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A kind of modified polyurea coating

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

Active Publication Date: 2021-03-05
浙江中科应化科技有限公司
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  • 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
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Effect test

Embodiment 1

[0069] 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.

[0070] 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.

[0071]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 n...

Embodiment 2

[0078] Take by weighing 20g amino-modified graphene (structural formula such as figure 2 shown, prepared according to the method of Example 1), its surface amino surface density is 20nmol / cm 2 , and 80g of amino-terminated polyether Jeffamine D-2000 were stirred evenly to prepare component A, and then 100g of 4,4'-diphenylmethane diisocyanate (MDI) component B was added and mixed uniformly to obtain modified polyurea coating. The properties of the modified polyurea coating cured product are shown in Table 1.

Embodiment 3

[0080] Take by weighing 50g amino-modified graphene (structural formula such as image 3 shown, prepared according to the method of Example 1), its surface amino surface density is 15nmol / cm 2 , and 50g of amino-terminated polyether Jeffamine T-5000 were stirred uniformly to prepare component A, and then 120g of isophorone diisocyanate (IPDI) component B was added and mixed uniformly to obtain a modified polyurea coating. The properties of the modified polyurea coating cured product are shown in Table 1.

[0081] Table 1 Polyurea coating cured properties

[0082]

[0083] Note: The general aromatic polyurea component A in Table 1 is TDI prepolymer, the mass is based on 100 parts, the second component is 69 parts of two-terminal amino polyether D-2000, 3 parts of three-terminal amino polyether T-5000 and 28 parts of chain extender 100.

[0084] As can be seen from Table 1, the present invention uses chemically modified, liquefied and monodisperse graphene materials as f...

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Abstract

The present invention provides a modified polyurea coating material, which comprises a component A and a component B, wherein the component A comprises amino-modified graphene and an amino-terminatedpolymer, the component B is a diisocyanate-based compound and / or a prepolymer, and the prepolymer is formed by carrying out a reaction on a diisocyanate-based compound and an oligomer diol. Compared with the coating material in the prior art, the coating material of the present invention has the following characteristics that the liquefaction and the high fluidity of the amino-modified graphene material are achieved by controlling the length of the carbon chain on the graft chain so as to ensure the single-layer dispersion of the amino-modified graphene material in the solvent and the composite material matrix, and by adding the amino-modified graphene as the component A to the polyurea system, the amino-modified graphene can provide effects of chain extension and cross-linking, and participates in the curing of the polyurea coating by carrying out the reaction with the -NCO functional group on the diisocyanate-based compound to further improve the stability of the nanometer material in the matrix resin so as to significantly improve the mechanical and thermal properties of the modified polyurea coating.

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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IPC IPC(8): C09D175/02C08G18/76C08G18/75C08G18/66C08G18/50C08G18/38
CPCC08G18/3819C08G18/5024C08G18/6666C08G18/755C08G18/7671C09D175/02
Inventor 柳美华郑春柏尹园魏巍张依帆邓鹏飏
Owner 浙江中科应化科技有限公司
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