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Quasi graphene oxide, quasi graphene and pearlescent pigment based on quasi graphene oxide or quasi graphene

A pearlescent pigment and graphene technology, applied in graphene, chemical instruments and methods, cosmetics, etc., can solve the problems of poor surface activity, large particle size, small specific surface area, etc., and achieve high hiding power and pure color saturation Effect

Active Publication Date: 2017-06-27
FUJIAN KUNCAI MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a major technical problem in the preparation of large particle size synthetic mica pearlescent pigments, that is, the large particle size synthetic mica powder has a large particle size, small specific surface area, short milling time, and poor surface activity, making the hydrolyzed coating very difficult. Difficult to carry out, when the coating is formed, a large amount of free TiO is produced 2 , which seriously affects the quality of pearlescent pigments, and even does not produce pearlescent effect

Method used

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preparation example Construction

[0031] (2) Preparation of the coating layer: adding a metal salt solution to the graphene oxide-like or graphene-like dispersion, controlling the temperature and pH of the solution, and covering the surface of the graphene oxide-like or graphene-like substrate with an oxide coating layer.

[0032] (3) Preparation of pearlescent pigments: After covering the coating layer on the surface of the substrate, the pearlescent pigments are prepared by filtering, washing, drying and calcining.

[0033] In step (1) of the present invention, generally oxidize flake graphite powder with potassium permanganate, carry out intercalation to graphite powder with the vitriol oil, with ball milling method, ultrasonic method, mechanical shearing method, explosion method, laser pulse method, Electrochemical methods are used to exfoliate graphite oxide-like to prepare graphene oxide-like. Graphene oxide-like with suitable size can be obtained by adjusting the conditions of intercalation and exfolia...

Embodiment 1

[0037] Add 500ml of concentrated sulfuric acid, 10g of sodium nitrate (the function of sodium nitrate is an oxidation aid and can be omitted), 60g of potassium permanganate and 10g of graphite into the reactor in sequence, stir at room temperature, and add 80°C hot water dropwise to the reactor at a constant speed In the process, after the heat release is complete, hydrogen peroxide is added until no more bubbles are generated, and the reaction is terminated; the ball milling method is used for peeling at 250 rpm for 5 hours, and the solution is centrifugally washed until the solution is neutral to obtain a graphene oxide-like dispersion. Heat the graphene oxide-like dispersion to 80°C with stirring, and adjust the pH with 1:1 hydrochloric acid (1 volume part of concentrated hydrochloric acid (about 37%-38%) mixed with 1 volume part of water, the same below) The value is 1.5, add 2mol / L TiOCl dropwise 2 The aqueous solution is added dropwise with NaOH solution at the same time...

Embodiment 2

[0039] Add 500ml of concentrated sulfuric acid, 10g of sodium nitrate, 60g of potassium permanganate and 10g of graphite to the reactor in sequence, stir at room temperature, add 80°C hot water dropwise into the reactor at a constant speed, and after the heat release is complete, add hydrogen peroxide until no more Bubbles are generated, and the reaction is terminated; 500W power ultrasonic method is used to peel off for 1 hour, and centrifuge and wash until the solution is neutral to obtain a graphene oxide-like dispersion. Heat the graphene oxide-like dispersion to 80°C with stirring, adjust the pH to 1.5 with 1:1 hydrochloric acid, and add 2mol / L TiOCl dropwise 2 The aqueous solution is added dropwise with NaOH solution at the same time to stabilize the pH value at 1.5. After the dropwise addition is completed, continue heating and stirring, filter, wash, and calcinate to obtain a pearlescent pigment based on graphite oxide. The particle size distribution of graphene oxide-...

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Abstract

The invention relates to quasi graphene oxide, quasi graphene and a quasi-graphene-based pearlescent pigment based on the quasi graphene oxide or quasi graphene. The quasi graphene oxide is obtained from the following steps: (A) oxidizing flake graphite powder with potassium permanganate; (B) intercalating concentrated sulfuric acid to oxidized graphite powder; and (C) peeling intercalated graphite powder, washing the obtained product till the product is neutral, and performing filtration and drying. Quasi graphene is prepared by reducing quasi graphene oxide. The quasi-graphene-based pearlescent pigment based on the quasi graphene oxide or quasi graphene is high in covering power and chroma and pure in tone, is controllable in technology, and can be widely applied to cosmetics, synthetic leather, plastics, textile and garment or paint.

Description

technical field [0001] The invention belongs to the field of preparation of pearlescent pigments, in particular to a graphene-like oxide, graphene-like and pearlescent pigments based thereon, and further relates to their preparation methods. Background technique [0002] In recent years, synthetic mica-based pearlescent pigments have gradually been widely used due to their high whiteness (silver white series), bright colors (iridescent and metallic color series), no harmful trace elements, high temperature resistance, and no radioactivity. Especially the large particle size synthetic mica pearlescent pigment with a particle size of 50-1000 μm has a super strong shimmering feeling and has a special decorative effect. In this large particle size range, the inevitable variegated flakes of natural mica seriously affect the quality of mica-based pearlescent pigments; pearlescent pigments based on glass phosphor flakes are limited by their fragility and skin irritation. the scope...

Claims

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Application Information

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IPC IPC(8): C09C1/46C01B32/198C01B32/192C09D5/36C09D167/00C08K3/04C08L23/12A61K8/19A61Q1/00
CPCA61K8/19A61K2800/436A61Q1/00C01B2204/32C01P2004/64C01P2006/65C01P2006/66C08K3/04C08L23/12C09C1/0078C09D5/36C09D167/00
Inventor 谢秉昆张易宁曹志成刘永川张祥昕陈继威陈素晶苗小飞
Owner FUJIAN KUNCAI MATERIAL TECH
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