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Method for coating surface of organic pigment

A technology of organic pigments and surface coating, which is applied in the direction of organic dyes, inks, household appliances, etc., can solve the problems of high cost, monodispersity of organic pigments, etc., achieve good dispersion performance and heat resistance, and have wide application prospects.

Inactive Publication Date: 2018-11-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then, the process of inorganic coating must first solve the problem of monodispersity of organic pigments, and the cost of coupling agents / surfactants is usually relatively high

Method used

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  • Method for coating surface of organic pigment
  • Method for coating surface of organic pigment

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Experimental program
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Effect test

Embodiment 1

[0020] This embodiment specifically includes the following steps:

[0021] Step 1) Graphene oxide (GO) prepared by the chemical oxidation stripping method is formulated into an aqueous solution of 100mL 1mg / mL;

[0022] Step 2) Disperse 10g of organic pigment red P.R.170 into a 100mL beaker, use mechanical stirring to disperse and place four beakers in an ultrasonic device for dispersion;

[0023] Step 3) Under the condition of high-speed stirring, slowly add the solution of step 1) to the solution of step 2). figure 1 It is the electron microscope picture of the product obtained;

[0024] Step 4) Centrifuge the obtained product, separate the precipitate, wash the precipitate three times alternately with deionized water and ethanol, and then place it at 60°C for 12 hours in vacuum to obtain the organic pigment red P.R.170 / GO nanocomposite.

Embodiment 2

[0026] Step 1) the graphene oxide prepared by the chemical oxidation stripping method is formulated into an aqueous solution of 100mL 1mg / mL;

[0027] Step 2) Disperse 10g of organic pigment red P.R.170 into a 100mL beaker, use mechanical stirring to disperse and place four beakers in an ultrasonic device for dispersion;

[0028] Step 3) carrying out hydroxylamine reduction to the graphene oxide aqueous solution, the specific steps are: add 1.4mL ammonia water and 0.2g hydroxylamine hydrochloride successively to the graphene oxide in step 1), and then place it in a constant temperature water bath at 90°C for 30 minutes to obtain chemical Reduced graphene oxide aqueous solution (rGO).

[0029] Step 4) Under the condition of high-speed stirring, slowly add the chemically reduced graphene oxide aqueous solution to the solution in step 2), and after the solution is added dropwise, continue to maintain the high-speed stirring state, and keep the temperature at 40°C;

[0030] Step ...

Embodiment 3

[0032] Step 1) the graphene oxide prepared by the chemical oxidation stripping method is formulated into an aqueous solution of 100mL 1mg / mL;

[0033] Step 2) disperse 10g of azobenzene pigment into four 100mL beakers, use a ball mill for ball milling and disperse and place the four beakers in an ultrasonic device for dispersion;

[0034] Step 3) carrying out hydroxylamine reduction to the graphene oxide aqueous solution, the specific steps are: add 1.4mL ammonia water and 0.2g hydroxylamine hydrochloride successively to the graphene oxide in step 1), and then place it in a constant temperature water bath at 90°C for 30 minutes to obtain chemical Reduced graphene oxide aqueous solution (rGO).

[0035] Step 4) Under the condition of high-speed stirring, slowly add the chemically reduced graphene oxide aqueous solution to the solution in step 2), and after the solution is added dropwise, continue to maintain the high-speed stirring state, and keep the temperature at 40°C;

[00...

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Abstract

A method for coating the surface of an organic pigment is characterized in that an aqueous solution of graphene oxide or an aqueous solution of chemically reduced graphene oxide is added into the organic pigment dispersed in water to achieve full contact in order to achieve the surface coating of the organic pigment and obtain a graphene oxide or chemically reduced graphene oxide coated organic pigment product. The pi-pi interaction of the hydrophobic part, being a benzene ring-like structure, of the graphene oxide substrate and all benzene ring structures contained in the organic pigment andthe hydrophilic group at the edge of the graphene oxide substrate make the graphene oxide coated organic pigment have a good dispersion performance and a good heatproof performance in a water solventand have a broad application prospect.

Description

technical field [0001] The present invention relates to a technique in the field of chemistry and chemical engineering, in particular to a method for coating the surface of an organic pigment by using graphene oxide or chemically reduced graphene oxide. Background technique [0002] Organic pigments have the characteristics of various varieties, wide color spectrum, bright colors, bright hues, and non-toxicity, and are widely used in coatings, inks and plastics. With the restrictions on organic solvents and oil-based paints imposed by the national environmental protection department, the use of water-based solvents will become more and more extensive. In order to give full play to various properties of pigments such as hiding rate, coloring rate, etc., its monodispersion in aqueous solvent is very important. The existing technologies are mainly to modify the surface of organic pigments by coating with inorganic substances or by coupling agents / surfactants. Then, the proces...

Claims

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Application Information

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IPC IPC(8): C09B67/08C09D7/41C09D11/037C09D11/322
CPCC09B67/0007C09D7/41C09D11/037C09D11/322
Inventor 吴海霞郭守武
Owner SHANGHAI JIAO TONG UNIV
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