1 is as follows:

[0085]

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Abstract

The invention provides a modified cyanate coating. The modified cyanate coating contains epoxy group-modified graphene, cyanate resin and a non-reactive diluent, namely tetrahydrofuran. Compared withthe prior art, the modified cyanate coating has the advantages that the cyanate coating is modified with epoxy group-modified graphene with a certain chain segment length, and the surface of epoxy group-modified graphene contains a sufficient amount of epoxy chain segments, so that the aggregation among slice layer is blocked, and the sufficient steric hindrance for the dispersion of graphene is realized; and meanwhile, the liquidation of a graphene nano-material can be realized by virtue of an epoxy alkyl chain with a specific length, so that the uniform dispersion of liquefied epoxy group-modified graphene in the cyanate resin is promoted by virtue of the ultralow viscosity of the cyanate resin in a high-temperature curing process; besides, an epoxy functional group on the surface of graphene can react with a cyanate intermediate, namely a triazine ring in the curing process of the cyanate resin, so that the curing process of the cyanate resin is accelerated.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a modified cyanate coating. Background technique [0002] Cyanate resin was developed in the 1960s. It is a kind of material containing two or more cyanate functional groups (-OCN) in its molecular structure. After the resin is cured, it will form a network mainly composed of triazine ring structure. shaped high polymer. Compared with commonly used adhesive resin materials such as epoxy resin and polyurethane, cyanate ester cured products have excellent heat resistance and mechanical properties. In addition, the cyanate ester cured product also has the characteristics of low water absorption, low molding shrinkage, heat and humidity resistance, flame retardancy, good adhesion, and excellent wave permeability. At present, cyanate ester materials have been used in high-performance polymer-based composite materials and high-temperature resistant coating materials. [0003] Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/04C09D7/62
Inventor 柳美华尹园郑春柏魏巍张依帆邓鹏飏
Owner 浙江中科应化科技有限公司
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