A method for buffer system to control the viscosity of iron oxide yellow

A technology of iron oxide yellow and buffer system, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, fibrous filler, etc. It can solve the problems of high fluidity resistance of paint, change of pigment hue, and large energy consumption, etc., and reach the particle surface Smooth, reduced aspect ratio, uniform growth effect

Active Publication Date: 2021-12-21
ZHEJIANG HUAYUAN PIGMENT CO LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high solid content and low VOC is an important development target of the coating industry, and the viscosity of the pigment determines the size of the solid content. Excessively high pigment viscosity leads to high flow resistance of the coating, which is extremely unfavorable to production.
[0006] At present, relevant literature reports at home and abroad show that the viscosity of iron oxide yellow can be improved by changing the surface charge of iron oxide yellow particles or reducing the aspect ratio of iron oxide yellow particles. In China, there is a patent with application number 201410767118.7 published by Zhejiang United Pigment "A low-viscosity iron oxide yellow pigment", the principle is to destroy the shape of some iron oxide yellow pigment particles by grinding with steel balls, but not reduce the aspect ratio of all iron oxide yellow particles as a whole. Although this method reduces the particle size to a certain extent The viscosity of the pigment is reduced, but the effect is not obvious enough and the hue of the pigment will change; Nantong Baoju Pigment Co., Ltd. published the patent No. ZL201310277999. The charge on the surface of yellow particles is used to improve the viscosity of iron oxide yellow, the effect is ideal, but there is still room for improvement; Zhejiang Huayuan Pigment's published application number ZL201610596145.1 patent "a low-viscosity iron oxide yellow" through high-pressure reaction and Controlling the temperature of the system to reduce the viscosity of iron oxide yellow has a certain effect, but the high-pressure reaction is dangerous and consumes a lot of energy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for buffer system to control the viscosity of iron oxide yellow
  • A method for buffer system to control the viscosity of iron oxide yellow
  • A method for buffer system to control the viscosity of iron oxide yellow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Seed crystal production:

[0035] A: Raw material configuration: 50m 3 Add ferrous sulfate solution with a concentration of 1.5mol / L into the stainless steel reaction barrel, and then add a volume of 7m 3 Sodium hydroxide solution with a concentration of 2.5mol / L, while controlling the reaction temperature at 25-35°C;

[0036] B: Air volume control: Control the total reaction time to 14-17h, and pass air to the bottom of the reaction solution in the first 5-7 hours, and the air volume is controlled at 230m 3 / h, after 7-10h, the air volume is controlled at 460m 3 / h. The final material of the reaction is stored separately as a seed crystal;

[0037] 2) Add buffer system for oxidation:

[0038] A: Put the prepared seed crystals into the reaction barrel, then add a certain amount of water to dilute, and control the ferrous iron content between 1.34mol / L and 1.52mol / L;

[0039] B: For the six groups of reaction barrels, the feed liquid is fed into the air from the...

Embodiment 2

[0045] 1) Seed crystal production:

[0046] A: Raw material configuration: 50m 3 Add ferrous sulfate solution with a concentration of 1.5mol / L into the stainless steel reaction barrel, and then add a volume of 7m 3 Sodium hydroxide solution with a concentration of 2.5mol / L, while controlling the reaction temperature at 25-35°C;

[0047] B: Air volume control: Control the total reaction time to 14-17h, and pass air to the bottom of the reaction solution in the first 5-7 hours, and the air volume is controlled at 230m 3 / h, after 7-10h, the air volume is controlled at 460m 3 / h. The final material of the reaction is stored separately as a seed crystal;

[0048] 2) Add buffer system for oxidation:

[0049] A: Put the prepared seed crystals into the reaction barrel, then add a certain amount of water to dilute, and control the ferrous iron content between 1.34mol / L and 1.52mol / L;

[0050] B: For the six groups of reaction barrels, the feed liquid is fed into the air from the b...

Embodiment 3

[0056] 1) Seed crystal production:

[0057] A: Raw material configuration: 50m 3 Add ferrous sulfate solution with a concentration of 1.5mol / L into the stainless steel reaction barrel, and then add a volume of 7m 3 Sodium hydroxide solution with a concentration of 2.5mol / L, while controlling the reaction temperature at 25-35°C;

[0058] B: Air volume control: Control the total reaction time to 14-17h, and pass air to the bottom of the reaction solution in the first 5-7 hours, and the air volume is controlled at 230m 3 / h, after 7-10h, the air volume is controlled at 460m 3 / h. The final material of the reaction is stored separately as a seed crystal;

[0059] 2) Add buffer system for oxidation:

[0060] A: Put the prepared seed crystals into the reaction barrel, then add a certain amount of water to dilute, and control the ferrous iron content between 1.34mol / L and 1.52mol / L;

[0061] B: For the six groups of reaction barrels, the feed liquid is fed into the air from the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a new method for the production of low-viscosity iron oxide yellow in a buffer system, which uses crystal seeds to oxidize in the buffer system, and stabilizes the pH condition without violent pH changes due to the impact of ferrous sulfate and liquid caustic soda. Let the seed crystals grow under certain conditions. On the one hand, it can make the iron yellow particles grow more uniformly. On the other hand, the iron yellow particles grown in a relatively stable pH environment are not easy to produce bifurcations, the surface of the particles is smoother, the aspect ratio is reduced, and its viscosity As low as 36Ku.

Description

technical field [0001] The invention relates to a low-viscosity iron oxide yellow pigment, in particular to preparing low-viscosity iron oxide yellow in a buffer system by controlling the reaction. Background technique [0002] Iron oxide yellow, also known as iron oxyhydroxide, its molecular formula is FeOOH or Fe2O3·H2O, it is yellow powder, its particle shape is needle-like, it has high coloring power, hiding power, and it is non-toxic and harmless, and is environmentally friendly Type inorganic pigment, its light fastness reaches 6-7 level. Iron oxide yellow pigments are widely used in building materials, coatings, paints, plastics, rubber, electronics, industrial catalysts, tobacco, cosmetics and other industries. [0003] Due to the difference in surface charge distribution and particle shape, ordinary iron oxide yellow has high viscosity and has many limitations in the application field of coatings. Compared with other axial crystal systems such as iron oxide red is...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06C09C1/24
CPCC01G49/06C09C1/24C01P2006/22
Inventor 沈辉李金花钱晓晖倪钟伟
Owner ZHEJIANG HUAYUAN PIGMENT CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap