A kind of modified polyurea coating

A modification and polyurea technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems that materials cannot be modified, graphene cannot be dispersed, etc.

Active Publication Date: 2021-03-23
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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  • A kind of modified polyurea coating
  • A kind of modified polyurea coating
  • A kind of modified polyurea coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 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 15 minutes, and a graphene oxide colloidal solution was obtained after ultrasonic dispersion.

[0065] Then add 0.4 g of maleic anhydride to the graphene oxide colloidal solution, and ultrasonically disperse for 15 minutes. The graphene oxide / maleic anhydride / THF mixture was irradiated in a Co-60 source with a radiation dose of 40 kGy and a dose rate of 25 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.

[0066] 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～ Embodiment 5

[0073] According to the method of Example 1, the amino-modified graphene of component B in Table 1 was prepared. The components and test results of the modified polyurea coatings prepared in Examples 2 to 5 are shown in Table 1.

[0074]

[0075]

[0076] Note: The tensile test sample is casted with the polyurea coating in the embodiment, the size is 50×5×2 (mm×mm×mm), the curing temperature is room temperature, and the curing time is 48h.

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Abstract

The invention provides modified polyurea paint which comprises a first component and a second component. The first component is a prepolymer formed by reaction of a diisocyanate compound and oligomerglycol, and the second component is amino modified graphene. Compared with the prior art, the modified polyurea paint has the advantages that the length of a carbon chain on a grafted chain is controlled, liquidation and high flowability of amino modified graphene materials are realized, and monolayer dispersion of the amino modified graphene materials in solvents and composite material matrixes is ensured. Besides, the amino modified graphene serving as the second component is added into a polyurea system, chain extension and crosslinking functions can be achieved, and the mechanical and thermal properties of the modified polyurea paint can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of polyurea coatings, in particular to a modified polyurea coating. Background technique [0002] Polyurea is developed on the basis of polyurethane, a class of compounds with urea groups (-NH-C(=O)-NH-) in the chemical structure produced by the reaction of amino compounds and isocyanates. Due to the high reactivity of the active hydrogen in the terminal amino group and isocyanate, the reaction rate is fast, so the curing speed of polyurea is significantly faster than that of polyurethane, and its curing process is very little affected by moisture. Walking solidification can be achieved in the middle, and it is almost not affected by the surrounding environment. In addition, polyurea materials also have good mechanical, anti-corrosion and heat-resistant properties. When used as a coating, polyurea materials have good performance both in the construction process and in the use process, and have been widely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/02C09D7/62
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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